1 Version 1.67.0 (2023-01-26)
2 ==========================
4 <a id="1.67.0-Language"></a>
9 - [Make `Sized` predicates coinductive, allowing cycles.](https://github.com/rust-lang/rust/pull/100386/)
10 - [`#[must_use]` annotations on `async fn` also affect the `Future::Output`.](https://github.com/rust-lang/rust/pull/100633/)
11 - [Elaborate supertrait obligations when deducing closure signatures.](https://github.com/rust-lang/rust/pull/101834/)
12 - [Invalid literals are no longer an error under `cfg(FALSE)`.](https://github.com/rust-lang/rust/pull/102944/)
13 - [Unreserve braced enum variants in value namespace.](https://github.com/rust-lang/rust/pull/103578/)
15 <a id="1.67.0-Compiler"></a>
20 - [Enable varargs support for calling conventions other than `C` or `cdecl`.](https://github.com/rust-lang/rust/pull/97971/)
21 - [Add new MIR constant propagation based on dataflow analysis.](https://github.com/rust-lang/rust/pull/101168/)
22 - [Optimize field ordering by grouping m\*2^n-sized fields with equivalently aligned ones.](https://github.com/rust-lang/rust/pull/102750/)
23 - [Stabilize native library modifier `verbatim`.](https://github.com/rust-lang/rust/pull/104360/)
25 Added and removed targets:
27 - [Add a tier 3 target for PowerPC on AIX](https://github.com/rust-lang/rust/pull/102293/), `powerpc64-ibm-aix`.
28 - [Add a tier 3 target for the Sony PlayStation 1](https://github.com/rust-lang/rust/pull/102689/), `mipsel-sony-psx`.
29 - [Add tier 3 `no_std` targets for the QNX Neutrino RTOS](https://github.com/rust-lang/rust/pull/102701/),
30 `aarch64-unknown-nto-qnx710` and `x86_64-pc-nto-qnx710`.
31 - [Remove tier 3 `linuxkernel` targets](https://github.com/rust-lang/rust/pull/104015/) (not used by the actual kernel).
33 Refer to Rust's [platform support page][platform-support-doc]
34 for more information on Rust's tiered platform support.
36 <a id="1.67.0-Libraries"></a>
41 - [Merge `crossbeam-channel` into `std::sync::mpsc`.](https://github.com/rust-lang/rust/pull/93563/)
42 - [Fix inconsistent rounding of 0.5 when formatted to 0 decimal places.](https://github.com/rust-lang/rust/pull/102935/)
43 - [Derive `Eq` and `Hash` for `ControlFlow`.](https://github.com/rust-lang/rust/pull/103084/)
44 - [Don't build `compiler_builtins` with `-C panic=abort`.](https://github.com/rust-lang/rust/pull/103786/)
46 <a id="1.67.0-Stabilized-APIs"></a>
51 - [`{integer}::checked_ilog`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog)
52 - [`{integer}::checked_ilog2`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog2)
53 - [`{integer}::checked_ilog10`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog10)
54 - [`{integer}::ilog`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog)
55 - [`{integer}::ilog2`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog2)
56 - [`{integer}::ilog10`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog10)
57 - [`NonZeroU*::ilog2`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog2)
58 - [`NonZeroU*::ilog10`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog10)
59 - [`NonZero*::BITS`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#associatedconstant.BITS)
61 These APIs are now stable in const contexts:
63 - [`char::from_u32`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_u32)
64 - [`char::from_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_digit)
65 - [`char::to_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_digit)
66 - [`core::char::from_u32`](https://doc.rust-lang.org/stable/core/char/fn.from_u32.html)
67 - [`core::char::from_digit`](https://doc.rust-lang.org/stable/core/char/fn.from_digit.html)
69 <a id="1.67.0-Compatibility-Notes"></a>
74 - [The layout of `repr(Rust)` types now groups m\*2^n-sized fields with
75 equivalently aligned ones.](https://github.com/rust-lang/rust/pull/102750/)
76 This is intended to be an optimization, but it is also known to increase type
77 sizes in a few cases for the placement of enum tags. As a reminder, the layout
78 of `repr(Rust)` types is an implementation detail, subject to change.
79 - [0.5 now rounds to 0 when formatted to 0 decimal places.](https://github.com/rust-lang/rust/pull/102935/)
80 This makes it consistent with the rest of floating point formatting that
81 rounds ties toward even digits.
82 - [Chains of `&&` and `||` will now drop temporaries from their sub-expressions in
83 evaluation order, left-to-right.](https://github.com/rust-lang/rust/pull/103293/)
84 Previously, it was "twisted" such that the _first_ expression dropped its
85 temporaries _last_, after all of the other expressions dropped in order.
86 - [Underscore suffixes on string literals are now a hard error.](https://github.com/rust-lang/rust/pull/103914/)
87 This has been a future-compatibility warning since 1.20.0.
88 - [Stop passing `-export-dynamic` to `wasm-ld`.](https://github.com/rust-lang/rust/pull/105405/)
89 - [`main` is now mangled as `__main_void` on `wasm32-wasi`.](https://github.com/rust-lang/rust/pull/105468/)
90 - [Cargo now emits an error if there are multiple registries in the configuration
91 with the same index URL.](https://github.com/rust-lang/cargo/pull/10592)
93 <a id="1.67.0-Internal-Changes"></a>
98 These changes do not affect any public interfaces of Rust, but they represent
99 significant improvements to the performance or internals of rustc and related
102 - [Rewrite LLVM's archive writer in Rust.](https://github.com/rust-lang/rust/pull/97485/)
104 Version 1.66.1 (2023-01-10)
105 ===========================
107 - Added validation of SSH host keys for git URLs in Cargo ([CVE-2022-46176](https://www.cve.org/CVERecord?id=CVE-2022-46176))
109 Version 1.66.0 (2022-12-15)
110 ==========================
114 - [Permit specifying explicit discriminants on all `repr(Int)` enums](https://github.com/rust-lang/rust/pull/95710/)
123 - [Allow transmutes between the same type differing only in lifetimes](https://github.com/rust-lang/rust/pull/101520/)
124 - [Change constant evaluation errors from a deny-by-default lint to a hard error](https://github.com/rust-lang/rust/pull/102091/)
125 - [Trigger `must_use` on `impl Trait` for supertraits](https://github.com/rust-lang/rust/pull/102287/)
126 This makes `impl ExactSizeIterator` respect the existing `#[must_use]` annotation on `Iterator`.
127 - [Allow `..=X` in patterns](https://github.com/rust-lang/rust/pull/102275/)
128 - [Uplift `clippy::for_loops_over_fallibles` lint into rustc](https://github.com/rust-lang/rust/pull/99696/)
129 - [Stabilize `sym` operands in inline assembly](https://github.com/rust-lang/rust/pull/103168/)
130 - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101912/)
131 - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
132 This is a soundness fix which may break code that was erroneously relying on this behavior.
136 - [Add armv5te-none-eabi and thumbv5te-none-eabi tier 3 targets](https://github.com/rust-lang/rust/pull/101329/)
137 - Refer to Rust's [platform support page][platform-support-doc] for more
138 information on Rust's tiered platform support.
139 - [Add support for linking against macOS universal libraries](https://github.com/rust-lang/rust/pull/98736)
143 - [Fix `#[derive(Default)]` on a generic `#[default]` enum adding unnecessary `Default` bounds](https://github.com/rust-lang/rust/pull/101040/)
144 - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101821/)
149 - [`proc_macro::Span::source_text`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.source_text)
150 - [`uX::{checked_add_signed, overflowing_add_signed, saturating_add_signed, wrapping_add_signed}`](https://doc.rust-lang.org/stable/std/primitive.u8.html#method.checked_add_signed)
151 - [`iX::{checked_add_unsigned, overflowing_add_unsigned, saturating_add_unsigned, wrapping_add_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_add_unsigned)
152 - [`iX::{checked_sub_unsigned, overflowing_sub_unsigned, saturating_sub_unsigned, wrapping_sub_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_sub_unsigned)
153 - [`BTreeSet::{first, last, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.first)
154 - [`BTreeMap::{first_key_value, last_key_value, first_entry, last_entry, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.first_key_value)
155 - [Add `AsFd` implementations for stdio lock types on WASI.](https://github.com/rust-lang/rust/pull/101768/)
156 - [`impl TryFrom<Vec<T>> for Box<[T; N]>`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#impl-TryFrom%3CVec%3CT%2C%20Global%3E%3E-for-Box%3C%5BT%3B%20N%5D%2C%20Global%3E)
157 - [`core::hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
158 - [`Duration::try_from_secs_{f32,f64}`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.try_from_secs_f32)
159 - [`Option::unzip`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unzip)
160 - [`std::os::fd`](https://doc.rust-lang.org/stable/std/os/fd/index.html)
166 - [Add Rustdoc warning for invalid HTML tags in the documentation](https://github.com/rust-lang/rust/pull/101720/)
171 - [Added `cargo remove` to remove dependencies from Cargo.toml](https://doc.rust-lang.org/nightly/cargo/commands/cargo-remove.html)
172 - [`cargo publish` now waits for the new version to be downloadable before exiting](https://github.com/rust-lang/cargo/pull/11062)
174 See [detailed release notes](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-166-2022-12-15) for more.
179 - [Only apply `ProceduralMasquerade` hack to older versions of `rental`](https://github.com/rust-lang/rust/pull/94063/)
180 - [Don't export `__heap_base` and `__data_end` on wasm32-wasi.](https://github.com/rust-lang/rust/pull/102385/)
181 - [Don't export `__wasm_init_memory` on WebAssembly.](https://github.com/rust-lang/rust/pull/102426/)
182 - [Only export `__tls_*` on wasm32-unknown-unknown.](https://github.com/rust-lang/rust/pull/102440/)
183 - [Don't link to `libresolv` in libstd on Darwin](https://github.com/rust-lang/rust/pull/102766/)
184 - [Update libstd's libc to 0.2.135 (to make `libstd` no longer pull in `libiconv.dylib` on Darwin)](https://github.com/rust-lang/rust/pull/103277/)
185 - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
186 This is a soundness fix which may break code that was erroneously relying on this behavior.
187 - [Make `order_dependent_trait_objects` show up in future-breakage reports](https://github.com/rust-lang/rust/pull/102635/)
188 - [Change std::process::Command spawning to default to inheriting the parent's signal mask](https://github.com/rust-lang/rust/pull/101077/)
193 These changes do not affect any public interfaces of Rust, but they represent
194 significant improvements to the performance or internals of rustc and related
197 - [Enable BOLT for LLVM compilation](https://github.com/rust-lang/rust/pull/94381/)
198 - [Enable LTO for rustc_driver.so](https://github.com/rust-lang/rust/pull/101403/)
200 Version 1.65.0 (2022-11-03)
201 ==========================
205 - [Error on `as` casts of enums with `#[non_exhaustive]` variants](https://github.com/rust-lang/rust/pull/92744/)
206 - [Stabilize `let else`](https://github.com/rust-lang/rust/pull/93628/)
207 - [Stabilize generic associated types (GATs)](https://github.com/rust-lang/rust/pull/96709/)
208 - [Add lints `let_underscore_drop` and `let_underscore_lock` from Clippy](https://github.com/rust-lang/rust/pull/97739/)
209 - [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")](https://github.com/rust-lang/rust/pull/99332/)
210 - [Uninitialized integers, floats, and raw pointers are now considered immediate UB](https://github.com/rust-lang/rust/pull/98919/).
211 Usage of `MaybeUninit` is the correct way to work with uninitialized memory.
212 - [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a](https://github.com/rust-lang/rust/pull/99916/)
213 - [Do not allow `Drop` impl on foreign ADTs](https://github.com/rust-lang/rust/pull/99576/)
217 - [Stabilize -Csplit-debuginfo on Linux](https://github.com/rust-lang/rust/pull/98051/)
218 - [Use niche-filling optimization even when multiple variants have data](https://github.com/rust-lang/rust/pull/94075/)
219 - [Associated type projections are now verified to be well-formed prior to resolving the underlying type](https://github.com/rust-lang/rust/pull/99217/#issuecomment-1209365630)
220 - [Stringify non-shorthand visibility correctly](https://github.com/rust-lang/rust/pull/100350/)
221 - [Normalize struct field types when unsizing](https://github.com/rust-lang/rust/pull/101831/)
222 - [Update to LLVM 15](https://github.com/rust-lang/rust/pull/99464/)
223 - [Fix aarch64 call abi to correctly zeroext when needed](https://github.com/rust-lang/rust/pull/97800/)
224 - [debuginfo: Generalize C++-like encoding for enums](https://github.com/rust-lang/rust/pull/98393/)
225 - [Add `special_module_name` lint](https://github.com/rust-lang/rust/pull/94467/)
226 - [Add support for generating unique profraw files by default when using `-C instrument-coverage`](https://github.com/rust-lang/rust/pull/100384/)
227 - [Allow dynamic linking for iOS/tvOS targets](https://github.com/rust-lang/rust/pull/100636/)
231 - [Add armv4t-none-eabi as a tier 3 target](https://github.com/rust-lang/rust/pull/100244/)
232 - [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets](https://github.com/rust-lang/rust/pull/101025/)
233 - Refer to Rust's [platform support page][platform-support-doc] for more
234 information on Rust's tiered platform support.
239 - [Don't generate `PartialEq::ne` in derive(PartialEq)](https://github.com/rust-lang/rust/pull/98655/)
240 - [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default](https://github.com/rust-lang/rust/pull/101325/)
241 - [Forbid mixing `System` with direct system allocator calls](https://github.com/rust-lang/rust/pull/101394/)
242 - [Document no support for writing to non-blocking stdio/stderr](https://github.com/rust-lang/rust/pull/101416/)
243 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295)
244 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
249 - [`std::backtrace::Backtrace`](https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html)
250 - [`Bound::as_ref`](https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref)
251 - [`std::io::read_to_string`](https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html)
252 - [`<*const T>::cast_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut)
253 - [`<*mut T>::cast_const`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const)
255 These APIs are now stable in const contexts:
257 - [`<*const T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
258 - [`<*mut T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
263 - [Apply GitHub fast path even for partial hashes](https://github.com/rust-lang/cargo/pull/10807/)
264 - [Do not add home bin path to PATH if it's already there](https://github.com/rust-lang/cargo/pull/11023/)
265 - [Take priority into account within the pending queue](https://github.com/rust-lang/cargo/pull/11032/).
266 This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds.
271 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295).
272 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
273 - [`PollFn` now only implements `Unpin` if the closure is `Unpin`](https://github.com/rust-lang/rust/pull/102737).
274 This is a possible breaking change if users were relying on the blanket unpin implementation.
275 See discussion on the PR for details of why this change was made.
276 - [Drop ExactSizeIterator impl from std::char::EscapeAscii](https://github.com/rust-lang/rust/pull/99880)
277 This is a backwards-incompatible change to the standard library's surface
278 area, but is unlikely to affect real world usage.
279 - [Do not consider a single repeated lifetime eligible for elision in the return type](https://github.com/rust-lang/rust/pull/103450)
280 This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again.
281 - [Reenable disabled early syntax gates as future-incompatibility lints](https://github.com/rust-lang/rust/pull/99935/)
282 - [Update the minimum external LLVM to 13](https://github.com/rust-lang/rust/pull/100460/)
283 - [Don't duplicate file descriptors into stdio fds](https://github.com/rust-lang/rust/pull/101426/)
284 - [Sunset RLS](https://github.com/rust-lang/rust/pull/100863/)
285 - [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type](https://github.com/rust-lang/rust/pull/99784/)
286 This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny.
287 - [`llvm-has-rust-patches` allows setting the build system to treat the LLVM as having Rust-specific patches](https://github.com/rust-lang/rust/pull/101072)
288 This option may need to be set for distributions that are building Rust with a patched LLVM via `llvm-config`, not the built-in LLVM.
289 - Combining three or more languages (e.g. Objective C, C++ and Rust) into one binary may hit linker limitations when using `lld`. For more information, see [issue 102754][102754].
291 [102754]: https://github.com/rust-lang/rust/issues/102754
296 These changes do not affect any public interfaces of Rust, but they represent
297 significant improvements to the performance or internals of rustc and related
300 - [Add `x.sh` and `x.ps1` shell scripts](https://github.com/rust-lang/rust/pull/99992/)
301 - [compiletest: use target cfg instead of hard-coded tables](https://github.com/rust-lang/rust/pull/100260/)
302 - [Use object instead of LLVM for reading bitcode from rlibs](https://github.com/rust-lang/rust/pull/98100/)
303 - [Enable MIR inlining for optimized compilations](https://github.com/rust-lang/rust/pull/91743)
304 This provides a 3-10% improvement in compiletimes for real world crates. See [perf results](https://perf.rust-lang.org/compare.html?start=aedf78e56b2279cc869962feac5153b6ba7001ed&end=0075bb4fad68e64b6d1be06bf2db366c30bc75e1&stat=instructions:u).
306 Version 1.64.0 (2022-09-22)
307 ===========================
311 - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
312 - It is now considered valid to deallocate memory pointed to by a shared reference `&T` [if every byte in `T` is inside an `UnsafeCell`](https://github.com/rust-lang/rust/pull/98017/)
313 - Unused tuple struct fields are now warned against in an allow-by-default lint, [`unused_tuple_struct_fields`](https://github.com/rust-lang/rust/pull/95977/), similar to the existing warning for unused struct fields. This lint will become warn-by-default in the future.
317 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
318 - Refer to Rust's [platform support page][platform-support-doc] for more
319 information on Rust's tiered platform support.
320 - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
321 - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
322 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
326 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
327 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
328 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
329 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
330 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
331 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
332 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
333 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
338 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
339 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
340 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
341 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
342 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
343 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
344 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
345 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
346 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
347 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
348 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
349 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
350 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
351 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
352 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
353 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
354 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
355 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
356 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
358 These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
360 - [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
361 - [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
362 - [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
363 - [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
364 - [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
365 - [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
367 These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
369 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
370 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
371 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
372 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
373 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
374 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
375 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
376 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
377 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
378 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
379 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
380 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
381 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
383 These APIs are now usable in const contexts:
385 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
389 - [Packages can now inherit settings from the workspace so that the settings
390 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
391 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
393 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
394 for more details on how to define these common settings.
395 - [Cargo commands can now accept multiple `--target` flags to build for
396 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
397 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
398 config option may now take an array of multiple targets.
399 - [The `--jobs` argument can now take a negative number to count backwards from
400 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
401 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
402 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
403 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
404 flag to `cargo rustc` to override the crate type.
405 - [Significantly improved the performance fetching git dependencies from GitHub
406 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
410 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
414 - The minimum required versions for all `-linux-gnu` targets are now at least kernel 3.2 and glibc 2.17, for targets that previously supported older versions: [Increase the minimum linux-gnu versions](https://github.com/rust-lang/rust/pull/95026/)
415 - [Network primitives are now implemented with the ideal Rust layout, not the C system layout](https://github.com/rust-lang/rust/pull/78802/). This can cause problems when transmuting the types.
416 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
417 - [A soundness bug in `BTreeMap` was fixed](https://github.com/rust-lang/rust/pull/99413/) that allowed data it was borrowing to be dropped before the container.
418 - [The Drop behavior of C-like enums cast to ints has changed](https://github.com/rust-lang/rust/pull/96862/). These are already discouraged by a compiler warning.
419 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
420 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
421 - On the `thumbv6m-none-eabi` target, some incorrect `asm!` statements were erroneously accepted if they used the high registers (r8 to r14) as an input/output operand. [This is no longer accepted](https://github.com/rust-lang/rust/pull/99155/).
422 - [`impl Trait` was accidentally accepted as the associated type value of return-position `impl Trait`](https://github.com/rust-lang/rust/pull/97346/), without fulfilling all the trait bounds of that associated type, as long as the hidden type satisfies said bounds. This has been fixed.
427 These changes do not affect any public interfaces of Rust, but they represent
428 significant improvements to the performance or internals of rustc and related
431 - Windows builds now use profile-guided optimization, providing 10-20% improvements to compiler performance: [Utilize PGO for windows x64 rustc dist builds](https://github.com/rust-lang/rust/pull/96978/)
432 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
433 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
434 - Many improvements to generated code for derives, including performance improvements:
435 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
436 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
437 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
438 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
439 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
440 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
441 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
442 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
443 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
444 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
445 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
447 Version 1.63.0 (2022-08-11)
448 ==========================
452 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
453 - [Modify MIR building to drop repeat expressions with length zero.][95953]
454 - [Remove label/lifetime shadowing warnings.][96296]
455 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
456 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
457 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
458 - [lub: don't bail out due to empty binders.][97867]
462 - [Stabilize the `bundle` native library modifier,][95818] also removing the
463 deprecated `static-nobundle` linking kind.
464 - [Add Apple WatchOS compile targets\*.][95243]
465 - [Add a Windows application manifest to rustc-main.][96737]
467 \* Refer to Rust's [platform support page][platform-support-doc] for more
468 information on Rust's tiered platform support.
472 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
473 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
474 - [`impl Read and Write for VecDeque<u8>`.][95632]
475 - [STD support for the Nintendo 3DS.][95897]
476 - [Use rounding in float to Duration conversion methods.][96051]
477 - [Make write/print macros eagerly drop temporaries.][96455]
478 - [Implement internal traits that enable `[OsStr]::join`.][96881]
479 - [Implement `Hash` for `core::alloc::Layout`.][97034]
480 - [Add capacity documentation for `OsString`.][97202]
481 - [Put a bound on collection misbehavior.][97316]
482 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
483 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
484 - [Document Rust's stance on `/proc/self/mem`.][97837]
491 - [`BinaryHeap::try_reserve`]
492 - [`BinaryHeap::try_reserve_exact`]
493 - [`OsString::try_reserve`]
494 - [`OsString::try_reserve_exact`]
495 - [`PathBuf::try_reserve`]
496 - [`PathBuf::try_reserve_exact`]
497 - [`Path::try_exists`]
498 - [`Ref::filter_map`]
499 - [`RefMut::filter_map`]
500 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
501 - [`ToOwned::clone_into`]
502 - [`Ipv6Addr::to_ipv4_mapped`]
504 - [`unix::io::BorrowedFd<'fd>`]
505 - [`unix::io::OwnedFd`]
506 - [`windows::io::AsHandle`]
507 - [`windows::io::BorrowedHandle<'handle>`]
508 - [`windows::io::OwnedHandle`]
509 - [`windows::io::HandleOrInvalid`]
510 - [`windows::io::HandleOrNull`]
511 - [`windows::io::InvalidHandleError`]
512 - [`windows::io::NullHandleError`]
513 - [`windows::io::AsSocket`]
514 - [`windows::io::BorrowedSocket<'handle>`]
515 - [`windows::io::OwnedSocket`]
518 - [`thread::ScopedJoinHandle`]
520 These APIs are now usable in const contexts:
522 - [`array::from_ref`]
523 - [`slice::from_ref`]
524 - [`intrinsics::copy`]
525 - [`intrinsics::copy_nonoverlapping`]
526 - [`<*const T>::copy_to`]
527 - [`<*const T>::copy_to_nonoverlapping`]
528 - [`<*mut T>::copy_to`]
529 - [`<*mut T>::copy_to_nonoverlapping`]
530 - [`<*mut T>::copy_from`]
531 - [`<*mut T>::copy_from_nonoverlapping`]
533 - [`Utf8Error::error_len`]
534 - [`Utf8Error::valid_up_to`]
541 - [Stabilize the `--config path` command-line argument.][cargo/10755]
542 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
547 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
548 errors for invalid attribute arguments that were previously ignored.
549 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
550 duration can differ slightly from what it was.
555 These changes provide no direct user facing benefits, but represent significant
556 improvements to the internals and overall performance of rustc
559 - [Prepare Rust for LLVM opaque pointers.][94214]
561 [94214]: https://github.com/rust-lang/rust/pull/94214/
562 [94530]: https://github.com/rust-lang/rust/pull/94530/
563 [94954]: https://github.com/rust-lang/rust/pull/94954/
564 [95243]: https://github.com/rust-lang/rust/pull/95243/
565 [95565]: https://github.com/rust-lang/rust/pull/95565/
566 [95632]: https://github.com/rust-lang/rust/pull/95632/
567 [95818]: https://github.com/rust-lang/rust/pull/95818/
568 [95897]: https://github.com/rust-lang/rust/pull/95897/
569 [95953]: https://github.com/rust-lang/rust/pull/95953/
570 [96051]: https://github.com/rust-lang/rust/pull/96051/
571 [96296]: https://github.com/rust-lang/rust/pull/96296/
572 [96455]: https://github.com/rust-lang/rust/pull/96455/
573 [96737]: https://github.com/rust-lang/rust/pull/96737/
574 [96868]: https://github.com/rust-lang/rust/pull/96868/
575 [96881]: https://github.com/rust-lang/rust/pull/96881/
576 [96885]: https://github.com/rust-lang/rust/pull/96885/
577 [96959]: https://github.com/rust-lang/rust/pull/96959/
578 [97034]: https://github.com/rust-lang/rust/pull/97034/
579 [97202]: https://github.com/rust-lang/rust/pull/97202/
580 [97316]: https://github.com/rust-lang/rust/pull/97316/
581 [97652]: https://github.com/rust-lang/rust/pull/97652/
582 [97675]: https://github.com/rust-lang/rust/pull/97675/
583 [97803]: https://github.com/rust-lang/rust/pull/97803/
584 [97837]: https://github.com/rust-lang/rust/pull/97837/
585 [97867]: https://github.com/rust-lang/rust/pull/97867/
586 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
587 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
589 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
590 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
591 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
592 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
593 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
594 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
595 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
596 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
597 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
598 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
599 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
600 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
601 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
602 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
603 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
604 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
605 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
606 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
607 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
608 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
609 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
610 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
611 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
612 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
613 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
614 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
615 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
616 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
617 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
618 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
620 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
621 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
622 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
623 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
624 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
625 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
626 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
627 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
628 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
629 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
630 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
631 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
632 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
633 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
634 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
635 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
637 Version 1.62.1 (2022-07-19)
638 ==========================
640 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
641 library, and also mitigates a CPU vulnerability on Intel SGX.
643 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
644 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
645 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
646 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
647 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
649 [98608]: https://github.com/rust-lang/rust/issues/98608
650 [98890]: https://github.com/rust-lang/rust/issues/98890
651 [98950]: https://github.com/rust-lang/rust/pull/98950
652 [98126]: https://github.com/rust-lang/rust/pull/98126
653 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
655 Version 1.62.0 (2022-06-30)
656 ==========================
661 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
662 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
663 - [Fix constants not getting dropped if part of a diverging expression][94775]
664 - [Support unit struct/enum variant in destructuring assignment][95380]
665 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
666 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
671 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
672 - [Make `unaligned_references` lint deny-by-default][95372]
673 This lint is also a future compatibility lint, and is expected to eventually
675 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
676 - [Reject `#[thread_local]` attribute on non-static items][95006]
677 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
678 - [Implement a lint to warn about unused macro rules][96150]
679 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
681 \* Refer to Rust's [platform support page][platform-support-doc] for more
682 information on Rust's tiered platform support.
687 - [Windows: Use a pipe relay for chaining pipes][95841]
688 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
689 - [Replace RwLock by a futex based one on Linux][95801]
690 - [std: directly use pthread in UNIX parker implementation][96393]
695 - [`bool::then_some`]
699 - [`windows::CommandExt::raw_arg`]
700 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
701 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
702 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
703 - [`FusedIterator for EncodeWide`]
704 - [RDM intrinsics on aarch64][stdarch/1285]
709 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
714 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
716 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
717 - Package ID specs now support `name@version` syntax in addition to the
718 previous `name:version` to align with the behavior in `cargo add` and other
719 tools. `cargo install` and `cargo yank` also now support this syntax so the
720 version does not need to passed as a separate flag.
721 - The `git` and `registry` directories in Cargo's home directory (usually
722 `~/.cargo`) are now marked as cache directories so that they are not
723 included in backups or content indexing (on Windows).
724 - Added automatic `@` argfile support, which will use "response files" if the
725 command-line to `rustc` exceeds the operating system's limit.
730 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
731 the same as the host target.
732 [#10594](https://github.com/rust-lang/cargo/pull/10594)
733 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
734 - [rustdoc: Remove .woff font files][96279]
735 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
736 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
737 complete synchronously][95469].
742 - [Unify ReentrantMutex implementations across all platforms][96042]
744 These changes provide no direct user facing benefits, but represent significant
745 improvements to the internals and overall performance of rustc
748 [93313]: https://github.com/rust-lang/rust/pull/93313/
749 [93969]: https://github.com/rust-lang/rust/pull/93969/
750 [94206]: https://github.com/rust-lang/rust/pull/94206/
751 [94457]: https://github.com/rust-lang/rust/pull/94457/
752 [94775]: https://github.com/rust-lang/rust/pull/94775/
753 [94872]: https://github.com/rust-lang/rust/pull/94872/
754 [95006]: https://github.com/rust-lang/rust/pull/95006/
755 [95035]: https://github.com/rust-lang/rust/pull/95035/
756 [95346]: https://github.com/rust-lang/rust/pull/95346/
757 [95372]: https://github.com/rust-lang/rust/pull/95372/
758 [95380]: https://github.com/rust-lang/rust/pull/95380/
759 [95431]: https://github.com/rust-lang/rust/pull/95431/
760 [95469]: https://github.com/rust-lang/rust/pull/95469/
761 [95705]: https://github.com/rust-lang/rust/pull/95705/
762 [95801]: https://github.com/rust-lang/rust/pull/95801/
763 [95819]: https://github.com/rust-lang/rust/pull/95819/
764 [95841]: https://github.com/rust-lang/rust/pull/95841/
765 [96042]: https://github.com/rust-lang/rust/pull/96042/
766 [96150]: https://github.com/rust-lang/rust/pull/96150/
767 [96268]: https://github.com/rust-lang/rust/pull/96268/
768 [96279]: https://github.com/rust-lang/rust/pull/96279/
769 [96393]: https://github.com/rust-lang/rust/pull/96393/
770 [96436]: https://github.com/rust-lang/rust/pull/96436/
771 [96557]: https://github.com/rust-lang/rust/pull/96557/
772 [96630]: https://github.com/rust-lang/rust/pull/96630/
774 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
775 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
776 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
777 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
778 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
779 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
780 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
781 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
782 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
783 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
785 Version 1.61.0 (2022-05-19)
786 ==========================
791 - [`const fn` signatures can now include generic trait bounds][93827]
792 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
793 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
794 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
799 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
800 - [The `char` type is now described as UTF-32 in debuginfo][89887]
801 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
802 - X86 [`#[target_feature = "adx"]` is now stable][93745]
807 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
808 - [`#[ignore = "…"]` messages are printed when running tests][92714]
809 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
810 - [Make `std::io::stdio::lock()` return `'static` handles.][93965] Previously, the creation of locked handles to stdin/stdout/stderr would borrow the handles being locked, which prevented writing `let out = std::io::stdout().lock();` because `out` would outlive the return value of `stdout()`. Such code now works, eliminating a common pitfall that affected many Rust users.
811 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
812 - [`std::thread::available_parallelism` now takes cgroup quotas into account.][92697] Since `available_parallelism` is often used to create a thread pool for parallel computation, which may be CPU-bound for performance, `available_parallelism` will return a value consistent with the ability to use that many threads continuously, if possible. For instance, in a container with 8 virtual CPUs but quotas only allowing for 50% usage, `available_parallelism` will return 4.
817 - [`Pin::static_mut`]
818 - [`Pin::static_ref`]
819 - [`Vec::retain_mut`]
820 - [`VecDeque::retain_mut`]
821 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
822 - [`std::os::unix::net::SocketAddr::from_pathname`]
823 - [`std::process::ExitCode`] and [`std::process::Termination`]. The stabilization of these two APIs now makes it possible for programs to return errors from `main` with custom exit codes.
824 - [`std::thread::JoinHandle::is_finished`]
826 These APIs are now usable in const contexts:
828 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
829 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
830 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
831 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
832 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
833 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
834 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
835 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
836 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
841 No feature changes, but see compatibility notes.
846 - Previously native static libraries were linked as `whole-archive` in some cases, but now rustc tries not to use `whole-archive` unless explicitly requested. This [change][93901] may result in linking errors in some cases. To fix such errors, native libraries linked from the command line, build scripts, or [`#[link]` attributes][link-attr] need to
847 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
848 - (less common) or be updated to use the [`+whole-archive`] modifier.
849 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
850 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
851 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
852 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
853 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
854 - [`cfg` predicates in `all()` and `any()` are always evaluated to detect errors, instead of short-circuiting.][94295] The compatibility considerations here arise in nightly-only code that used the short-circuiting behavior of `all` to write something like `cfg(all(feature = "nightly", syntax-requiring-nightly))`, which will now fail to compile. Instead, use either `cfg_attr(feature = "nightly", ...)` or nested uses of `cfg`.
855 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
860 These changes provide no direct user facing benefits, but represent significant
861 improvements to the internals and overall performance of rustc
864 - [debuginfo: Refactor debuginfo generation for types][94261]
865 - [Remove the everybody loops pass][93913]
867 [88375]: https://github.com/rust-lang/rust/pull/88375/
868 [89887]: https://github.com/rust-lang/rust/pull/89887/
869 [90621]: https://github.com/rust-lang/rust/pull/90621/
870 [92285]: https://github.com/rust-lang/rust/pull/92285/
871 [92472]: https://github.com/rust-lang/rust/pull/92472/
872 [92697]: https://github.com/rust-lang/rust/pull/92697/
873 [92714]: https://github.com/rust-lang/rust/pull/92714/
874 [92911]: https://github.com/rust-lang/rust/pull/92911/
875 [93263]: https://github.com/rust-lang/rust/pull/93263/
876 [93745]: https://github.com/rust-lang/rust/pull/93745/
877 [93827]: https://github.com/rust-lang/rust/pull/93827/
878 [93901]: https://github.com/rust-lang/rust/pull/93901/
879 [93913]: https://github.com/rust-lang/rust/pull/93913/
880 [93965]: https://github.com/rust-lang/rust/pull/93965/
881 [94081]: https://github.com/rust-lang/rust/pull/94081/
882 [94261]: https://github.com/rust-lang/rust/pull/94261/
883 [94295]: https://github.com/rust-lang/rust/pull/94295/
884 [94832]: https://github.com/rust-lang/rust/pull/94832/
885 [95016]: https://github.com/rust-lang/rust/pull/95016/
886 [95251]: https://github.com/rust-lang/rust/pull/95251/
887 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
888 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
889 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
890 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
891 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
892 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
893 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
894 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
895 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
896 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
897 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
898 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
899 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
900 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
901 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
902 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
903 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
904 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
905 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
906 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
907 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
908 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
911 Version 1.60.0 (2022-04-07)
912 ==========================
916 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
917 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
921 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
922 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
923 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
924 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
925 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
926 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
927 - [Fix invalid removal of newlines from doc comments][92357]
928 - [Add kernel target for RustyHermit][92670]
929 - [Deny mixing bin crate type with lib crate types][92933]
930 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
931 - [Upgrade to LLVM 14][93577]
933 \* Refer to Rust's [platform support page][platform-support-doc] for more
934 information on Rust's tiered platform support.
938 - [Guarantee call order for `sort_by_cached_key`][89621]
939 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
940 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
941 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
942 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
946 - [`Arc::new_cyclic`][arc_new_cyclic]
947 - [`Rc::new_cyclic`][rc_new_cyclic]
948 - [`slice::EscapeAscii`][slice_escape_ascii]
949 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
950 - [`u8::escape_ascii`][u8_escape_ascii]
951 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
952 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
953 - [`MaybeUninit::assume_init_read`][assume_init_read]
954 - [`i8::abs_diff`][i8_abs_diff]
955 - [`i16::abs_diff`][i16_abs_diff]
956 - [`i32::abs_diff`][i32_abs_diff]
957 - [`i64::abs_diff`][i64_abs_diff]
958 - [`i128::abs_diff`][i128_abs_diff]
959 - [`isize::abs_diff`][isize_abs_diff]
960 - [`u8::abs_diff`][u8_abs_diff]
961 - [`u16::abs_diff`][u16_abs_diff]
962 - [`u32::abs_diff`][u32_abs_diff]
963 - [`u64::abs_diff`][u64_abs_diff]
964 - [`u128::abs_diff`][u128_abs_diff]
965 - [`usize::abs_diff`][usize_abs_diff]
966 - [`Display for io::ErrorKind`][display_error_kind]
967 - [`From<u8> for ExitCode`][from_u8_exit_code]
968 - [`Not for !` (the "never" type)][not_never]
969 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
970 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
974 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
975 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
976 - [Stabilize namespaced and weak dependency features.][cargo/10269]
977 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
978 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
982 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
983 - [Drop rustc-docs from complete profile][93742]
984 - [bootstrap: tidy up flag handling for llvm build][93918]
988 - [Remove compiler-rt linking hack on Android][83822]
989 - [Mitigations for platforms with non-monotonic clocks have been removed from
990 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
991 instant is not guaranteed to be greater than an earlier instant anymore.
992 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
993 saturating to `0` instead][89926]. In the real world the panic happened mostly
994 on platforms with buggy monotonic clock implementations rather than catching
995 programming errors like reversing the start and end times. Such programming
996 errors will now results in `0` rather than a panic.
997 - In a future release we're planning to increase the baseline requirements for
998 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
999 your feedback in [PR #95026][95026].
1004 These changes provide no direct user facing benefits, but represent significant
1005 improvements to the internals and overall performance of rustc
1008 - [Switch all libraries to the 2021 edition][92068]
1010 [83822]: https://github.com/rust-lang/rust/pull/83822
1011 [86374]: https://github.com/rust-lang/rust/pull/86374
1012 [87487]: https://github.com/rust-lang/rust/pull/87487
1013 [89621]: https://github.com/rust-lang/rust/pull/89621
1014 [89926]: https://github.com/rust-lang/rust/pull/89926
1015 [90132]: https://github.com/rust-lang/rust/pull/90132
1016 [90247]: https://github.com/rust-lang/rust/pull/90247
1017 [91606]: https://github.com/rust-lang/rust/pull/91606
1018 [92068]: https://github.com/rust-lang/rust/pull/92068
1019 [92300]: https://github.com/rust-lang/rust/pull/92300
1020 [92357]: https://github.com/rust-lang/rust/pull/92357
1021 [92383]: https://github.com/rust-lang/rust/pull/92383
1022 [92630]: https://github.com/rust-lang/rust/pull/92630
1023 [92670]: https://github.com/rust-lang/rust/pull/92670
1024 [92800]: https://github.com/rust-lang/rust/pull/92800
1025 [92933]: https://github.com/rust-lang/rust/pull/92933
1026 [93566]: https://github.com/rust-lang/rust/pull/93566
1027 [93577]: https://github.com/rust-lang/rust/pull/93577
1028 [93658]: https://github.com/rust-lang/rust/pull/93658
1029 [93742]: https://github.com/rust-lang/rust/pull/93742
1030 [93824]: https://github.com/rust-lang/rust/pull/93824
1031 [93918]: https://github.com/rust-lang/rust/pull/93918
1032 [95026]: https://github.com/rust-lang/rust/pull/95026
1034 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
1035 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
1036 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
1037 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
1038 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
1040 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
1041 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
1042 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
1043 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
1044 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
1045 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
1046 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
1047 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
1048 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
1049 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
1050 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
1051 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
1052 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
1053 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
1054 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
1055 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
1056 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
1057 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
1058 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
1059 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
1060 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
1061 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
1062 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
1063 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
1064 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
1066 Version 1.59.0 (2022-02-24)
1067 ==========================
1072 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
1073 - [Stabilize destructuring assignment][90521]
1074 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
1075 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
1080 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
1081 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
1082 - [Fix sparc64 ABI for aggregates with floating point members][91003]
1083 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
1084 - [Add support for riscv64gc-unknown-freebsd][91284]
1085 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
1086 - [Soft disable incremental compilation][94124]
1088 This release disables incremental compilation, unless the user has explicitly
1089 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1090 This is due to a known and relatively frequently occurring bug in incremental
1091 compilation, which causes builds to issue internal compiler errors. This
1092 particular bug is already fixed on nightly, but that fix has not yet rolled out
1093 to stable and is deemed too risky for a direct stable backport.
1095 As always, we encourage users to test with nightly and report bugs so that we
1096 can track failures and fix issues earlier.
1098 See [94124] for more details.
1100 [94124]: https://github.com/rust-lang/rust/issues/94124
1105 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
1110 - [`std::thread::available_parallelism`][available_parallelism]
1111 - [`Result::copied`][result-copied]
1112 - [`Result::cloned`][result-cloned]
1113 - [`arch::asm!`][asm]
1114 - [`arch::global_asm!`][global_asm]
1115 - [`ops::ControlFlow::is_break`][is_break]
1116 - [`ops::ControlFlow::is_continue`][is_continue]
1117 - [`TryFrom<char> for u8`][try_from_char_u8]
1118 - [`char::TryFromCharError`][try_from_char_err]
1119 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
1120 - [`iter::zip`][zip]
1121 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
1122 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
1123 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
1124 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
1125 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
1126 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
1127 - [`DoubleEndedIterator for ToLowercase`][lowercase]
1128 - [`DoubleEndedIterator for ToUppercase`][uppercase]
1129 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
1130 - [`UnwindSafe for Once`][unwindsafe_once]
1131 - [`RefUnwindSafe for Once`][refunwindsafe_once]
1132 - [armv8 neon intrinsics for aarch64][stdarch/1266]
1136 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
1137 - [`mem::MaybeUninit::assume_init`][muninit_init]
1138 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
1139 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
1144 - [Stabilize the `strip` profile option][cargo/10088]
1145 - [Stabilize future-incompat-report][cargo/10165]
1146 - [Support abbreviating `--release` as `-r`][cargo/10133]
1147 - [Support `term.quiet` configuration][cargo/10152]
1148 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
1153 - [Refactor weak symbols in std::sys::unix][90846]
1154 This may add new, versioned, symbols when building with a newer glibc, as the
1155 standard library uses weak linkage rather than dynamically attempting to load
1156 certain symbols at runtime.
1157 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
1158 This adds a future compatibility lint to supporting the use of cfg_attr
1159 wrapping either crate_type or crate_name specification within Rust files;
1160 it is recommended that users migrate to setting the equivalent command line
1162 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
1163 This may expose new names, leading to conflicts with preexisting names in a
1164 given namespace and a compilation failure.
1165 - [Cargo will document libraries before binaries.][cargo/10172]
1166 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
1167 - [Weaken guarantee around advancing underlying iterators in zip][83791]
1168 - [Make split_inclusive() on an empty slice yield an empty output][89825]
1169 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
1170 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
1175 These changes provide no direct user facing benefits, but represent significant
1176 improvements to the internals and overall performance of rustc
1179 - [Fix many cases of normalization-related ICEs][91255]
1180 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
1181 - [Store liveness in interval sets for region inference][90637]
1183 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
1184 unstable feature.][91867]
1186 [91867]: https://github.com/rust-lang/rust/issues/91867
1187 [83744]: https://github.com/rust-lang/rust/pull/83744/
1188 [83791]: https://github.com/rust-lang/rust/pull/83791/
1189 [85013]: https://github.com/rust-lang/rust/pull/85013/
1190 [89825]: https://github.com/rust-lang/rust/pull/89825/
1191 [89999]: https://github.com/rust-lang/rust/pull/89999/
1192 [90128]: https://github.com/rust-lang/rust/pull/90128/
1193 [90207]: https://github.com/rust-lang/rust/pull/90207/
1194 [90521]: https://github.com/rust-lang/rust/pull/90521/
1195 [90586]: https://github.com/rust-lang/rust/pull/90586/
1196 [90637]: https://github.com/rust-lang/rust/pull/90637/
1197 [90833]: https://github.com/rust-lang/rust/pull/90833/
1198 [90846]: https://github.com/rust-lang/rust/pull/90846/
1199 [91003]: https://github.com/rust-lang/rust/pull/91003/
1200 [91172]: https://github.com/rust-lang/rust/pull/91172/
1201 [91255]: https://github.com/rust-lang/rust/pull/91255/
1202 [91284]: https://github.com/rust-lang/rust/pull/91284/
1203 [91535]: https://github.com/rust-lang/rust/pull/91535/
1204 [91593]: https://github.com/rust-lang/rust/pull/91593/
1205 [91728]: https://github.com/rust-lang/rust/pull/91728/
1206 [91878]: https://github.com/rust-lang/rust/pull/91878/
1207 [91896]: https://github.com/rust-lang/rust/pull/91896/
1208 [91926]: https://github.com/rust-lang/rust/pull/91926/
1209 [91984]: https://github.com/rust-lang/rust/pull/91984/
1210 [92020]: https://github.com/rust-lang/rust/pull/92020/
1211 [92034]: https://github.com/rust-lang/rust/pull/92034/
1212 [92137]: https://github.com/rust-lang/rust/pull/92137/
1213 [92483]: https://github.com/rust-lang/rust/pull/92483/
1214 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
1215 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
1216 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
1217 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
1218 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
1219 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
1220 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
1221 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
1223 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
1224 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
1225 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
1226 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1227 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
1228 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
1229 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
1230 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
1231 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
1232 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
1233 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
1234 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
1235 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
1236 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
1237 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
1238 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
1239 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
1240 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
1241 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
1242 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
1243 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
1244 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
1245 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
1246 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
1247 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
1248 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
1250 Version 1.58.1 (2022-01-19)
1251 ===========================
1253 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
1254 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
1255 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
1256 * [Fix wrong error message displayed when some imports are missing][91254]
1257 * [Fix rustfmt not formatting generated files from stdin][92912]
1259 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
1260 [91254]: https://github.com/rust-lang/rust/pull/91254
1261 [92912]: https://github.com/rust-lang/rust/pull/92912
1262 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
1263 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
1265 Version 1.58.0 (2022-01-13)
1266 ==========================
1271 - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect.
1272 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
1273 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
1278 - [Add LLVM CFI support to the Rust compiler][89652]
1279 - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo.
1280 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
1281 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
1282 - [Update the minimum external LLVM to 12][90175]
1283 - [Add `x86_64-unknown-none` at Tier 3*][89062]
1284 - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries.
1285 - [Don't abort compilation after giving a lint error][87337]
1286 - [Error messages point at the source of trait bound obligations in more places][89580]
1288 \* Refer to Rust's [platform support page][platform-support-doc] for more
1289 information on Rust's tiered platform support.
1294 - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value.
1295 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
1296 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
1297 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
1298 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
1299 - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program).
1304 - [`Metadata::is_symlink`]
1305 - [`Path::is_symlink`]
1306 - [`{integer}::saturating_div`]
1307 - [`Option::unwrap_unchecked`]
1308 - [`Result::unwrap_unchecked`]
1309 - [`Result::unwrap_err_unchecked`]
1312 These APIs are now usable in const contexts:
1315 - [`Duration::checked_add`]
1316 - [`Duration::saturating_add`]
1317 - [`Duration::checked_sub`]
1318 - [`Duration::saturating_sub`]
1319 - [`Duration::checked_mul`]
1320 - [`Duration::saturating_mul`]
1321 - [`Duration::checked_div`]
1326 - [Add --message-format for install command][cargo/10107]
1327 - [Warn when alias shadows external subcommand][cargo/10082]
1332 - [Show all Deref implementations recursively in rustdoc][90183]
1333 - [Use computed visibility in rustdoc][88447]
1338 - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library.
1339 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1340 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1341 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1342 - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc.
1343 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1348 These changes provide no direct user facing benefits, but represent significant
1349 improvements to the internals and overall performance of rustc
1352 - [Implement coherence checks for negative trait impls][90104]
1353 - [Add rustc lint, warning when iterating over hashmaps][89558]
1354 - [Optimize live point computation][90491]
1355 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1356 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1358 [87337]: https://github.com/rust-lang/rust/pull/87337/
1359 [87467]: https://github.com/rust-lang/rust/pull/87467/
1360 [87704]: https://github.com/rust-lang/rust/pull/87704/
1361 [88041]: https://github.com/rust-lang/rust/pull/88041/
1362 [88447]: https://github.com/rust-lang/rust/pull/88447/
1363 [88601]: https://github.com/rust-lang/rust/pull/88601/
1364 [89062]: https://github.com/rust-lang/rust/pull/89062/
1365 [89174]: https://github.com/rust-lang/rust/pull/89174/
1366 [89551]: https://github.com/rust-lang/rust/pull/89551/
1367 [89558]: https://github.com/rust-lang/rust/pull/89558/
1368 [89580]: https://github.com/rust-lang/rust/pull/89580/
1369 [89652]: https://github.com/rust-lang/rust/pull/89652/
1370 [90041]: https://github.com/rust-lang/rust/pull/90041/
1371 [90058]: https://github.com/rust-lang/rust/pull/90058/
1372 [90104]: https://github.com/rust-lang/rust/pull/90104/
1373 [90117]: https://github.com/rust-lang/rust/pull/90117/
1374 [90175]: https://github.com/rust-lang/rust/pull/90175/
1375 [90183]: https://github.com/rust-lang/rust/pull/90183/
1376 [90297]: https://github.com/rust-lang/rust/pull/90297/
1377 [90329]: https://github.com/rust-lang/rust/pull/90329/
1378 [90361]: https://github.com/rust-lang/rust/pull/90361/
1379 [90417]: https://github.com/rust-lang/rust/pull/90417/
1380 [90473]: https://github.com/rust-lang/rust/pull/90473/
1381 [90491]: https://github.com/rust-lang/rust/pull/90491/
1382 [90733]: https://github.com/rust-lang/rust/pull/90733/
1383 [90833]: https://github.com/rust-lang/rust/pull/90833/
1384 [90846]: https://github.com/rust-lang/rust/pull/90846/
1385 [91026]: https://github.com/rust-lang/rust/pull/91026/
1386 [91207]: https://github.com/rust-lang/rust/pull/91207/
1387 [91255]: https://github.com/rust-lang/rust/pull/91255/
1388 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1389 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1390 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1391 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1392 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1393 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1394 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1395 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1396 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1397 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1399 Version 1.57.0 (2021-12-02)
1400 ==========================
1405 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1406 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1407 - [Allow panicking in constant evaluation.][89508]
1408 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1413 - [Create more accurate debuginfo for vtables.][89597]
1414 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1415 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1416 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1417 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1419 \* Refer to Rust's [platform support page][platform-support-doc] for more
1420 information on Rust's tiered platform support.
1425 - [Avoid allocations and copying in `Vec::leak`][89337]
1426 - [Add `#[repr(i8)]` to `Ordering`][89507]
1427 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1428 - [Update to Unicode 14.0][89614]
1429 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1430 when ignoring their return value. This helps catch mistakes such as expecting
1431 a function to mutate a value in place rather than return a new value.
1436 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1437 - [`[T; N]::as_slice`][`array::as_slice`]
1438 - [`collections::TryReserveError`]
1439 - [`HashMap::try_reserve`]
1440 - [`HashSet::try_reserve`]
1441 - [`String::try_reserve`]
1442 - [`String::try_reserve_exact`]
1443 - [`Vec::try_reserve`]
1444 - [`Vec::try_reserve_exact`]
1445 - [`VecDeque::try_reserve`]
1446 - [`VecDeque::try_reserve_exact`]
1447 - [`Iterator::map_while`]
1448 - [`iter::MapWhile`]
1449 - [`proc_macro::is_available`]
1450 - [`Command::get_program`]
1451 - [`Command::get_args`]
1452 - [`Command::get_envs`]
1453 - [`Command::get_current_dir`]
1457 These APIs are now usable in const contexts:
1459 - [`hint::unreachable_unchecked`]
1464 - [Stabilize custom profiles][cargo/9943]
1469 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1470 This will break some builds that set `#![deny(dead_code)]`.
1474 These changes provide no direct user facing benefits, but represent significant
1475 improvements to the internals and overall performance of rustc
1478 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1480 [85200]: https://github.com/rust-lang/rust/pull/85200/
1481 [86191]: https://github.com/rust-lang/rust/pull/86191/
1482 [87220]: https://github.com/rust-lang/rust/pull/87220/
1483 [87260]: https://github.com/rust-lang/rust/pull/87260/
1484 [88321]: https://github.com/rust-lang/rust/pull/88321/
1485 [88529]: https://github.com/rust-lang/rust/pull/88529/
1486 [88690]: https://github.com/rust-lang/rust/pull/88690/
1487 [88952]: https://github.com/rust-lang/rust/pull/88952/
1488 [89337]: https://github.com/rust-lang/rust/pull/89337/
1489 [89507]: https://github.com/rust-lang/rust/pull/89507/
1490 [89508]: https://github.com/rust-lang/rust/pull/89508/
1491 [89582]: https://github.com/rust-lang/rust/pull/89582/
1492 [89597]: https://github.com/rust-lang/rust/pull/89597/
1493 [89614]: https://github.com/rust-lang/rust/pull/89614/
1494 [89692]: https://github.com/rust-lang/rust/issues/89692/
1495 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1496 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1497 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1498 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1499 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1500 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1501 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1502 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1503 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1504 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1505 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1506 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1507 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1508 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1509 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1510 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1511 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1512 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1513 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1514 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1515 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1517 Version 1.56.1 (2021-11-01)
1518 ===========================
1520 - New lints to detect the presence of bidirectional-override Unicode
1521 codepoints in the compiled source code ([CVE-2021-42574])
1523 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1525 Version 1.56.0 (2021-10-21)
1526 ========================
1531 - [The 2021 Edition is now stable.][rust#88100]
1532 See [the edition guide][rust-2021-edition-guide] for more details.
1533 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1534 - [Union field access is permitted in `const fn`.][rust#85769]
1536 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1541 - [Upgrade to LLVM 13.][rust#87570]
1542 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1543 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1544 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1545 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1546 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1547 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1548 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1550 \* Refer to Rust's [platform support page][platform-support-doc] for more
1551 information on Rust's tiered platform support.
1556 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1557 The Windows console still requires valid Unicode, but this change allows
1558 splitting a UTF-8 character across multiple write calls. This allows, for
1559 instance, programs that just read and write data buffers (e.g. copying a file
1560 to stdout) without regard for Unicode or character boundaries.
1561 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1562 For this use case, atomics scale much better under contention.
1563 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1564 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1565 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1566 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1567 - [Treat invalid environment variable names as non-existent.][rust#86183]
1568 Previously, the environment functions would panic if given a variable name
1569 with an internal null character or equal sign (`=`). Now, these functions will
1570 just treat such names as non-existent variables, since the OS cannot represent
1571 the existence of a variable with such a name.
1576 - [`std::os::unix::fs::chroot`]
1577 - [`UnsafeCell::raw_get`]
1578 - [`BufWriter::into_parts`]
1579 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1580 These APIs were previously stable in `std`, but are now also available in `core`.
1581 - [`Vec::shrink_to`]
1582 - [`String::shrink_to`]
1583 - [`OsString::shrink_to`]
1584 - [`PathBuf::shrink_to`]
1585 - [`BinaryHeap::shrink_to`]
1586 - [`VecDeque::shrink_to`]
1587 - [`HashMap::shrink_to`]
1588 - [`HashSet::shrink_to`]
1590 These APIs are now usable in const contexts:
1592 - [`std::mem::transmute`]
1593 - [`[T]::first`][`slice::first`]
1594 - [`[T]::split_first`][`slice::split_first`]
1595 - [`[T]::last`][`slice::last`]
1596 - [`[T]::split_last`][`slice::split_last`]
1601 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1602 This has no effect at present on dependency version selection.
1603 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1604 that support Rust code to include a crate's specified minimum version in the test matrix for that
1610 - [Update to new argument parsing rules on Windows.][rust#87580]
1611 This adjusts Rust's standard library to match the behavior of the standard
1612 libraries for C/C++. The rules have changed slightly over time, and this PR
1613 brings us to the latest set of rules (changed in 2008).
1614 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1615 This was already not supported by LLVM; this change surfaces this lack of
1616 support with a better error message.
1617 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1618 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1619 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1620 may return different values on glibc <= 2.24.][rust#81825]
1621 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1622 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1623 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1624 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1628 These changes provide no direct user facing benefits, but represent significant
1629 improvements to the internals and overall performance of rustc
1632 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1633 This improves the performance of most Rust builds.
1634 - [Unify representation of macros in internal data structures.][rust#88019]
1635 This change fixes a host of bugs with the handling of macros by the compiler,
1638 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1639 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1640 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1641 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1642 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1643 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1644 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1645 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1646 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1647 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1648 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1649 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1650 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1651 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1652 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1653 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1654 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1655 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1656 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1657 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1658 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1659 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1660 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1661 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1662 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1663 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1664 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1665 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1666 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1667 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1668 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1669 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1670 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1671 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1672 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1673 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1674 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1675 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1676 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1677 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1678 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1679 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1681 Version 1.55.0 (2021-09-09)
1682 ============================
1686 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1687 will end at the maximum value of the integer.][83918]
1688 - [You can now explicitly import the prelude of different editions
1689 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1693 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1695 \* Refer to Rust's [platform support page][platform-support-doc] for more
1696 information on Rust's tiered platform support.
1701 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1702 These improvements should in general provide faster string parsing of floats,
1703 no longer reject certain valid floating point values, and reduce
1704 the produced code size for non-stripped artifacts.
1705 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1712 - [`IntoInnerError::into_error`]
1713 - [`IntoInnerError::into_parts`]
1714 - [`MaybeUninit::assume_init_mut`]
1715 - [`MaybeUninit::assume_init_ref`]
1716 - [`MaybeUninit::write`]
1718 - [`ops::ControlFlow`]
1720 - [`x86::_bittestandcomplement`]
1721 - [`x86::_bittestandreset`]
1722 - [`x86::_bittestandset`]
1723 - [`x86_64::_bittest64`]
1724 - [`x86_64::_bittestandcomplement64`]
1725 - [`x86_64::_bittestandreset64`]
1726 - [`x86_64::_bittestandset64`]
1728 The following previously stable functions are now `const`.
1730 - [`str::from_utf8_unchecked`]
1735 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1736 rustc in parallel such as when using `cargo test`.][cargo/9675]
1737 - [The package definition in `cargo metadata` now includes the `"default_run"`
1738 field from the manifest.][cargo/9550]
1739 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1740 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1741 of packages.][cargo/9663]
1745 - [Added "Go to item on exact match" search option.][85876]
1746 - [The "Implementors" section on traits no longer shows redundant
1747 method definitions.][85970]
1748 - [Trait implementations are toggled open by default.][86260] This should make the
1749 implementations more searchable by tools like `CTRL+F` in your browser.
1750 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1751 through type aliases.][86334]
1752 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1753 "Trait Implementations" section.][86513]
1758 - [std functions that return an `io::Error` will no longer use the
1759 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1760 kinds of errors could be categorised [into newer more specific `ErrorKind`
1761 variants][79965], and that they do not represent a user error.
1762 - [Using environment variable names with `process::Command` on Windows now
1763 behaves as expected.][85270] Previously using envionment variables with
1764 `Command` would cause them to be ASCII-uppercased.
1765 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1766 with `rustdoc::`][86849]
1767 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1768 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1769 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1772 [86849]: https://github.com/rust-lang/rust/pull/86849
1773 [86513]: https://github.com/rust-lang/rust/pull/86513
1774 [86334]: https://github.com/rust-lang/rust/pull/86334
1775 [86260]: https://github.com/rust-lang/rust/pull/86260
1776 [85970]: https://github.com/rust-lang/rust/pull/85970
1777 [85876]: https://github.com/rust-lang/rust/pull/85876
1778 [83572]: https://github.com/rust-lang/rust/pull/83572
1779 [86294]: https://github.com/rust-lang/rust/pull/86294
1780 [86858]: https://github.com/rust-lang/rust/pull/86858
1781 [86761]: https://github.com/rust-lang/rust/pull/86761
1782 [85746]: https://github.com/rust-lang/rust/pull/85746
1783 [85270]: https://github.com/rust-lang/rust/pull/85270
1784 [83918]: https://github.com/rust-lang/rust/pull/83918
1785 [79965]: https://github.com/rust-lang/rust/pull/79965
1786 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1787 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1788 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1789 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1790 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1791 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1792 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1793 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1794 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1795 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1796 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1797 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1798 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1799 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1800 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1801 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1802 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1803 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1804 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1805 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1806 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1807 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1810 Version 1.54.0 (2021-07-29)
1811 ============================
1814 -----------------------
1816 - [You can now use macros for values in some built-in attributes.][83366]
1817 This primarily allows you to call macros within the `#[doc]` attribute. For
1818 example, to include external documentation in your crate, you can now write
1821 #![doc = include_str!("README.md")]
1824 - [You can now cast between unsized slice types (and types which contain
1825 unsized slices) in `const fn`.][85078]
1826 - [You can now use multiple generic lifetimes with `impl Trait` where the
1827 lifetimes don't explicitly outlive another.][84701] In code this means
1828 that you can now have `impl Trait<'a, 'b>` where as before you could
1829 only have `impl Trait<'a, 'b> where 'b: 'a`.
1832 -----------------------
1834 - [Rustc will now search for custom JSON targets in
1835 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1836 directory.][83800] You can find your sysroot directory by running
1837 `rustc --print sysroot`.
1838 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1839 - [You can now use `#[target_feature]` on safe functions when targeting
1840 WebAssembly platforms.][84988]
1841 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1842 - [Added tier 3\* support for `bpfel-unknown-none`
1843 and `bpfeb-unknown-none`.][79608]
1844 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1846 \* Refer to Rust's [platform support page][platform-support-doc] for more
1847 information on Rust's tiered platform support.
1850 -----------------------
1852 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1853 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1854 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1855 - [The implementations of vendor intrinsics in core::arch have been
1856 significantly refactored.][83278] The main user-visible changes are
1857 a 50% reduction in the size of libcore.rlib and stricter validation
1858 of constant operands passed to intrinsics. The latter is technically
1859 a breaking change, but allows Rust to more closely match the C vendor
1865 - [`BTreeMap::into_keys`]
1866 - [`BTreeMap::into_values`]
1867 - [`HashMap::into_keys`]
1868 - [`HashMap::into_values`]
1870 - [`VecDeque::binary_search`]
1871 - [`VecDeque::binary_search_by`]
1872 - [`VecDeque::binary_search_by_key`]
1873 - [`VecDeque::partition_point`]
1878 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1879 the dependency graph.][cargo/9520]
1880 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1881 in the tree ][cargo/9499]
1882 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1883 macro dependencies.][cargo/9488]
1884 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1885 This variable points to a directory that integration tests and benches
1886 can use as a "scratchpad" for testing filesystem operations.
1890 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1891 - [Previously unsound code is no longer permitted where different constructors in branches
1892 could require different lifetimes.][85574]
1893 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1894 than before and may reject some previously accepted code.
1895 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1896 when compiled with `codegen-units = 1`.][86063]
1898 [85574]: https://github.com/rust-lang/rust/issues/85574
1899 [86831]: https://github.com/rust-lang/rust/issues/86831
1900 [86063]: https://github.com/rust-lang/rust/issues/86063
1901 [79608]: https://github.com/rust-lang/rust/pull/79608
1902 [84988]: https://github.com/rust-lang/rust/pull/84988
1903 [84701]: https://github.com/rust-lang/rust/pull/84701
1904 [84072]: https://github.com/rust-lang/rust/pull/84072
1905 [85745]: https://github.com/rust-lang/rust/pull/85745
1906 [84744]: https://github.com/rust-lang/rust/pull/84744
1907 [85078]: https://github.com/rust-lang/rust/pull/85078
1908 [84717]: https://github.com/rust-lang/rust/pull/84717
1909 [83800]: https://github.com/rust-lang/rust/pull/83800
1910 [83366]: https://github.com/rust-lang/rust/pull/83366
1911 [83278]: https://github.com/rust-lang/rust/pull/83278
1912 [85292]: https://github.com/rust-lang/rust/pull/85292
1913 [82834]: https://github.com/rust-lang/rust/pull/82834
1914 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1915 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1916 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1917 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1918 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1919 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1920 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1921 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1922 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1923 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1924 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1926 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1928 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1930 Version 1.53.0 (2021-06-17)
1931 ============================
1934 -----------------------
1935 - [You can now use unicode for identifiers.][83799] This allows multilingual
1936 identifiers but still doesn't allow glyphs that are not considered characters
1937 such as `◆` or `🦀`. More specifically you can now use any identifier that
1938 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1939 is the same standard as languages like Python, however Rust uses NFC
1940 normalization which may be different from other languages.
1941 - [You can now specify "or patterns" inside pattern matches.][79278]
1942 Previously you could only use `|` (OR) on complete patterns. E.g.
1946 matches!(x, Some(1) | Some(2));
1948 matches!(x, Some(1 | 2));
1950 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1951 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1952 to change semantics to being a pattern fragment in a future edition.
1955 -----------------------
1956 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1957 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1958 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1960 \* Refer to Rust's [platform support page][platform-support-doc] for more
1961 information on Rust's tiered platform support.
1964 -----------------------
1965 - [Abort messages will now forward to `android_set_abort_message` on
1966 Android platforms when available.][81469]
1967 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1968 - [Arrays of any length now implement `IntoIterator`.][84147]
1969 Currently calling `.into_iter()` as a method on an array will
1970 return `impl Iterator<Item=&T>`, but this may change in a
1971 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1972 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1973 - [`leading_zeros`, and `trailing_zeros` are now available on all
1974 `NonZero` integer types.][84082]
1975 - [`{f32, f64}::from_str` now parse and print special values
1976 (`NaN`, `-0`) according to IEEE 754.][78618]
1977 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1978 - [Add the `BITS` associated constant to all numeric types.][82565]
1982 - [`AtomicBool::fetch_update`]
1983 - [`AtomicPtr::fetch_update`]
1984 - [`BTreeMap::retain`]
1985 - [`BTreeSet::retain`]
1986 - [`BufReader::seek_relative`]
1987 - [`DebugStruct::non_exhaustive`]
1989 - [`Duration::ZERO`]
1990 - [`Duration::is_zero`]
1991 - [`Duration::saturating_add`]
1992 - [`Duration::saturating_mul`]
1993 - [`Duration::saturating_sub`]
1994 - [`ErrorKind::Unsupported`]
1995 - [`Option::insert`]
1996 - [`Ordering::is_eq`]
1997 - [`Ordering::is_ge`]
1998 - [`Ordering::is_gt`]
1999 - [`Ordering::is_le`]
2000 - [`Ordering::is_lt`]
2001 - [`Ordering::is_ne`]
2002 - [`OsStr::is_ascii`]
2003 - [`OsStr::make_ascii_lowercase`]
2004 - [`OsStr::make_ascii_uppercase`]
2005 - [`OsStr::to_ascii_lowercase`]
2006 - [`OsStr::to_ascii_uppercase`]
2007 - [`Peekable::peek_mut`]
2008 - [`Rc::decrement_strong_count`]
2009 - [`Rc::increment_strong_count`]
2010 - [`Vec::extend_from_within`]
2011 - [`array::from_mut`]
2012 - [`array::from_ref`]
2013 - [`cmp::max_by_key`]
2015 - [`cmp::min_by_key`]
2017 - [`f32::is_subnormal`]
2018 - [`f64::is_subnormal`]
2021 -----------------------
2022 - [Cargo now supports git repositories where the default `HEAD` branch is not
2023 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
2024 which can handle default branches correctly.
2025 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
2026 - [The `authors` field is no longer included in `Cargo.toml` for new
2027 projects.][cargo/9282]
2030 -----------------------
2031 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
2032 without hyperlinks.][81764]
2036 - [Implement token-based handling of attributes during expansion][82608]
2037 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
2038 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
2039 to confusion and potential security vulnerabilities and [is no
2040 longer recommended][ietf6943].
2041 - [The added `BITS` constant may conflict with external definitions.][85667]
2042 In particular, this was known to be a problem in the `lexical-core` crate,
2043 but they have published fixes for semantic versions 0.4 through 0.7. To
2044 update this dependency alone, use `cargo update -p lexical-core`.
2045 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
2049 These changes provide no direct user facing benefits, but represent significant
2050 improvements to the internals and overall performance of rustc and
2053 - [Rework the `std::sys::windows::alloc` implementation.][83065]
2054 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
2055 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
2056 - [Rework rustdoc const type][82873]
2058 [85667]: https://github.com/rust-lang/rust/pull/85667
2059 [83386]: https://github.com/rust-lang/rust/pull/83386
2060 [82771]: https://github.com/rust-lang/rust/pull/82771
2061 [84147]: https://github.com/rust-lang/rust/pull/84147
2062 [84082]: https://github.com/rust-lang/rust/pull/84082
2063 [83799]: https://github.com/rust-lang/rust/pull/83799
2064 [83681]: https://github.com/rust-lang/rust/pull/83681
2065 [83652]: https://github.com/rust-lang/rust/pull/83652
2066 [83387]: https://github.com/rust-lang/rust/pull/83387
2067 [82873]: https://github.com/rust-lang/rust/pull/82873
2068 [82864]: https://github.com/rust-lang/rust/pull/82864
2069 [82608]: https://github.com/rust-lang/rust/pull/82608
2070 [82565]: https://github.com/rust-lang/rust/pull/82565
2071 [80525]: https://github.com/rust-lang/rust/pull/80525
2072 [79278]: https://github.com/rust-lang/rust/pull/79278
2073 [78618]: https://github.com/rust-lang/rust/pull/78618
2074 [77704]: https://github.com/rust-lang/rust/pull/77704
2075 [83941]: https://github.com/rust-lang/rust/pull/83941
2076 [83065]: https://github.com/rust-lang/rust/pull/83065
2077 [81764]: https://github.com/rust-lang/rust/pull/81764
2078 [81469]: https://github.com/rust-lang/rust/pull/81469
2079 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
2080 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
2081 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
2082 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
2083 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
2084 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
2085 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
2086 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
2087 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
2088 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
2089 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
2090 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
2091 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
2092 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
2093 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
2094 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
2095 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
2096 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
2097 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
2098 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
2099 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
2100 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
2101 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
2102 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
2103 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
2104 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
2105 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
2106 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
2107 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
2108 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
2109 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
2110 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
2111 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
2112 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
2113 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
2114 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
2115 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
2116 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
2117 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
2118 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
2119 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
2122 Version 1.52.1 (2021-05-10)
2123 ============================
2125 This release disables incremental compilation, unless the user has explicitly
2126 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
2128 This is due to the widespread, and frequently occurring, breakage encountered by
2129 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
2130 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
2131 newly added incremental verification are still present in past stable versions,
2132 and are not yet fixed on any channel. These bugs can lead to miscompilation of
2135 These problems only affect incremental builds, so release builds with Cargo
2136 should not be affected unless the user has explicitly opted into incremental.
2137 Debug and check builds are affected.
2139 See [84970] for more details.
2141 [84970]: https://github.com/rust-lang/rust/issues/84970
2143 Version 1.52.0 (2021-05-06)
2144 ============================
2148 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
2149 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
2150 is allowed by default, and may become a warning or hard error in a
2152 - [You can now cast mutable references to arrays to a pointer of the same type as
2153 the element.][81479]
2157 - [Upgraded the default LLVM to LLVM 12.][81451]
2159 Added tier 3\* support for the following targets.
2161 - [`s390x-unknown-linux-musl`][82166]
2162 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
2163 - [`powerpc-unknown-openbsd`][82733]
2165 \* Refer to Rust's [platform support page][platform-support-doc] for more
2166 information on Rust's tiered platform support.
2170 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
2171 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
2172 - [`Arc<impl Error>` now implements `error::Error`.][80553]
2173 - [All integer division and remainder operations are now `const`.][80962]
2177 - [`Arguments::as_str`]
2179 - [`char::REPLACEMENT_CHARACTER`]
2180 - [`char::UNICODE_VERSION`]
2181 - [`char::decode_utf16`]
2182 - [`char::from_digit`]
2183 - [`char::from_u32_unchecked`]
2184 - [`char::from_u32`]
2185 - [`slice::partition_point`]
2186 - [`str::rsplit_once`]
2187 - [`str::split_once`]
2189 The following previously stable APIs are now `const`.
2191 - [`char::len_utf8`]
2192 - [`char::len_utf16`]
2193 - [`char::to_ascii_uppercase`]
2194 - [`char::to_ascii_lowercase`]
2195 - [`char::eq_ignore_ascii_case`]
2196 - [`u8::to_ascii_uppercase`]
2197 - [`u8::to_ascii_lowercase`]
2198 - [`u8::eq_ignore_ascii_case`]
2202 - [Rustdoc lints are now treated as a tool lint, meaning that
2203 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
2204 Using the old style is still allowed, and will become a warning in
2206 - [Rustdoc now supports argument files.][82261]
2207 - [Rustdoc now generates smart punctuation for documentation.][79423]
2208 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
2216 - [You can now pass multiple filters to tests.][81356] E.g.
2217 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
2218 - [Rustup now distributes PDB symbols for the `std` library on Windows,
2219 allowing you to see `std` symbols when debugging.][82218]
2223 These changes provide no direct user facing benefits, but represent significant
2224 improvements to the internals and overall performance of rustc and
2227 - [Check the result cache before the DepGraph when ensuring queries][81855]
2228 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
2229 - [Only store a LocalDefId in some HIR nodes][81611]
2230 - [Store HIR attributes in a side table][79519]
2234 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
2235 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
2236 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
2237 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
2238 languages in code blocks.][78429]
2239 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
2240 - [Changes in how proc macros handle whitespace may lead to panics when used
2241 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
2242 - [Turn `#[derive]` into a regular macro attribute][79078]
2244 [84136]: https://github.com/rust-lang/rust/issues/84136
2245 [80763]: https://github.com/rust-lang/rust/pull/80763
2246 [82166]: https://github.com/rust-lang/rust/pull/82166
2247 [82121]: https://github.com/rust-lang/rust/pull/82121
2248 [81879]: https://github.com/rust-lang/rust/pull/81879
2249 [82261]: https://github.com/rust-lang/rust/pull/82261
2250 [82218]: https://github.com/rust-lang/rust/pull/82218
2251 [82216]: https://github.com/rust-lang/rust/pull/82216
2252 [82202]: https://github.com/rust-lang/rust/pull/82202
2253 [81855]: https://github.com/rust-lang/rust/pull/81855
2254 [81766]: https://github.com/rust-lang/rust/pull/81766
2255 [81744]: https://github.com/rust-lang/rust/pull/81744
2256 [81611]: https://github.com/rust-lang/rust/pull/81611
2257 [81479]: https://github.com/rust-lang/rust/pull/81479
2258 [81451]: https://github.com/rust-lang/rust/pull/81451
2259 [81356]: https://github.com/rust-lang/rust/pull/81356
2260 [80962]: https://github.com/rust-lang/rust/pull/80962
2261 [80553]: https://github.com/rust-lang/rust/pull/80553
2262 [80527]: https://github.com/rust-lang/rust/pull/80527
2263 [79519]: https://github.com/rust-lang/rust/pull/79519
2264 [79423]: https://github.com/rust-lang/rust/pull/79423
2265 [79208]: https://github.com/rust-lang/rust/pull/79208
2266 [78429]: https://github.com/rust-lang/rust/pull/78429
2267 [82733]: https://github.com/rust-lang/rust/pull/82733
2268 [82594]: https://github.com/rust-lang/rust/pull/82594
2269 [79078]: https://github.com/rust-lang/rust/pull/79078
2270 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
2271 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
2272 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
2273 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
2274 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
2275 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
2276 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
2277 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
2278 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
2279 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
2280 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
2281 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
2282 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
2283 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
2284 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
2285 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
2286 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
2287 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
2288 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
2289 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
2290 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
2291 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
2293 Version 1.51.0 (2021-03-25)
2294 ============================
2298 - [You can now parameterize items such as functions, traits, and `struct`s by constant
2299 values in addition to by types and lifetimes.][79135] Also known as "const generics"
2300 E.g. you can now write the following. Note: Only values of primitive integers,
2301 `bool`, or `char` types are currently permitted.
2303 struct GenericArray<T, const LENGTH: usize> {
2307 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2308 const fn last(&self) -> Option<&T> {
2312 Some(&self.inner[LENGTH - 1])
2322 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2323 This option controls whether debug information is split across multiple files
2324 or packed into a single file. **Note** This option is unstable on other platforms.
2325 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2326 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2327 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2328 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2330 \* Refer to Rust's [platform support page][platform-support-doc] for more
2331 information on Rust's tiered platform support.
2336 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2337 - [`str` now implements `AsMut<str>`.][80279]
2338 - [`u64` and `u128` now implement `From<char>`.][79502]
2339 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2340 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2341 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2342 - [`io::Empty` now implements `io::Seek`.][78044]
2343 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2344 `T: ?Sized` types.][80764]
2345 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2351 - [`Arc::decrement_strong_count`]
2352 - [`Arc::increment_strong_count`]
2353 - [`Once::call_once_force`]
2354 - [`Peekable::next_if_eq`]
2355 - [`Peekable::next_if`]
2356 - [`Seek::stream_position`]
2357 - [`array::IntoIter`]
2358 - [`panic::panic_any`]
2360 - [`ptr::addr_of_mut!`]
2361 - [`slice::fill_with`]
2362 - [`slice::split_inclusive_mut`]
2363 - [`slice::split_inclusive`]
2364 - [`slice::strip_prefix`]
2365 - [`slice::strip_suffix`]
2366 - [`str::split_inclusive`]
2367 - [`sync::OnceState`]
2369 - [`VecDeque::range`]
2370 - [`VecDeque::range_mut`]
2374 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2375 codegen option.][cargo/9112]
2376 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2377 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2378 to avoid unifying features of dependencies where that unification could be unwanted.
2379 Such as using the same dependency with a `std` feature in a build scripts and
2380 proc-macros, while using the `no-std` feature in the final binary. See the
2381 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2386 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2387 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2388 documentation.][79642]
2390 Various improvements to intra-doc links:
2392 - [You can link to non-path primitives such as `slice`.][80181]
2393 - [You can link to associated items.][74489]
2394 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2398 - [You can now pass `--include-ignored` to tests (e.g. with
2399 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2404 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2405 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2407 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2408 for the distributed artifacts.][81521]
2409 - `armv5te-unknown-linux-gnueabi`
2410 - `sparc64-unknown-linux-gnu`
2411 - `thumbv7neon-unknown-linux-gnueabihf`
2412 - `armv7-unknown-linux-gnueabi`
2413 - `x86_64-unknown-linux-gnux32`
2414 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2419 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2421 [79135]: https://github.com/rust-lang/rust/pull/79135
2422 [74489]: https://github.com/rust-lang/rust/pull/74489
2423 [76934]: https://github.com/rust-lang/rust/pull/76934
2424 [79570]: https://github.com/rust-lang/rust/pull/79570
2425 [80181]: https://github.com/rust-lang/rust/pull/80181
2426 [79642]: https://github.com/rust-lang/rust/pull/79642
2427 [80945]: https://github.com/rust-lang/rust/pull/80945
2428 [80279]: https://github.com/rust-lang/rust/pull/80279
2429 [80053]: https://github.com/rust-lang/rust/pull/80053
2430 [79502]: https://github.com/rust-lang/rust/pull/79502
2431 [75180]: https://github.com/rust-lang/rust/pull/75180
2432 [81521]: https://github.com/rust-lang/rust/pull/81521
2433 [80968]: https://github.com/rust-lang/rust/pull/80968
2434 [80959]: https://github.com/rust-lang/rust/pull/80959
2435 [80718]: https://github.com/rust-lang/rust/pull/80718
2436 [80653]: https://github.com/rust-lang/rust/pull/80653
2437 [80579]: https://github.com/rust-lang/rust/pull/80579
2438 [79998]: https://github.com/rust-lang/rust/pull/79998
2439 [78044]: https://github.com/rust-lang/rust/pull/78044
2440 [81455]: https://github.com/rust-lang/rust/pull/81455
2441 [80764]: https://github.com/rust-lang/rust/pull/80764
2442 [80749]: https://github.com/rust-lang/rust/pull/80749
2443 [80662]: https://github.com/rust-lang/rust/pull/80662
2444 [79134]: https://github.com/rust-lang/rust/pull/79134
2445 [80966]: https://github.com/rust-lang/rust/pull/80966
2446 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2447 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2448 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2449 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2450 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2451 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2452 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2453 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2454 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2455 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2456 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2457 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2458 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2459 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2460 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2461 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2462 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2463 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2464 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2465 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2466 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2467 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2468 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2470 Version 1.50.0 (2021-02-11)
2471 ============================
2474 -----------------------
2475 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2476 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2477 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2480 -----------------------
2481 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2482 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2483 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2484 - [Dropped support for all cloudabi targets.][78439]
2486 \* Refer to Rust's [platform support page][platform-support-doc] for more
2487 information on Rust's tiered platform support.
2490 -----------------------
2492 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2493 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2494 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2495 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2496 up the same amount of space as `File`.
2502 - [`btree_map::Entry::or_insert_with_key`]
2505 - [`hash_map::Entry::or_insert_with_key`]
2509 - [`UnsafeCell::get_mut`]
2511 The following previously stable methods are now `const`.
2513 - [`IpAddr::is_ipv4`]
2514 - [`IpAddr::is_ipv6`]
2515 - [`IpAddr::is_unspecified`]
2516 - [`IpAddr::is_loopback`]
2517 - [`IpAddr::is_multicast`]
2518 - [`Ipv4Addr::octets`]
2519 - [`Ipv4Addr::is_loopback`]
2520 - [`Ipv4Addr::is_private`]
2521 - [`Ipv4Addr::is_link_local`]
2522 - [`Ipv4Addr::is_multicast`]
2523 - [`Ipv4Addr::is_broadcast`]
2524 - [`Ipv4Addr::is_documentation`]
2525 - [`Ipv4Addr::to_ipv6_compatible`]
2526 - [`Ipv4Addr::to_ipv6_mapped`]
2527 - [`Ipv6Addr::segments`]
2528 - [`Ipv6Addr::is_unspecified`]
2529 - [`Ipv6Addr::is_loopback`]
2530 - [`Ipv6Addr::is_multicast`]
2531 - [`Ipv6Addr::to_ipv4`]
2534 - [`Layout::from_size_align`]
2535 - `pow` for all integer types.
2536 - `checked_pow` for all integer types.
2537 - `saturating_pow` for all integer types.
2538 - `wrapping_pow` for all integer types.
2539 - `next_power_of_two` for all unsigned integer types.
2540 - `checked_next_power_of_two` for all unsigned integer types.
2543 -----------------------
2545 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2546 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2547 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2548 contents of that directory for changes.][cargo/8973]
2549 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2554 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2555 - [Running tests will now print the total time taken to execute.][75752]
2560 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2561 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2562 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2563 unhygenic `macro_rules!` macros.][79472]
2564 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2565 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2566 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2567 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2568 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2569 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2571 [74989]: https://github.com/rust-lang/rust/pull/74989
2572 [79261]: https://github.com/rust-lang/rust/pull/79261
2573 [79896]: https://github.com/rust-lang/rust/pull/79896
2574 [79484]: https://github.com/rust-lang/rust/pull/79484
2575 [79472]: https://github.com/rust-lang/rust/pull/79472
2576 [79270]: https://github.com/rust-lang/rust/pull/79270
2577 [79003]: https://github.com/rust-lang/rust/pull/79003
2578 [78864]: https://github.com/rust-lang/rust/pull/78864
2579 [78636]: https://github.com/rust-lang/rust/pull/78636
2580 [78439]: https://github.com/rust-lang/rust/pull/78439
2581 [78343]: https://github.com/rust-lang/rust/pull/78343
2582 [78296]: https://github.com/rust-lang/rust/pull/78296
2583 [78068]: https://github.com/rust-lang/rust/pull/78068
2584 [75752]: https://github.com/rust-lang/rust/pull/75752
2585 [74699]: https://github.com/rust-lang/rust/pull/74699
2586 [78142]: https://github.com/rust-lang/rust/pull/78142
2587 [77484]: https://github.com/rust-lang/rust/pull/77484
2588 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2589 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2590 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2591 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2592 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2593 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2594 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2595 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2596 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2597 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2598 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2599 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2600 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2601 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2602 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2603 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2604 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2605 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2606 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2607 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2608 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2609 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2610 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2611 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2612 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2613 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2614 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2615 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2616 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2617 [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
2618 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2619 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2620 [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
2621 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2624 Version 1.49.0 (2020-12-31)
2625 ============================
2628 -----------------------
2630 - [Unions can now implement `Drop`, and you can now have a field in a union
2631 with `ManuallyDrop<T>`.][77547]
2632 - [You can now cast uninhabited enums to integers.][76199]
2633 - [You can now bind by reference and by move in patterns.][76119] This
2634 allows you to selectively borrow individual components of a type. E.g.
2642 let person = Person {
2643 name: String::from("Alice"),
2647 // `name` is moved out of person, but `age` is referenced.
2648 let Person { name, ref age } = person;
2649 println!("{} {}", name, age);
2653 -----------------------
2655 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2656 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2657 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2658 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2659 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2660 - [Output from threads spawned in tests is now captured.][78227]
2661 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2663 \* Refer to Rust's [platform support page][platform-support-doc] for more
2664 information on Rust's tiered platform support.
2667 -----------------------
2669 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2670 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2675 - [`slice::select_nth_unstable`]
2676 - [`slice::select_nth_unstable_by`]
2677 - [`slice::select_nth_unstable_by_key`]
2679 The following previously stable methods are now `const`.
2681 - [`Poll::is_ready`]
2682 - [`Poll::is_pending`]
2685 -----------------------
2686 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2687 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2688 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2689 variable will be set if the crate being built is one the user selected to build, either
2690 with `-p` or through defaults.
2691 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2697 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2698 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2699 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2700 Previously such invalid or unused attributes could be ignored.
2701 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2702 read [this post about the changes][rustdoc-ws-post] for more details.
2703 - [Trait bounds are no longer inferred for associated types.][79904]
2707 These changes provide no direct user facing benefits, but represent significant
2708 improvements to the internals and overall performance of rustc and
2711 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2712 Local Storage model.][78201]
2713 - [Calculate visibilities once in resolve.][78077]
2714 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2715 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2718 [75991]: https://github.com/rust-lang/rust/pull/75991
2719 [78951]: https://github.com/rust-lang/rust/pull/78951
2720 [78848]: https://github.com/rust-lang/rust/pull/78848
2721 [78746]: https://github.com/rust-lang/rust/pull/78746
2722 [78376]: https://github.com/rust-lang/rust/pull/78376
2723 [78228]: https://github.com/rust-lang/rust/pull/78228
2724 [78227]: https://github.com/rust-lang/rust/pull/78227
2725 [78201]: https://github.com/rust-lang/rust/pull/78201
2726 [78109]: https://github.com/rust-lang/rust/pull/78109
2727 [78077]: https://github.com/rust-lang/rust/pull/78077
2728 [77997]: https://github.com/rust-lang/rust/pull/77997
2729 [77703]: https://github.com/rust-lang/rust/pull/77703
2730 [77547]: https://github.com/rust-lang/rust/pull/77547
2731 [77015]: https://github.com/rust-lang/rust/pull/77015
2732 [76199]: https://github.com/rust-lang/rust/pull/76199
2733 [76119]: https://github.com/rust-lang/rust/pull/76119
2734 [75914]: https://github.com/rust-lang/rust/pull/75914
2735 [79004]: https://github.com/rust-lang/rust/pull/79004
2736 [78676]: https://github.com/rust-lang/rust/pull/78676
2737 [79904]: https://github.com/rust-lang/rust/issues/79904
2738 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2739 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2740 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2741 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2742 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2743 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2744 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2745 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2746 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2747 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2749 Version 1.48.0 (2020-11-19)
2750 ==========================
2755 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2756 is still rejected *semantically*, but can now be parsed by procedural macros.
2760 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2761 `rustc` whether to link its own C runtime and libraries or to rely on a external
2762 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2763 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2764 Note: If you're using cargo you must explicitly pass the `--target` flag.
2765 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2767 \* Refer to Rust's [platform support page][platform-support-doc] for more
2768 information on Rust's tiered platform support.
2772 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2773 and `&Stderr`.][76275]
2774 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2775 - [The `matches!` macro now supports having a trailing comma.][74880]
2776 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2777 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2781 - [`slice::as_ptr_range`]
2782 - [`slice::as_mut_ptr_range`]
2783 - [`VecDeque::make_contiguous`]
2784 - [`future::pending`]
2787 The following previously stable methods are now `const fn`'s:
2789 - [`Option::is_some`]
2790 - [`Option::is_none`]
2791 - [`Option::as_ref`]
2793 - [`Result::is_err`]
2794 - [`Result::as_ref`]
2795 - [`Ordering::reverse`]
2796 - [`Ordering::then`]
2803 - [You can now link to items in `rustdoc` using the intra-doc link
2804 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2805 a link to `std::future`'s documentation. See ["Linking to items by
2806 name"][intradoc-links] for more information.
2807 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2808 when searching through `rustdoc`'s UI.][75740]
2812 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2813 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2814 promoted to `'static` lifetime any more inside `const fn`s.
2815 - [Associated type bindings on trait objects are now verified to meet the bounds
2816 declared on the trait when checking that they implement the trait.][27675]
2817 - [When trait bounds on associated types or opaque types are ambiguous, the
2818 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2819 - [Fixed recursive nonterminals not being expanded in macros during
2820 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2821 correctly handling recursive nonterminal tokens.
2822 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2823 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2824 in places where they have no effect.][73461]
2825 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2826 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2827 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2828 disallow zero-initialization.][71274]
2829 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2830 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2831 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2832 see the [`catch_unwind`] documentation for further information.
2838 These changes provide no direct user facing benefits, but represent significant
2839 improvements to the internals and overall performance of rustc and
2842 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2843 You can continue building with `make` by setting `ninja=false` in
2845 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2846 - [Made `ensure_sufficient_stack()` non-generic][76680]
2848 [78143]: https://github.com/rust-lang/rust/issues/78143
2849 [76680]: https://github.com/rust-lang/rust/pull/76680/
2850 [76030]: https://github.com/rust-lang/rust/pull/76030/
2851 [70212]: https://github.com/rust-lang/rust/pull/70212/
2852 [27675]: https://github.com/rust-lang/rust/issues/27675/
2853 [54121]: https://github.com/rust-lang/rust/issues/54121/
2854 [71274]: https://github.com/rust-lang/rust/pull/71274/
2855 [77386]: https://github.com/rust-lang/rust/pull/77386/
2856 [77153]: https://github.com/rust-lang/rust/pull/77153/
2857 [77055]: https://github.com/rust-lang/rust/pull/77055/
2858 [76275]: https://github.com/rust-lang/rust/pull/76275/
2859 [76310]: https://github.com/rust-lang/rust/pull/76310/
2860 [76420]: https://github.com/rust-lang/rust/pull/76420/
2861 [76158]: https://github.com/rust-lang/rust/pull/76158/
2862 [75857]: https://github.com/rust-lang/rust/pull/75857/
2863 [75585]: https://github.com/rust-lang/rust/pull/75585/
2864 [75740]: https://github.com/rust-lang/rust/pull/75740/
2865 [75502]: https://github.com/rust-lang/rust/pull/75502/
2866 [74880]: https://github.com/rust-lang/rust/pull/74880/
2867 [74922]: https://github.com/rust-lang/rust/pull/74922/
2868 [74430]: https://github.com/rust-lang/rust/pull/74430/
2869 [74194]: https://github.com/rust-lang/rust/pull/74194/
2870 [73461]: https://github.com/rust-lang/rust/pull/73461/
2871 [73166]: https://github.com/rust-lang/rust/pull/73166/
2872 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2873 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2874 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2875 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2876 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2877 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2878 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2879 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2880 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2881 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2882 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2883 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2884 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2885 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2886 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2889 Version 1.47.0 (2020-10-08)
2890 ==========================
2894 - [Closures will now warn when not used.][74869]
2898 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2899 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2901 - [Upgraded to LLVM 11.][73526]
2902 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2903 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2904 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2906 \* Refer to Rust's [platform support page][platform-support-doc] for more
2907 information on Rust's tiered platform support.
2911 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2912 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2913 those of length less than 33.][74060]
2914 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2915 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2916 `PartialEq`, and `PartialOrd`.][73583]
2920 - [`Ident::new_raw`]
2921 - [`Range::is_empty`]
2922 - [`RangeInclusive::is_empty`]
2923 - [`Result::as_deref`]
2924 - [`Result::as_deref_mut`]
2926 - [`pointer::offset_from`]
2930 The following previously stable APIs have now been made const.
2932 - [The `new` method for all `NonZero` integers.][73858]
2933 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2934 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2935 methods for all integers.][73858]
2936 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2937 signed integers.][73858]
2938 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2939 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2940 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2941 `is_ascii_control` methods for `char` and `u8`.][73858]
2945 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2946 You can override this by setting the following in your `Cargo.toml`.
2948 [profile.release.build-override]
2951 - [`cargo-help` will now display man pages for commands rather just the
2952 `--help` text.][cargo/8456]
2953 - [`cargo-metadata` now emits a `test` field indicating if a target has
2954 tests enabled.][cargo/8478]
2955 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2956 - [`cargo-publish` will now use an alternative registry by default if it's the
2957 only registry specified in `package.publish`.][cargo/8571]
2961 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2962 type based search.][75366]
2963 - [Added the Ayu theme to rustdoc.][71237]
2967 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2968 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2969 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2970 help to preserve more span information.][73084] These changes may cause
2971 compilation errors if your macro was unhygenic or didn't correctly handle
2973 - [Moved support for the CloudABI target to tier 3.][75568]
2974 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2975 - [Added the `rustc-docs` component.][75560] This allows you to install
2976 and read the documentation for the compiler internal APIs. (Currently only
2977 available for `x86_64-unknown-linux-gnu`.)
2982 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
2984 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2985 [75048]: https://github.com/rust-lang/rust/pull/75048/
2986 [74163]: https://github.com/rust-lang/rust/pull/74163/
2987 [71237]: https://github.com/rust-lang/rust/pull/71237/
2988 [74869]: https://github.com/rust-lang/rust/pull/74869/
2989 [73858]: https://github.com/rust-lang/rust/pull/73858/
2990 [75716]: https://github.com/rust-lang/rust/pull/75716/
2991 [75560]: https://github.com/rust-lang/rust/pull/75560/
2992 [75568]: https://github.com/rust-lang/rust/pull/75568/
2993 [75366]: https://github.com/rust-lang/rust/pull/75366/
2994 [75204]: https://github.com/rust-lang/rust/pull/75204/
2995 [74650]: https://github.com/rust-lang/rust/pull/74650/
2996 [74419]: https://github.com/rust-lang/rust/pull/74419/
2997 [73964]: https://github.com/rust-lang/rust/pull/73964/
2998 [74021]: https://github.com/rust-lang/rust/pull/74021/
2999 [74060]: https://github.com/rust-lang/rust/pull/74060/
3000 [73893]: https://github.com/rust-lang/rust/pull/73893/
3001 [73526]: https://github.com/rust-lang/rust/pull/73526/
3002 [73583]: https://github.com/rust-lang/rust/pull/73583/
3003 [73084]: https://github.com/rust-lang/rust/pull/73084/
3004 [73197]: https://github.com/rust-lang/rust/pull/73197/
3005 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
3006 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
3007 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
3008 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
3009 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
3010 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
3011 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
3012 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
3013 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
3014 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
3015 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
3016 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
3017 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
3018 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
3021 Version 1.46.0 (2020-08-27)
3022 ==========================
3026 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
3027 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
3028 const functions.][73862]
3029 - [The `#[track_caller]` attribute can now be added to functions to use the
3030 function's caller's location information for panic messages.][72445]
3031 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
3032 `x.0.0` over `(x.0).0`.
3033 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
3034 You currently can't use `mem::transmute` in constant functions.
3038 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
3039 - [Enabled static "Position Independent Executables" by default
3040 for `x86_64-unknown-linux-musl`.][70740]
3044 - [`mem::forget` is now a `const fn`.][73887]
3045 - [`String` now implements `From<char>`.][73466]
3046 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
3047 integer types.][73032]
3048 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
3049 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
3050 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
3051 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
3052 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
3053 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
3058 - [`vec::Drain::as_slice`]
3062 Added a number of new environment variables that are now available when
3063 compiling your crate.
3065 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
3066 the specific binary being compiled and the name of the crate.
3067 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
3068 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
3072 - [The target configuration option `abi_blacklist` has been renamed
3073 to `unsupported_abis`.][74150] The old name will still continue to work.
3074 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
3075 This was previously accepted but will become a hard error in a future release.
3076 - [Rustc will fail to compile if you have a struct with
3077 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
3079 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
3080 ensure that spans have the correct information, and may cause breakage if you
3081 were relying on receiving spans with dummy information.
3082 - [The InnoSetup installer for Windows is no longer available.][72569] This was
3083 a legacy installer that was replaced by a MSI installer a few years ago but
3084 was still being built.
3085 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
3086 - [Rustc will no longer accept overlapping trait implementations that only
3087 differ in how the lifetime was bound.][72493]
3088 - [Rustc now correctly relates the lifetime of an existential associated
3089 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
3090 you to pass a shorter lifetime than expected.
3091 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
3092 The library will need to be installed for `rustc` to work, even though we
3093 expect it to be already available on most systems.
3094 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
3096 - [Pretty printing of some tokens in procedural macros changed.][75453] The
3097 exact output returned by rustc's pretty printing is an unstable
3098 implementation detail: we recommend any macro relying on it to switch to a
3099 more robust parsing system.
3101 [75453]: https://github.com/rust-lang/rust/issues/75453/
3102 [74820]: https://github.com/rust-lang/rust/issues/74820/
3103 [74420]: https://github.com/rust-lang/rust/issues/74420/
3104 [74109]: https://github.com/rust-lang/rust/pull/74109/
3105 [74150]: https://github.com/rust-lang/rust/pull/74150/
3106 [73862]: https://github.com/rust-lang/rust/pull/73862/
3107 [73887]: https://github.com/rust-lang/rust/pull/73887/
3108 [73466]: https://github.com/rust-lang/rust/pull/73466/
3109 [73516]: https://github.com/rust-lang/rust/pull/73516/
3110 [73293]: https://github.com/rust-lang/rust/pull/73293/
3111 [73007]: https://github.com/rust-lang/rust/pull/73007/
3112 [73032]: https://github.com/rust-lang/rust/pull/73032/
3113 [72920]: https://github.com/rust-lang/rust/pull/72920/
3114 [72569]: https://github.com/rust-lang/rust/pull/72569/
3115 [72583]: https://github.com/rust-lang/rust/pull/72583/
3116 [72584]: https://github.com/rust-lang/rust/pull/72584/
3117 [72717]: https://github.com/rust-lang/rust/pull/72717/
3118 [72437]: https://github.com/rust-lang/rust/pull/72437/
3119 [72445]: https://github.com/rust-lang/rust/pull/72445/
3120 [72486]: https://github.com/rust-lang/rust/pull/72486/
3121 [72493]: https://github.com/rust-lang/rust/pull/72493/
3122 [72331]: https://github.com/rust-lang/rust/pull/72331/
3123 [71896]: https://github.com/rust-lang/rust/pull/71896/
3124 [71660]: https://github.com/rust-lang/rust/pull/71660/
3125 [71322]: https://github.com/rust-lang/rust/pull/71322/
3126 [70740]: https://github.com/rust-lang/rust/pull/70740/
3127 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
3128 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
3129 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
3130 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
3131 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
3134 Version 1.45.2 (2020-08-03)
3135 ==========================
3137 * [Fix bindings in tuple struct patterns][74954]
3138 * [Fix track_caller integration with trait objects][74784]
3140 [74954]: https://github.com/rust-lang/rust/issues/74954
3141 [74784]: https://github.com/rust-lang/rust/issues/74784
3144 Version 1.45.1 (2020-07-30)
3145 ==========================
3147 * [Fix const propagation with references.][73613]
3148 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3149 * [Avoid spurious implicit region bound.][74509]
3150 * [Install clippy on x.py install][74457]
3152 [73613]: https://github.com/rust-lang/rust/pull/73613
3153 [73078]: https://github.com/rust-lang/rust/issues/73078
3154 [74509]: https://github.com/rust-lang/rust/pull/74509
3155 [74457]: https://github.com/rust-lang/rust/pull/74457
3158 Version 1.45.0 (2020-07-16)
3159 ==========================
3163 - [Out of range float to int conversions using `as` has been defined as a saturating
3164 conversion.][71269] This was previously undefined behaviour, but you can use the
3165 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
3166 may be desirable in rare performance sensitive situations.
3167 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
3168 using `u64`.][70705]
3169 - [Function like procedural macros can now be used in expression, pattern, and statement
3170 positions.][68717] This means you can now use a function-like procedural macro
3171 anywhere you can use a declarative (`macro_rules!`) macro.
3175 - [You can now override individual target features through the `target-feature`
3176 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
3177 equivalent to `-C target-feature=+avx2,+fma`.
3178 - [Added the `force-unwind-tables` flag.][69984] This option allows
3179 rustc to always generate unwind tables regardless of panic strategy.
3180 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
3181 to include LLVM bitcode into generated `rlib`s (this is on by default).
3182 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
3183 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
3184 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
3185 - [Upgraded to LLVM 10.][67759]
3187 \* Refer to Rust's [platform support page][platform-support-doc] for more
3188 information on Rust's tiered platform support.
3193 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
3195 - [`proc_macro::TokenStream` now implements `Default`.][72234]
3196 - [You can now use `char` with
3197 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
3198 a range of codepoints.][72413] E.g.
3199 you can now write the following;
3201 for ch in 'a'..='z' {
3205 // Prints "abcdefghijklmnopqrstuvwxyz"
3207 - [`OsString` now implements `FromStr`.][71662]
3208 - [The `saturating_neg` method has been added to all signed integer primitive
3209 types, and the `saturating_abs` method has been added for all integer
3210 primitive types.][71886]
3211 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
3212 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
3214 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
3215 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
3216 integer types.][69813]
3217 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
3218 integer types.][72324]
3219 - [The `fetch_update` method has been added to all atomic integer types.][71843]
3224 - [`BTreeMap::remove_entry`]
3226 - [`rc::Weak::as_ptr`]
3227 - [`rc::Weak::from_raw`]
3228 - [`rc::Weak::into_raw`]
3229 - [`str::strip_prefix`]
3230 - [`str::strip_suffix`]
3231 - [`sync::Weak::as_ptr`]
3232 - [`sync::Weak::from_raw`]
3233 - [`sync::Weak::into_raw`]
3234 - [`char::UNICODE_VERSION`]
3235 - [`Span::resolved_at`]
3236 - [`Span::located_at`]
3237 - [`Span::mixed_site`]
3238 - [`unix::process::CommandExt::arg0`]
3243 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
3248 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
3249 `~~outdated information~~` becomes "~~outdated information~~".
3250 - [Added an emoji to Rustdoc's deprecated API message.][72014]
3254 - [Trying to self initialize a static value (that is creating a value using
3255 itself) is unsound and now causes a compile error.][71140]
3256 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
3257 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
3258 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
3259 previously undocumented and not intended for public use. Rustdoc still provides
3260 a non-zero exit code on errors.
3261 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
3262 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
3263 flags while cargo is adding `embed-bitcode` itself. The recommended way to
3264 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
3265 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
3269 - [Make clippy a git subtree instead of a git submodule][70655]
3270 - [Unify the undo log of all snapshot types][69464]
3272 [71848]: https://github.com/rust-lang/rust/issues/71848/
3273 [73420]: https://github.com/rust-lang/rust/issues/73420/
3274 [72324]: https://github.com/rust-lang/rust/pull/72324/
3275 [71843]: https://github.com/rust-lang/rust/pull/71843/
3276 [71886]: https://github.com/rust-lang/rust/pull/71886/
3277 [72234]: https://github.com/rust-lang/rust/pull/72234/
3278 [72239]: https://github.com/rust-lang/rust/pull/72239/
3279 [72397]: https://github.com/rust-lang/rust/pull/72397/
3280 [72413]: https://github.com/rust-lang/rust/pull/72413/
3281 [72014]: https://github.com/rust-lang/rust/pull/72014/
3282 [72062]: https://github.com/rust-lang/rust/pull/72062/
3283 [72094]: https://github.com/rust-lang/rust/pull/72094/
3284 [72133]: https://github.com/rust-lang/rust/pull/72133/
3285 [67759]: https://github.com/rust-lang/rust/pull/67759/
3286 [71900]: https://github.com/rust-lang/rust/pull/71900/
3287 [71928]: https://github.com/rust-lang/rust/pull/71928/
3288 [71662]: https://github.com/rust-lang/rust/pull/71662/
3289 [71716]: https://github.com/rust-lang/rust/pull/71716/
3290 [71447]: https://github.com/rust-lang/rust/pull/71447/
3291 [71269]: https://github.com/rust-lang/rust/pull/71269/
3292 [71095]: https://github.com/rust-lang/rust/pull/71095/
3293 [71140]: https://github.com/rust-lang/rust/pull/71140/
3294 [70655]: https://github.com/rust-lang/rust/pull/70655/
3295 [70705]: https://github.com/rust-lang/rust/pull/70705/
3296 [69984]: https://github.com/rust-lang/rust/pull/69984/
3297 [69813]: https://github.com/rust-lang/rust/pull/69813/
3298 [69464]: https://github.com/rust-lang/rust/pull/69464/
3299 [68717]: https://github.com/rust-lang/rust/pull/68717/
3300 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
3301 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
3302 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
3303 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
3304 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3305 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3306 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3307 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3308 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3309 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3310 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3311 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3312 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3313 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3314 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3315 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3316 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3319 Version 1.44.1 (2020-06-18)
3320 ===========================
3322 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3323 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3324 * [Fix crashes when finding backtrace on macOS.][71397]
3325 * [Clippy applies lint levels into different files.][clippy/5356]
3327 [71397]: https://github.com/rust-lang/rust/issues/71397
3328 [73078]: https://github.com/rust-lang/rust/issues/73078
3329 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3330 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3333 Version 1.44.0 (2020-06-04)
3334 ==========================
3338 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3339 - [Added the `unused_braces` lint.][70081]
3341 **Syntax-only changes**
3343 - [Expansion-driven outline module parsing][69838]
3348 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3353 These are still rejected semantically, so you will likely receive an error but
3354 these changes can be seen and parsed by macros and conditional compilation.
3358 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3359 Additionally when in incremental mode rustc defaults to 256 codegen units.
3360 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3361 a panic is thrown.][67502]
3362 - [Added tier 3\* support for the `aarch64-unknown-none` and
3363 `aarch64-unknown-none-softfloat` targets.][68334]
3364 - [Added tier 3 support for `arm64-apple-tvos` and
3365 `x86_64-apple-tvos` targets.][68191]
3370 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3371 `vec![]` to be able to be used in `const` contexts.
3372 - [`convert::Infallible` now implements `Hash`.][70281]
3373 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3374 a `&mut OsStr`.][70048]
3375 - [Unicode 13 is now supported.][69929]
3376 - [`String` now implements `From<&mut str>`.][69661]
3377 - [`IoSlice` now implements `Copy`.][69403]
3378 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3379 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3380 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3381 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3382 integer types.][69373]
3386 - [`PathBuf::with_capacity`]
3387 - [`PathBuf::capacity`]
3388 - [`PathBuf::clear`]
3389 - [`PathBuf::reserve`]
3390 - [`PathBuf::reserve_exact`]
3391 - [`PathBuf::shrink_to_fit`]
3392 - [`f32::to_int_unchecked`]
3393 - [`f64::to_int_unchecked`]
3394 - [`Layout::align_to`]
3395 - [`Layout::pad_to_align`]
3397 - [`Layout::extend`]
3401 - [Added the `cargo tree` command which will print a tree graph of
3402 your dependencies.][cargo/8062] E.g.
3404 mdbook v0.3.2 (/Users/src/rust/mdbook)
3406 │ ├── html5ever v0.24.0
3408 │ │ │ └── cfg-if v0.1.9
3410 │ │ └── markup5ever v0.9.0
3411 │ │ ├── log v0.4.8 (*)
3413 │ │ │ └── phf_shared v0.7.24
3414 │ │ │ ├── siphasher v0.2.3
3415 │ │ │ └── unicase v1.4.2
3416 │ │ │ [build-dependencies]
3417 │ │ │ └── version_check v0.1.5
3420 You can also display dependencies on multiple versions of the same crate with
3421 `cargo tree -d` (short for `cargo tree --duplicates`).
3425 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3426 the version in the sidebar.][69494]
3430 - [Rustc now correctly generates static libraries on Windows GNU targets with
3431 the `.a` extension, rather than the previous `.lib`.][70937]
3432 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3433 - [The `file_name` property in JSON output of macro errors now points the actual
3434 source file rather than the previous format of `<NAME macros>`.][70969]
3435 **Note:** this may not point to a file that actually exists on the user's system.
3436 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3437 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3438 not allow zero initialization such as `NonZeroU8`.][66059] This was
3439 previously a warning.
3440 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3441 operator has been defined as a saturating operation.][71269] This was previously
3442 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3443 continue using the current behaviour, which may be desirable in rare performance
3444 sensitive situations.
3448 These changes provide no direct user facing benefits, but represent significant
3449 improvements to the internals and overall performance of rustc and
3452 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3453 - [Replace big JS dict with JSON parsing.][71250]
3455 [69373]: https://github.com/rust-lang/rust/pull/69373/
3456 [66059]: https://github.com/rust-lang/rust/pull/66059/
3457 [68191]: https://github.com/rust-lang/rust/pull/68191/
3458 [68899]: https://github.com/rust-lang/rust/pull/68899/
3459 [71147]: https://github.com/rust-lang/rust/pull/71147/
3460 [71250]: https://github.com/rust-lang/rust/pull/71250/
3461 [70937]: https://github.com/rust-lang/rust/pull/70937/
3462 [70969]: https://github.com/rust-lang/rust/pull/70969/
3463 [70632]: https://github.com/rust-lang/rust/pull/70632/
3464 [70281]: https://github.com/rust-lang/rust/pull/70281/
3465 [70345]: https://github.com/rust-lang/rust/pull/70345/
3466 [70048]: https://github.com/rust-lang/rust/pull/70048/
3467 [70081]: https://github.com/rust-lang/rust/pull/70081/
3468 [70156]: https://github.com/rust-lang/rust/pull/70156/
3469 [71269]: https://github.com/rust-lang/rust/pull/71269/
3470 [69838]: https://github.com/rust-lang/rust/pull/69838/
3471 [69929]: https://github.com/rust-lang/rust/pull/69929/
3472 [69661]: https://github.com/rust-lang/rust/pull/69661/
3473 [69778]: https://github.com/rust-lang/rust/pull/69778/
3474 [69494]: https://github.com/rust-lang/rust/pull/69494/
3475 [69403]: https://github.com/rust-lang/rust/pull/69403/
3476 [69033]: https://github.com/rust-lang/rust/pull/69033/
3477 [68692]: https://github.com/rust-lang/rust/pull/68692/
3478 [68334]: https://github.com/rust-lang/rust/pull/68334/
3479 [67502]: https://github.com/rust-lang/rust/pull/67502/
3480 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3481 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3482 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3483 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3484 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3485 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3486 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3487 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3488 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3489 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3490 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3491 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3492 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3495 Version 1.43.1 (2020-05-07)
3496 ===========================
3498 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3499 * [Fixed the stabilization of AVX-512 features.][71473]
3500 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3502 [71430]: https://github.com/rust-lang/rust/pull/71430
3503 [71473]: https://github.com/rust-lang/rust/issues/71473
3504 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3507 Version 1.43.0 (2020-04-23)
3508 ==========================
3512 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3513 the type inferred correctly.][68129]
3514 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3516 **Syntax only changes**
3517 - [Allow `type Foo: Ord` syntactically.][69361]
3518 - [Fuse associated and extern items up to defaultness.][69194]
3519 - [Syntactically allow `self` in all `fn` contexts.][68764]
3520 - [Merge `fn` syntax + cleanup item parsing.][68728]
3521 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3522 For example, you may now write:
3524 macro_rules! mac_trait {
3534 These are still rejected *semantically*, so you will likely receive an error but
3535 these changes can be seen and parsed by macros and
3536 conditional compilation.
3541 - [You can now pass multiple lint flags to rustc to override the previous
3542 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3543 everything in the `unused` lint group except `unused-variables` which
3544 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3545 everything in the `unused` lint group **including** `unused-variables` since
3546 the allow flag is specified before the deny flag (and therefore overridden).
3547 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3548 if they are available on `windows-gnu`.][67429]
3549 - [rustc now buffers errors/warnings printed in JSON.][69227]
3553 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3554 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3555 respectively.][69538] **Note** These conversions are only available when `N`
3557 - [You can now use associated constants on floats and integers directly, rather
3558 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3559 `f32::NAN` with no imports.
3560 - [`u8::is_ascii` is now `const`.][68984]
3561 - [`String` now implements `AsMut<str>`.][68742]
3562 - [Added the `primitive` module to `std` and `core`.][67637] This module
3563 reexports Rust's primitive types. This is mainly useful in macros
3564 where you want avoid these types being shadowed.
3565 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3566 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3570 - [`Once::is_completed`]
3575 - [`iter::once_with`]
3579 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3580 your environment.][cargo/7823]
3581 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3582 executable path when running integration tests or benchmarks.][cargo/7697]
3583 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3584 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3588 - [Certain checks in the `const_err` lint were deemed unrelated to const
3589 evaluation][69185], and have been moved to the `unconditional_panic` and
3590 `arithmetic_overflow` lints.
3595 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3596 has been a warning since 1.36.0.
3597 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3598 led to some instances being accepted, and now correctly emits a hard error.
3600 [69340]: https://github.com/rust-lang/rust/pull/69340
3604 These changes provide no direct user facing benefits, but represent significant
3605 improvements to the internals and overall performance of `rustc` and
3608 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3609 - [Improved how rustc generates drop code.][67332]
3610 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3611 - [traits: preallocate 2 Vecs of known initial size][69022]
3612 - [Avoid exponential behaviour when relating types][68772]
3613 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3614 - [Improve performance of coherence checks][68966]
3615 - [Deduplicate types in the generator witness][68672]
3616 - [Invert control in struct_lint_level.][68725]
3618 [67332]: https://github.com/rust-lang/rust/pull/67332/
3619 [67429]: https://github.com/rust-lang/rust/pull/67429/
3620 [67637]: https://github.com/rust-lang/rust/pull/67637/
3621 [67642]: https://github.com/rust-lang/rust/pull/67642/
3622 [67878]: https://github.com/rust-lang/rust/pull/67878/
3623 [67885]: https://github.com/rust-lang/rust/pull/67885/
3624 [68129]: https://github.com/rust-lang/rust/pull/68129/
3625 [68672]: https://github.com/rust-lang/rust/pull/68672/
3626 [68725]: https://github.com/rust-lang/rust/pull/68725/
3627 [68728]: https://github.com/rust-lang/rust/pull/68728/
3628 [68738]: https://github.com/rust-lang/rust/pull/68738/
3629 [68742]: https://github.com/rust-lang/rust/pull/68742/
3630 [68764]: https://github.com/rust-lang/rust/pull/68764/
3631 [68772]: https://github.com/rust-lang/rust/pull/68772/
3632 [68943]: https://github.com/rust-lang/rust/pull/68943/
3633 [68952]: https://github.com/rust-lang/rust/pull/68952/
3634 [68966]: https://github.com/rust-lang/rust/pull/68966/
3635 [68984]: https://github.com/rust-lang/rust/pull/68984/
3636 [69022]: https://github.com/rust-lang/rust/pull/69022/
3637 [69185]: https://github.com/rust-lang/rust/pull/69185/
3638 [69194]: https://github.com/rust-lang/rust/pull/69194/
3639 [69201]: https://github.com/rust-lang/rust/pull/69201/
3640 [69227]: https://github.com/rust-lang/rust/pull/69227/
3641 [69548]: https://github.com/rust-lang/rust/pull/69548/
3642 [69256]: https://github.com/rust-lang/rust/pull/69256/
3643 [69361]: https://github.com/rust-lang/rust/pull/69361/
3644 [69366]: https://github.com/rust-lang/rust/pull/69366/
3645 [69538]: https://github.com/rust-lang/rust/pull/69538/
3646 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3647 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3648 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3649 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3650 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3651 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3652 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3653 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3656 Version 1.42.0 (2020-03-12)
3657 ==========================
3661 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3663 fn foo(words: &[&str]) {
3665 ["Hello", "World", "!", ..] => println!("Hello World!"),
3666 ["Foo", "Bar", ..] => println!("Baz"),
3667 rest => println!("{:?}", rest),
3671 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3672 that you can create an enum that has the exact layout and ABI of the type
3674 - [You can now use outer attribute procedural macros on inline modules.][64273]
3675 - [There are some *syntax-only* changes:][67131]
3676 - `default` is syntactically allowed before items in `trait` definitions.
3677 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3678 leave out their bodies in favor of `;`.
3679 - Bounds on associated types in `impl`s are now syntactically allowed
3680 (e.g. `type Foo: Ord;`).
3681 - `...` (the C-variadic type) may occur syntactically directly as the type of
3682 any function parameter.
3684 These are still rejected *semantically*, so you will likely receive an error
3685 but these changes can be seen and parsed by procedural macros and
3686 conditional compilation.
3690 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3691 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3692 - [`Option::{expect,unwrap}` and
3693 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3694 pointing to the location where they were called, rather than
3695 `core`'s internals. ][67887]
3697 \* Refer to Rust's [platform support page][platform-support-doc] for more
3698 information on Rust's tiered platform support.
3702 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3703 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3704 to implement `Sized`.][67935]
3705 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3706 - [`Layout::new` is now `const`.][66254]
3707 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3712 - [`CondVar::wait_while`]
3713 - [`CondVar::wait_timeout_while`]
3715 - [`DebugMap::value`]
3716 - [`ManuallyDrop::take`]
3718 - [`ptr::slice_from_raw_parts_mut`]
3719 - [`ptr::slice_from_raw_parts`]
3723 - [You no longer need to include `extern crate proc_macro;` to be able to
3724 `use proc_macro;` in the `2018` edition.][cargo/7700]
3728 - [`Error::description` has been deprecated, and its use will now produce a
3729 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3731 [68253]: https://github.com/rust-lang/rust/pull/68253/
3732 [68348]: https://github.com/rust-lang/rust/pull/68348/
3733 [67935]: https://github.com/rust-lang/rust/pull/67935/
3734 [68339]: https://github.com/rust-lang/rust/pull/68339/
3735 [68122]: https://github.com/rust-lang/rust/pull/68122/
3736 [64273]: https://github.com/rust-lang/rust/pull/64273/
3737 [67712]: https://github.com/rust-lang/rust/pull/67712/
3738 [67887]: https://github.com/rust-lang/rust/pull/67887/
3739 [67131]: https://github.com/rust-lang/rust/pull/67131/
3740 [67233]: https://github.com/rust-lang/rust/pull/67233/
3741 [66899]: https://github.com/rust-lang/rust/pull/66899/
3742 [66919]: https://github.com/rust-lang/rust/pull/66919/
3743 [66254]: https://github.com/rust-lang/rust/pull/66254/
3744 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3745 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3746 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3747 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3748 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3749 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3750 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3751 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3752 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3755 Version 1.41.1 (2020-02-27)
3756 ===========================
3758 * [Always check types of static items][69145]
3759 * [Always check lifetime bounds of `Copy` impls][69145]
3760 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3762 [69225]: https://github.com/rust-lang/rust/issues/69225
3763 [69145]: https://github.com/rust-lang/rust/pull/69145
3766 Version 1.41.0 (2020-01-30)
3767 ===========================
3772 - [You can now pass type parameters to foreign items when implementing
3773 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3774 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3775 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3776 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3777 - [You can now use any valid identifier in a `format_args` macro.][66847]
3778 Previously identifiers starting with an underscore were not allowed.
3779 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3780 enum variants.][66183] These are still rejected semantically, but
3781 can be seen and parsed by procedural macros and conditional compilation.
3782 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3783 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3784 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3786 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3791 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3792 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3793 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3794 - [You can now pass an arguments file passing the `@path` syntax
3795 to rustc.][66172] Note that the format differs somewhat from what is
3796 found in other tooling; please see [the documentation][argfile-docs] for
3798 - [You can now provide `--extern` flag without a path, indicating that it is
3799 available from the search path or specified with an `-L` flag.][64882]
3801 \* Refer to Rust's [platform support page][platform-support-doc] for more
3802 information on Rust's tiered platform support.
3804 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3809 - [The `core::panic` module is now stable.][66771] It was already stable
3811 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3812 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3813 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3818 - [`Result::map_or`]
3819 - [`Result::map_or_else`]
3820 - [`std::rc::Weak::weak_count`]
3821 - [`std::rc::Weak::strong_count`]
3822 - [`std::sync::Weak::weak_count`]
3823 - [`std::sync::Weak::strong_count`]
3828 - [Cargo will now document all the private items for binary crates
3829 by default.][cargo/7593]
3830 - [`cargo-install` will now reinstall the package if it detects that it is out
3831 of date.][cargo/7560]
3832 - [Cargo.lock now uses a more git friendly format that should help to reduce
3833 merge conflicts.][cargo/7579]
3834 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3835 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3836 optimisation level to `2` for debug builds. You can also use
3837 `[profile.<profile>.build-override]` to override build scripts and
3843 - [You can now specify `edition` in documentation code blocks to compile the block
3844 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3845 should be compiled the 2018 edition of Rust.
3846 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3847 current theme with `--check-theme`.][54733]
3848 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3853 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3854 Apple targets.][apple-32bit-drop] This means that the source code is still
3855 available to build, but the targets are no longer being tested and release
3856 binaries for those platforms will no longer be distributed by the Rust project.
3857 Please refer to the linked blog post for more information.
3859 [54733]: https://github.com/rust-lang/rust/pull/54733/
3860 [61351]: https://github.com/rust-lang/rust/pull/61351/
3861 [62514]: https://github.com/rust-lang/rust/pull/62514/
3862 [67255]: https://github.com/rust-lang/rust/pull/67255/
3863 [66661]: https://github.com/rust-lang/rust/pull/66661/
3864 [66771]: https://github.com/rust-lang/rust/pull/66771/
3865 [66847]: https://github.com/rust-lang/rust/pull/66847/
3866 [66238]: https://github.com/rust-lang/rust/pull/66238/
3867 [66277]: https://github.com/rust-lang/rust/pull/66277/
3868 [66325]: https://github.com/rust-lang/rust/pull/66325/
3869 [66172]: https://github.com/rust-lang/rust/pull/66172/
3870 [66183]: https://github.com/rust-lang/rust/pull/66183/
3871 [65879]: https://github.com/rust-lang/rust/pull/65879/
3872 [65013]: https://github.com/rust-lang/rust/pull/65013/
3873 [64882]: https://github.com/rust-lang/rust/pull/64882/
3874 [64325]: https://github.com/rust-lang/rust/pull/64325/
3875 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3876 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3877 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3878 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3879 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3880 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3881 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3882 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3883 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3884 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3885 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3887 Version 1.40.0 (2019-12-19)
3888 ===========================
3892 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3893 `const` contexts.][65188] e.g.
3896 pub struct Point(i32, i32);
3898 const ORIGIN: Point = {
3899 let constructor = Point;
3905 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3906 indicate that there may be variants or fields added in the future.][64639]
3907 For example this requires adding a wild-card branch (`_ => {}`) to any match
3908 statements on a non-exhaustive `enum`. [(RFC 2008)]
3909 - [You can now use function-like procedural macros in `extern` blocks and in
3910 type positions.][63931] e.g. `type Generated = macro!();`
3911 - [Function-like and attribute procedural macros can now emit
3912 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3913 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3914 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3915 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3919 - [Added tier 3 support\* for the
3920 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3921 - [Added tier 3 support for the
3922 `aarch64-unknown-none-softfloat` target.][64589]
3923 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3924 `mips64el-unknown-linux-muslabi64` targets.][65843]
3926 \* Refer to Rust's [platform support page][platform-support-doc] for more
3927 information on Rust's tiered platform support.
3931 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3935 - [`BTreeMap::get_key_value`]
3936 - [`HashMap::get_key_value`]
3937 - [`Option::as_deref_mut`]
3938 - [`Option::as_deref`]
3939 - [`Option::flatten`]
3940 - [`UdpSocket::peer_addr`]
3941 - [`f32::to_be_bytes`]
3942 - [`f32::to_le_bytes`]
3943 - [`f32::to_ne_bytes`]
3944 - [`f64::to_be_bytes`]
3945 - [`f64::to_le_bytes`]
3946 - [`f64::to_ne_bytes`]
3947 - [`f32::from_be_bytes`]
3948 - [`f32::from_le_bytes`]
3949 - [`f32::from_ne_bytes`]
3950 - [`f64::from_be_bytes`]
3951 - [`f64::from_le_bytes`]
3952 - [`f64::from_ne_bytes`]
3959 - [Cargo will now always display warnings, rather than only on
3960 fresh builds.][cargo/7450]
3961 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3962 now produce an error.][cargo/7507] Previously these flags were ignored.
3963 - [You can now publish `dev-dependencies` without including
3964 a `version`.][cargo/7333]
3968 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3969 when running documentation tests with `rustdoc`.][63803]
3973 - [As previously announced, any previous NLL warnings in the 2015 edition are
3974 now hard errors.][64221]
3975 - [The `include!` macro will now warn if it failed to include the
3976 entire file.][64284] The `include!` macro unintentionally only includes the
3977 first _expression_ in a file, and this can be unintuitive. This will become
3978 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3979 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3980 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3981 or `extern` blocks now correctly emits a hard error.
3983 [65294]: https://github.com/rust-lang/rust/pull/65294/
3984 [66103]: https://github.com/rust-lang/rust/pull/66103/
3985 [65843]: https://github.com/rust-lang/rust/pull/65843/
3986 [65188]: https://github.com/rust-lang/rust/pull/65188/
3987 [65092]: https://github.com/rust-lang/rust/pull/65092/
3988 [64589]: https://github.com/rust-lang/rust/pull/64589/
3989 [64639]: https://github.com/rust-lang/rust/pull/64639/
3990 [64221]: https://github.com/rust-lang/rust/pull/64221/
3991 [64284]: https://github.com/rust-lang/rust/pull/64284/
3992 [63931]: https://github.com/rust-lang/rust/pull/63931/
3993 [64035]: https://github.com/rust-lang/rust/pull/64035/
3994 [63674]: https://github.com/rust-lang/rust/pull/63674/
3995 [63803]: https://github.com/rust-lang/rust/pull/63803/
3996 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3997 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3998 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3999 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
4000 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
4001 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
4002 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
4003 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
4004 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
4005 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
4006 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
4007 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
4008 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
4009 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
4010 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
4011 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
4012 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
4013 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
4014 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
4015 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
4016 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
4017 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
4018 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
4019 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
4020 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
4023 Version 1.39.0 (2019-11-07)
4024 ===========================
4028 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
4029 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
4030 - [You can now use certain attributes on function, closure, and function pointer
4031 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
4032 `deny`, `forbid` as well as inert helper attributes used by procedural macro
4033 attributes applied to items. e.g.
4036 #[cfg(windows)] slice: &[u16],
4037 #[cfg(not(windows))] slice: &[u8],
4042 - [You can now take shared references to bind-by-move patterns in the `if` guards
4043 of `match` arms.][63118] e.g.
4046 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
4050 // ---- `nums` is bound by move.
4051 if nums.iter().sum::<u8>() == 10
4052 // ^------ `.iter()` implicitly takes a reference to `nums`.
4055 // ----------- Legal as `nums` was bound by move and so we have ownership.
4057 _ => unreachable!(),
4066 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
4067 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
4068 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
4069 **Note** Cargo currently doesn't use this feature. Refer to
4070 [cargo#7315][cargo/7315] to track this feature's progress.
4071 - [You can now pass `--show-output` argument to test binaries to print the
4072 output of successful tests.][62600]
4075 \* Refer to Rust's [platform support page][platform-support-doc] for more
4076 information on Rust's tiered platform support.
4080 - [`Vec::new` and `String::new` are now `const` functions.][64028]
4081 - [`LinkedList::new` is now a `const` function.][63684]
4082 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
4083 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
4084 now `const`.][63786]
4088 - [`Pin::into_inner`]
4089 - [`Instant::checked_duration_since`]
4090 - [`Instant::saturating_duration_since`]
4094 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
4095 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
4096 `--all` is now deprecated.
4100 - [You can now pass `-Clinker` to rustdoc to control the linker used
4101 for compiling doctests.][63834]
4105 - [Code that was previously accepted by the old borrow checker, but rejected by
4106 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
4107 previously a warning, and will also become a hard error in the Rust 2015
4108 edition in the 1.40.0 release.
4109 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
4110 run tests.][63827] This should improve performance when running a large
4112 - [The `try!` macro will now issue a deprecation warning.][62672] It is
4113 recommended to use the `?` operator instead.
4114 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
4117 [62600]: https://github.com/rust-lang/rust/pull/62600/
4118 [62672]: https://github.com/rust-lang/rust/pull/62672/
4119 [63118]: https://github.com/rust-lang/rust/pull/63118/
4120 [63209]: https://github.com/rust-lang/rust/pull/63209/
4121 [63402]: https://github.com/rust-lang/rust/pull/63402/
4122 [63565]: https://github.com/rust-lang/rust/pull/63565/
4123 [63595]: https://github.com/rust-lang/rust/pull/63595/
4124 [63684]: https://github.com/rust-lang/rust/pull/63684/
4125 [63698]: https://github.com/rust-lang/rust/pull/63698/
4126 [63770]: https://github.com/rust-lang/rust/pull/63770/
4127 [63786]: https://github.com/rust-lang/rust/pull/63786/
4128 [63827]: https://github.com/rust-lang/rust/pull/63827/
4129 [63834]: https://github.com/rust-lang/rust/pull/63834/
4130 [64010]: https://github.com/rust-lang/rust/pull/64010/
4131 [64028]: https://github.com/rust-lang/rust/pull/64028/
4132 [64334]: https://github.com/rust-lang/rust/pull/64334/
4133 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
4134 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
4135 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
4136 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
4137 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
4138 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
4140 Version 1.38.0 (2019-09-26)
4141 ==========================
4145 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
4146 - [The `#[deprecated]` attribute can now be used on macros.][62042]
4150 - [Added pipelined compilation support to `rustc`.][62766] This will
4151 improve compilation times in some cases. For further information please refer
4152 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
4153 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
4154 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
4155 `x86_64-uwp-windows-msvc` targets.][60260]
4156 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
4157 `armv7-unknown-linux-musleabi` targets.][63107]
4158 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
4159 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
4160 - [Upgraded to LLVM 9.][62592]
4162 \* Refer to Rust's [platform support page][platform-support-doc] for more
4163 information on Rust's tiered platform support.
4167 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
4168 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
4169 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
4170 is available at `std::clone::Clone`). This also makes all built-in macros
4171 available in `std`/`core` root. e.g. `std::include_bytes!`.
4172 - [`str::Chars` now implements `Debug`.][63000]
4173 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
4174 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
4175 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
4176 - [Added euclidean remainder and division operations (`div_euclid`,
4177 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
4178 `overflowing`, and `wrapping` versions are available for all
4180 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
4181 `PartialEq`.][61491]
4182 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
4186 - [`<*const T>::cast`]
4187 - [`<*mut T>::cast`]
4188 - [`Duration::as_secs_f32`]
4189 - [`Duration::as_secs_f64`]
4190 - [`Duration::div_f32`]
4191 - [`Duration::div_f64`]
4192 - [`Duration::from_secs_f32`]
4193 - [`Duration::from_secs_f64`]
4194 - [`Duration::mul_f32`]
4195 - [`Duration::mul_f64`]
4196 - [`any::type_name`]
4200 - [Added pipelined compilation support to `cargo`.][cargo/7143]
4201 - [You can now pass the `--features` option multiple times to enable
4202 multiple features.][cargo/7084]
4207 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
4211 - [`rustc` will now warn about some incorrect uses of
4212 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
4216 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
4218 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
4219 issues][62896] with certain crates such as libc.
4221 [60260]: https://github.com/rust-lang/rust/pull/60260/
4222 [61457]: https://github.com/rust-lang/rust/pull/61457/
4223 [61491]: https://github.com/rust-lang/rust/pull/61491/
4224 [61884]: https://github.com/rust-lang/rust/pull/61884/
4225 [61953]: https://github.com/rust-lang/rust/pull/61953/
4226 [62042]: https://github.com/rust-lang/rust/pull/62042/
4227 [62528]: https://github.com/rust-lang/rust/pull/62528/
4228 [62583]: https://github.com/rust-lang/rust/pull/62583/
4229 [62735]: https://github.com/rust-lang/rust/pull/62735/
4230 [62766]: https://github.com/rust-lang/rust/pull/62766/
4231 [62784]: https://github.com/rust-lang/rust/pull/62784/
4232 [62592]: https://github.com/rust-lang/rust/pull/62592/
4233 [62785]: https://github.com/rust-lang/rust/issues/62785/
4234 [62814]: https://github.com/rust-lang/rust/pull/62814/
4235 [62896]: https://github.com/rust-lang/rust/issues/62896/
4236 [63000]: https://github.com/rust-lang/rust/pull/63000/
4237 [63056]: https://github.com/rust-lang/rust/pull/63056/
4238 [63107]: https://github.com/rust-lang/rust/pull/63107/
4239 [63346]: https://github.com/rust-lang/rust/pull/63346/
4240 [63421]: https://github.com/rust-lang/rust/pull/63421/
4241 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
4242 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
4243 [63048]: https://github.com/rust-lang/rust/pull/63048
4244 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4245 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4246 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
4247 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
4248 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
4249 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
4250 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
4251 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
4252 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
4253 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
4254 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
4255 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
4256 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
4258 Version 1.37.0 (2019-08-15)
4259 ==========================
4263 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
4264 [`Box`][62228], or an [array][62235] and unused.
4265 - [You can now use the `cfg` and `cfg_attr` attributes on
4266 generic parameters.][61547]
4267 - [You can now use enum variants through type alias.][61682] e.g. You can
4268 write the following:
4270 type MyOption = Option<u8>;
4272 fn increment_or_zero(x: MyOption) -> u8 {
4274 MyOption::Some(y) => y + 1,
4275 MyOption::None => 0,
4279 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
4280 `const _: u32 = 5;`.
4281 - [You can now use `#[repr(align(X)]` on enums.][61229]
4282 - [The `?` Kleene macro operator is now available in the
4283 2015 edition.][60932]
4287 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
4288 and `-C profile-use` flags.][61268] For more information on how to use profile
4289 guided optimization, please refer to the [rustc book][rustc-book-pgo].
4290 - [The `rust-lldb` wrapper script should now work again.][61827]
4294 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
4298 - [`BufReader::buffer`]
4299 - [`BufWriter::buffer`]
4300 - [`Cell::from_mut`]
4301 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
4302 - [`DoubleEndedIterator::nth_back`]
4304 - [`Wrapping::reverse_bits`]
4305 - [`i128::reverse_bits`]
4306 - [`i16::reverse_bits`]
4307 - [`i32::reverse_bits`]
4308 - [`i64::reverse_bits`]
4309 - [`i8::reverse_bits`]
4310 - [`isize::reverse_bits`]
4311 - [`slice::copy_within`]
4312 - [`u128::reverse_bits`]
4313 - [`u16::reverse_bits`]
4314 - [`u32::reverse_bits`]
4315 - [`u64::reverse_bits`]
4316 - [`u8::reverse_bits`]
4317 - [`usize::reverse_bits`]
4321 - [`Cargo.lock` files are now included by default when publishing executable crates
4322 with executables.][cargo/7026]
4323 - [You can now specify `default-run="foo"` in `[package]` to specify the
4324 default executable to use for `cargo run`.][cargo/7056]
4331 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4332 Please transition your code to using the `..=` syntax for inclusive
4334 - [Using a trait object without the `dyn` will now warn by default.][61203]
4335 Please transition your code to use `dyn Trait` for trait objects instead.
4337 [62228]: https://github.com/rust-lang/rust/pull/62228/
4338 [62235]: https://github.com/rust-lang/rust/pull/62235/
4339 [61802]: https://github.com/rust-lang/rust/pull/61802/
4340 [61827]: https://github.com/rust-lang/rust/pull/61827/
4341 [61547]: https://github.com/rust-lang/rust/pull/61547/
4342 [61682]: https://github.com/rust-lang/rust/pull/61682/
4343 [61268]: https://github.com/rust-lang/rust/pull/61268/
4344 [61342]: https://github.com/rust-lang/rust/pull/61342/
4345 [61347]: https://github.com/rust-lang/rust/pull/61347/
4346 [61100]: https://github.com/rust-lang/rust/pull/61100/
4347 [61203]: https://github.com/rust-lang/rust/pull/61203/
4348 [61229]: https://github.com/rust-lang/rust/pull/61229/
4349 [60932]: https://github.com/rust-lang/rust/pull/60932/
4350 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4351 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4352 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4353 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4354 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4355 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4356 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4357 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4358 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4359 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4360 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4361 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4362 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4363 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4364 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4365 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4366 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4367 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4368 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4369 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4370 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4371 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4372 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4375 Version 1.36.0 (2019-07-04)
4376 ==========================
4380 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4381 - [The order of traits in trait objects no longer affects the semantics of that
4382 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4383 `dyn fmt::Debug + Send`, where this was previously not the case.
4387 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4388 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4389 - [`mem::needs_drop` is now available as a const fn.][60364]
4390 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4391 - [`String` now implements `BorrowMut<str>`.][60404]
4392 - [`io::Cursor` now implements `Default`.][60234]
4393 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4394 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4395 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4396 environment has access to heap memory allocation.
4397 - [`String` now implements `From<&String>`.][59825]
4398 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4399 return a tuple of each argument when there is multiple arguments.
4400 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4405 - [`VecDeque::rotate_left`]
4406 - [`VecDeque::rotate_right`]
4407 - [`Iterator::copied`]
4409 - [`io::IoSliceMut`]
4410 - [`Read::read_vectored`]
4411 - [`Write::write_vectored`]
4412 - [`str::as_mut_ptr`]
4413 - [`mem::MaybeUninit`]
4414 - [`pointer::align_offset`]
4415 - [`future::Future`]
4417 - [`task::RawWaker`]
4418 - [`task::RawWakerVTable`]
4424 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4425 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4427 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4431 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4438 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4439 longer recommended, and will be deprecated in 1.39.0.
4441 [60318]: https://github.com/rust-lang/rust/pull/60318/
4442 [60364]: https://github.com/rust-lang/rust/pull/60364/
4443 [60370]: https://github.com/rust-lang/rust/pull/60370/
4444 [60404]: https://github.com/rust-lang/rust/pull/60404/
4445 [60234]: https://github.com/rust-lang/rust/pull/60234/
4446 [60244]: https://github.com/rust-lang/rust/pull/60244/
4447 [58623]: https://github.com/rust-lang/rust/pull/58623/
4448 [59648]: https://github.com/rust-lang/rust/pull/59648/
4449 [59675]: https://github.com/rust-lang/rust/pull/59675/
4450 [59825]: https://github.com/rust-lang/rust/pull/59825/
4451 [59826]: https://github.com/rust-lang/rust/pull/59826/
4452 [59445]: https://github.com/rust-lang/rust/pull/59445/
4453 [59114]: https://github.com/rust-lang/rust/pull/59114/
4454 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4455 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4456 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4457 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4458 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4459 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4460 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4461 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4462 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4463 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4464 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4465 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4466 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4467 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4468 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4469 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4470 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4471 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4472 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4473 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4476 Version 1.35.0 (2019-05-23)
4477 ==========================
4481 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4482 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4483 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4485 unsafe fn call_unsafe(func: unsafe fn()) {
4490 unsafe { call_unsafe(|| {}); }
4497 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4498 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4499 - [Added the `wasm32-unknown-wasi` target.][59464]
4504 - [`Thread` will now show its ID in `Debug` output.][59460]
4505 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4506 - [`alloc::System` now implements `Default`.][59451]
4507 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4509 - [`char::{ToLowercase, ToUppercase}` now
4510 implement `ExactSizeIterator`.][58778]
4511 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4512 - [Removed the `Read` trait bounds
4513 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4514 - [You can now call the `dbg!` macro without any parameters to print the file
4515 and line where it is called.][57847]
4516 - [In place ASCII case conversions are now up to 4× faster.][59283]
4517 e.g. `str::make_ascii_lowercase`
4518 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4525 - [`RefCell::replace_with`]
4526 - [`RefCell::map_split`]
4528 - [`Range::contains`]
4529 - [`RangeFrom::contains`]
4530 - [`RangeTo::contains`]
4531 - [`RangeInclusive::contains`]
4532 - [`RangeToInclusive::contains`]
4533 - [`Option::copied`]
4537 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4538 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4543 - [The Rust toolchain is now available natively for musl based distros.][58575]
4545 [59460]: https://github.com/rust-lang/rust/pull/59460/
4546 [59464]: https://github.com/rust-lang/rust/pull/59464/
4547 [59500]: https://github.com/rust-lang/rust/pull/59500/
4548 [59512]: https://github.com/rust-lang/rust/pull/59512/
4549 [59580]: https://github.com/rust-lang/rust/pull/59580/
4550 [59283]: https://github.com/rust-lang/rust/pull/59283/
4551 [59451]: https://github.com/rust-lang/rust/pull/59451/
4552 [59076]: https://github.com/rust-lang/rust/pull/59076/
4553 [58778]: https://github.com/rust-lang/rust/pull/58778/
4554 [58717]: https://github.com/rust-lang/rust/pull/58717/
4555 [58369]: https://github.com/rust-lang/rust/pull/58369/
4556 [58423]: https://github.com/rust-lang/rust/pull/58423/
4557 [58080]: https://github.com/rust-lang/rust/pull/58080/
4558 [57847]: https://github.com/rust-lang/rust/pull/57847/
4559 [58575]: https://github.com/rust-lang/rust/pull/58575
4560 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4561 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4562 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4563 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4564 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4565 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4566 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4567 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4568 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4569 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4570 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4571 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4573 Version 1.34.2 (2019-05-14)
4574 ===========================
4576 * [Destabilize the `Error::type_id` function due to a security
4577 vulnerability][60785] ([CVE-2019-12083])
4579 [60785]: https://github.com/rust-lang/rust/pull/60785
4580 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4582 Version 1.34.1 (2019-04-25)
4583 ===========================
4585 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4586 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4587 * [Fix Clippy panic when checking some macros][clippy/3805]
4589 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4590 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4591 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4593 Version 1.34.0 (2019-04-11)
4594 ==========================
4598 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4599 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4601 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4602 `#[attr{}]` procedural macros.][57367]
4603 - [You can now write `extern crate self as foo;`][57407] to import your
4604 crate's root into the extern prelude.
4609 - [You can now target `riscv64imac-unknown-none-elf` and
4610 `riscv64gc-unknown-none-elf`.][58406]
4611 - [You can now enable linker plugin LTO optimisations with
4612 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4613 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4615 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4620 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4621 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4622 the `Hash` trait to create an iterator.
4623 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4624 methods.][58421] Most notably you no longer require the `Ord` trait to create
4626 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4627 for all numeric types.][58044]
4628 - [Indexing a `str` is now generic over all types that
4629 implement `SliceIndex<str>`.][57604]
4630 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4631 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4632 produce a warning if their returning type is unused.
4633 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4634 `overflowing_pow` are now available for all numeric types.][57873] These are
4635 equivalent to methods such as `wrapping_add` for the `pow` operation.
4643 * [`Error::type_id`]
4644 * [`atomic::AtomicI16`]
4645 * [`atomic::AtomicI32`]
4646 * [`atomic::AtomicI64`]
4647 * [`atomic::AtomicI8`]
4648 * [`atomic::AtomicU16`]
4649 * [`atomic::AtomicU32`]
4650 * [`atomic::AtomicU64`]
4651 * [`atomic::AtomicU8`]
4652 * [`convert::Infallible`]
4653 * [`convert::TryFrom`]
4654 * [`convert::TryInto`]
4656 * [`iter::successors`]
4657 * [`num::NonZeroI128`]
4658 * [`num::NonZeroI16`]
4659 * [`num::NonZeroI32`]
4660 * [`num::NonZeroI64`]
4661 * [`num::NonZeroI8`]
4662 * [`num::NonZeroIsize`]
4663 * [`slice::sort_by_cached_key`]
4664 * [`str::escape_debug`]
4665 * [`str::escape_default`]
4666 * [`str::escape_unicode`]
4667 * [`str::split_ascii_whitespace`]
4670 * [`Instant::checked_add`]
4671 * [`Instant::checked_sub`]
4672 * [`SystemTime::checked_add`]
4673 * [`SystemTime::checked_sub`]
4677 - [You can now use alternative registries to crates.io.][cargo/6654]
4681 - [You can now use the `?` operator in your documentation tests without manually
4682 adding `fn main() -> Result<(), _> {}`.][56470]
4686 - [`Command::before_exec` is being replaced by the unsafe method
4687 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4688 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4689 can now use `const` functions in `static` variables.
4691 [58370]: https://github.com/rust-lang/rust/pull/58370/
4692 [58406]: https://github.com/rust-lang/rust/pull/58406/
4693 [58421]: https://github.com/rust-lang/rust/pull/58421/
4694 [58166]: https://github.com/rust-lang/rust/pull/58166/
4695 [58044]: https://github.com/rust-lang/rust/pull/58044/
4696 [58057]: https://github.com/rust-lang/rust/pull/58057/
4697 [58059]: https://github.com/rust-lang/rust/pull/58059/
4698 [57809]: https://github.com/rust-lang/rust/pull/57809/
4699 [57873]: https://github.com/rust-lang/rust/pull/57873/
4700 [57604]: https://github.com/rust-lang/rust/pull/57604/
4701 [57367]: https://github.com/rust-lang/rust/pull/57367/
4702 [57407]: https://github.com/rust-lang/rust/pull/57407/
4703 [57425]: https://github.com/rust-lang/rust/pull/57425/
4704 [57106]: https://github.com/rust-lang/rust/pull/57106/
4705 [56470]: https://github.com/rust-lang/rust/pull/56470/
4706 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4707 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4708 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4709 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4710 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4711 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4712 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4713 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4714 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4715 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4716 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4717 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4718 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4719 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4720 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4721 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4722 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4723 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4724 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4725 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4726 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4727 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4728 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4729 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4730 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4731 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4732 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4733 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4734 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4735 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4736 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4739 Version 1.33.0 (2019-02-28)
4740 ==========================
4744 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4745 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4746 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4747 E.g. You can have match statement on a `u8` that covers `0..=255` and
4748 you would no longer be required to have a `_ => unreachable!()` case.
4749 - [You can now have multiple patterns in `if let` and `while let`
4750 expressions.][57532] You can do this with the same syntax as a `match`
4760 let state = Creature::Crab("Ferris");
4762 if let Creature::Crab(name) | Creature::Person(name) = state {
4763 println!("This creature's name is: {}", name);
4767 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4768 this feature will by default produce a warning as this behaviour can be
4769 unintuitive. E.g. `if let _ = 5 {}`
4770 - [You can now use `let` bindings, assignments, expression statements,
4771 and irrefutable pattern destructuring in const functions.][57175]
4772 - [You can now call unsafe const functions.][57067] E.g.
4774 const unsafe fn foo() -> i32 { 5 }
4775 const fn bar() -> i32 {
4779 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4780 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4781 - [You can now specify a specific alignment with the `#[repr(packed)]`
4782 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4783 with an alignment of 2 bytes and a size of 6 bytes.
4784 - [You can now import an item from a module as an `_`.][56303] This allows you to
4785 import a trait's impls, and not have the name in the namespace. E.g.
4787 use std::io::Read as _;
4789 // Allowed as there is only one `Read` in the module.
4792 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4796 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4797 command line argument.][56351]
4798 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4799 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4800 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4801 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4802 information on Rust's platform support.
4803 - [Added support for the `thumbv7neon-linux-androideabi` and
4804 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4805 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4809 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4810 functions for all numeric types.][57566]
4811 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4812 are now `const` functions for all numeric types.][57105]
4813 - [The methods `is_positive` and `is_negative` are now `const` functions for
4814 all signed numeric types.][57105]
4815 - [The `get` method for all `NonZero` types is now `const`.][57167]
4816 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4817 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4818 numeric types.][57234]
4819 - [`Ipv4Addr::new` is now a `const` function][57234]
4823 - [`unix::FileExt::read_exact_at`]
4824 - [`unix::FileExt::write_all_at`]
4825 - [`Option::transpose`]
4826 - [`Result::transpose`]
4827 - [`convert::identity`]
4830 - [`marker::PhantomPinned`]
4831 - [`Vec::resize_with`]
4832 - [`VecDeque::resize_with`]
4833 - [`Duration::as_millis`]
4834 - [`Duration::as_micros`]
4835 - [`Duration::as_nanos`]
4840 - [You can now publish crates that require a feature flag to compile with
4841 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4842 - [Cargo should now rebuild a crate if a file was modified during the initial
4847 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4848 are now deprecated in the standard library, and their usage will now produce a warning.
4849 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4851 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4853 - [Libtest no longer creates a new thread for each test when
4854 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4856 [56243]: https://github.com/rust-lang/rust/pull/56243
4857 [56303]: https://github.com/rust-lang/rust/pull/56303/
4858 [56351]: https://github.com/rust-lang/rust/pull/56351/
4859 [56362]: https://github.com/rust-lang/rust/pull/56362
4860 [56642]: https://github.com/rust-lang/rust/pull/56642/
4861 [56769]: https://github.com/rust-lang/rust/pull/56769/
4862 [56805]: https://github.com/rust-lang/rust/pull/56805
4863 [56947]: https://github.com/rust-lang/rust/pull/56947/
4864 [57049]: https://github.com/rust-lang/rust/pull/57049/
4865 [57067]: https://github.com/rust-lang/rust/pull/57067/
4866 [57105]: https://github.com/rust-lang/rust/pull/57105
4867 [57130]: https://github.com/rust-lang/rust/pull/57130/
4868 [57167]: https://github.com/rust-lang/rust/pull/57167/
4869 [57175]: https://github.com/rust-lang/rust/pull/57175/
4870 [57234]: https://github.com/rust-lang/rust/pull/57234/
4871 [57332]: https://github.com/rust-lang/rust/pull/57332/
4872 [57465]: https://github.com/rust-lang/rust/pull/57465/
4873 [57532]: https://github.com/rust-lang/rust/pull/57532/
4874 [57535]: https://github.com/rust-lang/rust/pull/57535/
4875 [57566]: https://github.com/rust-lang/rust/pull/57566/
4876 [57615]: https://github.com/rust-lang/rust/pull/57615/
4877 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4878 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4879 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4880 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4881 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4882 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4883 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4884 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4885 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4886 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4887 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4888 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4889 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4890 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4891 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4892 [platform-support]: https://forge.rust-lang.org/platform-support.html
4894 Version 1.32.0 (2019-01-17)
4895 ==========================
4900 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4901 operator allows you to specify zero or one repetitions similar to the `*` and
4903 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4904 now always resolve to the item (`enum`, `struct`, etc.) available in the
4905 module if present, before resolving to a external crate or an item the prelude.][56759]
4908 enum Color { Red, Green, Blue }
4914 - [You can now match against `PhantomData<T>` types.][55837]
4915 - [You can now match against literals in macros with the `literal`
4916 specifier.][56072] This will match against a literal of any type.
4917 E.g. `1`, `'A'`, `"Hello World"`
4918 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4920 struct Point(i32, i32);
4923 pub fn new(x: i32, y: i32) -> Self {
4927 pub fn is_origin(&self) -> bool {
4935 - [Self can also now be used in type definitions.][56366] E.g.
4939 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4942 Cons(T, Box<Self>) // likewise here
4945 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4946 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4950 - [The default allocator has changed from jemalloc to the default allocator on
4951 your system.][55238] The compiler itself on Linux & macOS will still use
4952 jemalloc, but programs compiled with it will use the system allocator.
4953 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4957 - [`PathBuf` now implements `FromStr`.][55148]
4958 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4959 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4960 easily debug expressions in your rust program. E.g.
4963 let b = dbg!(a * 2) + 1;
4964 // ^-- prints: [src/main.rs:4] a * 2 = 4
4968 The following APIs are now `const` functions and can be used in a
4972 - [`UnsafeCell::get`]
4973 - [`char::is_ascii`]
4975 - [`ManuallyDrop::new`]
4976 - [`ManuallyDrop::into_inner`]
4977 - [`RangeInclusive::start`]
4978 - [`RangeInclusive::end`]
4979 - [`NonNull::as_ptr`]
4982 - [`Duration::as_secs`]
4983 - [`Duration::subsec_millis`]
4984 - [`Duration::subsec_micros`]
4985 - [`Duration::subsec_nanos`]
4987 - [`Ipv4Addr::is_unspecified`]
4989 - [`Ipv6Addr::octets`]
4993 - [`i8::to_be_bytes`]
4994 - [`i8::to_le_bytes`]
4995 - [`i8::to_ne_bytes`]
4996 - [`i8::from_be_bytes`]
4997 - [`i8::from_le_bytes`]
4998 - [`i8::from_ne_bytes`]
4999 - [`i16::to_be_bytes`]
5000 - [`i16::to_le_bytes`]
5001 - [`i16::to_ne_bytes`]
5002 - [`i16::from_be_bytes`]
5003 - [`i16::from_le_bytes`]
5004 - [`i16::from_ne_bytes`]
5005 - [`i32::to_be_bytes`]
5006 - [`i32::to_le_bytes`]
5007 - [`i32::to_ne_bytes`]
5008 - [`i32::from_be_bytes`]
5009 - [`i32::from_le_bytes`]
5010 - [`i32::from_ne_bytes`]
5011 - [`i64::to_be_bytes`]
5012 - [`i64::to_le_bytes`]
5013 - [`i64::to_ne_bytes`]
5014 - [`i64::from_be_bytes`]
5015 - [`i64::from_le_bytes`]
5016 - [`i64::from_ne_bytes`]
5017 - [`i128::to_be_bytes`]
5018 - [`i128::to_le_bytes`]
5019 - [`i128::to_ne_bytes`]
5020 - [`i128::from_be_bytes`]
5021 - [`i128::from_le_bytes`]
5022 - [`i128::from_ne_bytes`]
5023 - [`isize::to_be_bytes`]
5024 - [`isize::to_le_bytes`]
5025 - [`isize::to_ne_bytes`]
5026 - [`isize::from_be_bytes`]
5027 - [`isize::from_le_bytes`]
5028 - [`isize::from_ne_bytes`]
5029 - [`u8::to_be_bytes`]
5030 - [`u8::to_le_bytes`]
5031 - [`u8::to_ne_bytes`]
5032 - [`u8::from_be_bytes`]
5033 - [`u8::from_le_bytes`]
5034 - [`u8::from_ne_bytes`]
5035 - [`u16::to_be_bytes`]
5036 - [`u16::to_le_bytes`]
5037 - [`u16::to_ne_bytes`]
5038 - [`u16::from_be_bytes`]
5039 - [`u16::from_le_bytes`]
5040 - [`u16::from_ne_bytes`]
5041 - [`u32::to_be_bytes`]
5042 - [`u32::to_le_bytes`]
5043 - [`u32::to_ne_bytes`]
5044 - [`u32::from_be_bytes`]
5045 - [`u32::from_le_bytes`]
5046 - [`u32::from_ne_bytes`]
5047 - [`u64::to_be_bytes`]
5048 - [`u64::to_le_bytes`]
5049 - [`u64::to_ne_bytes`]
5050 - [`u64::from_be_bytes`]
5051 - [`u64::from_le_bytes`]
5052 - [`u64::from_ne_bytes`]
5053 - [`u128::to_be_bytes`]
5054 - [`u128::to_le_bytes`]
5055 - [`u128::to_ne_bytes`]
5056 - [`u128::from_be_bytes`]
5057 - [`u128::from_le_bytes`]
5058 - [`u128::from_ne_bytes`]
5059 - [`usize::to_be_bytes`]
5060 - [`usize::to_le_bytes`]
5061 - [`usize::to_ne_bytes`]
5062 - [`usize::from_be_bytes`]
5063 - [`usize::from_le_bytes`]
5064 - [`usize::from_ne_bytes`]
5068 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
5069 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
5073 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
5077 - [The argument types for AVX's
5078 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
5079 been changed from `*const` to `*mut` as the previous implementation
5083 [55148]: https://github.com/rust-lang/rust/pull/55148/
5084 [55238]: https://github.com/rust-lang/rust/pull/55238/
5085 [55280]: https://github.com/rust-lang/rust/pull/55280/
5086 [55610]: https://github.com/rust-lang/rust/pull/55610/
5087 [55663]: https://github.com/rust-lang/rust/pull/55663/
5088 [55702]: https://github.com/rust-lang/rust/pull/55702/
5089 [55837]: https://github.com/rust-lang/rust/pull/55837/
5090 [55843]: https://github.com/rust-lang/rust/pull/55843/
5091 [56072]: https://github.com/rust-lang/rust/pull/56072/
5092 [56245]: https://github.com/rust-lang/rust/pull/56245/
5093 [56365]: https://github.com/rust-lang/rust/pull/56365/
5094 [56366]: https://github.com/rust-lang/rust/pull/56366/
5095 [56395]: https://github.com/rust-lang/rust/pull/56395/
5096 [56759]: https://github.com/rust-lang/rust/pull/56759/
5097 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
5098 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
5099 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
5100 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
5101 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
5102 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5103 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5104 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
5105 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
5106 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
5107 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
5108 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
5109 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
5110 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
5111 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
5112 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
5113 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
5114 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
5115 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
5116 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
5117 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
5118 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
5119 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
5120 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
5121 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
5122 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
5123 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
5124 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
5125 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
5126 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
5127 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
5128 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
5129 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
5130 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
5131 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
5132 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
5133 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
5134 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
5135 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
5136 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
5137 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
5138 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
5139 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
5140 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
5141 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
5142 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
5143 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
5144 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
5145 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
5146 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
5147 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
5148 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
5149 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
5150 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
5151 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
5152 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
5153 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
5154 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
5155 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
5156 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
5157 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
5158 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
5159 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
5160 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
5161 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
5162 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
5163 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
5164 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
5165 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
5166 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
5167 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
5168 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
5169 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
5170 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
5171 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
5172 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
5173 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
5174 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
5175 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
5176 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
5177 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
5178 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
5179 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
5180 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
5181 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
5182 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
5183 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
5184 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
5185 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
5186 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
5187 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
5188 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
5189 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
5192 Version 1.31.1 (2018-12-20)
5193 ===========================
5195 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
5196 - [Fix broken go-to-definition in RLS][rls/1171]
5197 - [Fix infinite loop on hover in RLS][rls/1170]
5199 [56562]: https://github.com/rust-lang/rust/pull/56562
5200 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
5201 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
5203 Version 1.31.0 (2018-12-06)
5204 ==========================
5208 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
5209 - [New lifetime elision rules now allow for eliding lifetimes in functions and
5210 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
5211 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
5213 - [You can now define and use `const` functions.][54835] These are currently
5214 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
5215 [language reference][const-reference] for what exactly is available.
5216 - [You can now use tool lints, which allow you to scope lints from external
5217 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
5218 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
5219 a crate, not just in exported functions.][54451]
5220 - [You can now use parentheses in pattern matches.][54497]
5224 - [Updated musl to 1.1.20][54430]
5228 - [You can now convert `num::NonZero*` types to their raw equivalents using the
5229 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
5230 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
5231 into `Option<&mut T>` using the `From` trait.][53218]
5232 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
5237 - [`slice::align_to`]
5238 - [`slice::align_to_mut`]
5239 - [`slice::chunks_exact`]
5240 - [`slice::chunks_exact_mut`]
5241 - [`slice::rchunks`]
5242 - [`slice::rchunks_mut`]
5243 - [`slice::rchunks_exact`]
5244 - [`slice::rchunks_exact_mut`]
5245 - [`Option::replace`]
5249 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
5250 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
5251 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
5253 [52813]: https://github.com/rust-lang/rust/pull/52813/
5254 [53218]: https://github.com/rust-lang/rust/pull/53218/
5255 [54057]: https://github.com/rust-lang/rust/pull/54057/
5256 [54240]: https://github.com/rust-lang/rust/pull/54240/
5257 [54430]: https://github.com/rust-lang/rust/pull/54430/
5258 [54451]: https://github.com/rust-lang/rust/pull/54451/
5259 [54497]: https://github.com/rust-lang/rust/pull/54497/
5260 [54778]: https://github.com/rust-lang/rust/pull/54778/
5261 [54835]: https://github.com/rust-lang/rust/pull/54835/
5262 [54870]: https://github.com/rust-lang/rust/pull/54870/
5263 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
5264 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
5265 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
5266 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
5267 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
5268 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
5269 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5270 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
5271 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5272 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
5273 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
5274 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
5275 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
5276 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
5278 Version 1.30.1 (2018-11-08)
5279 ===========================
5281 - [Fixed overflow ICE in rustdoc][54199]
5282 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
5284 [54199]: https://github.com/rust-lang/rust/pull/54199
5285 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
5287 Version 1.30.0 (2018-10-25)
5288 ==========================
5292 - [Procedural macros are now available.][52081] These kinds of macros allow for
5293 more powerful code generation. There is a [new chapter available][proc-macros]
5294 in the Rust Programming Language book that goes further in depth.
5295 - [You can now use keywords as identifiers using the raw identifiers
5296 syntax (`r#`),][53236] e.g. `let r#for = true;`
5297 - [Using anonymous parameters in traits is now deprecated with a warning and
5298 will be a hard error in the 2018 edition.][53272]
5299 - [You can now use `crate` in paths.][54404] This allows you to refer to the
5300 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
5301 - [Using a external crate no longer requires being prefixed with `::`.][54404]
5302 Previously, using a external crate in a module without a use statement
5303 required `let json = ::serde_json::from_str(foo);` but can now be written
5304 as `let json = serde_json::from_str(foo);`.
5305 - [You can now apply the `#[used]` attribute to static items to prevent the
5306 compiler from optimising them away, even if they appear to be unused,][51363]
5307 e.g. `#[used] static FOO: u32 = 1;`
5308 - [You can now import and reexport macros from other crates with the `use`
5309 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5310 the root module of the crate. If your macro relies on calling other local
5311 macros, it is recommended to export with the
5312 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5314 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5315 using the `vis` specifier.][53370]
5316 - [Non-macro attributes now allow all forms of literals, not just
5317 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5318 write `#[attr(true)]`.
5319 - [You can now specify a function to handle a panic in the Rust runtime with the
5320 `#[panic_handler]` attribute.][51366]
5324 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5325 - [Added the `aarch64-unknown-netbsd` target][53165]
5326 - [Upgraded to LLVM 8.][53611]
5330 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5334 - [`Ipv4Addr::BROADCAST`]
5335 - [`Ipv4Addr::LOCALHOST`]
5336 - [`Ipv4Addr::UNSPECIFIED`]
5337 - [`Ipv6Addr::LOCALHOST`]
5338 - [`Ipv6Addr::UNSPECIFIED`]
5339 - [`Iterator::find_map`]
5341 The following methods are replacement methods for `trim_left`, `trim_right`,
5342 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5344 - [`str::trim_end_matches`]
5346 - [`str::trim_start_matches`]
5347 - [`str::trim_start`]
5351 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5352 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5353 equivalent to calling `rustdoc --error-format=json`.
5354 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5358 - [`rustdoc` allows you to specify what edition to treat your code as with the
5359 `--edition` option.][54057]
5360 - [`rustdoc` now has the `--color` (specify whether to output color) and
5361 `--error-format` (specify error format, e.g. `json`) options.][53003]
5362 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5363 debug symbols.][53774]
5364 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5365 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5367 [50911]: https://github.com/rust-lang/rust/pull/50911/
5368 [51363]: https://github.com/rust-lang/rust/pull/51363/
5369 [51366]: https://github.com/rust-lang/rust/pull/51366/
5370 [52081]: https://github.com/rust-lang/rust/pull/52081/
5371 [53003]: https://github.com/rust-lang/rust/pull/53003/
5372 [53033]: https://github.com/rust-lang/rust/pull/53033/
5373 [53044]: https://github.com/rust-lang/rust/pull/53044/
5374 [53165]: https://github.com/rust-lang/rust/pull/53165/
5375 [53611]: https://github.com/rust-lang/rust/pull/53611/
5376 [53236]: https://github.com/rust-lang/rust/pull/53236/
5377 [53272]: https://github.com/rust-lang/rust/pull/53272/
5378 [53370]: https://github.com/rust-lang/rust/pull/53370/
5379 [53459]: https://github.com/rust-lang/rust/pull/53459/
5380 [53774]: https://github.com/rust-lang/rust/pull/53774/
5381 [53822]: https://github.com/rust-lang/rust/pull/53822/
5382 [54057]: https://github.com/rust-lang/rust/pull/54057/
5383 [54404]: https://github.com/rust-lang/rust/pull/54404/
5384 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5385 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5386 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5387 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5389 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5390 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5391 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5392 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5393 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5394 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5395 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5396 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5397 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5398 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5401 Version 1.29.2 (2018-10-11)
5402 ===========================
5404 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5405 - The `rls-preview` component on the windows-gnu targets has been restored.
5407 [54639]: https://github.com/rust-lang/rust/pull/54639
5410 Version 1.29.1 (2018-09-25)
5411 ===========================
5416 - The standard library's `str::repeat` function contained an out of bounds write
5417 caused by an integer overflow. This has been fixed by deterministically
5418 panicking when an overflow happens.
5420 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5424 Version 1.29.0 (2018-09-13)
5425 ==========================
5429 - [Bumped minimum LLVM version to 5.0.][51899]
5430 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5431 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5432 - [Upgraded to LLVM 7.][51966]
5436 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5437 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5438 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5439 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5441 - [`Cell<T>` now allows `T` to be unsized.][50494]
5442 - [`SocketAddr` is now stable on Redox.][52656]
5447 - [`Iterator::flatten`]
5452 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5453 `--locked` to disable this behavior.
5454 - [`cargo-install` will now allow you to cross compile an install
5455 using `--target`.][cargo/5614]
5456 - [Added the `cargo-fix` subcommand to automatically move project code from
5457 2015 edition to 2018.][cargo/5723]
5458 - [`cargo doc` can now optionally document private types using the
5459 `--document-private-items` flag.][cargo/5543]
5463 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5464 the specified level to that level.][52354] For example `--cap-lints warn`
5465 will demote `deny` and `forbid` lints to `warn`.
5466 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5467 fails and `101` if there is a panic.][52197]
5468 - [A preview of clippy has been made available through rustup.][51122]
5469 You can install the preview with `rustup component add clippy-preview`.
5473 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5474 Use `str::get_unchecked(begin..end)` instead.
5475 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5476 Consider using the `home_dir` function from
5477 https://crates.io/crates/dirs instead.
5478 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5479 - [`cfg` attributes and `--cfg` command line flags are now more
5480 strictly validated.][53893]
5482 [53893]: https://github.com/rust-lang/rust/pull/53893/
5483 [52861]: https://github.com/rust-lang/rust/pull/52861/
5484 [51966]: https://github.com/rust-lang/rust/pull/51966/
5485 [52656]: https://github.com/rust-lang/rust/pull/52656/
5486 [52239]: https://github.com/rust-lang/rust/pull/52239/
5487 [52330]: https://github.com/rust-lang/rust/pull/52330/
5488 [52354]: https://github.com/rust-lang/rust/pull/52354/
5489 [52402]: https://github.com/rust-lang/rust/pull/52402/
5490 [52197]: https://github.com/rust-lang/rust/pull/52197/
5491 [51807]: https://github.com/rust-lang/rust/pull/51807/
5492 [51899]: https://github.com/rust-lang/rust/pull/51899/
5493 [51912]: https://github.com/rust-lang/rust/pull/51912/
5494 [51619]: https://github.com/rust-lang/rust/pull/51619/
5495 [51656]: https://github.com/rust-lang/rust/pull/51656/
5496 [51178]: https://github.com/rust-lang/rust/pull/51178/
5497 [51122]: https://github.com/rust-lang/rust/pull/51122
5498 [50494]: https://github.com/rust-lang/rust/pull/50494/
5499 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5500 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5501 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5502 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5503 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5504 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5505 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5508 Version 1.28.0 (2018-08-02)
5509 ===========================
5513 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5514 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5515 the inner type across Foreign Function Interface (FFI) boundaries.
5516 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5517 and can now be used as identifiers.][51196]
5518 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5519 stable.][51241] This will allow users to specify a global allocator for
5521 - [Unit test functions marked with the `#[test]` attribute can now return
5522 `Result<(), E: Debug>` in addition to `()`.][51298]
5523 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5524 allows macros to easily target lifetimes.
5528 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5529 prioritise making smaller binary sizes. `z` is the same as `s` with the
5530 exception that it does not vectorise loops, which typically results in an even
5532 - [The short error format is now stable.][49546] Specified with
5533 `--error-format=short` this option will provide a more compressed output of
5534 rust error messages.
5535 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5536 - [Reduced the number of allocations in the macro parser.][50855] This can
5537 improve compile times of macro heavy crates on average by 5%.
5541 - [Implemented `Default` for `&mut str`.][51306]
5542 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5543 - [Implemented `Extend` for `()`.][50234]
5544 - [The `Debug` implementation of `time::Duration` should now be more easily
5545 human readable.][50364] Previously a `Duration` of one second would printed as
5546 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5547 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5548 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5549 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5550 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5551 for `PathBuf`.][50170]
5552 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5553 and `Wrapping<i128>`.][50465]
5554 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5555 possible.][51050] This can provide up to a 40% speed increase.
5556 - [Improved error messages when using `format!`.][50610]
5560 - [`Iterator::step_by`]
5561 - [`Path::ancestors`]
5562 - [`SystemTime::UNIX_EPOCH`]
5563 - [`alloc::GlobalAlloc`]
5565 - [`alloc::LayoutErr`]
5568 - [`alloc::alloc_zeroed`]
5569 - [`alloc::dealloc`]
5570 - [`alloc::realloc`]
5571 - [`alloc::handle_alloc_error`]
5572 - [`btree_map::Entry::or_default`]
5573 - [`fmt::Alignment`]
5574 - [`hash_map::Entry::or_default`]
5575 - [`iter::repeat_with`]
5576 - [`num::NonZeroUsize`]
5577 - [`num::NonZeroU128`]
5578 - [`num::NonZeroU16`]
5579 - [`num::NonZeroU32`]
5580 - [`num::NonZeroU64`]
5581 - [`num::NonZeroU8`]
5582 - [`ops::RangeBounds`]
5583 - [`slice::SliceIndex`]
5584 - [`slice::from_mut`]
5585 - [`slice::from_ref`]
5586 - [`{Any + Send + Sync}::downcast_mut`]
5587 - [`{Any + Send + Sync}::downcast_ref`]
5588 - [`{Any + Send + Sync}::is`]
5592 - [Cargo will now no longer allow you to publish crates with build scripts that
5593 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5594 considered to be immutable.
5598 - [The `suggestion_applicability` field in `rustc`'s json output is now
5599 stable.][50486] This will allow dev tools to check whether a code suggestion
5600 would apply to them.
5604 - [Rust will consider trait objects with duplicated constraints to be the same
5605 type as without the duplicated constraint.][51276] For example the below code will
5606 now fail to compile.
5611 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5614 impl Trait + Send + Send {
5615 fn test(&self) { println!("two"); }
5619 [49546]: https://github.com/rust-lang/rust/pull/49546/
5620 [50143]: https://github.com/rust-lang/rust/pull/50143/
5621 [50170]: https://github.com/rust-lang/rust/pull/50170/
5622 [50234]: https://github.com/rust-lang/rust/pull/50234/
5623 [50265]: https://github.com/rust-lang/rust/pull/50265/
5624 [50364]: https://github.com/rust-lang/rust/pull/50364/
5625 [50385]: https://github.com/rust-lang/rust/pull/50385/
5626 [50465]: https://github.com/rust-lang/rust/pull/50465/
5627 [50486]: https://github.com/rust-lang/rust/pull/50486/
5628 [50554]: https://github.com/rust-lang/rust/pull/50554/
5629 [50610]: https://github.com/rust-lang/rust/pull/50610/
5630 [50855]: https://github.com/rust-lang/rust/pull/50855/
5631 [51050]: https://github.com/rust-lang/rust/pull/51050/
5632 [51196]: https://github.com/rust-lang/rust/pull/51196/
5633 [51241]: https://github.com/rust-lang/rust/pull/51241/
5634 [51276]: https://github.com/rust-lang/rust/pull/51276/
5635 [51298]: https://github.com/rust-lang/rust/pull/51298/
5636 [51306]: https://github.com/rust-lang/rust/pull/51306/
5637 [51562]: https://github.com/rust-lang/rust/pull/51562/
5638 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5639 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5640 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5641 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5642 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5643 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5644 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5645 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5646 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5647 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5648 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5649 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5650 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5651 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5652 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5653 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5654 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5655 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5656 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5657 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5658 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5659 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5660 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5661 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5662 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5663 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5664 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5665 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5666 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5667 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5669 Version 1.27.2 (2018-07-20)
5670 ===========================
5675 - The borrow checker was fixed to avoid potential unsoundness when using
5676 match ergonomics: [#52213][52213].
5678 [52213]: https://github.com/rust-lang/rust/issues/52213
5680 Version 1.27.1 (2018-07-10)
5681 ===========================
5686 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5687 when running, which enabled executing code as some other user on a
5688 given machine. This release fixes that vulnerability; you can read
5689 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5691 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5696 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5697 match ergonomics: [#51415][51415], [#49534][49534].
5699 [51415]: https://github.com/rust-lang/rust/issues/51415
5700 [49534]: https://github.com/rust-lang/rust/issues/49534
5701 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5702 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5704 Version 1.27.0 (2018-06-21)
5705 ==========================
5709 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5710 be used as an identifier.
5711 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5712 bare `Trait` syntax, and should make it clearer when being used in tandem with
5713 `impl Trait` because it is equivalent to the following syntax:
5714 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5715 `Box<Trait> == Box<dyn Trait>`.
5716 - [Attributes on generic parameters such as types and lifetimes are
5717 now stable.][48851] e.g.
5718 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5719 - [The `#[must_use]` attribute can now also be used on functions as well as
5720 types.][48925] It provides a lint that by default warns users when the
5721 value returned by a function has not been used.
5725 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5729 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5730 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5731 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5732 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5733 the `cfg` attribute.
5734 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5735 std are now available in core.][49896]
5736 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5738 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5739 that the operation isn't done in place.
5740 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5741 the `#[must_use]` attribute][49533] to warn about unused potentially
5742 expensive allocations.
5746 - [`DoubleEndedIterator::rfind`]
5747 - [`DoubleEndedIterator::rfold`]
5748 - [`DoubleEndedIterator::try_rfold`]
5749 - [`Duration::from_micros`]
5750 - [`Duration::from_nanos`]
5751 - [`Duration::subsec_micros`]
5752 - [`Duration::subsec_millis`]
5753 - [`HashMap::remove_entry`]
5754 - [`Iterator::try_fold`]
5755 - [`Iterator::try_for_each`]
5757 - [`Option::filter`]
5758 - [`String::replace_range`]
5759 - [`Take::set_limit`]
5760 - [`hint::unreachable_unchecked`]
5761 - [`os::unix::process::parent_id`]
5762 - [`ptr::swap_nonoverlapping`]
5763 - [`slice::rsplit_mut`]
5765 - [`slice::swap_with_slice`]
5769 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5770 `readme`, and `repository` fields.][cargo/5386]
5771 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5772 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5773 a different directory than `target` for placing compilation artifacts.
5774 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5775 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5776 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5777 where cargo would infer a binary, Cargo will produce a warning. You can
5778 disable this feature ahead of time by setting any of the following to false:
5779 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5780 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5781 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5785 - [Added “The Rustc book” into the official documentation.][49707]
5786 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5787 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5791 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5792 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5793 compile, `"".is_empty()` will still compile.
5794 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5795 will only print the inner type.][48553] E.g.
5796 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5797 not `AtomicBool(true)`.
5798 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5799 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5800 alignment should cover all use cases.
5801 - The `.description()` method on the `std::error::Error` trait
5802 [has been soft-deprecated][50163]. It is no longer required to implement it.
5804 [48553]: https://github.com/rust-lang/rust/pull/48553/
5805 [48851]: https://github.com/rust-lang/rust/pull/48851/
5806 [48925]: https://github.com/rust-lang/rust/pull/48925/
5807 [49533]: https://github.com/rust-lang/rust/pull/49533/
5808 [49623]: https://github.com/rust-lang/rust/pull/49623/
5809 [49630]: https://github.com/rust-lang/rust/pull/49630/
5810 [49664]: https://github.com/rust-lang/rust/pull/49664/
5811 [49699]: https://github.com/rust-lang/rust/pull/49699/
5812 [49707]: https://github.com/rust-lang/rust/pull/49707/
5813 [49896]: https://github.com/rust-lang/rust/pull/49896/
5814 [49968]: https://github.com/rust-lang/rust/pull/49968/
5815 [50163]: https://github.com/rust-lang/rust/pull/50163
5816 [50177]: https://github.com/rust-lang/rust/pull/50177/
5817 [50378]: https://github.com/rust-lang/rust/pull/50378/
5818 [50423]: https://github.com/rust-lang/rust/pull/50423/
5819 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5820 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5821 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5822 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5823 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5824 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5825 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5826 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5827 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5828 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5829 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5830 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5831 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5832 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5833 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5834 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5835 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5836 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5837 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5838 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5839 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5840 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5841 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5842 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5843 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5844 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5845 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5846 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5847 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5850 Version 1.26.2 (2018-06-05)
5851 ==========================
5856 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5858 [51117]: https://github.com/rust-lang/rust/issues/51117
5861 Version 1.26.1 (2018-05-29)
5862 ==========================
5867 - [RLS now works on Windows.][50646]
5868 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5874 - [`fn main() -> impl Trait` no longer works for non-Termination
5876 This reverts an accidental stabilization.
5877 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5878 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5880 [50646]: https://github.com/rust-lang/rust/issues/50646
5881 [50656]: https://github.com/rust-lang/rust/pull/50656
5882 [50812]: https://github.com/rust-lang/rust/pull/50812
5883 [50950]: https://github.com/rust-lang/rust/issues/50950
5884 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5886 Version 1.26.0 (2018-05-10)
5887 ==========================
5891 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5892 implement either or both traits.][49299]
5893 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5894 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5895 lifetime can be elided.][49458]
5896 - [`impl Trait` is now stable allowing you to have abstract types in returns
5897 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5898 `fn open(path: impl AsRef<Path>)`.
5899 - [Pattern matching will now automatically apply dereferences.][49394]
5900 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5901 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5902 - [A lot of operations are now available in a const context.][46882] E.g. You
5903 can now index into constant arrays, reference and dereference into constants,
5904 and use tuple struct constructors.
5905 - [Fixed entry slice patterns are now stable.][48516] E.g.
5907 let points = [1, 2, 3, 4];
5909 [1, 2, 3, 4] => println!("All points were sequential."),
5910 _ => println!("Not all points were sequential."),
5917 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5918 - [Fixed exponential projection complexity on nested types.][48296]
5919 This can provide up to a ~12% reduction in compile times for certain crates.
5920 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5921 to remap path prefixes outputted by the compiler.
5922 - [Added `powerpc-unknown-netbsd` target.][48281]
5926 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5927 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5928 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5929 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5930 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5931 - [`ascii::escape_default` is now available in libcore.][48735]
5932 - [Trailing commas are now supported in std and core macros.][48056]
5933 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5934 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5939 - [`*const T::copy_to_nonoverlapping`]
5940 - [`*const T::copy_to`]
5941 - [`*const T::read_unaligned`]
5942 - [`*const T::read_volatile`]
5943 - [`*const T::read`]
5945 - [`*const T::wrapping_add`]
5946 - [`*const T::wrapping_sub`]
5948 - [`*mut T::copy_to_nonoverlapping`]
5949 - [`*mut T::copy_to`]
5950 - [`*mut T::read_unaligned`]
5951 - [`*mut T::read_volatile`]
5953 - [`*mut T::replace`]
5956 - [`*mut T::wrapping_add`]
5957 - [`*mut T::wrapping_sub`]
5958 - [`*mut T::write_bytes`]
5959 - [`*mut T::write_unaligned`]
5960 - [`*mut T::write_volatile`]
5963 - [`FromUtf8Error::as_bytes`]
5964 - [`LocalKey::try_with`]
5965 - [`Option::cloned`]
5966 - [`btree_map::Entry::and_modify`]
5967 - [`fs::read_to_string`]
5970 - [`hash_map::Entry::and_modify`]
5971 - [`iter::FusedIterator`]
5972 - [`ops::RangeInclusive`]
5973 - [`ops::RangeToInclusive`]
5975 - [`slice::rotate_left`]
5976 - [`slice::rotate_right`]
5977 - [`String::retain`]
5982 - [Cargo will now output path to custom commands when `-v` is
5983 passed with `--list`][cargo/5041]
5984 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5988 - [The second edition of "The Rust Programming Language" book is now recommended
5989 over the first.][48404]
5994 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5995 syntax is now invalid.
5997 use std::ops::Fn as dyn;
5998 fn g(_: Box<dyn(std::fmt::Debug)>) {}
6000 - [The result of dereferences are no longer promoted to `'static`.][47408]
6004 const PAIR: &(i32, i32) = &(0, 1);
6005 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
6008 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
6009 - [`".e0"` will now no longer parse as `0.0` and will instead cause
6011 - [Removed hoedown from rustdoc.][48274]
6012 - [Bounds on higher-kinded lifetimes a hard error.][48326]
6014 [46882]: https://github.com/rust-lang/rust/pull/46882
6015 [47379]: https://github.com/rust-lang/rust/pull/47379
6016 [47408]: https://github.com/rust-lang/rust/pull/47408
6017 [47813]: https://github.com/rust-lang/rust/pull/47813
6018 [48056]: https://github.com/rust-lang/rust/pull/48056
6019 [48125]: https://github.com/rust-lang/rust/pull/48125
6020 [48235]: https://github.com/rust-lang/rust/pull/48235
6021 [48274]: https://github.com/rust-lang/rust/pull/48274
6022 [48281]: https://github.com/rust-lang/rust/pull/48281
6023 [48296]: https://github.com/rust-lang/rust/pull/48296
6024 [48326]: https://github.com/rust-lang/rust/pull/48326
6025 [48359]: https://github.com/rust-lang/rust/pull/48359
6026 [48404]: https://github.com/rust-lang/rust/pull/48404
6027 [48481]: https://github.com/rust-lang/rust/pull/48481
6028 [48516]: https://github.com/rust-lang/rust/pull/48516
6029 [48628]: https://github.com/rust-lang/rust/pull/48628
6030 [48629]: https://github.com/rust-lang/rust/pull/48629
6031 [48657]: https://github.com/rust-lang/rust/pull/48657
6032 [48735]: https://github.com/rust-lang/rust/pull/48735
6033 [48978]: https://github.com/rust-lang/rust/pull/48978
6034 [49101]: https://github.com/rust-lang/rust/pull/49101
6035 [49109]: https://github.com/rust-lang/rust/pull/49109
6036 [49162]: https://github.com/rust-lang/rust/pull/49162
6037 [49255]: https://github.com/rust-lang/rust/pull/49255
6038 [49299]: https://github.com/rust-lang/rust/pull/49299
6039 [49305]: https://github.com/rust-lang/rust/pull/49305
6040 [49394]: https://github.com/rust-lang/rust/pull/49394
6041 [49458]: https://github.com/rust-lang/rust/pull/49458
6042 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
6043 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
6044 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
6045 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
6046 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
6047 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
6048 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
6049 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
6050 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
6051 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
6052 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
6053 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
6054 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
6055 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
6056 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
6057 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
6058 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
6059 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
6060 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
6061 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
6062 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
6063 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
6064 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
6065 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
6066 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
6067 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
6068 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
6069 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
6070 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
6071 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
6072 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
6073 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
6074 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
6075 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
6076 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
6077 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
6078 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
6079 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
6080 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
6081 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
6082 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
6083 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
6086 Version 1.25.0 (2018-03-29)
6087 ==========================
6091 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
6092 - [You can now use nested groups of imports.][47948]
6093 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
6094 - [You can now have `|` at the start of a match arm.][47947] e.g.
6096 enum Foo { A, B, C }
6102 | Foo::B => println!("AB"),
6103 | Foo::C => println!("C"),
6110 - [Upgraded to LLVM 6.][47828]
6111 - [Added `-C lto=val` option.][47521]
6112 - [Added `i586-unknown-linux-musl` target][47282]
6116 - [Impl Send for `process::Command` on Unix.][47760]
6117 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
6118 - [`UnsafeCell::into_inner` is now safe.][47204]
6119 - [Implement libstd for CloudABI.][47268]
6120 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
6121 - [Implement `AsRef<Path>` for Component][46985]
6122 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
6123 - [Moved `Duration` to libcore.][46666]
6127 - [`Location::column`]
6130 The following functions can now be used in a constant expression.
6131 eg. `static MINUTE: Duration = Duration::from_secs(60);`
6132 - [`Duration::new`][47300]
6133 - [`Duration::from_secs`][47300]
6134 - [`Duration::from_millis`][47300]
6138 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
6139 - [`cargo new` now defaults to creating a binary crate, instead of a
6140 library crate.][cargo/5029]
6144 - [Rust by example is now shipped with new releases][46196]
6148 - [Deprecated `net::lookup_host`.][47510]
6149 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
6150 - The borrow checker was sometimes incorrectly permitting overlapping borrows
6151 around indexing operations (see [#47349][47349]). This has been fixed (which also
6152 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
6153 - [Removed deprecated unstable attribute `#[simd]`.][47251]
6155 [33903]: https://github.com/rust-lang/rust/pull/33903
6156 [47947]: https://github.com/rust-lang/rust/pull/47947
6157 [47948]: https://github.com/rust-lang/rust/pull/47948
6158 [47760]: https://github.com/rust-lang/rust/pull/47760
6159 [47790]: https://github.com/rust-lang/rust/pull/47790
6160 [47828]: https://github.com/rust-lang/rust/pull/47828
6161 [47398]: https://github.com/rust-lang/rust/pull/47398
6162 [47510]: https://github.com/rust-lang/rust/pull/47510
6163 [47521]: https://github.com/rust-lang/rust/pull/47521
6164 [47204]: https://github.com/rust-lang/rust/pull/47204
6165 [47251]: https://github.com/rust-lang/rust/pull/47251
6166 [47268]: https://github.com/rust-lang/rust/pull/47268
6167 [47282]: https://github.com/rust-lang/rust/pull/47282
6168 [47300]: https://github.com/rust-lang/rust/pull/47300
6169 [47349]: https://github.com/rust-lang/rust/pull/47349
6170 [46931]: https://github.com/rust-lang/rust/pull/46931
6171 [46985]: https://github.com/rust-lang/rust/pull/46985
6172 [47006]: https://github.com/rust-lang/rust/pull/47006
6173 [46830]: https://github.com/rust-lang/rust/pull/46830
6174 [46095]: https://github.com/rust-lang/rust/pull/46095
6175 [46666]: https://github.com/rust-lang/rust/pull/46666
6176 [46196]: https://github.com/rust-lang/rust/pull/46196
6177 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
6178 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
6179 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
6180 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
6181 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
6184 Version 1.24.1 (2018-03-01)
6185 ==========================
6187 - [Do not abort when unwinding through FFI][48251]
6188 - [Emit UTF-16 files for linker arguments on Windows][48318]
6189 - [Make the error index generator work again][48308]
6190 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
6192 [48251]: https://github.com/rust-lang/rust/issues/48251
6193 [48308]: https://github.com/rust-lang/rust/issues/48308
6194 [48318]: https://github.com/rust-lang/rust/issues/48318
6195 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
6198 Version 1.24.0 (2018-02-15)
6199 ==========================
6203 - [External `sysv64` ffi is now available.][46528]
6204 eg. `extern "sysv64" fn foo () {}`
6208 - [rustc now uses 16 codegen units by default for release builds.][46910]
6209 For the fastest builds, utilize `codegen-units=1`.
6210 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
6211 - [Add `aarch64-unknown-openbsd` support][46760]
6215 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
6216 improvement in performance in the majority of cases.
6217 - [`OsStr`'s `Debug` implementation is now lossless and consistent
6218 with Windows.][46798]
6219 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
6220 - [impl `From<bool>` for `AtomicBool`][46293]
6221 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
6222 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
6223 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
6224 - [float::from_bits now just uses transmute.][46012] This provides
6225 some optimisations from LLVM.
6226 - [Copied `AsciiExt` methods onto `char`][46077]
6227 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
6228 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
6229 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
6230 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
6234 - [`RefCell::replace`]
6236 - [`atomic::spin_loop_hint`]
6238 The following functions can now be used in a constant expression.
6239 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
6241 - [`AtomicBool::new`][46287]
6242 - [`AtomicUsize::new`][46287]
6243 - [`AtomicIsize::new`][46287]
6244 - [`AtomicPtr::new`][46287]
6245 - [`Cell::new`][46287]
6246 - [`{integer}::min_value`][46287]
6247 - [`{integer}::max_value`][46287]
6248 - [`mem::size_of`][46287]
6249 - [`mem::align_of`][46287]
6250 - [`ptr::null`][46287]
6251 - [`ptr::null_mut`][46287]
6252 - [`RefCell::new`][46287]
6253 - [`UnsafeCell::new`][46287]
6257 - [Added a `workspace.default-members` config that
6258 overrides implied `--all` in virtual workspaces.][cargo/4743]
6259 - [Enable incremental by default on development builds.][cargo/4817] Also added
6260 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
6261 per-project or global basis respectively.
6268 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
6269 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
6270 in accordance with IETF RFC 4291 §2.2.
6271 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
6272 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
6273 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
6274 - [Leading zeros in tuple struct members is now an error][47084]
6275 - [`column!()` macro is one-based instead of zero-based][46977]
6276 - [`fmt::Arguments` can no longer be shared across threads][45198]
6277 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
6278 - [Cargo sets a different working directory for the compiler][cargo/4788]
6280 [44884]: https://github.com/rust-lang/rust/pull/44884
6281 [45198]: https://github.com/rust-lang/rust/pull/45198
6282 [45506]: https://github.com/rust-lang/rust/pull/45506
6283 [45990]: https://github.com/rust-lang/rust/pull/45990
6284 [46012]: https://github.com/rust-lang/rust/pull/46012
6285 [46077]: https://github.com/rust-lang/rust/pull/46077
6286 [46094]: https://github.com/rust-lang/rust/pull/46094
6287 [46284]: https://github.com/rust-lang/rust/pull/46284
6288 [46287]: https://github.com/rust-lang/rust/pull/46287
6289 [46293]: https://github.com/rust-lang/rust/pull/46293
6290 [46528]: https://github.com/rust-lang/rust/pull/46528
6291 [46671]: https://github.com/rust-lang/rust/pull/46671
6292 [46713]: https://github.com/rust-lang/rust/pull/46713
6293 [46735]: https://github.com/rust-lang/rust/pull/46735
6294 [46760]: https://github.com/rust-lang/rust/pull/46760
6295 [46798]: https://github.com/rust-lang/rust/pull/46798
6296 [46828]: https://github.com/rust-lang/rust/pull/46828
6297 [46831]: https://github.com/rust-lang/rust/pull/46831
6298 [46833]: https://github.com/rust-lang/rust/pull/46833
6299 [46910]: https://github.com/rust-lang/rust/pull/46910
6300 [46977]: https://github.com/rust-lang/rust/pull/46977
6301 [47018]: https://github.com/rust-lang/rust/pull/47018
6302 [47080]: https://github.com/rust-lang/rust/pull/47080
6303 [47084]: https://github.com/rust-lang/rust/pull/47084
6304 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6305 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6306 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6307 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6308 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6309 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6312 Version 1.23.0 (2018-01-04)
6313 ==========================
6317 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6318 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6319 Which should fix some confusing errors in some operations.
6323 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6324 undefined behavior.][45920]
6325 - [rustc now suggests renaming import if names clash.][45660]
6326 - [Display errors/warnings correctly when there are zero-width or
6327 wide characters.][45711]
6328 - [rustc now avoids unnecessary copies of arguments that are
6329 simple bindings][45380] This should improve memory usage on average by 5-10%.
6330 - [Updated musl used to build musl rustc to 1.1.17][45393]
6334 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6335 - [Implement Hash for raw pointers to unsized types][45483]
6336 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6337 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6338 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6339 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6340 and `<*mut T>::as_mut`][44932]
6341 - [Optimized `Thread::{park, unpark}` implementation][45524]
6342 - [Improved `SliceExt::binary_search` performance.][45333]
6343 - [impl `FromIterator<()>` for `()`][45379]
6344 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6352 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6353 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6354 - [Added unit test checking to `cargo check`][cargo/4592]
6355 - [Cargo now lets you install a specific version
6356 using `cargo install --version`][cargo/4637]
6360 - [Releases now ship with the Cargo book documentation.][45692]
6361 - [rustdoc now prints rendering warnings on every run.][45324]
6365 - [Changes have been made to type equality to make it more correct,
6366 in rare cases this could break some code.][45853] [Tracking issue for
6367 further information][45852]
6368 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6369 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6370 Android 9, the minimum supported version is Android 14.
6371 - [Bumped the minimum LLVM to 3.9][45326]
6373 [44042]: https://github.com/rust-lang/rust/pull/44042
6374 [44932]: https://github.com/rust-lang/rust/pull/44932
6375 [45267]: https://github.com/rust-lang/rust/pull/45267
6376 [45324]: https://github.com/rust-lang/rust/pull/45324
6377 [45326]: https://github.com/rust-lang/rust/pull/45326
6378 [45333]: https://github.com/rust-lang/rust/pull/45333
6379 [45379]: https://github.com/rust-lang/rust/pull/45379
6380 [45380]: https://github.com/rust-lang/rust/pull/45380
6381 [45393]: https://github.com/rust-lang/rust/pull/45393
6382 [45435]: https://github.com/rust-lang/rust/pull/45435
6383 [45483]: https://github.com/rust-lang/rust/pull/45483
6384 [45524]: https://github.com/rust-lang/rust/pull/45524
6385 [45571]: https://github.com/rust-lang/rust/pull/45571
6386 [45580]: https://github.com/rust-lang/rust/pull/45580
6387 [45610]: https://github.com/rust-lang/rust/pull/45610
6388 [45660]: https://github.com/rust-lang/rust/pull/45660
6389 [45692]: https://github.com/rust-lang/rust/pull/45692
6390 [45711]: https://github.com/rust-lang/rust/pull/45711
6391 [45772]: https://github.com/rust-lang/rust/pull/45772
6392 [45852]: https://github.com/rust-lang/rust/issues/45852
6393 [45853]: https://github.com/rust-lang/rust/pull/45853
6394 [45887]: https://github.com/rust-lang/rust/pull/45887
6395 [45920]: https://github.com/rust-lang/rust/pull/45920
6396 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6397 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6398 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6401 Version 1.22.1 (2017-11-22)
6402 ==========================
6404 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6406 [46183]: https://github.com/rust-lang/rust/pull/46183
6408 Version 1.22.0 (2017-11-22)
6409 ==========================
6413 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6414 - [Now accepts underscores in unicode escapes][43716]
6415 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6416 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6420 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6421 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6422 This should decrease compile times for debug builds.
6423 - [strict memory alignment now enabled on ARMv6][45094]
6424 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6428 - [Allow atomic operations up to 32 bits
6429 on `armv5te_unknown_linux_gnueabi`][44978]
6430 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6431 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6432 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6433 - [Properly detect overflow in `Instant += Duration`.][44220]
6434 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6435 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6436 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6443 - [Cargo will now build multi file examples in subdirectories of the `examples`
6444 folder that have a `main.rs` file.][cargo/4496]
6445 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6446 the old format will continue to work and can be updated with `cargo update`.
6447 - [Now supports vendoring git repositories][cargo/3992]
6451 - [`libbacktrace` is now available on Apple platforms.][44251]
6452 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6453 This now lets you specify that a given code example will fail to compile.
6457 - [The minimum Android version that rustc can build for has been bumped
6458 to `4.0` from `2.3`][45656]
6459 - [Allowing `T op= &T` for numeric types has broken some type
6460 inference cases][45480]
6463 [42526]: https://github.com/rust-lang/rust/pull/42526
6464 [43716]: https://github.com/rust-lang/rust/pull/43716
6465 [43949]: https://github.com/rust-lang/rust/pull/43949
6466 [44015]: https://github.com/rust-lang/rust/pull/44015
6467 [44220]: https://github.com/rust-lang/rust/pull/44220
6468 [44251]: https://github.com/rust-lang/rust/pull/44251
6469 [44287]: https://github.com/rust-lang/rust/pull/44287
6470 [44303]: https://github.com/rust-lang/rust/pull/44303
6471 [44456]: https://github.com/rust-lang/rust/pull/44456
6472 [44466]: https://github.com/rust-lang/rust/pull/44466
6473 [44895]: https://github.com/rust-lang/rust/pull/44895
6474 [44966]: https://github.com/rust-lang/rust/pull/44966
6475 [44978]: https://github.com/rust-lang/rust/pull/44978
6476 [45041]: https://github.com/rust-lang/rust/pull/45041
6477 [45064]: https://github.com/rust-lang/rust/pull/45064
6478 [45075]: https://github.com/rust-lang/rust/pull/45075
6479 [45094]: https://github.com/rust-lang/rust/pull/45094
6480 [45095]: https://github.com/rust-lang/rust/pull/45095
6481 [45480]: https://github.com/rust-lang/rust/issues/45480
6482 [45656]: https://github.com/rust-lang/rust/pull/45656
6483 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6484 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6485 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6492 Version 1.21.0 (2017-10-12)
6493 ==========================
6497 - [You can now use static references for literals.][43838]
6501 let x: &'static u32 = &0;
6504 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6507 my_macro!(Vec<i32>::new); // Always worked
6508 my_macro!(Vec::<i32>::new); // Now works
6513 - [Upgraded jemalloc to 4.5.0][43911]
6514 - [Enabled unwinding panics on Redox][43917]
6515 - [Now runs LLVM in parallel during translation phase.][43506]
6516 This should reduce peak memory usage.
6520 - [Generate builtin impls for `Clone` for all arrays and tuples that
6521 are `T: Clone`][43690]
6522 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6523 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6524 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6529 [`std::mem::discriminant`]
6533 - [You can now call `cargo install` with multiple package names][cargo/4216]
6534 - [Cargo commands inside a virtual workspace will now implicitly
6535 pass `--all`][cargo/4335]
6536 - [Added a `[patch]` section to `Cargo.toml` to handle
6537 prepublication dependencies][cargo/4123] [RFC 1969]
6538 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6539 like patterns][cargo/4270]
6540 - [Added the `--all-targets` option][cargo/4400]
6541 - [Using required dependencies as a feature is now deprecated and emits
6542 a warning][cargo/4364]
6547 - [Cargo docs are moving][43916]
6548 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6549 - [The rustdoc book is now available][43863]
6550 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6551 - [Added a preview of RLS has been made available through rustup][44204]
6552 Install with `rustup component add rls-preview`
6553 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6554 Previously only showed `std::os::unix`.
6558 - [Changes in method matching against higher-ranked types][43880] This may cause
6559 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6560 - [rustc's JSON error output's byte position start at top of file.][42973]
6561 Was previously relative to the rustc's internal `CodeMap` struct which
6562 required the unstable library `libsyntax` to correctly use.
6563 - [`unused_results` lint no longer ignores booleans][43728]
6565 [42565]: https://github.com/rust-lang/rust/pull/42565
6566 [42973]: https://github.com/rust-lang/rust/pull/42973
6567 [43348]: https://github.com/rust-lang/rust/pull/43348
6568 [43459]: https://github.com/rust-lang/rust/pull/43459
6569 [43506]: https://github.com/rust-lang/rust/pull/43506
6570 [43540]: https://github.com/rust-lang/rust/pull/43540
6571 [43690]: https://github.com/rust-lang/rust/pull/43690
6572 [43728]: https://github.com/rust-lang/rust/pull/43728
6573 [43838]: https://github.com/rust-lang/rust/pull/43838
6574 [43863]: https://github.com/rust-lang/rust/pull/43863
6575 [43880]: https://github.com/rust-lang/rust/pull/43880
6576 [43911]: https://github.com/rust-lang/rust/pull/43911
6577 [43916]: https://github.com/rust-lang/rust/pull/43916
6578 [43917]: https://github.com/rust-lang/rust/pull/43917
6579 [44204]: https://github.com/rust-lang/rust/pull/44204
6580 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6581 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6582 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6583 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6584 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6585 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6586 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6587 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6588 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6590 Version 1.20.0 (2017-08-31)
6591 ===========================
6595 - [Associated constants are now stabilised.][42809]
6596 - [A lot of macro bugs are now fixed.][42913]
6601 - [Struct fields are now properly coerced to the expected field type.][42807]
6602 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6603 `wasm32-experimental-emscripten` target.
6604 - [Changed some of the error messages to be more helpful.][42033]
6605 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6607 - [rustc now reports the total number of errors on compilation failure][43015]
6608 previously this was only the number of errors in the pass that failed.
6609 - [Expansion in rustc has been sped up 29x.][42533]
6610 - [added `msp430-none-elf` target.][43099]
6611 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6613 - [Fixes backtraces on Redox][43228]
6614 - [rustc now identifies different versions of same crate when absolute paths of
6615 different types match in an error message.][42826]
6621 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6622 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6624 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6625 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6626 - [Impl `Clone` for `DefaultHasher`.][42799]
6627 - [Impl `Sync` for `SyncSender`.][42397]
6628 - [Impl `FromStr` for `char`][42271]
6629 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6631 - [allow messages in the `unimplemented!()` macro.][42155]
6632 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6633 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6634 - [Upgrade to Unicode 10.0.0][42999]
6635 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6636 - [Skip the main thread's manual stack guard on Linux][43072]
6637 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6638 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6640 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6645 - [`CStr::into_c_string`]
6646 - [`CString::as_c_str`]
6647 - [`CString::into_boxed_c_str`]
6648 - [`Chain::get_mut`]
6649 - [`Chain::get_ref`]
6650 - [`Chain::into_inner`]
6651 - [`Option::get_or_insert_with`]
6652 - [`Option::get_or_insert`]
6653 - [`OsStr::into_os_string`]
6654 - [`OsString::into_boxed_os_str`]
6657 - [`Utf8Error::error_len`]
6658 - [`char::EscapeDebug`]
6659 - [`char::escape_debug`]
6660 - [`compile_error!`]
6661 - [`f32::from_bits`]
6663 - [`f64::from_bits`]
6665 - [`mem::ManuallyDrop`]
6666 - [`slice::sort_unstable_by_key`]
6667 - [`slice::sort_unstable_by`]
6668 - [`slice::sort_unstable`]
6669 - [`str::from_boxed_utf8_unchecked`]
6670 - [`str::as_bytes_mut`]
6671 - [`str::as_bytes_mut`]
6672 - [`str::from_utf8_mut`]
6673 - [`str::from_utf8_unchecked_mut`]
6675 - [`str::get_unchecked_mut`]
6676 - [`str::get_unchecked`]
6678 - [`str::into_boxed_bytes`]
6683 - [Cargo API token location moved from `~/.cargo/config` to
6684 `~/.cargo/credentials`.][cargo/3978]
6685 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6686 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6687 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6688 - [You can now specify version of a binary when installed through
6689 `cargo install` using `--vers`.][cargo/4229]
6690 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6691 failure.][cargo/4248]
6692 - [Changed the convention around which file is the crate root.][cargo/4259]
6697 - [Functions with `'static` in their return types will now not be as usable as
6698 if they were using lifetime parameters instead.][42417]
6699 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6700 takes the sign of NaN into account where previously didn't.][42430]
6702 [42033]: https://github.com/rust-lang/rust/pull/42033
6703 [42155]: https://github.com/rust-lang/rust/pull/42155
6704 [42271]: https://github.com/rust-lang/rust/pull/42271
6705 [42397]: https://github.com/rust-lang/rust/pull/42397
6706 [42417]: https://github.com/rust-lang/rust/pull/42417
6707 [42430]: https://github.com/rust-lang/rust/pull/42430
6708 [42431]: https://github.com/rust-lang/rust/pull/42431
6709 [42533]: https://github.com/rust-lang/rust/pull/42533
6710 [42571]: https://github.com/rust-lang/rust/pull/42571
6711 [42613]: https://github.com/rust-lang/rust/pull/42613
6712 [42799]: https://github.com/rust-lang/rust/pull/42799
6713 [42807]: https://github.com/rust-lang/rust/pull/42807
6714 [42809]: https://github.com/rust-lang/rust/pull/42809
6715 [42822]: https://github.com/rust-lang/rust/pull/42822
6716 [42826]: https://github.com/rust-lang/rust/pull/42826
6717 [42854]: https://github.com/rust-lang/rust/pull/42854
6718 [42913]: https://github.com/rust-lang/rust/pull/42913
6719 [42999]: https://github.com/rust-lang/rust/pull/42999
6720 [43011]: https://github.com/rust-lang/rust/pull/43011
6721 [43015]: https://github.com/rust-lang/rust/pull/43015
6722 [43072]: https://github.com/rust-lang/rust/pull/43072
6723 [43077]: https://github.com/rust-lang/rust/pull/43077
6724 [43097]: https://github.com/rust-lang/rust/pull/43097
6725 [43099]: https://github.com/rust-lang/rust/pull/43099
6726 [43170]: https://github.com/rust-lang/rust/pull/43170
6727 [43178]: https://github.com/rust-lang/rust/pull/43178
6728 [43185]: https://github.com/rust-lang/rust/pull/43185
6729 [43228]: https://github.com/rust-lang/rust/pull/43228
6730 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6731 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6732 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6733 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6734 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6735 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6736 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6737 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6738 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6739 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6740 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6741 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6742 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6743 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6744 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6745 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6746 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6747 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6748 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6749 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6750 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6751 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6752 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6753 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6754 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6755 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6756 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6757 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6758 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6759 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6760 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6761 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6762 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6763 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6764 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6765 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6766 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6767 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6770 Version 1.19.0 (2017-07-20)
6771 ===========================
6776 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6777 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6778 - [Macro recursion limit increased to 1024 from 64.][41676]
6779 - [Added lint for detecting unused macros.][41907]
6780 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6781 For example: `let x = loop { break 7; };`
6782 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6783 contain `Copy` types and cannot have a `Drop` implementation.
6784 Example: `union Foo { bar: u8, baz: usize }`
6785 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6786 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6791 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6792 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6793 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6794 you should use `--target armv7-linux-androideabi`.
6795 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6796 - [Minor optimisation of string operations.][42037]
6797 - [Compiler error message is now `aborting due to previous error(s)` instead of
6798 `aborting due to N previous errors`][42150] This was previously inaccurate and
6799 would only count certain kinds of errors.
6800 - [The compiler now supports Visual Studio 2017][42225]
6801 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6802 - [Added a lot][42264] of [new error codes][42302]
6803 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6804 libraries with C Run-time Libraries(CRT) to be statically linked.
6805 - [Fixed various ARM codegen bugs][42740]
6810 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6811 `Extend<Cow<'a, str>>`][41449]
6812 - [`Vec` now implements `From<&mut [T]>`][41530]
6813 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6814 - [`SplitWhitespace` now implements `Clone`][41659]
6815 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6817 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6818 macros, but for printing to stderr.
6823 - [`OsString::shrink_to_fit`]
6826 - [`thread::ThreadId`]
6831 - [Build scripts can now add environment variables to the environment
6832 the crate is being compiled in.
6833 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6834 - [Subcommands now replace the current process rather than spawning a new
6835 child process][cargo/3970]
6836 - [Workspace members can now accept glob file patterns][cargo/3979]
6837 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6838 the members in a given workspace.][cargo/3988]
6839 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6840 - [Target directory path is now in the cargo metadata][cargo/4022]
6841 - [Cargo no longer checks out a local working directory for the
6842 crates.io index][cargo/4026] This should provide smaller file size for the
6843 registry, and improve cloning times, especially on Windows machines.
6844 - [Added an `--exclude` option for excluding certain packages when using the
6845 `--all` option][cargo/4031]
6846 - [Cargo will now automatically retry when receiving a 5xx error
6847 from crates.io][cargo/4032]
6848 - [The `--features` option now accepts multiple comma or space
6849 delimited values.][cargo/4084]
6850 - [Added support for custom target specific runners][cargo/3954]
6855 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6857 - [Rust will now release XZ compressed packages][rust-installer/57]
6858 - [rustup will now prefer to download rust packages with
6859 XZ compression][rustup/1100] over GZip packages.
6860 - [Added the ability to escape `#` in rust documentation][41785] By adding
6861 additional `#`'s ie. `##` is now `#`
6866 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6867 - [`-Z` flags are now no longer allowed to be used on the stable
6868 compiler.][41751] This has been a warning for a year previous to this.
6869 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6870 longer works][42844]. Users should migrate to the built-in `check`
6871 command, which has been available since 1.16.
6872 - [Ending a float literal with `._` is now a hard error.
6873 Example: `42._` .][41946]
6874 - [Any use of a private `extern crate` outside of its module is now a
6875 hard error.][36886] This was previously a warning.
6876 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6877 relative while the `::` prefix makes a path absolute, but was ignored and the
6878 path was relative regardless.
6879 - [Floating point constants in match patterns is now a hard error][36890]
6880 This was previously a warning.
6881 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6882 match patterns is now a hard error][36891] This was previously a warning.
6883 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6885 - [From the pound escape, lines consisting of multiple `#`s are
6887 - [It is an error to re-export private enum variants][42460]. This is
6888 known to break a number of crates that depend on an older version of
6890 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6891 to use it to find the linker, and the build will fail where it did
6892 not previously][42607]
6894 [36886]: https://github.com/rust-lang/rust/issues/36886
6895 [36888]: https://github.com/rust-lang/rust/issues/36888
6896 [36890]: https://github.com/rust-lang/rust/issues/36890
6897 [36891]: https://github.com/rust-lang/rust/issues/36891
6898 [36892]: https://github.com/rust-lang/rust/issues/36892
6899 [37406]: https://github.com/rust-lang/rust/issues/37406
6900 [39983]: https://github.com/rust-lang/rust/pull/39983
6901 [41145]: https://github.com/rust-lang/rust/pull/41145
6902 [41192]: https://github.com/rust-lang/rust/pull/41192
6903 [41258]: https://github.com/rust-lang/rust/pull/41258
6904 [41370]: https://github.com/rust-lang/rust/pull/41370
6905 [41449]: https://github.com/rust-lang/rust/pull/41449
6906 [41530]: https://github.com/rust-lang/rust/pull/41530
6907 [41624]: https://github.com/rust-lang/rust/pull/41624
6908 [41656]: https://github.com/rust-lang/rust/pull/41656
6909 [41659]: https://github.com/rust-lang/rust/pull/41659
6910 [41676]: https://github.com/rust-lang/rust/pull/41676
6911 [41751]: https://github.com/rust-lang/rust/pull/41751
6912 [41764]: https://github.com/rust-lang/rust/pull/41764
6913 [41785]: https://github.com/rust-lang/rust/pull/41785
6914 [41873]: https://github.com/rust-lang/rust/pull/41873
6915 [41907]: https://github.com/rust-lang/rust/pull/41907
6916 [41946]: https://github.com/rust-lang/rust/pull/41946
6917 [42016]: https://github.com/rust-lang/rust/pull/42016
6918 [42037]: https://github.com/rust-lang/rust/pull/42037
6919 [42068]: https://github.com/rust-lang/rust/pull/42068
6920 [42150]: https://github.com/rust-lang/rust/pull/42150
6921 [42162]: https://github.com/rust-lang/rust/pull/42162
6922 [42225]: https://github.com/rust-lang/rust/pull/42225
6923 [42264]: https://github.com/rust-lang/rust/pull/42264
6924 [42302]: https://github.com/rust-lang/rust/pull/42302
6925 [42460]: https://github.com/rust-lang/rust/issues/42460
6926 [42607]: https://github.com/rust-lang/rust/issues/42607
6927 [42740]: https://github.com/rust-lang/rust/pull/42740
6928 [42844]: https://github.com/rust-lang/rust/issues/42844
6929 [42948]: https://github.com/rust-lang/rust/pull/42948
6930 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6931 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6932 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6933 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6934 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6935 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6936 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6937 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6938 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6939 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6940 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6941 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6942 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6943 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6944 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6945 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6946 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6947 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6948 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6949 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6950 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6951 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6954 Version 1.18.0 (2017-06-08)
6955 ===========================
6960 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6961 make the item visible to just that module tree. Also accepts the keyword
6962 `crate` to make something public to the whole crate but not users of the
6963 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6964 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6965 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6966 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6967 types like `Write + Send`, trailing `+` are now supported in trait objects,
6968 and better error reporting for trait objects starting with `?Sized`.
6969 - [0e+10 is now a valid floating point literal][40589]
6970 - [Now warns if you bind a lifetime parameter to 'static][40734]
6971 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6972 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6973 representation in some cases.][40377]
6978 - [rustc can now emit mir with `--emit mir`][39891]
6979 - [Improved LLVM IR for trivial functions][40367]
6980 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6981 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6982 opportunities found through profiling
6983 - [Improved backtrace formatting when panicking][38165]
6988 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6989 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6990 iteration or reallocation.
6991 - [Simplified HashMap Bucket interface][40561] provides performance
6992 improvements for iterating and cloning.
6993 - [Specialize Vec::from_elem to use calloc][40409]
6994 - [Fixed Race condition in fs::create_dir_all][39799]
6995 - [No longer caching stdio on Windows][40516]
6996 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6997 2.50%~ faster and in one case now 12.50% faster.
6998 - [Optimized `AtomicBool::fetch_nand`][41143]
7003 - [`Child::try_wait`]
7004 - [`HashMap::retain`]
7005 - [`HashSet::retain`]
7007 - [`TcpStream::peek`]
7008 - [`UdpSocket::peek`]
7009 - [`UdpSocket::peek_from`]
7014 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
7015 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
7016 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
7017 - [Added Android build support][cargo/3885]
7018 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
7019 of a certain type, for example `cargo build --bins` will build all
7021 - [Added support for haiku][cargo/3952]
7026 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
7027 - [Rust now uses the official cross compiler for NetBSD][40612]
7028 - [rustdoc now accepts `#` at the start of files][40828]
7029 - [Fixed jemalloc support for musl][41168]
7034 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
7035 always placed after the sign if it exists and before the digits. With the `#`
7036 flag the zeroes are placed after the prefix and before the digits.
7037 - [Due to the struct field optimisation][40377], using `transmute` on structs
7038 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
7039 always been undefined behavior, but is now more likely to break in practice.
7040 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
7041 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
7042 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
7043 - [Overlapping inherent `impl`s are now a hard error][40728]
7044 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
7045 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
7046 `out.asm` and `out.ll` instead of only one of the filetypes.
7047 - [ calling a function that returns `Self` will no longer work][41805] when
7048 the size of `Self` cannot be statically determined.
7049 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
7050 this has caused a few regressions namely:
7052 - Changed the link order of local static/dynamic libraries (respecting the
7053 order on given rather than having the compiler reorder).
7054 - Changed how MinGW is linked, native code linked to dynamic libraries
7055 may require manually linking to the gcc support library (for the native
7058 [38165]: https://github.com/rust-lang/rust/pull/38165
7059 [39799]: https://github.com/rust-lang/rust/pull/39799
7060 [39891]: https://github.com/rust-lang/rust/pull/39891
7061 [40043]: https://github.com/rust-lang/rust/pull/40043
7062 [40241]: https://github.com/rust-lang/rust/pull/40241
7063 [40338]: https://github.com/rust-lang/rust/pull/40338
7064 [40367]: https://github.com/rust-lang/rust/pull/40367
7065 [40377]: https://github.com/rust-lang/rust/pull/40377
7066 [40409]: https://github.com/rust-lang/rust/pull/40409
7067 [40516]: https://github.com/rust-lang/rust/pull/40516
7068 [40556]: https://github.com/rust-lang/rust/pull/40556
7069 [40561]: https://github.com/rust-lang/rust/pull/40561
7070 [40589]: https://github.com/rust-lang/rust/pull/40589
7071 [40612]: https://github.com/rust-lang/rust/pull/40612
7072 [40723]: https://github.com/rust-lang/rust/pull/40723
7073 [40728]: https://github.com/rust-lang/rust/pull/40728
7074 [40731]: https://github.com/rust-lang/rust/pull/40731
7075 [40734]: https://github.com/rust-lang/rust/pull/40734
7076 [40805]: https://github.com/rust-lang/rust/pull/40805
7077 [40807]: https://github.com/rust-lang/rust/pull/40807
7078 [40828]: https://github.com/rust-lang/rust/pull/40828
7079 [40870]: https://github.com/rust-lang/rust/pull/40870
7080 [41085]: https://github.com/rust-lang/rust/pull/41085
7081 [41143]: https://github.com/rust-lang/rust/pull/41143
7082 [41168]: https://github.com/rust-lang/rust/pull/41168
7083 [41270]: https://github.com/rust-lang/rust/issues/41270
7084 [41469]: https://github.com/rust-lang/rust/pull/41469
7085 [41805]: https://github.com/rust-lang/rust/issues/41805
7086 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
7087 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
7088 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
7089 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
7090 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
7091 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
7092 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
7093 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
7094 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
7095 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
7096 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
7097 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
7098 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
7099 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
7102 Version 1.17.0 (2017-04-27)
7103 ===========================
7108 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
7109 * [Fields of structs may be initialized without duplicating the field/variable
7110 names][39761]. [RFC 1682]
7111 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
7112 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7113 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
7114 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
7115 `'b`. Soundness fix.
7116 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
7117 * [Static variables may contain references to other statics][40027]
7122 * [Exit quickly on only `--emit dep-info`][40336]
7123 * [Make `-C relocation-model` more correctly determine whether the linker
7124 creates a position-independent executable][40245]
7125 * [Add `-C overflow-checks` to directly control whether integer overflow
7127 * [The rustc type checker now checks items on demand instead of in a single
7128 in-order pass][40008]. This is mostly an internal refactoring in support of
7129 future work, including incremental type checking, but also resolves [RFC
7130 1647], allowing `Self` to appear in `impl` `where` clauses.
7131 * [Optimize vtable loads][39995]
7132 * [Turn off vectorization for Emscripten targets][39990]
7133 * [Provide suggestions for unknown macros imported with `use`][39953]
7134 * [Fix ICEs in path resolution][39939]
7135 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
7136 * [Add clearer error message using `&str + &str`][39116]
7147 * [`Ordering::then`]
7148 * [`Ordering::then_with`]
7149 * [`BTreeMap::range`]
7150 * [`BTreeMap::range_mut`]
7151 * [`collections::Bound`]
7152 * [`process::abort`]
7153 * [`ptr::read_unaligned`]
7154 * [`ptr::write_unaligned`]
7155 * [`Result::expect_err`]
7158 * [`Cell::into_inner`]
7164 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
7165 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
7166 * [`String` implements `FromIterator<&char>`][40028]
7167 * `Box` [implements][40009] a number of new conversions:
7168 `From<Box<str>> for String`,
7169 `From<Box<[T]>> for Vec<T>`,
7170 `From<Box<CStr>> for CString`,
7171 `From<Box<OsStr>> for OsString`,
7172 `From<Box<Path>> for PathBuf`,
7173 `Into<Box<str>> for String`,
7174 `Into<Box<[T]>> for Vec<T>`,
7175 `Into<Box<CStr>> for CString`,
7176 `Into<Box<OsStr>> for OsString`,
7177 `Into<Box<Path>> for PathBuf`,
7178 `Default for Box<str>`,
7179 `Default for Box<CStr>`,
7180 `Default for Box<OsStr>`,
7181 `From<&CStr> for Box<CStr>`,
7182 `From<&OsStr> for Box<OsStr>`,
7183 `From<&Path> for Box<Path>`
7184 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
7185 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
7186 * [Slightly optimize `slice::sort`][39538]
7187 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
7188 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
7189 `Box<str>` implements `From<&str>`][39438]
7190 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
7191 `From<(I, u16)> where I: Into<IpAddr>`][39372]
7192 * [`format!` estimates the needed capacity before writing a string][39356]
7193 * [Support unprivileged symlink creation in Windows][38921]
7194 * [`PathBuf` implements `Default`][38764]
7195 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
7196 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
7197 and poor hash functions.
7202 * [Add `cargo check --all`][cargo/3731]
7203 * [Add an option to ignore SSL revocation checking][cargo/3699]
7204 * [Add `cargo run --package`][cargo/3691]
7205 * [Add `required_features`][cargo/3667]
7206 * [Assume `build.rs` is a build script][cargo/3664]
7207 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
7212 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
7214 * [The "Unstable Book" documents nightly-only features][ubook]
7215 * [Improve the style of the sidebar in rustdoc output][40265]
7216 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
7217 * [Fix MSP430 breakage due to `i128`][40257]
7218 * [Preliminary Solaris/SPARCv9 support][39903]
7219 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
7220 run without installing the MSVC runtime.
7221 * [`rustdoc --test` includes file names in test names][39788]
7222 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
7223 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
7224 * [Initial support for `aarch64-unknown-freebsd`][39491]
7225 * [Initial support for `i686-unknown-netbsd`][39426]
7226 * [This release no longer includes the old makefile build system][39431]. Rust
7227 is built with a custom build system, written in Rust, and with Cargo.
7228 * [Add Debug implementations for libcollection structs][39002]
7229 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
7230 * [`--test-threads=0` produces an error][38945]
7231 * [`rustup` installs documentation by default][40526]
7232 * [The Rust source includes NatVis visualizations][39843]. These can be used by
7233 WinDbg and Visual Studio to improve the debugging experience.
7238 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
7239 workaround, either use MSVC 2015 or run vcvars.bat.
7240 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7241 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
7242 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
7244 * [`format!` and `Display::to_string` panic if an underlying formatting
7245 implementation returns an error][40117]. Previously the error was silently
7246 ignored. It is incorrect for `write_fmt` to return an error when writing
7248 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
7249 crates were marked stable and could be accessed from the stable toolchain.
7250 * [Rust git source no longer includes vendored crates][39728]. Those that need
7251 to build with vendored crates should build from release tarballs.
7252 * [Fix inert attributes from `proc_macro_derives`][39572]
7253 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
7254 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
7256 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
7257 existing code generally ignores the type of dead-code unless a type-hint is
7258 provided; this can cause surprising inference interactions particularly around
7259 defaulting. The new code uniformly ignores the result type of dead-code.
7260 * [Tuple-struct constructors with private fields are no longer visible][38932]
7261 * [Lifetime parameters that do not appear in the arguments are now considered
7262 early-bound][38897], resolving a soundness bug (#[32330]). The
7263 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
7265 * [rustdoc: fix doctests with non-feature crate attributes][38161]
7266 * [Make transmuting from fn item types to pointer-sized types a hard
7269 [27787]: https://github.com/rust-lang/rust/issues/27787
7270 [32330]: https://github.com/rust-lang/rust/issues/32330
7271 [34198]: https://github.com/rust-lang/rust/pull/34198
7272 [38161]: https://github.com/rust-lang/rust/pull/38161
7273 [38368]: https://github.com/rust-lang/rust/pull/38368
7274 [38584]: https://github.com/rust-lang/rust/issues/38584
7275 [38661]: https://github.com/rust-lang/rust/pull/38661
7276 [38764]: https://github.com/rust-lang/rust/pull/38764
7277 [38864]: https://github.com/rust-lang/rust/issues/38864
7278 [38897]: https://github.com/rust-lang/rust/pull/38897
7279 [38921]: https://github.com/rust-lang/rust/pull/38921
7280 [38932]: https://github.com/rust-lang/rust/pull/38932
7281 [38945]: https://github.com/rust-lang/rust/pull/38945
7282 [38981]: https://github.com/rust-lang/rust/pull/38981
7283 [39002]: https://github.com/rust-lang/rust/pull/39002
7284 [39116]: https://github.com/rust-lang/rust/pull/39116
7285 [39193]: https://github.com/rust-lang/rust/pull/39193
7286 [39265]: https://github.com/rust-lang/rust/pull/39265
7287 [39356]: https://github.com/rust-lang/rust/pull/39356
7288 [39372]: https://github.com/rust-lang/rust/pull/39372
7289 [39426]: https://github.com/rust-lang/rust/pull/39426
7290 [39431]: https://github.com/rust-lang/rust/pull/39431
7291 [39438]: https://github.com/rust-lang/rust/pull/39438
7292 [39440]: https://github.com/rust-lang/rust/pull/39440
7293 [39485]: https://github.com/rust-lang/rust/pull/39485
7294 [39491]: https://github.com/rust-lang/rust/pull/39491
7295 [39518]: https://github.com/rust-lang/rust/pull/39518
7296 [39538]: https://github.com/rust-lang/rust/pull/39538
7297 [39572]: https://github.com/rust-lang/rust/pull/39572
7298 [39633]: https://github.com/rust-lang/rust/pull/39633
7299 [39642]: https://github.com/rust-lang/rust/pull/39642
7300 [39728]: https://github.com/rust-lang/rust/pull/39728
7301 [39761]: https://github.com/rust-lang/rust/pull/39761
7302 [39788]: https://github.com/rust-lang/rust/pull/39788
7303 [39793]: https://github.com/rust-lang/rust/pull/39793
7304 [39837]: https://github.com/rust-lang/rust/pull/39837
7305 [39843]: https://github.com/rust-lang/rust/pull/39843
7306 [39851]: https://github.com/rust-lang/rust/pull/39851
7307 [39903]: https://github.com/rust-lang/rust/pull/39903
7308 [39939]: https://github.com/rust-lang/rust/pull/39939
7309 [39953]: https://github.com/rust-lang/rust/pull/39953
7310 [39960]: https://github.com/rust-lang/rust/pull/39960
7311 [39990]: https://github.com/rust-lang/rust/pull/39990
7312 [39995]: https://github.com/rust-lang/rust/pull/39995
7313 [40008]: https://github.com/rust-lang/rust/pull/40008
7314 [40009]: https://github.com/rust-lang/rust/pull/40009
7315 [40027]: https://github.com/rust-lang/rust/pull/40027
7316 [40028]: https://github.com/rust-lang/rust/pull/40028
7317 [40037]: https://github.com/rust-lang/rust/pull/40037
7318 [40117]: https://github.com/rust-lang/rust/pull/40117
7319 [40166]: https://github.com/rust-lang/rust/pull/40166
7320 [40245]: https://github.com/rust-lang/rust/pull/40245
7321 [40257]: https://github.com/rust-lang/rust/pull/40257
7322 [40261]: https://github.com/rust-lang/rust/pull/40261
7323 [40265]: https://github.com/rust-lang/rust/pull/40265
7324 [40319]: https://github.com/rust-lang/rust/pull/40319
7325 [40336]: https://github.com/rust-lang/rust/pull/40336
7326 [40526]: https://github.com/rust-lang/rust/pull/40526
7327 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7328 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7329 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7330 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7331 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7332 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7333 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7334 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7335 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7336 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7337 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7338 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7339 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7340 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7341 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7342 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7343 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7344 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7345 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7346 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7347 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7348 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7349 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7350 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7351 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7352 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7353 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7354 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7355 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7356 [ubook]: https://doc.rust-lang.org/unstable-book/
7359 Version 1.16.0 (2017-03-16)
7360 ===========================
7365 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7366 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7367 match patterns][38069]
7368 * [Clean up semantics of `self` in an import list][38313]
7369 * [`Self` may appear in `impl` headers][38920]
7370 * [`Self` may appear in struct expressions][39282]
7375 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7376 a `.rmeta` file containing only crate metadata][38571]. This can be
7377 used by tools like the Rust Language Service to perform
7378 metadata-only builds.
7379 * [Levenshtein based typo suggestions now work in most places, while
7380 previously they worked only for fields and sometimes for local
7381 variables][38927]. Together with the overhaul of "no
7382 resolution"/"unexpected resolution" errors (#[38154]) they result in
7383 large and systematic improvement in resolution diagnostics.
7384 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7386 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7387 * [`rustc` no longer attempts to provide "consider using an explicit
7388 lifetime" suggestions][37057]. They were inaccurate.
7393 * [`VecDeque::truncate`]
7394 * [`VecDeque::resize`]
7395 * [`String::insert_str`]
7396 * [`Duration::checked_add`]
7397 * [`Duration::checked_sub`]
7398 * [`Duration::checked_div`]
7399 * [`Duration::checked_mul`]
7402 * [`SocketAddr::is_ipv4`]
7403 * [`SocketAddr::is_ipv6`]
7404 * [`IpAddr::is_ipv4`]
7405 * [`IpAddr::is_ipv6`]
7407 * [`Vec::dedup_by_key`]
7408 * [`Result::unwrap_or_default`]
7409 * [`<*const T>::wrapping_offset`]
7410 * [`<*mut T>::wrapping_offset`]
7411 * `CommandExt::creation_flags`
7412 * [`File::set_permissions`]
7413 * [`String::split_off`]
7418 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7419 their argument by `Borrow` parameter][37761]
7420 * [All public types in std implement `Debug`][38006]
7421 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7422 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7423 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7425 * [std: Fix partial writes in `LineWriter`][38062]
7426 * [std: Clamp max read/write sizes on Unix][38622]
7427 * [Use more specific panic message for `&str` slicing errors][38066]
7428 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7429 functionality cannot be achieved in std currently.
7430 * [`writeln!`, like `println!`, now accepts a form with no string
7431 or formatting arguments, to just print a newline][38469]
7432 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7433 * [Reduce the size of static data in `std_unicode::tables`][38781]
7434 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7435 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7437 * [`Duration` implements `Sum`][38712]
7438 * [`String` implements `ToSocketAddrs`][39048]
7443 * [The `cargo check` command does a type check of a project without
7444 building it][cargo/3296]
7445 * [crates.io will display CI badges from Travis and AppVeyor, if
7446 specified in Cargo.toml][cargo/3546]
7447 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7448 * [Compilation profiles accept integer values for `debug`, in addition
7449 to `true` and `false`. These are passed to `rustc` as the value to
7450 `-C debuginfo`][cargo/3534]
7451 * [Implement `cargo --version --verbose`][cargo/3604]
7452 * [All builds now output 'dep-info' build dependencies compatible with
7453 make and ninja][cargo/3557]
7454 * [Build all workspace members with `build --all`][cargo/3511]
7455 * [Document all workspace members with `doc --all`][cargo/3515]
7456 * [Path deps outside workspace are not members][cargo/3443]
7461 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7462 the path to the Rust implementation][38589]
7463 * [The `armv7-linux-androideabi` target no longer enables NEON
7464 extensions, per Google's ABI guide][38413]
7465 * [The stock standard library can be compiled for Redox OS][38401]
7466 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7468 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7470 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7475 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7476 match patterns][38069]
7477 * In this release, references to uninhabited types can not be
7478 pattern-matched. This was accidentally allowed in 1.15.
7479 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7480 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7482 * [Clean up semantics of `self` in an import list][38313]
7483 * Reimplemented lifetime elision. This change was almost entirely compatible
7484 with existing code, but it did close a number of small bugs and loopholes,
7485 as well as being more accepting in some other [cases][41105].
7487 [37057]: https://github.com/rust-lang/rust/pull/37057
7488 [37761]: https://github.com/rust-lang/rust/pull/37761
7489 [38006]: https://github.com/rust-lang/rust/pull/38006
7490 [38051]: https://github.com/rust-lang/rust/pull/38051
7491 [38062]: https://github.com/rust-lang/rust/pull/38062
7492 [38622]: https://github.com/rust-lang/rust/pull/38622
7493 [38066]: https://github.com/rust-lang/rust/pull/38066
7494 [38069]: https://github.com/rust-lang/rust/pull/38069
7495 [38131]: https://github.com/rust-lang/rust/pull/38131
7496 [38154]: https://github.com/rust-lang/rust/pull/38154
7497 [38274]: https://github.com/rust-lang/rust/pull/38274
7498 [38304]: https://github.com/rust-lang/rust/pull/38304
7499 [38313]: https://github.com/rust-lang/rust/pull/38313
7500 [38327]: https://github.com/rust-lang/rust/pull/38327
7501 [38401]: https://github.com/rust-lang/rust/pull/38401
7502 [38413]: https://github.com/rust-lang/rust/pull/38413
7503 [38469]: https://github.com/rust-lang/rust/pull/38469
7504 [38559]: https://github.com/rust-lang/rust/pull/38559
7505 [38571]: https://github.com/rust-lang/rust/pull/38571
7506 [38580]: https://github.com/rust-lang/rust/pull/38580
7507 [38589]: https://github.com/rust-lang/rust/pull/38589
7508 [38670]: https://github.com/rust-lang/rust/pull/38670
7509 [38712]: https://github.com/rust-lang/rust/pull/38712
7510 [38726]: https://github.com/rust-lang/rust/pull/38726
7511 [38781]: https://github.com/rust-lang/rust/pull/38781
7512 [38798]: https://github.com/rust-lang/rust/pull/38798
7513 [38909]: https://github.com/rust-lang/rust/pull/38909
7514 [38920]: https://github.com/rust-lang/rust/pull/38920
7515 [38927]: https://github.com/rust-lang/rust/pull/38927
7516 [39048]: https://github.com/rust-lang/rust/pull/39048
7517 [39282]: https://github.com/rust-lang/rust/pull/39282
7518 [39379]: https://github.com/rust-lang/rust/pull/39379
7519 [41105]: https://github.com/rust-lang/rust/issues/41105
7520 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7521 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7522 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7523 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7524 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7525 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7526 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7527 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7528 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7529 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7530 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7531 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7532 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7533 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7534 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7535 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7536 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7537 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7538 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7539 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7540 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7541 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7542 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7543 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7544 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7545 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7546 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7547 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7548 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7551 Version 1.15.1 (2017-02-09)
7552 ===========================
7554 * [Fix IntoIter::as_mut_slice's signature][39466]
7555 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7557 [39466]: https://github.com/rust-lang/rust/pull/39466
7558 [39523]: https://github.com/rust-lang/rust/pull/39523
7561 Version 1.15.0 (2017-02-02)
7562 ===========================
7567 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7568 stable. This allows popular code-generating crates like Serde and Diesel to
7569 work ergonomically. [RFC 1681].
7570 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7571 with curly braces][36868]. Part of [RFC 1506].
7572 * [A number of minor changes to name resolution have been activated][37127].
7573 They add up to more consistent semantics, allowing for future evolution of
7574 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7575 details of what is different. The breaking changes here have been transitioned
7576 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7577 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7579 * [`?Sized` can be used in `where` clauses][37791]
7580 * [There is now a limit on the size of monomorphized types and it can be
7581 modified with the `#![type_size_limit]` crate attribute, similarly to
7582 the `#![recursion_limit]` attribute][37789]
7587 * [On Windows, the compiler will apply dllimport attributes when linking to
7588 extern functions][37973]. Additional attributes and flags can control which
7589 library kind is linked and its name. [RFC 1717].
7590 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7591 * [The `--test` flag works with procedural macro crates][38107]
7592 * [Fix `extern "aapcs" fn` ABI][37814]
7593 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7594 * [The `format!` expander recognizes incorrect `printf` and shell-style
7595 formatting directives and suggests the correct format][37613].
7596 * [Only report one error for all unused imports in an import list][37456]
7598 Compiler Performance
7599 --------------------
7601 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7602 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7603 * [Don't clone in `UnificationTable::probe`][37848]
7604 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7605 * [Use small vectors in type walker][37760]
7606 * [Macro expansion performance was improved][37701]
7607 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7608 * [Replace FNV with a faster hash function][37229]
7613 * [`std::iter::Iterator::min_by`]
7614 * [`std::iter::Iterator::max_by`]
7615 * [`std::os::*::fs::FileExt`]
7616 * [`std::sync::atomic::Atomic*::get_mut`]
7617 * [`std::sync::atomic::Atomic*::into_inner`]
7618 * [`std::vec::IntoIter::as_slice`]
7619 * [`std::vec::IntoIter::as_mut_slice`]
7620 * [`std::sync::mpsc::Receiver::try_iter`]
7621 * [`std::os::unix::process::CommandExt::before_exec`]
7622 * [`std::rc::Rc::strong_count`]
7623 * [`std::rc::Rc::weak_count`]
7624 * [`std::sync::Arc::strong_count`]
7625 * [`std::sync::Arc::weak_count`]
7626 * [`std::char::encode_utf8`]
7627 * [`std::char::encode_utf16`]
7628 * [`std::cell::Ref::clone`]
7629 * [`std::io::Take::into_inner`]
7634 * [The standard sorting algorithm has been rewritten for dramatic performance
7635 improvements][38192]. It is a hybrid merge sort, drawing influences from
7636 Timsort. Previously it was a naive merge sort.
7637 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7638 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7640 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7641 and `char_indices().last()`][37882]
7642 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7643 * [Chinese characters display correctly in `fmt::Debug`][37855]
7644 * [Derive `Default` for `Duration`][37699]
7645 * [Support creation of anonymous pipes on WinXP/2k][37677]
7646 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7647 * [Don't pass overlapped handles to processes][38835]
7652 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7653 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7654 should instead check the variable at runtime with `std::env`. That the value
7655 was set at build time was a bug, and incorrect when cross-compiling. This
7656 change is known to cause breakage.
7657 * [Add `--all` flag to `cargo test`][cargo/3221]
7658 * [Compile statically against the MSVC CRT][cargo/3363]
7659 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7660 * [Link OpenSSL statically on OSX][cargo/3311]
7661 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7662 * [Test for bad path overrides with summaries][cargo/3336]
7663 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7664 * [Fix retrying crate downloads for network errors][cargo/3348]
7665 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7666 * [Emit more info on --message-format=json][cargo/3319]
7667 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7668 * [Don't ignore errors in workspace manifest][cargo/3409]
7669 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7674 * [Test runners (binaries built with `--test`) now support a `--list` argument
7675 that lists the tests it contains][38185]
7676 * [Test runners now support a `--exact` argument that makes the test filter
7677 match exactly, instead of matching only a substring of the test name][38181]
7678 * [rustdoc supports a `--playground-url` flag][37763]
7679 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7684 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7685 continue to be used in this release by passing `--disable-rustbuild` to the
7686 configure script, but they will be deleted soon. Note that the new build
7687 system uses a different on-disk layout that will likely affect any scripts
7689 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7691 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7692 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7698 * [A number of minor changes to name resolution have been activated][37127].
7699 They add up to more consistent semantics, allowing for future evolution of
7700 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7701 details of what is different. The breaking changes here have been transitioned
7702 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7703 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7704 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7705 should instead check the variable at runtime with `std::env`. That the value
7706 was set at build time was a bug, and incorrect when cross-compiling. This
7707 change is known to cause breakage.
7708 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7709 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7710 1.10 and is now an error by default. It will become a hard error in the near
7712 * [The semantics relating modules to file system directories are changing in
7713 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7714 lint, which is a warning in this release, and will become a hard error in the
7716 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7717 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7718 the underlying iterator][37834]
7720 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7721 [33685]: https://github.com/rust-lang/rust/issues/33685
7722 [36868]: https://github.com/rust-lang/rust/pull/36868
7723 [37127]: https://github.com/rust-lang/rust/pull/37127
7724 [37229]: https://github.com/rust-lang/rust/pull/37229
7725 [37456]: https://github.com/rust-lang/rust/pull/37456
7726 [37527]: https://github.com/rust-lang/rust/pull/37527
7727 [37602]: https://github.com/rust-lang/rust/pull/37602
7728 [37613]: https://github.com/rust-lang/rust/pull/37613
7729 [37615]: https://github.com/rust-lang/rust/pull/37615
7730 [37636]: https://github.com/rust-lang/rust/pull/37636
7731 [37627]: https://github.com/rust-lang/rust/pull/37627
7732 [37642]: https://github.com/rust-lang/rust/pull/37642
7733 [37677]: https://github.com/rust-lang/rust/pull/37677
7734 [37699]: https://github.com/rust-lang/rust/pull/37699
7735 [37701]: https://github.com/rust-lang/rust/pull/37701
7736 [37705]: https://github.com/rust-lang/rust/pull/37705
7737 [37749]: https://github.com/rust-lang/rust/pull/37749
7738 [37760]: https://github.com/rust-lang/rust/pull/37760
7739 [37763]: https://github.com/rust-lang/rust/pull/37763
7740 [37764]: https://github.com/rust-lang/rust/pull/37764
7741 [37789]: https://github.com/rust-lang/rust/pull/37789
7742 [37791]: https://github.com/rust-lang/rust/pull/37791
7743 [37814]: https://github.com/rust-lang/rust/pull/37814
7744 [37817]: https://github.com/rust-lang/rust/pull/37817
7745 [37834]: https://github.com/rust-lang/rust/pull/37834
7746 [37848]: https://github.com/rust-lang/rust/pull/37848
7747 [37855]: https://github.com/rust-lang/rust/pull/37855
7748 [37882]: https://github.com/rust-lang/rust/pull/37882
7749 [37888]: https://github.com/rust-lang/rust/pull/37888
7750 [37973]: https://github.com/rust-lang/rust/pull/37973
7751 [37979]: https://github.com/rust-lang/rust/pull/37979
7752 [38086]: https://github.com/rust-lang/rust/pull/38086
7753 [38107]: https://github.com/rust-lang/rust/pull/38107
7754 [38117]: https://github.com/rust-lang/rust/pull/38117
7755 [38134]: https://github.com/rust-lang/rust/pull/38134
7756 [38146]: https://github.com/rust-lang/rust/pull/38146
7757 [38181]: https://github.com/rust-lang/rust/pull/38181
7758 [38182]: https://github.com/rust-lang/rust/pull/38182
7759 [38185]: https://github.com/rust-lang/rust/pull/38185
7760 [38192]: https://github.com/rust-lang/rust/pull/38192
7761 [38279]: https://github.com/rust-lang/rust/pull/38279
7762 [38835]: https://github.com/rust-lang/rust/pull/38835
7763 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7764 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7765 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7766 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7767 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7768 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7769 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7770 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7771 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7772 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7773 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7774 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7775 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7776 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7777 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7778 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7779 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7780 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7781 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7782 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7783 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7784 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7785 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7786 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7787 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7788 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7789 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7790 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7791 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7792 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7793 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7794 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7795 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7796 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7797 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7798 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7799 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7802 Version 1.14.0 (2016-12-22)
7803 ===========================
7808 * [`..` matches multiple tuple fields in enum variants, structs
7809 and tuples][36843]. [RFC 1492].
7810 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7811 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7812 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7813 dereferencing][36822]
7818 * [Mark enums with non-zero discriminant as non-zero][37224]
7819 * [Lower-case `static mut` names are linted like other
7820 statics and consts][37162]
7821 * [Fix ICE on some macros in const integer positions
7822 (e.g. `[u8; m!()]`)][36819]
7823 * [Improve error message and snippet for "did you mean `x`"][36798]
7824 * [Add a panic-strategy field to the target specification][36794]
7825 * [Include LLVM version in `--version --verbose`][37200]
7827 Compile-time Optimizations
7828 --------------------------
7830 * [Improve macro expansion performance][37569]
7831 * [Shrink `Expr_::ExprInlineAsm`][37445]
7832 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7833 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7834 * [Avoid more allocations when compiling html5ever][37373]
7835 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7836 * [Avoid some allocations in the macro parser][37318]
7837 * [Use a faster deflate setting][37298]
7838 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7839 during interning of slices][37270]
7840 * [Optimize `write_metadata`][37267]
7841 * [Don't process obligation forest cycles when stalled][37231]
7842 * [Avoid many `CrateConfig` clones][37161]
7843 * [Optimize `Substs::super_fold_with`][37108]
7844 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7845 * [Speed up `plug_leaks`][36917]
7850 * [`println!()`, with no arguments, prints newline][36825].
7851 Previously, an empty string was required to achieve the same.
7852 * [`Wrapping` impls standard binary and unary operators, as well as
7853 the `Sum` and `Product` iterators][37356]
7854 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7856 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7857 `VecDeque` iterators][37315]
7858 * [Improve `SipHasher` performance on small values][37312]
7859 * [Add Iterator trait TrustedLen to enable better FromIterator /
7861 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7862 * [`ReadDir` implements `Debug`][37221]
7863 * [Implement `RefUnwindSafe` for atomic types][37178]
7864 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7865 * [Avoid allocations in `Decoder::read_str`][37064]
7866 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7867 * [Impl `Debug` for raw pointers to unsized data][36880]
7868 * [Don't reuse `HashMap` random seeds][37470]
7869 * [The internal memory layout of `HashMap` is more cache-friendly, for
7870 significant improvements in some operations][36692]
7871 * [`HashMap` uses less memory on 32-bit architectures][36595]
7872 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7877 * [Expose rustc cfg values to build scripts][cargo/3243]
7878 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7879 * [Fix passing --features when testing multiple packages][cargo/3280]
7880 * [Use a single profile set per workspace][cargo/3249]
7881 * [Load `replace` sections from lock files][cargo/3220]
7882 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7887 * [rustup is the recommended Rust installation method][1.14rustup]
7888 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7889 S390x. These are [tier 2] platforms and may have major defects. Follow the
7890 instructions on the website to install, or add the targets to an existing
7891 installation with `rustup target add`. The new target triples are:
7892 - `mips-unknown-linux-gnu`
7893 - `mipsel-unknown-linux-gnu`
7894 - `mips64-unknown-linux-gnuabi64`
7895 - `mips64el-unknown-linux-gnuabi64 `
7896 - `powerpc-unknown-linux-gnu`
7897 - `powerpc64-unknown-linux-gnu`
7898 - `powerpc64le-unknown-linux-gnu`
7899 - `s390x-unknown-linux-gnu `
7900 * This release includes target (std) builds for ARM Linux running MUSL
7901 libc. These are [tier 2] platforms and may have major defects. Add the
7902 following triples to an existing rustup installation with `rustup target add`:
7903 - `arm-unknown-linux-musleabi`
7904 - `arm-unknown-linux-musleabihf`
7905 - `armv7-unknown-linux-musleabihf`
7906 * This release includes [experimental support for WebAssembly][1.14wasm], via
7907 the `wasm32-unknown-emscripten` target. This target is known to have major
7908 defects. Please test, report, and fix.
7909 * rustup no longer installs documentation by default. Run `rustup
7910 component add rust-docs` to install.
7911 * [Fix line stepping in debugger][37310]
7912 * [Enable line number debuginfo in releases][37280]
7917 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7918 * [Add support for Fuchsia OS][37313]
7919 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7924 * [A number of forward-compatibility lints used by the compiler
7925 to gradually introduce language changes have been converted
7926 to deny by default][36894]:
7927 - ["use of inaccessible extern crate erroneously allowed"][36886]
7928 - ["type parameter default erroneously allowed in invalid location"][36887]
7929 - ["detects super or self keywords at the beginning of global path"][36888]
7930 - ["two overlapping inherent impls define an item with the same name
7931 were erroneously allowed"][36889]
7932 - ["floating-point constants cannot be used in patterns"][36890]
7933 - ["constants of struct or enum type can only be used in a pattern if
7934 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7935 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7936 * [Prohibit patterns in trait methods without bodies][37378]
7937 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7938 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7939 * [The `$crate` macro variable is accepted in fewer locations][37213]
7940 * [Impls specifying extra region requirements beyond the trait
7941 they implement are rejected][37167]
7942 * [Enums may not be unsized][37111]. Unsized enums are intended to
7943 work but never have. For now they are forbidden.
7944 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7946 [tier 2]: https://forge.rust-lang.org/platform-support.html
7947 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7948 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7949 [36430]: https://github.com/rust-lang/rust/pull/36430
7950 [36595]: https://github.com/rust-lang/rust/pull/36595
7951 [36692]: https://github.com/rust-lang/rust/pull/36692
7952 [36767]: https://github.com/rust-lang/rust/pull/36767
7953 [36794]: https://github.com/rust-lang/rust/pull/36794
7954 [36798]: https://github.com/rust-lang/rust/pull/36798
7955 [36819]: https://github.com/rust-lang/rust/pull/36819
7956 [36822]: https://github.com/rust-lang/rust/pull/36822
7957 [36825]: https://github.com/rust-lang/rust/pull/36825
7958 [36843]: https://github.com/rust-lang/rust/pull/36843
7959 [36880]: https://github.com/rust-lang/rust/pull/36880
7960 [36886]: https://github.com/rust-lang/rust/issues/36886
7961 [36887]: https://github.com/rust-lang/rust/issues/36887
7962 [36888]: https://github.com/rust-lang/rust/issues/36888
7963 [36889]: https://github.com/rust-lang/rust/issues/36889
7964 [36890]: https://github.com/rust-lang/rust/issues/36890
7965 [36891]: https://github.com/rust-lang/rust/issues/36891
7966 [36892]: https://github.com/rust-lang/rust/issues/36892
7967 [36894]: https://github.com/rust-lang/rust/pull/36894
7968 [36917]: https://github.com/rust-lang/rust/pull/36917
7969 [36993]: https://github.com/rust-lang/rust/pull/36993
7970 [37037]: https://github.com/rust-lang/rust/pull/37037
7971 [37064]: https://github.com/rust-lang/rust/pull/37064
7972 [37094]: https://github.com/rust-lang/rust/pull/37094
7973 [37108]: https://github.com/rust-lang/rust/pull/37108
7974 [37111]: https://github.com/rust-lang/rust/pull/37111
7975 [37161]: https://github.com/rust-lang/rust/pull/37161
7976 [37162]: https://github.com/rust-lang/rust/pull/37162
7977 [37167]: https://github.com/rust-lang/rust/pull/37167
7978 [37178]: https://github.com/rust-lang/rust/pull/37178
7979 [37200]: https://github.com/rust-lang/rust/pull/37200
7980 [37213]: https://github.com/rust-lang/rust/pull/37213
7981 [37221]: https://github.com/rust-lang/rust/pull/37221
7982 [37224]: https://github.com/rust-lang/rust/pull/37224
7983 [37230]: https://github.com/rust-lang/rust/pull/37230
7984 [37231]: https://github.com/rust-lang/rust/pull/37231
7985 [37247]: https://github.com/rust-lang/rust/pull/37247
7986 [37267]: https://github.com/rust-lang/rust/pull/37267
7987 [37270]: https://github.com/rust-lang/rust/pull/37270
7988 [37273]: https://github.com/rust-lang/rust/pull/37273
7989 [37280]: https://github.com/rust-lang/rust/pull/37280
7990 [37298]: https://github.com/rust-lang/rust/pull/37298
7991 [37306]: https://github.com/rust-lang/rust/pull/37306
7992 [37310]: https://github.com/rust-lang/rust/pull/37310
7993 [37312]: https://github.com/rust-lang/rust/pull/37312
7994 [37313]: https://github.com/rust-lang/rust/pull/37313
7995 [37315]: https://github.com/rust-lang/rust/pull/37315
7996 [37318]: https://github.com/rust-lang/rust/pull/37318
7997 [37322]: https://github.com/rust-lang/rust/pull/37322
7998 [37326]: https://github.com/rust-lang/rust/pull/37326
7999 [37351]: https://github.com/rust-lang/rust/pull/37351
8000 [37356]: https://github.com/rust-lang/rust/pull/37356
8001 [37367]: https://github.com/rust-lang/rust/pull/37367
8002 [37373]: https://github.com/rust-lang/rust/pull/37373
8003 [37378]: https://github.com/rust-lang/rust/pull/37378
8004 [37389]: https://github.com/rust-lang/rust/pull/37389
8005 [37392]: https://github.com/rust-lang/rust/pull/37392
8006 [37427]: https://github.com/rust-lang/rust/pull/37427
8007 [37439]: https://github.com/rust-lang/rust/pull/37439
8008 [37445]: https://github.com/rust-lang/rust/pull/37445
8009 [37470]: https://github.com/rust-lang/rust/pull/37470
8010 [37569]: https://github.com/rust-lang/rust/pull/37569
8011 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
8012 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
8013 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
8014 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
8015 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
8016 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
8017 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
8020 Version 1.13.0 (2016-11-10)
8021 ===========================
8026 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
8027 errors, like the `try!` macro, described in [RFC 0243].
8028 * [Stabilize macros in type position][36014]. Described in [RFC 873].
8029 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
8030 * [Fix `#[derive]` for empty tuple structs/variants][35728]
8031 * [Fix lifetime rules for 'if' conditions][36029]
8032 * [Avoid loading and parsing unconfigured non-inline modules][36482]
8037 * [Add the `-C link-arg` argument][36574]
8038 * [Remove the old AST-based backend from rustc_trans][35764]
8039 * [Don't enable NEON by default on armv7 Linux][35814]
8040 * [Fix debug line number info for macro expansions][35238]
8041 * [Do not emit "class method" debuginfo for types that are not
8042 DICompositeType][36008]
8043 * [Warn about multiple conflicting #[repr] hints][34623]
8044 * [When sizing DST, don't double-count nested struct prefixes][36351]
8045 * [Default RUST_MIN_STACK to 16MiB for now][36505]
8046 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
8047 * [Reject macros with empty repetitions to avoid infinite loop][36721]
8048 * [Expand macros without recursing to avoid stack overflows][36214]
8053 * [Replace macro backtraces with labeled local uses][35702]
8054 * [Improve error message for misplaced doc comments][33922]
8055 * [Buffer unix and lock windows to prevent message interleaving][35975]
8056 * [Update lifetime errors to specifically note temporaries][36171]
8057 * [Special case a few colors for Windows][36178]
8058 * [Suggest `use self` when such an import resolves][36289]
8059 * [Be more specific when type parameter shadows primitive type][36338]
8060 * Many minor improvements
8062 Compile-time Optimizations
8063 --------------------------
8065 * [Compute and cache HIR hashes at beginning][35854]
8066 * [Don't hash types in loan paths][36004]
8067 * [Cache projections in trans][35761]
8068 * [Optimize the parser's last token handling][36527]
8069 * [Only instantiate #[inline] functions in codegen units referencing
8070 them][36524]. This leads to big improvements in cases where crates export
8071 define many inline functions without using them directly.
8072 * [Lazily allocate TypedArena's first chunk][36592]
8073 * [Don't allocate during default HashSet creation][36734]
8080 * [`overflowing_abs`]
8081 * [`RefCell::try_borrow`]
8082 * [`RefCell::try_borrow_mut`]
8087 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
8088 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
8090 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
8091 * [Implement `Debug` for `std::vec::IntoIter`][35707]
8092 * [`CString`: avoid excessive growth just to 0-terminate][35871]
8093 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
8094 * [Use arc4rand on FreeBSD][35884]
8095 * [memrchr: Correct aligned offset computation][35969]
8096 * [Improve Demangling of Rust Symbols][36059]
8097 * [Use monotonic time in condition variables][35048]
8098 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
8099 * [Implement conversion traits for `char`][35755]
8100 * [Fix illegal instruction caused by overflow in channel cloning][36104]
8101 * [Zero first byte of CString on drop][36264]
8102 * [Inherit overflow checks for sum and product][36372]
8103 * [Add missing Eq implementations][36423]
8104 * [Implement `Debug` for `DirEntry`][36631]
8105 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
8107 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
8108 * [Implement more traits for `std::io::ErrorKind`][35911]
8109 * [Optimize BinaryHeap bounds checking][36072]
8110 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
8111 `extend_with_element`][36355]
8112 * [Fix overflow checking in unsigned pow()][34942]
8117 * This release includes security fixes to both curl and OpenSSL.
8118 * [Fix transitive doctests when panic=abort][cargo/3021]
8119 * [Add --all-features flag to cargo][cargo/3038]
8120 * [Reject path-based dependencies in `cargo package`][cargo/3060]
8121 * [Don't parse the home directory more than once][cargo/3078]
8122 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
8123 * [Update OpenSSL to 1.0.2j][cargo/3121]
8124 * [Add license and license_file to cargo metadata output][cargo/3110]
8125 * [Make crates-io registry URL optional in config; ignore all changes to
8126 source.crates-io][cargo/3089]
8127 * [Don't download dependencies from other platforms][cargo/3123]
8128 * [Build transitive dev-dependencies when needed][cargo/3125]
8129 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
8130 * [Avoid updating registry when adding existing deps][cargo/3144]
8131 * [Warn about path overrides that won't work][cargo/3136]
8132 * [Use workspaces during `cargo install`][cargo/3146]
8133 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
8134 * [Add --message-format flag][cargo/3000]
8135 * [Pass target environment for rustdoc][cargo/3205]
8136 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
8137 * [Update curl and curl-sys][cargo/3241]
8138 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
8143 * [rustdoc: Add the `--sysroot` argument][36586]
8144 * [rustdoc: Fix a couple of issues with the search results][35655]
8145 * [rustdoc: remove the `!` from macro URLs and titles][35234]
8146 * [gdb: Fix pretty-printing special-cased Rust types][35585]
8147 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
8152 * [Remove unmaintained style guide][35124]
8153 * [Add s390x support][36369]
8154 * [Initial work at Haiku OS support][36727]
8155 * [Add mips-uclibc targets][35734]
8156 * [Crate-ify compiler-rt into compiler-builtins][35021]
8157 * [Add rustc version info (git hash + date) to dist tarball][36213]
8158 * Many documentation improvements
8163 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
8164 * [Deny (by default) transmuting from fn item types to pointer-sized
8165 types][34923]. Continuing the long transition to zero-sized fn items,
8167 * [Fix `#[derive]` for empty tuple structs/variants][35728].
8169 * [Issue deprecation warnings for safe accesses to extern statics][36173]
8170 * [Fix lifetime rules for 'if' conditions][36029].
8171 * [Inherit overflow checks for sum and product][36372].
8172 * [Forbid user-defined macros named "macro_rules"][36730].
8174 [33922]: https://github.com/rust-lang/rust/pull/33922
8175 [34623]: https://github.com/rust-lang/rust/pull/34623
8176 [34923]: https://github.com/rust-lang/rust/pull/34923
8177 [34942]: https://github.com/rust-lang/rust/pull/34942
8178 [35021]: https://github.com/rust-lang/rust/pull/35021
8179 [35048]: https://github.com/rust-lang/rust/pull/35048
8180 [35074]: https://github.com/rust-lang/rust/pull/35074
8181 [35124]: https://github.com/rust-lang/rust/pull/35124
8182 [35234]: https://github.com/rust-lang/rust/pull/35234
8183 [35238]: https://github.com/rust-lang/rust/pull/35238
8184 [35354]: https://github.com/rust-lang/rust/pull/35354
8185 [35559]: https://github.com/rust-lang/rust/pull/35559
8186 [35585]: https://github.com/rust-lang/rust/pull/35585
8187 [35627]: https://github.com/rust-lang/rust/pull/35627
8188 [35655]: https://github.com/rust-lang/rust/pull/35655
8189 [35702]: https://github.com/rust-lang/rust/pull/35702
8190 [35707]: https://github.com/rust-lang/rust/pull/35707
8191 [35728]: https://github.com/rust-lang/rust/pull/35728
8192 [35734]: https://github.com/rust-lang/rust/pull/35734
8193 [35755]: https://github.com/rust-lang/rust/pull/35755
8194 [35761]: https://github.com/rust-lang/rust/pull/35761
8195 [35764]: https://github.com/rust-lang/rust/pull/35764
8196 [35814]: https://github.com/rust-lang/rust/pull/35814
8197 [35854]: https://github.com/rust-lang/rust/pull/35854
8198 [35871]: https://github.com/rust-lang/rust/pull/35871
8199 [35884]: https://github.com/rust-lang/rust/pull/35884
8200 [35911]: https://github.com/rust-lang/rust/pull/35911
8201 [35969]: https://github.com/rust-lang/rust/pull/35969
8202 [35975]: https://github.com/rust-lang/rust/pull/35975
8203 [36004]: https://github.com/rust-lang/rust/pull/36004
8204 [36008]: https://github.com/rust-lang/rust/pull/36008
8205 [36014]: https://github.com/rust-lang/rust/pull/36014
8206 [36029]: https://github.com/rust-lang/rust/pull/36029
8207 [36059]: https://github.com/rust-lang/rust/pull/36059
8208 [36072]: https://github.com/rust-lang/rust/pull/36072
8209 [36101]: https://github.com/rust-lang/rust/pull/36101
8210 [36104]: https://github.com/rust-lang/rust/pull/36104
8211 [36171]: https://github.com/rust-lang/rust/pull/36171
8212 [36173]: https://github.com/rust-lang/rust/pull/36173
8213 [36178]: https://github.com/rust-lang/rust/pull/36178
8214 [36213]: https://github.com/rust-lang/rust/pull/36213
8215 [36214]: https://github.com/rust-lang/rust/pull/36214
8216 [36264]: https://github.com/rust-lang/rust/pull/36264
8217 [36266]: https://github.com/rust-lang/rust/pull/36266
8218 [36289]: https://github.com/rust-lang/rust/pull/36289
8219 [36338]: https://github.com/rust-lang/rust/pull/36338
8220 [36351]: https://github.com/rust-lang/rust/pull/36351
8221 [36355]: https://github.com/rust-lang/rust/pull/36355
8222 [36369]: https://github.com/rust-lang/rust/pull/36369
8223 [36372]: https://github.com/rust-lang/rust/pull/36372
8224 [36423]: https://github.com/rust-lang/rust/pull/36423
8225 [36482]: https://github.com/rust-lang/rust/pull/36482
8226 [36505]: https://github.com/rust-lang/rust/pull/36505
8227 [36524]: https://github.com/rust-lang/rust/pull/36524
8228 [36527]: https://github.com/rust-lang/rust/pull/36527
8229 [36551]: https://github.com/rust-lang/rust/pull/36551
8230 [36574]: https://github.com/rust-lang/rust/pull/36574
8231 [36586]: https://github.com/rust-lang/rust/pull/36586
8232 [36592]: https://github.com/rust-lang/rust/pull/36592
8233 [36631]: https://github.com/rust-lang/rust/pull/36631
8234 [36721]: https://github.com/rust-lang/rust/pull/36721
8235 [36727]: https://github.com/rust-lang/rust/pull/36727
8236 [36730]: https://github.com/rust-lang/rust/pull/36730
8237 [36734]: https://github.com/rust-lang/rust/pull/36734
8238 [36754]: https://github.com/rust-lang/rust/pull/36754
8239 [36995]: https://github.com/rust-lang/rust/pull/36995
8240 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
8241 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
8242 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
8243 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
8244 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
8245 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
8246 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
8247 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
8248 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
8249 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
8250 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
8251 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
8252 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
8253 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
8254 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
8255 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
8256 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
8257 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
8258 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
8259 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
8260 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
8261 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
8262 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
8263 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
8264 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
8265 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
8266 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
8267 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
8268 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
8269 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
8270 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
8271 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
8274 Version 1.12.1 (2016-10-20)
8275 ===========================
8280 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
8281 * [Confusion with double negation and booleans][36856]
8282 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
8283 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
8284 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
8285 * [Corrupted memory after updated to 1.12][36936]
8286 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
8287 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
8288 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
8290 [36381]: https://github.com/rust-lang/rust/issues/36381
8291 [36856]: https://github.com/rust-lang/rust/issues/36856
8292 [36875]: https://github.com/rust-lang/rust/issues/36875
8293 [36924]: https://github.com/rust-lang/rust/issues/36924
8294 [36926]: https://github.com/rust-lang/rust/issues/36926
8295 [36936]: https://github.com/rust-lang/rust/issues/36936
8296 [37026]: https://github.com/rust-lang/rust/issues/37026
8297 [37112]: https://github.com/rust-lang/rust/issues/37112
8298 [37153]: https://github.com/rust-lang/rust/issues/37153
8301 Version 1.12.0 (2016-09-29)
8302 ===========================
8307 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8308 This translation pass is far simpler than the previous AST->LLVM pass, and
8309 creates opportunities to perform new optimizations directly on the MIR. It
8310 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8311 * [`rustc` presents a new, more readable error format, along with
8312 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8313 Most common editors supporting Rust have been updated to work with it. It was
8314 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8319 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8320 This translation pass is far simpler than the previous AST->LLVM pass, and
8321 creates opportunities to perform new optimizations directly on the MIR. It
8322 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8323 * [Print the Rust target name, not the LLVM target name, with
8324 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8325 * [The computation of `TypeId` is correct in some cases where it was previously
8326 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8327 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8328 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8329 `--print relocation-models`, and `--print code-models` print the available
8330 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8331 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8332 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8333 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8334 These targets produce statically-linked binaries. There are no binary release
8340 * [`rustc` presents a new, more readable error format, along with
8341 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8342 Most common editors supporting Rust have been updated to work with it. It was
8343 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8344 * [In error descriptions, references are now described in plain English,
8345 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8346 * [In error type descriptions, unknown numeric types are named `{integer}` or
8347 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8348 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8353 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8354 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8355 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8356 useful](https://github.com/rust-lang/rust/pull/34908)
8357 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8358 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8359 * [Semicolons are properly required as statement delimiters inside
8360 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8361 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8366 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8367 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8368 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8369 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8370 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8371 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8372 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8373 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8374 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8375 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8376 Both on Unix and Windows.
8377 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8378 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8379 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8380 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8381 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8382 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8383 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8384 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8389 * [The `format!` macro and friends now allow a single argument to be formatted
8390 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8391 * [The lifetime bounds on `[T]::binary_search_by` and
8392 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8393 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8394 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8395 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8396 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8397 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8398 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8399 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8400 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8401 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8402 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8403 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8404 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8405 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8406 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8407 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8408 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8409 * [`mpsc::sync_channel` `Receiver`s return any available message before
8410 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8411 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8412 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8417 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8418 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8419 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8420 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8421 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8422 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8423 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8424 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8425 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8426 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8427 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8428 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8429 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8430 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8431 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8432 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8437 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8438 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8443 * [Test binaries now support a `--test-threads` argument to specify the number
8444 of threads used to run tests, and which acts the same as the
8445 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8446 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8447 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8448 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8449 * [Rust releases now come with source packages that can be installed by rustup
8450 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8451 The resulting source code can be used by tools and IDES, located in the
8452 sysroot under `lib/rustlib/src`.
8457 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8458 * Many minor improvements to the documentation.
8459 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8464 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8465 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8466 * [When formatting strings, if "precision" is specified, the "fill",
8467 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8468 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8471 Version 1.11.0 (2016-08-18)
8472 ===========================
8477 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8478 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8479 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8480 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8485 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8486 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8487 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8488 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8489 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8490 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8491 (in libcore - previously stabilized in libstd)
8492 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8493 (in libcore - previously stabilized in libstd)
8494 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8495 (in libcore - previously stabilized in libstd)
8496 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8497 (in libcore - previously stabilized in libstd)
8498 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8499 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8500 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8501 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8506 * [The `thread_local!` macro supports multiple definitions in a single
8507 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8508 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8509 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8510 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8511 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8512 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8513 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8514 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8519 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8520 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8521 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8522 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8523 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8524 and `-vv` prints warnings for all crates.
8525 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8526 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8527 This provides room for expansion by arbitrary tools.
8528 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8529 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8530 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8531 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8532 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8533 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8534 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8539 * [Caching projections speeds up type check dramatically for some
8540 workloads](https://github.com/rust-lang/rust/pull/33816)
8541 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8542 This hasher is faster, but is believed to provide sufficient
8543 protection from collision attacks.
8544 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8549 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8550 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8551 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8552 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8553 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8558 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8559 * [When emitting debug info, rustc emits frame pointers for closures,
8560 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8561 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8562 * Many more errors have been given error codes and extended
8564 * API documentation continues to be improved, with many new examples
8569 * [rustc no longer hangs when dependencies recursively re-export
8570 submodules](https://github.com/rust-lang/rust/pull/34542)
8571 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8572 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8573 rewritten](https://github.com/rust-lang/rust/pull/33895)
8574 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8575 No targets use this yet, but it works toward AVR support.
8580 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8581 * [The new follow-set rules that place restrictions on `macro_rules!`
8582 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8583 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8584 and has been a warning since 1.10.
8585 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8586 This causes breakage in some corner cases.
8589 Version 1.10.0 (2016-07-07)
8590 ===========================
8595 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8596 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8597 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8598 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8599 * [`panic!` can be converted to a runtime abort with the
8600 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8601 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8602 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8603 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8604 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8605 Note that Cargo does not yet directly support cdylibs.
8610 * `os::windows::fs::OpenOptionsExt::access_mode`
8611 * `os::windows::fs::OpenOptionsExt::share_mode`
8612 * `os::windows::fs::OpenOptionsExt::custom_flags`
8613 * `os::windows::fs::OpenOptionsExt::attributes`
8614 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8615 * `os::unix::fs::OpenOptionsExt::custom_flags`
8616 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8617 * `Default for sync::Weak`
8618 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8619 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8620 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8621 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8622 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8623 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8624 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8625 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8626 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8627 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8628 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8629 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8630 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8631 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8632 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8633 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8634 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8635 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8636 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8637 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8638 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8639 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8640 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8641 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8642 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8643 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8644 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8645 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8646 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8647 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8648 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8649 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8650 * Read/Write/RawFd impls for `UnixStream`
8651 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8652 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8653 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8654 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8655 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8656 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8657 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8658 * RawFd impls for `UnixListener`
8659 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8660 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8661 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8662 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8663 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8664 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8665 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8666 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8667 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8668 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8669 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8670 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8671 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8672 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8673 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8674 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8675 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8676 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8677 * RawFd impls for `UnixDatagram`
8678 * `{BTree,Hash}Map::values_mut`
8679 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8684 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8685 The semantics of this minor method are subtle and probably not what
8687 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8688 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8689 will fall back to `/dev/urandom` temporarily to avoid blocking
8690 during early boot](https://github.com/rust-lang/rust/pull/33086).
8691 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8692 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8693 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8694 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8695 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8696 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8697 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8701 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8702 This controls the runtime behavior of the `panic!` macro
8703 and can be either "unwind" (the default), or "abort".
8704 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8705 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8706 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8707 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8708 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8709 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8710 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8711 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8712 By default they are retried twice, which can be customized with the
8713 `net.retry` value in `.cargo/config`.
8714 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8715 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8716 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8717 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8718 Makes it possible to install multiple crates in parallel.
8719 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8720 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8721 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8722 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8723 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8724 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8729 * [rustc memory usage was reduced by refactoring the context used for
8730 type checking](https://github.com/rust-lang/rust/pull/33425).
8731 * [Speed up creation of `HashMap`s by caching the random keys used
8732 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8733 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8734 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8735 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8736 10x faster than the previous lookup tables.
8737 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8742 * Many incremental improvements to documentation and rustdoc.
8743 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8744 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8745 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8746 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8747 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8748 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8749 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8754 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8755 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8756 * [`std` no longer prints backtraces on platforms where the running
8757 module must be loaded with `env::current_exe`, which can't be relied
8758 on](https://github.com/rust-lang/rust/pull/33554).
8759 * This release includes std binaries for the i586-unknown-linux-gnu,
8760 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8761 i586 target is for old x86 hardware without SSE2, and the armv7
8762 target is for Android running on modern ARM architectures.
8763 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8764 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8765 * [On Unix the runtime aborts by calling `libc::abort` instead of
8766 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8767 * [Rust is now bootstrapped from the previous release of Rust,
8768 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8773 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8774 * [`target_env` for Linux ARM targets is just `gnu`, not
8775 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8776 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8777 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8778 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8779 Affects how macros are parsed.
8780 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8781 * [Feature-gated attributes on macro-generated macro invocations are
8782 now rejected](https://github.com/rust-lang/rust/pull/32791).
8783 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8784 This caused some minor changes to type inference.
8787 Version 1.9.0 (2016-05-26)
8788 ==========================
8793 * The `#[deprecated]` attribute when applied to an API will generate
8794 warnings when used. The warnings may be suppressed with
8795 `#[allow(deprecated)]`. [RFC 1270].
8796 * [`fn` item types are zero sized, and each `fn` names a unique
8797 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8798 `transmute` on a `fn` type will generate a warning for a few cycles,
8799 then will be converted to an error.
8800 * [Field and method resolution understand visibility, so private
8801 fields and methods cannot prevent the proper use of public fields
8802 and methods][1.9fv].
8803 * [The parser considers unicode codepoints in the
8804 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8810 * [`std::panic::catch_unwind`] (renamed from `recover`)
8811 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8812 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8813 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8814 * [`str::is_char_boundary`]
8815 * [`<*const T>::as_ref`]
8816 * [`<*mut T>::as_ref`]
8817 * [`<*mut T>::as_mut`]
8818 * [`AsciiExt::make_ascii_uppercase`]
8819 * [`AsciiExt::make_ascii_lowercase`]
8820 * [`char::decode_utf16`]
8821 * [`char::DecodeUtf16`]
8822 * [`char::DecodeUtf16Error`]
8823 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8824 * [`BTreeSet::take`]
8825 * [`BTreeSet::replace`]
8828 * [`HashSet::replace`]
8830 * [`OsString::with_capacity`]
8831 * [`OsString::clear`]
8832 * [`OsString::capacity`]
8833 * [`OsString::reserve`]
8834 * [`OsString::reserve_exact`]
8835 * [`OsStr::is_empty`]
8837 * [`std::os::unix::thread`]
8840 * [`JoinHandleExt::as_pthread_t`]
8841 * [`JoinHandleExt::into_pthread_t`]
8842 * [`HashSet::hasher`]
8843 * [`HashMap::hasher`]
8844 * [`CommandExt::exec`]
8845 * [`File::try_clone`]
8846 * [`SocketAddr::set_ip`]
8847 * [`SocketAddr::set_port`]
8848 * [`SocketAddrV4::set_ip`]
8849 * [`SocketAddrV4::set_port`]
8850 * [`SocketAddrV6::set_ip`]
8851 * [`SocketAddrV6::set_port`]
8852 * [`SocketAddrV6::set_flowinfo`]
8853 * [`SocketAddrV6::set_scope_id`]
8854 * [`slice::copy_from_slice`]
8855 * [`ptr::read_volatile`]
8856 * [`ptr::write_volatile`]
8857 * [`OpenOptions::create_new`]
8858 * [`TcpStream::set_nodelay`]
8859 * [`TcpStream::nodelay`]
8860 * [`TcpStream::set_ttl`]
8861 * [`TcpStream::ttl`]
8862 * [`TcpStream::set_only_v6`]
8863 * [`TcpStream::only_v6`]
8864 * [`TcpStream::take_error`]
8865 * [`TcpStream::set_nonblocking`]
8866 * [`TcpListener::set_ttl`]
8867 * [`TcpListener::ttl`]
8868 * [`TcpListener::set_only_v6`]
8869 * [`TcpListener::only_v6`]
8870 * [`TcpListener::take_error`]
8871 * [`TcpListener::set_nonblocking`]
8872 * [`UdpSocket::set_broadcast`]
8873 * [`UdpSocket::broadcast`]
8874 * [`UdpSocket::set_multicast_loop_v4`]
8875 * [`UdpSocket::multicast_loop_v4`]
8876 * [`UdpSocket::set_multicast_ttl_v4`]
8877 * [`UdpSocket::multicast_ttl_v4`]
8878 * [`UdpSocket::set_multicast_loop_v6`]
8879 * [`UdpSocket::multicast_loop_v6`]
8880 * [`UdpSocket::set_multicast_ttl_v6`]
8881 * [`UdpSocket::multicast_ttl_v6`]
8882 * [`UdpSocket::set_ttl`]
8883 * [`UdpSocket::ttl`]
8884 * [`UdpSocket::set_only_v6`]
8885 * [`UdpSocket::only_v6`]
8886 * [`UdpSocket::join_multicast_v4`]
8887 * [`UdpSocket::join_multicast_v6`]
8888 * [`UdpSocket::leave_multicast_v4`]
8889 * [`UdpSocket::leave_multicast_v6`]
8890 * [`UdpSocket::take_error`]
8891 * [`UdpSocket::connect`]
8892 * [`UdpSocket::send`]
8893 * [`UdpSocket::recv`]
8894 * [`UdpSocket::set_nonblocking`]
8899 * [`std::sync::Once` is poisoned if its initialization function
8901 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8902 * [Most types implement `fmt::Debug`][1.9db].
8903 * [The default buffer size used by `BufReader` and `BufWriter` was
8904 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8905 used by other languages.
8906 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8907 `Duration` additionally implements `*=` and `/=`][1.9ta].
8908 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8909 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8910 * [`Chain` implements `BufRead`][1.9ch].
8911 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8916 * [Cargo can now run concurrently][1.9cc].
8917 * [Top-level overrides allow specific revisions of crates to be
8918 overridden through the entire crate graph][1.9ct]. This is intended
8919 to make upgrades easier for large projects, by allowing crates to be
8920 forked temporarily until they've been upgraded and republished.
8921 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8922 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8923 on the commandline][1.9cf]. `rustc` arguments can also be specified
8924 in the `build.rustflags` configuration key.
8929 * [The time complexity of comparing variables for equivalence during type
8930 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8931 to major compilation time improvement in some scenarios.
8932 * [`ToString` is specialized for `str`, giving it the same performance
8933 as `to_owned`][1.9ts].
8934 * [Spawning processes with `Command::output` no longer creates extra
8936 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8937 for C-like enums][1.9cl].
8942 * [Passing the `--quiet` flag to a test runner will produce
8943 much-abbreviated output][1.9q].
8944 * The Rust Project now publishes std binaries for the
8945 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8946 `i586-pc-windows-msvc` targets.
8951 * [`std::sync::Once` is poisoned if its initialization function
8953 * [It is illegal to define methods with the same name in overlapping
8954 inherent `impl` blocks][1.9sn].
8955 * [`fn` item types are zero sized, and each `fn` names a unique
8956 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8957 `transmute` on a `fn` type will generate a warning for a few cycles,
8958 then will be converted to an error.
8959 * [Improvements to const evaluation may trigger new errors when integer
8960 literals are out of range][1.9ce].
8963 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8964 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8965 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8966 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8967 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8968 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8969 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8970 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8971 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8972 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8973 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8974 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8975 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8976 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8977 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8978 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8979 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8980 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8981 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8982 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8983 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8984 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8985 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8986 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8987 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8988 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8989 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8990 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8991 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8992 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8993 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8994 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8995 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8996 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8997 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8998 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8999 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
9000 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
9001 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
9002 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
9003 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
9004 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
9005 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
9006 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
9007 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
9008 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
9009 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
9010 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
9011 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
9012 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
9013 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
9014 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
9015 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
9016 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
9017 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
9018 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
9019 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
9020 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
9021 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
9022 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
9023 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
9024 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
9025 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
9026 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
9027 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
9028 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
9029 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
9030 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
9031 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
9032 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
9033 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
9034 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
9035 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
9036 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
9037 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
9038 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
9039 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
9040 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
9041 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
9042 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
9043 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
9044 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
9045 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
9046 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
9047 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
9048 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
9049 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
9050 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
9051 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
9052 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
9053 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
9054 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
9055 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
9056 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
9057 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
9058 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
9059 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
9060 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
9061 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
9062 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
9063 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
9064 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
9065 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
9066 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
9067 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
9068 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
9069 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
9070 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
9071 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
9072 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
9075 Version 1.8.0 (2016-04-14)
9076 ==========================
9081 * Rust supports overloading of compound assignment statements like
9082 `+=` by implementing the [`AddAssign`], [`SubAssign`],
9083 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
9084 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
9086 * Empty structs can be defined with braces, as in `struct Foo { }`, in
9087 addition to the non-braced form, `struct Foo;`. [RFC 218].
9093 * [`str::encode_utf16`] (renamed from `utf16_units`)
9094 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
9097 * [`ptr::drop_in_place`]
9099 * [`time::SystemTime`]
9101 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
9102 * [`Instant::elapsed`]
9103 * [`SystemTime::now`]
9104 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
9105 * [`SystemTime::elapsed`]
9106 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
9107 * [`SystemTimeError`]
9108 * [`SystemTimeError::duration`]
9109 * Various impls for `SystemTimeError`
9111 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
9112 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
9113 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
9114 * [The `write!` and `writeln!` macros correctly emit errors if any of
9115 their arguments can't be formatted][1.8w].
9116 * [Various I/O functions support large files on 32-bit Linux][1.8l].
9117 * [The Unix-specific `raw` modules, which contain a number of
9118 redefined C types are deprecated][1.8r], including `os::raw::unix`,
9119 `os::raw::macos`, and `os::raw::linux`. These modules defined types
9120 such as `ino_t` and `dev_t`. The inconsistency of these definitions
9121 across platforms was making it difficult to implement `std`
9122 correctly. Those that need these definitions should use the `libc`
9124 * The Unix-specific `MetadataExt` traits, including
9125 `os::unix::fs::MetadataExt`, which expose values such as inode
9126 numbers [no longer return platform-specific types][1.8r], but
9127 instead return widened integers. [RFC 1415].
9128 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
9129 * [Atomic loads and stores are not volatile][1.8a].
9130 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
9135 * [Inlining hash functions lead to a 3% compile-time improvement in
9136 some workloads][1.8h].
9137 * When using jemalloc, its symbols are [unprefixed so that it
9138 overrides the libc malloc implementation][1.8h]. This means that for
9139 rustc, LLVM is now using jemalloc, which results in a 6%
9140 compile-time improvement on a specific workload.
9141 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
9146 * [32-bit MSVC builds finally implement unwinding][1.8ms].
9147 i686-pc-windows-msvc is now considered a tier-1 platform.
9148 * [The `--print targets` flag prints a list of supported targets][1.8t].
9149 * [The `--print cfg` flag prints the `cfg`s defined for the current
9151 * [`rustc` can be built with an new Cargo-based build system, written
9152 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
9153 build system. To enable it configure with `configure --rustbuild`.
9154 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
9155 variants while also indicating the total number of missing variants
9156 if more than 3][1.8m].
9157 * [Executable stacks are disabled on Linux and BSD][1.8nx].
9158 * The Rust Project now publishes binary releases of the standard
9159 library for a number of tier-2 targets:
9160 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
9161 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
9162 `x86_64-rumprun-netbsd`. These can be installed with
9163 tools such as [multirust][1.8mr].
9168 * [`cargo init` creates a new Cargo project in the current
9169 directory][1.8ci]. It is otherwise like `cargo new`.
9170 * [Cargo has configuration keys for `-v` and
9171 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
9172 `[term]` section of `.cargo/config`.
9173 * [Configuration keys that evaluate to strings or integers can be set
9174 via environment variables][1.8ce]. For example the `build.jobs` key
9175 can be set via `CARGO_BUILD_JOBS`. Environment variables take
9176 precedence over config files.
9177 * [Target-specific dependencies support Rust `cfg` syntax for
9178 describing targets][1.8cfg] so that dependencies for multiple
9179 targets can be specified together. [RFC 1361].
9180 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
9181 `RUSTDOC` take precedence over the `build.target-dir`,
9182 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
9183 * [The child process tree is killed on Windows when Cargo is
9185 * [The `build.target` configuration value sets the target platform,
9186 like `--target`][1.8ct].
9191 * [Unstable compiler flags have been further restricted][1.8u]. Since
9192 1.0 `-Z` flags have been considered unstable, and other flags that
9193 were considered unstable additionally required passing `-Z
9194 unstable-options` to access. Unlike unstable language and library
9195 features though, these options have been accessible on the stable
9196 release channel. Going forward, *new unstable flags will not be
9197 available on the stable release channel*, and old unstable flags
9198 will warn about their usage. In the future, all unstable flags will
9199 be unavailable on the stable release channel.
9200 * [It is no longer possible to `match` on empty enum variants using
9201 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
9202 * The Unix-specific `MetadataExt` traits, including
9203 `os::unix::fs::MetadataExt`, which expose values such as inode
9204 numbers [no longer return platform-specific types][1.8r], but
9205 instead return widened integers. [RFC 1415].
9206 * [Modules sourced from the filesystem cannot appear within arbitrary
9207 blocks, but only within other modules][1.8mf].
9208 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
9209 * On Unix, [stack overflow triggers a runtime abort instead of a
9211 * [`Command::spawn` and its equivalents return an error if any of
9212 its command-line arguments contain interior `NUL`s][1.8n].
9213 * [Tuple and unit enum variants from other crates are in the type
9215 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
9216 type instead of `.a` files][1.8st]. Additionally, for the MSVC
9217 toolchain, `rustc` emits import libraries named `foo.dll.lib`
9218 instead of `foo.lib`.
9221 [1.8a]: https://github.com/rust-lang/rust/pull/30962
9222 [1.8b]: https://github.com/rust-lang/rust/pull/31123
9223 [1.8c]: https://github.com/rust-lang/rust/pull/31530
9224 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
9225 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
9226 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
9227 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
9228 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
9229 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
9230 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
9231 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
9232 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
9233 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
9234 [1.8h]: https://github.com/rust-lang/rust/pull/31460
9235 [1.8l]: https://github.com/rust-lang/rust/pull/31668
9236 [1.8m]: https://github.com/rust-lang/rust/pull/31020
9237 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
9238 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
9239 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
9240 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
9241 [1.8n]: https://github.com/rust-lang/rust/pull/31056
9242 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
9243 [1.8r]: https://github.com/rust-lang/rust/pull/31551
9244 [1.8so]: https://github.com/rust-lang/rust/pull/31333
9245 [1.8st]: https://github.com/rust-lang/rust/pull/29520
9246 [1.8t]: https://github.com/rust-lang/rust/pull/31358
9247 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
9248 [1.8u]: https://github.com/rust-lang/rust/pull/31793
9249 [1.8v]: https://github.com/rust-lang/rust/pull/31757
9250 [1.8w]: https://github.com/rust-lang/rust/pull/31904
9251 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
9252 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
9253 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
9254 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
9255 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
9256 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
9257 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
9258 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
9259 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
9260 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
9261 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
9262 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
9263 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
9264 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
9265 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
9266 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
9267 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
9268 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
9269 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
9270 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
9271 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
9272 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
9273 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
9274 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
9275 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
9276 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
9277 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
9278 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
9279 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
9280 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
9283 Version 1.7.0 (2016-03-03)
9284 ==========================
9291 * [`Path::strip_prefix`] (renamed from relative_from)
9292 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
9294 * [`Ipv4Addr::is_loopback`]
9295 * [`Ipv4Addr::is_private`]
9296 * [`Ipv4Addr::is_link_local`]
9297 * [`Ipv4Addr::is_multicast`]
9298 * [`Ipv4Addr::is_broadcast`]
9299 * [`Ipv4Addr::is_documentation`]
9301 * [`Ipv6Addr::is_unspecified`]
9302 * [`Ipv6Addr::is_loopback`]
9303 * [`Ipv6Addr::is_multicast`]
9306 * [`Vec::as_mut_slice`]
9308 * [`String::as_str`]
9309 * [`String::as_mut_str`]
9311 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9313 * `<[T]>::`[`sort_by_key`]
9314 * checked, saturated, and overflowing operations
9315 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9316 * [`i32::saturating_mul`]
9317 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9318 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9319 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9320 * [`u32::saturating_mul`]
9321 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9322 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9323 * and checked, saturated, and overflowing operations for other primitive types
9325 * [`ffi::IntoStringError`]
9326 * [`CString::into_string`]
9327 * [`CString::into_bytes`]
9328 * [`CString::into_bytes_with_nul`]
9329 * `From<CString> for Vec<u8>`
9331 * [`IntoStringError::into_cstring`]
9332 * [`IntoStringError::utf8_error`]
9333 * `Error for IntoStringError`
9335 * [`std::hash::BuildHasher`]
9336 * [`BuildHasher::Hasher`]
9337 * [`BuildHasher::build_hasher`]
9338 * [`std::hash::BuildHasherDefault`]
9339 * [`HashMap::with_hasher`]
9340 * [`HashMap::with_capacity_and_hasher`]
9341 * [`HashSet::with_hasher`]
9342 * [`HashSet::with_capacity_and_hasher`]
9343 * [`std::collections::hash_map::RandomState`]
9344 * [`RandomState::new`]
9345 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9346 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9347 from bytes is faster.
9348 * [The performance of `LineWriter` (and thus `io::stdout`) was
9349 improved by using `memchr` to search for newlines][1.7m].
9350 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9351 `f64` variants were stabilized previously.
9352 * [`BTreeMap` was rewritten to use less memory and improve the performance
9353 of insertion and iteration, the latter by as much as 5x][1.7bm].
9354 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9355 covariant over their contained type][1.7bt].
9356 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9357 over their contained type][1.7ll].
9358 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9360 * [`Any` is implemented for unsized types][1.7a].
9361 * [`Hash` is implemented for `Duration`][1.7h].
9366 * [When running tests with `--test`, rustdoc will pass `--cfg`
9367 arguments to the compiler][1.7dt].
9368 * [The compiler is built with RPATH information by default][1.7rpa].
9369 This means that it will be possible to run `rustc` when installed in
9370 unusual configurations without configuring the dynamic linker search
9372 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9373 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9374 over `LD_LIBRARY_PATH`.
9379 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9380 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9381 * [The `rerun-if-changed` build script directive no longer causes the
9382 build script to incorrectly run twice in certain scenarios][1.7rr].
9387 * Soundness fixes to the interactions between associated types and
9388 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9389 code that violates the new rules. This is a significant change that
9390 is known to break existing code, so it has emitted warnings for the
9391 new error cases since 1.4 to give crate authors time to adapt. The
9392 details of what is changing are subtle; read the RFC for more.
9393 * [Several bugs in the compiler's visibility calculations were
9394 fixed][1.7v]. Since this was found to break significant amounts of
9395 code, the new errors will be emitted as warnings for several release
9396 cycles, under the `private_in_public` lint.
9397 * Defaulted type parameters were accidentally accepted in positions
9398 that were not intended. In this release, [defaulted type parameters
9399 appearing outside of type definitions will generate a
9400 warning][1.7d], which will become an error in future releases.
9401 * [Parsing "." as a float results in an error instead of 0][1.7p].
9402 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9403 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9405 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9406 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9407 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9408 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9409 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9410 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9411 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9412 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9413 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9414 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9415 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9416 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9417 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9418 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9419 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9420 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9421 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9422 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9423 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9424 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9425 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9426 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9427 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9428 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9429 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9430 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9431 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9432 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9433 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9434 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9435 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9436 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9437 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9438 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9439 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9440 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9441 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9442 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9443 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9444 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9445 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9446 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9447 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9448 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9449 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9450 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9451 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9452 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9453 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9454 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9455 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9456 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9457 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9458 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9459 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9460 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9461 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9462 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9463 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9464 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9465 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9466 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9467 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9468 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9469 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9470 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9471 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9472 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9473 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9474 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9475 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9476 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9477 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9478 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9479 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9480 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9481 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9482 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9483 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9486 Version 1.6.0 (2016-01-21)
9487 ==========================
9492 * The `#![no_std]` attribute causes a crate to not be linked to the
9493 standard library, but only the [core library][1.6co], as described
9494 in [RFC 1184]. The core library defines common types and traits but
9495 has no platform dependencies whatsoever, and is the basis for Rust
9496 software in environments that cannot support a full port of the
9497 standard library, such as operating systems. Most of the core
9498 library is now stable.
9504 [`Read::read_exact`],
9505 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9506 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9507 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9508 [`os::unix::fs::DirBuilderExt`],
9509 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9510 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9511 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9512 [`collections::hash_map::Drain`],
9513 [`collections::hash_map::HashMap::drain`],
9514 [`collections::hash_set::Drain`],
9515 [`collections::hash_set::HashSet::drain`],
9516 [`collections::binary_heap::Drain`],
9517 [`collections::binary_heap::BinaryHeap::drain`],
9518 [`Vec::extend_from_slice`] (renamed from `push_all`),
9519 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9520 [`RwLock::into_inner`],
9521 [`Iterator::min_by_key`] (renamed from `min_by`),
9522 [`Iterator::max_by_key`] (renamed from `max_by`).
9523 * The [core library][1.6co] is stable, as are most of its APIs.
9524 * [The `assert_eq!` macro supports arguments that don't implement
9525 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9527 * Several timer functions that take duration in milliseconds [are
9528 deprecated in favor of those that take `Duration`][1.6ms]. These
9529 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9530 `thread::park_timeout_ms`.
9531 * The algorithm by which `Vec` reserves additional elements was
9532 [tweaked to not allocate excessive space][1.6a] while still growing
9534 * `From` conversions are [implemented from integers to floats][1.6f]
9535 in cases where the conversion is lossless. Thus they are not
9536 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9537 or `f64`. They are also not implemented for `isize` and `usize`
9538 because the implementations would be platform-specific. `From` is
9539 also implemented from `f32` to `f64`.
9540 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9541 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9542 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9543 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9545 * Sorting slices that are already sorted [is 50% faster in some
9551 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9552 * Cargo build scripts can specify their dependencies by emitting the
9553 [`rerun-if-changed`][1.6rr] key.
9554 * crates.io will reject publication of crates with dependencies that
9555 have a wildcard version constraint. Crates with wildcard
9556 dependencies were seen to cause a variety of problems, as described
9557 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9559 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9560 release folder. A variety of artifacts that Cargo failed to clean
9561 are now correctly deleted.
9566 * The `unreachable_code` lint [warns when a function call's argument
9568 * The parser indicates [failures that may be caused by
9569 confusingly-similar Unicode characters][1.6uc]
9570 * Certain macro errors [are reported at definition time][1.6m], not
9576 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9577 environment variable when locating crates. This was a pre-cargo
9578 feature for integrating with the package manager that was
9579 accidentally never removed.
9580 * [A number of bugs were fixed in the privacy checker][1.6p] that
9581 could cause previously-accepted code to break.
9582 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9583 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9584 struct pattern syntax (`Foo(..)`) can no longer be used to match
9585 unit structs. This is a warning now, but will become an error in
9586 future releases. Patterns that share the same name as a const are
9588 * A bug was fixed that causes [rustc not to apply default type
9589 parameters][1.6xc] when resolving certain method implementations of
9590 traits defined in other crates.
9592 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9593 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9594 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9595 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9596 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9597 [1.6co]: http://doc.rust-lang.org/core/index.html
9598 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9599 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9600 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9601 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9602 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9603 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9604 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9605 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9606 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9607 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9608 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9609 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9610 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9611 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9612 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9613 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9614 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9615 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9616 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9617 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9618 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9619 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9620 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9621 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9622 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9623 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9624 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9625 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9626 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9627 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9628 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9629 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9630 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9631 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9632 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9633 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9634 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9635 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9636 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9637 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9638 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9641 Version 1.5.0 (2015-12-10)
9642 ==========================
9644 * ~700 changes, numerous bugfixes
9650 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9651 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9652 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9653 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9654 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9655 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9656 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9657 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9658 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9659 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9660 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9661 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9662 [`Path::read_link`], [`Path::symlink_metadata`],
9663 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9664 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9665 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9666 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9667 [`slice::split_first_mut`], [`slice::split_first`],
9668 [`slice::split_last_mut`], [`slice::split_last`],
9669 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9670 [`str::MatchIndices`], [`str::RMatchIndices`],
9671 [`str::match_indices`], [`str::rmatch_indices`],
9672 [`str::slice_mut_unchecked`], [`string::ParseError`].
9673 * Rust applications hosted on crates.io can be installed locally to
9674 `~/.cargo/bin` with the [`cargo install`] command. Among other
9675 things this makes it easier to augment Cargo with new subcommands:
9676 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9677 invoked as `cargo foo`.
9678 * Crates with wildcard (`*`) dependencies will [emit warnings when
9679 published][1.5w]. In 1.6 it will no longer be possible to publish
9680 crates with wildcard dependencies.
9685 * The rules determining when a particular lifetime must outlive
9686 a particular value (known as '[dropck]') have been [modified
9687 to not rely on parametricity][1.5p].
9688 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9689 and `Arc`][1.5a]. Because these smart pointer types implement
9690 `Deref`, this causes breakage in cases where the interior type
9691 contains methods of the same name.
9692 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9693 that they could drop their content. Soundness fix.
9694 * All method invocations are [properly checked][1.5wf1] for
9695 [well-formedness][1.5wf2]. Soundness fix.
9696 * Traits whose supertraits contain `Self` are [not object
9697 safe][1.5o]. Soundness fix.
9698 * Target specifications support a [`no_default_libraries`][1.5nd]
9699 setting that controls whether `-nodefaultlibs` is passed to the
9700 linker, and in turn the `is_like_windows` setting no longer affects
9701 the `-nodefaultlibs` flag.
9702 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9703 * The `#[inline]` and `#[repr]` attributes [can only appear
9704 in valid locations][1.5at].
9705 * Native libraries linked from the local crate are [passed to
9706 the linker before native libraries from upstream crates][1.5nl].
9707 * Two rarely-used attributes, `#[no_debug]` and
9708 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9709 * Negation of unsigned integers, which has been a warning for
9710 several releases, [is now behind a feature gate and will
9711 generate errors][1.5nu].
9712 * The parser accidentally accepted visibility modifiers on
9713 enum variants, a bug [which has been fixed][1.5ev].
9714 * [A bug was fixed that allowed `use` statements to import unstable
9720 * When evaluating expressions at compile-time that are not
9721 compile-time constants (const-evaluating expressions in non-const
9722 contexts), incorrect code such as overlong bitshifts and arithmetic
9723 overflow will [generate a warning instead of an error][1.5ce],
9724 delaying the error until runtime. This will allow the
9725 const-evaluator to be expanded in the future backwards-compatibly.
9726 * The `improper_ctypes` lint [no longer warns about using `isize` and
9727 `usize` in FFI][1.5ict].
9732 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9734 * `Default` is [implemented for mutable slices][1.5d].
9735 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9736 * There are now `From` conversions [between floating point
9737 types][1.5f] where the conversions are lossless.
9738 * There are now `From` conversions [between integer types][1.5i] where
9739 the conversions are lossless.
9740 * [`fs::Metadata` implements `Clone`][1.5fs].
9741 * The `parse` method [accepts a leading "+" when parsing
9743 * [`AsMut` is implemented for `Vec`][1.5am].
9744 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9745 been optimized][1.5cf] and no longer rely on the default impl.
9746 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9747 `unsafe extern "C"` function types now [implement `Clone`,
9748 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9749 `fmt::Debug` for up to 12 arguments][1.5fp].
9750 * [Dropping `Vec`s is much faster in unoptimized builds when the
9751 element types don't implement `Drop`][1.5dv].
9752 * A bug that caused in incorrect behavior when [combining `VecDeque`
9753 with zero-sized types][1.5vdz] was resolved.
9754 * [`PartialOrd` for slices is faster][1.5po].
9759 * [Crate metadata size was reduced by 20%][1.5md].
9760 * [Improvements to code generation reduced the size of libcore by 3.3
9761 MB and rustc's memory usage by 18MB][1.5m].
9762 * [Improvements to deref translation increased performance in
9763 unoptimized builds][1.5dr].
9764 * Various errors in trait resolution [are deduplicated to only be
9765 reported once][1.5te].
9766 * Rust has preliminary [support for rumprun kernels][1.5rr].
9767 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9769 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9770 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9771 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9772 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9773 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9774 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9775 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9776 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9777 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9778 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9779 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9780 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9781 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9782 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9783 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9784 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9785 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9786 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9787 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9788 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9789 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9790 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9791 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9792 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9793 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9794 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9795 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9796 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9797 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9798 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9799 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9800 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9801 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9802 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9803 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9804 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9805 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9806 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9807 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9808 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9809 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9810 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9811 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9812 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9813 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9814 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9815 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9816 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9817 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9818 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9819 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9820 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9821 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9822 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9823 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9824 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9825 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9826 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9827 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9828 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9829 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9830 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9831 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9832 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9833 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9834 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9835 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9836 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9837 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9838 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9839 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9840 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9841 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9842 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9843 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9844 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9845 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9846 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9847 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9848 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9849 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9850 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9851 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9852 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9853 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9854 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9855 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9856 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9857 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9859 Version 1.4.0 (2015-10-29)
9860 ==========================
9862 * ~1200 changes, numerous bugfixes
9867 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9868 GNU) are now supported and recommended for use.
9873 * [Several changes have been made to fix type soundness and improve
9874 the behavior of associated types][sound]. See [RFC 1214]. Although
9875 we have mostly introduced these changes as warnings this release, to
9876 become errors next release, there are still some scenarios that will
9877 see immediate breakage.
9878 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9879 line breaks in addition to `\n`][crlf].
9880 * [Loans of `'static` lifetime extend to the end of a function][stat].
9881 * [`str::parse` no longer introduces avoidable rounding error when
9882 parsing floating point numbers. Together with earlier changes to
9883 float formatting/output, "round trips" like f.to_string().parse()
9884 now preserve the value of f exactly. Additionally, leading plus
9885 signs are now accepted][fp3].
9891 * `use` statements that import multiple items [can now rename
9892 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9893 * [Binops work correctly on fat pointers][binfat].
9894 * `pub extern crate`, which does not behave as expected, [issues a
9895 warning][pec] until a better solution is found.
9900 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9901 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9902 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9903 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9904 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9905 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9906 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9907 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9908 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9909 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9910 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9911 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9912 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9913 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9914 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9915 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9916 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9917 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9919 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9920 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9921 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9922 `f64::from_str_radix`.
9923 * [Reverse-searching strings is faster with the 'two-way'
9925 * [`std::io::copy` allows `?Sized` arguments][cc].
9926 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9927 [override `count`, `nth` and `last` with an *O*(1)
9928 implementation][it].
9929 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9930 * [`IntoRawFd` has been added to the Unix-specific prelude,
9931 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9933 * [`Extend<String>` and `FromIterator<String` are both implemented for
9935 * [`IntoIterator` is implemented for references to `Option` and
9937 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9938 Copy`][ext] as part of [RFC 839]. This will cause type inference
9939 breakage in rare situations.
9940 * [`BinaryHeap` implements `Debug`][bh2].
9941 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9943 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9944 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9945 * [String comparison is faster][faststr].
9946 * `&mut T` where `T: std::fmt::Write` [also implements
9947 `std::fmt::Write`][mutw].
9948 * [A stable regression in `VecDeque::push_back` and other
9949 capacity-altering methods that caused panics for zero-sized types
9951 * [Function pointers implement traits for up to 12 parameters][fp2].
9956 * The compiler [no longer uses the 'morestack' feature to prevent
9957 stack overflow][mm]. Instead it uses guard pages and stack
9958 probes (though stack probes are not yet implemented on any platform
9960 * [The compiler matches traits faster when projections are involved][p].
9961 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9963 * [Cargo now displays useful information about what its doing during
9964 `cargo update`][cu].
9966 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9967 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9968 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9969 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9970 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9971 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9972 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9973 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9974 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9975 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9976 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9977 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9978 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9979 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9980 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9981 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9982 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9983 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9984 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9985 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9986 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9987 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9988 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9989 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9990 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9991 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9992 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9993 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9994 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9995 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9996 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9997 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9998 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9999 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
10000 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
10001 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
10002 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
10003 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
10004 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
10005 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
10006 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
10007 [bh2]: https://github.com/rust-lang/rust/pull/28156
10008 [binfat]: https://github.com/rust-lang/rust/pull/28270
10009 [bm]: https://github.com/rust-lang/rust/pull/28197
10010 [cc]: https://github.com/rust-lang/rust/pull/27531
10011 [crlf]: https://github.com/rust-lang/rust/pull/28034
10012 [cu]: https://github.com/rust-lang/cargo/pull/1931
10013 [d]: https://github.com/rust-lang/rust/pull/27825
10014 [dep]: https://github.com/rust-lang/rust/pull/28339
10015 [es]: https://github.com/rust-lang/rust/pull/27956
10016 [ext]: https://github.com/rust-lang/rust/pull/28094
10017 [faststr]: https://github.com/rust-lang/rust/pull/28338
10018 [ffi]: https://github.com/rust-lang/rust/pull/28779
10019 [fp]: https://github.com/rust-lang/rust/pull/28268
10020 [fp2]: https://github.com/rust-lang/rust/pull/28560
10021 [fp3]: https://github.com/rust-lang/rust/pull/27307
10022 [i]: https://github.com/rust-lang/rust/pull/27451
10023 [into2]: https://github.com/rust-lang/rust/pull/28039
10024 [it]: https://github.com/rust-lang/rust/pull/27652
10025 [mm]: https://github.com/rust-lang/rust/pull/27338
10026 [mutw]: https://github.com/rust-lang/rust/pull/28368
10027 [sound]: https://github.com/rust-lang/rust/pull/27641
10028 [p]: https://github.com/rust-lang/rust/pull/27866
10029 [pec]: https://github.com/rust-lang/rust/pull/28486
10030 [pr]: https://github.com/rust-lang/rust/pull/27896
10031 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10032 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
10033 [s]: https://github.com/rust-lang/rust/pull/27474
10034 [stab]: https://github.com/rust-lang/rust/pull/28339
10035 [stat]: https://github.com/rust-lang/rust/pull/28321
10036 [vd]: https://github.com/rust-lang/rust/pull/28494
10038 Version 1.3.0 (2015-09-17)
10039 ==============================
10041 * ~900 changes, numerous bugfixes
10046 * The [new object lifetime defaults][nold] have been [turned
10047 on][nold2] after a cycle of warnings about the change. Now types
10048 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
10049 being interpreted as `&'a Box<Trait+'a>` to `&'a
10050 Box<Trait+'static>`.
10051 * [The Rustonomicon][nom] is a new book in the official documentation
10052 that dives into writing unsafe Rust.
10053 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
10054 timekeeping is employed by other std APIs, as well as out-of-tree
10060 * The [new object lifetime defaults][nold] have been [turned
10061 on][nold2] after a cycle of warnings about the change.
10062 * There is a known [regression][lr] in how object lifetime elision is
10063 interpreted, the proper solution for which is undetermined.
10064 * The `#[prelude_import]` attribute, an internal implementation
10065 detail, was accidentally stabilized previously. [It has been put
10066 behind the `prelude_import` feature gate][pi]. This change is
10067 believed to break no existing code.
10068 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
10069 [more sane for dynamically sized types][dst3]. Code that relied on
10070 the previous behavior is thought to be broken.
10071 * The `dropck` rules, which checks that destructors can't access
10072 destroyed values, [have been updated][dropck] to match the
10073 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
10074 cause some previously-compiling code to no longer build.
10079 * The [new object lifetime defaults][nold] have been [turned
10080 on][nold2] after a cycle of warnings about the change.
10081 * Semicolons may [now follow types and paths in
10082 macros](https://github.com/rust-lang/rust/pull/27000).
10083 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
10084 [more sane for dynamically sized types][dst3]. Code that relied on
10085 the previous behavior is not known to exist, and suspected to be
10087 * `'static` variables [may now be recursive][st].
10088 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
10089 implementations correctly.
10090 * The `dropck` rules, which checks that destructors can't access
10091 destroyed values, [have been updated][dropck] to match the
10097 * The [`Duration`] API, [has been stabilized][ds], as well as the
10098 `std::time` module, which presently contains only `Duration`.
10099 * `Box<str>` and `Box<[T]>` both implement `Clone`.
10100 * The owned C string, [`CString`], implements [`Borrow`] and the
10101 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
10102 these allow C strings to be borrowed and cloned in generic code.
10103 * [`CStr`] implements [`Debug`].
10104 * [`AtomicPtr`] implements [`Debug`].
10105 * [`Error`] trait objects [can be downcast to their concrete types][e]
10106 in many common configurations, using the [`is`], [`downcast`],
10107 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
10109 * Searching for substrings now [employs the two-way algorithm][search]
10110 instead of doing a naive search. This gives major speedups to a
10111 number of methods, including [`contains`][sc], [`find`][sf],
10112 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
10113 [`ends_with`][sew] are also faster.
10114 * The performance of `PartialEq` for slices is [much faster][ps].
10115 * The [`Hash`] trait offers the default method, [`hash_slice`], which
10116 is overridden and optimized by the implementations for scalars.
10117 * The [`Hasher`] trait now has a number of specialized `write_*`
10118 methods for primitive types, for efficiency.
10119 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
10120 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
10121 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
10122 of [`std::error::Error::cause`][iec] also delegates to the inner
10124 * [`process::Child`][pc] gained the [`id`] method, which returns a
10125 `u32` representing the platform-specific process identifier.
10126 * The [`connect`] method on slices is deprecated, replaced by the new
10127 [`join`] method (note that both of these are on the *unstable*
10128 [`SliceConcatExt`] trait, but through the magic of the prelude are
10129 available to stable code anyway).
10130 * The [`Div`] operator is implemented for [`Wrapping`] types.
10131 * [`DerefMut` is implemented for `String`][dms].
10132 * Performance of SipHash (the default hasher for `HashMap`) is
10133 [better for long data][sh].
10134 * [`AtomicPtr`] implements [`Send`].
10135 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
10136 are now [specialized to use uninitialized buffers for increased
10138 * Lifetime parameters of foreign functions [are now resolved
10144 * Rust can now, with some coercion, [produce programs that run on
10145 Windows XP][xp], though XP is not considered a supported platform.
10146 * Porting Rust on Windows from the GNU toolchain to MSVC continues
10147 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
10148 recommended for use in 1.3, though should be fully-functional
10149 in the [64-bit 1.4 beta][b14].
10150 * On Fedora-based systems installation will [properly configure the
10151 dynamic linker][fl].
10152 * The compiler gained many new extended error descriptions, which can
10153 be accessed with the `--explain` flag.
10154 * The `dropck` pass, which checks that destructors can't access
10155 destroyed values, [has been rewritten][27261]. This fixes some
10156 soundness holes, and as such will cause some previously-compiling
10157 code to no longer build.
10158 * `rustc` now uses [LLVM to write archive files where possible][ar].
10159 Eventually this will eliminate the compiler's dependency on the ar
10161 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
10162 supported FreeBSD on x86_64).
10163 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
10164 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
10166 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
10167 will kill the process instead of leaking][nlp].
10169 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
10170 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
10171 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
10172 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
10173 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
10174 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10175 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10176 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
10177 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
10178 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
10179 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
10180 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
10181 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
10182 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
10183 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
10184 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
10185 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
10186 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
10187 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10188 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
10189 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
10190 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
10191 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
10192 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
10193 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
10194 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
10195 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
10196 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
10197 [ar]: https://github.com/rust-lang/rust/pull/26926
10198 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
10199 [dms]: https://github.com/rust-lang/rust/pull/26241
10200 [27261]: https://github.com/rust-lang/rust/pull/27261
10201 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10202 [ds]: https://github.com/rust-lang/rust/pull/26818
10203 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
10204 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
10205 [dst3]: https://github.com/rust-lang/rust/pull/27351
10206 [e]: https://github.com/rust-lang/rust/pull/24793
10207 [f]: https://github.com/rust-lang/rust/pull/26588
10208 [26959]: https://github.com/rust-lang/rust/pull/26959
10209 [fl]: https://github.com/rust-lang/rust-installer/pull/41
10210 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
10211 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
10212 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
10213 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
10214 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
10215 [lic]: https://github.com/rust-lang/rust/pull/26583
10216 [lnu]: https://github.com/rust-lang/rust/pull/27026
10217 [lr]: https://github.com/rust-lang/rust/issues/27248
10218 [lum]: https://github.com/rust-lang/rust/pull/26378
10219 [lur]: https://github.com/rust-lang/rust/pull/26783
10220 [nlp]: https://github.com/rust-lang/rust/pull/27176
10221 [nold2]: https://github.com/rust-lang/rust/pull/27045
10222 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
10223 [nom]: http://doc.rust-lang.org/nightly/nomicon/
10224 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
10225 [pi]: https://github.com/rust-lang/rust/pull/26699
10226 [ps]: https://github.com/rust-lang/rust/pull/26884
10227 [rte]: https://github.com/rust-lang/rust/pull/26950
10228 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
10229 [search]: https://github.com/rust-lang/rust/pull/26327
10230 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
10231 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
10232 [sh]: https://github.com/rust-lang/rust/pull/27280
10233 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
10234 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
10235 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
10236 [st]: https://github.com/rust-lang/rust/pull/26630
10237 [win1]: https://github.com/rust-lang/rust/pull/26569
10238 [win2]: https://github.com/rust-lang/rust/pull/26741
10239 [win3]: https://github.com/rust-lang/rust/pull/26741
10240 [win4]: https://github.com/rust-lang/rust/pull/27210
10241 [xp]: https://github.com/rust-lang/rust/pull/26569
10243 Version 1.2.0 (2015-08-07)
10244 ==========================
10246 * ~1200 changes, numerous bugfixes
10251 * [Dynamically-sized-type coercions][dst] allow smart pointer types
10252 like `Rc` to contain types without a fixed size, arrays and trait
10253 objects, finally enabling use of `Rc<[T]>` and completing the
10254 implementation of DST.
10255 * [Parallel codegen][parcodegen] is now working again, which can
10256 substantially speed up large builds in debug mode; It also gets
10257 another ~33% speedup when bootstrapping on a 4 core machine (using 8
10258 jobs). It's not enabled by default, but will be "in the near
10259 future". It can be activated with the `-C codegen-units=N` flag to
10261 * This is the first release with [experimental support for linking
10262 with the MSVC linker and lib C on Windows (instead of using the GNU
10263 variants via MinGW)][win]. It is yet recommended only for the most
10264 intrepid Rustaceans.
10265 * Benchmark compilations are showing a 30% improvement in
10266 bootstrapping over 1.1.
10271 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
10272 unicode case mapping, which is a previously-planned change in
10273 behavior and considered a bugfix.
10274 * [`mem::align_of`] now specifies [the *minimum alignment* for
10275 T][align], which is usually the alignment programs are interested
10276 in, and the same value reported by clang's
10277 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
10279 * [The `#[packed]` attribute is no longer silently accepted by the
10280 compiler][packed]. This attribute did nothing and code that
10281 mentioned it likely did not work as intended.
10282 * Associated type defaults are [now behind the
10283 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
10284 defaults *did not work*, but could be mentioned syntactically. As
10285 such this breakage has minimal impact.
10290 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
10291 matching against dereferenceable values.
10296 * The [`Extend`] trait, which grows a collection from an iterator, is
10297 implemented over iterators of references, for `String`, `Vec`,
10298 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
10299 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
10300 * The [`iter::once`] function returns an iterator that yields a single
10301 element, and [`iter::empty`] returns an iterator that yields no
10303 * The [`matches`] and [`rmatches`] methods on `str` return iterators
10304 over substring matches.
10305 * [`Cell`] and [`RefCell`] both implement `Eq`.
10306 * A number of methods for wrapping arithmetic are added to the
10307 integral types, [`wrapping_div`], [`wrapping_rem`],
10308 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10309 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10310 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10311 type.. It is illegal for the default arithmetic operations in Rust
10312 to overflow; the desire to wrap must be explicit.
10313 * The `{:#?}` formatting specifier [displays the alternate,
10314 pretty-printed][debugfmt] form of the `Debug` formatter. This
10315 feature was actually introduced prior to 1.0 with little
10317 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10318 for writing data to formatted strings, similar to [`io::Write`].
10319 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10320 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10321 are used by code generators to emit implementations of [`Debug`].
10322 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10323 methods that convert case, following Unicode case mapping.
10324 * It is now easier to handle poisoned locks. The [`PoisonError`]
10325 type, returned by failing lock operations, exposes `into_inner`,
10326 `get_ref`, and `get_mut`, which all give access to the inner lock
10327 guard, and allow the poisoned lock to continue to operate. The
10328 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10329 poisoned lock without attempting to take the lock.
10330 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10331 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10332 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10333 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10335 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10341 * `rustc` employs smarter heuristics for guessing at [typos].
10342 * `rustc` emits more efficient code for [no-op conversions between
10343 unsafe pointers][nop].
10344 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10345 resulting in faster compile times and smaller code.
10347 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10348 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10349 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10350 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10351 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10352 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10353 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10354 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10355 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10356 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10357 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10358 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10359 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10360 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10361 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10362 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10363 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10364 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10365 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10366 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10367 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10368 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10369 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10370 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10371 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10372 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10373 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10374 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10375 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10376 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10377 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10378 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10379 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10380 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10381 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10382 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10383 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10384 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10385 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10386 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10387 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10388 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10389 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10390 [align]: https://github.com/rust-lang/rust/pull/25646
10391 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10392 [typos]: https://github.com/rust-lang/rust/pull/26087
10393 [nop]: https://github.com/rust-lang/rust/pull/26336
10394 [fat]: https://github.com/rust-lang/rust/pull/26411
10395 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10396 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10397 [packed]: https://github.com/rust-lang/rust/pull/25541
10398 [ad]: https://github.com/rust-lang/rust/pull/27382
10399 [win]: https://github.com/rust-lang/rust/pull/25350
10401 Version 1.1.0 (2015-06-25)
10402 =========================
10404 * ~850 changes, numerous bugfixes
10409 * The [`std::fs` module has been expanded][fs] to expand the set of
10410 functionality exposed:
10411 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10412 don't incur a syscall on some platforms.
10413 * A `symlink_metadata` function has been added.
10414 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10415 access to all underlying information.
10416 * The compiler now contains extended explanations of many errors. When an error
10417 with an explanation occurs the compiler suggests using the `--explain` flag
10418 to read the explanation. Error explanations are also [available online][err-index].
10419 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10420 well as other work, the time to bootstrap the compiler decreased by
10426 * The [`str::split_whitespace`] method splits a string on unicode
10427 whitespace boundaries.
10428 * On both Windows and Unix, new extension traits provide conversion of
10429 I/O types to and from the underlying system handles. On Unix, these
10430 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10431 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10432 `TcpListener`, and `UpdSocket`. Further implementations for
10433 `std::process` will be stabilized later.
10434 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10435 Windows, symlinks can be created with
10436 `std::os::windows::symlink_dir` and
10437 `std::os::windows::symlink_file`.
10438 * The `mpsc::Receiver` type can now be converted into an iterator with
10439 `into_iter` on the [`IntoIterator`] trait.
10440 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10441 implementation of the [`From`] trait.
10442 * The `Debug` implementation for `RangeFull` [creates output that is
10443 more consistent with other implementations][rf].
10444 * [`Debug` is implemented for `File`][file].
10445 * The `Default` implementation for `Arc` [no longer requires `Sync +
10447 * [The `Iterator` methods `count`, `nth`, and `last` have been
10448 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10449 * Incorrect handling of paths on Windows has been improved in both the
10450 compiler and the standard library.
10451 * [`AtomicPtr` gained a `Default` implementation][ap].
10452 * In accordance with Rust's policy on arithmetic overflow `abs` now
10453 [panics on overflow when debug assertions are enabled][abs].
10454 * The [`Cloned`] iterator, which was accidentally left unstable for
10455 1.0 [has been stabilized][c].
10456 * The [`Incoming`] iterator, which iterates over incoming TCP
10457 connections, and which was accidentally unnamable in 1.0, [is now
10458 properly exported][inc].
10459 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10460 `sift_up` or `sift_down` panic][bh].
10461 * The [`split_off`] method of `LinkedList` [no longer corrupts
10462 the list in certain scenarios][ll].
10467 * Type checking performance [has improved notably][sk] with
10468 [multiple improvements][pre].
10469 * The compiler [suggests code changes][ch] for more errors.
10470 * rustc and it's build system have experimental support for [building
10471 toolchains against MUSL][m] instead of glibc on Linux.
10472 * The compiler defines the `target_env` cfg value, which is used for
10473 distinguishing toolchains that are otherwise for the same
10474 platform. Presently this is set to `gnu` for common GNU Linux
10475 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10476 * The [`cargo rustc`][crc] command invokes a build with custom flags
10478 * [Android executables are always position independent][pie].
10479 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10480 with `Drop`][24935].
10482 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10483 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10484 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10485 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10486 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10487 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10488 [rf]: https://github.com/rust-lang/rust/pull/24491
10489 [err-index]: https://doc.rust-lang.org/error-index.html
10490 [sk]: https://github.com/rust-lang/rust/pull/24615
10491 [pre]: https://github.com/rust-lang/rust/pull/25323
10492 [file]: https://github.com/rust-lang/rust/pull/24598
10493 [ch]: https://github.com/rust-lang/rust/pull/24683
10494 [arc]: https://github.com/rust-lang/rust/pull/24695
10495 [si]: https://github.com/rust-lang/rust/pull/24701
10496 [ap]: https://github.com/rust-lang/rust/pull/24834
10497 [m]: https://github.com/rust-lang/rust/pull/24777
10498 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10499 [crc]: https://github.com/rust-lang/cargo/pull/1568
10500 [pie]: https://github.com/rust-lang/rust/pull/24953
10501 [abs]: https://github.com/rust-lang/rust/pull/25441
10502 [c]: https://github.com/rust-lang/rust/pull/25496
10503 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10504 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10505 [inc]: https://github.com/rust-lang/rust/pull/25522
10506 [bh]: https://github.com/rust-lang/rust/pull/25856
10507 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10508 [ll]: https://github.com/rust-lang/rust/pull/26022
10509 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10510 [24935]: https://github.com/rust-lang/rust/pull/24935
10512 Version 1.0.0 (2015-05-15)
10513 ========================
10515 * ~1500 changes, numerous bugfixes
10520 * The vast majority of the standard library is now `#[stable]`. It is
10521 no longer possible to use unstable features with a stable build of
10523 * Many popular crates on [crates.io] now work on the stable release
10525 * Arithmetic on basic integer types now [checks for overflow in debug
10531 * Several [restrictions have been added to trait coherence][coh] in
10532 order to make it easier for upstream authors to change traits
10533 without breaking downstream code.
10534 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10535 improve error messages and macro behavior. For example, `0b1234` is
10536 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10537 * Trait bounds [are always invariant][inv], eliminating the need for
10538 the `PhantomFn` and `MarkerTrait` lang items, which have been
10540 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10541 "foo" as bar` syntax has been replaced with `extern crate foo as
10542 bar`, and Cargo now automatically translates "-" in *package* names
10543 to underscore for the crate name.
10544 * [Lifetime shadowing is an error][lt].
10545 * [`Send` no longer implies `'static`][send-rfc].
10546 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10547 `MyType::default()`.
10548 * Primitive types [now have inherent methods][prim-inherent],
10549 obviating the need for extension traits like `SliceExt`.
10550 * Methods with `Self: Sized` in their `where` clause are [considered
10551 object-safe][self-sized], allowing many extension traits like
10552 `IteratorExt` to be merged into the traits they extended.
10553 * You can now [refer to associated types][assoc-where] whose
10554 corresponding trait bounds appear only in a `where` clause.
10555 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10556 like `Send` and `Sync` are now library-defined.
10557 * A [Reflect trait][reflect] was introduced, which means that
10558 downcasting via the `Any` trait is effectively limited to concrete
10559 types. This helps retain the potentially-important "parametricity"
10560 property: generic code cannot behave differently for different type
10561 arguments except in minor ways.
10562 * The `unsafe_destructor` feature is now deprecated in favor of the
10563 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10569 * The `thread_local` module [has been renamed to `std::thread`][th].
10570 * The methods of `IteratorExt` [have been moved to the `Iterator`
10571 trait itself][23300].
10572 * Several traits that implement Rust's conventions for type
10573 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10574 [centralized in the `std::convert` module][con].
10575 * The `FromError` trait [was removed in favor of `From`][fe].
10576 * The basic sleep function [has moved to
10577 `std::thread::sleep_ms`][slp].
10578 * The `splitn` function now takes an `n` parameter that represents the
10579 number of items yielded by the returned iterator [instead of the
10580 number of 'splits'][spl].
10581 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10582 * [Derived implementations of `PartialOrd` now order enums according
10583 to their explicitly-assigned discriminants][po].
10584 * [Methods for searching strings are generic over `Pattern`s][pat],
10585 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10587 * [In method resolution, object methods are resolved before inherent
10589 * [`String::from_str` has been deprecated in favor of the `From` impl,
10590 `String::from`][24517].
10591 * [`io::Error` implements `Sync`][ios].
10592 * [The `words` method on `&str` has been replaced with
10593 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10595 * The new path and IO modules are complete and `#[stable]`. This
10596 was the major library focus for this cycle.
10597 * The path API was [revised][path-normalize] to normalize `.`,
10598 adjusting the tradeoffs in favor of the most common usage.
10599 * A large number of remaining APIs in `std` were also stabilized
10600 during this cycle; about 75% of the non-deprecated API surface
10602 * The new [string pattern API][string-pattern] landed, which makes
10603 the string slice API much more internally consistent and flexible.
10604 * A new set of [generic conversion traits][conversion] replaced
10605 many existing ad hoc traits.
10606 * Generic numeric traits were [completely removed][num-traits]. This
10607 was made possible thanks to inherent methods for primitive types,
10608 and the removal gives maximal flexibility for designing a numeric
10609 hierarchy in the future.
10610 * The `Fn` traits are now related via [inheritance][fn-inherit]
10611 and provide ergonomic [blanket implementations][fn-blanket].
10612 * The `Index` and `IndexMut` traits were changed to
10613 [take the index by value][index-value], enabling code like
10614 `hash_map["string"]` to work.
10615 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10616 `Copy` data is known to be `Clone` as well.
10621 * Many errors now have extended explanations that can be accessed with
10622 the `--explain` flag to `rustc`.
10623 * Many new examples have been added to the standard library
10625 * rustdoc has received a number of improvements focused on completion
10627 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10628 * Much headway was made on ecosystem-wide CI, making it possible
10629 to [compare builds for breakage][ci-compare].
10632 [crates.io]: http://crates.io
10633 [clo]: https://github.com/rust-lang/rust/pull/24034
10634 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10635 [con]: https://github.com/rust-lang/rust/pull/23875
10636 [cr]: https://github.com/rust-lang/rust/pull/23419
10637 [fe]: https://github.com/rust-lang/rust/pull/23879
10638 [23300]: https://github.com/rust-lang/rust/pull/23300
10639 [inv]: https://github.com/rust-lang/rust/pull/23938
10640 [ios]: https://github.com/rust-lang/rust/pull/24133
10641 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10642 [lt]: https://github.com/rust-lang/rust/pull/24057
10643 [meth]: https://github.com/rust-lang/rust/pull/24056
10644 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10645 [po]: https://github.com/rust-lang/rust/pull/24270
10646 [24517]: https://github.com/rust-lang/rust/pull/24517
10647 [slp]: https://github.com/rust-lang/rust/pull/23949
10648 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10649 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10650 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10651 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10652 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10653 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10654 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10655 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10656 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10657 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10658 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10659 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10660 [reflect]: https://github.com/rust-lang/rust/pull/23712
10661 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10662 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10663 [index-value]: https://github.com/rust-lang/rust/pull/23601
10664 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10665 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10666 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10667 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10668 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10669 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10672 Version 1.0.0-alpha.2 (2015-02-20)
10673 =====================================
10675 * ~1300 changes, numerous bugfixes
10679 * The various I/O modules were [overhauled][io-rfc] to reduce
10680 unnecessary abstractions and provide better interoperation with
10681 the underlying platform. The old `io` module remains temporarily
10683 * The standard library now [participates in feature gating][feat],
10684 so use of unstable libraries now requires a `#![feature(...)]`
10685 attribute. The impact of this change is [described on the
10686 forum][feat-forum]. [RFC][feat-rfc].
10690 * `for` loops [now operate on the `IntoIterator` trait][into],
10691 which eliminates the need to call `.iter()`, etc. to iterate
10692 over collections. There are some new subtleties to remember
10693 though regarding what sort of iterators various types yield, in
10694 particular that `for foo in bar { }` yields values from a move
10695 iterator, destroying the original collection. [RFC][into-rfc].
10696 * Objects now have [default lifetime bounds][obj], so you don't
10697 have to write `Box<Trait+'static>` when you don't care about
10698 storing references. [RFC][obj-rfc].
10699 * In types that implement `Drop`, [lifetimes must outlive the
10700 value][drop]. This will soon make it possible to safely
10701 implement `Drop` for types where `#[unsafe_destructor]` is now
10702 required. Read the [gorgeous RFC][drop-rfc] for details.
10703 * The fully qualified <T as Trait>::X syntax lets you set the Self
10704 type for a trait method or associated type. [RFC][ufcs-rfc].
10705 * References to types that implement `Deref<U>` now [automatically
10706 coerce to references][deref] to the dereferenced type `U`,
10707 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10708 should eliminate many unsightly uses of `&*`, as when converting
10709 from references to vectors into references to
10710 slices. [RFC][deref-rfc].
10711 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10712 `|:|`) is obsolete and closure kind is inferred from context.
10713 * [`Self` is a keyword][Self].
10717 * The `Show` and `String` formatting traits [have been
10718 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10719 their related purposes. Automatically getting a string
10720 conversion to use with `format!("{:?}", something_to_debug)` is
10721 now written `#[derive(Debug)]`.
10722 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10723 OsStr}`, provide strings in platform-specific encodings for easier
10724 interop with system APIs. [RFC][osstr-rfc].
10725 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10726 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10727 creating raw pointers.
10731 * Certain long error messages of the form 'expected foo found bar'
10732 are now [split neatly across multiple
10733 lines][multiline]. Examples in the PR.
10734 * On Unix Rust can be [uninstalled][un] by running
10735 `/usr/local/lib/rustlib/uninstall.sh`.
10736 * The `#[rustc_on_unimplemented]` attribute, requiring the
10737 'on_unimplemented' feature, lets rustc [display custom error
10738 messages when a trait is expected to be implemented for a type
10743 * Rust is tested against a [LALR grammar][lalr], which parses
10744 almost all the Rust files that rustc does.
10746 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10747 [close]: https://github.com/rust-lang/rust/pull/21843
10748 [deref]: https://github.com/rust-lang/rust/pull/21351
10749 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10750 [drop]: https://github.com/rust-lang/rust/pull/21972
10751 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10752 [feat]: https://github.com/rust-lang/rust/pull/21248
10753 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10754 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10755 [fmt]: https://github.com/rust-lang/rust/pull/21457
10756 [into]: https://github.com/rust-lang/rust/pull/20790
10757 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10758 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10759 [lalr]: https://github.com/rust-lang/rust/pull/21452
10760 [multiline]: https://github.com/rust-lang/rust/pull/19870
10761 [obj]: https://github.com/rust-lang/rust/pull/22230
10762 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10763 [onun]: https://github.com/rust-lang/rust/pull/20889
10764 [osstr]: https://github.com/rust-lang/rust/pull/21488
10765 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10766 [Self]: https://github.com/rust-lang/rust/pull/22158
10767 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10768 [un]: https://github.com/rust-lang/rust/pull/22256
10771 Version 1.0.0-alpha (2015-01-09)
10772 ==================================
10774 * ~2400 changes, numerous bugfixes
10778 * The language itself is considered feature complete for 1.0,
10779 though there will be many usability improvements and bugfixes
10780 before the final release.
10781 * Nearly 50% of the public API surface of the standard library has
10782 been declared 'stable'. Those interfaces are unlikely to change
10784 * The long-running debate over integer types has been
10785 [settled][ints]: Rust will ship with types named `isize` and
10786 `usize`, rather than `int` and `uint`, for pointer-sized
10787 integers. Guidelines will be rolled out during the alpha cycle.
10788 * Most crates that are not `std` have been moved out of the Rust
10789 distribution into the Cargo ecosystem so they can evolve
10790 separately and don't need to be stabilized as quickly, including
10791 'time', 'getopts', 'num', 'regex', and 'term'.
10792 * Documentation continues to be expanded with more API coverage, more
10793 examples, and more in-depth explanations. The guides have been
10794 consolidated into [The Rust Programming Language][trpl].
10795 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10796 * All official Rust binary installers now come with [Cargo], the
10797 Rust package manager.
10801 * Closures have been [completely redesigned][unboxed] to be
10802 implemented in terms of traits, can now be used as generic type
10803 bounds and thus monomorphized and inlined, or via an opaque
10804 pointer (boxed) as in the old system. The new system is often
10805 referred to as 'unboxed' closures.
10806 * Traits now support [associated types][assoc], allowing families
10807 of related types to be defined together and used generically in
10809 * Enum variants are [namespaced by their type names][enum].
10810 * [`where` clauses][where] provide a more versatile and attractive
10811 syntax for specifying generic bounds, though the previous syntax
10813 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10815 * Rust [no longer has a runtime][rt] of any description, and only
10816 supports OS threads, not green threads.
10817 * At long last, Rust has been overhauled for 'dynamically-sized
10818 types' ([DST]), which integrates 'fat pointers' (object types,
10819 arrays, and `str`) more deeply into the type system, making it
10821 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10822 `..j` that produce range types and which, when combined with the
10823 `Index` operator and multidispatch, leads to a convenient slice
10824 notation, `[i..j]`.
10825 * The new range syntax revealed an ambiguity in the fixed-length
10826 array syntax, so now fixed length arrays [are written `[T;
10828 * The `Copy` trait is no longer implemented automatically. Unsafe
10829 pointers no longer implement `Sync` and `Send` so types
10830 containing them don't automatically either. `Sync` and `Send`
10831 are now 'unsafe traits' so one can "forcibly" implement them via
10832 `unsafe impl` if a type confirms to the requirements for them
10833 even though the internals do not (e.g. structs containing unsafe
10834 pointers like `Arc`). These changes are intended to prevent some
10835 footguns and are collectively known as [opt-in built-in
10836 traits][oibit] (though `Sync` and `Send` will soon become pure
10837 library types unknown to the compiler).
10838 * Operator traits now take their operands [by value][ops], and
10839 comparison traits can use multidispatch to compare one type
10840 against multiple other types, allowing e.g. `String` to be
10841 compared with `&str`.
10842 * `if let` and `while let` are no longer feature-gated.
10843 * Rust has adopted a more [uniform syntax for escaping unicode
10844 characters][unicode].
10845 * `macro_rules!` [has been declared stable][mac]. Though it is a
10846 flawed system it is sufficiently popular that it must be usable
10847 for 1.0. Effort has gone into [future-proofing][mac-future] it
10848 in ways that will allow other macro systems to be developed in
10849 parallel, and won't otherwise impact the evolution of the
10851 * The prelude has been [pared back significantly][prelude] such
10852 that it is the minimum necessary to support the most pervasive
10853 code patterns, and through [generalized where clauses][where]
10854 many of the prelude extension traits have been consolidated.
10855 * Rust's rudimentary reflection [has been removed][refl], as it
10856 incurred too much code generation for little benefit.
10857 * [Struct variants][structvars] are no longer feature-gated.
10858 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10859 known as 'higher-ranked trait bounds', this crucially allows
10860 unboxed closures to work.
10861 * Macros invocations surrounded by parens or square brackets and
10862 not terminated by a semicolon are [parsed as
10863 expressions][macros], which makes expressions like `vec![1i32,
10864 2, 3].len()` work as expected.
10865 * Trait objects now implement their traits automatically, and
10866 traits that can be coerced to objects now must be [object
10868 * Automatically deriving traits is now done with `#[derive(...)]`
10869 not `#[deriving(...)]` for [consistency with other naming
10870 conventions][derive].
10871 * Importing the containing module or enum at the same time as
10872 items or variants they contain is [now done with `self` instead
10873 of `mod`][self], as in use `foo::{self, bar}`
10874 * Glob imports are no longer feature-gated.
10875 * The `box` operator and `box` patterns have been feature-gated
10876 pending a redesign. For now unique boxes should be allocated
10877 like other containers, with `Box::new`.
10881 * A [series][coll1] of [efforts][coll2] to establish
10882 [conventions][coll3] for collections types has resulted in API
10883 improvements throughout the standard library.
10884 * New [APIs for error handling][err] provide ergonomic interop
10885 between error types, and [new conventions][err-conv] describe
10886 more clearly the recommended error handling strategies in Rust.
10887 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10888 it is easier to discuss failure in the context of error handling
10889 without making clarifications as to whether you are referring to
10890 the 'fail' macro or failure more generally.
10891 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10892 syscall when available.
10893 * The 'serialize' crate has been renamed 'rustc-serialize' and
10894 moved out of the distribution to Cargo. Although it is widely
10895 used now, it is expected to be superseded in the near future.
10896 * The `Show` formatter, typically implemented with
10897 `#[derive(Show)]` is [now requested with the `{:?}`
10898 specifier][show] and is intended for use by all types, for uses
10899 such as `println!` debugging. The new `String` formatter must be
10900 implemented by hand, uses the `{}` specifier, and is intended
10901 for full-fidelity conversions of things that can logically be
10902 represented as strings.
10906 * [Flexible target specification][flex] allows rustc's code
10907 generation to be configured to support otherwise-unsupported
10909 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10910 respective debuggers with Rust-appropriate pretty-printing.
10911 * The Windows installation of Rust is distributed with the
10912 MinGW components currently required to link binaries on that
10917 * Nullable enum optimizations have been extended to more types so
10918 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10919 space than the inner types themselves.
10920 * Work has begun on supporting AArch64.
10922 [Cargo]: https://crates.io
10923 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10924 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10925 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10926 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10927 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10928 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10929 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10930 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10931 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10932 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10933 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10934 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10935 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10936 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10937 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10938 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10939 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10940 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10941 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10942 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10943 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10944 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10945 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10946 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10947 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10948 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10949 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10950 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10951 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10952 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10953 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10954 [trpl]: https://doc.rust-lang.org/book/index.html
10955 [rbe]: http://rustbyexample.com/
10958 Version 0.12.0 (2014-10-09)
10959 =============================
10961 * ~1900 changes, numerous bugfixes
10965 * The introductory documentation (now called The Rust Guide) has
10966 been completely rewritten, as have a number of supplementary
10968 * Rust's package manager, Cargo, continues to improve and is
10969 sometimes considered to be quite awesome.
10970 * Many API's in `std` have been reviewed and updated for
10971 consistency with the in-development Rust coding
10972 guidelines. The standard library documentation tracks
10973 stabilization progress.
10974 * Minor libraries have been moved out-of-tree to the rust-lang org
10975 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10976 be installed with Cargo.
10977 * Lifetime elision allows lifetime annotations to be left off of
10978 function declarations in many common scenarios.
10979 * Rust now works on 64-bit Windows.
10982 * Indexing can be overloaded with the `Index` and `IndexMut`
10984 * The `if let` construct takes a branch only if the `let` pattern
10985 matches, currently behind the 'if_let' feature gate.
10986 * 'where clauses', a more flexible syntax for specifying trait
10987 bounds that is more aesthetic, have been added for traits and
10988 free functions. Where clauses will in the future make it
10989 possible to constrain associated types, which would be
10990 impossible with the existing syntax.
10991 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10992 the 'slicing_syntax' feature gate, and can be overloaded with
10993 the `Slice` or `SliceMut` traits.
10994 * The syntax for matching of sub-slices has been changed to use a
10995 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10996 consistency with other uses of `..` and to future-proof
10997 potential additional uses of the syntax.
10998 * The syntax for matching inclusive ranges in patterns has changed
10999 from `0..3` to `0...4` to be consistent with the exclusive range
11000 syntax for slicing.
11001 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
11002 c]`) has been put behind the 'advanced_slice_patterns' feature
11003 gate and may be removed in the future.
11004 * Components of tuples and tuple structs can be extracted using
11005 the `value.0` syntax, currently behind the `tuple_indexing`
11007 * The `#[crate_id]` attribute is no longer supported; versioning
11008 is handled by the package manager.
11009 * Renaming crate imports are now written `extern crate foo as bar`
11010 instead of `extern crate bar = foo`.
11011 * Renaming use statements are now written `use foo as bar` instead
11012 of `use bar = foo`.
11013 * `let` and `match` bindings and argument names in macros are now
11015 * The new, more efficient, closure types ('unboxed closures') have
11016 been added under a feature gate, 'unboxed_closures'. These will
11017 soon replace the existing closure types, once higher-ranked
11018 trait lifetimes are added to the language.
11019 * `move` has been added as a keyword, for indicating closures
11020 that capture by value.
11021 * Mutation and assignment is no longer allowed in pattern guards.
11022 * Generic structs and enums can now have trait bounds.
11023 * The `Share` trait is now called `Sync` to free up the term
11024 'shared' to refer to 'shared reference' (the default reference
11026 * Dynamically-sized types have been mostly implemented,
11027 unifying the behavior of fat-pointer types with the rest of the
11029 * As part of dynamically-sized types, the `Sized` trait has been
11030 introduced, which qualifying types implement by default, and
11031 which type parameters expect by default. To specify that a type
11032 parameter does not need to be sized, write `<Sized? T>`. Most
11033 types are `Sized`, notable exceptions being unsized arrays
11034 (`[T]`) and trait types.
11035 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
11036 * Lifetime bounds can now be applied to type parameters and object
11038 * The old, reference counted GC type, `Gc<T>` which was once
11039 denoted by the `@` sigil, has finally been removed. GC will be
11040 revisited in the future.
11043 * Library documentation has been improved for a number of modules.
11044 * Bit-vectors, collections::bitv has been modernized.
11045 * The url crate is deprecated in favor of
11046 http://github.com/servo/rust-url, which can be installed with
11048 * Most I/O stream types can be cloned and subsequently closed from
11049 a different thread.
11050 * A `std::time::Duration` type has been added for use in I/O
11051 methods that rely on timers, as well as in the 'time' crate's
11052 `Timespec` arithmetic.
11053 * The runtime I/O abstraction layer that enabled the green thread
11054 scheduler to do non-thread-blocking I/O has been removed, along
11055 with the libuv-based implementation employed by the green thread
11056 scheduler. This will greatly simplify the future I/O work.
11057 * `collections::btree` has been rewritten to have a more
11058 idiomatic and efficient design.
11061 * rustdoc output now indicates the stability levels of API's.
11062 * The `--crate-name` flag can specify the name of the crate
11063 being compiled, like `#[crate_name]`.
11064 * The `-C metadata` specifies additional metadata to hash into
11065 symbol names, and `-C extra-filename` specifies additional
11066 information to put into the output filename, for use by the
11067 package manager for versioning.
11068 * debug info generation has continued to improve and should be
11069 more reliable under both gdb and lldb.
11070 * rustc has experimental support for compiling in parallel
11071 using the `-C codegen-units` flag.
11072 * rustc no longer encodes rpath information into binaries by
11076 * Stack usage has been optimized with LLVM lifetime annotations.
11077 * Official Rust binaries on Linux are more compatible with older
11078 kernels and distributions, built on CentOS 5.10.
11081 Version 0.11.0 (2014-07-02)
11082 ==========================
11084 * ~1700 changes, numerous bugfixes
11087 * ~[T] has been removed from the language. This type is superseded by
11089 * ~str has been removed from the language. This type is superseded by
11091 * ~T has been removed from the language. This type is superseded by the
11093 * @T has been removed from the language. This type is superseded by the
11094 standard library's std::gc::Gc<T> type.
11095 * Struct fields are now all private by default.
11096 * Vector indices and shift amounts are both required to be a `uint`
11097 instead of any integral type.
11098 * Byte character, byte string, and raw byte string literals are now all
11099 supported by prefixing the normal literal with a `b`.
11100 * Multiple ABIs are no longer allowed in an ABI string
11101 * The syntax for lifetimes on closures/procedures has been tweaked
11102 slightly: `<'a>|A, B|: 'b + K -> T`
11103 * Floating point modulus has been removed from the language; however it
11104 is still provided by a library implementation.
11105 * Private enum variants are now disallowed.
11106 * The `priv` keyword has been removed from the language.
11107 * A closure can no longer be invoked through a &-pointer.
11108 * The `use foo, bar, baz;` syntax has been removed from the language.
11109 * The transmute intrinsic no longer works on type parameters.
11110 * Statics now allow blocks/items in their definition.
11111 * Trait bounds are separated from objects with + instead of : now.
11112 * Objects can no longer be read while they are mutably borrowed.
11113 * The address of a static is now marked as insignificant unless the
11114 #[inline(never)] attribute is placed it.
11115 * The #[unsafe_destructor] attribute is now behind a feature gate.
11116 * Struct literals are no longer allowed in ambiguous positions such as
11117 if, while, match, and for..in.
11118 * Declaration of lang items and intrinsics are now feature-gated by
11120 * Integral literals no longer default to `int`, and floating point
11121 literals no longer default to `f64`. Literals must be suffixed with an
11122 appropriate type if inference cannot determine the type of the
11124 * The Box<T> type is no longer implicitly borrowed to &mut T.
11125 * Procedures are now required to not capture borrowed references.
11128 * The standard library is now a "facade" over a number of underlying
11129 libraries. This means that development on the standard library should
11130 be speedier due to smaller crates, as well as a clearer line between
11132 * A new library, libcore, lives under the standard library's facade
11133 which is Rust's "0-assumption" library, suitable for embedded and
11134 kernel development for example.
11135 * A regex crate has been added to the standard distribution. This crate
11136 includes statically compiled regular expressions.
11137 * The unwrap/unwrap_err methods on Result require a Show bound for
11138 better error messages.
11139 * The return types of the std::comm primitives have been centralized
11140 around the Result type.
11141 * A number of I/O primitives have gained the ability to time out their
11143 * A number of I/O primitives have gained the ability to close their
11144 reading/writing halves to cancel pending operations.
11145 * Reverse iterator methods have been removed in favor of `rev()` on
11146 their forward-iteration counterparts.
11147 * A bitflags! macro has been added to enable easy interop with C and
11148 management of bit flags.
11149 * A debug_assert! macro is now provided which is disabled when
11150 `--cfg ndebug` is passed to the compiler.
11151 * A graphviz crate has been added for creating .dot files.
11152 * The std::cast module has been migrated into std::mem.
11153 * The std::local_data api has been migrated from freestanding functions
11154 to being based on methods.
11155 * The Pod trait has been renamed to Copy.
11156 * jemalloc has been added as the default allocator for types.
11157 * The API for allocating memory has been changed to use proper alignment
11158 and sized deallocation
11159 * Connecting a TcpStream or binding a TcpListener is now based on a
11160 string address and a u16 port. This allows connecting to a hostname as
11162 * The Reader trait now contains a core method, read_at_least(), which
11163 correctly handles many repeated 0-length reads.
11164 * The process-spawning API is now centered around a builder-style
11166 * The :? printing qualifier has been moved from the standard library to
11167 an external libdebug crate.
11168 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
11169 have been renamed to Eq/Ord.
11170 * The select/plural methods have been removed from format!. The escapes
11171 for { and } have also changed from \{ and \} to {{ and }},
11173 * The TaskBuilder API has been re-worked to be a true builder, and
11174 extension traits for spawning native/green tasks have been added.
11177 * All breaking changes to the language or libraries now have their
11178 commit message annotated with `[breaking-change]` to allow for easy
11179 discovery of breaking changes.
11180 * The compiler will now try to suggest how to annotate lifetimes if a
11181 lifetime-related error occurs.
11182 * Debug info continues to be improved greatly with general bug fixes and
11183 better support for situations like link time optimization (LTO).
11184 * Usage of syntax extensions when cross-compiling has been fixed.
11185 * Functionality equivalent to GCC & Clang's -ffunction-sections,
11186 -fdata-sections and --gc-sections has been enabled by default
11187 * The compiler is now stricter about where it will load module files
11188 from when a module is declared via `mod foo;`.
11189 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
11190 Syntax extensions are now discovered via a "plugin registrar" type
11191 which will be extended in the future to other various plugins.
11192 * Lints have been restructured to allow for dynamically loadable lints.
11193 * A number of rustdoc improvements:
11194 * The HTML output has been visually redesigned.
11195 * Markdown is now powered by hoedown instead of sundown.
11196 * Searching heuristics have been greatly improved.
11197 * The search index has been reduced in size by a great amount.
11198 * Cross-crate documentation via `pub use` has been greatly improved.
11199 * Primitive types are now hyperlinked and documented.
11200 * Documentation has been moved from static.rust-lang.org/doc to
11202 * A new sandbox, play.rust-lang.org, is available for running and
11203 sharing rust code examples on-line.
11204 * Unused attributes are now more robustly warned about.
11205 * The dead_code lint now warns about unused struct fields.
11206 * Cross-compiling to iOS is now supported.
11207 * Cross-compiling to mipsel is now supported.
11208 * Stability attributes are now inherited by default and no longer apply
11209 to intra-crate usage, only inter-crate usage.
11210 * Error message related to non-exhaustive match expressions have been
11214 Version 0.10 (2014-04-03)
11215 =========================
11217 * ~1500 changes, numerous bugfixes
11220 * A new RFC process is now in place for modifying the language.
11221 * Patterns with `@`-pointers have been removed from the language.
11222 * Patterns with unique vectors (`~[T]`) have been removed from the
11224 * Patterns with unique strings (`~str`) have been removed from the
11226 * `@str` has been removed from the language.
11227 * `@[T]` has been removed from the language.
11228 * `@self` has been removed from the language.
11229 * `@Trait` has been removed from the language.
11230 * Headers on `~` allocations which contain `@` boxes inside the type for
11231 reference counting have been removed.
11232 * The semantics around the lifetimes of temporary expressions have changed,
11233 see #3511 and #11585 for more information.
11234 * Cross-crate syntax extensions are now possible, but feature gated. See
11235 #11151 for more information. This includes both `macro_rules!` macros as
11236 well as syntax extensions such as `format!`.
11237 * New lint modes have been added, and older ones have been turned on to be
11239 * Unnecessary parentheses
11240 * Uppercase statics
11242 * Uppercase variables
11243 * Publicly visible private types
11244 * `#[deriving]` with raw pointers
11245 * Unsafe functions can no longer be coerced to closures.
11246 * Various obscure macros such as `log_syntax!` are now behind feature gates.
11247 * The `#[simd]` attribute is now behind a feature gate.
11248 * Visibility is no longer allowed on `extern crate` statements, and
11249 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
11250 * Trailing commas are now allowed in argument lists and tuple patterns.
11251 * The `do` keyword has been removed, it is now a reserved keyword.
11252 * Default type parameters have been implemented, but are feature gated.
11253 * Borrowed variables through captures in closures are now considered soundly.
11254 * `extern mod` is now `extern crate`
11255 * The `Freeze` trait has been removed.
11256 * The `Share` trait has been added for types that can be shared among
11258 * Labels in macros are now hygienic.
11259 * Expression/statement macro invocations can be delimited with `{}` now.
11260 * Treatment of types allowed in `static mut` locations has been tweaked.
11261 * The `*` and `.` operators are now overloadable through the `Deref` and
11263 * `~Trait` and `proc` no longer have `Send` bounds by default.
11264 * Partial type hints are now supported with the `_` type marker.
11265 * An `Unsafe` type was introduced for interior mutability. It is now
11266 considered undefined to transmute from `&T` to `&mut T` without using the
11268 * The #[linkage] attribute was implemented for extern statics/functions.
11269 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
11270 * `Pod` was renamed to `Copy`.
11273 * The `libextra` library has been removed. It has now been decomposed into
11274 component libraries with smaller and more focused nuggets of
11275 functionality. The full list of libraries can be found on the
11276 documentation index page.
11277 * std: `std::condition` has been removed. All I/O errors are now propagated
11278 through the `Result` type. In order to assist with error handling, a
11279 `try!` macro for unwrapping errors with an early return and a lint for
11280 unused results has been added. See #12039 for more information.
11281 * std: The `vec` module has been renamed to `slice`.
11282 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
11283 This will become the only growable vector in the future.
11284 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
11285 are now found at `std::io::BufferedReader` instead of
11286 `std::io::buffered::BufferedReader`.
11287 * std: `print` and `println` are no longer in the prelude, the `print!` and
11288 `println!` macros are intended to be used instead.
11289 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
11290 attempts to statically prevent cycles.
11291 * std: The standard distribution is adopting the policy of pushing failure
11292 to the user rather than failing in libraries. Many functions (such as
11293 `slice::last()`) now return `Option<T>` instead of `T` + failing.
11294 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
11295 deriving mode: `#[deriving(Show)]`.
11296 * std: `ToStr` is now implemented for all types implementing `Show`.
11297 * std: The formatting trait methods now take `&self` instead of `&T`
11298 * std: The `invert()` method on iterators has been renamed to `rev()`
11299 * std: `std::num` has seen a reduction in the genericity of its traits,
11300 consolidating functionality into a few core traits.
11301 * std: Backtraces are now printed on task failure if the environment
11302 variable `RUST_BACKTRACE` is present.
11303 * std: Naming conventions for iterators have been standardized. More details
11304 can be found on the wiki's style guide.
11305 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11306 still implement the function.
11307 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11308 * std: `assert_approx_eq!` has been removed
11309 * std: The `e` and `E` formatting specifiers for floats have been added to
11310 print them in exponential notation.
11311 * std: The `Times` trait has been removed
11312 * std: Indications of variance and opting out of builtin bounds is done
11313 through marker types in `std::kinds::marker` now
11314 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11315 `#[deriving(Hash)]` is now possible.
11316 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11317 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11318 * std: `Chan::new` is now `channel()`.
11319 * std: A new synchronous channel type has been implemented.
11320 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11321 * std: `hashmap` and `trie` have been moved to `libcollections`
11322 * std: `run` has been rolled into `io::process`
11323 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11324 * std: The equality and comparison traits have seen some reorganization.
11325 * std: `rand` has moved to `librand`.
11326 * std: `to_{lower,upper}case` has been implemented for `char`.
11327 * std: Logging has been moved to `liblog`.
11328 * collections: `HashMap` has been rewritten for higher performance and less
11330 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11331 it can be booted manually. The runtime guide has more information and
11333 * native: All I/O functionality except signals has been implemented.
11334 * green: Task spawning with `libgreen` has been optimized with stack caching
11335 and various trimming of code.
11336 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11337 * sync: The `extra::sync` module has been updated to modern rust (and moved
11338 to the `sync` library), tweaking and improving various interfaces while
11339 dropping redundant functionality.
11340 * sync: A new `Barrier` type has been added to the `sync` library.
11341 * sync: An efficient mutex for native and green tasks has been implemented.
11342 * serialize: The `base64` module has seen some improvement. It treats
11343 newlines better, has non-string error values, and has seen general
11345 * fourcc: A `fourcc!` macro was introduced
11346 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11347 hexadecimal literal.
11350 * `rustpkg` has been deprecated and removed from the main repository. Its
11351 replacement, `cargo`, is under development.
11352 * Nightly builds of rust are now available
11353 * The memory usage of rustc has been improved many times throughout this
11355 * The build process supports disabling rpath support for the rustc binary
11357 * Code generation has improved in some cases, giving more information to the
11358 LLVM optimization passes to enable more extensive optimizations.
11359 * Debuginfo compatibility with lldb on OSX has been restored.
11360 * The master branch is now gated on an android bot, making building for
11361 android much more reliable.
11362 * Output flags have been centralized into one `--emit` flag.
11363 * Crate type flags have been centralized into one `--crate-type` flag.
11364 * Codegen flags have been consolidated behind a `-C` flag.
11365 * Linking against outdated crates now has improved error messages.
11366 * Error messages with lifetimes will often suggest how to annotate the
11367 function to fix the error.
11368 * Many more types are documented in the standard library, and new guides
11370 * Many `rustdoc` improvements:
11371 * code blocks are syntax highlighted.
11372 * render standalone markdown files.
11373 * the --test flag tests all code blocks by default.
11374 * exported macros are displayed.
11375 * re-exported types have their documentation inlined at the location of the
11377 * search works across crates that have been rendered to the same output
11381 Version 0.9 (2014-01-09)
11382 ==========================
11384 * ~1800 changes, numerous bugfixes
11387 * The `float` type has been removed. Use `f32` or `f64` instead.
11388 * A new facility for enabling experimental features (feature gating) has
11389 been added, using the crate-level `#[feature(foo)]` attribute.
11390 * Managed boxes (@) are now behind a feature gate
11391 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11392 standard library's `Gc` or `Rc` types instead.
11393 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11394 * Jumping back to the top of a loop is now done with `continue` instead of
11396 * Strings can no longer be mutated through index assignment.
11397 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11398 hash delimiters, as in `r###"foo"###`.
11399 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11401 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11402 * `@fn`s have been removed.
11403 * `do` only works with procs in order to make it obvious what the cost
11405 * Single-element tuple-like structs can no longer be dereferenced to
11406 obtain the inner value. A more comprehensive solution for overloading
11407 the dereference operator will be provided in the future.
11408 * The `#[link(...)]` attribute has been replaced with
11409 `#[crate_id = "name#vers"]`.
11410 * Empty `impl`s must be terminated with empty braces and may not be
11411 terminated with a semicolon.
11412 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11413 no longer has any special meaning.
11414 * The old `fmt!` string formatting macro has been removed.
11415 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11416 `print!` and `println!`.
11417 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11418 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11419 `extern mod foo = "bar"` instead.
11420 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11421 * Macros can have attributes.
11422 * Macros can expand to items with attributes.
11423 * Macros can expand to multiple items.
11424 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11425 * Comments may be nested.
11426 * Values automatically coerce to trait objects they implement, without
11428 * Enum discriminants are no longer an entire word but as small as needed to
11429 contain all the variants. The `repr` attribute can be used to override
11430 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11431 `#[repr(C)]` to match C enums.
11432 * Non-string literals are not allowed in attributes (they never worked).
11433 * The FFI now supports variadic functions.
11434 * Octal numeric literals, as in `0o7777`.
11435 * The `concat!` syntax extension performs compile-time string concatenation.
11436 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11437 removed as Rust no longer uses segmented stacks.
11438 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11439 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11440 not `*`; ignoring remaining fields of a struct is also done with `..`,
11441 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11442 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11443 * `rustc` supports the "system" calling convention, which defaults to the
11444 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11446 * The `type_overflow` lint (default: warn) checks literals for overflow.
11447 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11448 * The `attribute_usage` lint (default: warn) warns about unknown
11450 * The `unknown_features` lint (default: warn) warns about unknown
11452 * The `dead_code` lint (default: warn) checks for dead code.
11453 * Rust libraries can be linked statically to one another
11454 * `#[link_args]` is behind the `link_args` feature gate.
11455 * Native libraries are now linked with `#[link(name = "foo")]`
11456 * Native libraries can be statically linked to a rust crate
11457 (`#[link(name = "foo", kind = "static")]`).
11458 * Native OS X frameworks are now officially supported
11459 (`#[link(name = "foo", kind = "framework")]`).
11460 * The `#[thread_local]` attribute creates thread-local (not task-local)
11461 variables. Currently behind the `thread_local` feature gate.
11462 * The `return` keyword may be used in closures.
11463 * Types that can be copied via a memcpy implement the `Pod` kind.
11464 * The `cfg` attribute can now be used on struct fields and enum variants.
11467 * std: The `option` and `result` API's have been overhauled to make them
11468 simpler, more consistent, and more composable.
11469 * std: The entire `std::io` module has been replaced with one that is
11470 more comprehensive and that properly interfaces with the underlying
11471 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11473 * std: `io::util` contains a number of useful implementations of
11474 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11475 `ZeroReader`, `TeeReader`.
11476 * std: The reference counted pointer type `extra::rc` moved into std.
11477 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11478 just a wrapper around it).
11479 * std: The `Either` type has been removed.
11480 * std: `fmt::Default` can be implemented for any type to provide default
11481 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11482 * std: The `rand` API continues to be tweaked.
11483 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11484 on failure in gdb, is now named `rust_fail`.
11485 * std: The `each_key` and `each_value` methods on `HashMap` have been
11486 replaced by the `keys` and `values` iterators.
11487 * std: Functions dealing with type size and alignment have moved from the
11488 `sys` module to the `mem` module.
11489 * std: The `path` module was written and API changed.
11490 * std: `str::from_utf8` has been changed to cast instead of allocate.
11491 * std: `starts_with` and `ends_with` methods added to vectors via the
11492 `ImmutableEqVector` trait, which is in the prelude.
11493 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11494 if the index is out of bounds.
11495 * std: Task failure no longer propagates between tasks, as the model was
11496 complex, expensive, and incompatible with thread-based tasks.
11497 * std: The `Any` type can be used for dynamic typing.
11498 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11500 * std: Methods that produce iterators generally do not have an `_iter`
11502 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11503 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11504 * std: `util::ignore` renamed to `prelude::drop`.
11505 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11507 * std: `vec::raw` has seen a lot of cleanup and API changes.
11508 * std: The standard library no longer includes any C++ code, and very
11509 minimal C, eliminating the dependency on libstdc++.
11510 * std: Runtime scheduling and I/O functionality has been factored out into
11511 extensible interfaces and is now implemented by two different crates:
11512 libnative, for native threading and I/O; and libgreen, for green threading
11513 and I/O. This paves the way for using the standard library in more limited
11514 embedded environments.
11515 * std: The `comm` module has been rewritten to be much faster, have a
11516 simpler, more consistent API, and to work for both native and green
11518 * std: All libuv dependencies have been moved into the rustuv crate.
11519 * native: New implementations of runtime scheduling on top of OS threads.
11520 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11522 * green: The green thread scheduler and message passing types are almost
11523 entirely lock-free.
11524 * extra: The `flatpipes` module had bitrotted and was removed.
11525 * extra: All crypto functions have been removed and Rust now has a policy of
11526 not reimplementing crypto in the standard library. In the future crypto
11527 will be provided by external crates with bindings to established libraries.
11528 * extra: `c_vec` has been modernized.
11529 * extra: The `sort` module has been removed. Use the `sort` method on
11533 * The `rust` and `rusti` commands have been removed, due to lack of
11535 * `rustdoc` was completely rewritten.
11536 * `rustdoc` can test code examples in documentation.
11537 * `rustpkg` can test packages with the argument, 'test'.
11538 * `rustpkg` supports arbitrary dependencies, including C libraries.
11539 * `rustc`'s support for generating debug info is improved again.
11540 * `rustc` has better error reporting for unbalanced delimiters.
11541 * `rustc`'s JIT support was removed due to bitrot.
11542 * Executables and static libraries can be built with LTO (-Z lto)
11543 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11547 Version 0.8 (2013-09-26)
11548 ============================
11550 * ~2200 changes, numerous bugfixes
11553 * The `for` loop syntax has changed to work with the `Iterator` trait.
11554 * At long last, unwinding works on Windows.
11555 * Default methods are ready for use.
11556 * Many trait inheritance bugs fixed.
11557 * Owned and borrowed trait objects work more reliably.
11558 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11559 * rustc can omit emission of code for the `debug!` macro if it is passed
11561 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11562 for foo.rs, then foo/mod.rs, and will generate an error when both are
11564 * Strings no longer contain trailing nulls. The new `std::c_str` module
11565 provides new mechanisms for converting to C strings.
11566 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11567 * The FFI has been overhauled such that foreign functions are called directly,
11568 instead of through a stack-switching wrapper.
11569 * Calling a foreign function must be done through a Rust function with the
11570 `#[fixed_stack_segment]` attribute.
11571 * The `externfn!` macro can be used to declare both a foreign function and
11572 a `#[fixed_stack_segment]` wrapper at once.
11573 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11574 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11575 * `priv` is disallowed everywhere except for struct fields and enum variants.
11576 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11577 * `ref` bindings in irrefutable patterns work correctly now.
11578 * `char` is now prevented from containing invalid code points.
11579 * Casting to `bool` is no longer allowed.
11580 * `\0` is now accepted as an escape in chars and strings.
11581 * `yield` is a reserved keyword.
11582 * `typeof` is a reserved keyword.
11583 * Crates may be imported by URL with `extern mod foo = "url";`.
11584 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11585 * Static vectors can be initialized with repeating elements,
11586 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11587 * Static structs can be initialized with functional record update,
11588 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11589 * `cfg!` can be used to conditionally execute code based on the crate
11590 configuration, similarly to `#[cfg(...)]`.
11591 * The `unnecessary_qualification` lint detects unneeded module
11592 prefixes (default: allow).
11593 * Arithmetic operations have been implemented on the SIMD types in
11594 `std::unstable::simd`.
11595 * Exchange allocation headers were removed, reducing memory usage.
11596 * `format!` implements a completely new, extensible, and higher-performance
11597 string formatting system. It will replace `fmt!`.
11598 * `print!` and `println!` write formatted strings (using the `format!`
11599 extension) to stdout.
11600 * `write!` and `writeln!` write formatted strings (using the `format!`
11601 extension) to the new Writers in `std::rt::io`.
11602 * The library section in which a function or static is placed may
11603 be specified with `#[link_section = "..."]`.
11604 * The `proto!` syntax extension for defining bounded message protocols
11606 * `macro_rules!` is hygienic for `let` declarations.
11607 * The `#[export_name]` attribute specifies the name of a symbol.
11608 * `unreachable!` can be used to indicate unreachable code, and fails
11612 * std: Transitioned to the new runtime, written in Rust.
11613 * std: Added an experimental I/O library, `rt::io`, based on the new
11615 * std: A new generic `range` function was added to the prelude, replacing
11616 `uint::range` and friends.
11617 * std: `range_rev` no longer exists. Since range is an iterator it can be
11618 reversed with `range(lo, hi).invert()`.
11619 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11620 renamed to `unwrap_or`.
11621 * std: The `iterator` module was renamed to `iter`.
11622 * std: Integral types now support the `checked_add`, `checked_sub`, and
11623 `checked_mul` operations for detecting overflow.
11624 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11626 * std: Methods are standardizing on conventions for casting methods:
11627 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11629 * std: The `CString` type in `c_str` provides new ways to convert to and
11631 * std: `DoubleEndedIterator` can yield elements in two directions.
11632 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11634 * std: `str::from_bytes` renamed to `str::from_utf8`.
11635 * std: `pop_opt` and `shift_opt` methods added to vectors.
11636 * std: The task-local data interface no longer uses @, and keys are
11637 no longer function pointers.
11638 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11639 * std: Added `SharedPort` to `comm`.
11640 * std: `Eq` has a default method for `ne`; only `eq` is required
11641 in implementations.
11642 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11643 is required in implementations.
11644 * std: `is_utf8` performance is improved, impacting many string functions.
11645 * std: `os::MemoryMap` provides cross-platform mmap.
11646 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11647 are not 'in-bounds' are considered undefined.
11648 * std: Many freestanding functions in `vec` removed in favor of methods.
11649 * std: Many freestanding functions on scalar types removed in favor of
11651 * std: Many options to task builders were removed since they don't make
11652 sense in the new scheduler design.
11653 * std: More containers implement `FromIterator` so can be created by the
11655 * std: More complete atomic types in `unstable::atomics`.
11656 * std: `comm::PortSet` removed.
11657 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11658 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11659 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11660 default implementations.
11661 * std: Various `from_str` functions were removed in favor of a generic
11662 `from_str` which is available in the prelude.
11663 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11664 * extra: `dlist`, the doubly-linked list was modernized.
11665 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11666 * extra: Added `glob` module, replacing `std::os::glob`.
11667 * extra: `rope` was removed.
11668 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11669 * extra: `net`, and `timer` were removed. The experimental replacements
11670 are `std::rt::io::net` and `std::rt::io::timer`.
11671 * extra: Iterators implemented for `SmallIntMap`.
11672 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11673 * extra: `SmallIntSet` removed. Use `BitvSet`.
11674 * extra: Performance of JSON parsing greatly improved.
11675 * extra: `semver` updated to SemVer 2.0.0.
11676 * extra: `term` handles more terminals correctly.
11677 * extra: `dbg` module removed.
11678 * extra: `par` module removed.
11679 * extra: `future` was cleaned up, with some method renames.
11680 * extra: Most free functions in `getopts` were converted to methods.
11683 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11684 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11685 similarly to gcc's `--march` flag.
11686 * rustc's performance compiling small crates is much better.
11687 * rustpkg has received many improvements.
11688 * rustpkg supports git tags as package IDs.
11689 * rustpkg builds into target-specific directories so it can be used for
11691 * The number of concurrent test tasks is controlled by the environment
11692 variable RUST_TEST_TASKS.
11693 * The test harness can now report metrics for benchmarks.
11694 * All tools have man pages.
11695 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11696 * The runtime uses jemalloc for allocations.
11697 * Segmented stacks are temporarily disabled as part of the transition to
11698 the new runtime. Stack overflows are possible!
11699 * A new documentation backend, rustdoc_ng, is available for use. It is
11700 still invoked through the normal `rustdoc` command.
11703 Version 0.7 (2013-07-03)
11704 =======================
11706 * ~2000 changes, numerous bugfixes
11709 * `impl`s no longer accept a visibility qualifier. Put them on methods
11711 * The borrow checker has been rewritten with flow-sensitivity, fixing
11712 many bugs and inconveniences.
11713 * The `self` parameter no longer implicitly means `&'self self`,
11714 and can be explicitly marked with a lifetime.
11715 * Overloadable compound operators (`+=`, etc.) have been temporarily
11716 removed due to bugs.
11717 * The `for` loop protocol now requires `for`-iterators to return `bool`
11718 so they compose better.
11719 * The `Durable` trait is replaced with the `'static` bounds.
11720 * Trait default methods work more often.
11721 * Structs with the `#[packed]` attribute have byte alignment and
11722 no padding between fields.
11723 * Type parameters bound by `Copy` must now be copied explicitly with
11724 the `copy` keyword.
11725 * It is now illegal to move out of a dereferenced unsafe pointer.
11726 * `Option<~T>` is now represented as a nullable pointer.
11727 * `@mut` does dynamic borrow checks correctly.
11728 * The `main` function is only detected at the topmost level of the crate.
11729 The `#[main]` attribute is still valid anywhere.
11730 * Struct fields may no longer be mutable. Use inherited mutability.
11731 * The `#[no_send]` attribute makes a type that would otherwise be
11733 * The `#[no_freeze]` attribute makes a type that would otherwise be
11735 * Unbounded recursion will abort the process after reaching the limit
11736 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11737 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11738 are never implicitly copyable.
11739 * `#[static_assert]` makes compile-time assertions about static bools.
11740 * At long last, 'argument modes' no longer exist.
11741 * The rarely used `use mod` statement no longer exists.
11743 * Syntax extensions
11744 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11746 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11747 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11748 `#[deriving(...)]`.
11749 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11750 and unsuffixed integer literals.
11753 * The `core` crate was renamed to `std`.
11754 * The `std` crate was renamed to `extra`.
11755 * More and improved documentation.
11756 * std: `iterator` module for external iterator objects.
11757 * Many old-style (internal, higher-order function) iterators replaced by
11758 implementations of `Iterator`.
11759 * std: Many old internal vector and string iterators,
11760 incl. `any`, `all`. removed.
11761 * std: The `finalize` method of `Drop` renamed to `drop`.
11762 * std: The `drop` method now takes `&mut self` instead of `&self`.
11763 * std: The prelude no longer re-exports any modules, only types and traits.
11764 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11765 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11766 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11767 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11768 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11769 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11770 * std: Many types implement `Clone`.
11771 * std: `path` type renamed to `Path`.
11772 * std: `mut` module and `Mut` type removed.
11773 * std: Many standalone functions removed in favor of methods and iterators
11774 in `vec`, `str`. In the future methods will also work as functions.
11775 * std: `reinterpret_cast` removed. Use `transmute`.
11776 * std: ascii string handling in `std::ascii`.
11777 * std: `Rand` is implemented for ~/@.
11778 * std: `run` module for spawning processes overhauled.
11779 * std: Various atomic types added to `unstable::atomic`.
11780 * std: Various types implement `Zero`.
11781 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11782 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11783 * std: Added `os::mkdir_recursive`.
11784 * std: Added `os::glob` function performs filesystems globs.
11785 * std: `FuzzyEq` renamed to `ApproxEq`.
11786 * std: `Map` now defines `pop` and `swap` methods.
11787 * std: `Cell` constructors converted to static methods.
11788 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11789 * extra: `flate` module moved from `std` to `extra`.
11790 * extra: `fileinput` module for iterating over a series of files.
11791 * extra: `Complex` number type and `complex` module.
11792 * extra: `Rational` number type and `rational` module.
11793 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11794 * extra: `term` uses terminfo now, is more correct.
11795 * extra: `arc` functions converted to methods.
11796 * extra: Implementation of fixed output size variations of SHA-2.
11799 * `unused_variables` lint mode for unused variables (default: warn).
11800 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11802 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11804 * `dead_assignment` lint mode for unread variables (default: warn).
11805 * `unnecessary_allocation` lint mode detects some heap allocations that are
11806 immediately borrowed so could be written without allocating (default: warn).
11807 * `missing_doc` lint mode (default: allow).
11808 * `unreachable_code` lint mode (default: warn).
11809 * The `rusti` command has been rewritten and a number of bugs addressed.
11810 * rustc outputs in color on more terminals.
11811 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11812 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11813 * Compiling with `-g` will make the binary record information about
11814 dynamic borrowcheck failures for debugging.
11815 * rustdoc has a nicer stylesheet.
11816 * Various improvements to rustdoc.
11817 * Improvements to rustpkg (see the detailed release notes).
11820 Version 0.6 (2013-04-03)
11821 ========================
11823 * ~2100 changes, numerous bugfixes
11826 * The self type parameter in traits is now spelled `Self`
11827 * The `self` parameter in trait and impl methods must now be explicitly
11828 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11829 * Static methods no longer require the `static` keyword and instead
11830 are distinguished by the lack of a `self` parameter
11831 * Replaced the `Durable` trait with the `'static` lifetime
11832 * The old closure type syntax with the trailing sigil has been
11833 removed in favor of the more consistent leading sigil
11834 * `super` is a keyword, and may be prefixed to paths
11835 * Trait bounds are separated with `+` instead of whitespace
11836 * Traits are implemented with `impl Trait for Type`
11837 instead of `impl Type: Trait`
11838 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11839 * The `export` keyword has finally been removed
11840 * The `move` keyword has been removed (see "Semantic changes")
11841 * The interior mutability qualifier on vectors, `[mut T]`, has been
11842 removed. Use `&mut [T]`, etc.
11843 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11844 * `fail` is no longer a keyword. Use `fail!()`
11845 * `assert` is no longer a keyword. Use `assert!()`
11846 * `log` is no longer a keyword. use `debug!`, etc.
11847 * 1-tuples may be represented as `(T,)`
11848 * Struct fields may no longer be `mut`. Use inherited mutability,
11849 `@mut T`, `core::mut` or `core::cell`
11850 * `extern mod { ... }` is no longer valid syntax for foreign
11851 function modules. Use extern blocks: `extern { ... }`
11852 * Newtype enums removed. Use tuple-structs.
11853 * Trait implementations no longer support visibility modifiers
11854 * Pattern matching over vectors improved and expanded
11855 * `const` renamed to `static` to correspond to lifetime name,
11856 and make room for future `static mut` unsafe mutable globals.
11857 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11858 * `Clone` implementations can be automatically generated with
11859 `#[deriving(Clone)]`
11860 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11861 instead of `foo as Bar`.
11862 * Fixed length vector types are now written as `[int, .. 3]`
11863 instead of `[int * 3]`.
11864 * Fixed length vector types can express the length as a constant
11865 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11868 * Types with owned pointers or custom destructors move by default,
11869 eliminating the `move` keyword
11870 * All foreign functions are considered unsafe
11871 * &mut is now unaliasable
11872 * Writes to borrowed @mut pointers are prevented dynamically
11874 * The name of the main function can be customized using #[main]
11875 * The default type of an inferred closure is &fn instead of @fn
11876 * `use` statements may no longer be "chained" - they cannot import
11877 identifiers imported by previous `use` statements
11878 * `use` statements are crate relative, importing from the "top"
11879 of the crate by default. Paths may be prefixed with `super::`
11880 or `self::` to change the search behavior.
11881 * Method visibility is inherited from the implementation declaration
11882 * Structural records have been removed
11883 * Many more types can be used in static items, including enums
11884 'static-lifetime pointers and vectors
11885 * Pattern matching over vectors improved and expanded
11886 * Typechecking of closure types has been overhauled to
11887 improve inference and eliminate unsoundness
11888 * Macros leave scope at the end of modules, unless that module is
11889 tagged with #[macro_escape]
11892 * Added big integers to `std::bigint`
11893 * Removed `core::oldcomm` module
11894 * Added pipe-based `core::comm` module
11895 * Numeric traits have been reorganized under `core::num`
11896 * `vec::slice` finally returns a slice
11897 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11898 * Containers reorganized around traits in `core::container`
11899 * `core::dvec` removed, `~[T]` is a drop-in replacement
11900 * `core::send_map` renamed to `core::hashmap`
11901 * `std::map` removed; replaced with `core::hashmap`
11902 * `std::treemap` reimplemented as an owned balanced tree
11903 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11904 * `core::trie` added as a fast ordered map for integer keys
11905 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11906 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11907 overload the comparison operators, whereas `TotalOrd` is used
11908 by certain container types
11911 * Replaced the 'cargo' package manager with 'rustpkg'
11912 * Added all-purpose 'rust' tool
11913 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11914 * rustc now *attempts* to offer spelling suggestions
11915 * Improved support for ARM and Android
11916 * Preliminary MIPS backend
11917 * Improved foreign function ABI implementation for x86, x86_64
11918 * Various memory usage improvements
11919 * Rust code may be embedded in foreign code under limited circumstances
11920 * Inline assembler supported by new asm!() syntax extension.
11923 Version 0.5 (2012-12-21)
11924 ===========================
11926 * ~900 changes, numerous bugfixes
11929 * Removed `<-` move operator
11930 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11931 * Removed old fixed length vector syntax - `[T]/N`
11932 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11933 * Macros may now expand to items and statements
11934 * `a.b()` is always parsed as a method call, never as a field projection
11935 * `Eq` and `IterBytes` implementations can be automatically generated
11936 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11937 * Removed the special crate language for `.rc` files
11938 * Function arguments may consist of any irrefutable pattern
11941 * `&` and `~` pointers may point to objects
11942 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11943 * Enum variants may be structs
11944 * Destructors can be added to all nominal types with the Drop trait
11945 * Structs and nullary enum variants may be constants
11946 * Values that cannot be implicitly copied are now automatically moved
11947 without writing `move` explicitly
11948 * `&T` may now be coerced to `*T`
11949 * Coercions happen in `let` statements as well as function calls
11950 * `use` statements now take crate-relative paths
11951 * The module and type namespaces have been merged so that static
11952 method names can be resolved under the trait in which they are
11955 * Improved support for language features
11956 * Trait inheritance works in many scenarios
11957 * More support for explicit self arguments in methods - `self`, `&self`
11958 `@self`, and `~self` all generally work as expected
11959 * Static methods work in more situations
11960 * Experimental: Traits may declare default methods for the implementations
11964 * New condition handling system in `core::condition`
11965 * Timsort added to `std::sort`
11966 * New priority queue, `std::priority_queue`
11967 * Pipes for serializable types, `std::flatpipes'
11968 * Serialization overhauled to be trait-based
11969 * Expanded `getopts` definitions
11970 * Moved futures to `std`
11971 * More functions are pure now
11972 * `core::comm` renamed to `oldcomm`. Still deprecated
11973 * `rustdoc` and `cargo` are libraries now
11976 * Added a preliminary REPL, `rusti`
11977 * License changed from MIT to dual MIT/APL2
11980 Version 0.4 (2012-10-15)
11981 ==========================
11983 * ~2000 changes, numerous bugfixes
11986 * All keywords are now strict and may not be used as identifiers anywhere
11987 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11988 'of', 'with', 'to', 'class'.
11989 * Classes are replaced with simpler structs
11990 * Explicit method self types
11991 * `ret` became `return` and `alt` became `match`
11992 * `import` is now `use`; `use is now `extern mod`
11993 * `extern mod { ... }` is now `extern { ... }`
11994 * `use mod` is the recommended way to import modules
11995 * `pub` and `priv` replace deprecated export lists
11996 * The syntax of `match` pattern arms now uses fat arrow (=>)
11997 * `main` no longer accepts an args vector; use `os::args` instead
12000 * Trait implementations are now coherent, ala Haskell typeclasses
12001 * Trait methods may be static
12002 * Argument modes are deprecated
12003 * Borrowed pointers are much more mature and recommended for use
12004 * Strings and vectors in the static region are stored in constant memory
12005 * Typestate was removed
12006 * Resolution rewritten to be more reliable
12007 * Support for 'dual-mode' data structures (freezing and thawing)
12010 * Most binary operators can now be overloaded via the traits in
12012 * `std::net::url` for representing URLs
12013 * Sendable hash maps in `core::send_map`
12014 * `core::task' gained a (currently unsafe) task-local storage API
12017 * An efficient new intertask communication primitive called the pipe,
12018 along with a number of higher-level channel types, in `core::pipes`
12019 * `std::arc`, an atomically reference counted, immutable, shared memory
12021 * `std::sync`, various exotic synchronization tools based on arcs and pipes
12022 * Futures are now based on pipes and sendable
12023 * More robust linked task failure
12024 * Improved task builder API
12027 * Improved error reporting
12028 * Preliminary JIT support
12029 * Preliminary work on precise GC
12030 * Extensive architectural improvements to rustc
12031 * Begun a transition away from buggy C++-based reflection (shape) code to
12032 Rust-based (visitor) code
12033 * All hash functions and tables converted to secure, randomized SipHash
12036 Version 0.3 (2012-07-12)
12037 ========================
12039 * ~1900 changes, numerous bugfixes
12041 * New coding conveniences
12042 * Integer-literal suffix inference
12043 * Per-item control over warnings, errors
12044 * #[cfg(windows)] and #[cfg(unix)] attributes
12045 * Documentation comments
12046 * More compact closure syntax
12047 * 'do' expressions for treating higher-order functions as
12049 * *-patterns (wildcard extended to all constructor fields)
12052 * Name resolution pass and exhaustiveness checker rewritten
12053 * Region pointers and borrow checking supersede alias
12055 * Init-ness checking is now provided by a region-based liveness
12056 pass instead of the typestate pass; same for last-use analysis
12057 * Extensive work on region pointers
12059 * Experimental new language features
12060 * Slices and fixed-size, interior-allocated vectors
12061 * #!-comments for lang versioning, shell execution
12062 * Destructors and iface implementation for classes;
12063 type-parameterized classes and class methods
12064 * 'const' type kind for types that can be used to implement
12065 shared-memory concurrency patterns
12069 * Removal of various obsolete features
12070 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
12071 'crust', 'native' (now 'extern'), 'cont' (now 'again')
12073 * Constructs: do-while loops ('do' repurposed), fn binding,
12074 resources (replaced by destructors)
12076 * Compiler reorganization
12077 * Syntax-layer of compiler split into separate crate
12078 * Clang (from LLVM project) integrated into build
12079 * Typechecker split into sub-modules
12082 * New time functions
12083 * Extension methods for many built-in types
12084 * Arc: atomic-refcount read-only / exclusive-use shared cells
12085 * Par: parallel map and search routines
12086 * Extensive work on libuv interface
12087 * Much vector code moved to libraries
12088 * Syntax extensions: #line, #col, #file, #mod, #stringify,
12089 #include, #include_str, #include_bin
12091 * Tool improvements
12092 * Cargo automatically resolves dependencies
12095 Version 0.2 (2012-03-29)
12096 =========================
12098 * >1500 changes, numerous bugfixes
12100 * New docs and doc tooling
12102 * New port: FreeBSD x86_64
12104 * Compilation model enhancements
12105 * Generics now specialized, multiply instantiated
12106 * Functions now inlined across separate crates
12108 * Scheduling, stack and threading fixes
12109 * Noticeably improved message-passing performance
12110 * Explicit schedulers
12114 * Experimental new language features
12115 * Operator overloading
12119 * Various language extensions
12120 * C-callback function types: 'crust fn ...'
12121 * Infinite-loop construct: 'loop { ... }'
12122 * Shorten 'mutable' to 'mut'
12123 * Required mutable-local qualifier: 'let mut ...'
12124 * Basic glob-exporting: 'export foo::*;'
12125 * Alt now exhaustive, 'alt check' for runtime-checked
12126 * Block-function form of 'for' loop, with 'break' and 'ret'.
12129 * AST quasi-quote syntax extension
12130 * Revived libuv interface
12131 * New modules: core::{future, iter}, std::arena
12132 * Merged per-platform std::{os*, fs*} to core::{libc, os}
12133 * Extensive cleanup, regularization in libstd, libcore
12136 Version 0.1 (2012-01-20)
12137 ===============================
12139 * Most language features work, including:
12140 * Unique pointers, unique closures, move semantics
12141 * Interface-constrained generics
12142 * Static interface dispatch
12144 * Multithread task scheduling
12145 * Typestate predicates
12146 * Failure unwinding, destructors
12147 * Pattern matching and destructuring assignment
12148 * Lightweight block-lambda syntax
12149 * Preliminary macro-by-example
12151 * Compiler works with the following configurations:
12152 * Linux: x86 and x86_64 hosts and targets
12153 * macOS: x86 and x86_64 hosts and targets
12154 * Windows: x86 hosts and targets
12156 * Cross compilation / multi-target configuration supported.
12158 * Preliminary API-documentation and package-management tools included.
12162 * Documentation is incomplete.
12164 * Performance is below intended target.
12166 * Standard library APIs are subject to extensive change, reorganization.
12168 * Language-level versioning is not yet operational - future code will
12169 break unexpectedly.