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 - [0.5 now rounds to 0 when formatted to 0 decimal places.](https://github.com/rust-lang/rust/pull/102935/)
75 This makes it consistent with the rest of floating point formatting that
76 rounds ties toward even digits.
77 - [Chains of `&&` and `||` will now drop temporaries from their sub-expressions in
78 evaluation order, left-to-right.](https://github.com/rust-lang/rust/pull/103293/)
79 Previously, it was "twisted" such that the _first_ expression dropped its
80 temporaries _last_, after all of the other expressions dropped in order.
81 - [Underscore suffixes on string literals are now a hard error.](https://github.com/rust-lang/rust/pull/103914/)
82 This has been a future-compatibility warning since 1.20.0.
83 - [Stop passing `-export-dynamic` to `wasm-ld`.](https://github.com/rust-lang/rust/pull/105405/)
84 - [`main` is now mangled as `__main_void` on `wasm32-wasi`.](https://github.com/rust-lang/rust/pull/105468/)
85 - [Cargo now emits an error if there are multiple registries in the configuration
86 with the same index URL.](https://github.com/rust-lang/cargo/pull/10592)
88 <a id="1.67.0-Internal-Changes"></a>
93 These changes do not affect any public interfaces of Rust, but they represent
94 significant improvements to the performance or internals of rustc and related
97 - [Rewrite LLVM's archive writer in Rust.](https://github.com/rust-lang/rust/pull/97485/)
99 Version 1.66.1 (2023-01-10)
100 ===========================
102 - Added validation of SSH host keys for git URLs in Cargo ([CVE-2022-46176](https://www.cve.org/CVERecord?id=CVE-2022-46176))
104 Version 1.66.0 (2022-12-15)
105 ==========================
109 - [Permit specifying explicit discriminants on all `repr(Int)` enums](https://github.com/rust-lang/rust/pull/95710/)
118 - [Allow transmutes between the same type differing only in lifetimes](https://github.com/rust-lang/rust/pull/101520/)
119 - [Change constant evaluation errors from a deny-by-default lint to a hard error](https://github.com/rust-lang/rust/pull/102091/)
120 - [Trigger `must_use` on `impl Trait` for supertraits](https://github.com/rust-lang/rust/pull/102287/)
121 This makes `impl ExactSizeIterator` respect the existing `#[must_use]` annotation on `Iterator`.
122 - [Allow `..=X` in patterns](https://github.com/rust-lang/rust/pull/102275/)
123 - [Uplift `clippy::for_loops_over_fallibles` lint into rustc](https://github.com/rust-lang/rust/pull/99696/)
124 - [Stabilize `sym` operands in inline assembly](https://github.com/rust-lang/rust/pull/103168/)
125 - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101912/)
126 - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
127 This is a soundness fix which may break code that was erroneously relying on this behavior.
131 - [Add armv5te-none-eabi and thumbv5te-none-eabi tier 3 targets](https://github.com/rust-lang/rust/pull/101329/)
132 - Refer to Rust's [platform support page][platform-support-doc] for more
133 information on Rust's tiered platform support.
134 - [Add support for linking against macOS universal libraries](https://github.com/rust-lang/rust/pull/98736)
138 - [Fix `#[derive(Default)]` on a generic `#[default]` enum adding unnecessary `Default` bounds](https://github.com/rust-lang/rust/pull/101040/)
139 - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101821/)
144 - [`proc_macro::Span::source_text`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.source_text)
145 - [`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)
146 - [`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)
147 - [`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)
148 - [`BTreeSet::{first, last, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.first)
149 - [`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)
150 - [Add `AsFd` implementations for stdio lock types on WASI.](https://github.com/rust-lang/rust/pull/101768/)
151 - [`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)
152 - [`core::hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
153 - [`Duration::try_from_secs_{f32,f64}`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.try_from_secs_f32)
154 - [`Option::unzip`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unzip)
155 - [`std::os::fd`](https://doc.rust-lang.org/stable/std/os/fd/index.html)
161 - [Add Rustdoc warning for invalid HTML tags in the documentation](https://github.com/rust-lang/rust/pull/101720/)
166 - [Added `cargo remove` to remove dependencies from Cargo.toml](https://doc.rust-lang.org/nightly/cargo/commands/cargo-remove.html)
167 - [`cargo publish` now waits for the new version to be downloadable before exiting](https://github.com/rust-lang/cargo/pull/11062)
169 See [detailed release notes](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-166-2022-12-15) for more.
174 - [Only apply `ProceduralMasquerade` hack to older versions of `rental`](https://github.com/rust-lang/rust/pull/94063/)
175 - [Don't export `__heap_base` and `__data_end` on wasm32-wasi.](https://github.com/rust-lang/rust/pull/102385/)
176 - [Don't export `__wasm_init_memory` on WebAssembly.](https://github.com/rust-lang/rust/pull/102426/)
177 - [Only export `__tls_*` on wasm32-unknown-unknown.](https://github.com/rust-lang/rust/pull/102440/)
178 - [Don't link to `libresolv` in libstd on Darwin](https://github.com/rust-lang/rust/pull/102766/)
179 - [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/)
180 - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
181 This is a soundness fix which may break code that was erroneously relying on this behavior.
182 - [Make `order_dependent_trait_objects` show up in future-breakage reports](https://github.com/rust-lang/rust/pull/102635/)
183 - [Change std::process::Command spawning to default to inheriting the parent's signal mask](https://github.com/rust-lang/rust/pull/101077/)
188 These changes do not affect any public interfaces of Rust, but they represent
189 significant improvements to the performance or internals of rustc and related
192 - [Enable BOLT for LLVM compilation](https://github.com/rust-lang/rust/pull/94381/)
193 - [Enable LTO for rustc_driver.so](https://github.com/rust-lang/rust/pull/101403/)
195 Version 1.65.0 (2022-11-03)
196 ==========================
200 - [Error on `as` casts of enums with `#[non_exhaustive]` variants](https://github.com/rust-lang/rust/pull/92744/)
201 - [Stabilize `let else`](https://github.com/rust-lang/rust/pull/93628/)
202 - [Stabilize generic associated types (GATs)](https://github.com/rust-lang/rust/pull/96709/)
203 - [Add lints `let_underscore_drop` and `let_underscore_lock` from Clippy](https://github.com/rust-lang/rust/pull/97739/)
204 - [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")](https://github.com/rust-lang/rust/pull/99332/)
205 - [Uninitialized integers, floats, and raw pointers are now considered immediate UB](https://github.com/rust-lang/rust/pull/98919/).
206 Usage of `MaybeUninit` is the correct way to work with uninitialized memory.
207 - [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a](https://github.com/rust-lang/rust/pull/99916/)
208 - [Do not allow `Drop` impl on foreign ADTs](https://github.com/rust-lang/rust/pull/99576/)
212 - [Stabilize -Csplit-debuginfo on Linux](https://github.com/rust-lang/rust/pull/98051/)
213 - [Use niche-filling optimization even when multiple variants have data](https://github.com/rust-lang/rust/pull/94075/)
214 - [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)
215 - [Stringify non-shorthand visibility correctly](https://github.com/rust-lang/rust/pull/100350/)
216 - [Normalize struct field types when unsizing](https://github.com/rust-lang/rust/pull/101831/)
217 - [Update to LLVM 15](https://github.com/rust-lang/rust/pull/99464/)
218 - [Fix aarch64 call abi to correctly zeroext when needed](https://github.com/rust-lang/rust/pull/97800/)
219 - [debuginfo: Generalize C++-like encoding for enums](https://github.com/rust-lang/rust/pull/98393/)
220 - [Add `special_module_name` lint](https://github.com/rust-lang/rust/pull/94467/)
221 - [Add support for generating unique profraw files by default when using `-C instrument-coverage`](https://github.com/rust-lang/rust/pull/100384/)
222 - [Allow dynamic linking for iOS/tvOS targets](https://github.com/rust-lang/rust/pull/100636/)
226 - [Add armv4t-none-eabi as a tier 3 target](https://github.com/rust-lang/rust/pull/100244/)
227 - [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets](https://github.com/rust-lang/rust/pull/101025/)
228 - Refer to Rust's [platform support page][platform-support-doc] for more
229 information on Rust's tiered platform support.
234 - [Don't generate `PartialEq::ne` in derive(PartialEq)](https://github.com/rust-lang/rust/pull/98655/)
235 - [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default](https://github.com/rust-lang/rust/pull/101325/)
236 - [Forbid mixing `System` with direct system allocator calls](https://github.com/rust-lang/rust/pull/101394/)
237 - [Document no support for writing to non-blocking stdio/stderr](https://github.com/rust-lang/rust/pull/101416/)
238 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295)
239 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
244 - [`std::backtrace::Backtrace`](https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html)
245 - [`Bound::as_ref`](https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref)
246 - [`std::io::read_to_string`](https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html)
247 - [`<*const T>::cast_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut)
248 - [`<*mut T>::cast_const`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const)
250 These APIs are now stable in const contexts:
252 - [`<*const T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
253 - [`<*mut T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
258 - [Apply GitHub fast path even for partial hashes](https://github.com/rust-lang/cargo/pull/10807/)
259 - [Do not add home bin path to PATH if it's already there](https://github.com/rust-lang/cargo/pull/11023/)
260 - [Take priority into account within the pending queue](https://github.com/rust-lang/cargo/pull/11032/).
261 This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds.
266 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295).
267 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
268 - [`PollFn` now only implements `Unpin` if the closure is `Unpin`](https://github.com/rust-lang/rust/pull/102737).
269 This is a possible breaking change if users were relying on the blanket unpin implementation.
270 See discussion on the PR for details of why this change was made.
271 - [Drop ExactSizeIterator impl from std::char::EscapeAscii](https://github.com/rust-lang/rust/pull/99880)
272 This is a backwards-incompatible change to the standard library's surface
273 area, but is unlikely to affect real world usage.
274 - [Do not consider a single repeated lifetime eligible for elision in the return type](https://github.com/rust-lang/rust/pull/103450)
275 This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again.
276 - [Reenable disabled early syntax gates as future-incompatibility lints](https://github.com/rust-lang/rust/pull/99935/)
277 - [Update the minimum external LLVM to 13](https://github.com/rust-lang/rust/pull/100460/)
278 - [Don't duplicate file descriptors into stdio fds](https://github.com/rust-lang/rust/pull/101426/)
279 - [Sunset RLS](https://github.com/rust-lang/rust/pull/100863/)
280 - [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type](https://github.com/rust-lang/rust/pull/99784/)
281 This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny.
282 - [`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)
283 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.
284 - 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].
286 [102754]: https://github.com/rust-lang/rust/issues/102754
291 These changes do not affect any public interfaces of Rust, but they represent
292 significant improvements to the performance or internals of rustc and related
295 - [Add `x.sh` and `x.ps1` shell scripts](https://github.com/rust-lang/rust/pull/99992/)
296 - [compiletest: use target cfg instead of hard-coded tables](https://github.com/rust-lang/rust/pull/100260/)
297 - [Use object instead of LLVM for reading bitcode from rlibs](https://github.com/rust-lang/rust/pull/98100/)
298 - [Enable MIR inlining for optimized compilations](https://github.com/rust-lang/rust/pull/91743)
299 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).
301 Version 1.64.0 (2022-09-22)
302 ===========================
306 - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
307 - 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/)
308 - 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.
312 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
313 - Refer to Rust's [platform support page][platform-support-doc] for more
314 information on Rust's tiered platform support.
315 - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
316 - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
317 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
321 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
322 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
323 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
324 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
325 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
326 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
327 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
328 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
333 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
334 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
335 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
336 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
337 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
338 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
339 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
340 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
341 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
342 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
343 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
344 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
345 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
346 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
347 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
348 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
349 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
350 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
351 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
353 These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
355 - [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
356 - [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
357 - [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
358 - [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
359 - [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
360 - [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
362 These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
364 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
365 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
366 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
367 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
368 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
369 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
370 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
371 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
372 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
373 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
374 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
375 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
376 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
378 These APIs are now usable in const contexts:
380 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
384 - [Packages can now inherit settings from the workspace so that the settings
385 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
386 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
388 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
389 for more details on how to define these common settings.
390 - [Cargo commands can now accept multiple `--target` flags to build for
391 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
392 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
393 config option may now take an array of multiple targets.
394 - [The `--jobs` argument can now take a negative number to count backwards from
395 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
396 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
397 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
398 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
399 flag to `cargo rustc` to override the crate type.
400 - [Significantly improved the performance fetching git dependencies from GitHub
401 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
405 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
409 - 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/)
410 - [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.
411 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
412 - [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.
413 - [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.
414 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
415 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
416 - 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/).
417 - [`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.
422 These changes do not affect any public interfaces of Rust, but they represent
423 significant improvements to the performance or internals of rustc and related
426 - 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/)
427 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
428 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
429 - Many improvements to generated code for derives, including performance improvements:
430 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
431 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
432 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
433 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
434 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
435 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
436 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
437 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
438 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
439 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
440 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
442 Version 1.63.0 (2022-08-11)
443 ==========================
447 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
448 - [Modify MIR building to drop repeat expressions with length zero.][95953]
449 - [Remove label/lifetime shadowing warnings.][96296]
450 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
451 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
452 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
453 - [lub: don't bail out due to empty binders.][97867]
457 - [Stabilize the `bundle` native library modifier,][95818] also removing the
458 deprecated `static-nobundle` linking kind.
459 - [Add Apple WatchOS compile targets\*.][95243]
460 - [Add a Windows application manifest to rustc-main.][96737]
462 \* Refer to Rust's [platform support page][platform-support-doc] for more
463 information on Rust's tiered platform support.
467 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
468 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
469 - [`impl Read and Write for VecDeque<u8>`.][95632]
470 - [STD support for the Nintendo 3DS.][95897]
471 - [Use rounding in float to Duration conversion methods.][96051]
472 - [Make write/print macros eagerly drop temporaries.][96455]
473 - [Implement internal traits that enable `[OsStr]::join`.][96881]
474 - [Implement `Hash` for `core::alloc::Layout`.][97034]
475 - [Add capacity documentation for `OsString`.][97202]
476 - [Put a bound on collection misbehavior.][97316]
477 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
478 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
479 - [Document Rust's stance on `/proc/self/mem`.][97837]
486 - [`BinaryHeap::try_reserve`]
487 - [`BinaryHeap::try_reserve_exact`]
488 - [`OsString::try_reserve`]
489 - [`OsString::try_reserve_exact`]
490 - [`PathBuf::try_reserve`]
491 - [`PathBuf::try_reserve_exact`]
492 - [`Path::try_exists`]
493 - [`Ref::filter_map`]
494 - [`RefMut::filter_map`]
495 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
496 - [`ToOwned::clone_into`]
497 - [`Ipv6Addr::to_ipv4_mapped`]
499 - [`unix::io::BorrowedFd<'fd>`]
500 - [`unix::io::OwnedFd`]
501 - [`windows::io::AsHandle`]
502 - [`windows::io::BorrowedHandle<'handle>`]
503 - [`windows::io::OwnedHandle`]
504 - [`windows::io::HandleOrInvalid`]
505 - [`windows::io::HandleOrNull`]
506 - [`windows::io::InvalidHandleError`]
507 - [`windows::io::NullHandleError`]
508 - [`windows::io::AsSocket`]
509 - [`windows::io::BorrowedSocket<'handle>`]
510 - [`windows::io::OwnedSocket`]
513 - [`thread::ScopedJoinHandle`]
515 These APIs are now usable in const contexts:
517 - [`array::from_ref`]
518 - [`slice::from_ref`]
519 - [`intrinsics::copy`]
520 - [`intrinsics::copy_nonoverlapping`]
521 - [`<*const T>::copy_to`]
522 - [`<*const T>::copy_to_nonoverlapping`]
523 - [`<*mut T>::copy_to`]
524 - [`<*mut T>::copy_to_nonoverlapping`]
525 - [`<*mut T>::copy_from`]
526 - [`<*mut T>::copy_from_nonoverlapping`]
528 - [`Utf8Error::error_len`]
529 - [`Utf8Error::valid_up_to`]
536 - [Stabilize the `--config path` command-line argument.][cargo/10755]
537 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
542 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
543 errors for invalid attribute arguments that were previously ignored.
544 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
545 duration can differ slightly from what it was.
550 These changes provide no direct user facing benefits, but represent significant
551 improvements to the internals and overall performance of rustc
554 - [Prepare Rust for LLVM opaque pointers.][94214]
556 [94214]: https://github.com/rust-lang/rust/pull/94214/
557 [94530]: https://github.com/rust-lang/rust/pull/94530/
558 [94954]: https://github.com/rust-lang/rust/pull/94954/
559 [95243]: https://github.com/rust-lang/rust/pull/95243/
560 [95565]: https://github.com/rust-lang/rust/pull/95565/
561 [95632]: https://github.com/rust-lang/rust/pull/95632/
562 [95818]: https://github.com/rust-lang/rust/pull/95818/
563 [95897]: https://github.com/rust-lang/rust/pull/95897/
564 [95953]: https://github.com/rust-lang/rust/pull/95953/
565 [96051]: https://github.com/rust-lang/rust/pull/96051/
566 [96296]: https://github.com/rust-lang/rust/pull/96296/
567 [96455]: https://github.com/rust-lang/rust/pull/96455/
568 [96737]: https://github.com/rust-lang/rust/pull/96737/
569 [96868]: https://github.com/rust-lang/rust/pull/96868/
570 [96881]: https://github.com/rust-lang/rust/pull/96881/
571 [96885]: https://github.com/rust-lang/rust/pull/96885/
572 [96959]: https://github.com/rust-lang/rust/pull/96959/
573 [97034]: https://github.com/rust-lang/rust/pull/97034/
574 [97202]: https://github.com/rust-lang/rust/pull/97202/
575 [97316]: https://github.com/rust-lang/rust/pull/97316/
576 [97652]: https://github.com/rust-lang/rust/pull/97652/
577 [97675]: https://github.com/rust-lang/rust/pull/97675/
578 [97803]: https://github.com/rust-lang/rust/pull/97803/
579 [97837]: https://github.com/rust-lang/rust/pull/97837/
580 [97867]: https://github.com/rust-lang/rust/pull/97867/
581 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
582 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
584 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
585 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
586 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
587 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
588 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
589 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
590 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
591 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
592 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
593 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
594 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
595 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
596 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
597 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
598 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
599 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
600 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
601 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
602 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
603 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
604 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
605 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
606 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
607 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
608 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
609 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
610 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
611 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
612 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
613 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
615 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
616 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
617 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
618 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
619 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
620 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
621 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
622 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
623 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
624 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
625 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
626 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
627 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
628 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
629 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
630 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
632 Version 1.62.1 (2022-07-19)
633 ==========================
635 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
636 library, and also mitigates a CPU vulnerability on Intel SGX.
638 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
639 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
640 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
641 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
642 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
644 [98608]: https://github.com/rust-lang/rust/issues/98608
645 [98890]: https://github.com/rust-lang/rust/issues/98890
646 [98950]: https://github.com/rust-lang/rust/pull/98950
647 [98126]: https://github.com/rust-lang/rust/pull/98126
648 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
650 Version 1.62.0 (2022-06-30)
651 ==========================
656 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
657 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
658 - [Fix constants not getting dropped if part of a diverging expression][94775]
659 - [Support unit struct/enum variant in destructuring assignment][95380]
660 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
661 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
666 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
667 - [Make `unaligned_references` lint deny-by-default][95372]
668 This lint is also a future compatibility lint, and is expected to eventually
670 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
671 - [Reject `#[thread_local]` attribute on non-static items][95006]
672 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
673 - [Implement a lint to warn about unused macro rules][96150]
674 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
676 \* Refer to Rust's [platform support page][platform-support-doc] for more
677 information on Rust's tiered platform support.
682 - [Windows: Use a pipe relay for chaining pipes][95841]
683 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
684 - [Replace RwLock by a futex based one on Linux][95801]
685 - [std: directly use pthread in UNIX parker implementation][96393]
690 - [`bool::then_some`]
694 - [`windows::CommandExt::raw_arg`]
695 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
696 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
697 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
698 - [`FusedIterator for EncodeWide`]
699 - [RDM intrinsics on aarch64][stdarch/1285]
704 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
709 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
711 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
712 - Package ID specs now support `name@version` syntax in addition to the
713 previous `name:version` to align with the behavior in `cargo add` and other
714 tools. `cargo install` and `cargo yank` also now support this syntax so the
715 version does not need to passed as a separate flag.
716 - The `git` and `registry` directories in Cargo's home directory (usually
717 `~/.cargo`) are now marked as cache directories so that they are not
718 included in backups or content indexing (on Windows).
719 - Added automatic `@` argfile support, which will use "response files" if the
720 command-line to `rustc` exceeds the operating system's limit.
725 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
726 the same as the host target.
727 [#10594](https://github.com/rust-lang/cargo/pull/10594)
728 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
729 - [rustdoc: Remove .woff font files][96279]
730 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
731 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
732 complete synchronously][95469].
737 - [Unify ReentrantMutex implementations across all platforms][96042]
739 These changes provide no direct user facing benefits, but represent significant
740 improvements to the internals and overall performance of rustc
743 [93313]: https://github.com/rust-lang/rust/pull/93313/
744 [93969]: https://github.com/rust-lang/rust/pull/93969/
745 [94206]: https://github.com/rust-lang/rust/pull/94206/
746 [94457]: https://github.com/rust-lang/rust/pull/94457/
747 [94775]: https://github.com/rust-lang/rust/pull/94775/
748 [94872]: https://github.com/rust-lang/rust/pull/94872/
749 [95006]: https://github.com/rust-lang/rust/pull/95006/
750 [95035]: https://github.com/rust-lang/rust/pull/95035/
751 [95346]: https://github.com/rust-lang/rust/pull/95346/
752 [95372]: https://github.com/rust-lang/rust/pull/95372/
753 [95380]: https://github.com/rust-lang/rust/pull/95380/
754 [95431]: https://github.com/rust-lang/rust/pull/95431/
755 [95469]: https://github.com/rust-lang/rust/pull/95469/
756 [95705]: https://github.com/rust-lang/rust/pull/95705/
757 [95801]: https://github.com/rust-lang/rust/pull/95801/
758 [95819]: https://github.com/rust-lang/rust/pull/95819/
759 [95841]: https://github.com/rust-lang/rust/pull/95841/
760 [96042]: https://github.com/rust-lang/rust/pull/96042/
761 [96150]: https://github.com/rust-lang/rust/pull/96150/
762 [96268]: https://github.com/rust-lang/rust/pull/96268/
763 [96279]: https://github.com/rust-lang/rust/pull/96279/
764 [96393]: https://github.com/rust-lang/rust/pull/96393/
765 [96436]: https://github.com/rust-lang/rust/pull/96436/
766 [96557]: https://github.com/rust-lang/rust/pull/96557/
767 [96630]: https://github.com/rust-lang/rust/pull/96630/
769 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
770 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
771 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
772 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
773 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
774 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
775 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
776 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
777 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
778 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
780 Version 1.61.0 (2022-05-19)
781 ==========================
786 - [`const fn` signatures can now include generic trait bounds][93827]
787 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
788 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
789 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
794 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
795 - [The `char` type is now described as UTF-32 in debuginfo][89887]
796 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
797 - X86 [`#[target_feature = "adx"]` is now stable][93745]
802 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
803 - [`#[ignore = "…"]` messages are printed when running tests][92714]
804 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
805 - [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.
806 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
807 - [`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.
812 - [`Pin::static_mut`]
813 - [`Pin::static_ref`]
814 - [`Vec::retain_mut`]
815 - [`VecDeque::retain_mut`]
816 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
817 - [`std::os::unix::net::SocketAddr::from_pathname`]
818 - [`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.
819 - [`std::thread::JoinHandle::is_finished`]
821 These APIs are now usable in const contexts:
823 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
824 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
825 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
826 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
827 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
828 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
829 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
830 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
831 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
836 No feature changes, but see compatibility notes.
841 - 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
842 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
843 - (less common) or be updated to use the [`+whole-archive`] modifier.
844 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
845 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
846 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
847 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
848 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
849 - [`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`.
850 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
855 These changes provide no direct user facing benefits, but represent significant
856 improvements to the internals and overall performance of rustc
859 - [debuginfo: Refactor debuginfo generation for types][94261]
860 - [Remove the everybody loops pass][93913]
862 [88375]: https://github.com/rust-lang/rust/pull/88375/
863 [89887]: https://github.com/rust-lang/rust/pull/89887/
864 [90621]: https://github.com/rust-lang/rust/pull/90621/
865 [92285]: https://github.com/rust-lang/rust/pull/92285/
866 [92472]: https://github.com/rust-lang/rust/pull/92472/
867 [92697]: https://github.com/rust-lang/rust/pull/92697/
868 [92714]: https://github.com/rust-lang/rust/pull/92714/
869 [92911]: https://github.com/rust-lang/rust/pull/92911/
870 [93263]: https://github.com/rust-lang/rust/pull/93263/
871 [93745]: https://github.com/rust-lang/rust/pull/93745/
872 [93827]: https://github.com/rust-lang/rust/pull/93827/
873 [93901]: https://github.com/rust-lang/rust/pull/93901/
874 [93913]: https://github.com/rust-lang/rust/pull/93913/
875 [93965]: https://github.com/rust-lang/rust/pull/93965/
876 [94081]: https://github.com/rust-lang/rust/pull/94081/
877 [94261]: https://github.com/rust-lang/rust/pull/94261/
878 [94295]: https://github.com/rust-lang/rust/pull/94295/
879 [94832]: https://github.com/rust-lang/rust/pull/94832/
880 [95016]: https://github.com/rust-lang/rust/pull/95016/
881 [95251]: https://github.com/rust-lang/rust/pull/95251/
882 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
883 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
884 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
885 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
886 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
887 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
888 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
889 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
890 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
891 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
892 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
893 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
894 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
895 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
896 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
897 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
898 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
899 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
900 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
901 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
902 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
903 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
906 Version 1.60.0 (2022-04-07)
907 ==========================
911 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
912 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
916 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
917 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
918 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
919 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
920 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
921 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
922 - [Fix invalid removal of newlines from doc comments][92357]
923 - [Add kernel target for RustyHermit][92670]
924 - [Deny mixing bin crate type with lib crate types][92933]
925 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
926 - [Upgrade to LLVM 14][93577]
928 \* Refer to Rust's [platform support page][platform-support-doc] for more
929 information on Rust's tiered platform support.
933 - [Guarantee call order for `sort_by_cached_key`][89621]
934 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
935 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
936 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
937 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
941 - [`Arc::new_cyclic`][arc_new_cyclic]
942 - [`Rc::new_cyclic`][rc_new_cyclic]
943 - [`slice::EscapeAscii`][slice_escape_ascii]
944 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
945 - [`u8::escape_ascii`][u8_escape_ascii]
946 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
947 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
948 - [`MaybeUninit::assume_init_read`][assume_init_read]
949 - [`i8::abs_diff`][i8_abs_diff]
950 - [`i16::abs_diff`][i16_abs_diff]
951 - [`i32::abs_diff`][i32_abs_diff]
952 - [`i64::abs_diff`][i64_abs_diff]
953 - [`i128::abs_diff`][i128_abs_diff]
954 - [`isize::abs_diff`][isize_abs_diff]
955 - [`u8::abs_diff`][u8_abs_diff]
956 - [`u16::abs_diff`][u16_abs_diff]
957 - [`u32::abs_diff`][u32_abs_diff]
958 - [`u64::abs_diff`][u64_abs_diff]
959 - [`u128::abs_diff`][u128_abs_diff]
960 - [`usize::abs_diff`][usize_abs_diff]
961 - [`Display for io::ErrorKind`][display_error_kind]
962 - [`From<u8> for ExitCode`][from_u8_exit_code]
963 - [`Not for !` (the "never" type)][not_never]
964 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
965 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
969 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
970 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
971 - [Stabilize namespaced and weak dependency features.][cargo/10269]
972 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
973 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
977 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
978 - [Drop rustc-docs from complete profile][93742]
979 - [bootstrap: tidy up flag handling for llvm build][93918]
983 - [Remove compiler-rt linking hack on Android][83822]
984 - [Mitigations for platforms with non-monotonic clocks have been removed from
985 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
986 instant is not guaranteed to be greater than an earlier instant anymore.
987 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
988 saturating to `0` instead][89926]. In the real world the panic happened mostly
989 on platforms with buggy monotonic clock implementations rather than catching
990 programming errors like reversing the start and end times. Such programming
991 errors will now results in `0` rather than a panic.
992 - In a future release we're planning to increase the baseline requirements for
993 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
994 your feedback in [PR #95026][95026].
999 These changes provide no direct user facing benefits, but represent significant
1000 improvements to the internals and overall performance of rustc
1003 - [Switch all libraries to the 2021 edition][92068]
1005 [83822]: https://github.com/rust-lang/rust/pull/83822
1006 [86374]: https://github.com/rust-lang/rust/pull/86374
1007 [87487]: https://github.com/rust-lang/rust/pull/87487
1008 [89621]: https://github.com/rust-lang/rust/pull/89621
1009 [89926]: https://github.com/rust-lang/rust/pull/89926
1010 [90132]: https://github.com/rust-lang/rust/pull/90132
1011 [90247]: https://github.com/rust-lang/rust/pull/90247
1012 [91606]: https://github.com/rust-lang/rust/pull/91606
1013 [92068]: https://github.com/rust-lang/rust/pull/92068
1014 [92300]: https://github.com/rust-lang/rust/pull/92300
1015 [92357]: https://github.com/rust-lang/rust/pull/92357
1016 [92383]: https://github.com/rust-lang/rust/pull/92383
1017 [92630]: https://github.com/rust-lang/rust/pull/92630
1018 [92670]: https://github.com/rust-lang/rust/pull/92670
1019 [92800]: https://github.com/rust-lang/rust/pull/92800
1020 [92933]: https://github.com/rust-lang/rust/pull/92933
1021 [93566]: https://github.com/rust-lang/rust/pull/93566
1022 [93577]: https://github.com/rust-lang/rust/pull/93577
1023 [93658]: https://github.com/rust-lang/rust/pull/93658
1024 [93742]: https://github.com/rust-lang/rust/pull/93742
1025 [93824]: https://github.com/rust-lang/rust/pull/93824
1026 [93918]: https://github.com/rust-lang/rust/pull/93918
1027 [95026]: https://github.com/rust-lang/rust/pull/95026
1029 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
1030 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
1031 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
1032 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
1033 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
1035 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
1036 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
1037 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
1038 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
1039 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
1040 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
1041 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
1042 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
1043 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
1044 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
1045 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
1046 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
1047 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
1048 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
1049 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
1050 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
1051 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
1052 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
1053 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
1054 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
1055 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
1056 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
1057 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
1058 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
1059 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
1061 Version 1.59.0 (2022-02-24)
1062 ==========================
1067 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
1068 - [Stabilize destructuring assignment][90521]
1069 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
1070 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
1075 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
1076 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
1077 - [Fix sparc64 ABI for aggregates with floating point members][91003]
1078 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
1079 - [Add support for riscv64gc-unknown-freebsd][91284]
1080 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
1081 - [Soft disable incremental compilation][94124]
1083 This release disables incremental compilation, unless the user has explicitly
1084 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1085 This is due to a known and relatively frequently occurring bug in incremental
1086 compilation, which causes builds to issue internal compiler errors. This
1087 particular bug is already fixed on nightly, but that fix has not yet rolled out
1088 to stable and is deemed too risky for a direct stable backport.
1090 As always, we encourage users to test with nightly and report bugs so that we
1091 can track failures and fix issues earlier.
1093 See [94124] for more details.
1095 [94124]: https://github.com/rust-lang/rust/issues/94124
1100 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
1105 - [`std::thread::available_parallelism`][available_parallelism]
1106 - [`Result::copied`][result-copied]
1107 - [`Result::cloned`][result-cloned]
1108 - [`arch::asm!`][asm]
1109 - [`arch::global_asm!`][global_asm]
1110 - [`ops::ControlFlow::is_break`][is_break]
1111 - [`ops::ControlFlow::is_continue`][is_continue]
1112 - [`TryFrom<char> for u8`][try_from_char_u8]
1113 - [`char::TryFromCharError`][try_from_char_err]
1114 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
1115 - [`iter::zip`][zip]
1116 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
1117 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
1118 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
1119 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
1120 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
1121 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
1122 - [`DoubleEndedIterator for ToLowercase`][lowercase]
1123 - [`DoubleEndedIterator for ToUppercase`][uppercase]
1124 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
1125 - [`UnwindSafe for Once`][unwindsafe_once]
1126 - [`RefUnwindSafe for Once`][refunwindsafe_once]
1127 - [armv8 neon intrinsics for aarch64][stdarch/1266]
1131 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
1132 - [`mem::MaybeUninit::assume_init`][muninit_init]
1133 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
1134 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
1139 - [Stabilize the `strip` profile option][cargo/10088]
1140 - [Stabilize future-incompat-report][cargo/10165]
1141 - [Support abbreviating `--release` as `-r`][cargo/10133]
1142 - [Support `term.quiet` configuration][cargo/10152]
1143 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
1148 - [Refactor weak symbols in std::sys::unix][90846]
1149 This may add new, versioned, symbols when building with a newer glibc, as the
1150 standard library uses weak linkage rather than dynamically attempting to load
1151 certain symbols at runtime.
1152 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
1153 This adds a future compatibility lint to supporting the use of cfg_attr
1154 wrapping either crate_type or crate_name specification within Rust files;
1155 it is recommended that users migrate to setting the equivalent command line
1157 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
1158 This may expose new names, leading to conflicts with preexisting names in a
1159 given namespace and a compilation failure.
1160 - [Cargo will document libraries before binaries.][cargo/10172]
1161 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
1162 - [Weaken guarantee around advancing underlying iterators in zip][83791]
1163 - [Make split_inclusive() on an empty slice yield an empty output][89825]
1164 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
1165 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
1170 These changes provide no direct user facing benefits, but represent significant
1171 improvements to the internals and overall performance of rustc
1174 - [Fix many cases of normalization-related ICEs][91255]
1175 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
1176 - [Store liveness in interval sets for region inference][90637]
1178 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
1179 unstable feature.][91867]
1181 [91867]: https://github.com/rust-lang/rust/issues/91867
1182 [83744]: https://github.com/rust-lang/rust/pull/83744/
1183 [83791]: https://github.com/rust-lang/rust/pull/83791/
1184 [85013]: https://github.com/rust-lang/rust/pull/85013/
1185 [89825]: https://github.com/rust-lang/rust/pull/89825/
1186 [89999]: https://github.com/rust-lang/rust/pull/89999/
1187 [90128]: https://github.com/rust-lang/rust/pull/90128/
1188 [90207]: https://github.com/rust-lang/rust/pull/90207/
1189 [90521]: https://github.com/rust-lang/rust/pull/90521/
1190 [90586]: https://github.com/rust-lang/rust/pull/90586/
1191 [90637]: https://github.com/rust-lang/rust/pull/90637/
1192 [90833]: https://github.com/rust-lang/rust/pull/90833/
1193 [90846]: https://github.com/rust-lang/rust/pull/90846/
1194 [91003]: https://github.com/rust-lang/rust/pull/91003/
1195 [91172]: https://github.com/rust-lang/rust/pull/91172/
1196 [91255]: https://github.com/rust-lang/rust/pull/91255/
1197 [91284]: https://github.com/rust-lang/rust/pull/91284/
1198 [91535]: https://github.com/rust-lang/rust/pull/91535/
1199 [91593]: https://github.com/rust-lang/rust/pull/91593/
1200 [91728]: https://github.com/rust-lang/rust/pull/91728/
1201 [91878]: https://github.com/rust-lang/rust/pull/91878/
1202 [91896]: https://github.com/rust-lang/rust/pull/91896/
1203 [91926]: https://github.com/rust-lang/rust/pull/91926/
1204 [91984]: https://github.com/rust-lang/rust/pull/91984/
1205 [92020]: https://github.com/rust-lang/rust/pull/92020/
1206 [92034]: https://github.com/rust-lang/rust/pull/92034/
1207 [92137]: https://github.com/rust-lang/rust/pull/92137/
1208 [92483]: https://github.com/rust-lang/rust/pull/92483/
1209 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
1210 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
1211 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
1212 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
1213 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
1214 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
1215 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
1216 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
1218 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
1219 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
1220 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
1221 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1222 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
1223 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
1224 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
1225 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
1226 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
1227 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
1228 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
1229 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
1230 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
1231 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
1232 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
1233 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
1234 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
1235 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
1236 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
1237 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
1238 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
1239 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
1240 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
1241 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
1242 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
1243 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
1245 Version 1.58.1 (2022-01-19)
1246 ===========================
1248 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
1249 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
1250 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
1251 * [Fix wrong error message displayed when some imports are missing][91254]
1252 * [Fix rustfmt not formatting generated files from stdin][92912]
1254 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
1255 [91254]: https://github.com/rust-lang/rust/pull/91254
1256 [92912]: https://github.com/rust-lang/rust/pull/92912
1257 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
1258 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
1260 Version 1.58.0 (2022-01-13)
1261 ==========================
1266 - [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.
1267 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
1268 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
1273 - [Add LLVM CFI support to the Rust compiler][89652]
1274 - [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.
1275 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
1276 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
1277 - [Update the minimum external LLVM to 12][90175]
1278 - [Add `x86_64-unknown-none` at Tier 3*][89062]
1279 - [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.
1280 - [Don't abort compilation after giving a lint error][87337]
1281 - [Error messages point at the source of trait bound obligations in more places][89580]
1283 \* Refer to Rust's [platform support page][platform-support-doc] for more
1284 information on Rust's tiered platform support.
1289 - [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.
1290 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
1291 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
1292 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
1293 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
1294 - [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).
1299 - [`Metadata::is_symlink`]
1300 - [`Path::is_symlink`]
1301 - [`{integer}::saturating_div`]
1302 - [`Option::unwrap_unchecked`]
1303 - [`Result::unwrap_unchecked`]
1304 - [`Result::unwrap_err_unchecked`]
1307 These APIs are now usable in const contexts:
1310 - [`Duration::checked_add`]
1311 - [`Duration::saturating_add`]
1312 - [`Duration::checked_sub`]
1313 - [`Duration::saturating_sub`]
1314 - [`Duration::checked_mul`]
1315 - [`Duration::saturating_mul`]
1316 - [`Duration::checked_div`]
1321 - [Add --message-format for install command][cargo/10107]
1322 - [Warn when alias shadows external subcommand][cargo/10082]
1327 - [Show all Deref implementations recursively in rustdoc][90183]
1328 - [Use computed visibility in rustdoc][88447]
1333 - [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.
1334 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1335 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1336 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1337 - [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.
1338 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1343 These changes provide no direct user facing benefits, but represent significant
1344 improvements to the internals and overall performance of rustc
1347 - [Implement coherence checks for negative trait impls][90104]
1348 - [Add rustc lint, warning when iterating over hashmaps][89558]
1349 - [Optimize live point computation][90491]
1350 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1351 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1353 [87337]: https://github.com/rust-lang/rust/pull/87337/
1354 [87467]: https://github.com/rust-lang/rust/pull/87467/
1355 [87704]: https://github.com/rust-lang/rust/pull/87704/
1356 [88041]: https://github.com/rust-lang/rust/pull/88041/
1357 [88447]: https://github.com/rust-lang/rust/pull/88447/
1358 [88601]: https://github.com/rust-lang/rust/pull/88601/
1359 [89062]: https://github.com/rust-lang/rust/pull/89062/
1360 [89174]: https://github.com/rust-lang/rust/pull/89174/
1361 [89551]: https://github.com/rust-lang/rust/pull/89551/
1362 [89558]: https://github.com/rust-lang/rust/pull/89558/
1363 [89580]: https://github.com/rust-lang/rust/pull/89580/
1364 [89652]: https://github.com/rust-lang/rust/pull/89652/
1365 [90041]: https://github.com/rust-lang/rust/pull/90041/
1366 [90058]: https://github.com/rust-lang/rust/pull/90058/
1367 [90104]: https://github.com/rust-lang/rust/pull/90104/
1368 [90117]: https://github.com/rust-lang/rust/pull/90117/
1369 [90175]: https://github.com/rust-lang/rust/pull/90175/
1370 [90183]: https://github.com/rust-lang/rust/pull/90183/
1371 [90297]: https://github.com/rust-lang/rust/pull/90297/
1372 [90329]: https://github.com/rust-lang/rust/pull/90329/
1373 [90361]: https://github.com/rust-lang/rust/pull/90361/
1374 [90417]: https://github.com/rust-lang/rust/pull/90417/
1375 [90473]: https://github.com/rust-lang/rust/pull/90473/
1376 [90491]: https://github.com/rust-lang/rust/pull/90491/
1377 [90733]: https://github.com/rust-lang/rust/pull/90733/
1378 [90833]: https://github.com/rust-lang/rust/pull/90833/
1379 [90846]: https://github.com/rust-lang/rust/pull/90846/
1380 [91026]: https://github.com/rust-lang/rust/pull/91026/
1381 [91207]: https://github.com/rust-lang/rust/pull/91207/
1382 [91255]: https://github.com/rust-lang/rust/pull/91255/
1383 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1384 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1385 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1386 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1387 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1388 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1389 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1390 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1391 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1392 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1394 Version 1.57.0 (2021-12-02)
1395 ==========================
1400 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1401 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1402 - [Allow panicking in constant evaluation.][89508]
1403 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1408 - [Create more accurate debuginfo for vtables.][89597]
1409 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1410 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1411 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1412 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1414 \* Refer to Rust's [platform support page][platform-support-doc] for more
1415 information on Rust's tiered platform support.
1420 - [Avoid allocations and copying in `Vec::leak`][89337]
1421 - [Add `#[repr(i8)]` to `Ordering`][89507]
1422 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1423 - [Update to Unicode 14.0][89614]
1424 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1425 when ignoring their return value. This helps catch mistakes such as expecting
1426 a function to mutate a value in place rather than return a new value.
1431 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1432 - [`[T; N]::as_slice`][`array::as_slice`]
1433 - [`collections::TryReserveError`]
1434 - [`HashMap::try_reserve`]
1435 - [`HashSet::try_reserve`]
1436 - [`String::try_reserve`]
1437 - [`String::try_reserve_exact`]
1438 - [`Vec::try_reserve`]
1439 - [`Vec::try_reserve_exact`]
1440 - [`VecDeque::try_reserve`]
1441 - [`VecDeque::try_reserve_exact`]
1442 - [`Iterator::map_while`]
1443 - [`iter::MapWhile`]
1444 - [`proc_macro::is_available`]
1445 - [`Command::get_program`]
1446 - [`Command::get_args`]
1447 - [`Command::get_envs`]
1448 - [`Command::get_current_dir`]
1452 These APIs are now usable in const contexts:
1454 - [`hint::unreachable_unchecked`]
1459 - [Stabilize custom profiles][cargo/9943]
1464 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1465 This will break some builds that set `#![deny(dead_code)]`.
1469 These changes provide no direct user facing benefits, but represent significant
1470 improvements to the internals and overall performance of rustc
1473 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1475 [85200]: https://github.com/rust-lang/rust/pull/85200/
1476 [86191]: https://github.com/rust-lang/rust/pull/86191/
1477 [87220]: https://github.com/rust-lang/rust/pull/87220/
1478 [87260]: https://github.com/rust-lang/rust/pull/87260/
1479 [88321]: https://github.com/rust-lang/rust/pull/88321/
1480 [88529]: https://github.com/rust-lang/rust/pull/88529/
1481 [88690]: https://github.com/rust-lang/rust/pull/88690/
1482 [88952]: https://github.com/rust-lang/rust/pull/88952/
1483 [89337]: https://github.com/rust-lang/rust/pull/89337/
1484 [89507]: https://github.com/rust-lang/rust/pull/89507/
1485 [89508]: https://github.com/rust-lang/rust/pull/89508/
1486 [89582]: https://github.com/rust-lang/rust/pull/89582/
1487 [89597]: https://github.com/rust-lang/rust/pull/89597/
1488 [89614]: https://github.com/rust-lang/rust/pull/89614/
1489 [89692]: https://github.com/rust-lang/rust/issues/89692/
1490 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1491 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1492 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1493 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1494 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1495 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1496 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1497 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1498 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1499 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1500 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1501 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1502 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1503 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1504 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1505 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1506 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1507 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1508 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1509 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1510 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1512 Version 1.56.1 (2021-11-01)
1513 ===========================
1515 - New lints to detect the presence of bidirectional-override Unicode
1516 codepoints in the compiled source code ([CVE-2021-42574])
1518 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1520 Version 1.56.0 (2021-10-21)
1521 ========================
1526 - [The 2021 Edition is now stable.][rust#88100]
1527 See [the edition guide][rust-2021-edition-guide] for more details.
1528 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1529 - [Union field access is permitted in `const fn`.][rust#85769]
1531 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1536 - [Upgrade to LLVM 13.][rust#87570]
1537 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1538 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1539 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1540 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1541 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1542 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1543 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1545 \* Refer to Rust's [platform support page][platform-support-doc] for more
1546 information on Rust's tiered platform support.
1551 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1552 The Windows console still requires valid Unicode, but this change allows
1553 splitting a UTF-8 character across multiple write calls. This allows, for
1554 instance, programs that just read and write data buffers (e.g. copying a file
1555 to stdout) without regard for Unicode or character boundaries.
1556 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1557 For this use case, atomics scale much better under contention.
1558 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1559 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1560 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1561 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1562 - [Treat invalid environment variable names as non-existent.][rust#86183]
1563 Previously, the environment functions would panic if given a variable name
1564 with an internal null character or equal sign (`=`). Now, these functions will
1565 just treat such names as non-existent variables, since the OS cannot represent
1566 the existence of a variable with such a name.
1571 - [`std::os::unix::fs::chroot`]
1572 - [`UnsafeCell::raw_get`]
1573 - [`BufWriter::into_parts`]
1574 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1575 These APIs were previously stable in `std`, but are now also available in `core`.
1576 - [`Vec::shrink_to`]
1577 - [`String::shrink_to`]
1578 - [`OsString::shrink_to`]
1579 - [`PathBuf::shrink_to`]
1580 - [`BinaryHeap::shrink_to`]
1581 - [`VecDeque::shrink_to`]
1582 - [`HashMap::shrink_to`]
1583 - [`HashSet::shrink_to`]
1585 These APIs are now usable in const contexts:
1587 - [`std::mem::transmute`]
1588 - [`[T]::first`][`slice::first`]
1589 - [`[T]::split_first`][`slice::split_first`]
1590 - [`[T]::last`][`slice::last`]
1591 - [`[T]::split_last`][`slice::split_last`]
1596 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1597 This has no effect at present on dependency version selection.
1598 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1599 that support Rust code to include a crate's specified minimum version in the test matrix for that
1605 - [Update to new argument parsing rules on Windows.][rust#87580]
1606 This adjusts Rust's standard library to match the behavior of the standard
1607 libraries for C/C++. The rules have changed slightly over time, and this PR
1608 brings us to the latest set of rules (changed in 2008).
1609 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1610 This was already not supported by LLVM; this change surfaces this lack of
1611 support with a better error message.
1612 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1613 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1614 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1615 may return different values on glibc <= 2.24.][rust#81825]
1616 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1617 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1618 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1619 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1623 These changes provide no direct user facing benefits, but represent significant
1624 improvements to the internals and overall performance of rustc
1627 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1628 This improves the performance of most Rust builds.
1629 - [Unify representation of macros in internal data structures.][rust#88019]
1630 This change fixes a host of bugs with the handling of macros by the compiler,
1633 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1634 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1635 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1636 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1637 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1638 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1639 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1640 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1641 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1642 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1643 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1644 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1645 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1646 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1647 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1648 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1649 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1650 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1651 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1652 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1653 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1654 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1655 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1656 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1657 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1658 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1659 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1660 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1661 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1662 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1663 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1664 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1665 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1666 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1667 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1668 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1669 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1670 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1671 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1672 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1673 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1674 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1676 Version 1.55.0 (2021-09-09)
1677 ============================
1681 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1682 will end at the maximum value of the integer.][83918]
1683 - [You can now explicitly import the prelude of different editions
1684 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1688 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1690 \* Refer to Rust's [platform support page][platform-support-doc] for more
1691 information on Rust's tiered platform support.
1696 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1697 These improvements should in general provide faster string parsing of floats,
1698 no longer reject certain valid floating point values, and reduce
1699 the produced code size for non-stripped artifacts.
1700 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1707 - [`IntoInnerError::into_error`]
1708 - [`IntoInnerError::into_parts`]
1709 - [`MaybeUninit::assume_init_mut`]
1710 - [`MaybeUninit::assume_init_ref`]
1711 - [`MaybeUninit::write`]
1713 - [`ops::ControlFlow`]
1715 - [`x86::_bittestandcomplement`]
1716 - [`x86::_bittestandreset`]
1717 - [`x86::_bittestandset`]
1718 - [`x86_64::_bittest64`]
1719 - [`x86_64::_bittestandcomplement64`]
1720 - [`x86_64::_bittestandreset64`]
1721 - [`x86_64::_bittestandset64`]
1723 The following previously stable functions are now `const`.
1725 - [`str::from_utf8_unchecked`]
1730 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1731 rustc in parallel such as when using `cargo test`.][cargo/9675]
1732 - [The package definition in `cargo metadata` now includes the `"default_run"`
1733 field from the manifest.][cargo/9550]
1734 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1735 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1736 of packages.][cargo/9663]
1740 - [Added "Go to item on exact match" search option.][85876]
1741 - [The "Implementors" section on traits no longer shows redundant
1742 method definitions.][85970]
1743 - [Trait implementations are toggled open by default.][86260] This should make the
1744 implementations more searchable by tools like `CTRL+F` in your browser.
1745 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1746 through type aliases.][86334]
1747 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1748 "Trait Implementations" section.][86513]
1753 - [std functions that return an `io::Error` will no longer use the
1754 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1755 kinds of errors could be categorised [into newer more specific `ErrorKind`
1756 variants][79965], and that they do not represent a user error.
1757 - [Using environment variable names with `process::Command` on Windows now
1758 behaves as expected.][85270] Previously using envionment variables with
1759 `Command` would cause them to be ASCII-uppercased.
1760 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1761 with `rustdoc::`][86849]
1762 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1763 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1764 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1767 [86849]: https://github.com/rust-lang/rust/pull/86849
1768 [86513]: https://github.com/rust-lang/rust/pull/86513
1769 [86334]: https://github.com/rust-lang/rust/pull/86334
1770 [86260]: https://github.com/rust-lang/rust/pull/86260
1771 [85970]: https://github.com/rust-lang/rust/pull/85970
1772 [85876]: https://github.com/rust-lang/rust/pull/85876
1773 [83572]: https://github.com/rust-lang/rust/pull/83572
1774 [86294]: https://github.com/rust-lang/rust/pull/86294
1775 [86858]: https://github.com/rust-lang/rust/pull/86858
1776 [86761]: https://github.com/rust-lang/rust/pull/86761
1777 [85746]: https://github.com/rust-lang/rust/pull/85746
1778 [85270]: https://github.com/rust-lang/rust/pull/85270
1779 [83918]: https://github.com/rust-lang/rust/pull/83918
1780 [79965]: https://github.com/rust-lang/rust/pull/79965
1781 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1782 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1783 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1784 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1785 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1786 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1787 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1788 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1789 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1790 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1791 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1792 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1793 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1794 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1795 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1796 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1797 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1798 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1799 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1800 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1801 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1802 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1805 Version 1.54.0 (2021-07-29)
1806 ============================
1809 -----------------------
1811 - [You can now use macros for values in some built-in attributes.][83366]
1812 This primarily allows you to call macros within the `#[doc]` attribute. For
1813 example, to include external documentation in your crate, you can now write
1816 #![doc = include_str!("README.md")]
1819 - [You can now cast between unsized slice types (and types which contain
1820 unsized slices) in `const fn`.][85078]
1821 - [You can now use multiple generic lifetimes with `impl Trait` where the
1822 lifetimes don't explicitly outlive another.][84701] In code this means
1823 that you can now have `impl Trait<'a, 'b>` where as before you could
1824 only have `impl Trait<'a, 'b> where 'b: 'a`.
1827 -----------------------
1829 - [Rustc will now search for custom JSON targets in
1830 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1831 directory.][83800] You can find your sysroot directory by running
1832 `rustc --print sysroot`.
1833 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1834 - [You can now use `#[target_feature]` on safe functions when targeting
1835 WebAssembly platforms.][84988]
1836 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1837 - [Added tier 3\* support for `bpfel-unknown-none`
1838 and `bpfeb-unknown-none`.][79608]
1839 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1841 \* Refer to Rust's [platform support page][platform-support-doc] for more
1842 information on Rust's tiered platform support.
1845 -----------------------
1847 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1848 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1849 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1850 - [The implementations of vendor intrinsics in core::arch have been
1851 significantly refactored.][83278] The main user-visible changes are
1852 a 50% reduction in the size of libcore.rlib and stricter validation
1853 of constant operands passed to intrinsics. The latter is technically
1854 a breaking change, but allows Rust to more closely match the C vendor
1860 - [`BTreeMap::into_keys`]
1861 - [`BTreeMap::into_values`]
1862 - [`HashMap::into_keys`]
1863 - [`HashMap::into_values`]
1865 - [`VecDeque::binary_search`]
1866 - [`VecDeque::binary_search_by`]
1867 - [`VecDeque::binary_search_by_key`]
1868 - [`VecDeque::partition_point`]
1873 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1874 the dependency graph.][cargo/9520]
1875 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1876 in the tree ][cargo/9499]
1877 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1878 macro dependencies.][cargo/9488]
1879 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1880 This variable points to a directory that integration tests and benches
1881 can use as a "scratchpad" for testing filesystem operations.
1885 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1886 - [Previously unsound code is no longer permitted where different constructors in branches
1887 could require different lifetimes.][85574]
1888 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1889 than before and may reject some previously accepted code.
1890 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1891 when compiled with `codegen-units = 1`.][86063]
1893 [85574]: https://github.com/rust-lang/rust/issues/85574
1894 [86831]: https://github.com/rust-lang/rust/issues/86831
1895 [86063]: https://github.com/rust-lang/rust/issues/86063
1896 [79608]: https://github.com/rust-lang/rust/pull/79608
1897 [84988]: https://github.com/rust-lang/rust/pull/84988
1898 [84701]: https://github.com/rust-lang/rust/pull/84701
1899 [84072]: https://github.com/rust-lang/rust/pull/84072
1900 [85745]: https://github.com/rust-lang/rust/pull/85745
1901 [84744]: https://github.com/rust-lang/rust/pull/84744
1902 [85078]: https://github.com/rust-lang/rust/pull/85078
1903 [84717]: https://github.com/rust-lang/rust/pull/84717
1904 [83800]: https://github.com/rust-lang/rust/pull/83800
1905 [83366]: https://github.com/rust-lang/rust/pull/83366
1906 [83278]: https://github.com/rust-lang/rust/pull/83278
1907 [85292]: https://github.com/rust-lang/rust/pull/85292
1908 [82834]: https://github.com/rust-lang/rust/pull/82834
1909 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1910 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1911 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1912 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1913 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1914 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1915 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1916 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1917 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1918 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1919 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1921 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1923 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1925 Version 1.53.0 (2021-06-17)
1926 ============================
1929 -----------------------
1930 - [You can now use unicode for identifiers.][83799] This allows multilingual
1931 identifiers but still doesn't allow glyphs that are not considered characters
1932 such as `◆` or `🦀`. More specifically you can now use any identifier that
1933 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1934 is the same standard as languages like Python, however Rust uses NFC
1935 normalization which may be different from other languages.
1936 - [You can now specify "or patterns" inside pattern matches.][79278]
1937 Previously you could only use `|` (OR) on complete patterns. E.g.
1941 matches!(x, Some(1) | Some(2));
1943 matches!(x, Some(1 | 2));
1945 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1946 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1947 to change semantics to being a pattern fragment in a future edition.
1950 -----------------------
1951 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1952 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1953 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1955 \* Refer to Rust's [platform support page][platform-support-doc] for more
1956 information on Rust's tiered platform support.
1959 -----------------------
1960 - [Abort messages will now forward to `android_set_abort_message` on
1961 Android platforms when available.][81469]
1962 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1963 - [Arrays of any length now implement `IntoIterator`.][84147]
1964 Currently calling `.into_iter()` as a method on an array will
1965 return `impl Iterator<Item=&T>`, but this may change in a
1966 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1967 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1968 - [`leading_zeros`, and `trailing_zeros` are now available on all
1969 `NonZero` integer types.][84082]
1970 - [`{f32, f64}::from_str` now parse and print special values
1971 (`NaN`, `-0`) according to IEEE 754.][78618]
1972 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1973 - [Add the `BITS` associated constant to all numeric types.][82565]
1977 - [`AtomicBool::fetch_update`]
1978 - [`AtomicPtr::fetch_update`]
1979 - [`BTreeMap::retain`]
1980 - [`BTreeSet::retain`]
1981 - [`BufReader::seek_relative`]
1982 - [`DebugStruct::non_exhaustive`]
1984 - [`Duration::ZERO`]
1985 - [`Duration::is_zero`]
1986 - [`Duration::saturating_add`]
1987 - [`Duration::saturating_mul`]
1988 - [`Duration::saturating_sub`]
1989 - [`ErrorKind::Unsupported`]
1990 - [`Option::insert`]
1991 - [`Ordering::is_eq`]
1992 - [`Ordering::is_ge`]
1993 - [`Ordering::is_gt`]
1994 - [`Ordering::is_le`]
1995 - [`Ordering::is_lt`]
1996 - [`Ordering::is_ne`]
1997 - [`OsStr::is_ascii`]
1998 - [`OsStr::make_ascii_lowercase`]
1999 - [`OsStr::make_ascii_uppercase`]
2000 - [`OsStr::to_ascii_lowercase`]
2001 - [`OsStr::to_ascii_uppercase`]
2002 - [`Peekable::peek_mut`]
2003 - [`Rc::decrement_strong_count`]
2004 - [`Rc::increment_strong_count`]
2005 - [`Vec::extend_from_within`]
2006 - [`array::from_mut`]
2007 - [`array::from_ref`]
2008 - [`cmp::max_by_key`]
2010 - [`cmp::min_by_key`]
2012 - [`f32::is_subnormal`]
2013 - [`f64::is_subnormal`]
2016 -----------------------
2017 - [Cargo now supports git repositories where the default `HEAD` branch is not
2018 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
2019 which can handle default branches correctly.
2020 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
2021 - [The `authors` field is no longer included in `Cargo.toml` for new
2022 projects.][cargo/9282]
2025 -----------------------
2026 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
2027 without hyperlinks.][81764]
2031 - [Implement token-based handling of attributes during expansion][82608]
2032 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
2033 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
2034 to confusion and potential security vulnerabilities and [is no
2035 longer recommended][ietf6943].
2036 - [The added `BITS` constant may conflict with external definitions.][85667]
2037 In particular, this was known to be a problem in the `lexical-core` crate,
2038 but they have published fixes for semantic versions 0.4 through 0.7. To
2039 update this dependency alone, use `cargo update -p lexical-core`.
2040 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
2044 These changes provide no direct user facing benefits, but represent significant
2045 improvements to the internals and overall performance of rustc and
2048 - [Rework the `std::sys::windows::alloc` implementation.][83065]
2049 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
2050 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
2051 - [Rework rustdoc const type][82873]
2053 [85667]: https://github.com/rust-lang/rust/pull/85667
2054 [83386]: https://github.com/rust-lang/rust/pull/83386
2055 [82771]: https://github.com/rust-lang/rust/pull/82771
2056 [84147]: https://github.com/rust-lang/rust/pull/84147
2057 [84082]: https://github.com/rust-lang/rust/pull/84082
2058 [83799]: https://github.com/rust-lang/rust/pull/83799
2059 [83681]: https://github.com/rust-lang/rust/pull/83681
2060 [83652]: https://github.com/rust-lang/rust/pull/83652
2061 [83387]: https://github.com/rust-lang/rust/pull/83387
2062 [82873]: https://github.com/rust-lang/rust/pull/82873
2063 [82864]: https://github.com/rust-lang/rust/pull/82864
2064 [82608]: https://github.com/rust-lang/rust/pull/82608
2065 [82565]: https://github.com/rust-lang/rust/pull/82565
2066 [80525]: https://github.com/rust-lang/rust/pull/80525
2067 [79278]: https://github.com/rust-lang/rust/pull/79278
2068 [78618]: https://github.com/rust-lang/rust/pull/78618
2069 [77704]: https://github.com/rust-lang/rust/pull/77704
2070 [83941]: https://github.com/rust-lang/rust/pull/83941
2071 [83065]: https://github.com/rust-lang/rust/pull/83065
2072 [81764]: https://github.com/rust-lang/rust/pull/81764
2073 [81469]: https://github.com/rust-lang/rust/pull/81469
2074 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
2075 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
2076 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
2077 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
2078 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
2079 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
2080 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
2081 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
2082 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
2083 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
2084 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
2085 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
2086 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
2087 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
2088 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
2089 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
2090 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
2091 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
2092 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
2093 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
2094 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
2095 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
2096 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
2097 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
2098 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
2099 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
2100 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
2101 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
2102 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
2103 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
2104 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
2105 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
2106 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
2107 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
2108 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
2109 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
2110 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
2111 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
2112 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
2113 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
2114 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
2117 Version 1.52.1 (2021-05-10)
2118 ============================
2120 This release disables incremental compilation, unless the user has explicitly
2121 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
2123 This is due to the widespread, and frequently occurring, breakage encountered by
2124 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
2125 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
2126 newly added incremental verification are still present in past stable versions,
2127 and are not yet fixed on any channel. These bugs can lead to miscompilation of
2130 These problems only affect incremental builds, so release builds with Cargo
2131 should not be affected unless the user has explicitly opted into incremental.
2132 Debug and check builds are affected.
2134 See [84970] for more details.
2136 [84970]: https://github.com/rust-lang/rust/issues/84970
2138 Version 1.52.0 (2021-05-06)
2139 ============================
2143 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
2144 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
2145 is allowed by default, and may become a warning or hard error in a
2147 - [You can now cast mutable references to arrays to a pointer of the same type as
2148 the element.][81479]
2152 - [Upgraded the default LLVM to LLVM 12.][81451]
2154 Added tier 3\* support for the following targets.
2156 - [`s390x-unknown-linux-musl`][82166]
2157 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
2158 - [`powerpc-unknown-openbsd`][82733]
2160 \* Refer to Rust's [platform support page][platform-support-doc] for more
2161 information on Rust's tiered platform support.
2165 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
2166 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
2167 - [`Arc<impl Error>` now implements `error::Error`.][80553]
2168 - [All integer division and remainder operations are now `const`.][80962]
2172 - [`Arguments::as_str`]
2174 - [`char::REPLACEMENT_CHARACTER`]
2175 - [`char::UNICODE_VERSION`]
2176 - [`char::decode_utf16`]
2177 - [`char::from_digit`]
2178 - [`char::from_u32_unchecked`]
2179 - [`char::from_u32`]
2180 - [`slice::partition_point`]
2181 - [`str::rsplit_once`]
2182 - [`str::split_once`]
2184 The following previously stable APIs are now `const`.
2186 - [`char::len_utf8`]
2187 - [`char::len_utf16`]
2188 - [`char::to_ascii_uppercase`]
2189 - [`char::to_ascii_lowercase`]
2190 - [`char::eq_ignore_ascii_case`]
2191 - [`u8::to_ascii_uppercase`]
2192 - [`u8::to_ascii_lowercase`]
2193 - [`u8::eq_ignore_ascii_case`]
2197 - [Rustdoc lints are now treated as a tool lint, meaning that
2198 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
2199 Using the old style is still allowed, and will become a warning in
2201 - [Rustdoc now supports argument files.][82261]
2202 - [Rustdoc now generates smart punctuation for documentation.][79423]
2203 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
2211 - [You can now pass multiple filters to tests.][81356] E.g.
2212 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
2213 - [Rustup now distributes PDB symbols for the `std` library on Windows,
2214 allowing you to see `std` symbols when debugging.][82218]
2218 These changes provide no direct user facing benefits, but represent significant
2219 improvements to the internals and overall performance of rustc and
2222 - [Check the result cache before the DepGraph when ensuring queries][81855]
2223 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
2224 - [Only store a LocalDefId in some HIR nodes][81611]
2225 - [Store HIR attributes in a side table][79519]
2229 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
2230 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
2231 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
2232 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
2233 languages in code blocks.][78429]
2234 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
2235 - [Changes in how proc macros handle whitespace may lead to panics when used
2236 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
2237 - [Turn `#[derive]` into a regular macro attribute][79078]
2239 [84136]: https://github.com/rust-lang/rust/issues/84136
2240 [80763]: https://github.com/rust-lang/rust/pull/80763
2241 [82166]: https://github.com/rust-lang/rust/pull/82166
2242 [82121]: https://github.com/rust-lang/rust/pull/82121
2243 [81879]: https://github.com/rust-lang/rust/pull/81879
2244 [82261]: https://github.com/rust-lang/rust/pull/82261
2245 [82218]: https://github.com/rust-lang/rust/pull/82218
2246 [82216]: https://github.com/rust-lang/rust/pull/82216
2247 [82202]: https://github.com/rust-lang/rust/pull/82202
2248 [81855]: https://github.com/rust-lang/rust/pull/81855
2249 [81766]: https://github.com/rust-lang/rust/pull/81766
2250 [81744]: https://github.com/rust-lang/rust/pull/81744
2251 [81611]: https://github.com/rust-lang/rust/pull/81611
2252 [81479]: https://github.com/rust-lang/rust/pull/81479
2253 [81451]: https://github.com/rust-lang/rust/pull/81451
2254 [81356]: https://github.com/rust-lang/rust/pull/81356
2255 [80962]: https://github.com/rust-lang/rust/pull/80962
2256 [80553]: https://github.com/rust-lang/rust/pull/80553
2257 [80527]: https://github.com/rust-lang/rust/pull/80527
2258 [79519]: https://github.com/rust-lang/rust/pull/79519
2259 [79423]: https://github.com/rust-lang/rust/pull/79423
2260 [79208]: https://github.com/rust-lang/rust/pull/79208
2261 [78429]: https://github.com/rust-lang/rust/pull/78429
2262 [82733]: https://github.com/rust-lang/rust/pull/82733
2263 [82594]: https://github.com/rust-lang/rust/pull/82594
2264 [79078]: https://github.com/rust-lang/rust/pull/79078
2265 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
2266 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
2267 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
2268 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
2269 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
2270 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
2271 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
2272 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
2273 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
2274 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
2275 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
2276 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
2277 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
2278 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
2279 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
2280 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
2281 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
2282 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
2283 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
2284 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
2285 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
2286 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
2288 Version 1.51.0 (2021-03-25)
2289 ============================
2293 - [You can now parameterize items such as functions, traits, and `struct`s by constant
2294 values in addition to by types and lifetimes.][79135] Also known as "const generics"
2295 E.g. you can now write the following. Note: Only values of primitive integers,
2296 `bool`, or `char` types are currently permitted.
2298 struct GenericArray<T, const LENGTH: usize> {
2302 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2303 const fn last(&self) -> Option<&T> {
2307 Some(&self.inner[LENGTH - 1])
2317 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2318 This option controls whether debug information is split across multiple files
2319 or packed into a single file. **Note** This option is unstable on other platforms.
2320 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2321 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2322 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2323 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2325 \* Refer to Rust's [platform support page][platform-support-doc] for more
2326 information on Rust's tiered platform support.
2331 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2332 - [`str` now implements `AsMut<str>`.][80279]
2333 - [`u64` and `u128` now implement `From<char>`.][79502]
2334 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2335 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2336 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2337 - [`io::Empty` now implements `io::Seek`.][78044]
2338 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2339 `T: ?Sized` types.][80764]
2340 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2346 - [`Arc::decrement_strong_count`]
2347 - [`Arc::increment_strong_count`]
2348 - [`Once::call_once_force`]
2349 - [`Peekable::next_if_eq`]
2350 - [`Peekable::next_if`]
2351 - [`Seek::stream_position`]
2352 - [`array::IntoIter`]
2353 - [`panic::panic_any`]
2355 - [`ptr::addr_of_mut!`]
2356 - [`slice::fill_with`]
2357 - [`slice::split_inclusive_mut`]
2358 - [`slice::split_inclusive`]
2359 - [`slice::strip_prefix`]
2360 - [`slice::strip_suffix`]
2361 - [`str::split_inclusive`]
2362 - [`sync::OnceState`]
2364 - [`VecDeque::range`]
2365 - [`VecDeque::range_mut`]
2369 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2370 codegen option.][cargo/9112]
2371 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2372 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2373 to avoid unifying features of dependencies where that unification could be unwanted.
2374 Such as using the same dependency with a `std` feature in a build scripts and
2375 proc-macros, while using the `no-std` feature in the final binary. See the
2376 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2381 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2382 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2383 documentation.][79642]
2385 Various improvements to intra-doc links:
2387 - [You can link to non-path primitives such as `slice`.][80181]
2388 - [You can link to associated items.][74489]
2389 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2393 - [You can now pass `--include-ignored` to tests (e.g. with
2394 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2399 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2400 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2402 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2403 for the distributed artifacts.][81521]
2404 - `armv5te-unknown-linux-gnueabi`
2405 - `sparc64-unknown-linux-gnu`
2406 - `thumbv7neon-unknown-linux-gnueabihf`
2407 - `armv7-unknown-linux-gnueabi`
2408 - `x86_64-unknown-linux-gnux32`
2409 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2414 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2416 [79135]: https://github.com/rust-lang/rust/pull/79135
2417 [74489]: https://github.com/rust-lang/rust/pull/74489
2418 [76934]: https://github.com/rust-lang/rust/pull/76934
2419 [79570]: https://github.com/rust-lang/rust/pull/79570
2420 [80181]: https://github.com/rust-lang/rust/pull/80181
2421 [79642]: https://github.com/rust-lang/rust/pull/79642
2422 [80945]: https://github.com/rust-lang/rust/pull/80945
2423 [80279]: https://github.com/rust-lang/rust/pull/80279
2424 [80053]: https://github.com/rust-lang/rust/pull/80053
2425 [79502]: https://github.com/rust-lang/rust/pull/79502
2426 [75180]: https://github.com/rust-lang/rust/pull/75180
2427 [81521]: https://github.com/rust-lang/rust/pull/81521
2428 [80968]: https://github.com/rust-lang/rust/pull/80968
2429 [80959]: https://github.com/rust-lang/rust/pull/80959
2430 [80718]: https://github.com/rust-lang/rust/pull/80718
2431 [80653]: https://github.com/rust-lang/rust/pull/80653
2432 [80579]: https://github.com/rust-lang/rust/pull/80579
2433 [79998]: https://github.com/rust-lang/rust/pull/79998
2434 [78044]: https://github.com/rust-lang/rust/pull/78044
2435 [81455]: https://github.com/rust-lang/rust/pull/81455
2436 [80764]: https://github.com/rust-lang/rust/pull/80764
2437 [80749]: https://github.com/rust-lang/rust/pull/80749
2438 [80662]: https://github.com/rust-lang/rust/pull/80662
2439 [79134]: https://github.com/rust-lang/rust/pull/79134
2440 [80966]: https://github.com/rust-lang/rust/pull/80966
2441 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2442 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2443 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2444 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2445 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2446 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2447 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2448 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2449 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2450 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2451 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2452 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2453 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2454 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2455 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2456 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2457 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2458 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2459 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2460 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2461 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2462 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2463 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2465 Version 1.50.0 (2021-02-11)
2466 ============================
2469 -----------------------
2470 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2471 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2472 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2475 -----------------------
2476 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2477 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2478 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2479 - [Dropped support for all cloudabi targets.][78439]
2481 \* Refer to Rust's [platform support page][platform-support-doc] for more
2482 information on Rust's tiered platform support.
2485 -----------------------
2487 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2488 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2489 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2490 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2491 up the same amount of space as `File`.
2497 - [`btree_map::Entry::or_insert_with_key`]
2500 - [`hash_map::Entry::or_insert_with_key`]
2504 - [`UnsafeCell::get_mut`]
2506 The following previously stable methods are now `const`.
2508 - [`IpAddr::is_ipv4`]
2509 - [`IpAddr::is_ipv6`]
2510 - [`IpAddr::is_unspecified`]
2511 - [`IpAddr::is_loopback`]
2512 - [`IpAddr::is_multicast`]
2513 - [`Ipv4Addr::octets`]
2514 - [`Ipv4Addr::is_loopback`]
2515 - [`Ipv4Addr::is_private`]
2516 - [`Ipv4Addr::is_link_local`]
2517 - [`Ipv4Addr::is_multicast`]
2518 - [`Ipv4Addr::is_broadcast`]
2519 - [`Ipv4Addr::is_documentation`]
2520 - [`Ipv4Addr::to_ipv6_compatible`]
2521 - [`Ipv4Addr::to_ipv6_mapped`]
2522 - [`Ipv6Addr::segments`]
2523 - [`Ipv6Addr::is_unspecified`]
2524 - [`Ipv6Addr::is_loopback`]
2525 - [`Ipv6Addr::is_multicast`]
2526 - [`Ipv6Addr::to_ipv4`]
2529 - [`Layout::from_size_align`]
2530 - `pow` for all integer types.
2531 - `checked_pow` for all integer types.
2532 - `saturating_pow` for all integer types.
2533 - `wrapping_pow` for all integer types.
2534 - `next_power_of_two` for all unsigned integer types.
2535 - `checked_next_power_of_two` for all unsigned integer types.
2538 -----------------------
2540 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2541 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2542 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2543 contents of that directory for changes.][cargo/8973]
2544 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2549 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2550 - [Running tests will now print the total time taken to execute.][75752]
2555 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2556 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2557 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2558 unhygenic `macro_rules!` macros.][79472]
2559 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2560 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2561 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2562 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2563 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2564 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2566 [74989]: https://github.com/rust-lang/rust/pull/74989
2567 [79261]: https://github.com/rust-lang/rust/pull/79261
2568 [79896]: https://github.com/rust-lang/rust/pull/79896
2569 [79484]: https://github.com/rust-lang/rust/pull/79484
2570 [79472]: https://github.com/rust-lang/rust/pull/79472
2571 [79270]: https://github.com/rust-lang/rust/pull/79270
2572 [79003]: https://github.com/rust-lang/rust/pull/79003
2573 [78864]: https://github.com/rust-lang/rust/pull/78864
2574 [78636]: https://github.com/rust-lang/rust/pull/78636
2575 [78439]: https://github.com/rust-lang/rust/pull/78439
2576 [78343]: https://github.com/rust-lang/rust/pull/78343
2577 [78296]: https://github.com/rust-lang/rust/pull/78296
2578 [78068]: https://github.com/rust-lang/rust/pull/78068
2579 [75752]: https://github.com/rust-lang/rust/pull/75752
2580 [74699]: https://github.com/rust-lang/rust/pull/74699
2581 [78142]: https://github.com/rust-lang/rust/pull/78142
2582 [77484]: https://github.com/rust-lang/rust/pull/77484
2583 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2584 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2585 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2586 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2587 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2588 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2589 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2590 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2591 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2592 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2593 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2594 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2595 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2596 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2597 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2598 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2599 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2600 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2601 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2602 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2603 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2604 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2605 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2606 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2607 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2608 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2609 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2610 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2611 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2612 [`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
2613 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2614 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2615 [`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
2616 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2619 Version 1.49.0 (2020-12-31)
2620 ============================
2623 -----------------------
2625 - [Unions can now implement `Drop`, and you can now have a field in a union
2626 with `ManuallyDrop<T>`.][77547]
2627 - [You can now cast uninhabited enums to integers.][76199]
2628 - [You can now bind by reference and by move in patterns.][76119] This
2629 allows you to selectively borrow individual components of a type. E.g.
2637 let person = Person {
2638 name: String::from("Alice"),
2642 // `name` is moved out of person, but `age` is referenced.
2643 let Person { name, ref age } = person;
2644 println!("{} {}", name, age);
2648 -----------------------
2650 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2651 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2652 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2653 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2654 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2655 - [Output from threads spawned in tests is now captured.][78227]
2656 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2658 \* Refer to Rust's [platform support page][platform-support-doc] for more
2659 information on Rust's tiered platform support.
2662 -----------------------
2664 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2665 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2670 - [`slice::select_nth_unstable`]
2671 - [`slice::select_nth_unstable_by`]
2672 - [`slice::select_nth_unstable_by_key`]
2674 The following previously stable methods are now `const`.
2676 - [`Poll::is_ready`]
2677 - [`Poll::is_pending`]
2680 -----------------------
2681 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2682 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2683 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2684 variable will be set if the crate being built is one the user selected to build, either
2685 with `-p` or through defaults.
2686 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2692 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2693 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2694 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2695 Previously such invalid or unused attributes could be ignored.
2696 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2697 read [this post about the changes][rustdoc-ws-post] for more details.
2698 - [Trait bounds are no longer inferred for associated types.][79904]
2702 These changes provide no direct user facing benefits, but represent significant
2703 improvements to the internals and overall performance of rustc and
2706 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2707 Local Storage model.][78201]
2708 - [Calculate visibilities once in resolve.][78077]
2709 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2710 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2713 [75991]: https://github.com/rust-lang/rust/pull/75991
2714 [78951]: https://github.com/rust-lang/rust/pull/78951
2715 [78848]: https://github.com/rust-lang/rust/pull/78848
2716 [78746]: https://github.com/rust-lang/rust/pull/78746
2717 [78376]: https://github.com/rust-lang/rust/pull/78376
2718 [78228]: https://github.com/rust-lang/rust/pull/78228
2719 [78227]: https://github.com/rust-lang/rust/pull/78227
2720 [78201]: https://github.com/rust-lang/rust/pull/78201
2721 [78109]: https://github.com/rust-lang/rust/pull/78109
2722 [78077]: https://github.com/rust-lang/rust/pull/78077
2723 [77997]: https://github.com/rust-lang/rust/pull/77997
2724 [77703]: https://github.com/rust-lang/rust/pull/77703
2725 [77547]: https://github.com/rust-lang/rust/pull/77547
2726 [77015]: https://github.com/rust-lang/rust/pull/77015
2727 [76199]: https://github.com/rust-lang/rust/pull/76199
2728 [76119]: https://github.com/rust-lang/rust/pull/76119
2729 [75914]: https://github.com/rust-lang/rust/pull/75914
2730 [79004]: https://github.com/rust-lang/rust/pull/79004
2731 [78676]: https://github.com/rust-lang/rust/pull/78676
2732 [79904]: https://github.com/rust-lang/rust/issues/79904
2733 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2734 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2735 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2736 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2737 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2738 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2739 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2740 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2741 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2742 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2744 Version 1.48.0 (2020-11-19)
2745 ==========================
2750 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2751 is still rejected *semantically*, but can now be parsed by procedural macros.
2755 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2756 `rustc` whether to link its own C runtime and libraries or to rely on a external
2757 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2758 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2759 Note: If you're using cargo you must explicitly pass the `--target` flag.
2760 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2762 \* Refer to Rust's [platform support page][platform-support-doc] for more
2763 information on Rust's tiered platform support.
2767 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2768 and `&Stderr`.][76275]
2769 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2770 - [The `matches!` macro now supports having a trailing comma.][74880]
2771 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2772 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2776 - [`slice::as_ptr_range`]
2777 - [`slice::as_mut_ptr_range`]
2778 - [`VecDeque::make_contiguous`]
2779 - [`future::pending`]
2782 The following previously stable methods are now `const fn`'s:
2784 - [`Option::is_some`]
2785 - [`Option::is_none`]
2786 - [`Option::as_ref`]
2788 - [`Result::is_err`]
2789 - [`Result::as_ref`]
2790 - [`Ordering::reverse`]
2791 - [`Ordering::then`]
2798 - [You can now link to items in `rustdoc` using the intra-doc link
2799 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2800 a link to `std::future`'s documentation. See ["Linking to items by
2801 name"][intradoc-links] for more information.
2802 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2803 when searching through `rustdoc`'s UI.][75740]
2807 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2808 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2809 promoted to `'static` lifetime any more inside `const fn`s.
2810 - [Associated type bindings on trait objects are now verified to meet the bounds
2811 declared on the trait when checking that they implement the trait.][27675]
2812 - [When trait bounds on associated types or opaque types are ambiguous, the
2813 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2814 - [Fixed recursive nonterminals not being expanded in macros during
2815 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2816 correctly handling recursive nonterminal tokens.
2817 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2818 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2819 in places where they have no effect.][73461]
2820 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2821 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2822 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2823 disallow zero-initialization.][71274]
2824 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2825 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2826 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2827 see the [`catch_unwind`] documentation for further information.
2833 These changes provide no direct user facing benefits, but represent significant
2834 improvements to the internals and overall performance of rustc and
2837 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2838 You can continue building with `make` by setting `ninja=false` in
2840 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2841 - [Made `ensure_sufficient_stack()` non-generic][76680]
2843 [78143]: https://github.com/rust-lang/rust/issues/78143
2844 [76680]: https://github.com/rust-lang/rust/pull/76680/
2845 [76030]: https://github.com/rust-lang/rust/pull/76030/
2846 [70212]: https://github.com/rust-lang/rust/pull/70212/
2847 [27675]: https://github.com/rust-lang/rust/issues/27675/
2848 [54121]: https://github.com/rust-lang/rust/issues/54121/
2849 [71274]: https://github.com/rust-lang/rust/pull/71274/
2850 [77386]: https://github.com/rust-lang/rust/pull/77386/
2851 [77153]: https://github.com/rust-lang/rust/pull/77153/
2852 [77055]: https://github.com/rust-lang/rust/pull/77055/
2853 [76275]: https://github.com/rust-lang/rust/pull/76275/
2854 [76310]: https://github.com/rust-lang/rust/pull/76310/
2855 [76420]: https://github.com/rust-lang/rust/pull/76420/
2856 [76158]: https://github.com/rust-lang/rust/pull/76158/
2857 [75857]: https://github.com/rust-lang/rust/pull/75857/
2858 [75585]: https://github.com/rust-lang/rust/pull/75585/
2859 [75740]: https://github.com/rust-lang/rust/pull/75740/
2860 [75502]: https://github.com/rust-lang/rust/pull/75502/
2861 [74880]: https://github.com/rust-lang/rust/pull/74880/
2862 [74922]: https://github.com/rust-lang/rust/pull/74922/
2863 [74430]: https://github.com/rust-lang/rust/pull/74430/
2864 [74194]: https://github.com/rust-lang/rust/pull/74194/
2865 [73461]: https://github.com/rust-lang/rust/pull/73461/
2866 [73166]: https://github.com/rust-lang/rust/pull/73166/
2867 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2868 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2869 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2870 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2871 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2872 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2873 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2874 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2875 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2876 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2877 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2878 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2879 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2880 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2881 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2884 Version 1.47.0 (2020-10-08)
2885 ==========================
2889 - [Closures will now warn when not used.][74869]
2893 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2894 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2896 - [Upgraded to LLVM 11.][73526]
2897 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2898 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2899 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2901 \* Refer to Rust's [platform support page][platform-support-doc] for more
2902 information on Rust's tiered platform support.
2906 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2907 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2908 those of length less than 33.][74060]
2909 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2910 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2911 `PartialEq`, and `PartialOrd`.][73583]
2915 - [`Ident::new_raw`]
2916 - [`Range::is_empty`]
2917 - [`RangeInclusive::is_empty`]
2918 - [`Result::as_deref`]
2919 - [`Result::as_deref_mut`]
2921 - [`pointer::offset_from`]
2925 The following previously stable APIs have now been made const.
2927 - [The `new` method for all `NonZero` integers.][73858]
2928 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2929 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2930 methods for all integers.][73858]
2931 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2932 signed integers.][73858]
2933 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2934 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2935 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2936 `is_ascii_control` methods for `char` and `u8`.][73858]
2940 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2941 You can override this by setting the following in your `Cargo.toml`.
2943 [profile.release.build-override]
2946 - [`cargo-help` will now display man pages for commands rather just the
2947 `--help` text.][cargo/8456]
2948 - [`cargo-metadata` now emits a `test` field indicating if a target has
2949 tests enabled.][cargo/8478]
2950 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2951 - [`cargo-publish` will now use an alternative registry by default if it's the
2952 only registry specified in `package.publish`.][cargo/8571]
2956 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2957 type based search.][75366]
2958 - [Added the Ayu theme to rustdoc.][71237]
2962 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2963 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2964 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2965 help to preserve more span information.][73084] These changes may cause
2966 compilation errors if your macro was unhygenic or didn't correctly handle
2968 - [Moved support for the CloudABI target to tier 3.][75568]
2969 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2970 - [Added the `rustc-docs` component.][75560] This allows you to install
2971 and read the documentation for the compiler internal APIs. (Currently only
2972 available for `x86_64-unknown-linux-gnu`.)
2977 - [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.
2979 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2980 [75048]: https://github.com/rust-lang/rust/pull/75048/
2981 [74163]: https://github.com/rust-lang/rust/pull/74163/
2982 [71237]: https://github.com/rust-lang/rust/pull/71237/
2983 [74869]: https://github.com/rust-lang/rust/pull/74869/
2984 [73858]: https://github.com/rust-lang/rust/pull/73858/
2985 [75716]: https://github.com/rust-lang/rust/pull/75716/
2986 [75560]: https://github.com/rust-lang/rust/pull/75560/
2987 [75568]: https://github.com/rust-lang/rust/pull/75568/
2988 [75366]: https://github.com/rust-lang/rust/pull/75366/
2989 [75204]: https://github.com/rust-lang/rust/pull/75204/
2990 [74650]: https://github.com/rust-lang/rust/pull/74650/
2991 [74419]: https://github.com/rust-lang/rust/pull/74419/
2992 [73964]: https://github.com/rust-lang/rust/pull/73964/
2993 [74021]: https://github.com/rust-lang/rust/pull/74021/
2994 [74060]: https://github.com/rust-lang/rust/pull/74060/
2995 [73893]: https://github.com/rust-lang/rust/pull/73893/
2996 [73526]: https://github.com/rust-lang/rust/pull/73526/
2997 [73583]: https://github.com/rust-lang/rust/pull/73583/
2998 [73084]: https://github.com/rust-lang/rust/pull/73084/
2999 [73197]: https://github.com/rust-lang/rust/pull/73197/
3000 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
3001 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
3002 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
3003 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
3004 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
3005 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
3006 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
3007 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
3008 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
3009 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
3010 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
3011 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
3012 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
3013 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
3016 Version 1.46.0 (2020-08-27)
3017 ==========================
3021 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
3022 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
3023 const functions.][73862]
3024 - [The `#[track_caller]` attribute can now be added to functions to use the
3025 function's caller's location information for panic messages.][72445]
3026 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
3027 `x.0.0` over `(x.0).0`.
3028 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
3029 You currently can't use `mem::transmute` in constant functions.
3033 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
3034 - [Enabled static "Position Independent Executables" by default
3035 for `x86_64-unknown-linux-musl`.][70740]
3039 - [`mem::forget` is now a `const fn`.][73887]
3040 - [`String` now implements `From<char>`.][73466]
3041 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
3042 integer types.][73032]
3043 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
3044 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
3045 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
3046 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
3047 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
3048 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
3053 - [`vec::Drain::as_slice`]
3057 Added a number of new environment variables that are now available when
3058 compiling your crate.
3060 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
3061 the specific binary being compiled and the name of the crate.
3062 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
3063 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
3067 - [The target configuration option `abi_blacklist` has been renamed
3068 to `unsupported_abis`.][74150] The old name will still continue to work.
3069 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
3070 This was previously accepted but will become a hard error in a future release.
3071 - [Rustc will fail to compile if you have a struct with
3072 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
3074 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
3075 ensure that spans have the correct information, and may cause breakage if you
3076 were relying on receiving spans with dummy information.
3077 - [The InnoSetup installer for Windows is no longer available.][72569] This was
3078 a legacy installer that was replaced by a MSI installer a few years ago but
3079 was still being built.
3080 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
3081 - [Rustc will no longer accept overlapping trait implementations that only
3082 differ in how the lifetime was bound.][72493]
3083 - [Rustc now correctly relates the lifetime of an existential associated
3084 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
3085 you to pass a shorter lifetime than expected.
3086 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
3087 The library will need to be installed for `rustc` to work, even though we
3088 expect it to be already available on most systems.
3089 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
3091 - [Pretty printing of some tokens in procedural macros changed.][75453] The
3092 exact output returned by rustc's pretty printing is an unstable
3093 implementation detail: we recommend any macro relying on it to switch to a
3094 more robust parsing system.
3096 [75453]: https://github.com/rust-lang/rust/issues/75453/
3097 [74820]: https://github.com/rust-lang/rust/issues/74820/
3098 [74420]: https://github.com/rust-lang/rust/issues/74420/
3099 [74109]: https://github.com/rust-lang/rust/pull/74109/
3100 [74150]: https://github.com/rust-lang/rust/pull/74150/
3101 [73862]: https://github.com/rust-lang/rust/pull/73862/
3102 [73887]: https://github.com/rust-lang/rust/pull/73887/
3103 [73466]: https://github.com/rust-lang/rust/pull/73466/
3104 [73516]: https://github.com/rust-lang/rust/pull/73516/
3105 [73293]: https://github.com/rust-lang/rust/pull/73293/
3106 [73007]: https://github.com/rust-lang/rust/pull/73007/
3107 [73032]: https://github.com/rust-lang/rust/pull/73032/
3108 [72920]: https://github.com/rust-lang/rust/pull/72920/
3109 [72569]: https://github.com/rust-lang/rust/pull/72569/
3110 [72583]: https://github.com/rust-lang/rust/pull/72583/
3111 [72584]: https://github.com/rust-lang/rust/pull/72584/
3112 [72717]: https://github.com/rust-lang/rust/pull/72717/
3113 [72437]: https://github.com/rust-lang/rust/pull/72437/
3114 [72445]: https://github.com/rust-lang/rust/pull/72445/
3115 [72486]: https://github.com/rust-lang/rust/pull/72486/
3116 [72493]: https://github.com/rust-lang/rust/pull/72493/
3117 [72331]: https://github.com/rust-lang/rust/pull/72331/
3118 [71896]: https://github.com/rust-lang/rust/pull/71896/
3119 [71660]: https://github.com/rust-lang/rust/pull/71660/
3120 [71322]: https://github.com/rust-lang/rust/pull/71322/
3121 [70740]: https://github.com/rust-lang/rust/pull/70740/
3122 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
3123 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
3124 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
3125 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
3126 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
3129 Version 1.45.2 (2020-08-03)
3130 ==========================
3132 * [Fix bindings in tuple struct patterns][74954]
3133 * [Fix track_caller integration with trait objects][74784]
3135 [74954]: https://github.com/rust-lang/rust/issues/74954
3136 [74784]: https://github.com/rust-lang/rust/issues/74784
3139 Version 1.45.1 (2020-07-30)
3140 ==========================
3142 * [Fix const propagation with references.][73613]
3143 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3144 * [Avoid spurious implicit region bound.][74509]
3145 * [Install clippy on x.py install][74457]
3147 [73613]: https://github.com/rust-lang/rust/pull/73613
3148 [73078]: https://github.com/rust-lang/rust/issues/73078
3149 [74509]: https://github.com/rust-lang/rust/pull/74509
3150 [74457]: https://github.com/rust-lang/rust/pull/74457
3153 Version 1.45.0 (2020-07-16)
3154 ==========================
3158 - [Out of range float to int conversions using `as` has been defined as a saturating
3159 conversion.][71269] This was previously undefined behaviour, but you can use the
3160 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
3161 may be desirable in rare performance sensitive situations.
3162 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
3163 using `u64`.][70705]
3164 - [Function like procedural macros can now be used in expression, pattern, and statement
3165 positions.][68717] This means you can now use a function-like procedural macro
3166 anywhere you can use a declarative (`macro_rules!`) macro.
3170 - [You can now override individual target features through the `target-feature`
3171 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
3172 equivalent to `-C target-feature=+avx2,+fma`.
3173 - [Added the `force-unwind-tables` flag.][69984] This option allows
3174 rustc to always generate unwind tables regardless of panic strategy.
3175 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
3176 to include LLVM bitcode into generated `rlib`s (this is on by default).
3177 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
3178 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
3179 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
3180 - [Upgraded to LLVM 10.][67759]
3182 \* Refer to Rust's [platform support page][platform-support-doc] for more
3183 information on Rust's tiered platform support.
3188 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
3190 - [`proc_macro::TokenStream` now implements `Default`.][72234]
3191 - [You can now use `char` with
3192 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
3193 a range of codepoints.][72413] E.g.
3194 you can now write the following;
3196 for ch in 'a'..='z' {
3200 // Prints "abcdefghijklmnopqrstuvwxyz"
3202 - [`OsString` now implements `FromStr`.][71662]
3203 - [The `saturating_neg` method has been added to all signed integer primitive
3204 types, and the `saturating_abs` method has been added for all integer
3205 primitive types.][71886]
3206 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
3207 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
3209 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
3210 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
3211 integer types.][69813]
3212 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
3213 integer types.][72324]
3214 - [The `fetch_update` method has been added to all atomic integer types.][71843]
3219 - [`BTreeMap::remove_entry`]
3221 - [`rc::Weak::as_ptr`]
3222 - [`rc::Weak::from_raw`]
3223 - [`rc::Weak::into_raw`]
3224 - [`str::strip_prefix`]
3225 - [`str::strip_suffix`]
3226 - [`sync::Weak::as_ptr`]
3227 - [`sync::Weak::from_raw`]
3228 - [`sync::Weak::into_raw`]
3229 - [`char::UNICODE_VERSION`]
3230 - [`Span::resolved_at`]
3231 - [`Span::located_at`]
3232 - [`Span::mixed_site`]
3233 - [`unix::process::CommandExt::arg0`]
3238 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
3243 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
3244 `~~outdated information~~` becomes "~~outdated information~~".
3245 - [Added an emoji to Rustdoc's deprecated API message.][72014]
3249 - [Trying to self initialize a static value (that is creating a value using
3250 itself) is unsound and now causes a compile error.][71140]
3251 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
3252 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
3253 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
3254 previously undocumented and not intended for public use. Rustdoc still provides
3255 a non-zero exit code on errors.
3256 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
3257 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
3258 flags while cargo is adding `embed-bitcode` itself. The recommended way to
3259 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
3260 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
3264 - [Make clippy a git subtree instead of a git submodule][70655]
3265 - [Unify the undo log of all snapshot types][69464]
3267 [71848]: https://github.com/rust-lang/rust/issues/71848/
3268 [73420]: https://github.com/rust-lang/rust/issues/73420/
3269 [72324]: https://github.com/rust-lang/rust/pull/72324/
3270 [71843]: https://github.com/rust-lang/rust/pull/71843/
3271 [71886]: https://github.com/rust-lang/rust/pull/71886/
3272 [72234]: https://github.com/rust-lang/rust/pull/72234/
3273 [72239]: https://github.com/rust-lang/rust/pull/72239/
3274 [72397]: https://github.com/rust-lang/rust/pull/72397/
3275 [72413]: https://github.com/rust-lang/rust/pull/72413/
3276 [72014]: https://github.com/rust-lang/rust/pull/72014/
3277 [72062]: https://github.com/rust-lang/rust/pull/72062/
3278 [72094]: https://github.com/rust-lang/rust/pull/72094/
3279 [72133]: https://github.com/rust-lang/rust/pull/72133/
3280 [67759]: https://github.com/rust-lang/rust/pull/67759/
3281 [71900]: https://github.com/rust-lang/rust/pull/71900/
3282 [71928]: https://github.com/rust-lang/rust/pull/71928/
3283 [71662]: https://github.com/rust-lang/rust/pull/71662/
3284 [71716]: https://github.com/rust-lang/rust/pull/71716/
3285 [71447]: https://github.com/rust-lang/rust/pull/71447/
3286 [71269]: https://github.com/rust-lang/rust/pull/71269/
3287 [71095]: https://github.com/rust-lang/rust/pull/71095/
3288 [71140]: https://github.com/rust-lang/rust/pull/71140/
3289 [70655]: https://github.com/rust-lang/rust/pull/70655/
3290 [70705]: https://github.com/rust-lang/rust/pull/70705/
3291 [69984]: https://github.com/rust-lang/rust/pull/69984/
3292 [69813]: https://github.com/rust-lang/rust/pull/69813/
3293 [69464]: https://github.com/rust-lang/rust/pull/69464/
3294 [68717]: https://github.com/rust-lang/rust/pull/68717/
3295 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
3296 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
3297 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
3298 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
3299 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3300 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3301 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3302 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3303 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3304 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3305 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3306 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3307 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3308 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3309 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3310 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3311 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3314 Version 1.44.1 (2020-06-18)
3315 ===========================
3317 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3318 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3319 * [Fix crashes when finding backtrace on macOS.][71397]
3320 * [Clippy applies lint levels into different files.][clippy/5356]
3322 [71397]: https://github.com/rust-lang/rust/issues/71397
3323 [73078]: https://github.com/rust-lang/rust/issues/73078
3324 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3325 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3328 Version 1.44.0 (2020-06-04)
3329 ==========================
3333 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3334 - [Added the `unused_braces` lint.][70081]
3336 **Syntax-only changes**
3338 - [Expansion-driven outline module parsing][69838]
3343 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3348 These are still rejected semantically, so you will likely receive an error but
3349 these changes can be seen and parsed by macros and conditional compilation.
3353 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3354 Additionally when in incremental mode rustc defaults to 256 codegen units.
3355 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3356 a panic is thrown.][67502]
3357 - [Added tier 3\* support for the `aarch64-unknown-none` and
3358 `aarch64-unknown-none-softfloat` targets.][68334]
3359 - [Added tier 3 support for `arm64-apple-tvos` and
3360 `x86_64-apple-tvos` targets.][68191]
3365 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3366 `vec![]` to be able to be used in `const` contexts.
3367 - [`convert::Infallible` now implements `Hash`.][70281]
3368 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3369 a `&mut OsStr`.][70048]
3370 - [Unicode 13 is now supported.][69929]
3371 - [`String` now implements `From<&mut str>`.][69661]
3372 - [`IoSlice` now implements `Copy`.][69403]
3373 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3374 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3375 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3376 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3377 integer types.][69373]
3381 - [`PathBuf::with_capacity`]
3382 - [`PathBuf::capacity`]
3383 - [`PathBuf::clear`]
3384 - [`PathBuf::reserve`]
3385 - [`PathBuf::reserve_exact`]
3386 - [`PathBuf::shrink_to_fit`]
3387 - [`f32::to_int_unchecked`]
3388 - [`f64::to_int_unchecked`]
3389 - [`Layout::align_to`]
3390 - [`Layout::pad_to_align`]
3392 - [`Layout::extend`]
3396 - [Added the `cargo tree` command which will print a tree graph of
3397 your dependencies.][cargo/8062] E.g.
3399 mdbook v0.3.2 (/Users/src/rust/mdbook)
3401 │ ├── html5ever v0.24.0
3403 │ │ │ └── cfg-if v0.1.9
3405 │ │ └── markup5ever v0.9.0
3406 │ │ ├── log v0.4.8 (*)
3408 │ │ │ └── phf_shared v0.7.24
3409 │ │ │ ├── siphasher v0.2.3
3410 │ │ │ └── unicase v1.4.2
3411 │ │ │ [build-dependencies]
3412 │ │ │ └── version_check v0.1.5
3415 You can also display dependencies on multiple versions of the same crate with
3416 `cargo tree -d` (short for `cargo tree --duplicates`).
3420 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3421 the version in the sidebar.][69494]
3425 - [Rustc now correctly generates static libraries on Windows GNU targets with
3426 the `.a` extension, rather than the previous `.lib`.][70937]
3427 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3428 - [The `file_name` property in JSON output of macro errors now points the actual
3429 source file rather than the previous format of `<NAME macros>`.][70969]
3430 **Note:** this may not point to a file that actually exists on the user's system.
3431 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3432 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3433 not allow zero initialization such as `NonZeroU8`.][66059] This was
3434 previously a warning.
3435 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3436 operator has been defined as a saturating operation.][71269] This was previously
3437 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3438 continue using the current behaviour, which may be desirable in rare performance
3439 sensitive situations.
3443 These changes provide no direct user facing benefits, but represent significant
3444 improvements to the internals and overall performance of rustc and
3447 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3448 - [Replace big JS dict with JSON parsing.][71250]
3450 [69373]: https://github.com/rust-lang/rust/pull/69373/
3451 [66059]: https://github.com/rust-lang/rust/pull/66059/
3452 [68191]: https://github.com/rust-lang/rust/pull/68191/
3453 [68899]: https://github.com/rust-lang/rust/pull/68899/
3454 [71147]: https://github.com/rust-lang/rust/pull/71147/
3455 [71250]: https://github.com/rust-lang/rust/pull/71250/
3456 [70937]: https://github.com/rust-lang/rust/pull/70937/
3457 [70969]: https://github.com/rust-lang/rust/pull/70969/
3458 [70632]: https://github.com/rust-lang/rust/pull/70632/
3459 [70281]: https://github.com/rust-lang/rust/pull/70281/
3460 [70345]: https://github.com/rust-lang/rust/pull/70345/
3461 [70048]: https://github.com/rust-lang/rust/pull/70048/
3462 [70081]: https://github.com/rust-lang/rust/pull/70081/
3463 [70156]: https://github.com/rust-lang/rust/pull/70156/
3464 [71269]: https://github.com/rust-lang/rust/pull/71269/
3465 [69838]: https://github.com/rust-lang/rust/pull/69838/
3466 [69929]: https://github.com/rust-lang/rust/pull/69929/
3467 [69661]: https://github.com/rust-lang/rust/pull/69661/
3468 [69778]: https://github.com/rust-lang/rust/pull/69778/
3469 [69494]: https://github.com/rust-lang/rust/pull/69494/
3470 [69403]: https://github.com/rust-lang/rust/pull/69403/
3471 [69033]: https://github.com/rust-lang/rust/pull/69033/
3472 [68692]: https://github.com/rust-lang/rust/pull/68692/
3473 [68334]: https://github.com/rust-lang/rust/pull/68334/
3474 [67502]: https://github.com/rust-lang/rust/pull/67502/
3475 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3476 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3477 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3478 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3479 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3480 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3481 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3482 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3483 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3484 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3485 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3486 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3487 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3490 Version 1.43.1 (2020-05-07)
3491 ===========================
3493 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3494 * [Fixed the stabilization of AVX-512 features.][71473]
3495 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3497 [71430]: https://github.com/rust-lang/rust/pull/71430
3498 [71473]: https://github.com/rust-lang/rust/issues/71473
3499 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3502 Version 1.43.0 (2020-04-23)
3503 ==========================
3507 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3508 the type inferred correctly.][68129]
3509 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3511 **Syntax only changes**
3512 - [Allow `type Foo: Ord` syntactically.][69361]
3513 - [Fuse associated and extern items up to defaultness.][69194]
3514 - [Syntactically allow `self` in all `fn` contexts.][68764]
3515 - [Merge `fn` syntax + cleanup item parsing.][68728]
3516 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3517 For example, you may now write:
3519 macro_rules! mac_trait {
3529 These are still rejected *semantically*, so you will likely receive an error but
3530 these changes can be seen and parsed by macros and
3531 conditional compilation.
3536 - [You can now pass multiple lint flags to rustc to override the previous
3537 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3538 everything in the `unused` lint group except `unused-variables` which
3539 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3540 everything in the `unused` lint group **including** `unused-variables` since
3541 the allow flag is specified before the deny flag (and therefore overridden).
3542 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3543 if they are available on `windows-gnu`.][67429]
3544 - [rustc now buffers errors/warnings printed in JSON.][69227]
3548 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3549 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3550 respectively.][69538] **Note** These conversions are only available when `N`
3552 - [You can now use associated constants on floats and integers directly, rather
3553 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3554 `f32::NAN` with no imports.
3555 - [`u8::is_ascii` is now `const`.][68984]
3556 - [`String` now implements `AsMut<str>`.][68742]
3557 - [Added the `primitive` module to `std` and `core`.][67637] This module
3558 reexports Rust's primitive types. This is mainly useful in macros
3559 where you want avoid these types being shadowed.
3560 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3561 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3565 - [`Once::is_completed`]
3570 - [`iter::once_with`]
3574 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3575 your environment.][cargo/7823]
3576 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3577 executable path when running integration tests or benchmarks.][cargo/7697]
3578 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3579 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3583 - [Certain checks in the `const_err` lint were deemed unrelated to const
3584 evaluation][69185], and have been moved to the `unconditional_panic` and
3585 `arithmetic_overflow` lints.
3590 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3591 has been a warning since 1.36.0.
3592 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3593 led to some instances being accepted, and now correctly emits a hard error.
3595 [69340]: https://github.com/rust-lang/rust/pull/69340
3599 These changes provide no direct user facing benefits, but represent significant
3600 improvements to the internals and overall performance of `rustc` and
3603 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3604 - [Improved how rustc generates drop code.][67332]
3605 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3606 - [traits: preallocate 2 Vecs of known initial size][69022]
3607 - [Avoid exponential behaviour when relating types][68772]
3608 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3609 - [Improve performance of coherence checks][68966]
3610 - [Deduplicate types in the generator witness][68672]
3611 - [Invert control in struct_lint_level.][68725]
3613 [67332]: https://github.com/rust-lang/rust/pull/67332/
3614 [67429]: https://github.com/rust-lang/rust/pull/67429/
3615 [67637]: https://github.com/rust-lang/rust/pull/67637/
3616 [67642]: https://github.com/rust-lang/rust/pull/67642/
3617 [67878]: https://github.com/rust-lang/rust/pull/67878/
3618 [67885]: https://github.com/rust-lang/rust/pull/67885/
3619 [68129]: https://github.com/rust-lang/rust/pull/68129/
3620 [68672]: https://github.com/rust-lang/rust/pull/68672/
3621 [68725]: https://github.com/rust-lang/rust/pull/68725/
3622 [68728]: https://github.com/rust-lang/rust/pull/68728/
3623 [68738]: https://github.com/rust-lang/rust/pull/68738/
3624 [68742]: https://github.com/rust-lang/rust/pull/68742/
3625 [68764]: https://github.com/rust-lang/rust/pull/68764/
3626 [68772]: https://github.com/rust-lang/rust/pull/68772/
3627 [68943]: https://github.com/rust-lang/rust/pull/68943/
3628 [68952]: https://github.com/rust-lang/rust/pull/68952/
3629 [68966]: https://github.com/rust-lang/rust/pull/68966/
3630 [68984]: https://github.com/rust-lang/rust/pull/68984/
3631 [69022]: https://github.com/rust-lang/rust/pull/69022/
3632 [69185]: https://github.com/rust-lang/rust/pull/69185/
3633 [69194]: https://github.com/rust-lang/rust/pull/69194/
3634 [69201]: https://github.com/rust-lang/rust/pull/69201/
3635 [69227]: https://github.com/rust-lang/rust/pull/69227/
3636 [69548]: https://github.com/rust-lang/rust/pull/69548/
3637 [69256]: https://github.com/rust-lang/rust/pull/69256/
3638 [69361]: https://github.com/rust-lang/rust/pull/69361/
3639 [69366]: https://github.com/rust-lang/rust/pull/69366/
3640 [69538]: https://github.com/rust-lang/rust/pull/69538/
3641 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3642 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3643 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3644 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3645 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3646 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3647 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3648 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3651 Version 1.42.0 (2020-03-12)
3652 ==========================
3656 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3658 fn foo(words: &[&str]) {
3660 ["Hello", "World", "!", ..] => println!("Hello World!"),
3661 ["Foo", "Bar", ..] => println!("Baz"),
3662 rest => println!("{:?}", rest),
3666 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3667 that you can create an enum that has the exact layout and ABI of the type
3669 - [You can now use outer attribute procedural macros on inline modules.][64273]
3670 - [There are some *syntax-only* changes:][67131]
3671 - `default` is syntactically allowed before items in `trait` definitions.
3672 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3673 leave out their bodies in favor of `;`.
3674 - Bounds on associated types in `impl`s are now syntactically allowed
3675 (e.g. `type Foo: Ord;`).
3676 - `...` (the C-variadic type) may occur syntactically directly as the type of
3677 any function parameter.
3679 These are still rejected *semantically*, so you will likely receive an error
3680 but these changes can be seen and parsed by procedural macros and
3681 conditional compilation.
3685 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3686 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3687 - [`Option::{expect,unwrap}` and
3688 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3689 pointing to the location where they were called, rather than
3690 `core`'s internals. ][67887]
3692 \* Refer to Rust's [platform support page][platform-support-doc] for more
3693 information on Rust's tiered platform support.
3697 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3698 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3699 to implement `Sized`.][67935]
3700 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3701 - [`Layout::new` is now `const`.][66254]
3702 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3707 - [`CondVar::wait_while`]
3708 - [`CondVar::wait_timeout_while`]
3710 - [`DebugMap::value`]
3711 - [`ManuallyDrop::take`]
3713 - [`ptr::slice_from_raw_parts_mut`]
3714 - [`ptr::slice_from_raw_parts`]
3718 - [You no longer need to include `extern crate proc_macro;` to be able to
3719 `use proc_macro;` in the `2018` edition.][cargo/7700]
3723 - [`Error::description` has been deprecated, and its use will now produce a
3724 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3726 [68253]: https://github.com/rust-lang/rust/pull/68253/
3727 [68348]: https://github.com/rust-lang/rust/pull/68348/
3728 [67935]: https://github.com/rust-lang/rust/pull/67935/
3729 [68339]: https://github.com/rust-lang/rust/pull/68339/
3730 [68122]: https://github.com/rust-lang/rust/pull/68122/
3731 [64273]: https://github.com/rust-lang/rust/pull/64273/
3732 [67712]: https://github.com/rust-lang/rust/pull/67712/
3733 [67887]: https://github.com/rust-lang/rust/pull/67887/
3734 [67131]: https://github.com/rust-lang/rust/pull/67131/
3735 [67233]: https://github.com/rust-lang/rust/pull/67233/
3736 [66899]: https://github.com/rust-lang/rust/pull/66899/
3737 [66919]: https://github.com/rust-lang/rust/pull/66919/
3738 [66254]: https://github.com/rust-lang/rust/pull/66254/
3739 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3740 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3741 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3742 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3743 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3744 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3745 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3746 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3747 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3750 Version 1.41.1 (2020-02-27)
3751 ===========================
3753 * [Always check types of static items][69145]
3754 * [Always check lifetime bounds of `Copy` impls][69145]
3755 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3757 [69225]: https://github.com/rust-lang/rust/issues/69225
3758 [69145]: https://github.com/rust-lang/rust/pull/69145
3761 Version 1.41.0 (2020-01-30)
3762 ===========================
3767 - [You can now pass type parameters to foreign items when implementing
3768 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3769 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3770 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3771 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3772 - [You can now use any valid identifier in a `format_args` macro.][66847]
3773 Previously identifiers starting with an underscore were not allowed.
3774 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3775 enum variants.][66183] These are still rejected semantically, but
3776 can be seen and parsed by procedural macros and conditional compilation.
3777 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3778 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3779 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3781 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3786 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3787 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3788 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3789 - [You can now pass an arguments file passing the `@path` syntax
3790 to rustc.][66172] Note that the format differs somewhat from what is
3791 found in other tooling; please see [the documentation][argfile-docs] for
3793 - [You can now provide `--extern` flag without a path, indicating that it is
3794 available from the search path or specified with an `-L` flag.][64882]
3796 \* Refer to Rust's [platform support page][platform-support-doc] for more
3797 information on Rust's tiered platform support.
3799 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3804 - [The `core::panic` module is now stable.][66771] It was already stable
3806 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3807 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3808 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3813 - [`Result::map_or`]
3814 - [`Result::map_or_else`]
3815 - [`std::rc::Weak::weak_count`]
3816 - [`std::rc::Weak::strong_count`]
3817 - [`std::sync::Weak::weak_count`]
3818 - [`std::sync::Weak::strong_count`]
3823 - [Cargo will now document all the private items for binary crates
3824 by default.][cargo/7593]
3825 - [`cargo-install` will now reinstall the package if it detects that it is out
3826 of date.][cargo/7560]
3827 - [Cargo.lock now uses a more git friendly format that should help to reduce
3828 merge conflicts.][cargo/7579]
3829 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3830 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3831 optimisation level to `2` for debug builds. You can also use
3832 `[profile.<profile>.build-override]` to override build scripts and
3838 - [You can now specify `edition` in documentation code blocks to compile the block
3839 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3840 should be compiled the 2018 edition of Rust.
3841 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3842 current theme with `--check-theme`.][54733]
3843 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3848 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3849 Apple targets.][apple-32bit-drop] This means that the source code is still
3850 available to build, but the targets are no longer being tested and release
3851 binaries for those platforms will no longer be distributed by the Rust project.
3852 Please refer to the linked blog post for more information.
3854 [54733]: https://github.com/rust-lang/rust/pull/54733/
3855 [61351]: https://github.com/rust-lang/rust/pull/61351/
3856 [62514]: https://github.com/rust-lang/rust/pull/62514/
3857 [67255]: https://github.com/rust-lang/rust/pull/67255/
3858 [66661]: https://github.com/rust-lang/rust/pull/66661/
3859 [66771]: https://github.com/rust-lang/rust/pull/66771/
3860 [66847]: https://github.com/rust-lang/rust/pull/66847/
3861 [66238]: https://github.com/rust-lang/rust/pull/66238/
3862 [66277]: https://github.com/rust-lang/rust/pull/66277/
3863 [66325]: https://github.com/rust-lang/rust/pull/66325/
3864 [66172]: https://github.com/rust-lang/rust/pull/66172/
3865 [66183]: https://github.com/rust-lang/rust/pull/66183/
3866 [65879]: https://github.com/rust-lang/rust/pull/65879/
3867 [65013]: https://github.com/rust-lang/rust/pull/65013/
3868 [64882]: https://github.com/rust-lang/rust/pull/64882/
3869 [64325]: https://github.com/rust-lang/rust/pull/64325/
3870 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3871 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3872 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3873 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3874 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3875 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3876 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3877 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3878 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3879 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3880 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3882 Version 1.40.0 (2019-12-19)
3883 ===========================
3887 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3888 `const` contexts.][65188] e.g.
3891 pub struct Point(i32, i32);
3893 const ORIGIN: Point = {
3894 let constructor = Point;
3900 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3901 indicate that there may be variants or fields added in the future.][64639]
3902 For example this requires adding a wild-card branch (`_ => {}`) to any match
3903 statements on a non-exhaustive `enum`. [(RFC 2008)]
3904 - [You can now use function-like procedural macros in `extern` blocks and in
3905 type positions.][63931] e.g. `type Generated = macro!();`
3906 - [Function-like and attribute procedural macros can now emit
3907 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3908 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3909 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3910 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3914 - [Added tier 3 support\* for the
3915 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3916 - [Added tier 3 support for the
3917 `aarch64-unknown-none-softfloat` target.][64589]
3918 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3919 `mips64el-unknown-linux-muslabi64` targets.][65843]
3921 \* Refer to Rust's [platform support page][platform-support-doc] for more
3922 information on Rust's tiered platform support.
3926 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3930 - [`BTreeMap::get_key_value`]
3931 - [`HashMap::get_key_value`]
3932 - [`Option::as_deref_mut`]
3933 - [`Option::as_deref`]
3934 - [`Option::flatten`]
3935 - [`UdpSocket::peer_addr`]
3936 - [`f32::to_be_bytes`]
3937 - [`f32::to_le_bytes`]
3938 - [`f32::to_ne_bytes`]
3939 - [`f64::to_be_bytes`]
3940 - [`f64::to_le_bytes`]
3941 - [`f64::to_ne_bytes`]
3942 - [`f32::from_be_bytes`]
3943 - [`f32::from_le_bytes`]
3944 - [`f32::from_ne_bytes`]
3945 - [`f64::from_be_bytes`]
3946 - [`f64::from_le_bytes`]
3947 - [`f64::from_ne_bytes`]
3954 - [Cargo will now always display warnings, rather than only on
3955 fresh builds.][cargo/7450]
3956 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3957 now produce an error.][cargo/7507] Previously these flags were ignored.
3958 - [You can now publish `dev-dependencies` without including
3959 a `version`.][cargo/7333]
3963 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3964 when running documentation tests with `rustdoc`.][63803]
3968 - [As previously announced, any previous NLL warnings in the 2015 edition are
3969 now hard errors.][64221]
3970 - [The `include!` macro will now warn if it failed to include the
3971 entire file.][64284] The `include!` macro unintentionally only includes the
3972 first _expression_ in a file, and this can be unintuitive. This will become
3973 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3974 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3975 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3976 or `extern` blocks now correctly emits a hard error.
3978 [65294]: https://github.com/rust-lang/rust/pull/65294/
3979 [66103]: https://github.com/rust-lang/rust/pull/66103/
3980 [65843]: https://github.com/rust-lang/rust/pull/65843/
3981 [65188]: https://github.com/rust-lang/rust/pull/65188/
3982 [65092]: https://github.com/rust-lang/rust/pull/65092/
3983 [64589]: https://github.com/rust-lang/rust/pull/64589/
3984 [64639]: https://github.com/rust-lang/rust/pull/64639/
3985 [64221]: https://github.com/rust-lang/rust/pull/64221/
3986 [64284]: https://github.com/rust-lang/rust/pull/64284/
3987 [63931]: https://github.com/rust-lang/rust/pull/63931/
3988 [64035]: https://github.com/rust-lang/rust/pull/64035/
3989 [63674]: https://github.com/rust-lang/rust/pull/63674/
3990 [63803]: https://github.com/rust-lang/rust/pull/63803/
3991 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3992 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3993 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3994 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3995 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3996 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3997 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3998 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3999 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
4000 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
4001 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
4002 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
4003 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
4004 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
4005 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
4006 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
4007 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
4008 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
4009 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
4010 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
4011 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
4012 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
4013 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
4014 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
4015 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
4018 Version 1.39.0 (2019-11-07)
4019 ===========================
4023 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
4024 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
4025 - [You can now use certain attributes on function, closure, and function pointer
4026 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
4027 `deny`, `forbid` as well as inert helper attributes used by procedural macro
4028 attributes applied to items. e.g.
4031 #[cfg(windows)] slice: &[u16],
4032 #[cfg(not(windows))] slice: &[u8],
4037 - [You can now take shared references to bind-by-move patterns in the `if` guards
4038 of `match` arms.][63118] e.g.
4041 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
4045 // ---- `nums` is bound by move.
4046 if nums.iter().sum::<u8>() == 10
4047 // ^------ `.iter()` implicitly takes a reference to `nums`.
4050 // ----------- Legal as `nums` was bound by move and so we have ownership.
4052 _ => unreachable!(),
4061 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
4062 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
4063 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
4064 **Note** Cargo currently doesn't use this feature. Refer to
4065 [cargo#7315][cargo/7315] to track this feature's progress.
4066 - [You can now pass `--show-output` argument to test binaries to print the
4067 output of successful tests.][62600]
4070 \* Refer to Rust's [platform support page][platform-support-doc] for more
4071 information on Rust's tiered platform support.
4075 - [`Vec::new` and `String::new` are now `const` functions.][64028]
4076 - [`LinkedList::new` is now a `const` function.][63684]
4077 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
4078 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
4079 now `const`.][63786]
4083 - [`Pin::into_inner`]
4084 - [`Instant::checked_duration_since`]
4085 - [`Instant::saturating_duration_since`]
4089 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
4090 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
4091 `--all` is now deprecated.
4095 - [You can now pass `-Clinker` to rustdoc to control the linker used
4096 for compiling doctests.][63834]
4100 - [Code that was previously accepted by the old borrow checker, but rejected by
4101 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
4102 previously a warning, and will also become a hard error in the Rust 2015
4103 edition in the 1.40.0 release.
4104 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
4105 run tests.][63827] This should improve performance when running a large
4107 - [The `try!` macro will now issue a deprecation warning.][62672] It is
4108 recommended to use the `?` operator instead.
4109 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
4112 [62600]: https://github.com/rust-lang/rust/pull/62600/
4113 [62672]: https://github.com/rust-lang/rust/pull/62672/
4114 [63118]: https://github.com/rust-lang/rust/pull/63118/
4115 [63209]: https://github.com/rust-lang/rust/pull/63209/
4116 [63402]: https://github.com/rust-lang/rust/pull/63402/
4117 [63565]: https://github.com/rust-lang/rust/pull/63565/
4118 [63595]: https://github.com/rust-lang/rust/pull/63595/
4119 [63684]: https://github.com/rust-lang/rust/pull/63684/
4120 [63698]: https://github.com/rust-lang/rust/pull/63698/
4121 [63770]: https://github.com/rust-lang/rust/pull/63770/
4122 [63786]: https://github.com/rust-lang/rust/pull/63786/
4123 [63827]: https://github.com/rust-lang/rust/pull/63827/
4124 [63834]: https://github.com/rust-lang/rust/pull/63834/
4125 [64010]: https://github.com/rust-lang/rust/pull/64010/
4126 [64028]: https://github.com/rust-lang/rust/pull/64028/
4127 [64334]: https://github.com/rust-lang/rust/pull/64334/
4128 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
4129 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
4130 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
4131 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
4132 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
4133 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
4135 Version 1.38.0 (2019-09-26)
4136 ==========================
4140 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
4141 - [The `#[deprecated]` attribute can now be used on macros.][62042]
4145 - [Added pipelined compilation support to `rustc`.][62766] This will
4146 improve compilation times in some cases. For further information please refer
4147 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
4148 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
4149 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
4150 `x86_64-uwp-windows-msvc` targets.][60260]
4151 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
4152 `armv7-unknown-linux-musleabi` targets.][63107]
4153 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
4154 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
4155 - [Upgraded to LLVM 9.][62592]
4157 \* Refer to Rust's [platform support page][platform-support-doc] for more
4158 information on Rust's tiered platform support.
4162 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
4163 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
4164 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
4165 is available at `std::clone::Clone`). This also makes all built-in macros
4166 available in `std`/`core` root. e.g. `std::include_bytes!`.
4167 - [`str::Chars` now implements `Debug`.][63000]
4168 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
4169 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
4170 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
4171 - [Added euclidean remainder and division operations (`div_euclid`,
4172 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
4173 `overflowing`, and `wrapping` versions are available for all
4175 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
4176 `PartialEq`.][61491]
4177 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
4181 - [`<*const T>::cast`]
4182 - [`<*mut T>::cast`]
4183 - [`Duration::as_secs_f32`]
4184 - [`Duration::as_secs_f64`]
4185 - [`Duration::div_f32`]
4186 - [`Duration::div_f64`]
4187 - [`Duration::from_secs_f32`]
4188 - [`Duration::from_secs_f64`]
4189 - [`Duration::mul_f32`]
4190 - [`Duration::mul_f64`]
4191 - [`any::type_name`]
4195 - [Added pipelined compilation support to `cargo`.][cargo/7143]
4196 - [You can now pass the `--features` option multiple times to enable
4197 multiple features.][cargo/7084]
4202 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
4206 - [`rustc` will now warn about some incorrect uses of
4207 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
4211 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
4213 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
4214 issues][62896] with certain crates such as libc.
4216 [60260]: https://github.com/rust-lang/rust/pull/60260/
4217 [61457]: https://github.com/rust-lang/rust/pull/61457/
4218 [61491]: https://github.com/rust-lang/rust/pull/61491/
4219 [61884]: https://github.com/rust-lang/rust/pull/61884/
4220 [61953]: https://github.com/rust-lang/rust/pull/61953/
4221 [62042]: https://github.com/rust-lang/rust/pull/62042/
4222 [62528]: https://github.com/rust-lang/rust/pull/62528/
4223 [62583]: https://github.com/rust-lang/rust/pull/62583/
4224 [62735]: https://github.com/rust-lang/rust/pull/62735/
4225 [62766]: https://github.com/rust-lang/rust/pull/62766/
4226 [62784]: https://github.com/rust-lang/rust/pull/62784/
4227 [62592]: https://github.com/rust-lang/rust/pull/62592/
4228 [62785]: https://github.com/rust-lang/rust/issues/62785/
4229 [62814]: https://github.com/rust-lang/rust/pull/62814/
4230 [62896]: https://github.com/rust-lang/rust/issues/62896/
4231 [63000]: https://github.com/rust-lang/rust/pull/63000/
4232 [63056]: https://github.com/rust-lang/rust/pull/63056/
4233 [63107]: https://github.com/rust-lang/rust/pull/63107/
4234 [63346]: https://github.com/rust-lang/rust/pull/63346/
4235 [63421]: https://github.com/rust-lang/rust/pull/63421/
4236 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
4237 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
4238 [63048]: https://github.com/rust-lang/rust/pull/63048
4239 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4240 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4241 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
4242 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
4243 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
4244 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
4245 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
4246 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
4247 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
4248 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
4249 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
4250 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
4251 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
4253 Version 1.37.0 (2019-08-15)
4254 ==========================
4258 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
4259 [`Box`][62228], or an [array][62235] and unused.
4260 - [You can now use the `cfg` and `cfg_attr` attributes on
4261 generic parameters.][61547]
4262 - [You can now use enum variants through type alias.][61682] e.g. You can
4263 write the following:
4265 type MyOption = Option<u8>;
4267 fn increment_or_zero(x: MyOption) -> u8 {
4269 MyOption::Some(y) => y + 1,
4270 MyOption::None => 0,
4274 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
4275 `const _: u32 = 5;`.
4276 - [You can now use `#[repr(align(X)]` on enums.][61229]
4277 - [The `?` Kleene macro operator is now available in the
4278 2015 edition.][60932]
4282 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
4283 and `-C profile-use` flags.][61268] For more information on how to use profile
4284 guided optimization, please refer to the [rustc book][rustc-book-pgo].
4285 - [The `rust-lldb` wrapper script should now work again.][61827]
4289 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
4293 - [`BufReader::buffer`]
4294 - [`BufWriter::buffer`]
4295 - [`Cell::from_mut`]
4296 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
4297 - [`DoubleEndedIterator::nth_back`]
4299 - [`Wrapping::reverse_bits`]
4300 - [`i128::reverse_bits`]
4301 - [`i16::reverse_bits`]
4302 - [`i32::reverse_bits`]
4303 - [`i64::reverse_bits`]
4304 - [`i8::reverse_bits`]
4305 - [`isize::reverse_bits`]
4306 - [`slice::copy_within`]
4307 - [`u128::reverse_bits`]
4308 - [`u16::reverse_bits`]
4309 - [`u32::reverse_bits`]
4310 - [`u64::reverse_bits`]
4311 - [`u8::reverse_bits`]
4312 - [`usize::reverse_bits`]
4316 - [`Cargo.lock` files are now included by default when publishing executable crates
4317 with executables.][cargo/7026]
4318 - [You can now specify `default-run="foo"` in `[package]` to specify the
4319 default executable to use for `cargo run`.][cargo/7056]
4326 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4327 Please transition your code to using the `..=` syntax for inclusive
4329 - [Using a trait object without the `dyn` will now warn by default.][61203]
4330 Please transition your code to use `dyn Trait` for trait objects instead.
4332 [62228]: https://github.com/rust-lang/rust/pull/62228/
4333 [62235]: https://github.com/rust-lang/rust/pull/62235/
4334 [61802]: https://github.com/rust-lang/rust/pull/61802/
4335 [61827]: https://github.com/rust-lang/rust/pull/61827/
4336 [61547]: https://github.com/rust-lang/rust/pull/61547/
4337 [61682]: https://github.com/rust-lang/rust/pull/61682/
4338 [61268]: https://github.com/rust-lang/rust/pull/61268/
4339 [61342]: https://github.com/rust-lang/rust/pull/61342/
4340 [61347]: https://github.com/rust-lang/rust/pull/61347/
4341 [61100]: https://github.com/rust-lang/rust/pull/61100/
4342 [61203]: https://github.com/rust-lang/rust/pull/61203/
4343 [61229]: https://github.com/rust-lang/rust/pull/61229/
4344 [60932]: https://github.com/rust-lang/rust/pull/60932/
4345 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4346 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4347 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4348 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4349 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4350 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4351 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4352 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4353 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4354 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4355 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4356 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4357 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4358 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4359 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4360 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4361 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4362 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4363 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4364 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4365 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4366 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4367 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4370 Version 1.36.0 (2019-07-04)
4371 ==========================
4375 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4376 - [The order of traits in trait objects no longer affects the semantics of that
4377 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4378 `dyn fmt::Debug + Send`, where this was previously not the case.
4382 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4383 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4384 - [`mem::needs_drop` is now available as a const fn.][60364]
4385 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4386 - [`String` now implements `BorrowMut<str>`.][60404]
4387 - [`io::Cursor` now implements `Default`.][60234]
4388 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4389 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4390 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4391 environment has access to heap memory allocation.
4392 - [`String` now implements `From<&String>`.][59825]
4393 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4394 return a tuple of each argument when there is multiple arguments.
4395 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4400 - [`VecDeque::rotate_left`]
4401 - [`VecDeque::rotate_right`]
4402 - [`Iterator::copied`]
4404 - [`io::IoSliceMut`]
4405 - [`Read::read_vectored`]
4406 - [`Write::write_vectored`]
4407 - [`str::as_mut_ptr`]
4408 - [`mem::MaybeUninit`]
4409 - [`pointer::align_offset`]
4410 - [`future::Future`]
4412 - [`task::RawWaker`]
4413 - [`task::RawWakerVTable`]
4419 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4420 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4422 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4426 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4433 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4434 longer recommended, and will be deprecated in 1.39.0.
4436 [60318]: https://github.com/rust-lang/rust/pull/60318/
4437 [60364]: https://github.com/rust-lang/rust/pull/60364/
4438 [60370]: https://github.com/rust-lang/rust/pull/60370/
4439 [60404]: https://github.com/rust-lang/rust/pull/60404/
4440 [60234]: https://github.com/rust-lang/rust/pull/60234/
4441 [60244]: https://github.com/rust-lang/rust/pull/60244/
4442 [58623]: https://github.com/rust-lang/rust/pull/58623/
4443 [59648]: https://github.com/rust-lang/rust/pull/59648/
4444 [59675]: https://github.com/rust-lang/rust/pull/59675/
4445 [59825]: https://github.com/rust-lang/rust/pull/59825/
4446 [59826]: https://github.com/rust-lang/rust/pull/59826/
4447 [59445]: https://github.com/rust-lang/rust/pull/59445/
4448 [59114]: https://github.com/rust-lang/rust/pull/59114/
4449 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4450 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4451 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4452 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4453 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4454 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4455 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4456 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4457 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4458 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4459 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4460 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4461 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4462 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4463 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4464 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4465 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4466 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4467 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4468 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4471 Version 1.35.0 (2019-05-23)
4472 ==========================
4476 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4477 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4478 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4480 unsafe fn call_unsafe(func: unsafe fn()) {
4485 unsafe { call_unsafe(|| {}); }
4492 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4493 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4494 - [Added the `wasm32-unknown-wasi` target.][59464]
4499 - [`Thread` will now show its ID in `Debug` output.][59460]
4500 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4501 - [`alloc::System` now implements `Default`.][59451]
4502 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4504 - [`char::{ToLowercase, ToUppercase}` now
4505 implement `ExactSizeIterator`.][58778]
4506 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4507 - [Removed the `Read` trait bounds
4508 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4509 - [You can now call the `dbg!` macro without any parameters to print the file
4510 and line where it is called.][57847]
4511 - [In place ASCII case conversions are now up to 4× faster.][59283]
4512 e.g. `str::make_ascii_lowercase`
4513 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4520 - [`RefCell::replace_with`]
4521 - [`RefCell::map_split`]
4523 - [`Range::contains`]
4524 - [`RangeFrom::contains`]
4525 - [`RangeTo::contains`]
4526 - [`RangeInclusive::contains`]
4527 - [`RangeToInclusive::contains`]
4528 - [`Option::copied`]
4532 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4533 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4538 - [The Rust toolchain is now available natively for musl based distros.][58575]
4540 [59460]: https://github.com/rust-lang/rust/pull/59460/
4541 [59464]: https://github.com/rust-lang/rust/pull/59464/
4542 [59500]: https://github.com/rust-lang/rust/pull/59500/
4543 [59512]: https://github.com/rust-lang/rust/pull/59512/
4544 [59580]: https://github.com/rust-lang/rust/pull/59580/
4545 [59283]: https://github.com/rust-lang/rust/pull/59283/
4546 [59451]: https://github.com/rust-lang/rust/pull/59451/
4547 [59076]: https://github.com/rust-lang/rust/pull/59076/
4548 [58778]: https://github.com/rust-lang/rust/pull/58778/
4549 [58717]: https://github.com/rust-lang/rust/pull/58717/
4550 [58369]: https://github.com/rust-lang/rust/pull/58369/
4551 [58423]: https://github.com/rust-lang/rust/pull/58423/
4552 [58080]: https://github.com/rust-lang/rust/pull/58080/
4553 [57847]: https://github.com/rust-lang/rust/pull/57847/
4554 [58575]: https://github.com/rust-lang/rust/pull/58575
4555 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4556 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4557 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4558 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4559 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4560 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4561 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4562 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4563 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4564 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4565 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4566 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4568 Version 1.34.2 (2019-05-14)
4569 ===========================
4571 * [Destabilize the `Error::type_id` function due to a security
4572 vulnerability][60785] ([CVE-2019-12083])
4574 [60785]: https://github.com/rust-lang/rust/pull/60785
4575 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4577 Version 1.34.1 (2019-04-25)
4578 ===========================
4580 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4581 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4582 * [Fix Clippy panic when checking some macros][clippy/3805]
4584 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4585 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4586 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4588 Version 1.34.0 (2019-04-11)
4589 ==========================
4593 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4594 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4596 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4597 `#[attr{}]` procedural macros.][57367]
4598 - [You can now write `extern crate self as foo;`][57407] to import your
4599 crate's root into the extern prelude.
4604 - [You can now target `riscv64imac-unknown-none-elf` and
4605 `riscv64gc-unknown-none-elf`.][58406]
4606 - [You can now enable linker plugin LTO optimisations with
4607 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4608 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4610 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4615 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4616 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4617 the `Hash` trait to create an iterator.
4618 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4619 methods.][58421] Most notably you no longer require the `Ord` trait to create
4621 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4622 for all numeric types.][58044]
4623 - [Indexing a `str` is now generic over all types that
4624 implement `SliceIndex<str>`.][57604]
4625 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4626 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4627 produce a warning if their returning type is unused.
4628 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4629 `overflowing_pow` are now available for all numeric types.][57873] These are
4630 equivalent to methods such as `wrapping_add` for the `pow` operation.
4638 * [`Error::type_id`]
4639 * [`atomic::AtomicI16`]
4640 * [`atomic::AtomicI32`]
4641 * [`atomic::AtomicI64`]
4642 * [`atomic::AtomicI8`]
4643 * [`atomic::AtomicU16`]
4644 * [`atomic::AtomicU32`]
4645 * [`atomic::AtomicU64`]
4646 * [`atomic::AtomicU8`]
4647 * [`convert::Infallible`]
4648 * [`convert::TryFrom`]
4649 * [`convert::TryInto`]
4651 * [`iter::successors`]
4652 * [`num::NonZeroI128`]
4653 * [`num::NonZeroI16`]
4654 * [`num::NonZeroI32`]
4655 * [`num::NonZeroI64`]
4656 * [`num::NonZeroI8`]
4657 * [`num::NonZeroIsize`]
4658 * [`slice::sort_by_cached_key`]
4659 * [`str::escape_debug`]
4660 * [`str::escape_default`]
4661 * [`str::escape_unicode`]
4662 * [`str::split_ascii_whitespace`]
4665 * [`Instant::checked_add`]
4666 * [`Instant::checked_sub`]
4667 * [`SystemTime::checked_add`]
4668 * [`SystemTime::checked_sub`]
4672 - [You can now use alternative registries to crates.io.][cargo/6654]
4676 - [You can now use the `?` operator in your documentation tests without manually
4677 adding `fn main() -> Result<(), _> {}`.][56470]
4681 - [`Command::before_exec` is being replaced by the unsafe method
4682 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4683 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4684 can now use `const` functions in `static` variables.
4686 [58370]: https://github.com/rust-lang/rust/pull/58370/
4687 [58406]: https://github.com/rust-lang/rust/pull/58406/
4688 [58421]: https://github.com/rust-lang/rust/pull/58421/
4689 [58166]: https://github.com/rust-lang/rust/pull/58166/
4690 [58044]: https://github.com/rust-lang/rust/pull/58044/
4691 [58057]: https://github.com/rust-lang/rust/pull/58057/
4692 [58059]: https://github.com/rust-lang/rust/pull/58059/
4693 [57809]: https://github.com/rust-lang/rust/pull/57809/
4694 [57873]: https://github.com/rust-lang/rust/pull/57873/
4695 [57604]: https://github.com/rust-lang/rust/pull/57604/
4696 [57367]: https://github.com/rust-lang/rust/pull/57367/
4697 [57407]: https://github.com/rust-lang/rust/pull/57407/
4698 [57425]: https://github.com/rust-lang/rust/pull/57425/
4699 [57106]: https://github.com/rust-lang/rust/pull/57106/
4700 [56470]: https://github.com/rust-lang/rust/pull/56470/
4701 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4702 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4703 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4704 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4705 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4706 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4707 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4708 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4709 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4710 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4711 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4712 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4713 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4714 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4715 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4716 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4717 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4718 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4719 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4720 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4721 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4722 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4723 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4724 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4725 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4726 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4727 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4728 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4729 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4730 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4731 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4734 Version 1.33.0 (2019-02-28)
4735 ==========================
4739 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4740 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4741 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4742 E.g. You can have match statement on a `u8` that covers `0..=255` and
4743 you would no longer be required to have a `_ => unreachable!()` case.
4744 - [You can now have multiple patterns in `if let` and `while let`
4745 expressions.][57532] You can do this with the same syntax as a `match`
4755 let state = Creature::Crab("Ferris");
4757 if let Creature::Crab(name) | Creature::Person(name) = state {
4758 println!("This creature's name is: {}", name);
4762 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4763 this feature will by default produce a warning as this behaviour can be
4764 unintuitive. E.g. `if let _ = 5 {}`
4765 - [You can now use `let` bindings, assignments, expression statements,
4766 and irrefutable pattern destructuring in const functions.][57175]
4767 - [You can now call unsafe const functions.][57067] E.g.
4769 const unsafe fn foo() -> i32 { 5 }
4770 const fn bar() -> i32 {
4774 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4775 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4776 - [You can now specify a specific alignment with the `#[repr(packed)]`
4777 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4778 with an alignment of 2 bytes and a size of 6 bytes.
4779 - [You can now import an item from a module as an `_`.][56303] This allows you to
4780 import a trait's impls, and not have the name in the namespace. E.g.
4782 use std::io::Read as _;
4784 // Allowed as there is only one `Read` in the module.
4787 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4791 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4792 command line argument.][56351]
4793 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4794 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4795 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4796 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4797 information on Rust's platform support.
4798 - [Added support for the `thumbv7neon-linux-androideabi` and
4799 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4800 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4804 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4805 functions for all numeric types.][57566]
4806 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4807 are now `const` functions for all numeric types.][57105]
4808 - [The methods `is_positive` and `is_negative` are now `const` functions for
4809 all signed numeric types.][57105]
4810 - [The `get` method for all `NonZero` types is now `const`.][57167]
4811 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4812 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4813 numeric types.][57234]
4814 - [`Ipv4Addr::new` is now a `const` function][57234]
4818 - [`unix::FileExt::read_exact_at`]
4819 - [`unix::FileExt::write_all_at`]
4820 - [`Option::transpose`]
4821 - [`Result::transpose`]
4822 - [`convert::identity`]
4825 - [`marker::PhantomPinned`]
4826 - [`Vec::resize_with`]
4827 - [`VecDeque::resize_with`]
4828 - [`Duration::as_millis`]
4829 - [`Duration::as_micros`]
4830 - [`Duration::as_nanos`]
4835 - [You can now publish crates that require a feature flag to compile with
4836 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4837 - [Cargo should now rebuild a crate if a file was modified during the initial
4842 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4843 are now deprecated in the standard library, and their usage will now produce a warning.
4844 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4846 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4848 - [Libtest no longer creates a new thread for each test when
4849 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4851 [56243]: https://github.com/rust-lang/rust/pull/56243
4852 [56303]: https://github.com/rust-lang/rust/pull/56303/
4853 [56351]: https://github.com/rust-lang/rust/pull/56351/
4854 [56362]: https://github.com/rust-lang/rust/pull/56362
4855 [56642]: https://github.com/rust-lang/rust/pull/56642/
4856 [56769]: https://github.com/rust-lang/rust/pull/56769/
4857 [56805]: https://github.com/rust-lang/rust/pull/56805
4858 [56947]: https://github.com/rust-lang/rust/pull/56947/
4859 [57049]: https://github.com/rust-lang/rust/pull/57049/
4860 [57067]: https://github.com/rust-lang/rust/pull/57067/
4861 [57105]: https://github.com/rust-lang/rust/pull/57105
4862 [57130]: https://github.com/rust-lang/rust/pull/57130/
4863 [57167]: https://github.com/rust-lang/rust/pull/57167/
4864 [57175]: https://github.com/rust-lang/rust/pull/57175/
4865 [57234]: https://github.com/rust-lang/rust/pull/57234/
4866 [57332]: https://github.com/rust-lang/rust/pull/57332/
4867 [57465]: https://github.com/rust-lang/rust/pull/57465/
4868 [57532]: https://github.com/rust-lang/rust/pull/57532/
4869 [57535]: https://github.com/rust-lang/rust/pull/57535/
4870 [57566]: https://github.com/rust-lang/rust/pull/57566/
4871 [57615]: https://github.com/rust-lang/rust/pull/57615/
4872 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4873 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4874 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4875 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4876 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4877 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4878 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4879 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4880 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4881 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4882 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4883 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4884 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4885 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4886 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4887 [platform-support]: https://forge.rust-lang.org/platform-support.html
4889 Version 1.32.0 (2019-01-17)
4890 ==========================
4895 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4896 operator allows you to specify zero or one repetitions similar to the `*` and
4898 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4899 now always resolve to the item (`enum`, `struct`, etc.) available in the
4900 module if present, before resolving to a external crate or an item the prelude.][56759]
4903 enum Color { Red, Green, Blue }
4909 - [You can now match against `PhantomData<T>` types.][55837]
4910 - [You can now match against literals in macros with the `literal`
4911 specifier.][56072] This will match against a literal of any type.
4912 E.g. `1`, `'A'`, `"Hello World"`
4913 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4915 struct Point(i32, i32);
4918 pub fn new(x: i32, y: i32) -> Self {
4922 pub fn is_origin(&self) -> bool {
4930 - [Self can also now be used in type definitions.][56366] E.g.
4934 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4937 Cons(T, Box<Self>) // likewise here
4940 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4941 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4945 - [The default allocator has changed from jemalloc to the default allocator on
4946 your system.][55238] The compiler itself on Linux & macOS will still use
4947 jemalloc, but programs compiled with it will use the system allocator.
4948 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4952 - [`PathBuf` now implements `FromStr`.][55148]
4953 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4954 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4955 easily debug expressions in your rust program. E.g.
4958 let b = dbg!(a * 2) + 1;
4959 // ^-- prints: [src/main.rs:4] a * 2 = 4
4963 The following APIs are now `const` functions and can be used in a
4967 - [`UnsafeCell::get`]
4968 - [`char::is_ascii`]
4970 - [`ManuallyDrop::new`]
4971 - [`ManuallyDrop::into_inner`]
4972 - [`RangeInclusive::start`]
4973 - [`RangeInclusive::end`]
4974 - [`NonNull::as_ptr`]
4977 - [`Duration::as_secs`]
4978 - [`Duration::subsec_millis`]
4979 - [`Duration::subsec_micros`]
4980 - [`Duration::subsec_nanos`]
4982 - [`Ipv4Addr::is_unspecified`]
4984 - [`Ipv6Addr::octets`]
4988 - [`i8::to_be_bytes`]
4989 - [`i8::to_le_bytes`]
4990 - [`i8::to_ne_bytes`]
4991 - [`i8::from_be_bytes`]
4992 - [`i8::from_le_bytes`]
4993 - [`i8::from_ne_bytes`]
4994 - [`i16::to_be_bytes`]
4995 - [`i16::to_le_bytes`]
4996 - [`i16::to_ne_bytes`]
4997 - [`i16::from_be_bytes`]
4998 - [`i16::from_le_bytes`]
4999 - [`i16::from_ne_bytes`]
5000 - [`i32::to_be_bytes`]
5001 - [`i32::to_le_bytes`]
5002 - [`i32::to_ne_bytes`]
5003 - [`i32::from_be_bytes`]
5004 - [`i32::from_le_bytes`]
5005 - [`i32::from_ne_bytes`]
5006 - [`i64::to_be_bytes`]
5007 - [`i64::to_le_bytes`]
5008 - [`i64::to_ne_bytes`]
5009 - [`i64::from_be_bytes`]
5010 - [`i64::from_le_bytes`]
5011 - [`i64::from_ne_bytes`]
5012 - [`i128::to_be_bytes`]
5013 - [`i128::to_le_bytes`]
5014 - [`i128::to_ne_bytes`]
5015 - [`i128::from_be_bytes`]
5016 - [`i128::from_le_bytes`]
5017 - [`i128::from_ne_bytes`]
5018 - [`isize::to_be_bytes`]
5019 - [`isize::to_le_bytes`]
5020 - [`isize::to_ne_bytes`]
5021 - [`isize::from_be_bytes`]
5022 - [`isize::from_le_bytes`]
5023 - [`isize::from_ne_bytes`]
5024 - [`u8::to_be_bytes`]
5025 - [`u8::to_le_bytes`]
5026 - [`u8::to_ne_bytes`]
5027 - [`u8::from_be_bytes`]
5028 - [`u8::from_le_bytes`]
5029 - [`u8::from_ne_bytes`]
5030 - [`u16::to_be_bytes`]
5031 - [`u16::to_le_bytes`]
5032 - [`u16::to_ne_bytes`]
5033 - [`u16::from_be_bytes`]
5034 - [`u16::from_le_bytes`]
5035 - [`u16::from_ne_bytes`]
5036 - [`u32::to_be_bytes`]
5037 - [`u32::to_le_bytes`]
5038 - [`u32::to_ne_bytes`]
5039 - [`u32::from_be_bytes`]
5040 - [`u32::from_le_bytes`]
5041 - [`u32::from_ne_bytes`]
5042 - [`u64::to_be_bytes`]
5043 - [`u64::to_le_bytes`]
5044 - [`u64::to_ne_bytes`]
5045 - [`u64::from_be_bytes`]
5046 - [`u64::from_le_bytes`]
5047 - [`u64::from_ne_bytes`]
5048 - [`u128::to_be_bytes`]
5049 - [`u128::to_le_bytes`]
5050 - [`u128::to_ne_bytes`]
5051 - [`u128::from_be_bytes`]
5052 - [`u128::from_le_bytes`]
5053 - [`u128::from_ne_bytes`]
5054 - [`usize::to_be_bytes`]
5055 - [`usize::to_le_bytes`]
5056 - [`usize::to_ne_bytes`]
5057 - [`usize::from_be_bytes`]
5058 - [`usize::from_le_bytes`]
5059 - [`usize::from_ne_bytes`]
5063 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
5064 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
5068 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
5072 - [The argument types for AVX's
5073 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
5074 been changed from `*const` to `*mut` as the previous implementation
5078 [55148]: https://github.com/rust-lang/rust/pull/55148/
5079 [55238]: https://github.com/rust-lang/rust/pull/55238/
5080 [55280]: https://github.com/rust-lang/rust/pull/55280/
5081 [55610]: https://github.com/rust-lang/rust/pull/55610/
5082 [55663]: https://github.com/rust-lang/rust/pull/55663/
5083 [55702]: https://github.com/rust-lang/rust/pull/55702/
5084 [55837]: https://github.com/rust-lang/rust/pull/55837/
5085 [55843]: https://github.com/rust-lang/rust/pull/55843/
5086 [56072]: https://github.com/rust-lang/rust/pull/56072/
5087 [56245]: https://github.com/rust-lang/rust/pull/56245/
5088 [56365]: https://github.com/rust-lang/rust/pull/56365/
5089 [56366]: https://github.com/rust-lang/rust/pull/56366/
5090 [56395]: https://github.com/rust-lang/rust/pull/56395/
5091 [56759]: https://github.com/rust-lang/rust/pull/56759/
5092 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
5093 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
5094 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
5095 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
5096 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
5097 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5098 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5099 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
5100 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
5101 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
5102 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
5103 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
5104 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
5105 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
5106 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
5107 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
5108 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
5109 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
5110 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
5111 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
5112 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
5113 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
5114 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
5115 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
5116 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
5117 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
5118 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
5119 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
5120 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
5121 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
5122 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
5123 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
5124 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
5125 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
5126 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
5127 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
5128 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
5129 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
5130 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
5131 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
5132 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
5133 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
5134 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
5135 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
5136 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
5137 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
5138 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
5139 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
5140 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
5141 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
5142 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
5143 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
5144 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
5145 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
5146 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
5147 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
5148 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
5149 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
5150 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
5151 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
5152 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
5153 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
5154 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
5155 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
5156 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
5157 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
5158 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
5159 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
5160 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
5161 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
5162 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
5163 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
5164 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
5165 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
5166 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
5167 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
5168 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
5169 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
5170 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
5171 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
5172 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
5173 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
5174 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
5175 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
5176 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
5177 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
5178 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
5179 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
5180 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
5181 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
5182 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
5183 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
5184 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
5187 Version 1.31.1 (2018-12-20)
5188 ===========================
5190 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
5191 - [Fix broken go-to-definition in RLS][rls/1171]
5192 - [Fix infinite loop on hover in RLS][rls/1170]
5194 [56562]: https://github.com/rust-lang/rust/pull/56562
5195 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
5196 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
5198 Version 1.31.0 (2018-12-06)
5199 ==========================
5203 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
5204 - [New lifetime elision rules now allow for eliding lifetimes in functions and
5205 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
5206 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
5208 - [You can now define and use `const` functions.][54835] These are currently
5209 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
5210 [language reference][const-reference] for what exactly is available.
5211 - [You can now use tool lints, which allow you to scope lints from external
5212 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
5213 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
5214 a crate, not just in exported functions.][54451]
5215 - [You can now use parentheses in pattern matches.][54497]
5219 - [Updated musl to 1.1.20][54430]
5223 - [You can now convert `num::NonZero*` types to their raw equivalents using the
5224 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
5225 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
5226 into `Option<&mut T>` using the `From` trait.][53218]
5227 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
5232 - [`slice::align_to`]
5233 - [`slice::align_to_mut`]
5234 - [`slice::chunks_exact`]
5235 - [`slice::chunks_exact_mut`]
5236 - [`slice::rchunks`]
5237 - [`slice::rchunks_mut`]
5238 - [`slice::rchunks_exact`]
5239 - [`slice::rchunks_exact_mut`]
5240 - [`Option::replace`]
5244 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
5245 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
5246 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
5248 [52813]: https://github.com/rust-lang/rust/pull/52813/
5249 [53218]: https://github.com/rust-lang/rust/pull/53218/
5250 [54057]: https://github.com/rust-lang/rust/pull/54057/
5251 [54240]: https://github.com/rust-lang/rust/pull/54240/
5252 [54430]: https://github.com/rust-lang/rust/pull/54430/
5253 [54451]: https://github.com/rust-lang/rust/pull/54451/
5254 [54497]: https://github.com/rust-lang/rust/pull/54497/
5255 [54778]: https://github.com/rust-lang/rust/pull/54778/
5256 [54835]: https://github.com/rust-lang/rust/pull/54835/
5257 [54870]: https://github.com/rust-lang/rust/pull/54870/
5258 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
5259 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
5260 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
5261 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
5262 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
5263 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
5264 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5265 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
5266 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5267 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
5268 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
5269 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
5270 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
5271 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
5273 Version 1.30.1 (2018-11-08)
5274 ===========================
5276 - [Fixed overflow ICE in rustdoc][54199]
5277 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
5279 [54199]: https://github.com/rust-lang/rust/pull/54199
5280 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
5282 Version 1.30.0 (2018-10-25)
5283 ==========================
5287 - [Procedural macros are now available.][52081] These kinds of macros allow for
5288 more powerful code generation. There is a [new chapter available][proc-macros]
5289 in the Rust Programming Language book that goes further in depth.
5290 - [You can now use keywords as identifiers using the raw identifiers
5291 syntax (`r#`),][53236] e.g. `let r#for = true;`
5292 - [Using anonymous parameters in traits is now deprecated with a warning and
5293 will be a hard error in the 2018 edition.][53272]
5294 - [You can now use `crate` in paths.][54404] This allows you to refer to the
5295 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
5296 - [Using a external crate no longer requires being prefixed with `::`.][54404]
5297 Previously, using a external crate in a module without a use statement
5298 required `let json = ::serde_json::from_str(foo);` but can now be written
5299 as `let json = serde_json::from_str(foo);`.
5300 - [You can now apply the `#[used]` attribute to static items to prevent the
5301 compiler from optimising them away, even if they appear to be unused,][51363]
5302 e.g. `#[used] static FOO: u32 = 1;`
5303 - [You can now import and reexport macros from other crates with the `use`
5304 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5305 the root module of the crate. If your macro relies on calling other local
5306 macros, it is recommended to export with the
5307 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5309 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5310 using the `vis` specifier.][53370]
5311 - [Non-macro attributes now allow all forms of literals, not just
5312 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5313 write `#[attr(true)]`.
5314 - [You can now specify a function to handle a panic in the Rust runtime with the
5315 `#[panic_handler]` attribute.][51366]
5319 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5320 - [Added the `aarch64-unknown-netbsd` target][53165]
5321 - [Upgraded to LLVM 8.][53611]
5325 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5329 - [`Ipv4Addr::BROADCAST`]
5330 - [`Ipv4Addr::LOCALHOST`]
5331 - [`Ipv4Addr::UNSPECIFIED`]
5332 - [`Ipv6Addr::LOCALHOST`]
5333 - [`Ipv6Addr::UNSPECIFIED`]
5334 - [`Iterator::find_map`]
5336 The following methods are replacement methods for `trim_left`, `trim_right`,
5337 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5339 - [`str::trim_end_matches`]
5341 - [`str::trim_start_matches`]
5342 - [`str::trim_start`]
5346 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5347 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5348 equivalent to calling `rustdoc --error-format=json`.
5349 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5353 - [`rustdoc` allows you to specify what edition to treat your code as with the
5354 `--edition` option.][54057]
5355 - [`rustdoc` now has the `--color` (specify whether to output color) and
5356 `--error-format` (specify error format, e.g. `json`) options.][53003]
5357 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5358 debug symbols.][53774]
5359 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5360 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5362 [50911]: https://github.com/rust-lang/rust/pull/50911/
5363 [51363]: https://github.com/rust-lang/rust/pull/51363/
5364 [51366]: https://github.com/rust-lang/rust/pull/51366/
5365 [52081]: https://github.com/rust-lang/rust/pull/52081/
5366 [53003]: https://github.com/rust-lang/rust/pull/53003/
5367 [53033]: https://github.com/rust-lang/rust/pull/53033/
5368 [53044]: https://github.com/rust-lang/rust/pull/53044/
5369 [53165]: https://github.com/rust-lang/rust/pull/53165/
5370 [53611]: https://github.com/rust-lang/rust/pull/53611/
5371 [53236]: https://github.com/rust-lang/rust/pull/53236/
5372 [53272]: https://github.com/rust-lang/rust/pull/53272/
5373 [53370]: https://github.com/rust-lang/rust/pull/53370/
5374 [53459]: https://github.com/rust-lang/rust/pull/53459/
5375 [53774]: https://github.com/rust-lang/rust/pull/53774/
5376 [53822]: https://github.com/rust-lang/rust/pull/53822/
5377 [54057]: https://github.com/rust-lang/rust/pull/54057/
5378 [54404]: https://github.com/rust-lang/rust/pull/54404/
5379 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5380 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5381 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5382 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5384 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5385 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5386 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5387 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5388 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5389 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5390 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5391 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5392 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5393 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5396 Version 1.29.2 (2018-10-11)
5397 ===========================
5399 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5400 - The `rls-preview` component on the windows-gnu targets has been restored.
5402 [54639]: https://github.com/rust-lang/rust/pull/54639
5405 Version 1.29.1 (2018-09-25)
5406 ===========================
5411 - The standard library's `str::repeat` function contained an out of bounds write
5412 caused by an integer overflow. This has been fixed by deterministically
5413 panicking when an overflow happens.
5415 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5419 Version 1.29.0 (2018-09-13)
5420 ==========================
5424 - [Bumped minimum LLVM version to 5.0.][51899]
5425 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5426 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5427 - [Upgraded to LLVM 7.][51966]
5431 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5432 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5433 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5434 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5436 - [`Cell<T>` now allows `T` to be unsized.][50494]
5437 - [`SocketAddr` is now stable on Redox.][52656]
5442 - [`Iterator::flatten`]
5447 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5448 `--locked` to disable this behavior.
5449 - [`cargo-install` will now allow you to cross compile an install
5450 using `--target`.][cargo/5614]
5451 - [Added the `cargo-fix` subcommand to automatically move project code from
5452 2015 edition to 2018.][cargo/5723]
5453 - [`cargo doc` can now optionally document private types using the
5454 `--document-private-items` flag.][cargo/5543]
5458 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5459 the specified level to that level.][52354] For example `--cap-lints warn`
5460 will demote `deny` and `forbid` lints to `warn`.
5461 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5462 fails and `101` if there is a panic.][52197]
5463 - [A preview of clippy has been made available through rustup.][51122]
5464 You can install the preview with `rustup component add clippy-preview`.
5468 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5469 Use `str::get_unchecked(begin..end)` instead.
5470 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5471 Consider using the `home_dir` function from
5472 https://crates.io/crates/dirs instead.
5473 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5474 - [`cfg` attributes and `--cfg` command line flags are now more
5475 strictly validated.][53893]
5477 [53893]: https://github.com/rust-lang/rust/pull/53893/
5478 [52861]: https://github.com/rust-lang/rust/pull/52861/
5479 [51966]: https://github.com/rust-lang/rust/pull/51966/
5480 [52656]: https://github.com/rust-lang/rust/pull/52656/
5481 [52239]: https://github.com/rust-lang/rust/pull/52239/
5482 [52330]: https://github.com/rust-lang/rust/pull/52330/
5483 [52354]: https://github.com/rust-lang/rust/pull/52354/
5484 [52402]: https://github.com/rust-lang/rust/pull/52402/
5485 [52197]: https://github.com/rust-lang/rust/pull/52197/
5486 [51807]: https://github.com/rust-lang/rust/pull/51807/
5487 [51899]: https://github.com/rust-lang/rust/pull/51899/
5488 [51912]: https://github.com/rust-lang/rust/pull/51912/
5489 [51619]: https://github.com/rust-lang/rust/pull/51619/
5490 [51656]: https://github.com/rust-lang/rust/pull/51656/
5491 [51178]: https://github.com/rust-lang/rust/pull/51178/
5492 [51122]: https://github.com/rust-lang/rust/pull/51122
5493 [50494]: https://github.com/rust-lang/rust/pull/50494/
5494 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5495 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5496 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5497 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5498 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5499 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5500 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5503 Version 1.28.0 (2018-08-02)
5504 ===========================
5508 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5509 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5510 the inner type across Foreign Function Interface (FFI) boundaries.
5511 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5512 and can now be used as identifiers.][51196]
5513 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5514 stable.][51241] This will allow users to specify a global allocator for
5516 - [Unit test functions marked with the `#[test]` attribute can now return
5517 `Result<(), E: Debug>` in addition to `()`.][51298]
5518 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5519 allows macros to easily target lifetimes.
5523 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5524 prioritise making smaller binary sizes. `z` is the same as `s` with the
5525 exception that it does not vectorise loops, which typically results in an even
5527 - [The short error format is now stable.][49546] Specified with
5528 `--error-format=short` this option will provide a more compressed output of
5529 rust error messages.
5530 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5531 - [Reduced the number of allocations in the macro parser.][50855] This can
5532 improve compile times of macro heavy crates on average by 5%.
5536 - [Implemented `Default` for `&mut str`.][51306]
5537 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5538 - [Implemented `Extend` for `()`.][50234]
5539 - [The `Debug` implementation of `time::Duration` should now be more easily
5540 human readable.][50364] Previously a `Duration` of one second would printed as
5541 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5542 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5543 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5544 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5545 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5546 for `PathBuf`.][50170]
5547 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5548 and `Wrapping<i128>`.][50465]
5549 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5550 possible.][51050] This can provide up to a 40% speed increase.
5551 - [Improved error messages when using `format!`.][50610]
5555 - [`Iterator::step_by`]
5556 - [`Path::ancestors`]
5557 - [`SystemTime::UNIX_EPOCH`]
5558 - [`alloc::GlobalAlloc`]
5560 - [`alloc::LayoutErr`]
5563 - [`alloc::alloc_zeroed`]
5564 - [`alloc::dealloc`]
5565 - [`alloc::realloc`]
5566 - [`alloc::handle_alloc_error`]
5567 - [`btree_map::Entry::or_default`]
5568 - [`fmt::Alignment`]
5569 - [`hash_map::Entry::or_default`]
5570 - [`iter::repeat_with`]
5571 - [`num::NonZeroUsize`]
5572 - [`num::NonZeroU128`]
5573 - [`num::NonZeroU16`]
5574 - [`num::NonZeroU32`]
5575 - [`num::NonZeroU64`]
5576 - [`num::NonZeroU8`]
5577 - [`ops::RangeBounds`]
5578 - [`slice::SliceIndex`]
5579 - [`slice::from_mut`]
5580 - [`slice::from_ref`]
5581 - [`{Any + Send + Sync}::downcast_mut`]
5582 - [`{Any + Send + Sync}::downcast_ref`]
5583 - [`{Any + Send + Sync}::is`]
5587 - [Cargo will now no longer allow you to publish crates with build scripts that
5588 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5589 considered to be immutable.
5593 - [The `suggestion_applicability` field in `rustc`'s json output is now
5594 stable.][50486] This will allow dev tools to check whether a code suggestion
5595 would apply to them.
5599 - [Rust will consider trait objects with duplicated constraints to be the same
5600 type as without the duplicated constraint.][51276] For example the below code will
5601 now fail to compile.
5606 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5609 impl Trait + Send + Send {
5610 fn test(&self) { println!("two"); }
5614 [49546]: https://github.com/rust-lang/rust/pull/49546/
5615 [50143]: https://github.com/rust-lang/rust/pull/50143/
5616 [50170]: https://github.com/rust-lang/rust/pull/50170/
5617 [50234]: https://github.com/rust-lang/rust/pull/50234/
5618 [50265]: https://github.com/rust-lang/rust/pull/50265/
5619 [50364]: https://github.com/rust-lang/rust/pull/50364/
5620 [50385]: https://github.com/rust-lang/rust/pull/50385/
5621 [50465]: https://github.com/rust-lang/rust/pull/50465/
5622 [50486]: https://github.com/rust-lang/rust/pull/50486/
5623 [50554]: https://github.com/rust-lang/rust/pull/50554/
5624 [50610]: https://github.com/rust-lang/rust/pull/50610/
5625 [50855]: https://github.com/rust-lang/rust/pull/50855/
5626 [51050]: https://github.com/rust-lang/rust/pull/51050/
5627 [51196]: https://github.com/rust-lang/rust/pull/51196/
5628 [51241]: https://github.com/rust-lang/rust/pull/51241/
5629 [51276]: https://github.com/rust-lang/rust/pull/51276/
5630 [51298]: https://github.com/rust-lang/rust/pull/51298/
5631 [51306]: https://github.com/rust-lang/rust/pull/51306/
5632 [51562]: https://github.com/rust-lang/rust/pull/51562/
5633 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5634 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5635 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5636 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5637 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5638 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5639 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5640 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5641 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5642 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5643 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5644 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5645 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5646 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5647 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5648 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5649 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5650 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5651 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5652 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5653 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5654 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5655 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5656 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5657 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5658 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5659 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5660 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5661 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5662 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5664 Version 1.27.2 (2018-07-20)
5665 ===========================
5670 - The borrow checker was fixed to avoid potential unsoundness when using
5671 match ergonomics: [#52213][52213].
5673 [52213]: https://github.com/rust-lang/rust/issues/52213
5675 Version 1.27.1 (2018-07-10)
5676 ===========================
5681 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5682 when running, which enabled executing code as some other user on a
5683 given machine. This release fixes that vulnerability; you can read
5684 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5686 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5691 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5692 match ergonomics: [#51415][51415], [#49534][49534].
5694 [51415]: https://github.com/rust-lang/rust/issues/51415
5695 [49534]: https://github.com/rust-lang/rust/issues/49534
5696 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5697 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5699 Version 1.27.0 (2018-06-21)
5700 ==========================
5704 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5705 be used as an identifier.
5706 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5707 bare `Trait` syntax, and should make it clearer when being used in tandem with
5708 `impl Trait` because it is equivalent to the following syntax:
5709 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5710 `Box<Trait> == Box<dyn Trait>`.
5711 - [Attributes on generic parameters such as types and lifetimes are
5712 now stable.][48851] e.g.
5713 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5714 - [The `#[must_use]` attribute can now also be used on functions as well as
5715 types.][48925] It provides a lint that by default warns users when the
5716 value returned by a function has not been used.
5720 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5724 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5725 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5726 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5727 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5728 the `cfg` attribute.
5729 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5730 std are now available in core.][49896]
5731 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5733 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5734 that the operation isn't done in place.
5735 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5736 the `#[must_use]` attribute][49533] to warn about unused potentially
5737 expensive allocations.
5741 - [`DoubleEndedIterator::rfind`]
5742 - [`DoubleEndedIterator::rfold`]
5743 - [`DoubleEndedIterator::try_rfold`]
5744 - [`Duration::from_micros`]
5745 - [`Duration::from_nanos`]
5746 - [`Duration::subsec_micros`]
5747 - [`Duration::subsec_millis`]
5748 - [`HashMap::remove_entry`]
5749 - [`Iterator::try_fold`]
5750 - [`Iterator::try_for_each`]
5752 - [`Option::filter`]
5753 - [`String::replace_range`]
5754 - [`Take::set_limit`]
5755 - [`hint::unreachable_unchecked`]
5756 - [`os::unix::process::parent_id`]
5757 - [`ptr::swap_nonoverlapping`]
5758 - [`slice::rsplit_mut`]
5760 - [`slice::swap_with_slice`]
5764 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5765 `readme`, and `repository` fields.][cargo/5386]
5766 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5767 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5768 a different directory than `target` for placing compilation artifacts.
5769 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5770 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5771 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5772 where cargo would infer a binary, Cargo will produce a warning. You can
5773 disable this feature ahead of time by setting any of the following to false:
5774 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5775 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5776 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5780 - [Added “The Rustc book” into the official documentation.][49707]
5781 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5782 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5786 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5787 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5788 compile, `"".is_empty()` will still compile.
5789 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5790 will only print the inner type.][48553] E.g.
5791 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5792 not `AtomicBool(true)`.
5793 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5794 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5795 alignment should cover all use cases.
5796 - The `.description()` method on the `std::error::Error` trait
5797 [has been soft-deprecated][50163]. It is no longer required to implement it.
5799 [48553]: https://github.com/rust-lang/rust/pull/48553/
5800 [48851]: https://github.com/rust-lang/rust/pull/48851/
5801 [48925]: https://github.com/rust-lang/rust/pull/48925/
5802 [49533]: https://github.com/rust-lang/rust/pull/49533/
5803 [49623]: https://github.com/rust-lang/rust/pull/49623/
5804 [49630]: https://github.com/rust-lang/rust/pull/49630/
5805 [49664]: https://github.com/rust-lang/rust/pull/49664/
5806 [49699]: https://github.com/rust-lang/rust/pull/49699/
5807 [49707]: https://github.com/rust-lang/rust/pull/49707/
5808 [49896]: https://github.com/rust-lang/rust/pull/49896/
5809 [49968]: https://github.com/rust-lang/rust/pull/49968/
5810 [50163]: https://github.com/rust-lang/rust/pull/50163
5811 [50177]: https://github.com/rust-lang/rust/pull/50177/
5812 [50378]: https://github.com/rust-lang/rust/pull/50378/
5813 [50423]: https://github.com/rust-lang/rust/pull/50423/
5814 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5815 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5816 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5817 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5818 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5819 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5820 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5821 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5822 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5823 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5824 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5825 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5826 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5827 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5828 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5829 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5830 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5831 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5832 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5833 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5834 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5835 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5836 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5837 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5838 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5839 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5840 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5841 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5842 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5845 Version 1.26.2 (2018-06-05)
5846 ==========================
5851 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5853 [51117]: https://github.com/rust-lang/rust/issues/51117
5856 Version 1.26.1 (2018-05-29)
5857 ==========================
5862 - [RLS now works on Windows.][50646]
5863 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5869 - [`fn main() -> impl Trait` no longer works for non-Termination
5871 This reverts an accidental stabilization.
5872 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5873 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5875 [50646]: https://github.com/rust-lang/rust/issues/50646
5876 [50656]: https://github.com/rust-lang/rust/pull/50656
5877 [50812]: https://github.com/rust-lang/rust/pull/50812
5878 [50950]: https://github.com/rust-lang/rust/issues/50950
5879 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5881 Version 1.26.0 (2018-05-10)
5882 ==========================
5886 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5887 implement either or both traits.][49299]
5888 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5889 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5890 lifetime can be elided.][49458]
5891 - [`impl Trait` is now stable allowing you to have abstract types in returns
5892 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5893 `fn open(path: impl AsRef<Path>)`.
5894 - [Pattern matching will now automatically apply dereferences.][49394]
5895 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5896 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5897 - [A lot of operations are now available in a const context.][46882] E.g. You
5898 can now index into constant arrays, reference and dereference into constants,
5899 and use tuple struct constructors.
5900 - [Fixed entry slice patterns are now stable.][48516] E.g.
5902 let points = [1, 2, 3, 4];
5904 [1, 2, 3, 4] => println!("All points were sequential."),
5905 _ => println!("Not all points were sequential."),
5912 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5913 - [Fixed exponential projection complexity on nested types.][48296]
5914 This can provide up to a ~12% reduction in compile times for certain crates.
5915 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5916 to remap path prefixes outputted by the compiler.
5917 - [Added `powerpc-unknown-netbsd` target.][48281]
5921 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5922 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5923 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5924 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5925 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5926 - [`ascii::escape_default` is now available in libcore.][48735]
5927 - [Trailing commas are now supported in std and core macros.][48056]
5928 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5929 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5934 - [`*const T::copy_to_nonoverlapping`]
5935 - [`*const T::copy_to`]
5936 - [`*const T::read_unaligned`]
5937 - [`*const T::read_volatile`]
5938 - [`*const T::read`]
5940 - [`*const T::wrapping_add`]
5941 - [`*const T::wrapping_sub`]
5943 - [`*mut T::copy_to_nonoverlapping`]
5944 - [`*mut T::copy_to`]
5945 - [`*mut T::read_unaligned`]
5946 - [`*mut T::read_volatile`]
5948 - [`*mut T::replace`]
5951 - [`*mut T::wrapping_add`]
5952 - [`*mut T::wrapping_sub`]
5953 - [`*mut T::write_bytes`]
5954 - [`*mut T::write_unaligned`]
5955 - [`*mut T::write_volatile`]
5958 - [`FromUtf8Error::as_bytes`]
5959 - [`LocalKey::try_with`]
5960 - [`Option::cloned`]
5961 - [`btree_map::Entry::and_modify`]
5962 - [`fs::read_to_string`]
5965 - [`hash_map::Entry::and_modify`]
5966 - [`iter::FusedIterator`]
5967 - [`ops::RangeInclusive`]
5968 - [`ops::RangeToInclusive`]
5970 - [`slice::rotate_left`]
5971 - [`slice::rotate_right`]
5972 - [`String::retain`]
5977 - [Cargo will now output path to custom commands when `-v` is
5978 passed with `--list`][cargo/5041]
5979 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5983 - [The second edition of "The Rust Programming Language" book is now recommended
5984 over the first.][48404]
5989 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5990 syntax is now invalid.
5992 use std::ops::Fn as dyn;
5993 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5995 - [The result of dereferences are no longer promoted to `'static`.][47408]
5999 const PAIR: &(i32, i32) = &(0, 1);
6000 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
6003 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
6004 - [`".e0"` will now no longer parse as `0.0` and will instead cause
6006 - [Removed hoedown from rustdoc.][48274]
6007 - [Bounds on higher-kinded lifetimes a hard error.][48326]
6009 [46882]: https://github.com/rust-lang/rust/pull/46882
6010 [47379]: https://github.com/rust-lang/rust/pull/47379
6011 [47408]: https://github.com/rust-lang/rust/pull/47408
6012 [47813]: https://github.com/rust-lang/rust/pull/47813
6013 [48056]: https://github.com/rust-lang/rust/pull/48056
6014 [48125]: https://github.com/rust-lang/rust/pull/48125
6015 [48235]: https://github.com/rust-lang/rust/pull/48235
6016 [48274]: https://github.com/rust-lang/rust/pull/48274
6017 [48281]: https://github.com/rust-lang/rust/pull/48281
6018 [48296]: https://github.com/rust-lang/rust/pull/48296
6019 [48326]: https://github.com/rust-lang/rust/pull/48326
6020 [48359]: https://github.com/rust-lang/rust/pull/48359
6021 [48404]: https://github.com/rust-lang/rust/pull/48404
6022 [48481]: https://github.com/rust-lang/rust/pull/48481
6023 [48516]: https://github.com/rust-lang/rust/pull/48516
6024 [48628]: https://github.com/rust-lang/rust/pull/48628
6025 [48629]: https://github.com/rust-lang/rust/pull/48629
6026 [48657]: https://github.com/rust-lang/rust/pull/48657
6027 [48735]: https://github.com/rust-lang/rust/pull/48735
6028 [48978]: https://github.com/rust-lang/rust/pull/48978
6029 [49101]: https://github.com/rust-lang/rust/pull/49101
6030 [49109]: https://github.com/rust-lang/rust/pull/49109
6031 [49162]: https://github.com/rust-lang/rust/pull/49162
6032 [49255]: https://github.com/rust-lang/rust/pull/49255
6033 [49299]: https://github.com/rust-lang/rust/pull/49299
6034 [49305]: https://github.com/rust-lang/rust/pull/49305
6035 [49394]: https://github.com/rust-lang/rust/pull/49394
6036 [49458]: https://github.com/rust-lang/rust/pull/49458
6037 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
6038 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
6039 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
6040 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
6041 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
6042 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
6043 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
6044 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
6045 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
6046 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
6047 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
6048 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
6049 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
6050 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
6051 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
6052 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
6053 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
6054 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
6055 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
6056 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
6057 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
6058 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
6059 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
6060 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
6061 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
6062 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
6063 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
6064 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
6065 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
6066 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
6067 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
6068 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
6069 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
6070 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
6071 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
6072 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
6073 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
6074 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
6075 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
6076 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
6077 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
6078 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
6081 Version 1.25.0 (2018-03-29)
6082 ==========================
6086 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
6087 - [You can now use nested groups of imports.][47948]
6088 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
6089 - [You can now have `|` at the start of a match arm.][47947] e.g.
6091 enum Foo { A, B, C }
6097 | Foo::B => println!("AB"),
6098 | Foo::C => println!("C"),
6105 - [Upgraded to LLVM 6.][47828]
6106 - [Added `-C lto=val` option.][47521]
6107 - [Added `i586-unknown-linux-musl` target][47282]
6111 - [Impl Send for `process::Command` on Unix.][47760]
6112 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
6113 - [`UnsafeCell::into_inner` is now safe.][47204]
6114 - [Implement libstd for CloudABI.][47268]
6115 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
6116 - [Implement `AsRef<Path>` for Component][46985]
6117 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
6118 - [Moved `Duration` to libcore.][46666]
6122 - [`Location::column`]
6125 The following functions can now be used in a constant expression.
6126 eg. `static MINUTE: Duration = Duration::from_secs(60);`
6127 - [`Duration::new`][47300]
6128 - [`Duration::from_secs`][47300]
6129 - [`Duration::from_millis`][47300]
6133 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
6134 - [`cargo new` now defaults to creating a binary crate, instead of a
6135 library crate.][cargo/5029]
6139 - [Rust by example is now shipped with new releases][46196]
6143 - [Deprecated `net::lookup_host`.][47510]
6144 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
6145 - The borrow checker was sometimes incorrectly permitting overlapping borrows
6146 around indexing operations (see [#47349][47349]). This has been fixed (which also
6147 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
6148 - [Removed deprecated unstable attribute `#[simd]`.][47251]
6150 [33903]: https://github.com/rust-lang/rust/pull/33903
6151 [47947]: https://github.com/rust-lang/rust/pull/47947
6152 [47948]: https://github.com/rust-lang/rust/pull/47948
6153 [47760]: https://github.com/rust-lang/rust/pull/47760
6154 [47790]: https://github.com/rust-lang/rust/pull/47790
6155 [47828]: https://github.com/rust-lang/rust/pull/47828
6156 [47398]: https://github.com/rust-lang/rust/pull/47398
6157 [47510]: https://github.com/rust-lang/rust/pull/47510
6158 [47521]: https://github.com/rust-lang/rust/pull/47521
6159 [47204]: https://github.com/rust-lang/rust/pull/47204
6160 [47251]: https://github.com/rust-lang/rust/pull/47251
6161 [47268]: https://github.com/rust-lang/rust/pull/47268
6162 [47282]: https://github.com/rust-lang/rust/pull/47282
6163 [47300]: https://github.com/rust-lang/rust/pull/47300
6164 [47349]: https://github.com/rust-lang/rust/pull/47349
6165 [46931]: https://github.com/rust-lang/rust/pull/46931
6166 [46985]: https://github.com/rust-lang/rust/pull/46985
6167 [47006]: https://github.com/rust-lang/rust/pull/47006
6168 [46830]: https://github.com/rust-lang/rust/pull/46830
6169 [46095]: https://github.com/rust-lang/rust/pull/46095
6170 [46666]: https://github.com/rust-lang/rust/pull/46666
6171 [46196]: https://github.com/rust-lang/rust/pull/46196
6172 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
6173 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
6174 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
6175 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
6176 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
6179 Version 1.24.1 (2018-03-01)
6180 ==========================
6182 - [Do not abort when unwinding through FFI][48251]
6183 - [Emit UTF-16 files for linker arguments on Windows][48318]
6184 - [Make the error index generator work again][48308]
6185 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
6187 [48251]: https://github.com/rust-lang/rust/issues/48251
6188 [48308]: https://github.com/rust-lang/rust/issues/48308
6189 [48318]: https://github.com/rust-lang/rust/issues/48318
6190 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
6193 Version 1.24.0 (2018-02-15)
6194 ==========================
6198 - [External `sysv64` ffi is now available.][46528]
6199 eg. `extern "sysv64" fn foo () {}`
6203 - [rustc now uses 16 codegen units by default for release builds.][46910]
6204 For the fastest builds, utilize `codegen-units=1`.
6205 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
6206 - [Add `aarch64-unknown-openbsd` support][46760]
6210 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
6211 improvement in performance in the majority of cases.
6212 - [`OsStr`'s `Debug` implementation is now lossless and consistent
6213 with Windows.][46798]
6214 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
6215 - [impl `From<bool>` for `AtomicBool`][46293]
6216 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
6217 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
6218 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
6219 - [float::from_bits now just uses transmute.][46012] This provides
6220 some optimisations from LLVM.
6221 - [Copied `AsciiExt` methods onto `char`][46077]
6222 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
6223 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
6224 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
6225 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
6229 - [`RefCell::replace`]
6231 - [`atomic::spin_loop_hint`]
6233 The following functions can now be used in a constant expression.
6234 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
6236 - [`AtomicBool::new`][46287]
6237 - [`AtomicUsize::new`][46287]
6238 - [`AtomicIsize::new`][46287]
6239 - [`AtomicPtr::new`][46287]
6240 - [`Cell::new`][46287]
6241 - [`{integer}::min_value`][46287]
6242 - [`{integer}::max_value`][46287]
6243 - [`mem::size_of`][46287]
6244 - [`mem::align_of`][46287]
6245 - [`ptr::null`][46287]
6246 - [`ptr::null_mut`][46287]
6247 - [`RefCell::new`][46287]
6248 - [`UnsafeCell::new`][46287]
6252 - [Added a `workspace.default-members` config that
6253 overrides implied `--all` in virtual workspaces.][cargo/4743]
6254 - [Enable incremental by default on development builds.][cargo/4817] Also added
6255 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
6256 per-project or global basis respectively.
6263 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
6264 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
6265 in accordance with IETF RFC 4291 §2.2.
6266 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
6267 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
6268 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
6269 - [Leading zeros in tuple struct members is now an error][47084]
6270 - [`column!()` macro is one-based instead of zero-based][46977]
6271 - [`fmt::Arguments` can no longer be shared across threads][45198]
6272 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
6273 - [Cargo sets a different working directory for the compiler][cargo/4788]
6275 [44884]: https://github.com/rust-lang/rust/pull/44884
6276 [45198]: https://github.com/rust-lang/rust/pull/45198
6277 [45506]: https://github.com/rust-lang/rust/pull/45506
6278 [45990]: https://github.com/rust-lang/rust/pull/45990
6279 [46012]: https://github.com/rust-lang/rust/pull/46012
6280 [46077]: https://github.com/rust-lang/rust/pull/46077
6281 [46094]: https://github.com/rust-lang/rust/pull/46094
6282 [46284]: https://github.com/rust-lang/rust/pull/46284
6283 [46287]: https://github.com/rust-lang/rust/pull/46287
6284 [46293]: https://github.com/rust-lang/rust/pull/46293
6285 [46528]: https://github.com/rust-lang/rust/pull/46528
6286 [46671]: https://github.com/rust-lang/rust/pull/46671
6287 [46713]: https://github.com/rust-lang/rust/pull/46713
6288 [46735]: https://github.com/rust-lang/rust/pull/46735
6289 [46760]: https://github.com/rust-lang/rust/pull/46760
6290 [46798]: https://github.com/rust-lang/rust/pull/46798
6291 [46828]: https://github.com/rust-lang/rust/pull/46828
6292 [46831]: https://github.com/rust-lang/rust/pull/46831
6293 [46833]: https://github.com/rust-lang/rust/pull/46833
6294 [46910]: https://github.com/rust-lang/rust/pull/46910
6295 [46977]: https://github.com/rust-lang/rust/pull/46977
6296 [47018]: https://github.com/rust-lang/rust/pull/47018
6297 [47080]: https://github.com/rust-lang/rust/pull/47080
6298 [47084]: https://github.com/rust-lang/rust/pull/47084
6299 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6300 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6301 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6302 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6303 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6304 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6307 Version 1.23.0 (2018-01-04)
6308 ==========================
6312 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6313 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6314 Which should fix some confusing errors in some operations.
6318 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6319 undefined behavior.][45920]
6320 - [rustc now suggests renaming import if names clash.][45660]
6321 - [Display errors/warnings correctly when there are zero-width or
6322 wide characters.][45711]
6323 - [rustc now avoids unnecessary copies of arguments that are
6324 simple bindings][45380] This should improve memory usage on average by 5-10%.
6325 - [Updated musl used to build musl rustc to 1.1.17][45393]
6329 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6330 - [Implement Hash for raw pointers to unsized types][45483]
6331 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6332 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6333 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6334 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6335 and `<*mut T>::as_mut`][44932]
6336 - [Optimized `Thread::{park, unpark}` implementation][45524]
6337 - [Improved `SliceExt::binary_search` performance.][45333]
6338 - [impl `FromIterator<()>` for `()`][45379]
6339 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6347 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6348 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6349 - [Added unit test checking to `cargo check`][cargo/4592]
6350 - [Cargo now lets you install a specific version
6351 using `cargo install --version`][cargo/4637]
6355 - [Releases now ship with the Cargo book documentation.][45692]
6356 - [rustdoc now prints rendering warnings on every run.][45324]
6360 - [Changes have been made to type equality to make it more correct,
6361 in rare cases this could break some code.][45853] [Tracking issue for
6362 further information][45852]
6363 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6364 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6365 Android 9, the minimum supported version is Android 14.
6366 - [Bumped the minimum LLVM to 3.9][45326]
6368 [44042]: https://github.com/rust-lang/rust/pull/44042
6369 [44932]: https://github.com/rust-lang/rust/pull/44932
6370 [45267]: https://github.com/rust-lang/rust/pull/45267
6371 [45324]: https://github.com/rust-lang/rust/pull/45324
6372 [45326]: https://github.com/rust-lang/rust/pull/45326
6373 [45333]: https://github.com/rust-lang/rust/pull/45333
6374 [45379]: https://github.com/rust-lang/rust/pull/45379
6375 [45380]: https://github.com/rust-lang/rust/pull/45380
6376 [45393]: https://github.com/rust-lang/rust/pull/45393
6377 [45435]: https://github.com/rust-lang/rust/pull/45435
6378 [45483]: https://github.com/rust-lang/rust/pull/45483
6379 [45524]: https://github.com/rust-lang/rust/pull/45524
6380 [45571]: https://github.com/rust-lang/rust/pull/45571
6381 [45580]: https://github.com/rust-lang/rust/pull/45580
6382 [45610]: https://github.com/rust-lang/rust/pull/45610
6383 [45660]: https://github.com/rust-lang/rust/pull/45660
6384 [45692]: https://github.com/rust-lang/rust/pull/45692
6385 [45711]: https://github.com/rust-lang/rust/pull/45711
6386 [45772]: https://github.com/rust-lang/rust/pull/45772
6387 [45852]: https://github.com/rust-lang/rust/issues/45852
6388 [45853]: https://github.com/rust-lang/rust/pull/45853
6389 [45887]: https://github.com/rust-lang/rust/pull/45887
6390 [45920]: https://github.com/rust-lang/rust/pull/45920
6391 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6392 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6393 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6396 Version 1.22.1 (2017-11-22)
6397 ==========================
6399 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6401 [46183]: https://github.com/rust-lang/rust/pull/46183
6403 Version 1.22.0 (2017-11-22)
6404 ==========================
6408 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6409 - [Now accepts underscores in unicode escapes][43716]
6410 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6411 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6415 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6416 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6417 This should decrease compile times for debug builds.
6418 - [strict memory alignment now enabled on ARMv6][45094]
6419 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6423 - [Allow atomic operations up to 32 bits
6424 on `armv5te_unknown_linux_gnueabi`][44978]
6425 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6426 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6427 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6428 - [Properly detect overflow in `Instant += Duration`.][44220]
6429 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6430 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6431 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6438 - [Cargo will now build multi file examples in subdirectories of the `examples`
6439 folder that have a `main.rs` file.][cargo/4496]
6440 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6441 the old format will continue to work and can be updated with `cargo update`.
6442 - [Now supports vendoring git repositories][cargo/3992]
6446 - [`libbacktrace` is now available on Apple platforms.][44251]
6447 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6448 This now lets you specify that a given code example will fail to compile.
6452 - [The minimum Android version that rustc can build for has been bumped
6453 to `4.0` from `2.3`][45656]
6454 - [Allowing `T op= &T` for numeric types has broken some type
6455 inference cases][45480]
6458 [42526]: https://github.com/rust-lang/rust/pull/42526
6459 [43716]: https://github.com/rust-lang/rust/pull/43716
6460 [43949]: https://github.com/rust-lang/rust/pull/43949
6461 [44015]: https://github.com/rust-lang/rust/pull/44015
6462 [44220]: https://github.com/rust-lang/rust/pull/44220
6463 [44251]: https://github.com/rust-lang/rust/pull/44251
6464 [44287]: https://github.com/rust-lang/rust/pull/44287
6465 [44303]: https://github.com/rust-lang/rust/pull/44303
6466 [44456]: https://github.com/rust-lang/rust/pull/44456
6467 [44466]: https://github.com/rust-lang/rust/pull/44466
6468 [44895]: https://github.com/rust-lang/rust/pull/44895
6469 [44966]: https://github.com/rust-lang/rust/pull/44966
6470 [44978]: https://github.com/rust-lang/rust/pull/44978
6471 [45041]: https://github.com/rust-lang/rust/pull/45041
6472 [45064]: https://github.com/rust-lang/rust/pull/45064
6473 [45075]: https://github.com/rust-lang/rust/pull/45075
6474 [45094]: https://github.com/rust-lang/rust/pull/45094
6475 [45095]: https://github.com/rust-lang/rust/pull/45095
6476 [45480]: https://github.com/rust-lang/rust/issues/45480
6477 [45656]: https://github.com/rust-lang/rust/pull/45656
6478 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6479 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6480 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6487 Version 1.21.0 (2017-10-12)
6488 ==========================
6492 - [You can now use static references for literals.][43838]
6496 let x: &'static u32 = &0;
6499 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6502 my_macro!(Vec<i32>::new); // Always worked
6503 my_macro!(Vec::<i32>::new); // Now works
6508 - [Upgraded jemalloc to 4.5.0][43911]
6509 - [Enabled unwinding panics on Redox][43917]
6510 - [Now runs LLVM in parallel during translation phase.][43506]
6511 This should reduce peak memory usage.
6515 - [Generate builtin impls for `Clone` for all arrays and tuples that
6516 are `T: Clone`][43690]
6517 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6518 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6519 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6524 [`std::mem::discriminant`]
6528 - [You can now call `cargo install` with multiple package names][cargo/4216]
6529 - [Cargo commands inside a virtual workspace will now implicitly
6530 pass `--all`][cargo/4335]
6531 - [Added a `[patch]` section to `Cargo.toml` to handle
6532 prepublication dependencies][cargo/4123] [RFC 1969]
6533 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6534 like patterns][cargo/4270]
6535 - [Added the `--all-targets` option][cargo/4400]
6536 - [Using required dependencies as a feature is now deprecated and emits
6537 a warning][cargo/4364]
6542 - [Cargo docs are moving][43916]
6543 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6544 - [The rustdoc book is now available][43863]
6545 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6546 - [Added a preview of RLS has been made available through rustup][44204]
6547 Install with `rustup component add rls-preview`
6548 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6549 Previously only showed `std::os::unix`.
6553 - [Changes in method matching against higher-ranked types][43880] This may cause
6554 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6555 - [rustc's JSON error output's byte position start at top of file.][42973]
6556 Was previously relative to the rustc's internal `CodeMap` struct which
6557 required the unstable library `libsyntax` to correctly use.
6558 - [`unused_results` lint no longer ignores booleans][43728]
6560 [42565]: https://github.com/rust-lang/rust/pull/42565
6561 [42973]: https://github.com/rust-lang/rust/pull/42973
6562 [43348]: https://github.com/rust-lang/rust/pull/43348
6563 [43459]: https://github.com/rust-lang/rust/pull/43459
6564 [43506]: https://github.com/rust-lang/rust/pull/43506
6565 [43540]: https://github.com/rust-lang/rust/pull/43540
6566 [43690]: https://github.com/rust-lang/rust/pull/43690
6567 [43728]: https://github.com/rust-lang/rust/pull/43728
6568 [43838]: https://github.com/rust-lang/rust/pull/43838
6569 [43863]: https://github.com/rust-lang/rust/pull/43863
6570 [43880]: https://github.com/rust-lang/rust/pull/43880
6571 [43911]: https://github.com/rust-lang/rust/pull/43911
6572 [43916]: https://github.com/rust-lang/rust/pull/43916
6573 [43917]: https://github.com/rust-lang/rust/pull/43917
6574 [44204]: https://github.com/rust-lang/rust/pull/44204
6575 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6576 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6577 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6578 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6579 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6580 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6581 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6582 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6583 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6585 Version 1.20.0 (2017-08-31)
6586 ===========================
6590 - [Associated constants are now stabilised.][42809]
6591 - [A lot of macro bugs are now fixed.][42913]
6596 - [Struct fields are now properly coerced to the expected field type.][42807]
6597 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6598 `wasm32-experimental-emscripten` target.
6599 - [Changed some of the error messages to be more helpful.][42033]
6600 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6602 - [rustc now reports the total number of errors on compilation failure][43015]
6603 previously this was only the number of errors in the pass that failed.
6604 - [Expansion in rustc has been sped up 29x.][42533]
6605 - [added `msp430-none-elf` target.][43099]
6606 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6608 - [Fixes backtraces on Redox][43228]
6609 - [rustc now identifies different versions of same crate when absolute paths of
6610 different types match in an error message.][42826]
6616 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6617 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6619 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6620 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6621 - [Impl `Clone` for `DefaultHasher`.][42799]
6622 - [Impl `Sync` for `SyncSender`.][42397]
6623 - [Impl `FromStr` for `char`][42271]
6624 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6626 - [allow messages in the `unimplemented!()` macro.][42155]
6627 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6628 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6629 - [Upgrade to Unicode 10.0.0][42999]
6630 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6631 - [Skip the main thread's manual stack guard on Linux][43072]
6632 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6633 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6635 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6640 - [`CStr::into_c_string`]
6641 - [`CString::as_c_str`]
6642 - [`CString::into_boxed_c_str`]
6643 - [`Chain::get_mut`]
6644 - [`Chain::get_ref`]
6645 - [`Chain::into_inner`]
6646 - [`Option::get_or_insert_with`]
6647 - [`Option::get_or_insert`]
6648 - [`OsStr::into_os_string`]
6649 - [`OsString::into_boxed_os_str`]
6652 - [`Utf8Error::error_len`]
6653 - [`char::EscapeDebug`]
6654 - [`char::escape_debug`]
6655 - [`compile_error!`]
6656 - [`f32::from_bits`]
6658 - [`f64::from_bits`]
6660 - [`mem::ManuallyDrop`]
6661 - [`slice::sort_unstable_by_key`]
6662 - [`slice::sort_unstable_by`]
6663 - [`slice::sort_unstable`]
6664 - [`str::from_boxed_utf8_unchecked`]
6665 - [`str::as_bytes_mut`]
6666 - [`str::as_bytes_mut`]
6667 - [`str::from_utf8_mut`]
6668 - [`str::from_utf8_unchecked_mut`]
6670 - [`str::get_unchecked_mut`]
6671 - [`str::get_unchecked`]
6673 - [`str::into_boxed_bytes`]
6678 - [Cargo API token location moved from `~/.cargo/config` to
6679 `~/.cargo/credentials`.][cargo/3978]
6680 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6681 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6682 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6683 - [You can now specify version of a binary when installed through
6684 `cargo install` using `--vers`.][cargo/4229]
6685 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6686 failure.][cargo/4248]
6687 - [Changed the convention around which file is the crate root.][cargo/4259]
6692 - [Functions with `'static` in their return types will now not be as usable as
6693 if they were using lifetime parameters instead.][42417]
6694 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6695 takes the sign of NaN into account where previously didn't.][42430]
6697 [42033]: https://github.com/rust-lang/rust/pull/42033
6698 [42155]: https://github.com/rust-lang/rust/pull/42155
6699 [42271]: https://github.com/rust-lang/rust/pull/42271
6700 [42397]: https://github.com/rust-lang/rust/pull/42397
6701 [42417]: https://github.com/rust-lang/rust/pull/42417
6702 [42430]: https://github.com/rust-lang/rust/pull/42430
6703 [42431]: https://github.com/rust-lang/rust/pull/42431
6704 [42533]: https://github.com/rust-lang/rust/pull/42533
6705 [42571]: https://github.com/rust-lang/rust/pull/42571
6706 [42613]: https://github.com/rust-lang/rust/pull/42613
6707 [42799]: https://github.com/rust-lang/rust/pull/42799
6708 [42807]: https://github.com/rust-lang/rust/pull/42807
6709 [42809]: https://github.com/rust-lang/rust/pull/42809
6710 [42822]: https://github.com/rust-lang/rust/pull/42822
6711 [42826]: https://github.com/rust-lang/rust/pull/42826
6712 [42854]: https://github.com/rust-lang/rust/pull/42854
6713 [42913]: https://github.com/rust-lang/rust/pull/42913
6714 [42999]: https://github.com/rust-lang/rust/pull/42999
6715 [43011]: https://github.com/rust-lang/rust/pull/43011
6716 [43015]: https://github.com/rust-lang/rust/pull/43015
6717 [43072]: https://github.com/rust-lang/rust/pull/43072
6718 [43077]: https://github.com/rust-lang/rust/pull/43077
6719 [43097]: https://github.com/rust-lang/rust/pull/43097
6720 [43099]: https://github.com/rust-lang/rust/pull/43099
6721 [43170]: https://github.com/rust-lang/rust/pull/43170
6722 [43178]: https://github.com/rust-lang/rust/pull/43178
6723 [43185]: https://github.com/rust-lang/rust/pull/43185
6724 [43228]: https://github.com/rust-lang/rust/pull/43228
6725 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6726 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6727 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6728 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6729 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6730 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6731 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6732 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6733 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6734 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6735 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6736 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6737 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6738 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6739 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6740 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6741 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6742 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6743 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6744 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6745 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6746 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6747 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6748 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6749 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6750 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6751 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6752 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6753 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6754 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6755 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6756 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6757 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6758 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6759 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6760 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6761 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6762 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6765 Version 1.19.0 (2017-07-20)
6766 ===========================
6771 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6772 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6773 - [Macro recursion limit increased to 1024 from 64.][41676]
6774 - [Added lint for detecting unused macros.][41907]
6775 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6776 For example: `let x = loop { break 7; };`
6777 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6778 contain `Copy` types and cannot have a `Drop` implementation.
6779 Example: `union Foo { bar: u8, baz: usize }`
6780 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6781 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6786 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6787 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6788 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6789 you should use `--target armv7-linux-androideabi`.
6790 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6791 - [Minor optimisation of string operations.][42037]
6792 - [Compiler error message is now `aborting due to previous error(s)` instead of
6793 `aborting due to N previous errors`][42150] This was previously inaccurate and
6794 would only count certain kinds of errors.
6795 - [The compiler now supports Visual Studio 2017][42225]
6796 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6797 - [Added a lot][42264] of [new error codes][42302]
6798 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6799 libraries with C Run-time Libraries(CRT) to be statically linked.
6800 - [Fixed various ARM codegen bugs][42740]
6805 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6806 `Extend<Cow<'a, str>>`][41449]
6807 - [`Vec` now implements `From<&mut [T]>`][41530]
6808 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6809 - [`SplitWhitespace` now implements `Clone`][41659]
6810 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6812 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6813 macros, but for printing to stderr.
6818 - [`OsString::shrink_to_fit`]
6821 - [`thread::ThreadId`]
6826 - [Build scripts can now add environment variables to the environment
6827 the crate is being compiled in.
6828 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6829 - [Subcommands now replace the current process rather than spawning a new
6830 child process][cargo/3970]
6831 - [Workspace members can now accept glob file patterns][cargo/3979]
6832 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6833 the members in a given workspace.][cargo/3988]
6834 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6835 - [Target directory path is now in the cargo metadata][cargo/4022]
6836 - [Cargo no longer checks out a local working directory for the
6837 crates.io index][cargo/4026] This should provide smaller file size for the
6838 registry, and improve cloning times, especially on Windows machines.
6839 - [Added an `--exclude` option for excluding certain packages when using the
6840 `--all` option][cargo/4031]
6841 - [Cargo will now automatically retry when receiving a 5xx error
6842 from crates.io][cargo/4032]
6843 - [The `--features` option now accepts multiple comma or space
6844 delimited values.][cargo/4084]
6845 - [Added support for custom target specific runners][cargo/3954]
6850 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6852 - [Rust will now release XZ compressed packages][rust-installer/57]
6853 - [rustup will now prefer to download rust packages with
6854 XZ compression][rustup/1100] over GZip packages.
6855 - [Added the ability to escape `#` in rust documentation][41785] By adding
6856 additional `#`'s ie. `##` is now `#`
6861 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6862 - [`-Z` flags are now no longer allowed to be used on the stable
6863 compiler.][41751] This has been a warning for a year previous to this.
6864 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6865 longer works][42844]. Users should migrate to the built-in `check`
6866 command, which has been available since 1.16.
6867 - [Ending a float literal with `._` is now a hard error.
6868 Example: `42._` .][41946]
6869 - [Any use of a private `extern crate` outside of its module is now a
6870 hard error.][36886] This was previously a warning.
6871 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6872 relative while the `::` prefix makes a path absolute, but was ignored and the
6873 path was relative regardless.
6874 - [Floating point constants in match patterns is now a hard error][36890]
6875 This was previously a warning.
6876 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6877 match patterns is now a hard error][36891] This was previously a warning.
6878 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6880 - [From the pound escape, lines consisting of multiple `#`s are
6882 - [It is an error to re-export private enum variants][42460]. This is
6883 known to break a number of crates that depend on an older version of
6885 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6886 to use it to find the linker, and the build will fail where it did
6887 not previously][42607]
6889 [36886]: https://github.com/rust-lang/rust/issues/36886
6890 [36888]: https://github.com/rust-lang/rust/issues/36888
6891 [36890]: https://github.com/rust-lang/rust/issues/36890
6892 [36891]: https://github.com/rust-lang/rust/issues/36891
6893 [36892]: https://github.com/rust-lang/rust/issues/36892
6894 [37406]: https://github.com/rust-lang/rust/issues/37406
6895 [39983]: https://github.com/rust-lang/rust/pull/39983
6896 [41145]: https://github.com/rust-lang/rust/pull/41145
6897 [41192]: https://github.com/rust-lang/rust/pull/41192
6898 [41258]: https://github.com/rust-lang/rust/pull/41258
6899 [41370]: https://github.com/rust-lang/rust/pull/41370
6900 [41449]: https://github.com/rust-lang/rust/pull/41449
6901 [41530]: https://github.com/rust-lang/rust/pull/41530
6902 [41624]: https://github.com/rust-lang/rust/pull/41624
6903 [41656]: https://github.com/rust-lang/rust/pull/41656
6904 [41659]: https://github.com/rust-lang/rust/pull/41659
6905 [41676]: https://github.com/rust-lang/rust/pull/41676
6906 [41751]: https://github.com/rust-lang/rust/pull/41751
6907 [41764]: https://github.com/rust-lang/rust/pull/41764
6908 [41785]: https://github.com/rust-lang/rust/pull/41785
6909 [41873]: https://github.com/rust-lang/rust/pull/41873
6910 [41907]: https://github.com/rust-lang/rust/pull/41907
6911 [41946]: https://github.com/rust-lang/rust/pull/41946
6912 [42016]: https://github.com/rust-lang/rust/pull/42016
6913 [42037]: https://github.com/rust-lang/rust/pull/42037
6914 [42068]: https://github.com/rust-lang/rust/pull/42068
6915 [42150]: https://github.com/rust-lang/rust/pull/42150
6916 [42162]: https://github.com/rust-lang/rust/pull/42162
6917 [42225]: https://github.com/rust-lang/rust/pull/42225
6918 [42264]: https://github.com/rust-lang/rust/pull/42264
6919 [42302]: https://github.com/rust-lang/rust/pull/42302
6920 [42460]: https://github.com/rust-lang/rust/issues/42460
6921 [42607]: https://github.com/rust-lang/rust/issues/42607
6922 [42740]: https://github.com/rust-lang/rust/pull/42740
6923 [42844]: https://github.com/rust-lang/rust/issues/42844
6924 [42948]: https://github.com/rust-lang/rust/pull/42948
6925 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6926 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6927 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6928 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6929 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6930 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6931 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6932 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6933 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6934 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6935 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6936 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6937 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6938 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6939 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6940 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6941 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6942 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6943 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6944 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6945 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6946 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6949 Version 1.18.0 (2017-06-08)
6950 ===========================
6955 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6956 make the item visible to just that module tree. Also accepts the keyword
6957 `crate` to make something public to the whole crate but not users of the
6958 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6959 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6960 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6961 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6962 types like `Write + Send`, trailing `+` are now supported in trait objects,
6963 and better error reporting for trait objects starting with `?Sized`.
6964 - [0e+10 is now a valid floating point literal][40589]
6965 - [Now warns if you bind a lifetime parameter to 'static][40734]
6966 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6967 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6968 representation in some cases.][40377]
6973 - [rustc can now emit mir with `--emit mir`][39891]
6974 - [Improved LLVM IR for trivial functions][40367]
6975 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6976 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6977 opportunities found through profiling
6978 - [Improved backtrace formatting when panicking][38165]
6983 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6984 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6985 iteration or reallocation.
6986 - [Simplified HashMap Bucket interface][40561] provides performance
6987 improvements for iterating and cloning.
6988 - [Specialize Vec::from_elem to use calloc][40409]
6989 - [Fixed Race condition in fs::create_dir_all][39799]
6990 - [No longer caching stdio on Windows][40516]
6991 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6992 2.50%~ faster and in one case now 12.50% faster.
6993 - [Optimized `AtomicBool::fetch_nand`][41143]
6998 - [`Child::try_wait`]
6999 - [`HashMap::retain`]
7000 - [`HashSet::retain`]
7002 - [`TcpStream::peek`]
7003 - [`UdpSocket::peek`]
7004 - [`UdpSocket::peek_from`]
7009 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
7010 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
7011 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
7012 - [Added Android build support][cargo/3885]
7013 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
7014 of a certain type, for example `cargo build --bins` will build all
7016 - [Added support for haiku][cargo/3952]
7021 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
7022 - [Rust now uses the official cross compiler for NetBSD][40612]
7023 - [rustdoc now accepts `#` at the start of files][40828]
7024 - [Fixed jemalloc support for musl][41168]
7029 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
7030 always placed after the sign if it exists and before the digits. With the `#`
7031 flag the zeroes are placed after the prefix and before the digits.
7032 - [Due to the struct field optimisation][40377], using `transmute` on structs
7033 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
7034 always been undefined behavior, but is now more likely to break in practice.
7035 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
7036 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
7037 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
7038 - [Overlapping inherent `impl`s are now a hard error][40728]
7039 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
7040 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
7041 `out.asm` and `out.ll` instead of only one of the filetypes.
7042 - [ calling a function that returns `Self` will no longer work][41805] when
7043 the size of `Self` cannot be statically determined.
7044 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
7045 this has caused a few regressions namely:
7047 - Changed the link order of local static/dynamic libraries (respecting the
7048 order on given rather than having the compiler reorder).
7049 - Changed how MinGW is linked, native code linked to dynamic libraries
7050 may require manually linking to the gcc support library (for the native
7053 [38165]: https://github.com/rust-lang/rust/pull/38165
7054 [39799]: https://github.com/rust-lang/rust/pull/39799
7055 [39891]: https://github.com/rust-lang/rust/pull/39891
7056 [40043]: https://github.com/rust-lang/rust/pull/40043
7057 [40241]: https://github.com/rust-lang/rust/pull/40241
7058 [40338]: https://github.com/rust-lang/rust/pull/40338
7059 [40367]: https://github.com/rust-lang/rust/pull/40367
7060 [40377]: https://github.com/rust-lang/rust/pull/40377
7061 [40409]: https://github.com/rust-lang/rust/pull/40409
7062 [40516]: https://github.com/rust-lang/rust/pull/40516
7063 [40556]: https://github.com/rust-lang/rust/pull/40556
7064 [40561]: https://github.com/rust-lang/rust/pull/40561
7065 [40589]: https://github.com/rust-lang/rust/pull/40589
7066 [40612]: https://github.com/rust-lang/rust/pull/40612
7067 [40723]: https://github.com/rust-lang/rust/pull/40723
7068 [40728]: https://github.com/rust-lang/rust/pull/40728
7069 [40731]: https://github.com/rust-lang/rust/pull/40731
7070 [40734]: https://github.com/rust-lang/rust/pull/40734
7071 [40805]: https://github.com/rust-lang/rust/pull/40805
7072 [40807]: https://github.com/rust-lang/rust/pull/40807
7073 [40828]: https://github.com/rust-lang/rust/pull/40828
7074 [40870]: https://github.com/rust-lang/rust/pull/40870
7075 [41085]: https://github.com/rust-lang/rust/pull/41085
7076 [41143]: https://github.com/rust-lang/rust/pull/41143
7077 [41168]: https://github.com/rust-lang/rust/pull/41168
7078 [41270]: https://github.com/rust-lang/rust/issues/41270
7079 [41469]: https://github.com/rust-lang/rust/pull/41469
7080 [41805]: https://github.com/rust-lang/rust/issues/41805
7081 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
7082 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
7083 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
7084 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
7085 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
7086 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
7087 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
7088 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
7089 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
7090 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
7091 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
7092 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
7093 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
7094 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
7097 Version 1.17.0 (2017-04-27)
7098 ===========================
7103 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
7104 * [Fields of structs may be initialized without duplicating the field/variable
7105 names][39761]. [RFC 1682]
7106 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
7107 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7108 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
7109 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
7110 `'b`. Soundness fix.
7111 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
7112 * [Static variables may contain references to other statics][40027]
7117 * [Exit quickly on only `--emit dep-info`][40336]
7118 * [Make `-C relocation-model` more correctly determine whether the linker
7119 creates a position-independent executable][40245]
7120 * [Add `-C overflow-checks` to directly control whether integer overflow
7122 * [The rustc type checker now checks items on demand instead of in a single
7123 in-order pass][40008]. This is mostly an internal refactoring in support of
7124 future work, including incremental type checking, but also resolves [RFC
7125 1647], allowing `Self` to appear in `impl` `where` clauses.
7126 * [Optimize vtable loads][39995]
7127 * [Turn off vectorization for Emscripten targets][39990]
7128 * [Provide suggestions for unknown macros imported with `use`][39953]
7129 * [Fix ICEs in path resolution][39939]
7130 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
7131 * [Add clearer error message using `&str + &str`][39116]
7142 * [`Ordering::then`]
7143 * [`Ordering::then_with`]
7144 * [`BTreeMap::range`]
7145 * [`BTreeMap::range_mut`]
7146 * [`collections::Bound`]
7147 * [`process::abort`]
7148 * [`ptr::read_unaligned`]
7149 * [`ptr::write_unaligned`]
7150 * [`Result::expect_err`]
7153 * [`Cell::into_inner`]
7159 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
7160 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
7161 * [`String` implements `FromIterator<&char>`][40028]
7162 * `Box` [implements][40009] a number of new conversions:
7163 `From<Box<str>> for String`,
7164 `From<Box<[T]>> for Vec<T>`,
7165 `From<Box<CStr>> for CString`,
7166 `From<Box<OsStr>> for OsString`,
7167 `From<Box<Path>> for PathBuf`,
7168 `Into<Box<str>> for String`,
7169 `Into<Box<[T]>> for Vec<T>`,
7170 `Into<Box<CStr>> for CString`,
7171 `Into<Box<OsStr>> for OsString`,
7172 `Into<Box<Path>> for PathBuf`,
7173 `Default for Box<str>`,
7174 `Default for Box<CStr>`,
7175 `Default for Box<OsStr>`,
7176 `From<&CStr> for Box<CStr>`,
7177 `From<&OsStr> for Box<OsStr>`,
7178 `From<&Path> for Box<Path>`
7179 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
7180 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
7181 * [Slightly optimize `slice::sort`][39538]
7182 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
7183 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
7184 `Box<str>` implements `From<&str>`][39438]
7185 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
7186 `From<(I, u16)> where I: Into<IpAddr>`][39372]
7187 * [`format!` estimates the needed capacity before writing a string][39356]
7188 * [Support unprivileged symlink creation in Windows][38921]
7189 * [`PathBuf` implements `Default`][38764]
7190 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
7191 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
7192 and poor hash functions.
7197 * [Add `cargo check --all`][cargo/3731]
7198 * [Add an option to ignore SSL revocation checking][cargo/3699]
7199 * [Add `cargo run --package`][cargo/3691]
7200 * [Add `required_features`][cargo/3667]
7201 * [Assume `build.rs` is a build script][cargo/3664]
7202 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
7207 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
7209 * [The "Unstable Book" documents nightly-only features][ubook]
7210 * [Improve the style of the sidebar in rustdoc output][40265]
7211 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
7212 * [Fix MSP430 breakage due to `i128`][40257]
7213 * [Preliminary Solaris/SPARCv9 support][39903]
7214 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
7215 run without installing the MSVC runtime.
7216 * [`rustdoc --test` includes file names in test names][39788]
7217 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
7218 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
7219 * [Initial support for `aarch64-unknown-freebsd`][39491]
7220 * [Initial support for `i686-unknown-netbsd`][39426]
7221 * [This release no longer includes the old makefile build system][39431]. Rust
7222 is built with a custom build system, written in Rust, and with Cargo.
7223 * [Add Debug implementations for libcollection structs][39002]
7224 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
7225 * [`--test-threads=0` produces an error][38945]
7226 * [`rustup` installs documentation by default][40526]
7227 * [The Rust source includes NatVis visualizations][39843]. These can be used by
7228 WinDbg and Visual Studio to improve the debugging experience.
7233 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
7234 workaround, either use MSVC 2015 or run vcvars.bat.
7235 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7236 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
7237 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
7239 * [`format!` and `Display::to_string` panic if an underlying formatting
7240 implementation returns an error][40117]. Previously the error was silently
7241 ignored. It is incorrect for `write_fmt` to return an error when writing
7243 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
7244 crates were marked stable and could be accessed from the stable toolchain.
7245 * [Rust git source no longer includes vendored crates][39728]. Those that need
7246 to build with vendored crates should build from release tarballs.
7247 * [Fix inert attributes from `proc_macro_derives`][39572]
7248 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
7249 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
7251 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
7252 existing code generally ignores the type of dead-code unless a type-hint is
7253 provided; this can cause surprising inference interactions particularly around
7254 defaulting. The new code uniformly ignores the result type of dead-code.
7255 * [Tuple-struct constructors with private fields are no longer visible][38932]
7256 * [Lifetime parameters that do not appear in the arguments are now considered
7257 early-bound][38897], resolving a soundness bug (#[32330]). The
7258 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
7260 * [rustdoc: fix doctests with non-feature crate attributes][38161]
7261 * [Make transmuting from fn item types to pointer-sized types a hard
7264 [27787]: https://github.com/rust-lang/rust/issues/27787
7265 [32330]: https://github.com/rust-lang/rust/issues/32330
7266 [34198]: https://github.com/rust-lang/rust/pull/34198
7267 [38161]: https://github.com/rust-lang/rust/pull/38161
7268 [38368]: https://github.com/rust-lang/rust/pull/38368
7269 [38584]: https://github.com/rust-lang/rust/issues/38584
7270 [38661]: https://github.com/rust-lang/rust/pull/38661
7271 [38764]: https://github.com/rust-lang/rust/pull/38764
7272 [38864]: https://github.com/rust-lang/rust/issues/38864
7273 [38897]: https://github.com/rust-lang/rust/pull/38897
7274 [38921]: https://github.com/rust-lang/rust/pull/38921
7275 [38932]: https://github.com/rust-lang/rust/pull/38932
7276 [38945]: https://github.com/rust-lang/rust/pull/38945
7277 [38981]: https://github.com/rust-lang/rust/pull/38981
7278 [39002]: https://github.com/rust-lang/rust/pull/39002
7279 [39116]: https://github.com/rust-lang/rust/pull/39116
7280 [39193]: https://github.com/rust-lang/rust/pull/39193
7281 [39265]: https://github.com/rust-lang/rust/pull/39265
7282 [39356]: https://github.com/rust-lang/rust/pull/39356
7283 [39372]: https://github.com/rust-lang/rust/pull/39372
7284 [39426]: https://github.com/rust-lang/rust/pull/39426
7285 [39431]: https://github.com/rust-lang/rust/pull/39431
7286 [39438]: https://github.com/rust-lang/rust/pull/39438
7287 [39440]: https://github.com/rust-lang/rust/pull/39440
7288 [39485]: https://github.com/rust-lang/rust/pull/39485
7289 [39491]: https://github.com/rust-lang/rust/pull/39491
7290 [39518]: https://github.com/rust-lang/rust/pull/39518
7291 [39538]: https://github.com/rust-lang/rust/pull/39538
7292 [39572]: https://github.com/rust-lang/rust/pull/39572
7293 [39633]: https://github.com/rust-lang/rust/pull/39633
7294 [39642]: https://github.com/rust-lang/rust/pull/39642
7295 [39728]: https://github.com/rust-lang/rust/pull/39728
7296 [39761]: https://github.com/rust-lang/rust/pull/39761
7297 [39788]: https://github.com/rust-lang/rust/pull/39788
7298 [39793]: https://github.com/rust-lang/rust/pull/39793
7299 [39837]: https://github.com/rust-lang/rust/pull/39837
7300 [39843]: https://github.com/rust-lang/rust/pull/39843
7301 [39851]: https://github.com/rust-lang/rust/pull/39851
7302 [39903]: https://github.com/rust-lang/rust/pull/39903
7303 [39939]: https://github.com/rust-lang/rust/pull/39939
7304 [39953]: https://github.com/rust-lang/rust/pull/39953
7305 [39960]: https://github.com/rust-lang/rust/pull/39960
7306 [39990]: https://github.com/rust-lang/rust/pull/39990
7307 [39995]: https://github.com/rust-lang/rust/pull/39995
7308 [40008]: https://github.com/rust-lang/rust/pull/40008
7309 [40009]: https://github.com/rust-lang/rust/pull/40009
7310 [40027]: https://github.com/rust-lang/rust/pull/40027
7311 [40028]: https://github.com/rust-lang/rust/pull/40028
7312 [40037]: https://github.com/rust-lang/rust/pull/40037
7313 [40117]: https://github.com/rust-lang/rust/pull/40117
7314 [40166]: https://github.com/rust-lang/rust/pull/40166
7315 [40245]: https://github.com/rust-lang/rust/pull/40245
7316 [40257]: https://github.com/rust-lang/rust/pull/40257
7317 [40261]: https://github.com/rust-lang/rust/pull/40261
7318 [40265]: https://github.com/rust-lang/rust/pull/40265
7319 [40319]: https://github.com/rust-lang/rust/pull/40319
7320 [40336]: https://github.com/rust-lang/rust/pull/40336
7321 [40526]: https://github.com/rust-lang/rust/pull/40526
7322 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7323 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7324 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7325 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7326 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7327 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7328 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7329 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7330 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7331 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7332 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7333 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7334 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7335 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7336 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7337 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7338 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7339 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7340 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7341 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7342 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7343 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7344 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7345 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7346 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7347 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7348 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7349 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7350 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7351 [ubook]: https://doc.rust-lang.org/unstable-book/
7354 Version 1.16.0 (2017-03-16)
7355 ===========================
7360 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7361 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7362 match patterns][38069]
7363 * [Clean up semantics of `self` in an import list][38313]
7364 * [`Self` may appear in `impl` headers][38920]
7365 * [`Self` may appear in struct expressions][39282]
7370 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7371 a `.rmeta` file containing only crate metadata][38571]. This can be
7372 used by tools like the Rust Language Service to perform
7373 metadata-only builds.
7374 * [Levenshtein based typo suggestions now work in most places, while
7375 previously they worked only for fields and sometimes for local
7376 variables][38927]. Together with the overhaul of "no
7377 resolution"/"unexpected resolution" errors (#[38154]) they result in
7378 large and systematic improvement in resolution diagnostics.
7379 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7381 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7382 * [`rustc` no longer attempts to provide "consider using an explicit
7383 lifetime" suggestions][37057]. They were inaccurate.
7388 * [`VecDeque::truncate`]
7389 * [`VecDeque::resize`]
7390 * [`String::insert_str`]
7391 * [`Duration::checked_add`]
7392 * [`Duration::checked_sub`]
7393 * [`Duration::checked_div`]
7394 * [`Duration::checked_mul`]
7397 * [`SocketAddr::is_ipv4`]
7398 * [`SocketAddr::is_ipv6`]
7399 * [`IpAddr::is_ipv4`]
7400 * [`IpAddr::is_ipv6`]
7402 * [`Vec::dedup_by_key`]
7403 * [`Result::unwrap_or_default`]
7404 * [`<*const T>::wrapping_offset`]
7405 * [`<*mut T>::wrapping_offset`]
7406 * `CommandExt::creation_flags`
7407 * [`File::set_permissions`]
7408 * [`String::split_off`]
7413 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7414 their argument by `Borrow` parameter][37761]
7415 * [All public types in std implement `Debug`][38006]
7416 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7417 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7418 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7420 * [std: Fix partial writes in `LineWriter`][38062]
7421 * [std: Clamp max read/write sizes on Unix][38622]
7422 * [Use more specific panic message for `&str` slicing errors][38066]
7423 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7424 functionality cannot be achieved in std currently.
7425 * [`writeln!`, like `println!`, now accepts a form with no string
7426 or formatting arguments, to just print a newline][38469]
7427 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7428 * [Reduce the size of static data in `std_unicode::tables`][38781]
7429 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7430 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7432 * [`Duration` implements `Sum`][38712]
7433 * [`String` implements `ToSocketAddrs`][39048]
7438 * [The `cargo check` command does a type check of a project without
7439 building it][cargo/3296]
7440 * [crates.io will display CI badges from Travis and AppVeyor, if
7441 specified in Cargo.toml][cargo/3546]
7442 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7443 * [Compilation profiles accept integer values for `debug`, in addition
7444 to `true` and `false`. These are passed to `rustc` as the value to
7445 `-C debuginfo`][cargo/3534]
7446 * [Implement `cargo --version --verbose`][cargo/3604]
7447 * [All builds now output 'dep-info' build dependencies compatible with
7448 make and ninja][cargo/3557]
7449 * [Build all workspace members with `build --all`][cargo/3511]
7450 * [Document all workspace members with `doc --all`][cargo/3515]
7451 * [Path deps outside workspace are not members][cargo/3443]
7456 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7457 the path to the Rust implementation][38589]
7458 * [The `armv7-linux-androideabi` target no longer enables NEON
7459 extensions, per Google's ABI guide][38413]
7460 * [The stock standard library can be compiled for Redox OS][38401]
7461 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7463 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7465 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7470 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7471 match patterns][38069]
7472 * In this release, references to uninhabited types can not be
7473 pattern-matched. This was accidentally allowed in 1.15.
7474 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7475 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7477 * [Clean up semantics of `self` in an import list][38313]
7478 * Reimplemented lifetime elision. This change was almost entirely compatible
7479 with existing code, but it did close a number of small bugs and loopholes,
7480 as well as being more accepting in some other [cases][41105].
7482 [37057]: https://github.com/rust-lang/rust/pull/37057
7483 [37761]: https://github.com/rust-lang/rust/pull/37761
7484 [38006]: https://github.com/rust-lang/rust/pull/38006
7485 [38051]: https://github.com/rust-lang/rust/pull/38051
7486 [38062]: https://github.com/rust-lang/rust/pull/38062
7487 [38622]: https://github.com/rust-lang/rust/pull/38622
7488 [38066]: https://github.com/rust-lang/rust/pull/38066
7489 [38069]: https://github.com/rust-lang/rust/pull/38069
7490 [38131]: https://github.com/rust-lang/rust/pull/38131
7491 [38154]: https://github.com/rust-lang/rust/pull/38154
7492 [38274]: https://github.com/rust-lang/rust/pull/38274
7493 [38304]: https://github.com/rust-lang/rust/pull/38304
7494 [38313]: https://github.com/rust-lang/rust/pull/38313
7495 [38327]: https://github.com/rust-lang/rust/pull/38327
7496 [38401]: https://github.com/rust-lang/rust/pull/38401
7497 [38413]: https://github.com/rust-lang/rust/pull/38413
7498 [38469]: https://github.com/rust-lang/rust/pull/38469
7499 [38559]: https://github.com/rust-lang/rust/pull/38559
7500 [38571]: https://github.com/rust-lang/rust/pull/38571
7501 [38580]: https://github.com/rust-lang/rust/pull/38580
7502 [38589]: https://github.com/rust-lang/rust/pull/38589
7503 [38670]: https://github.com/rust-lang/rust/pull/38670
7504 [38712]: https://github.com/rust-lang/rust/pull/38712
7505 [38726]: https://github.com/rust-lang/rust/pull/38726
7506 [38781]: https://github.com/rust-lang/rust/pull/38781
7507 [38798]: https://github.com/rust-lang/rust/pull/38798
7508 [38909]: https://github.com/rust-lang/rust/pull/38909
7509 [38920]: https://github.com/rust-lang/rust/pull/38920
7510 [38927]: https://github.com/rust-lang/rust/pull/38927
7511 [39048]: https://github.com/rust-lang/rust/pull/39048
7512 [39282]: https://github.com/rust-lang/rust/pull/39282
7513 [39379]: https://github.com/rust-lang/rust/pull/39379
7514 [41105]: https://github.com/rust-lang/rust/issues/41105
7515 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7516 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7517 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7518 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7519 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7520 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7521 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7522 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7523 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7524 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7525 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7526 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7527 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7528 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7529 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7530 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7531 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7532 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7533 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7534 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7535 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7536 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7537 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7538 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7539 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7540 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7541 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7542 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7543 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7546 Version 1.15.1 (2017-02-09)
7547 ===========================
7549 * [Fix IntoIter::as_mut_slice's signature][39466]
7550 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7552 [39466]: https://github.com/rust-lang/rust/pull/39466
7553 [39523]: https://github.com/rust-lang/rust/pull/39523
7556 Version 1.15.0 (2017-02-02)
7557 ===========================
7562 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7563 stable. This allows popular code-generating crates like Serde and Diesel to
7564 work ergonomically. [RFC 1681].
7565 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7566 with curly braces][36868]. Part of [RFC 1506].
7567 * [A number of minor changes to name resolution have been activated][37127].
7568 They add up to more consistent semantics, allowing for future evolution of
7569 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7570 details of what is different. The breaking changes here have been transitioned
7571 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7572 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7574 * [`?Sized` can be used in `where` clauses][37791]
7575 * [There is now a limit on the size of monomorphized types and it can be
7576 modified with the `#![type_size_limit]` crate attribute, similarly to
7577 the `#![recursion_limit]` attribute][37789]
7582 * [On Windows, the compiler will apply dllimport attributes when linking to
7583 extern functions][37973]. Additional attributes and flags can control which
7584 library kind is linked and its name. [RFC 1717].
7585 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7586 * [The `--test` flag works with procedural macro crates][38107]
7587 * [Fix `extern "aapcs" fn` ABI][37814]
7588 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7589 * [The `format!` expander recognizes incorrect `printf` and shell-style
7590 formatting directives and suggests the correct format][37613].
7591 * [Only report one error for all unused imports in an import list][37456]
7593 Compiler Performance
7594 --------------------
7596 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7597 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7598 * [Don't clone in `UnificationTable::probe`][37848]
7599 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7600 * [Use small vectors in type walker][37760]
7601 * [Macro expansion performance was improved][37701]
7602 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7603 * [Replace FNV with a faster hash function][37229]
7608 * [`std::iter::Iterator::min_by`]
7609 * [`std::iter::Iterator::max_by`]
7610 * [`std::os::*::fs::FileExt`]
7611 * [`std::sync::atomic::Atomic*::get_mut`]
7612 * [`std::sync::atomic::Atomic*::into_inner`]
7613 * [`std::vec::IntoIter::as_slice`]
7614 * [`std::vec::IntoIter::as_mut_slice`]
7615 * [`std::sync::mpsc::Receiver::try_iter`]
7616 * [`std::os::unix::process::CommandExt::before_exec`]
7617 * [`std::rc::Rc::strong_count`]
7618 * [`std::rc::Rc::weak_count`]
7619 * [`std::sync::Arc::strong_count`]
7620 * [`std::sync::Arc::weak_count`]
7621 * [`std::char::encode_utf8`]
7622 * [`std::char::encode_utf16`]
7623 * [`std::cell::Ref::clone`]
7624 * [`std::io::Take::into_inner`]
7629 * [The standard sorting algorithm has been rewritten for dramatic performance
7630 improvements][38192]. It is a hybrid merge sort, drawing influences from
7631 Timsort. Previously it was a naive merge sort.
7632 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7633 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7635 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7636 and `char_indices().last()`][37882]
7637 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7638 * [Chinese characters display correctly in `fmt::Debug`][37855]
7639 * [Derive `Default` for `Duration`][37699]
7640 * [Support creation of anonymous pipes on WinXP/2k][37677]
7641 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7642 * [Don't pass overlapped handles to processes][38835]
7647 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7648 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7649 should instead check the variable at runtime with `std::env`. That the value
7650 was set at build time was a bug, and incorrect when cross-compiling. This
7651 change is known to cause breakage.
7652 * [Add `--all` flag to `cargo test`][cargo/3221]
7653 * [Compile statically against the MSVC CRT][cargo/3363]
7654 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7655 * [Link OpenSSL statically on OSX][cargo/3311]
7656 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7657 * [Test for bad path overrides with summaries][cargo/3336]
7658 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7659 * [Fix retrying crate downloads for network errors][cargo/3348]
7660 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7661 * [Emit more info on --message-format=json][cargo/3319]
7662 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7663 * [Don't ignore errors in workspace manifest][cargo/3409]
7664 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7669 * [Test runners (binaries built with `--test`) now support a `--list` argument
7670 that lists the tests it contains][38185]
7671 * [Test runners now support a `--exact` argument that makes the test filter
7672 match exactly, instead of matching only a substring of the test name][38181]
7673 * [rustdoc supports a `--playground-url` flag][37763]
7674 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7679 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7680 continue to be used in this release by passing `--disable-rustbuild` to the
7681 configure script, but they will be deleted soon. Note that the new build
7682 system uses a different on-disk layout that will likely affect any scripts
7684 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7686 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7687 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7693 * [A number of minor changes to name resolution have been activated][37127].
7694 They add up to more consistent semantics, allowing for future evolution of
7695 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7696 details of what is different. The breaking changes here have been transitioned
7697 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7698 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7699 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7700 should instead check the variable at runtime with `std::env`. That the value
7701 was set at build time was a bug, and incorrect when cross-compiling. This
7702 change is known to cause breakage.
7703 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7704 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7705 1.10 and is now an error by default. It will become a hard error in the near
7707 * [The semantics relating modules to file system directories are changing in
7708 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7709 lint, which is a warning in this release, and will become a hard error in the
7711 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7712 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7713 the underlying iterator][37834]
7715 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7716 [33685]: https://github.com/rust-lang/rust/issues/33685
7717 [36868]: https://github.com/rust-lang/rust/pull/36868
7718 [37127]: https://github.com/rust-lang/rust/pull/37127
7719 [37229]: https://github.com/rust-lang/rust/pull/37229
7720 [37456]: https://github.com/rust-lang/rust/pull/37456
7721 [37527]: https://github.com/rust-lang/rust/pull/37527
7722 [37602]: https://github.com/rust-lang/rust/pull/37602
7723 [37613]: https://github.com/rust-lang/rust/pull/37613
7724 [37615]: https://github.com/rust-lang/rust/pull/37615
7725 [37636]: https://github.com/rust-lang/rust/pull/37636
7726 [37627]: https://github.com/rust-lang/rust/pull/37627
7727 [37642]: https://github.com/rust-lang/rust/pull/37642
7728 [37677]: https://github.com/rust-lang/rust/pull/37677
7729 [37699]: https://github.com/rust-lang/rust/pull/37699
7730 [37701]: https://github.com/rust-lang/rust/pull/37701
7731 [37705]: https://github.com/rust-lang/rust/pull/37705
7732 [37749]: https://github.com/rust-lang/rust/pull/37749
7733 [37760]: https://github.com/rust-lang/rust/pull/37760
7734 [37763]: https://github.com/rust-lang/rust/pull/37763
7735 [37764]: https://github.com/rust-lang/rust/pull/37764
7736 [37789]: https://github.com/rust-lang/rust/pull/37789
7737 [37791]: https://github.com/rust-lang/rust/pull/37791
7738 [37814]: https://github.com/rust-lang/rust/pull/37814
7739 [37817]: https://github.com/rust-lang/rust/pull/37817
7740 [37834]: https://github.com/rust-lang/rust/pull/37834
7741 [37848]: https://github.com/rust-lang/rust/pull/37848
7742 [37855]: https://github.com/rust-lang/rust/pull/37855
7743 [37882]: https://github.com/rust-lang/rust/pull/37882
7744 [37888]: https://github.com/rust-lang/rust/pull/37888
7745 [37973]: https://github.com/rust-lang/rust/pull/37973
7746 [37979]: https://github.com/rust-lang/rust/pull/37979
7747 [38086]: https://github.com/rust-lang/rust/pull/38086
7748 [38107]: https://github.com/rust-lang/rust/pull/38107
7749 [38117]: https://github.com/rust-lang/rust/pull/38117
7750 [38134]: https://github.com/rust-lang/rust/pull/38134
7751 [38146]: https://github.com/rust-lang/rust/pull/38146
7752 [38181]: https://github.com/rust-lang/rust/pull/38181
7753 [38182]: https://github.com/rust-lang/rust/pull/38182
7754 [38185]: https://github.com/rust-lang/rust/pull/38185
7755 [38192]: https://github.com/rust-lang/rust/pull/38192
7756 [38279]: https://github.com/rust-lang/rust/pull/38279
7757 [38835]: https://github.com/rust-lang/rust/pull/38835
7758 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7759 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7760 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7761 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7762 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7763 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7764 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7765 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7766 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7767 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7768 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7769 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7770 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7771 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7772 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7773 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7774 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7775 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7776 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7777 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7778 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7779 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7780 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7781 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7782 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7783 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7784 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7785 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7786 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7787 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7788 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7789 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7790 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7791 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7792 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7793 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7794 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7797 Version 1.14.0 (2016-12-22)
7798 ===========================
7803 * [`..` matches multiple tuple fields in enum variants, structs
7804 and tuples][36843]. [RFC 1492].
7805 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7806 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7807 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7808 dereferencing][36822]
7813 * [Mark enums with non-zero discriminant as non-zero][37224]
7814 * [Lower-case `static mut` names are linted like other
7815 statics and consts][37162]
7816 * [Fix ICE on some macros in const integer positions
7817 (e.g. `[u8; m!()]`)][36819]
7818 * [Improve error message and snippet for "did you mean `x`"][36798]
7819 * [Add a panic-strategy field to the target specification][36794]
7820 * [Include LLVM version in `--version --verbose`][37200]
7822 Compile-time Optimizations
7823 --------------------------
7825 * [Improve macro expansion performance][37569]
7826 * [Shrink `Expr_::ExprInlineAsm`][37445]
7827 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7828 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7829 * [Avoid more allocations when compiling html5ever][37373]
7830 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7831 * [Avoid some allocations in the macro parser][37318]
7832 * [Use a faster deflate setting][37298]
7833 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7834 during interning of slices][37270]
7835 * [Optimize `write_metadata`][37267]
7836 * [Don't process obligation forest cycles when stalled][37231]
7837 * [Avoid many `CrateConfig` clones][37161]
7838 * [Optimize `Substs::super_fold_with`][37108]
7839 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7840 * [Speed up `plug_leaks`][36917]
7845 * [`println!()`, with no arguments, prints newline][36825].
7846 Previously, an empty string was required to achieve the same.
7847 * [`Wrapping` impls standard binary and unary operators, as well as
7848 the `Sum` and `Product` iterators][37356]
7849 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7851 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7852 `VecDeque` iterators][37315]
7853 * [Improve `SipHasher` performance on small values][37312]
7854 * [Add Iterator trait TrustedLen to enable better FromIterator /
7856 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7857 * [`ReadDir` implements `Debug`][37221]
7858 * [Implement `RefUnwindSafe` for atomic types][37178]
7859 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7860 * [Avoid allocations in `Decoder::read_str`][37064]
7861 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7862 * [Impl `Debug` for raw pointers to unsized data][36880]
7863 * [Don't reuse `HashMap` random seeds][37470]
7864 * [The internal memory layout of `HashMap` is more cache-friendly, for
7865 significant improvements in some operations][36692]
7866 * [`HashMap` uses less memory on 32-bit architectures][36595]
7867 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7872 * [Expose rustc cfg values to build scripts][cargo/3243]
7873 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7874 * [Fix passing --features when testing multiple packages][cargo/3280]
7875 * [Use a single profile set per workspace][cargo/3249]
7876 * [Load `replace` sections from lock files][cargo/3220]
7877 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7882 * [rustup is the recommended Rust installation method][1.14rustup]
7883 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7884 S390x. These are [tier 2] platforms and may have major defects. Follow the
7885 instructions on the website to install, or add the targets to an existing
7886 installation with `rustup target add`. The new target triples are:
7887 - `mips-unknown-linux-gnu`
7888 - `mipsel-unknown-linux-gnu`
7889 - `mips64-unknown-linux-gnuabi64`
7890 - `mips64el-unknown-linux-gnuabi64 `
7891 - `powerpc-unknown-linux-gnu`
7892 - `powerpc64-unknown-linux-gnu`
7893 - `powerpc64le-unknown-linux-gnu`
7894 - `s390x-unknown-linux-gnu `
7895 * This release includes target (std) builds for ARM Linux running MUSL
7896 libc. These are [tier 2] platforms and may have major defects. Add the
7897 following triples to an existing rustup installation with `rustup target add`:
7898 - `arm-unknown-linux-musleabi`
7899 - `arm-unknown-linux-musleabihf`
7900 - `armv7-unknown-linux-musleabihf`
7901 * This release includes [experimental support for WebAssembly][1.14wasm], via
7902 the `wasm32-unknown-emscripten` target. This target is known to have major
7903 defects. Please test, report, and fix.
7904 * rustup no longer installs documentation by default. Run `rustup
7905 component add rust-docs` to install.
7906 * [Fix line stepping in debugger][37310]
7907 * [Enable line number debuginfo in releases][37280]
7912 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7913 * [Add support for Fuchsia OS][37313]
7914 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7919 * [A number of forward-compatibility lints used by the compiler
7920 to gradually introduce language changes have been converted
7921 to deny by default][36894]:
7922 - ["use of inaccessible extern crate erroneously allowed"][36886]
7923 - ["type parameter default erroneously allowed in invalid location"][36887]
7924 - ["detects super or self keywords at the beginning of global path"][36888]
7925 - ["two overlapping inherent impls define an item with the same name
7926 were erroneously allowed"][36889]
7927 - ["floating-point constants cannot be used in patterns"][36890]
7928 - ["constants of struct or enum type can only be used in a pattern if
7929 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7930 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7931 * [Prohibit patterns in trait methods without bodies][37378]
7932 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7933 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7934 * [The `$crate` macro variable is accepted in fewer locations][37213]
7935 * [Impls specifying extra region requirements beyond the trait
7936 they implement are rejected][37167]
7937 * [Enums may not be unsized][37111]. Unsized enums are intended to
7938 work but never have. For now they are forbidden.
7939 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7941 [tier 2]: https://forge.rust-lang.org/platform-support.html
7942 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7943 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7944 [36430]: https://github.com/rust-lang/rust/pull/36430
7945 [36595]: https://github.com/rust-lang/rust/pull/36595
7946 [36692]: https://github.com/rust-lang/rust/pull/36692
7947 [36767]: https://github.com/rust-lang/rust/pull/36767
7948 [36794]: https://github.com/rust-lang/rust/pull/36794
7949 [36798]: https://github.com/rust-lang/rust/pull/36798
7950 [36819]: https://github.com/rust-lang/rust/pull/36819
7951 [36822]: https://github.com/rust-lang/rust/pull/36822
7952 [36825]: https://github.com/rust-lang/rust/pull/36825
7953 [36843]: https://github.com/rust-lang/rust/pull/36843
7954 [36880]: https://github.com/rust-lang/rust/pull/36880
7955 [36886]: https://github.com/rust-lang/rust/issues/36886
7956 [36887]: https://github.com/rust-lang/rust/issues/36887
7957 [36888]: https://github.com/rust-lang/rust/issues/36888
7958 [36889]: https://github.com/rust-lang/rust/issues/36889
7959 [36890]: https://github.com/rust-lang/rust/issues/36890
7960 [36891]: https://github.com/rust-lang/rust/issues/36891
7961 [36892]: https://github.com/rust-lang/rust/issues/36892
7962 [36894]: https://github.com/rust-lang/rust/pull/36894
7963 [36917]: https://github.com/rust-lang/rust/pull/36917
7964 [36993]: https://github.com/rust-lang/rust/pull/36993
7965 [37037]: https://github.com/rust-lang/rust/pull/37037
7966 [37064]: https://github.com/rust-lang/rust/pull/37064
7967 [37094]: https://github.com/rust-lang/rust/pull/37094
7968 [37108]: https://github.com/rust-lang/rust/pull/37108
7969 [37111]: https://github.com/rust-lang/rust/pull/37111
7970 [37161]: https://github.com/rust-lang/rust/pull/37161
7971 [37162]: https://github.com/rust-lang/rust/pull/37162
7972 [37167]: https://github.com/rust-lang/rust/pull/37167
7973 [37178]: https://github.com/rust-lang/rust/pull/37178
7974 [37200]: https://github.com/rust-lang/rust/pull/37200
7975 [37213]: https://github.com/rust-lang/rust/pull/37213
7976 [37221]: https://github.com/rust-lang/rust/pull/37221
7977 [37224]: https://github.com/rust-lang/rust/pull/37224
7978 [37230]: https://github.com/rust-lang/rust/pull/37230
7979 [37231]: https://github.com/rust-lang/rust/pull/37231
7980 [37247]: https://github.com/rust-lang/rust/pull/37247
7981 [37267]: https://github.com/rust-lang/rust/pull/37267
7982 [37270]: https://github.com/rust-lang/rust/pull/37270
7983 [37273]: https://github.com/rust-lang/rust/pull/37273
7984 [37280]: https://github.com/rust-lang/rust/pull/37280
7985 [37298]: https://github.com/rust-lang/rust/pull/37298
7986 [37306]: https://github.com/rust-lang/rust/pull/37306
7987 [37310]: https://github.com/rust-lang/rust/pull/37310
7988 [37312]: https://github.com/rust-lang/rust/pull/37312
7989 [37313]: https://github.com/rust-lang/rust/pull/37313
7990 [37315]: https://github.com/rust-lang/rust/pull/37315
7991 [37318]: https://github.com/rust-lang/rust/pull/37318
7992 [37322]: https://github.com/rust-lang/rust/pull/37322
7993 [37326]: https://github.com/rust-lang/rust/pull/37326
7994 [37351]: https://github.com/rust-lang/rust/pull/37351
7995 [37356]: https://github.com/rust-lang/rust/pull/37356
7996 [37367]: https://github.com/rust-lang/rust/pull/37367
7997 [37373]: https://github.com/rust-lang/rust/pull/37373
7998 [37378]: https://github.com/rust-lang/rust/pull/37378
7999 [37389]: https://github.com/rust-lang/rust/pull/37389
8000 [37392]: https://github.com/rust-lang/rust/pull/37392
8001 [37427]: https://github.com/rust-lang/rust/pull/37427
8002 [37439]: https://github.com/rust-lang/rust/pull/37439
8003 [37445]: https://github.com/rust-lang/rust/pull/37445
8004 [37470]: https://github.com/rust-lang/rust/pull/37470
8005 [37569]: https://github.com/rust-lang/rust/pull/37569
8006 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
8007 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
8008 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
8009 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
8010 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
8011 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
8012 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
8015 Version 1.13.0 (2016-11-10)
8016 ===========================
8021 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
8022 errors, like the `try!` macro, described in [RFC 0243].
8023 * [Stabilize macros in type position][36014]. Described in [RFC 873].
8024 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
8025 * [Fix `#[derive]` for empty tuple structs/variants][35728]
8026 * [Fix lifetime rules for 'if' conditions][36029]
8027 * [Avoid loading and parsing unconfigured non-inline modules][36482]
8032 * [Add the `-C link-arg` argument][36574]
8033 * [Remove the old AST-based backend from rustc_trans][35764]
8034 * [Don't enable NEON by default on armv7 Linux][35814]
8035 * [Fix debug line number info for macro expansions][35238]
8036 * [Do not emit "class method" debuginfo for types that are not
8037 DICompositeType][36008]
8038 * [Warn about multiple conflicting #[repr] hints][34623]
8039 * [When sizing DST, don't double-count nested struct prefixes][36351]
8040 * [Default RUST_MIN_STACK to 16MiB for now][36505]
8041 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
8042 * [Reject macros with empty repetitions to avoid infinite loop][36721]
8043 * [Expand macros without recursing to avoid stack overflows][36214]
8048 * [Replace macro backtraces with labeled local uses][35702]
8049 * [Improve error message for misplaced doc comments][33922]
8050 * [Buffer unix and lock windows to prevent message interleaving][35975]
8051 * [Update lifetime errors to specifically note temporaries][36171]
8052 * [Special case a few colors for Windows][36178]
8053 * [Suggest `use self` when such an import resolves][36289]
8054 * [Be more specific when type parameter shadows primitive type][36338]
8055 * Many minor improvements
8057 Compile-time Optimizations
8058 --------------------------
8060 * [Compute and cache HIR hashes at beginning][35854]
8061 * [Don't hash types in loan paths][36004]
8062 * [Cache projections in trans][35761]
8063 * [Optimize the parser's last token handling][36527]
8064 * [Only instantiate #[inline] functions in codegen units referencing
8065 them][36524]. This leads to big improvements in cases where crates export
8066 define many inline functions without using them directly.
8067 * [Lazily allocate TypedArena's first chunk][36592]
8068 * [Don't allocate during default HashSet creation][36734]
8075 * [`overflowing_abs`]
8076 * [`RefCell::try_borrow`]
8077 * [`RefCell::try_borrow_mut`]
8082 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
8083 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
8085 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
8086 * [Implement `Debug` for `std::vec::IntoIter`][35707]
8087 * [`CString`: avoid excessive growth just to 0-terminate][35871]
8088 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
8089 * [Use arc4rand on FreeBSD][35884]
8090 * [memrchr: Correct aligned offset computation][35969]
8091 * [Improve Demangling of Rust Symbols][36059]
8092 * [Use monotonic time in condition variables][35048]
8093 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
8094 * [Implement conversion traits for `char`][35755]
8095 * [Fix illegal instruction caused by overflow in channel cloning][36104]
8096 * [Zero first byte of CString on drop][36264]
8097 * [Inherit overflow checks for sum and product][36372]
8098 * [Add missing Eq implementations][36423]
8099 * [Implement `Debug` for `DirEntry`][36631]
8100 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
8102 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
8103 * [Implement more traits for `std::io::ErrorKind`][35911]
8104 * [Optimize BinaryHeap bounds checking][36072]
8105 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
8106 `extend_with_element`][36355]
8107 * [Fix overflow checking in unsigned pow()][34942]
8112 * This release includes security fixes to both curl and OpenSSL.
8113 * [Fix transitive doctests when panic=abort][cargo/3021]
8114 * [Add --all-features flag to cargo][cargo/3038]
8115 * [Reject path-based dependencies in `cargo package`][cargo/3060]
8116 * [Don't parse the home directory more than once][cargo/3078]
8117 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
8118 * [Update OpenSSL to 1.0.2j][cargo/3121]
8119 * [Add license and license_file to cargo metadata output][cargo/3110]
8120 * [Make crates-io registry URL optional in config; ignore all changes to
8121 source.crates-io][cargo/3089]
8122 * [Don't download dependencies from other platforms][cargo/3123]
8123 * [Build transitive dev-dependencies when needed][cargo/3125]
8124 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
8125 * [Avoid updating registry when adding existing deps][cargo/3144]
8126 * [Warn about path overrides that won't work][cargo/3136]
8127 * [Use workspaces during `cargo install`][cargo/3146]
8128 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
8129 * [Add --message-format flag][cargo/3000]
8130 * [Pass target environment for rustdoc][cargo/3205]
8131 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
8132 * [Update curl and curl-sys][cargo/3241]
8133 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
8138 * [rustdoc: Add the `--sysroot` argument][36586]
8139 * [rustdoc: Fix a couple of issues with the search results][35655]
8140 * [rustdoc: remove the `!` from macro URLs and titles][35234]
8141 * [gdb: Fix pretty-printing special-cased Rust types][35585]
8142 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
8147 * [Remove unmaintained style guide][35124]
8148 * [Add s390x support][36369]
8149 * [Initial work at Haiku OS support][36727]
8150 * [Add mips-uclibc targets][35734]
8151 * [Crate-ify compiler-rt into compiler-builtins][35021]
8152 * [Add rustc version info (git hash + date) to dist tarball][36213]
8153 * Many documentation improvements
8158 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
8159 * [Deny (by default) transmuting from fn item types to pointer-sized
8160 types][34923]. Continuing the long transition to zero-sized fn items,
8162 * [Fix `#[derive]` for empty tuple structs/variants][35728].
8164 * [Issue deprecation warnings for safe accesses to extern statics][36173]
8165 * [Fix lifetime rules for 'if' conditions][36029].
8166 * [Inherit overflow checks for sum and product][36372].
8167 * [Forbid user-defined macros named "macro_rules"][36730].
8169 [33922]: https://github.com/rust-lang/rust/pull/33922
8170 [34623]: https://github.com/rust-lang/rust/pull/34623
8171 [34923]: https://github.com/rust-lang/rust/pull/34923
8172 [34942]: https://github.com/rust-lang/rust/pull/34942
8173 [35021]: https://github.com/rust-lang/rust/pull/35021
8174 [35048]: https://github.com/rust-lang/rust/pull/35048
8175 [35074]: https://github.com/rust-lang/rust/pull/35074
8176 [35124]: https://github.com/rust-lang/rust/pull/35124
8177 [35234]: https://github.com/rust-lang/rust/pull/35234
8178 [35238]: https://github.com/rust-lang/rust/pull/35238
8179 [35354]: https://github.com/rust-lang/rust/pull/35354
8180 [35559]: https://github.com/rust-lang/rust/pull/35559
8181 [35585]: https://github.com/rust-lang/rust/pull/35585
8182 [35627]: https://github.com/rust-lang/rust/pull/35627
8183 [35655]: https://github.com/rust-lang/rust/pull/35655
8184 [35702]: https://github.com/rust-lang/rust/pull/35702
8185 [35707]: https://github.com/rust-lang/rust/pull/35707
8186 [35728]: https://github.com/rust-lang/rust/pull/35728
8187 [35734]: https://github.com/rust-lang/rust/pull/35734
8188 [35755]: https://github.com/rust-lang/rust/pull/35755
8189 [35761]: https://github.com/rust-lang/rust/pull/35761
8190 [35764]: https://github.com/rust-lang/rust/pull/35764
8191 [35814]: https://github.com/rust-lang/rust/pull/35814
8192 [35854]: https://github.com/rust-lang/rust/pull/35854
8193 [35871]: https://github.com/rust-lang/rust/pull/35871
8194 [35884]: https://github.com/rust-lang/rust/pull/35884
8195 [35911]: https://github.com/rust-lang/rust/pull/35911
8196 [35969]: https://github.com/rust-lang/rust/pull/35969
8197 [35975]: https://github.com/rust-lang/rust/pull/35975
8198 [36004]: https://github.com/rust-lang/rust/pull/36004
8199 [36008]: https://github.com/rust-lang/rust/pull/36008
8200 [36014]: https://github.com/rust-lang/rust/pull/36014
8201 [36029]: https://github.com/rust-lang/rust/pull/36029
8202 [36059]: https://github.com/rust-lang/rust/pull/36059
8203 [36072]: https://github.com/rust-lang/rust/pull/36072
8204 [36101]: https://github.com/rust-lang/rust/pull/36101
8205 [36104]: https://github.com/rust-lang/rust/pull/36104
8206 [36171]: https://github.com/rust-lang/rust/pull/36171
8207 [36173]: https://github.com/rust-lang/rust/pull/36173
8208 [36178]: https://github.com/rust-lang/rust/pull/36178
8209 [36213]: https://github.com/rust-lang/rust/pull/36213
8210 [36214]: https://github.com/rust-lang/rust/pull/36214
8211 [36264]: https://github.com/rust-lang/rust/pull/36264
8212 [36266]: https://github.com/rust-lang/rust/pull/36266
8213 [36289]: https://github.com/rust-lang/rust/pull/36289
8214 [36338]: https://github.com/rust-lang/rust/pull/36338
8215 [36351]: https://github.com/rust-lang/rust/pull/36351
8216 [36355]: https://github.com/rust-lang/rust/pull/36355
8217 [36369]: https://github.com/rust-lang/rust/pull/36369
8218 [36372]: https://github.com/rust-lang/rust/pull/36372
8219 [36423]: https://github.com/rust-lang/rust/pull/36423
8220 [36482]: https://github.com/rust-lang/rust/pull/36482
8221 [36505]: https://github.com/rust-lang/rust/pull/36505
8222 [36524]: https://github.com/rust-lang/rust/pull/36524
8223 [36527]: https://github.com/rust-lang/rust/pull/36527
8224 [36551]: https://github.com/rust-lang/rust/pull/36551
8225 [36574]: https://github.com/rust-lang/rust/pull/36574
8226 [36586]: https://github.com/rust-lang/rust/pull/36586
8227 [36592]: https://github.com/rust-lang/rust/pull/36592
8228 [36631]: https://github.com/rust-lang/rust/pull/36631
8229 [36721]: https://github.com/rust-lang/rust/pull/36721
8230 [36727]: https://github.com/rust-lang/rust/pull/36727
8231 [36730]: https://github.com/rust-lang/rust/pull/36730
8232 [36734]: https://github.com/rust-lang/rust/pull/36734
8233 [36754]: https://github.com/rust-lang/rust/pull/36754
8234 [36995]: https://github.com/rust-lang/rust/pull/36995
8235 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
8236 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
8237 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
8238 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
8239 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
8240 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
8241 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
8242 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
8243 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
8244 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
8245 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
8246 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
8247 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
8248 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
8249 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
8250 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
8251 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
8252 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
8253 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
8254 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
8255 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
8256 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
8257 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
8258 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
8259 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
8260 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
8261 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
8262 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
8263 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
8264 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
8265 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
8266 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
8269 Version 1.12.1 (2016-10-20)
8270 ===========================
8275 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
8276 * [Confusion with double negation and booleans][36856]
8277 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
8278 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
8279 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
8280 * [Corrupted memory after updated to 1.12][36936]
8281 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
8282 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
8283 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
8285 [36381]: https://github.com/rust-lang/rust/issues/36381
8286 [36856]: https://github.com/rust-lang/rust/issues/36856
8287 [36875]: https://github.com/rust-lang/rust/issues/36875
8288 [36924]: https://github.com/rust-lang/rust/issues/36924
8289 [36926]: https://github.com/rust-lang/rust/issues/36926
8290 [36936]: https://github.com/rust-lang/rust/issues/36936
8291 [37026]: https://github.com/rust-lang/rust/issues/37026
8292 [37112]: https://github.com/rust-lang/rust/issues/37112
8293 [37153]: https://github.com/rust-lang/rust/issues/37153
8296 Version 1.12.0 (2016-09-29)
8297 ===========================
8302 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8303 This translation pass is far simpler than the previous AST->LLVM pass, and
8304 creates opportunities to perform new optimizations directly on the MIR. It
8305 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8306 * [`rustc` presents a new, more readable error format, along with
8307 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8308 Most common editors supporting Rust have been updated to work with it. It was
8309 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8314 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8315 This translation pass is far simpler than the previous AST->LLVM pass, and
8316 creates opportunities to perform new optimizations directly on the MIR. It
8317 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8318 * [Print the Rust target name, not the LLVM target name, with
8319 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8320 * [The computation of `TypeId` is correct in some cases where it was previously
8321 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8322 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8323 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8324 `--print relocation-models`, and `--print code-models` print the available
8325 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8326 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8327 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8328 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8329 These targets produce statically-linked binaries. There are no binary release
8335 * [`rustc` presents a new, more readable error format, along with
8336 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8337 Most common editors supporting Rust have been updated to work with it. It was
8338 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8339 * [In error descriptions, references are now described in plain English,
8340 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8341 * [In error type descriptions, unknown numeric types are named `{integer}` or
8342 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8343 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8348 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8349 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8350 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8351 useful](https://github.com/rust-lang/rust/pull/34908)
8352 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8353 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8354 * [Semicolons are properly required as statement delimiters inside
8355 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8356 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8361 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8362 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8363 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8364 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8365 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8366 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8367 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8368 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8369 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8370 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8371 Both on Unix and Windows.
8372 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8373 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8374 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8375 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8376 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8377 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8378 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8379 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8384 * [The `format!` macro and friends now allow a single argument to be formatted
8385 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8386 * [The lifetime bounds on `[T]::binary_search_by` and
8387 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8388 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8389 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8390 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8391 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8392 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8393 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8394 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8395 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8396 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8397 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8398 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8399 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8400 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8401 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8402 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8403 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8404 * [`mpsc::sync_channel` `Receiver`s return any available message before
8405 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8406 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8407 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8412 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8413 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8414 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8415 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8416 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8417 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8418 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8419 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8420 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8421 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8422 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8423 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8424 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8425 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8426 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8427 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8432 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8433 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8438 * [Test binaries now support a `--test-threads` argument to specify the number
8439 of threads used to run tests, and which acts the same as the
8440 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8441 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8442 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8443 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8444 * [Rust releases now come with source packages that can be installed by rustup
8445 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8446 The resulting source code can be used by tools and IDES, located in the
8447 sysroot under `lib/rustlib/src`.
8452 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8453 * Many minor improvements to the documentation.
8454 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8459 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8460 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8461 * [When formatting strings, if "precision" is specified, the "fill",
8462 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8463 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8466 Version 1.11.0 (2016-08-18)
8467 ===========================
8472 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8473 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8474 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8475 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8480 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8481 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8482 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8483 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8484 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8485 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8486 (in libcore - previously stabilized in libstd)
8487 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8488 (in libcore - previously stabilized in libstd)
8489 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8490 (in libcore - previously stabilized in libstd)
8491 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8492 (in libcore - previously stabilized in libstd)
8493 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8494 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8495 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8496 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8501 * [The `thread_local!` macro supports multiple definitions in a single
8502 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8503 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8504 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8505 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8506 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8507 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8508 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8509 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8514 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8515 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8516 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8517 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8518 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8519 and `-vv` prints warnings for all crates.
8520 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8521 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8522 This provides room for expansion by arbitrary tools.
8523 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8524 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8525 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8526 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8527 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8528 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8529 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8534 * [Caching projections speeds up type check dramatically for some
8535 workloads](https://github.com/rust-lang/rust/pull/33816)
8536 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8537 This hasher is faster, but is believed to provide sufficient
8538 protection from collision attacks.
8539 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8544 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8545 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8546 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8547 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8548 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8553 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8554 * [When emitting debug info, rustc emits frame pointers for closures,
8555 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8556 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8557 * Many more errors have been given error codes and extended
8559 * API documentation continues to be improved, with many new examples
8564 * [rustc no longer hangs when dependencies recursively re-export
8565 submodules](https://github.com/rust-lang/rust/pull/34542)
8566 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8567 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8568 rewritten](https://github.com/rust-lang/rust/pull/33895)
8569 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8570 No targets use this yet, but it works toward AVR support.
8575 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8576 * [The new follow-set rules that place restrictions on `macro_rules!`
8577 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8578 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8579 and has been a warning since 1.10.
8580 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8581 This causes breakage in some corner cases.
8584 Version 1.10.0 (2016-07-07)
8585 ===========================
8590 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8591 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8592 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8593 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8594 * [`panic!` can be converted to a runtime abort with the
8595 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8596 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8597 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8598 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8599 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8600 Note that Cargo does not yet directly support cdylibs.
8605 * `os::windows::fs::OpenOptionsExt::access_mode`
8606 * `os::windows::fs::OpenOptionsExt::share_mode`
8607 * `os::windows::fs::OpenOptionsExt::custom_flags`
8608 * `os::windows::fs::OpenOptionsExt::attributes`
8609 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8610 * `os::unix::fs::OpenOptionsExt::custom_flags`
8611 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8612 * `Default for sync::Weak`
8613 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8614 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8615 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8616 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8617 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8618 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8619 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8620 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8621 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8622 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8623 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8624 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8625 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8626 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8627 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8628 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8629 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8630 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8631 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8632 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8633 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8634 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8635 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8636 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8637 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8638 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8639 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8640 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8641 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8642 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8643 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8644 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8645 * Read/Write/RawFd impls for `UnixStream`
8646 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8647 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8648 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8649 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8650 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8651 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8652 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8653 * RawFd impls for `UnixListener`
8654 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8655 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8656 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8657 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8658 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8659 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8660 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8661 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8662 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8663 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8664 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8665 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8666 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8667 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8668 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8669 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8670 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8671 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8672 * RawFd impls for `UnixDatagram`
8673 * `{BTree,Hash}Map::values_mut`
8674 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8679 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8680 The semantics of this minor method are subtle and probably not what
8682 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8683 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8684 will fall back to `/dev/urandom` temporarily to avoid blocking
8685 during early boot](https://github.com/rust-lang/rust/pull/33086).
8686 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8687 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8688 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8689 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8690 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8691 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8692 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8696 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8697 This controls the runtime behavior of the `panic!` macro
8698 and can be either "unwind" (the default), or "abort".
8699 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8700 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8701 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8702 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8703 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8704 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8705 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8706 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8707 By default they are retried twice, which can be customized with the
8708 `net.retry` value in `.cargo/config`.
8709 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8710 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8711 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8712 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8713 Makes it possible to install multiple crates in parallel.
8714 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8715 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8716 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8717 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8718 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8719 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8724 * [rustc memory usage was reduced by refactoring the context used for
8725 type checking](https://github.com/rust-lang/rust/pull/33425).
8726 * [Speed up creation of `HashMap`s by caching the random keys used
8727 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8728 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8729 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8730 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8731 10x faster than the previous lookup tables.
8732 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8737 * Many incremental improvements to documentation and rustdoc.
8738 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8739 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8740 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8741 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8742 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8743 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8744 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8749 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8750 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8751 * [`std` no longer prints backtraces on platforms where the running
8752 module must be loaded with `env::current_exe`, which can't be relied
8753 on](https://github.com/rust-lang/rust/pull/33554).
8754 * This release includes std binaries for the i586-unknown-linux-gnu,
8755 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8756 i586 target is for old x86 hardware without SSE2, and the armv7
8757 target is for Android running on modern ARM architectures.
8758 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8759 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8760 * [On Unix the runtime aborts by calling `libc::abort` instead of
8761 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8762 * [Rust is now bootstrapped from the previous release of Rust,
8763 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8768 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8769 * [`target_env` for Linux ARM targets is just `gnu`, not
8770 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8771 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8772 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8773 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8774 Affects how macros are parsed.
8775 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8776 * [Feature-gated attributes on macro-generated macro invocations are
8777 now rejected](https://github.com/rust-lang/rust/pull/32791).
8778 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8779 This caused some minor changes to type inference.
8782 Version 1.9.0 (2016-05-26)
8783 ==========================
8788 * The `#[deprecated]` attribute when applied to an API will generate
8789 warnings when used. The warnings may be suppressed with
8790 `#[allow(deprecated)]`. [RFC 1270].
8791 * [`fn` item types are zero sized, and each `fn` names a unique
8792 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8793 `transmute` on a `fn` type will generate a warning for a few cycles,
8794 then will be converted to an error.
8795 * [Field and method resolution understand visibility, so private
8796 fields and methods cannot prevent the proper use of public fields
8797 and methods][1.9fv].
8798 * [The parser considers unicode codepoints in the
8799 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8805 * [`std::panic::catch_unwind`] (renamed from `recover`)
8806 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8807 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8808 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8809 * [`str::is_char_boundary`]
8810 * [`<*const T>::as_ref`]
8811 * [`<*mut T>::as_ref`]
8812 * [`<*mut T>::as_mut`]
8813 * [`AsciiExt::make_ascii_uppercase`]
8814 * [`AsciiExt::make_ascii_lowercase`]
8815 * [`char::decode_utf16`]
8816 * [`char::DecodeUtf16`]
8817 * [`char::DecodeUtf16Error`]
8818 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8819 * [`BTreeSet::take`]
8820 * [`BTreeSet::replace`]
8823 * [`HashSet::replace`]
8825 * [`OsString::with_capacity`]
8826 * [`OsString::clear`]
8827 * [`OsString::capacity`]
8828 * [`OsString::reserve`]
8829 * [`OsString::reserve_exact`]
8830 * [`OsStr::is_empty`]
8832 * [`std::os::unix::thread`]
8835 * [`JoinHandleExt::as_pthread_t`]
8836 * [`JoinHandleExt::into_pthread_t`]
8837 * [`HashSet::hasher`]
8838 * [`HashMap::hasher`]
8839 * [`CommandExt::exec`]
8840 * [`File::try_clone`]
8841 * [`SocketAddr::set_ip`]
8842 * [`SocketAddr::set_port`]
8843 * [`SocketAddrV4::set_ip`]
8844 * [`SocketAddrV4::set_port`]
8845 * [`SocketAddrV6::set_ip`]
8846 * [`SocketAddrV6::set_port`]
8847 * [`SocketAddrV6::set_flowinfo`]
8848 * [`SocketAddrV6::set_scope_id`]
8849 * [`slice::copy_from_slice`]
8850 * [`ptr::read_volatile`]
8851 * [`ptr::write_volatile`]
8852 * [`OpenOptions::create_new`]
8853 * [`TcpStream::set_nodelay`]
8854 * [`TcpStream::nodelay`]
8855 * [`TcpStream::set_ttl`]
8856 * [`TcpStream::ttl`]
8857 * [`TcpStream::set_only_v6`]
8858 * [`TcpStream::only_v6`]
8859 * [`TcpStream::take_error`]
8860 * [`TcpStream::set_nonblocking`]
8861 * [`TcpListener::set_ttl`]
8862 * [`TcpListener::ttl`]
8863 * [`TcpListener::set_only_v6`]
8864 * [`TcpListener::only_v6`]
8865 * [`TcpListener::take_error`]
8866 * [`TcpListener::set_nonblocking`]
8867 * [`UdpSocket::set_broadcast`]
8868 * [`UdpSocket::broadcast`]
8869 * [`UdpSocket::set_multicast_loop_v4`]
8870 * [`UdpSocket::multicast_loop_v4`]
8871 * [`UdpSocket::set_multicast_ttl_v4`]
8872 * [`UdpSocket::multicast_ttl_v4`]
8873 * [`UdpSocket::set_multicast_loop_v6`]
8874 * [`UdpSocket::multicast_loop_v6`]
8875 * [`UdpSocket::set_multicast_ttl_v6`]
8876 * [`UdpSocket::multicast_ttl_v6`]
8877 * [`UdpSocket::set_ttl`]
8878 * [`UdpSocket::ttl`]
8879 * [`UdpSocket::set_only_v6`]
8880 * [`UdpSocket::only_v6`]
8881 * [`UdpSocket::join_multicast_v4`]
8882 * [`UdpSocket::join_multicast_v6`]
8883 * [`UdpSocket::leave_multicast_v4`]
8884 * [`UdpSocket::leave_multicast_v6`]
8885 * [`UdpSocket::take_error`]
8886 * [`UdpSocket::connect`]
8887 * [`UdpSocket::send`]
8888 * [`UdpSocket::recv`]
8889 * [`UdpSocket::set_nonblocking`]
8894 * [`std::sync::Once` is poisoned if its initialization function
8896 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8897 * [Most types implement `fmt::Debug`][1.9db].
8898 * [The default buffer size used by `BufReader` and `BufWriter` was
8899 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8900 used by other languages.
8901 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8902 `Duration` additionally implements `*=` and `/=`][1.9ta].
8903 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8904 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8905 * [`Chain` implements `BufRead`][1.9ch].
8906 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8911 * [Cargo can now run concurrently][1.9cc].
8912 * [Top-level overrides allow specific revisions of crates to be
8913 overridden through the entire crate graph][1.9ct]. This is intended
8914 to make upgrades easier for large projects, by allowing crates to be
8915 forked temporarily until they've been upgraded and republished.
8916 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8917 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8918 on the commandline][1.9cf]. `rustc` arguments can also be specified
8919 in the `build.rustflags` configuration key.
8924 * [The time complexity of comparing variables for equivalence during type
8925 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8926 to major compilation time improvement in some scenarios.
8927 * [`ToString` is specialized for `str`, giving it the same performance
8928 as `to_owned`][1.9ts].
8929 * [Spawning processes with `Command::output` no longer creates extra
8931 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8932 for C-like enums][1.9cl].
8937 * [Passing the `--quiet` flag to a test runner will produce
8938 much-abbreviated output][1.9q].
8939 * The Rust Project now publishes std binaries for the
8940 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8941 `i586-pc-windows-msvc` targets.
8946 * [`std::sync::Once` is poisoned if its initialization function
8948 * [It is illegal to define methods with the same name in overlapping
8949 inherent `impl` blocks][1.9sn].
8950 * [`fn` item types are zero sized, and each `fn` names a unique
8951 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8952 `transmute` on a `fn` type will generate a warning for a few cycles,
8953 then will be converted to an error.
8954 * [Improvements to const evaluation may trigger new errors when integer
8955 literals are out of range][1.9ce].
8958 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8959 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8960 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8961 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8962 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8963 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8964 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8965 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8966 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8967 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8968 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8969 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8970 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8971 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8972 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8973 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8974 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8975 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8976 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8977 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8978 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8979 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8980 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8981 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8982 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8983 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8984 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8985 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8986 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8987 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8988 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8989 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8990 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8991 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8992 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8993 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8994 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8995 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8996 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8997 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8998 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8999 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
9000 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
9001 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
9002 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
9003 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
9004 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
9005 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
9006 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
9007 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
9008 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
9009 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
9010 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
9011 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
9012 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
9013 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
9014 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
9015 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
9016 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
9017 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
9018 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
9019 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
9020 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
9021 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
9022 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
9023 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
9024 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
9025 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
9026 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
9027 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
9028 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
9029 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
9030 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
9031 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
9032 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
9033 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
9034 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
9035 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
9036 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
9037 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
9038 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
9039 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
9040 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
9041 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
9042 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
9043 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
9044 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
9045 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
9046 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
9047 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
9048 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
9049 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
9050 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
9051 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
9052 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
9053 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
9054 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
9055 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
9056 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
9057 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
9058 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
9059 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
9060 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
9061 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
9062 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
9063 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
9064 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
9065 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
9066 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
9067 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
9070 Version 1.8.0 (2016-04-14)
9071 ==========================
9076 * Rust supports overloading of compound assignment statements like
9077 `+=` by implementing the [`AddAssign`], [`SubAssign`],
9078 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
9079 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
9081 * Empty structs can be defined with braces, as in `struct Foo { }`, in
9082 addition to the non-braced form, `struct Foo;`. [RFC 218].
9088 * [`str::encode_utf16`] (renamed from `utf16_units`)
9089 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
9092 * [`ptr::drop_in_place`]
9094 * [`time::SystemTime`]
9096 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
9097 * [`Instant::elapsed`]
9098 * [`SystemTime::now`]
9099 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
9100 * [`SystemTime::elapsed`]
9101 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
9102 * [`SystemTimeError`]
9103 * [`SystemTimeError::duration`]
9104 * Various impls for `SystemTimeError`
9106 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
9107 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
9108 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
9109 * [The `write!` and `writeln!` macros correctly emit errors if any of
9110 their arguments can't be formatted][1.8w].
9111 * [Various I/O functions support large files on 32-bit Linux][1.8l].
9112 * [The Unix-specific `raw` modules, which contain a number of
9113 redefined C types are deprecated][1.8r], including `os::raw::unix`,
9114 `os::raw::macos`, and `os::raw::linux`. These modules defined types
9115 such as `ino_t` and `dev_t`. The inconsistency of these definitions
9116 across platforms was making it difficult to implement `std`
9117 correctly. Those that need these definitions should use the `libc`
9119 * The Unix-specific `MetadataExt` traits, including
9120 `os::unix::fs::MetadataExt`, which expose values such as inode
9121 numbers [no longer return platform-specific types][1.8r], but
9122 instead return widened integers. [RFC 1415].
9123 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
9124 * [Atomic loads and stores are not volatile][1.8a].
9125 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
9130 * [Inlining hash functions lead to a 3% compile-time improvement in
9131 some workloads][1.8h].
9132 * When using jemalloc, its symbols are [unprefixed so that it
9133 overrides the libc malloc implementation][1.8h]. This means that for
9134 rustc, LLVM is now using jemalloc, which results in a 6%
9135 compile-time improvement on a specific workload.
9136 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
9141 * [32-bit MSVC builds finally implement unwinding][1.8ms].
9142 i686-pc-windows-msvc is now considered a tier-1 platform.
9143 * [The `--print targets` flag prints a list of supported targets][1.8t].
9144 * [The `--print cfg` flag prints the `cfg`s defined for the current
9146 * [`rustc` can be built with an new Cargo-based build system, written
9147 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
9148 build system. To enable it configure with `configure --rustbuild`.
9149 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
9150 variants while also indicating the total number of missing variants
9151 if more than 3][1.8m].
9152 * [Executable stacks are disabled on Linux and BSD][1.8nx].
9153 * The Rust Project now publishes binary releases of the standard
9154 library for a number of tier-2 targets:
9155 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
9156 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
9157 `x86_64-rumprun-netbsd`. These can be installed with
9158 tools such as [multirust][1.8mr].
9163 * [`cargo init` creates a new Cargo project in the current
9164 directory][1.8ci]. It is otherwise like `cargo new`.
9165 * [Cargo has configuration keys for `-v` and
9166 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
9167 `[term]` section of `.cargo/config`.
9168 * [Configuration keys that evaluate to strings or integers can be set
9169 via environment variables][1.8ce]. For example the `build.jobs` key
9170 can be set via `CARGO_BUILD_JOBS`. Environment variables take
9171 precedence over config files.
9172 * [Target-specific dependencies support Rust `cfg` syntax for
9173 describing targets][1.8cfg] so that dependencies for multiple
9174 targets can be specified together. [RFC 1361].
9175 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
9176 `RUSTDOC` take precedence over the `build.target-dir`,
9177 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
9178 * [The child process tree is killed on Windows when Cargo is
9180 * [The `build.target` configuration value sets the target platform,
9181 like `--target`][1.8ct].
9186 * [Unstable compiler flags have been further restricted][1.8u]. Since
9187 1.0 `-Z` flags have been considered unstable, and other flags that
9188 were considered unstable additionally required passing `-Z
9189 unstable-options` to access. Unlike unstable language and library
9190 features though, these options have been accessible on the stable
9191 release channel. Going forward, *new unstable flags will not be
9192 available on the stable release channel*, and old unstable flags
9193 will warn about their usage. In the future, all unstable flags will
9194 be unavailable on the stable release channel.
9195 * [It is no longer possible to `match` on empty enum variants using
9196 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
9197 * The Unix-specific `MetadataExt` traits, including
9198 `os::unix::fs::MetadataExt`, which expose values such as inode
9199 numbers [no longer return platform-specific types][1.8r], but
9200 instead return widened integers. [RFC 1415].
9201 * [Modules sourced from the filesystem cannot appear within arbitrary
9202 blocks, but only within other modules][1.8mf].
9203 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
9204 * On Unix, [stack overflow triggers a runtime abort instead of a
9206 * [`Command::spawn` and its equivalents return an error if any of
9207 its command-line arguments contain interior `NUL`s][1.8n].
9208 * [Tuple and unit enum variants from other crates are in the type
9210 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
9211 type instead of `.a` files][1.8st]. Additionally, for the MSVC
9212 toolchain, `rustc` emits import libraries named `foo.dll.lib`
9213 instead of `foo.lib`.
9216 [1.8a]: https://github.com/rust-lang/rust/pull/30962
9217 [1.8b]: https://github.com/rust-lang/rust/pull/31123
9218 [1.8c]: https://github.com/rust-lang/rust/pull/31530
9219 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
9220 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
9221 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
9222 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
9223 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
9224 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
9225 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
9226 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
9227 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
9228 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
9229 [1.8h]: https://github.com/rust-lang/rust/pull/31460
9230 [1.8l]: https://github.com/rust-lang/rust/pull/31668
9231 [1.8m]: https://github.com/rust-lang/rust/pull/31020
9232 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
9233 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
9234 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
9235 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
9236 [1.8n]: https://github.com/rust-lang/rust/pull/31056
9237 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
9238 [1.8r]: https://github.com/rust-lang/rust/pull/31551
9239 [1.8so]: https://github.com/rust-lang/rust/pull/31333
9240 [1.8st]: https://github.com/rust-lang/rust/pull/29520
9241 [1.8t]: https://github.com/rust-lang/rust/pull/31358
9242 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
9243 [1.8u]: https://github.com/rust-lang/rust/pull/31793
9244 [1.8v]: https://github.com/rust-lang/rust/pull/31757
9245 [1.8w]: https://github.com/rust-lang/rust/pull/31904
9246 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
9247 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
9248 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
9249 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
9250 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
9251 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
9252 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
9253 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
9254 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
9255 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
9256 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
9257 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
9258 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
9259 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
9260 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
9261 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
9262 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
9263 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
9264 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
9265 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
9266 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
9267 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
9268 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
9269 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
9270 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
9271 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
9272 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
9273 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
9274 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
9275 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
9278 Version 1.7.0 (2016-03-03)
9279 ==========================
9286 * [`Path::strip_prefix`] (renamed from relative_from)
9287 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
9289 * [`Ipv4Addr::is_loopback`]
9290 * [`Ipv4Addr::is_private`]
9291 * [`Ipv4Addr::is_link_local`]
9292 * [`Ipv4Addr::is_multicast`]
9293 * [`Ipv4Addr::is_broadcast`]
9294 * [`Ipv4Addr::is_documentation`]
9296 * [`Ipv6Addr::is_unspecified`]
9297 * [`Ipv6Addr::is_loopback`]
9298 * [`Ipv6Addr::is_multicast`]
9301 * [`Vec::as_mut_slice`]
9303 * [`String::as_str`]
9304 * [`String::as_mut_str`]
9306 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9308 * `<[T]>::`[`sort_by_key`]
9309 * checked, saturated, and overflowing operations
9310 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9311 * [`i32::saturating_mul`]
9312 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9313 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9314 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9315 * [`u32::saturating_mul`]
9316 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9317 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9318 * and checked, saturated, and overflowing operations for other primitive types
9320 * [`ffi::IntoStringError`]
9321 * [`CString::into_string`]
9322 * [`CString::into_bytes`]
9323 * [`CString::into_bytes_with_nul`]
9324 * `From<CString> for Vec<u8>`
9326 * [`IntoStringError::into_cstring`]
9327 * [`IntoStringError::utf8_error`]
9328 * `Error for IntoStringError`
9330 * [`std::hash::BuildHasher`]
9331 * [`BuildHasher::Hasher`]
9332 * [`BuildHasher::build_hasher`]
9333 * [`std::hash::BuildHasherDefault`]
9334 * [`HashMap::with_hasher`]
9335 * [`HashMap::with_capacity_and_hasher`]
9336 * [`HashSet::with_hasher`]
9337 * [`HashSet::with_capacity_and_hasher`]
9338 * [`std::collections::hash_map::RandomState`]
9339 * [`RandomState::new`]
9340 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9341 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9342 from bytes is faster.
9343 * [The performance of `LineWriter` (and thus `io::stdout`) was
9344 improved by using `memchr` to search for newlines][1.7m].
9345 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9346 `f64` variants were stabilized previously.
9347 * [`BTreeMap` was rewritten to use less memory and improve the performance
9348 of insertion and iteration, the latter by as much as 5x][1.7bm].
9349 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9350 covariant over their contained type][1.7bt].
9351 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9352 over their contained type][1.7ll].
9353 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9355 * [`Any` is implemented for unsized types][1.7a].
9356 * [`Hash` is implemented for `Duration`][1.7h].
9361 * [When running tests with `--test`, rustdoc will pass `--cfg`
9362 arguments to the compiler][1.7dt].
9363 * [The compiler is built with RPATH information by default][1.7rpa].
9364 This means that it will be possible to run `rustc` when installed in
9365 unusual configurations without configuring the dynamic linker search
9367 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9368 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9369 over `LD_LIBRARY_PATH`.
9374 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9375 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9376 * [The `rerun-if-changed` build script directive no longer causes the
9377 build script to incorrectly run twice in certain scenarios][1.7rr].
9382 * Soundness fixes to the interactions between associated types and
9383 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9384 code that violates the new rules. This is a significant change that
9385 is known to break existing code, so it has emitted warnings for the
9386 new error cases since 1.4 to give crate authors time to adapt. The
9387 details of what is changing are subtle; read the RFC for more.
9388 * [Several bugs in the compiler's visibility calculations were
9389 fixed][1.7v]. Since this was found to break significant amounts of
9390 code, the new errors will be emitted as warnings for several release
9391 cycles, under the `private_in_public` lint.
9392 * Defaulted type parameters were accidentally accepted in positions
9393 that were not intended. In this release, [defaulted type parameters
9394 appearing outside of type definitions will generate a
9395 warning][1.7d], which will become an error in future releases.
9396 * [Parsing "." as a float results in an error instead of 0][1.7p].
9397 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9398 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9400 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9401 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9402 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9403 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9404 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9405 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9406 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9407 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9408 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9409 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9410 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9411 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9412 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9413 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9414 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9415 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9416 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9417 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9418 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9419 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9420 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9421 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9422 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9423 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9424 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9425 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9426 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9427 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9428 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9429 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9430 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9431 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9432 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9433 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9434 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9435 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9436 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9437 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9438 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9439 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9440 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9441 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9442 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9443 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9444 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9445 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9446 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9447 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9448 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9449 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9450 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9451 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9452 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9453 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9454 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9455 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9456 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9457 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9458 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9459 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9460 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9461 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9462 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9463 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9464 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9465 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9466 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9467 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9468 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9469 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9470 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9471 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9472 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9473 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9474 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9475 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9476 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9477 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9478 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9481 Version 1.6.0 (2016-01-21)
9482 ==========================
9487 * The `#![no_std]` attribute causes a crate to not be linked to the
9488 standard library, but only the [core library][1.6co], as described
9489 in [RFC 1184]. The core library defines common types and traits but
9490 has no platform dependencies whatsoever, and is the basis for Rust
9491 software in environments that cannot support a full port of the
9492 standard library, such as operating systems. Most of the core
9493 library is now stable.
9499 [`Read::read_exact`],
9500 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9501 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9502 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9503 [`os::unix::fs::DirBuilderExt`],
9504 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9505 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9506 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9507 [`collections::hash_map::Drain`],
9508 [`collections::hash_map::HashMap::drain`],
9509 [`collections::hash_set::Drain`],
9510 [`collections::hash_set::HashSet::drain`],
9511 [`collections::binary_heap::Drain`],
9512 [`collections::binary_heap::BinaryHeap::drain`],
9513 [`Vec::extend_from_slice`] (renamed from `push_all`),
9514 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9515 [`RwLock::into_inner`],
9516 [`Iterator::min_by_key`] (renamed from `min_by`),
9517 [`Iterator::max_by_key`] (renamed from `max_by`).
9518 * The [core library][1.6co] is stable, as are most of its APIs.
9519 * [The `assert_eq!` macro supports arguments that don't implement
9520 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9522 * Several timer functions that take duration in milliseconds [are
9523 deprecated in favor of those that take `Duration`][1.6ms]. These
9524 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9525 `thread::park_timeout_ms`.
9526 * The algorithm by which `Vec` reserves additional elements was
9527 [tweaked to not allocate excessive space][1.6a] while still growing
9529 * `From` conversions are [implemented from integers to floats][1.6f]
9530 in cases where the conversion is lossless. Thus they are not
9531 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9532 or `f64`. They are also not implemented for `isize` and `usize`
9533 because the implementations would be platform-specific. `From` is
9534 also implemented from `f32` to `f64`.
9535 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9536 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9537 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9538 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9540 * Sorting slices that are already sorted [is 50% faster in some
9546 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9547 * Cargo build scripts can specify their dependencies by emitting the
9548 [`rerun-if-changed`][1.6rr] key.
9549 * crates.io will reject publication of crates with dependencies that
9550 have a wildcard version constraint. Crates with wildcard
9551 dependencies were seen to cause a variety of problems, as described
9552 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9554 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9555 release folder. A variety of artifacts that Cargo failed to clean
9556 are now correctly deleted.
9561 * The `unreachable_code` lint [warns when a function call's argument
9563 * The parser indicates [failures that may be caused by
9564 confusingly-similar Unicode characters][1.6uc]
9565 * Certain macro errors [are reported at definition time][1.6m], not
9571 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9572 environment variable when locating crates. This was a pre-cargo
9573 feature for integrating with the package manager that was
9574 accidentally never removed.
9575 * [A number of bugs were fixed in the privacy checker][1.6p] that
9576 could cause previously-accepted code to break.
9577 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9578 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9579 struct pattern syntax (`Foo(..)`) can no longer be used to match
9580 unit structs. This is a warning now, but will become an error in
9581 future releases. Patterns that share the same name as a const are
9583 * A bug was fixed that causes [rustc not to apply default type
9584 parameters][1.6xc] when resolving certain method implementations of
9585 traits defined in other crates.
9587 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9588 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9589 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9590 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9591 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9592 [1.6co]: http://doc.rust-lang.org/core/index.html
9593 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9594 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9595 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9596 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9597 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9598 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9599 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9600 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9601 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9602 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9603 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9604 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9605 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9606 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9607 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9608 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9609 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9610 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9611 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9612 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9613 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9614 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9615 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9616 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9617 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9618 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9619 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9620 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9621 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9622 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9623 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9624 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9625 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9626 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9627 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9628 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9629 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9630 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9631 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9632 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9633 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9636 Version 1.5.0 (2015-12-10)
9637 ==========================
9639 * ~700 changes, numerous bugfixes
9645 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9646 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9647 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9648 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9649 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9650 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9651 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9652 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9653 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9654 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9655 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9656 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9657 [`Path::read_link`], [`Path::symlink_metadata`],
9658 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9659 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9660 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9661 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9662 [`slice::split_first_mut`], [`slice::split_first`],
9663 [`slice::split_last_mut`], [`slice::split_last`],
9664 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9665 [`str::MatchIndices`], [`str::RMatchIndices`],
9666 [`str::match_indices`], [`str::rmatch_indices`],
9667 [`str::slice_mut_unchecked`], [`string::ParseError`].
9668 * Rust applications hosted on crates.io can be installed locally to
9669 `~/.cargo/bin` with the [`cargo install`] command. Among other
9670 things this makes it easier to augment Cargo with new subcommands:
9671 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9672 invoked as `cargo foo`.
9673 * Crates with wildcard (`*`) dependencies will [emit warnings when
9674 published][1.5w]. In 1.6 it will no longer be possible to publish
9675 crates with wildcard dependencies.
9680 * The rules determining when a particular lifetime must outlive
9681 a particular value (known as '[dropck]') have been [modified
9682 to not rely on parametricity][1.5p].
9683 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9684 and `Arc`][1.5a]. Because these smart pointer types implement
9685 `Deref`, this causes breakage in cases where the interior type
9686 contains methods of the same name.
9687 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9688 that they could drop their content. Soundness fix.
9689 * All method invocations are [properly checked][1.5wf1] for
9690 [well-formedness][1.5wf2]. Soundness fix.
9691 * Traits whose supertraits contain `Self` are [not object
9692 safe][1.5o]. Soundness fix.
9693 * Target specifications support a [`no_default_libraries`][1.5nd]
9694 setting that controls whether `-nodefaultlibs` is passed to the
9695 linker, and in turn the `is_like_windows` setting no longer affects
9696 the `-nodefaultlibs` flag.
9697 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9698 * The `#[inline]` and `#[repr]` attributes [can only appear
9699 in valid locations][1.5at].
9700 * Native libraries linked from the local crate are [passed to
9701 the linker before native libraries from upstream crates][1.5nl].
9702 * Two rarely-used attributes, `#[no_debug]` and
9703 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9704 * Negation of unsigned integers, which has been a warning for
9705 several releases, [is now behind a feature gate and will
9706 generate errors][1.5nu].
9707 * The parser accidentally accepted visibility modifiers on
9708 enum variants, a bug [which has been fixed][1.5ev].
9709 * [A bug was fixed that allowed `use` statements to import unstable
9715 * When evaluating expressions at compile-time that are not
9716 compile-time constants (const-evaluating expressions in non-const
9717 contexts), incorrect code such as overlong bitshifts and arithmetic
9718 overflow will [generate a warning instead of an error][1.5ce],
9719 delaying the error until runtime. This will allow the
9720 const-evaluator to be expanded in the future backwards-compatibly.
9721 * The `improper_ctypes` lint [no longer warns about using `isize` and
9722 `usize` in FFI][1.5ict].
9727 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9729 * `Default` is [implemented for mutable slices][1.5d].
9730 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9731 * There are now `From` conversions [between floating point
9732 types][1.5f] where the conversions are lossless.
9733 * There are now `From` conversions [between integer types][1.5i] where
9734 the conversions are lossless.
9735 * [`fs::Metadata` implements `Clone`][1.5fs].
9736 * The `parse` method [accepts a leading "+" when parsing
9738 * [`AsMut` is implemented for `Vec`][1.5am].
9739 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9740 been optimized][1.5cf] and no longer rely on the default impl.
9741 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9742 `unsafe extern "C"` function types now [implement `Clone`,
9743 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9744 `fmt::Debug` for up to 12 arguments][1.5fp].
9745 * [Dropping `Vec`s is much faster in unoptimized builds when the
9746 element types don't implement `Drop`][1.5dv].
9747 * A bug that caused in incorrect behavior when [combining `VecDeque`
9748 with zero-sized types][1.5vdz] was resolved.
9749 * [`PartialOrd` for slices is faster][1.5po].
9754 * [Crate metadata size was reduced by 20%][1.5md].
9755 * [Improvements to code generation reduced the size of libcore by 3.3
9756 MB and rustc's memory usage by 18MB][1.5m].
9757 * [Improvements to deref translation increased performance in
9758 unoptimized builds][1.5dr].
9759 * Various errors in trait resolution [are deduplicated to only be
9760 reported once][1.5te].
9761 * Rust has preliminary [support for rumprun kernels][1.5rr].
9762 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9764 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9765 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9766 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9767 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9768 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9769 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9770 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9771 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9772 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9773 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9774 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9775 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9776 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9777 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9778 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9779 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9780 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9781 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9782 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9783 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9784 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9785 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9786 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9787 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9788 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9789 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9790 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9791 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9792 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9793 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9794 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9795 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9796 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9797 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9798 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9799 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9800 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9801 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9802 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9803 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9804 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9805 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9806 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9807 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9808 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9809 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9810 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9811 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9812 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9813 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9814 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9815 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9816 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9817 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9818 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9819 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9820 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9821 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9822 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9823 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9824 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9825 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9826 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9827 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9828 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9829 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9830 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9831 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9832 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9833 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9834 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9835 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9836 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9837 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9838 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9839 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9840 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9841 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9842 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9843 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9844 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9845 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9846 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9847 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9848 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9849 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9850 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9851 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9852 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9854 Version 1.4.0 (2015-10-29)
9855 ==========================
9857 * ~1200 changes, numerous bugfixes
9862 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9863 GNU) are now supported and recommended for use.
9868 * [Several changes have been made to fix type soundness and improve
9869 the behavior of associated types][sound]. See [RFC 1214]. Although
9870 we have mostly introduced these changes as warnings this release, to
9871 become errors next release, there are still some scenarios that will
9872 see immediate breakage.
9873 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9874 line breaks in addition to `\n`][crlf].
9875 * [Loans of `'static` lifetime extend to the end of a function][stat].
9876 * [`str::parse` no longer introduces avoidable rounding error when
9877 parsing floating point numbers. Together with earlier changes to
9878 float formatting/output, "round trips" like f.to_string().parse()
9879 now preserve the value of f exactly. Additionally, leading plus
9880 signs are now accepted][fp3].
9886 * `use` statements that import multiple items [can now rename
9887 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9888 * [Binops work correctly on fat pointers][binfat].
9889 * `pub extern crate`, which does not behave as expected, [issues a
9890 warning][pec] until a better solution is found.
9895 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9896 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9897 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9898 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9899 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9900 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9901 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9902 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9903 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9904 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9905 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9906 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9907 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9908 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9909 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9910 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9911 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9912 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9914 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9915 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9916 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9917 `f64::from_str_radix`.
9918 * [Reverse-searching strings is faster with the 'two-way'
9920 * [`std::io::copy` allows `?Sized` arguments][cc].
9921 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9922 [override `count`, `nth` and `last` with an *O*(1)
9923 implementation][it].
9924 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9925 * [`IntoRawFd` has been added to the Unix-specific prelude,
9926 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9928 * [`Extend<String>` and `FromIterator<String` are both implemented for
9930 * [`IntoIterator` is implemented for references to `Option` and
9932 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9933 Copy`][ext] as part of [RFC 839]. This will cause type inference
9934 breakage in rare situations.
9935 * [`BinaryHeap` implements `Debug`][bh2].
9936 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9938 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9939 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9940 * [String comparison is faster][faststr].
9941 * `&mut T` where `T: std::fmt::Write` [also implements
9942 `std::fmt::Write`][mutw].
9943 * [A stable regression in `VecDeque::push_back` and other
9944 capacity-altering methods that caused panics for zero-sized types
9946 * [Function pointers implement traits for up to 12 parameters][fp2].
9951 * The compiler [no longer uses the 'morestack' feature to prevent
9952 stack overflow][mm]. Instead it uses guard pages and stack
9953 probes (though stack probes are not yet implemented on any platform
9955 * [The compiler matches traits faster when projections are involved][p].
9956 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9958 * [Cargo now displays useful information about what its doing during
9959 `cargo update`][cu].
9961 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9962 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9963 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9964 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9965 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9966 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9967 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9968 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9969 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9970 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9971 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9972 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9973 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9974 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9975 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9976 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9977 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9978 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9979 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9980 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9981 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9982 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9983 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9984 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9985 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9986 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9987 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9988 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9989 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9990 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9991 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9992 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9993 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9994 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9995 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9996 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9997 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9998 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9999 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
10000 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
10001 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
10002 [bh2]: https://github.com/rust-lang/rust/pull/28156
10003 [binfat]: https://github.com/rust-lang/rust/pull/28270
10004 [bm]: https://github.com/rust-lang/rust/pull/28197
10005 [cc]: https://github.com/rust-lang/rust/pull/27531
10006 [crlf]: https://github.com/rust-lang/rust/pull/28034
10007 [cu]: https://github.com/rust-lang/cargo/pull/1931
10008 [d]: https://github.com/rust-lang/rust/pull/27825
10009 [dep]: https://github.com/rust-lang/rust/pull/28339
10010 [es]: https://github.com/rust-lang/rust/pull/27956
10011 [ext]: https://github.com/rust-lang/rust/pull/28094
10012 [faststr]: https://github.com/rust-lang/rust/pull/28338
10013 [ffi]: https://github.com/rust-lang/rust/pull/28779
10014 [fp]: https://github.com/rust-lang/rust/pull/28268
10015 [fp2]: https://github.com/rust-lang/rust/pull/28560
10016 [fp3]: https://github.com/rust-lang/rust/pull/27307
10017 [i]: https://github.com/rust-lang/rust/pull/27451
10018 [into2]: https://github.com/rust-lang/rust/pull/28039
10019 [it]: https://github.com/rust-lang/rust/pull/27652
10020 [mm]: https://github.com/rust-lang/rust/pull/27338
10021 [mutw]: https://github.com/rust-lang/rust/pull/28368
10022 [sound]: https://github.com/rust-lang/rust/pull/27641
10023 [p]: https://github.com/rust-lang/rust/pull/27866
10024 [pec]: https://github.com/rust-lang/rust/pull/28486
10025 [pr]: https://github.com/rust-lang/rust/pull/27896
10026 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10027 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
10028 [s]: https://github.com/rust-lang/rust/pull/27474
10029 [stab]: https://github.com/rust-lang/rust/pull/28339
10030 [stat]: https://github.com/rust-lang/rust/pull/28321
10031 [vd]: https://github.com/rust-lang/rust/pull/28494
10033 Version 1.3.0 (2015-09-17)
10034 ==============================
10036 * ~900 changes, numerous bugfixes
10041 * The [new object lifetime defaults][nold] have been [turned
10042 on][nold2] after a cycle of warnings about the change. Now types
10043 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
10044 being interpreted as `&'a Box<Trait+'a>` to `&'a
10045 Box<Trait+'static>`.
10046 * [The Rustonomicon][nom] is a new book in the official documentation
10047 that dives into writing unsafe Rust.
10048 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
10049 timekeeping is employed by other std APIs, as well as out-of-tree
10055 * The [new object lifetime defaults][nold] have been [turned
10056 on][nold2] after a cycle of warnings about the change.
10057 * There is a known [regression][lr] in how object lifetime elision is
10058 interpreted, the proper solution for which is undetermined.
10059 * The `#[prelude_import]` attribute, an internal implementation
10060 detail, was accidentally stabilized previously. [It has been put
10061 behind the `prelude_import` feature gate][pi]. This change is
10062 believed to break no existing code.
10063 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
10064 [more sane for dynamically sized types][dst3]. Code that relied on
10065 the previous behavior is thought to be broken.
10066 * The `dropck` rules, which checks that destructors can't access
10067 destroyed values, [have been updated][dropck] to match the
10068 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
10069 cause some previously-compiling code to no longer build.
10074 * The [new object lifetime defaults][nold] have been [turned
10075 on][nold2] after a cycle of warnings about the change.
10076 * Semicolons may [now follow types and paths in
10077 macros](https://github.com/rust-lang/rust/pull/27000).
10078 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
10079 [more sane for dynamically sized types][dst3]. Code that relied on
10080 the previous behavior is not known to exist, and suspected to be
10082 * `'static` variables [may now be recursive][st].
10083 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
10084 implementations correctly.
10085 * The `dropck` rules, which checks that destructors can't access
10086 destroyed values, [have been updated][dropck] to match the
10092 * The [`Duration`] API, [has been stabilized][ds], as well as the
10093 `std::time` module, which presently contains only `Duration`.
10094 * `Box<str>` and `Box<[T]>` both implement `Clone`.
10095 * The owned C string, [`CString`], implements [`Borrow`] and the
10096 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
10097 these allow C strings to be borrowed and cloned in generic code.
10098 * [`CStr`] implements [`Debug`].
10099 * [`AtomicPtr`] implements [`Debug`].
10100 * [`Error`] trait objects [can be downcast to their concrete types][e]
10101 in many common configurations, using the [`is`], [`downcast`],
10102 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
10104 * Searching for substrings now [employs the two-way algorithm][search]
10105 instead of doing a naive search. This gives major speedups to a
10106 number of methods, including [`contains`][sc], [`find`][sf],
10107 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
10108 [`ends_with`][sew] are also faster.
10109 * The performance of `PartialEq` for slices is [much faster][ps].
10110 * The [`Hash`] trait offers the default method, [`hash_slice`], which
10111 is overridden and optimized by the implementations for scalars.
10112 * The [`Hasher`] trait now has a number of specialized `write_*`
10113 methods for primitive types, for efficiency.
10114 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
10115 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
10116 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
10117 of [`std::error::Error::cause`][iec] also delegates to the inner
10119 * [`process::Child`][pc] gained the [`id`] method, which returns a
10120 `u32` representing the platform-specific process identifier.
10121 * The [`connect`] method on slices is deprecated, replaced by the new
10122 [`join`] method (note that both of these are on the *unstable*
10123 [`SliceConcatExt`] trait, but through the magic of the prelude are
10124 available to stable code anyway).
10125 * The [`Div`] operator is implemented for [`Wrapping`] types.
10126 * [`DerefMut` is implemented for `String`][dms].
10127 * Performance of SipHash (the default hasher for `HashMap`) is
10128 [better for long data][sh].
10129 * [`AtomicPtr`] implements [`Send`].
10130 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
10131 are now [specialized to use uninitialized buffers for increased
10133 * Lifetime parameters of foreign functions [are now resolved
10139 * Rust can now, with some coercion, [produce programs that run on
10140 Windows XP][xp], though XP is not considered a supported platform.
10141 * Porting Rust on Windows from the GNU toolchain to MSVC continues
10142 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
10143 recommended for use in 1.3, though should be fully-functional
10144 in the [64-bit 1.4 beta][b14].
10145 * On Fedora-based systems installation will [properly configure the
10146 dynamic linker][fl].
10147 * The compiler gained many new extended error descriptions, which can
10148 be accessed with the `--explain` flag.
10149 * The `dropck` pass, which checks that destructors can't access
10150 destroyed values, [has been rewritten][27261]. This fixes some
10151 soundness holes, and as such will cause some previously-compiling
10152 code to no longer build.
10153 * `rustc` now uses [LLVM to write archive files where possible][ar].
10154 Eventually this will eliminate the compiler's dependency on the ar
10156 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
10157 supported FreeBSD on x86_64).
10158 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
10159 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
10161 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
10162 will kill the process instead of leaking][nlp].
10164 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
10165 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
10166 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
10167 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
10168 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
10169 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10170 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10171 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
10172 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
10173 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
10174 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
10175 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
10176 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
10177 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
10178 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
10179 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
10180 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
10181 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
10182 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10183 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
10184 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
10185 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
10186 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
10187 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
10188 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
10189 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
10190 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
10191 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
10192 [ar]: https://github.com/rust-lang/rust/pull/26926
10193 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
10194 [dms]: https://github.com/rust-lang/rust/pull/26241
10195 [27261]: https://github.com/rust-lang/rust/pull/27261
10196 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10197 [ds]: https://github.com/rust-lang/rust/pull/26818
10198 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
10199 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
10200 [dst3]: https://github.com/rust-lang/rust/pull/27351
10201 [e]: https://github.com/rust-lang/rust/pull/24793
10202 [f]: https://github.com/rust-lang/rust/pull/26588
10203 [26959]: https://github.com/rust-lang/rust/pull/26959
10204 [fl]: https://github.com/rust-lang/rust-installer/pull/41
10205 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
10206 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
10207 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
10208 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
10209 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
10210 [lic]: https://github.com/rust-lang/rust/pull/26583
10211 [lnu]: https://github.com/rust-lang/rust/pull/27026
10212 [lr]: https://github.com/rust-lang/rust/issues/27248
10213 [lum]: https://github.com/rust-lang/rust/pull/26378
10214 [lur]: https://github.com/rust-lang/rust/pull/26783
10215 [nlp]: https://github.com/rust-lang/rust/pull/27176
10216 [nold2]: https://github.com/rust-lang/rust/pull/27045
10217 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
10218 [nom]: http://doc.rust-lang.org/nightly/nomicon/
10219 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
10220 [pi]: https://github.com/rust-lang/rust/pull/26699
10221 [ps]: https://github.com/rust-lang/rust/pull/26884
10222 [rte]: https://github.com/rust-lang/rust/pull/26950
10223 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
10224 [search]: https://github.com/rust-lang/rust/pull/26327
10225 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
10226 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
10227 [sh]: https://github.com/rust-lang/rust/pull/27280
10228 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
10229 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
10230 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
10231 [st]: https://github.com/rust-lang/rust/pull/26630
10232 [win1]: https://github.com/rust-lang/rust/pull/26569
10233 [win2]: https://github.com/rust-lang/rust/pull/26741
10234 [win3]: https://github.com/rust-lang/rust/pull/26741
10235 [win4]: https://github.com/rust-lang/rust/pull/27210
10236 [xp]: https://github.com/rust-lang/rust/pull/26569
10238 Version 1.2.0 (2015-08-07)
10239 ==========================
10241 * ~1200 changes, numerous bugfixes
10246 * [Dynamically-sized-type coercions][dst] allow smart pointer types
10247 like `Rc` to contain types without a fixed size, arrays and trait
10248 objects, finally enabling use of `Rc<[T]>` and completing the
10249 implementation of DST.
10250 * [Parallel codegen][parcodegen] is now working again, which can
10251 substantially speed up large builds in debug mode; It also gets
10252 another ~33% speedup when bootstrapping on a 4 core machine (using 8
10253 jobs). It's not enabled by default, but will be "in the near
10254 future". It can be activated with the `-C codegen-units=N` flag to
10256 * This is the first release with [experimental support for linking
10257 with the MSVC linker and lib C on Windows (instead of using the GNU
10258 variants via MinGW)][win]. It is yet recommended only for the most
10259 intrepid Rustaceans.
10260 * Benchmark compilations are showing a 30% improvement in
10261 bootstrapping over 1.1.
10266 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
10267 unicode case mapping, which is a previously-planned change in
10268 behavior and considered a bugfix.
10269 * [`mem::align_of`] now specifies [the *minimum alignment* for
10270 T][align], which is usually the alignment programs are interested
10271 in, and the same value reported by clang's
10272 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
10274 * [The `#[packed]` attribute is no longer silently accepted by the
10275 compiler][packed]. This attribute did nothing and code that
10276 mentioned it likely did not work as intended.
10277 * Associated type defaults are [now behind the
10278 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
10279 defaults *did not work*, but could be mentioned syntactically. As
10280 such this breakage has minimal impact.
10285 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
10286 matching against dereferenceable values.
10291 * The [`Extend`] trait, which grows a collection from an iterator, is
10292 implemented over iterators of references, for `String`, `Vec`,
10293 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
10294 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
10295 * The [`iter::once`] function returns an iterator that yields a single
10296 element, and [`iter::empty`] returns an iterator that yields no
10298 * The [`matches`] and [`rmatches`] methods on `str` return iterators
10299 over substring matches.
10300 * [`Cell`] and [`RefCell`] both implement `Eq`.
10301 * A number of methods for wrapping arithmetic are added to the
10302 integral types, [`wrapping_div`], [`wrapping_rem`],
10303 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10304 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10305 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10306 type.. It is illegal for the default arithmetic operations in Rust
10307 to overflow; the desire to wrap must be explicit.
10308 * The `{:#?}` formatting specifier [displays the alternate,
10309 pretty-printed][debugfmt] form of the `Debug` formatter. This
10310 feature was actually introduced prior to 1.0 with little
10312 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10313 for writing data to formatted strings, similar to [`io::Write`].
10314 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10315 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10316 are used by code generators to emit implementations of [`Debug`].
10317 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10318 methods that convert case, following Unicode case mapping.
10319 * It is now easier to handle poisoned locks. The [`PoisonError`]
10320 type, returned by failing lock operations, exposes `into_inner`,
10321 `get_ref`, and `get_mut`, which all give access to the inner lock
10322 guard, and allow the poisoned lock to continue to operate. The
10323 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10324 poisoned lock without attempting to take the lock.
10325 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10326 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10327 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10328 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10330 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10336 * `rustc` employs smarter heuristics for guessing at [typos].
10337 * `rustc` emits more efficient code for [no-op conversions between
10338 unsafe pointers][nop].
10339 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10340 resulting in faster compile times and smaller code.
10342 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10343 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10344 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10345 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10346 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10347 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10348 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10349 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10350 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10351 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10352 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10353 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10354 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10355 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10356 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10357 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10358 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10359 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10360 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10361 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10362 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10363 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10364 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10365 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10366 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10367 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10368 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10369 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10370 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10371 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10372 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10373 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10374 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10375 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10376 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10377 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10378 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10379 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10380 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10381 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10382 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10383 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10384 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10385 [align]: https://github.com/rust-lang/rust/pull/25646
10386 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10387 [typos]: https://github.com/rust-lang/rust/pull/26087
10388 [nop]: https://github.com/rust-lang/rust/pull/26336
10389 [fat]: https://github.com/rust-lang/rust/pull/26411
10390 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10391 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10392 [packed]: https://github.com/rust-lang/rust/pull/25541
10393 [ad]: https://github.com/rust-lang/rust/pull/27382
10394 [win]: https://github.com/rust-lang/rust/pull/25350
10396 Version 1.1.0 (2015-06-25)
10397 =========================
10399 * ~850 changes, numerous bugfixes
10404 * The [`std::fs` module has been expanded][fs] to expand the set of
10405 functionality exposed:
10406 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10407 don't incur a syscall on some platforms.
10408 * A `symlink_metadata` function has been added.
10409 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10410 access to all underlying information.
10411 * The compiler now contains extended explanations of many errors. When an error
10412 with an explanation occurs the compiler suggests using the `--explain` flag
10413 to read the explanation. Error explanations are also [available online][err-index].
10414 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10415 well as other work, the time to bootstrap the compiler decreased by
10421 * The [`str::split_whitespace`] method splits a string on unicode
10422 whitespace boundaries.
10423 * On both Windows and Unix, new extension traits provide conversion of
10424 I/O types to and from the underlying system handles. On Unix, these
10425 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10426 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10427 `TcpListener`, and `UpdSocket`. Further implementations for
10428 `std::process` will be stabilized later.
10429 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10430 Windows, symlinks can be created with
10431 `std::os::windows::symlink_dir` and
10432 `std::os::windows::symlink_file`.
10433 * The `mpsc::Receiver` type can now be converted into an iterator with
10434 `into_iter` on the [`IntoIterator`] trait.
10435 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10436 implementation of the [`From`] trait.
10437 * The `Debug` implementation for `RangeFull` [creates output that is
10438 more consistent with other implementations][rf].
10439 * [`Debug` is implemented for `File`][file].
10440 * The `Default` implementation for `Arc` [no longer requires `Sync +
10442 * [The `Iterator` methods `count`, `nth`, and `last` have been
10443 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10444 * Incorrect handling of paths on Windows has been improved in both the
10445 compiler and the standard library.
10446 * [`AtomicPtr` gained a `Default` implementation][ap].
10447 * In accordance with Rust's policy on arithmetic overflow `abs` now
10448 [panics on overflow when debug assertions are enabled][abs].
10449 * The [`Cloned`] iterator, which was accidentally left unstable for
10450 1.0 [has been stabilized][c].
10451 * The [`Incoming`] iterator, which iterates over incoming TCP
10452 connections, and which was accidentally unnamable in 1.0, [is now
10453 properly exported][inc].
10454 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10455 `sift_up` or `sift_down` panic][bh].
10456 * The [`split_off`] method of `LinkedList` [no longer corrupts
10457 the list in certain scenarios][ll].
10462 * Type checking performance [has improved notably][sk] with
10463 [multiple improvements][pre].
10464 * The compiler [suggests code changes][ch] for more errors.
10465 * rustc and it's build system have experimental support for [building
10466 toolchains against MUSL][m] instead of glibc on Linux.
10467 * The compiler defines the `target_env` cfg value, which is used for
10468 distinguishing toolchains that are otherwise for the same
10469 platform. Presently this is set to `gnu` for common GNU Linux
10470 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10471 * The [`cargo rustc`][crc] command invokes a build with custom flags
10473 * [Android executables are always position independent][pie].
10474 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10475 with `Drop`][24935].
10477 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10478 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10479 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10480 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10481 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10482 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10483 [rf]: https://github.com/rust-lang/rust/pull/24491
10484 [err-index]: https://doc.rust-lang.org/error-index.html
10485 [sk]: https://github.com/rust-lang/rust/pull/24615
10486 [pre]: https://github.com/rust-lang/rust/pull/25323
10487 [file]: https://github.com/rust-lang/rust/pull/24598
10488 [ch]: https://github.com/rust-lang/rust/pull/24683
10489 [arc]: https://github.com/rust-lang/rust/pull/24695
10490 [si]: https://github.com/rust-lang/rust/pull/24701
10491 [ap]: https://github.com/rust-lang/rust/pull/24834
10492 [m]: https://github.com/rust-lang/rust/pull/24777
10493 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10494 [crc]: https://github.com/rust-lang/cargo/pull/1568
10495 [pie]: https://github.com/rust-lang/rust/pull/24953
10496 [abs]: https://github.com/rust-lang/rust/pull/25441
10497 [c]: https://github.com/rust-lang/rust/pull/25496
10498 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10499 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10500 [inc]: https://github.com/rust-lang/rust/pull/25522
10501 [bh]: https://github.com/rust-lang/rust/pull/25856
10502 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10503 [ll]: https://github.com/rust-lang/rust/pull/26022
10504 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10505 [24935]: https://github.com/rust-lang/rust/pull/24935
10507 Version 1.0.0 (2015-05-15)
10508 ========================
10510 * ~1500 changes, numerous bugfixes
10515 * The vast majority of the standard library is now `#[stable]`. It is
10516 no longer possible to use unstable features with a stable build of
10518 * Many popular crates on [crates.io] now work on the stable release
10520 * Arithmetic on basic integer types now [checks for overflow in debug
10526 * Several [restrictions have been added to trait coherence][coh] in
10527 order to make it easier for upstream authors to change traits
10528 without breaking downstream code.
10529 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10530 improve error messages and macro behavior. For example, `0b1234` is
10531 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10532 * Trait bounds [are always invariant][inv], eliminating the need for
10533 the `PhantomFn` and `MarkerTrait` lang items, which have been
10535 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10536 "foo" as bar` syntax has been replaced with `extern crate foo as
10537 bar`, and Cargo now automatically translates "-" in *package* names
10538 to underscore for the crate name.
10539 * [Lifetime shadowing is an error][lt].
10540 * [`Send` no longer implies `'static`][send-rfc].
10541 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10542 `MyType::default()`.
10543 * Primitive types [now have inherent methods][prim-inherent],
10544 obviating the need for extension traits like `SliceExt`.
10545 * Methods with `Self: Sized` in their `where` clause are [considered
10546 object-safe][self-sized], allowing many extension traits like
10547 `IteratorExt` to be merged into the traits they extended.
10548 * You can now [refer to associated types][assoc-where] whose
10549 corresponding trait bounds appear only in a `where` clause.
10550 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10551 like `Send` and `Sync` are now library-defined.
10552 * A [Reflect trait][reflect] was introduced, which means that
10553 downcasting via the `Any` trait is effectively limited to concrete
10554 types. This helps retain the potentially-important "parametricity"
10555 property: generic code cannot behave differently for different type
10556 arguments except in minor ways.
10557 * The `unsafe_destructor` feature is now deprecated in favor of the
10558 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10564 * The `thread_local` module [has been renamed to `std::thread`][th].
10565 * The methods of `IteratorExt` [have been moved to the `Iterator`
10566 trait itself][23300].
10567 * Several traits that implement Rust's conventions for type
10568 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10569 [centralized in the `std::convert` module][con].
10570 * The `FromError` trait [was removed in favor of `From`][fe].
10571 * The basic sleep function [has moved to
10572 `std::thread::sleep_ms`][slp].
10573 * The `splitn` function now takes an `n` parameter that represents the
10574 number of items yielded by the returned iterator [instead of the
10575 number of 'splits'][spl].
10576 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10577 * [Derived implementations of `PartialOrd` now order enums according
10578 to their explicitly-assigned discriminants][po].
10579 * [Methods for searching strings are generic over `Pattern`s][pat],
10580 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10582 * [In method resolution, object methods are resolved before inherent
10584 * [`String::from_str` has been deprecated in favor of the `From` impl,
10585 `String::from`][24517].
10586 * [`io::Error` implements `Sync`][ios].
10587 * [The `words` method on `&str` has been replaced with
10588 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10590 * The new path and IO modules are complete and `#[stable]`. This
10591 was the major library focus for this cycle.
10592 * The path API was [revised][path-normalize] to normalize `.`,
10593 adjusting the tradeoffs in favor of the most common usage.
10594 * A large number of remaining APIs in `std` were also stabilized
10595 during this cycle; about 75% of the non-deprecated API surface
10597 * The new [string pattern API][string-pattern] landed, which makes
10598 the string slice API much more internally consistent and flexible.
10599 * A new set of [generic conversion traits][conversion] replaced
10600 many existing ad hoc traits.
10601 * Generic numeric traits were [completely removed][num-traits]. This
10602 was made possible thanks to inherent methods for primitive types,
10603 and the removal gives maximal flexibility for designing a numeric
10604 hierarchy in the future.
10605 * The `Fn` traits are now related via [inheritance][fn-inherit]
10606 and provide ergonomic [blanket implementations][fn-blanket].
10607 * The `Index` and `IndexMut` traits were changed to
10608 [take the index by value][index-value], enabling code like
10609 `hash_map["string"]` to work.
10610 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10611 `Copy` data is known to be `Clone` as well.
10616 * Many errors now have extended explanations that can be accessed with
10617 the `--explain` flag to `rustc`.
10618 * Many new examples have been added to the standard library
10620 * rustdoc has received a number of improvements focused on completion
10622 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10623 * Much headway was made on ecosystem-wide CI, making it possible
10624 to [compare builds for breakage][ci-compare].
10627 [crates.io]: http://crates.io
10628 [clo]: https://github.com/rust-lang/rust/pull/24034
10629 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10630 [con]: https://github.com/rust-lang/rust/pull/23875
10631 [cr]: https://github.com/rust-lang/rust/pull/23419
10632 [fe]: https://github.com/rust-lang/rust/pull/23879
10633 [23300]: https://github.com/rust-lang/rust/pull/23300
10634 [inv]: https://github.com/rust-lang/rust/pull/23938
10635 [ios]: https://github.com/rust-lang/rust/pull/24133
10636 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10637 [lt]: https://github.com/rust-lang/rust/pull/24057
10638 [meth]: https://github.com/rust-lang/rust/pull/24056
10639 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10640 [po]: https://github.com/rust-lang/rust/pull/24270
10641 [24517]: https://github.com/rust-lang/rust/pull/24517
10642 [slp]: https://github.com/rust-lang/rust/pull/23949
10643 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10644 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10645 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10646 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10647 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10648 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10649 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10650 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10651 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10652 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10653 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10654 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10655 [reflect]: https://github.com/rust-lang/rust/pull/23712
10656 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10657 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10658 [index-value]: https://github.com/rust-lang/rust/pull/23601
10659 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10660 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10661 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10662 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10663 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10664 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10667 Version 1.0.0-alpha.2 (2015-02-20)
10668 =====================================
10670 * ~1300 changes, numerous bugfixes
10674 * The various I/O modules were [overhauled][io-rfc] to reduce
10675 unnecessary abstractions and provide better interoperation with
10676 the underlying platform. The old `io` module remains temporarily
10678 * The standard library now [participates in feature gating][feat],
10679 so use of unstable libraries now requires a `#![feature(...)]`
10680 attribute. The impact of this change is [described on the
10681 forum][feat-forum]. [RFC][feat-rfc].
10685 * `for` loops [now operate on the `IntoIterator` trait][into],
10686 which eliminates the need to call `.iter()`, etc. to iterate
10687 over collections. There are some new subtleties to remember
10688 though regarding what sort of iterators various types yield, in
10689 particular that `for foo in bar { }` yields values from a move
10690 iterator, destroying the original collection. [RFC][into-rfc].
10691 * Objects now have [default lifetime bounds][obj], so you don't
10692 have to write `Box<Trait+'static>` when you don't care about
10693 storing references. [RFC][obj-rfc].
10694 * In types that implement `Drop`, [lifetimes must outlive the
10695 value][drop]. This will soon make it possible to safely
10696 implement `Drop` for types where `#[unsafe_destructor]` is now
10697 required. Read the [gorgeous RFC][drop-rfc] for details.
10698 * The fully qualified <T as Trait>::X syntax lets you set the Self
10699 type for a trait method or associated type. [RFC][ufcs-rfc].
10700 * References to types that implement `Deref<U>` now [automatically
10701 coerce to references][deref] to the dereferenced type `U`,
10702 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10703 should eliminate many unsightly uses of `&*`, as when converting
10704 from references to vectors into references to
10705 slices. [RFC][deref-rfc].
10706 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10707 `|:|`) is obsolete and closure kind is inferred from context.
10708 * [`Self` is a keyword][Self].
10712 * The `Show` and `String` formatting traits [have been
10713 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10714 their related purposes. Automatically getting a string
10715 conversion to use with `format!("{:?}", something_to_debug)` is
10716 now written `#[derive(Debug)]`.
10717 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10718 OsStr}`, provide strings in platform-specific encodings for easier
10719 interop with system APIs. [RFC][osstr-rfc].
10720 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10721 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10722 creating raw pointers.
10726 * Certain long error messages of the form 'expected foo found bar'
10727 are now [split neatly across multiple
10728 lines][multiline]. Examples in the PR.
10729 * On Unix Rust can be [uninstalled][un] by running
10730 `/usr/local/lib/rustlib/uninstall.sh`.
10731 * The `#[rustc_on_unimplemented]` attribute, requiring the
10732 'on_unimplemented' feature, lets rustc [display custom error
10733 messages when a trait is expected to be implemented for a type
10738 * Rust is tested against a [LALR grammar][lalr], which parses
10739 almost all the Rust files that rustc does.
10741 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10742 [close]: https://github.com/rust-lang/rust/pull/21843
10743 [deref]: https://github.com/rust-lang/rust/pull/21351
10744 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10745 [drop]: https://github.com/rust-lang/rust/pull/21972
10746 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10747 [feat]: https://github.com/rust-lang/rust/pull/21248
10748 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10749 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10750 [fmt]: https://github.com/rust-lang/rust/pull/21457
10751 [into]: https://github.com/rust-lang/rust/pull/20790
10752 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10753 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10754 [lalr]: https://github.com/rust-lang/rust/pull/21452
10755 [multiline]: https://github.com/rust-lang/rust/pull/19870
10756 [obj]: https://github.com/rust-lang/rust/pull/22230
10757 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10758 [onun]: https://github.com/rust-lang/rust/pull/20889
10759 [osstr]: https://github.com/rust-lang/rust/pull/21488
10760 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10761 [Self]: https://github.com/rust-lang/rust/pull/22158
10762 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10763 [un]: https://github.com/rust-lang/rust/pull/22256
10766 Version 1.0.0-alpha (2015-01-09)
10767 ==================================
10769 * ~2400 changes, numerous bugfixes
10773 * The language itself is considered feature complete for 1.0,
10774 though there will be many usability improvements and bugfixes
10775 before the final release.
10776 * Nearly 50% of the public API surface of the standard library has
10777 been declared 'stable'. Those interfaces are unlikely to change
10779 * The long-running debate over integer types has been
10780 [settled][ints]: Rust will ship with types named `isize` and
10781 `usize`, rather than `int` and `uint`, for pointer-sized
10782 integers. Guidelines will be rolled out during the alpha cycle.
10783 * Most crates that are not `std` have been moved out of the Rust
10784 distribution into the Cargo ecosystem so they can evolve
10785 separately and don't need to be stabilized as quickly, including
10786 'time', 'getopts', 'num', 'regex', and 'term'.
10787 * Documentation continues to be expanded with more API coverage, more
10788 examples, and more in-depth explanations. The guides have been
10789 consolidated into [The Rust Programming Language][trpl].
10790 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10791 * All official Rust binary installers now come with [Cargo], the
10792 Rust package manager.
10796 * Closures have been [completely redesigned][unboxed] to be
10797 implemented in terms of traits, can now be used as generic type
10798 bounds and thus monomorphized and inlined, or via an opaque
10799 pointer (boxed) as in the old system. The new system is often
10800 referred to as 'unboxed' closures.
10801 * Traits now support [associated types][assoc], allowing families
10802 of related types to be defined together and used generically in
10804 * Enum variants are [namespaced by their type names][enum].
10805 * [`where` clauses][where] provide a more versatile and attractive
10806 syntax for specifying generic bounds, though the previous syntax
10808 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10810 * Rust [no longer has a runtime][rt] of any description, and only
10811 supports OS threads, not green threads.
10812 * At long last, Rust has been overhauled for 'dynamically-sized
10813 types' ([DST]), which integrates 'fat pointers' (object types,
10814 arrays, and `str`) more deeply into the type system, making it
10816 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10817 `..j` that produce range types and which, when combined with the
10818 `Index` operator and multidispatch, leads to a convenient slice
10819 notation, `[i..j]`.
10820 * The new range syntax revealed an ambiguity in the fixed-length
10821 array syntax, so now fixed length arrays [are written `[T;
10823 * The `Copy` trait is no longer implemented automatically. Unsafe
10824 pointers no longer implement `Sync` and `Send` so types
10825 containing them don't automatically either. `Sync` and `Send`
10826 are now 'unsafe traits' so one can "forcibly" implement them via
10827 `unsafe impl` if a type confirms to the requirements for them
10828 even though the internals do not (e.g. structs containing unsafe
10829 pointers like `Arc`). These changes are intended to prevent some
10830 footguns and are collectively known as [opt-in built-in
10831 traits][oibit] (though `Sync` and `Send` will soon become pure
10832 library types unknown to the compiler).
10833 * Operator traits now take their operands [by value][ops], and
10834 comparison traits can use multidispatch to compare one type
10835 against multiple other types, allowing e.g. `String` to be
10836 compared with `&str`.
10837 * `if let` and `while let` are no longer feature-gated.
10838 * Rust has adopted a more [uniform syntax for escaping unicode
10839 characters][unicode].
10840 * `macro_rules!` [has been declared stable][mac]. Though it is a
10841 flawed system it is sufficiently popular that it must be usable
10842 for 1.0. Effort has gone into [future-proofing][mac-future] it
10843 in ways that will allow other macro systems to be developed in
10844 parallel, and won't otherwise impact the evolution of the
10846 * The prelude has been [pared back significantly][prelude] such
10847 that it is the minimum necessary to support the most pervasive
10848 code patterns, and through [generalized where clauses][where]
10849 many of the prelude extension traits have been consolidated.
10850 * Rust's rudimentary reflection [has been removed][refl], as it
10851 incurred too much code generation for little benefit.
10852 * [Struct variants][structvars] are no longer feature-gated.
10853 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10854 known as 'higher-ranked trait bounds', this crucially allows
10855 unboxed closures to work.
10856 * Macros invocations surrounded by parens or square brackets and
10857 not terminated by a semicolon are [parsed as
10858 expressions][macros], which makes expressions like `vec![1i32,
10859 2, 3].len()` work as expected.
10860 * Trait objects now implement their traits automatically, and
10861 traits that can be coerced to objects now must be [object
10863 * Automatically deriving traits is now done with `#[derive(...)]`
10864 not `#[deriving(...)]` for [consistency with other naming
10865 conventions][derive].
10866 * Importing the containing module or enum at the same time as
10867 items or variants they contain is [now done with `self` instead
10868 of `mod`][self], as in use `foo::{self, bar}`
10869 * Glob imports are no longer feature-gated.
10870 * The `box` operator and `box` patterns have been feature-gated
10871 pending a redesign. For now unique boxes should be allocated
10872 like other containers, with `Box::new`.
10876 * A [series][coll1] of [efforts][coll2] to establish
10877 [conventions][coll3] for collections types has resulted in API
10878 improvements throughout the standard library.
10879 * New [APIs for error handling][err] provide ergonomic interop
10880 between error types, and [new conventions][err-conv] describe
10881 more clearly the recommended error handling strategies in Rust.
10882 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10883 it is easier to discuss failure in the context of error handling
10884 without making clarifications as to whether you are referring to
10885 the 'fail' macro or failure more generally.
10886 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10887 syscall when available.
10888 * The 'serialize' crate has been renamed 'rustc-serialize' and
10889 moved out of the distribution to Cargo. Although it is widely
10890 used now, it is expected to be superseded in the near future.
10891 * The `Show` formatter, typically implemented with
10892 `#[derive(Show)]` is [now requested with the `{:?}`
10893 specifier][show] and is intended for use by all types, for uses
10894 such as `println!` debugging. The new `String` formatter must be
10895 implemented by hand, uses the `{}` specifier, and is intended
10896 for full-fidelity conversions of things that can logically be
10897 represented as strings.
10901 * [Flexible target specification][flex] allows rustc's code
10902 generation to be configured to support otherwise-unsupported
10904 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10905 respective debuggers with Rust-appropriate pretty-printing.
10906 * The Windows installation of Rust is distributed with the
10907 MinGW components currently required to link binaries on that
10912 * Nullable enum optimizations have been extended to more types so
10913 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10914 space than the inner types themselves.
10915 * Work has begun on supporting AArch64.
10917 [Cargo]: https://crates.io
10918 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10919 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10920 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10921 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10922 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10923 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10924 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10925 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10926 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10927 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10928 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10929 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10930 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10931 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10932 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10933 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10934 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10935 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10936 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10937 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10938 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10939 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10940 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10941 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10942 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10943 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10944 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10945 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10946 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10947 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10948 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10949 [trpl]: https://doc.rust-lang.org/book/index.html
10950 [rbe]: http://rustbyexample.com/
10953 Version 0.12.0 (2014-10-09)
10954 =============================
10956 * ~1900 changes, numerous bugfixes
10960 * The introductory documentation (now called The Rust Guide) has
10961 been completely rewritten, as have a number of supplementary
10963 * Rust's package manager, Cargo, continues to improve and is
10964 sometimes considered to be quite awesome.
10965 * Many API's in `std` have been reviewed and updated for
10966 consistency with the in-development Rust coding
10967 guidelines. The standard library documentation tracks
10968 stabilization progress.
10969 * Minor libraries have been moved out-of-tree to the rust-lang org
10970 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10971 be installed with Cargo.
10972 * Lifetime elision allows lifetime annotations to be left off of
10973 function declarations in many common scenarios.
10974 * Rust now works on 64-bit Windows.
10977 * Indexing can be overloaded with the `Index` and `IndexMut`
10979 * The `if let` construct takes a branch only if the `let` pattern
10980 matches, currently behind the 'if_let' feature gate.
10981 * 'where clauses', a more flexible syntax for specifying trait
10982 bounds that is more aesthetic, have been added for traits and
10983 free functions. Where clauses will in the future make it
10984 possible to constrain associated types, which would be
10985 impossible with the existing syntax.
10986 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10987 the 'slicing_syntax' feature gate, and can be overloaded with
10988 the `Slice` or `SliceMut` traits.
10989 * The syntax for matching of sub-slices has been changed to use a
10990 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10991 consistency with other uses of `..` and to future-proof
10992 potential additional uses of the syntax.
10993 * The syntax for matching inclusive ranges in patterns has changed
10994 from `0..3` to `0...4` to be consistent with the exclusive range
10995 syntax for slicing.
10996 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10997 c]`) has been put behind the 'advanced_slice_patterns' feature
10998 gate and may be removed in the future.
10999 * Components of tuples and tuple structs can be extracted using
11000 the `value.0` syntax, currently behind the `tuple_indexing`
11002 * The `#[crate_id]` attribute is no longer supported; versioning
11003 is handled by the package manager.
11004 * Renaming crate imports are now written `extern crate foo as bar`
11005 instead of `extern crate bar = foo`.
11006 * Renaming use statements are now written `use foo as bar` instead
11007 of `use bar = foo`.
11008 * `let` and `match` bindings and argument names in macros are now
11010 * The new, more efficient, closure types ('unboxed closures') have
11011 been added under a feature gate, 'unboxed_closures'. These will
11012 soon replace the existing closure types, once higher-ranked
11013 trait lifetimes are added to the language.
11014 * `move` has been added as a keyword, for indicating closures
11015 that capture by value.
11016 * Mutation and assignment is no longer allowed in pattern guards.
11017 * Generic structs and enums can now have trait bounds.
11018 * The `Share` trait is now called `Sync` to free up the term
11019 'shared' to refer to 'shared reference' (the default reference
11021 * Dynamically-sized types have been mostly implemented,
11022 unifying the behavior of fat-pointer types with the rest of the
11024 * As part of dynamically-sized types, the `Sized` trait has been
11025 introduced, which qualifying types implement by default, and
11026 which type parameters expect by default. To specify that a type
11027 parameter does not need to be sized, write `<Sized? T>`. Most
11028 types are `Sized`, notable exceptions being unsized arrays
11029 (`[T]`) and trait types.
11030 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
11031 * Lifetime bounds can now be applied to type parameters and object
11033 * The old, reference counted GC type, `Gc<T>` which was once
11034 denoted by the `@` sigil, has finally been removed. GC will be
11035 revisited in the future.
11038 * Library documentation has been improved for a number of modules.
11039 * Bit-vectors, collections::bitv has been modernized.
11040 * The url crate is deprecated in favor of
11041 http://github.com/servo/rust-url, which can be installed with
11043 * Most I/O stream types can be cloned and subsequently closed from
11044 a different thread.
11045 * A `std::time::Duration` type has been added for use in I/O
11046 methods that rely on timers, as well as in the 'time' crate's
11047 `Timespec` arithmetic.
11048 * The runtime I/O abstraction layer that enabled the green thread
11049 scheduler to do non-thread-blocking I/O has been removed, along
11050 with the libuv-based implementation employed by the green thread
11051 scheduler. This will greatly simplify the future I/O work.
11052 * `collections::btree` has been rewritten to have a more
11053 idiomatic and efficient design.
11056 * rustdoc output now indicates the stability levels of API's.
11057 * The `--crate-name` flag can specify the name of the crate
11058 being compiled, like `#[crate_name]`.
11059 * The `-C metadata` specifies additional metadata to hash into
11060 symbol names, and `-C extra-filename` specifies additional
11061 information to put into the output filename, for use by the
11062 package manager for versioning.
11063 * debug info generation has continued to improve and should be
11064 more reliable under both gdb and lldb.
11065 * rustc has experimental support for compiling in parallel
11066 using the `-C codegen-units` flag.
11067 * rustc no longer encodes rpath information into binaries by
11071 * Stack usage has been optimized with LLVM lifetime annotations.
11072 * Official Rust binaries on Linux are more compatible with older
11073 kernels and distributions, built on CentOS 5.10.
11076 Version 0.11.0 (2014-07-02)
11077 ==========================
11079 * ~1700 changes, numerous bugfixes
11082 * ~[T] has been removed from the language. This type is superseded by
11084 * ~str has been removed from the language. This type is superseded by
11086 * ~T has been removed from the language. This type is superseded by the
11088 * @T has been removed from the language. This type is superseded by the
11089 standard library's std::gc::Gc<T> type.
11090 * Struct fields are now all private by default.
11091 * Vector indices and shift amounts are both required to be a `uint`
11092 instead of any integral type.
11093 * Byte character, byte string, and raw byte string literals are now all
11094 supported by prefixing the normal literal with a `b`.
11095 * Multiple ABIs are no longer allowed in an ABI string
11096 * The syntax for lifetimes on closures/procedures has been tweaked
11097 slightly: `<'a>|A, B|: 'b + K -> T`
11098 * Floating point modulus has been removed from the language; however it
11099 is still provided by a library implementation.
11100 * Private enum variants are now disallowed.
11101 * The `priv` keyword has been removed from the language.
11102 * A closure can no longer be invoked through a &-pointer.
11103 * The `use foo, bar, baz;` syntax has been removed from the language.
11104 * The transmute intrinsic no longer works on type parameters.
11105 * Statics now allow blocks/items in their definition.
11106 * Trait bounds are separated from objects with + instead of : now.
11107 * Objects can no longer be read while they are mutably borrowed.
11108 * The address of a static is now marked as insignificant unless the
11109 #[inline(never)] attribute is placed it.
11110 * The #[unsafe_destructor] attribute is now behind a feature gate.
11111 * Struct literals are no longer allowed in ambiguous positions such as
11112 if, while, match, and for..in.
11113 * Declaration of lang items and intrinsics are now feature-gated by
11115 * Integral literals no longer default to `int`, and floating point
11116 literals no longer default to `f64`. Literals must be suffixed with an
11117 appropriate type if inference cannot determine the type of the
11119 * The Box<T> type is no longer implicitly borrowed to &mut T.
11120 * Procedures are now required to not capture borrowed references.
11123 * The standard library is now a "facade" over a number of underlying
11124 libraries. This means that development on the standard library should
11125 be speedier due to smaller crates, as well as a clearer line between
11127 * A new library, libcore, lives under the standard library's facade
11128 which is Rust's "0-assumption" library, suitable for embedded and
11129 kernel development for example.
11130 * A regex crate has been added to the standard distribution. This crate
11131 includes statically compiled regular expressions.
11132 * The unwrap/unwrap_err methods on Result require a Show bound for
11133 better error messages.
11134 * The return types of the std::comm primitives have been centralized
11135 around the Result type.
11136 * A number of I/O primitives have gained the ability to time out their
11138 * A number of I/O primitives have gained the ability to close their
11139 reading/writing halves to cancel pending operations.
11140 * Reverse iterator methods have been removed in favor of `rev()` on
11141 their forward-iteration counterparts.
11142 * A bitflags! macro has been added to enable easy interop with C and
11143 management of bit flags.
11144 * A debug_assert! macro is now provided which is disabled when
11145 `--cfg ndebug` is passed to the compiler.
11146 * A graphviz crate has been added for creating .dot files.
11147 * The std::cast module has been migrated into std::mem.
11148 * The std::local_data api has been migrated from freestanding functions
11149 to being based on methods.
11150 * The Pod trait has been renamed to Copy.
11151 * jemalloc has been added as the default allocator for types.
11152 * The API for allocating memory has been changed to use proper alignment
11153 and sized deallocation
11154 * Connecting a TcpStream or binding a TcpListener is now based on a
11155 string address and a u16 port. This allows connecting to a hostname as
11157 * The Reader trait now contains a core method, read_at_least(), which
11158 correctly handles many repeated 0-length reads.
11159 * The process-spawning API is now centered around a builder-style
11161 * The :? printing qualifier has been moved from the standard library to
11162 an external libdebug crate.
11163 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
11164 have been renamed to Eq/Ord.
11165 * The select/plural methods have been removed from format!. The escapes
11166 for { and } have also changed from \{ and \} to {{ and }},
11168 * The TaskBuilder API has been re-worked to be a true builder, and
11169 extension traits for spawning native/green tasks have been added.
11172 * All breaking changes to the language or libraries now have their
11173 commit message annotated with `[breaking-change]` to allow for easy
11174 discovery of breaking changes.
11175 * The compiler will now try to suggest how to annotate lifetimes if a
11176 lifetime-related error occurs.
11177 * Debug info continues to be improved greatly with general bug fixes and
11178 better support for situations like link time optimization (LTO).
11179 * Usage of syntax extensions when cross-compiling has been fixed.
11180 * Functionality equivalent to GCC & Clang's -ffunction-sections,
11181 -fdata-sections and --gc-sections has been enabled by default
11182 * The compiler is now stricter about where it will load module files
11183 from when a module is declared via `mod foo;`.
11184 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
11185 Syntax extensions are now discovered via a "plugin registrar" type
11186 which will be extended in the future to other various plugins.
11187 * Lints have been restructured to allow for dynamically loadable lints.
11188 * A number of rustdoc improvements:
11189 * The HTML output has been visually redesigned.
11190 * Markdown is now powered by hoedown instead of sundown.
11191 * Searching heuristics have been greatly improved.
11192 * The search index has been reduced in size by a great amount.
11193 * Cross-crate documentation via `pub use` has been greatly improved.
11194 * Primitive types are now hyperlinked and documented.
11195 * Documentation has been moved from static.rust-lang.org/doc to
11197 * A new sandbox, play.rust-lang.org, is available for running and
11198 sharing rust code examples on-line.
11199 * Unused attributes are now more robustly warned about.
11200 * The dead_code lint now warns about unused struct fields.
11201 * Cross-compiling to iOS is now supported.
11202 * Cross-compiling to mipsel is now supported.
11203 * Stability attributes are now inherited by default and no longer apply
11204 to intra-crate usage, only inter-crate usage.
11205 * Error message related to non-exhaustive match expressions have been
11209 Version 0.10 (2014-04-03)
11210 =========================
11212 * ~1500 changes, numerous bugfixes
11215 * A new RFC process is now in place for modifying the language.
11216 * Patterns with `@`-pointers have been removed from the language.
11217 * Patterns with unique vectors (`~[T]`) have been removed from the
11219 * Patterns with unique strings (`~str`) have been removed from the
11221 * `@str` has been removed from the language.
11222 * `@[T]` has been removed from the language.
11223 * `@self` has been removed from the language.
11224 * `@Trait` has been removed from the language.
11225 * Headers on `~` allocations which contain `@` boxes inside the type for
11226 reference counting have been removed.
11227 * The semantics around the lifetimes of temporary expressions have changed,
11228 see #3511 and #11585 for more information.
11229 * Cross-crate syntax extensions are now possible, but feature gated. See
11230 #11151 for more information. This includes both `macro_rules!` macros as
11231 well as syntax extensions such as `format!`.
11232 * New lint modes have been added, and older ones have been turned on to be
11234 * Unnecessary parentheses
11235 * Uppercase statics
11237 * Uppercase variables
11238 * Publicly visible private types
11239 * `#[deriving]` with raw pointers
11240 * Unsafe functions can no longer be coerced to closures.
11241 * Various obscure macros such as `log_syntax!` are now behind feature gates.
11242 * The `#[simd]` attribute is now behind a feature gate.
11243 * Visibility is no longer allowed on `extern crate` statements, and
11244 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
11245 * Trailing commas are now allowed in argument lists and tuple patterns.
11246 * The `do` keyword has been removed, it is now a reserved keyword.
11247 * Default type parameters have been implemented, but are feature gated.
11248 * Borrowed variables through captures in closures are now considered soundly.
11249 * `extern mod` is now `extern crate`
11250 * The `Freeze` trait has been removed.
11251 * The `Share` trait has been added for types that can be shared among
11253 * Labels in macros are now hygienic.
11254 * Expression/statement macro invocations can be delimited with `{}` now.
11255 * Treatment of types allowed in `static mut` locations has been tweaked.
11256 * The `*` and `.` operators are now overloadable through the `Deref` and
11258 * `~Trait` and `proc` no longer have `Send` bounds by default.
11259 * Partial type hints are now supported with the `_` type marker.
11260 * An `Unsafe` type was introduced for interior mutability. It is now
11261 considered undefined to transmute from `&T` to `&mut T` without using the
11263 * The #[linkage] attribute was implemented for extern statics/functions.
11264 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
11265 * `Pod` was renamed to `Copy`.
11268 * The `libextra` library has been removed. It has now been decomposed into
11269 component libraries with smaller and more focused nuggets of
11270 functionality. The full list of libraries can be found on the
11271 documentation index page.
11272 * std: `std::condition` has been removed. All I/O errors are now propagated
11273 through the `Result` type. In order to assist with error handling, a
11274 `try!` macro for unwrapping errors with an early return and a lint for
11275 unused results has been added. See #12039 for more information.
11276 * std: The `vec` module has been renamed to `slice`.
11277 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
11278 This will become the only growable vector in the future.
11279 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
11280 are now found at `std::io::BufferedReader` instead of
11281 `std::io::buffered::BufferedReader`.
11282 * std: `print` and `println` are no longer in the prelude, the `print!` and
11283 `println!` macros are intended to be used instead.
11284 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
11285 attempts to statically prevent cycles.
11286 * std: The standard distribution is adopting the policy of pushing failure
11287 to the user rather than failing in libraries. Many functions (such as
11288 `slice::last()`) now return `Option<T>` instead of `T` + failing.
11289 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
11290 deriving mode: `#[deriving(Show)]`.
11291 * std: `ToStr` is now implemented for all types implementing `Show`.
11292 * std: The formatting trait methods now take `&self` instead of `&T`
11293 * std: The `invert()` method on iterators has been renamed to `rev()`
11294 * std: `std::num` has seen a reduction in the genericity of its traits,
11295 consolidating functionality into a few core traits.
11296 * std: Backtraces are now printed on task failure if the environment
11297 variable `RUST_BACKTRACE` is present.
11298 * std: Naming conventions for iterators have been standardized. More details
11299 can be found on the wiki's style guide.
11300 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11301 still implement the function.
11302 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11303 * std: `assert_approx_eq!` has been removed
11304 * std: The `e` and `E` formatting specifiers for floats have been added to
11305 print them in exponential notation.
11306 * std: The `Times` trait has been removed
11307 * std: Indications of variance and opting out of builtin bounds is done
11308 through marker types in `std::kinds::marker` now
11309 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11310 `#[deriving(Hash)]` is now possible.
11311 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11312 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11313 * std: `Chan::new` is now `channel()`.
11314 * std: A new synchronous channel type has been implemented.
11315 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11316 * std: `hashmap` and `trie` have been moved to `libcollections`
11317 * std: `run` has been rolled into `io::process`
11318 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11319 * std: The equality and comparison traits have seen some reorganization.
11320 * std: `rand` has moved to `librand`.
11321 * std: `to_{lower,upper}case` has been implemented for `char`.
11322 * std: Logging has been moved to `liblog`.
11323 * collections: `HashMap` has been rewritten for higher performance and less
11325 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11326 it can be booted manually. The runtime guide has more information and
11328 * native: All I/O functionality except signals has been implemented.
11329 * green: Task spawning with `libgreen` has been optimized with stack caching
11330 and various trimming of code.
11331 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11332 * sync: The `extra::sync` module has been updated to modern rust (and moved
11333 to the `sync` library), tweaking and improving various interfaces while
11334 dropping redundant functionality.
11335 * sync: A new `Barrier` type has been added to the `sync` library.
11336 * sync: An efficient mutex for native and green tasks has been implemented.
11337 * serialize: The `base64` module has seen some improvement. It treats
11338 newlines better, has non-string error values, and has seen general
11340 * fourcc: A `fourcc!` macro was introduced
11341 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11342 hexadecimal literal.
11345 * `rustpkg` has been deprecated and removed from the main repository. Its
11346 replacement, `cargo`, is under development.
11347 * Nightly builds of rust are now available
11348 * The memory usage of rustc has been improved many times throughout this
11350 * The build process supports disabling rpath support for the rustc binary
11352 * Code generation has improved in some cases, giving more information to the
11353 LLVM optimization passes to enable more extensive optimizations.
11354 * Debuginfo compatibility with lldb on OSX has been restored.
11355 * The master branch is now gated on an android bot, making building for
11356 android much more reliable.
11357 * Output flags have been centralized into one `--emit` flag.
11358 * Crate type flags have been centralized into one `--crate-type` flag.
11359 * Codegen flags have been consolidated behind a `-C` flag.
11360 * Linking against outdated crates now has improved error messages.
11361 * Error messages with lifetimes will often suggest how to annotate the
11362 function to fix the error.
11363 * Many more types are documented in the standard library, and new guides
11365 * Many `rustdoc` improvements:
11366 * code blocks are syntax highlighted.
11367 * render standalone markdown files.
11368 * the --test flag tests all code blocks by default.
11369 * exported macros are displayed.
11370 * re-exported types have their documentation inlined at the location of the
11372 * search works across crates that have been rendered to the same output
11376 Version 0.9 (2014-01-09)
11377 ==========================
11379 * ~1800 changes, numerous bugfixes
11382 * The `float` type has been removed. Use `f32` or `f64` instead.
11383 * A new facility for enabling experimental features (feature gating) has
11384 been added, using the crate-level `#[feature(foo)]` attribute.
11385 * Managed boxes (@) are now behind a feature gate
11386 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11387 standard library's `Gc` or `Rc` types instead.
11388 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11389 * Jumping back to the top of a loop is now done with `continue` instead of
11391 * Strings can no longer be mutated through index assignment.
11392 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11393 hash delimiters, as in `r###"foo"###`.
11394 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11396 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11397 * `@fn`s have been removed.
11398 * `do` only works with procs in order to make it obvious what the cost
11400 * Single-element tuple-like structs can no longer be dereferenced to
11401 obtain the inner value. A more comprehensive solution for overloading
11402 the dereference operator will be provided in the future.
11403 * The `#[link(...)]` attribute has been replaced with
11404 `#[crate_id = "name#vers"]`.
11405 * Empty `impl`s must be terminated with empty braces and may not be
11406 terminated with a semicolon.
11407 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11408 no longer has any special meaning.
11409 * The old `fmt!` string formatting macro has been removed.
11410 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11411 `print!` and `println!`.
11412 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11413 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11414 `extern mod foo = "bar"` instead.
11415 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11416 * Macros can have attributes.
11417 * Macros can expand to items with attributes.
11418 * Macros can expand to multiple items.
11419 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11420 * Comments may be nested.
11421 * Values automatically coerce to trait objects they implement, without
11423 * Enum discriminants are no longer an entire word but as small as needed to
11424 contain all the variants. The `repr` attribute can be used to override
11425 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11426 `#[repr(C)]` to match C enums.
11427 * Non-string literals are not allowed in attributes (they never worked).
11428 * The FFI now supports variadic functions.
11429 * Octal numeric literals, as in `0o7777`.
11430 * The `concat!` syntax extension performs compile-time string concatenation.
11431 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11432 removed as Rust no longer uses segmented stacks.
11433 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11434 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11435 not `*`; ignoring remaining fields of a struct is also done with `..`,
11436 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11437 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11438 * `rustc` supports the "system" calling convention, which defaults to the
11439 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11441 * The `type_overflow` lint (default: warn) checks literals for overflow.
11442 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11443 * The `attribute_usage` lint (default: warn) warns about unknown
11445 * The `unknown_features` lint (default: warn) warns about unknown
11447 * The `dead_code` lint (default: warn) checks for dead code.
11448 * Rust libraries can be linked statically to one another
11449 * `#[link_args]` is behind the `link_args` feature gate.
11450 * Native libraries are now linked with `#[link(name = "foo")]`
11451 * Native libraries can be statically linked to a rust crate
11452 (`#[link(name = "foo", kind = "static")]`).
11453 * Native OS X frameworks are now officially supported
11454 (`#[link(name = "foo", kind = "framework")]`).
11455 * The `#[thread_local]` attribute creates thread-local (not task-local)
11456 variables. Currently behind the `thread_local` feature gate.
11457 * The `return` keyword may be used in closures.
11458 * Types that can be copied via a memcpy implement the `Pod` kind.
11459 * The `cfg` attribute can now be used on struct fields and enum variants.
11462 * std: The `option` and `result` API's have been overhauled to make them
11463 simpler, more consistent, and more composable.
11464 * std: The entire `std::io` module has been replaced with one that is
11465 more comprehensive and that properly interfaces with the underlying
11466 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11468 * std: `io::util` contains a number of useful implementations of
11469 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11470 `ZeroReader`, `TeeReader`.
11471 * std: The reference counted pointer type `extra::rc` moved into std.
11472 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11473 just a wrapper around it).
11474 * std: The `Either` type has been removed.
11475 * std: `fmt::Default` can be implemented for any type to provide default
11476 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11477 * std: The `rand` API continues to be tweaked.
11478 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11479 on failure in gdb, is now named `rust_fail`.
11480 * std: The `each_key` and `each_value` methods on `HashMap` have been
11481 replaced by the `keys` and `values` iterators.
11482 * std: Functions dealing with type size and alignment have moved from the
11483 `sys` module to the `mem` module.
11484 * std: The `path` module was written and API changed.
11485 * std: `str::from_utf8` has been changed to cast instead of allocate.
11486 * std: `starts_with` and `ends_with` methods added to vectors via the
11487 `ImmutableEqVector` trait, which is in the prelude.
11488 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11489 if the index is out of bounds.
11490 * std: Task failure no longer propagates between tasks, as the model was
11491 complex, expensive, and incompatible with thread-based tasks.
11492 * std: The `Any` type can be used for dynamic typing.
11493 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11495 * std: Methods that produce iterators generally do not have an `_iter`
11497 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11498 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11499 * std: `util::ignore` renamed to `prelude::drop`.
11500 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11502 * std: `vec::raw` has seen a lot of cleanup and API changes.
11503 * std: The standard library no longer includes any C++ code, and very
11504 minimal C, eliminating the dependency on libstdc++.
11505 * std: Runtime scheduling and I/O functionality has been factored out into
11506 extensible interfaces and is now implemented by two different crates:
11507 libnative, for native threading and I/O; and libgreen, for green threading
11508 and I/O. This paves the way for using the standard library in more limited
11509 embedded environments.
11510 * std: The `comm` module has been rewritten to be much faster, have a
11511 simpler, more consistent API, and to work for both native and green
11513 * std: All libuv dependencies have been moved into the rustuv crate.
11514 * native: New implementations of runtime scheduling on top of OS threads.
11515 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11517 * green: The green thread scheduler and message passing types are almost
11518 entirely lock-free.
11519 * extra: The `flatpipes` module had bitrotted and was removed.
11520 * extra: All crypto functions have been removed and Rust now has a policy of
11521 not reimplementing crypto in the standard library. In the future crypto
11522 will be provided by external crates with bindings to established libraries.
11523 * extra: `c_vec` has been modernized.
11524 * extra: The `sort` module has been removed. Use the `sort` method on
11528 * The `rust` and `rusti` commands have been removed, due to lack of
11530 * `rustdoc` was completely rewritten.
11531 * `rustdoc` can test code examples in documentation.
11532 * `rustpkg` can test packages with the argument, 'test'.
11533 * `rustpkg` supports arbitrary dependencies, including C libraries.
11534 * `rustc`'s support for generating debug info is improved again.
11535 * `rustc` has better error reporting for unbalanced delimiters.
11536 * `rustc`'s JIT support was removed due to bitrot.
11537 * Executables and static libraries can be built with LTO (-Z lto)
11538 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11542 Version 0.8 (2013-09-26)
11543 ============================
11545 * ~2200 changes, numerous bugfixes
11548 * The `for` loop syntax has changed to work with the `Iterator` trait.
11549 * At long last, unwinding works on Windows.
11550 * Default methods are ready for use.
11551 * Many trait inheritance bugs fixed.
11552 * Owned and borrowed trait objects work more reliably.
11553 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11554 * rustc can omit emission of code for the `debug!` macro if it is passed
11556 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11557 for foo.rs, then foo/mod.rs, and will generate an error when both are
11559 * Strings no longer contain trailing nulls. The new `std::c_str` module
11560 provides new mechanisms for converting to C strings.
11561 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11562 * The FFI has been overhauled such that foreign functions are called directly,
11563 instead of through a stack-switching wrapper.
11564 * Calling a foreign function must be done through a Rust function with the
11565 `#[fixed_stack_segment]` attribute.
11566 * The `externfn!` macro can be used to declare both a foreign function and
11567 a `#[fixed_stack_segment]` wrapper at once.
11568 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11569 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11570 * `priv` is disallowed everywhere except for struct fields and enum variants.
11571 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11572 * `ref` bindings in irrefutable patterns work correctly now.
11573 * `char` is now prevented from containing invalid code points.
11574 * Casting to `bool` is no longer allowed.
11575 * `\0` is now accepted as an escape in chars and strings.
11576 * `yield` is a reserved keyword.
11577 * `typeof` is a reserved keyword.
11578 * Crates may be imported by URL with `extern mod foo = "url";`.
11579 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11580 * Static vectors can be initialized with repeating elements,
11581 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11582 * Static structs can be initialized with functional record update,
11583 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11584 * `cfg!` can be used to conditionally execute code based on the crate
11585 configuration, similarly to `#[cfg(...)]`.
11586 * The `unnecessary_qualification` lint detects unneeded module
11587 prefixes (default: allow).
11588 * Arithmetic operations have been implemented on the SIMD types in
11589 `std::unstable::simd`.
11590 * Exchange allocation headers were removed, reducing memory usage.
11591 * `format!` implements a completely new, extensible, and higher-performance
11592 string formatting system. It will replace `fmt!`.
11593 * `print!` and `println!` write formatted strings (using the `format!`
11594 extension) to stdout.
11595 * `write!` and `writeln!` write formatted strings (using the `format!`
11596 extension) to the new Writers in `std::rt::io`.
11597 * The library section in which a function or static is placed may
11598 be specified with `#[link_section = "..."]`.
11599 * The `proto!` syntax extension for defining bounded message protocols
11601 * `macro_rules!` is hygienic for `let` declarations.
11602 * The `#[export_name]` attribute specifies the name of a symbol.
11603 * `unreachable!` can be used to indicate unreachable code, and fails
11607 * std: Transitioned to the new runtime, written in Rust.
11608 * std: Added an experimental I/O library, `rt::io`, based on the new
11610 * std: A new generic `range` function was added to the prelude, replacing
11611 `uint::range` and friends.
11612 * std: `range_rev` no longer exists. Since range is an iterator it can be
11613 reversed with `range(lo, hi).invert()`.
11614 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11615 renamed to `unwrap_or`.
11616 * std: The `iterator` module was renamed to `iter`.
11617 * std: Integral types now support the `checked_add`, `checked_sub`, and
11618 `checked_mul` operations for detecting overflow.
11619 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11621 * std: Methods are standardizing on conventions for casting methods:
11622 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11624 * std: The `CString` type in `c_str` provides new ways to convert to and
11626 * std: `DoubleEndedIterator` can yield elements in two directions.
11627 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11629 * std: `str::from_bytes` renamed to `str::from_utf8`.
11630 * std: `pop_opt` and `shift_opt` methods added to vectors.
11631 * std: The task-local data interface no longer uses @, and keys are
11632 no longer function pointers.
11633 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11634 * std: Added `SharedPort` to `comm`.
11635 * std: `Eq` has a default method for `ne`; only `eq` is required
11636 in implementations.
11637 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11638 is required in implementations.
11639 * std: `is_utf8` performance is improved, impacting many string functions.
11640 * std: `os::MemoryMap` provides cross-platform mmap.
11641 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11642 are not 'in-bounds' are considered undefined.
11643 * std: Many freestanding functions in `vec` removed in favor of methods.
11644 * std: Many freestanding functions on scalar types removed in favor of
11646 * std: Many options to task builders were removed since they don't make
11647 sense in the new scheduler design.
11648 * std: More containers implement `FromIterator` so can be created by the
11650 * std: More complete atomic types in `unstable::atomics`.
11651 * std: `comm::PortSet` removed.
11652 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11653 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11654 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11655 default implementations.
11656 * std: Various `from_str` functions were removed in favor of a generic
11657 `from_str` which is available in the prelude.
11658 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11659 * extra: `dlist`, the doubly-linked list was modernized.
11660 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11661 * extra: Added `glob` module, replacing `std::os::glob`.
11662 * extra: `rope` was removed.
11663 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11664 * extra: `net`, and `timer` were removed. The experimental replacements
11665 are `std::rt::io::net` and `std::rt::io::timer`.
11666 * extra: Iterators implemented for `SmallIntMap`.
11667 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11668 * extra: `SmallIntSet` removed. Use `BitvSet`.
11669 * extra: Performance of JSON parsing greatly improved.
11670 * extra: `semver` updated to SemVer 2.0.0.
11671 * extra: `term` handles more terminals correctly.
11672 * extra: `dbg` module removed.
11673 * extra: `par` module removed.
11674 * extra: `future` was cleaned up, with some method renames.
11675 * extra: Most free functions in `getopts` were converted to methods.
11678 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11679 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11680 similarly to gcc's `--march` flag.
11681 * rustc's performance compiling small crates is much better.
11682 * rustpkg has received many improvements.
11683 * rustpkg supports git tags as package IDs.
11684 * rustpkg builds into target-specific directories so it can be used for
11686 * The number of concurrent test tasks is controlled by the environment
11687 variable RUST_TEST_TASKS.
11688 * The test harness can now report metrics for benchmarks.
11689 * All tools have man pages.
11690 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11691 * The runtime uses jemalloc for allocations.
11692 * Segmented stacks are temporarily disabled as part of the transition to
11693 the new runtime. Stack overflows are possible!
11694 * A new documentation backend, rustdoc_ng, is available for use. It is
11695 still invoked through the normal `rustdoc` command.
11698 Version 0.7 (2013-07-03)
11699 =======================
11701 * ~2000 changes, numerous bugfixes
11704 * `impl`s no longer accept a visibility qualifier. Put them on methods
11706 * The borrow checker has been rewritten with flow-sensitivity, fixing
11707 many bugs and inconveniences.
11708 * The `self` parameter no longer implicitly means `&'self self`,
11709 and can be explicitly marked with a lifetime.
11710 * Overloadable compound operators (`+=`, etc.) have been temporarily
11711 removed due to bugs.
11712 * The `for` loop protocol now requires `for`-iterators to return `bool`
11713 so they compose better.
11714 * The `Durable` trait is replaced with the `'static` bounds.
11715 * Trait default methods work more often.
11716 * Structs with the `#[packed]` attribute have byte alignment and
11717 no padding between fields.
11718 * Type parameters bound by `Copy` must now be copied explicitly with
11719 the `copy` keyword.
11720 * It is now illegal to move out of a dereferenced unsafe pointer.
11721 * `Option<~T>` is now represented as a nullable pointer.
11722 * `@mut` does dynamic borrow checks correctly.
11723 * The `main` function is only detected at the topmost level of the crate.
11724 The `#[main]` attribute is still valid anywhere.
11725 * Struct fields may no longer be mutable. Use inherited mutability.
11726 * The `#[no_send]` attribute makes a type that would otherwise be
11728 * The `#[no_freeze]` attribute makes a type that would otherwise be
11730 * Unbounded recursion will abort the process after reaching the limit
11731 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11732 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11733 are never implicitly copyable.
11734 * `#[static_assert]` makes compile-time assertions about static bools.
11735 * At long last, 'argument modes' no longer exist.
11736 * The rarely used `use mod` statement no longer exists.
11738 * Syntax extensions
11739 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11741 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11742 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11743 `#[deriving(...)]`.
11744 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11745 and unsuffixed integer literals.
11748 * The `core` crate was renamed to `std`.
11749 * The `std` crate was renamed to `extra`.
11750 * More and improved documentation.
11751 * std: `iterator` module for external iterator objects.
11752 * Many old-style (internal, higher-order function) iterators replaced by
11753 implementations of `Iterator`.
11754 * std: Many old internal vector and string iterators,
11755 incl. `any`, `all`. removed.
11756 * std: The `finalize` method of `Drop` renamed to `drop`.
11757 * std: The `drop` method now takes `&mut self` instead of `&self`.
11758 * std: The prelude no longer re-exports any modules, only types and traits.
11759 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11760 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11761 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11762 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11763 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11764 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11765 * std: Many types implement `Clone`.
11766 * std: `path` type renamed to `Path`.
11767 * std: `mut` module and `Mut` type removed.
11768 * std: Many standalone functions removed in favor of methods and iterators
11769 in `vec`, `str`. In the future methods will also work as functions.
11770 * std: `reinterpret_cast` removed. Use `transmute`.
11771 * std: ascii string handling in `std::ascii`.
11772 * std: `Rand` is implemented for ~/@.
11773 * std: `run` module for spawning processes overhauled.
11774 * std: Various atomic types added to `unstable::atomic`.
11775 * std: Various types implement `Zero`.
11776 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11777 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11778 * std: Added `os::mkdir_recursive`.
11779 * std: Added `os::glob` function performs filesystems globs.
11780 * std: `FuzzyEq` renamed to `ApproxEq`.
11781 * std: `Map` now defines `pop` and `swap` methods.
11782 * std: `Cell` constructors converted to static methods.
11783 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11784 * extra: `flate` module moved from `std` to `extra`.
11785 * extra: `fileinput` module for iterating over a series of files.
11786 * extra: `Complex` number type and `complex` module.
11787 * extra: `Rational` number type and `rational` module.
11788 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11789 * extra: `term` uses terminfo now, is more correct.
11790 * extra: `arc` functions converted to methods.
11791 * extra: Implementation of fixed output size variations of SHA-2.
11794 * `unused_variables` lint mode for unused variables (default: warn).
11795 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11797 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11799 * `dead_assignment` lint mode for unread variables (default: warn).
11800 * `unnecessary_allocation` lint mode detects some heap allocations that are
11801 immediately borrowed so could be written without allocating (default: warn).
11802 * `missing_doc` lint mode (default: allow).
11803 * `unreachable_code` lint mode (default: warn).
11804 * The `rusti` command has been rewritten and a number of bugs addressed.
11805 * rustc outputs in color on more terminals.
11806 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11807 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11808 * Compiling with `-g` will make the binary record information about
11809 dynamic borrowcheck failures for debugging.
11810 * rustdoc has a nicer stylesheet.
11811 * Various improvements to rustdoc.
11812 * Improvements to rustpkg (see the detailed release notes).
11815 Version 0.6 (2013-04-03)
11816 ========================
11818 * ~2100 changes, numerous bugfixes
11821 * The self type parameter in traits is now spelled `Self`
11822 * The `self` parameter in trait and impl methods must now be explicitly
11823 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11824 * Static methods no longer require the `static` keyword and instead
11825 are distinguished by the lack of a `self` parameter
11826 * Replaced the `Durable` trait with the `'static` lifetime
11827 * The old closure type syntax with the trailing sigil has been
11828 removed in favor of the more consistent leading sigil
11829 * `super` is a keyword, and may be prefixed to paths
11830 * Trait bounds are separated with `+` instead of whitespace
11831 * Traits are implemented with `impl Trait for Type`
11832 instead of `impl Type: Trait`
11833 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11834 * The `export` keyword has finally been removed
11835 * The `move` keyword has been removed (see "Semantic changes")
11836 * The interior mutability qualifier on vectors, `[mut T]`, has been
11837 removed. Use `&mut [T]`, etc.
11838 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11839 * `fail` is no longer a keyword. Use `fail!()`
11840 * `assert` is no longer a keyword. Use `assert!()`
11841 * `log` is no longer a keyword. use `debug!`, etc.
11842 * 1-tuples may be represented as `(T,)`
11843 * Struct fields may no longer be `mut`. Use inherited mutability,
11844 `@mut T`, `core::mut` or `core::cell`
11845 * `extern mod { ... }` is no longer valid syntax for foreign
11846 function modules. Use extern blocks: `extern { ... }`
11847 * Newtype enums removed. Use tuple-structs.
11848 * Trait implementations no longer support visibility modifiers
11849 * Pattern matching over vectors improved and expanded
11850 * `const` renamed to `static` to correspond to lifetime name,
11851 and make room for future `static mut` unsafe mutable globals.
11852 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11853 * `Clone` implementations can be automatically generated with
11854 `#[deriving(Clone)]`
11855 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11856 instead of `foo as Bar`.
11857 * Fixed length vector types are now written as `[int, .. 3]`
11858 instead of `[int * 3]`.
11859 * Fixed length vector types can express the length as a constant
11860 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11863 * Types with owned pointers or custom destructors move by default,
11864 eliminating the `move` keyword
11865 * All foreign functions are considered unsafe
11866 * &mut is now unaliasable
11867 * Writes to borrowed @mut pointers are prevented dynamically
11869 * The name of the main function can be customized using #[main]
11870 * The default type of an inferred closure is &fn instead of @fn
11871 * `use` statements may no longer be "chained" - they cannot import
11872 identifiers imported by previous `use` statements
11873 * `use` statements are crate relative, importing from the "top"
11874 of the crate by default. Paths may be prefixed with `super::`
11875 or `self::` to change the search behavior.
11876 * Method visibility is inherited from the implementation declaration
11877 * Structural records have been removed
11878 * Many more types can be used in static items, including enums
11879 'static-lifetime pointers and vectors
11880 * Pattern matching over vectors improved and expanded
11881 * Typechecking of closure types has been overhauled to
11882 improve inference and eliminate unsoundness
11883 * Macros leave scope at the end of modules, unless that module is
11884 tagged with #[macro_escape]
11887 * Added big integers to `std::bigint`
11888 * Removed `core::oldcomm` module
11889 * Added pipe-based `core::comm` module
11890 * Numeric traits have been reorganized under `core::num`
11891 * `vec::slice` finally returns a slice
11892 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11893 * Containers reorganized around traits in `core::container`
11894 * `core::dvec` removed, `~[T]` is a drop-in replacement
11895 * `core::send_map` renamed to `core::hashmap`
11896 * `std::map` removed; replaced with `core::hashmap`
11897 * `std::treemap` reimplemented as an owned balanced tree
11898 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11899 * `core::trie` added as a fast ordered map for integer keys
11900 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11901 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11902 overload the comparison operators, whereas `TotalOrd` is used
11903 by certain container types
11906 * Replaced the 'cargo' package manager with 'rustpkg'
11907 * Added all-purpose 'rust' tool
11908 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11909 * rustc now *attempts* to offer spelling suggestions
11910 * Improved support for ARM and Android
11911 * Preliminary MIPS backend
11912 * Improved foreign function ABI implementation for x86, x86_64
11913 * Various memory usage improvements
11914 * Rust code may be embedded in foreign code under limited circumstances
11915 * Inline assembler supported by new asm!() syntax extension.
11918 Version 0.5 (2012-12-21)
11919 ===========================
11921 * ~900 changes, numerous bugfixes
11924 * Removed `<-` move operator
11925 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11926 * Removed old fixed length vector syntax - `[T]/N`
11927 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11928 * Macros may now expand to items and statements
11929 * `a.b()` is always parsed as a method call, never as a field projection
11930 * `Eq` and `IterBytes` implementations can be automatically generated
11931 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11932 * Removed the special crate language for `.rc` files
11933 * Function arguments may consist of any irrefutable pattern
11936 * `&` and `~` pointers may point to objects
11937 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11938 * Enum variants may be structs
11939 * Destructors can be added to all nominal types with the Drop trait
11940 * Structs and nullary enum variants may be constants
11941 * Values that cannot be implicitly copied are now automatically moved
11942 without writing `move` explicitly
11943 * `&T` may now be coerced to `*T`
11944 * Coercions happen in `let` statements as well as function calls
11945 * `use` statements now take crate-relative paths
11946 * The module and type namespaces have been merged so that static
11947 method names can be resolved under the trait in which they are
11950 * Improved support for language features
11951 * Trait inheritance works in many scenarios
11952 * More support for explicit self arguments in methods - `self`, `&self`
11953 `@self`, and `~self` all generally work as expected
11954 * Static methods work in more situations
11955 * Experimental: Traits may declare default methods for the implementations
11959 * New condition handling system in `core::condition`
11960 * Timsort added to `std::sort`
11961 * New priority queue, `std::priority_queue`
11962 * Pipes for serializable types, `std::flatpipes'
11963 * Serialization overhauled to be trait-based
11964 * Expanded `getopts` definitions
11965 * Moved futures to `std`
11966 * More functions are pure now
11967 * `core::comm` renamed to `oldcomm`. Still deprecated
11968 * `rustdoc` and `cargo` are libraries now
11971 * Added a preliminary REPL, `rusti`
11972 * License changed from MIT to dual MIT/APL2
11975 Version 0.4 (2012-10-15)
11976 ==========================
11978 * ~2000 changes, numerous bugfixes
11981 * All keywords are now strict and may not be used as identifiers anywhere
11982 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11983 'of', 'with', 'to', 'class'.
11984 * Classes are replaced with simpler structs
11985 * Explicit method self types
11986 * `ret` became `return` and `alt` became `match`
11987 * `import` is now `use`; `use is now `extern mod`
11988 * `extern mod { ... }` is now `extern { ... }`
11989 * `use mod` is the recommended way to import modules
11990 * `pub` and `priv` replace deprecated export lists
11991 * The syntax of `match` pattern arms now uses fat arrow (=>)
11992 * `main` no longer accepts an args vector; use `os::args` instead
11995 * Trait implementations are now coherent, ala Haskell typeclasses
11996 * Trait methods may be static
11997 * Argument modes are deprecated
11998 * Borrowed pointers are much more mature and recommended for use
11999 * Strings and vectors in the static region are stored in constant memory
12000 * Typestate was removed
12001 * Resolution rewritten to be more reliable
12002 * Support for 'dual-mode' data structures (freezing and thawing)
12005 * Most binary operators can now be overloaded via the traits in
12007 * `std::net::url` for representing URLs
12008 * Sendable hash maps in `core::send_map`
12009 * `core::task' gained a (currently unsafe) task-local storage API
12012 * An efficient new intertask communication primitive called the pipe,
12013 along with a number of higher-level channel types, in `core::pipes`
12014 * `std::arc`, an atomically reference counted, immutable, shared memory
12016 * `std::sync`, various exotic synchronization tools based on arcs and pipes
12017 * Futures are now based on pipes and sendable
12018 * More robust linked task failure
12019 * Improved task builder API
12022 * Improved error reporting
12023 * Preliminary JIT support
12024 * Preliminary work on precise GC
12025 * Extensive architectural improvements to rustc
12026 * Begun a transition away from buggy C++-based reflection (shape) code to
12027 Rust-based (visitor) code
12028 * All hash functions and tables converted to secure, randomized SipHash
12031 Version 0.3 (2012-07-12)
12032 ========================
12034 * ~1900 changes, numerous bugfixes
12036 * New coding conveniences
12037 * Integer-literal suffix inference
12038 * Per-item control over warnings, errors
12039 * #[cfg(windows)] and #[cfg(unix)] attributes
12040 * Documentation comments
12041 * More compact closure syntax
12042 * 'do' expressions for treating higher-order functions as
12044 * *-patterns (wildcard extended to all constructor fields)
12047 * Name resolution pass and exhaustiveness checker rewritten
12048 * Region pointers and borrow checking supersede alias
12050 * Init-ness checking is now provided by a region-based liveness
12051 pass instead of the typestate pass; same for last-use analysis
12052 * Extensive work on region pointers
12054 * Experimental new language features
12055 * Slices and fixed-size, interior-allocated vectors
12056 * #!-comments for lang versioning, shell execution
12057 * Destructors and iface implementation for classes;
12058 type-parameterized classes and class methods
12059 * 'const' type kind for types that can be used to implement
12060 shared-memory concurrency patterns
12064 * Removal of various obsolete features
12065 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
12066 'crust', 'native' (now 'extern'), 'cont' (now 'again')
12068 * Constructs: do-while loops ('do' repurposed), fn binding,
12069 resources (replaced by destructors)
12071 * Compiler reorganization
12072 * Syntax-layer of compiler split into separate crate
12073 * Clang (from LLVM project) integrated into build
12074 * Typechecker split into sub-modules
12077 * New time functions
12078 * Extension methods for many built-in types
12079 * Arc: atomic-refcount read-only / exclusive-use shared cells
12080 * Par: parallel map and search routines
12081 * Extensive work on libuv interface
12082 * Much vector code moved to libraries
12083 * Syntax extensions: #line, #col, #file, #mod, #stringify,
12084 #include, #include_str, #include_bin
12086 * Tool improvements
12087 * Cargo automatically resolves dependencies
12090 Version 0.2 (2012-03-29)
12091 =========================
12093 * >1500 changes, numerous bugfixes
12095 * New docs and doc tooling
12097 * New port: FreeBSD x86_64
12099 * Compilation model enhancements
12100 * Generics now specialized, multiply instantiated
12101 * Functions now inlined across separate crates
12103 * Scheduling, stack and threading fixes
12104 * Noticeably improved message-passing performance
12105 * Explicit schedulers
12109 * Experimental new language features
12110 * Operator overloading
12114 * Various language extensions
12115 * C-callback function types: 'crust fn ...'
12116 * Infinite-loop construct: 'loop { ... }'
12117 * Shorten 'mutable' to 'mut'
12118 * Required mutable-local qualifier: 'let mut ...'
12119 * Basic glob-exporting: 'export foo::*;'
12120 * Alt now exhaustive, 'alt check' for runtime-checked
12121 * Block-function form of 'for' loop, with 'break' and 'ret'.
12124 * AST quasi-quote syntax extension
12125 * Revived libuv interface
12126 * New modules: core::{future, iter}, std::arena
12127 * Merged per-platform std::{os*, fs*} to core::{libc, os}
12128 * Extensive cleanup, regularization in libstd, libcore
12131 Version 0.1 (2012-01-20)
12132 ===============================
12134 * Most language features work, including:
12135 * Unique pointers, unique closures, move semantics
12136 * Interface-constrained generics
12137 * Static interface dispatch
12139 * Multithread task scheduling
12140 * Typestate predicates
12141 * Failure unwinding, destructors
12142 * Pattern matching and destructuring assignment
12143 * Lightweight block-lambda syntax
12144 * Preliminary macro-by-example
12146 * Compiler works with the following configurations:
12147 * Linux: x86 and x86_64 hosts and targets
12148 * macOS: x86 and x86_64 hosts and targets
12149 * Windows: x86 hosts and targets
12151 * Cross compilation / multi-target configuration supported.
12153 * Preliminary API-documentation and package-management tools included.
12157 * Documentation is incomplete.
12159 * Performance is below intended target.
12161 * Standard library APIs are subject to extensive change, reorganization.
12163 * Language-level versioning is not yet operational - future code will
12164 break unexpectedly.