1 Version 1.66.1 (2023-01-10)
2 ===========================
4 - Added validation of SSH host keys for git URLs in Cargo ([CVE-2022-46176](https://www.cve.org/CVERecord?id=CVE-2022-46176))
6 Version 1.66.0 (2022-12-15)
7 ==========================
11 - [Permit specifying explicit discriminants on all `repr(Int)` enums](https://github.com/rust-lang/rust/pull/95710/)
20 - [Allow transmutes between the same type differing only in lifetimes](https://github.com/rust-lang/rust/pull/101520/)
21 - [Change constant evaluation errors from a deny-by-default lint to a hard error](https://github.com/rust-lang/rust/pull/102091/)
22 - [Trigger `must_use` on `impl Trait` for supertraits](https://github.com/rust-lang/rust/pull/102287/)
23 This makes `impl ExactSizeIterator` respect the existing `#[must_use]` annotation on `Iterator`.
24 - [Allow `..=X` in patterns](https://github.com/rust-lang/rust/pull/102275/)
25 - [Uplift `clippy::for_loops_over_fallibles` lint into rustc](https://github.com/rust-lang/rust/pull/99696/)
26 - [Stabilize `sym` operands in inline assembly](https://github.com/rust-lang/rust/pull/103168/)
27 - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101912/)
28 - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
29 This is a soundness fix which may break code that was erroneously relying on this behavior.
33 - [Add armv5te-none-eabi and thumbv5te-none-eabi tier 3 targets](https://github.com/rust-lang/rust/pull/101329/)
34 - Refer to Rust's [platform support page][platform-support-doc] for more
35 information on Rust's tiered platform support.
36 - [Add support for linking against macOS universal libraries](https://github.com/rust-lang/rust/pull/98736)
40 - [Fix `#[derive(Default)]` on a generic `#[default]` enum adding unnecessary `Default` bounds](https://github.com/rust-lang/rust/pull/101040/)
41 - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101821/)
46 - [`proc_macro::Span::source_text`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.source_text)
47 - [`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)
48 - [`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)
49 - [`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)
50 - [`BTreeSet::{first, last, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.first)
51 - [`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)
52 - [Add `AsFd` implementations for stdio lock types on WASI.](https://github.com/rust-lang/rust/pull/101768/)
53 - [`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)
54 - [`core::hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
55 - [`Duration::try_from_secs_{f32,f64}`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.try_from_secs_f32)
56 - [`Option::unzip`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unzip)
57 - [`std::os::fd`](https://doc.rust-lang.org/stable/std/os/fd/index.html)
63 - [Add Rustdoc warning for invalid HTML tags in the documentation](https://github.com/rust-lang/rust/pull/101720/)
68 - [Added `cargo remove` to remove dependencies from Cargo.toml](https://doc.rust-lang.org/nightly/cargo/commands/cargo-remove.html)
69 - [`cargo publish` now waits for the new version to be downloadable before exiting](https://github.com/rust-lang/cargo/pull/11062)
71 See [detailed release notes](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-166-2022-12-15) for more.
76 - [Only apply `ProceduralMasquerade` hack to older versions of `rental`](https://github.com/rust-lang/rust/pull/94063/)
77 - [Don't export `__heap_base` and `__data_end` on wasm32-wasi.](https://github.com/rust-lang/rust/pull/102385/)
78 - [Don't export `__wasm_init_memory` on WebAssembly.](https://github.com/rust-lang/rust/pull/102426/)
79 - [Only export `__tls_*` on wasm32-unknown-unknown.](https://github.com/rust-lang/rust/pull/102440/)
80 - [Don't link to `libresolv` in libstd on Darwin](https://github.com/rust-lang/rust/pull/102766/)
81 - [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/)
82 - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
83 This is a soundness fix which may break code that was erroneously relying on this behavior.
84 - [Make `order_dependent_trait_objects` show up in future-breakage reports](https://github.com/rust-lang/rust/pull/102635/)
85 - [Change std::process::Command spawning to default to inheriting the parent's signal mask](https://github.com/rust-lang/rust/pull/101077/)
90 These changes do not affect any public interfaces of Rust, but they represent
91 significant improvements to the performance or internals of rustc and related
94 - [Enable BOLT for LLVM compilation](https://github.com/rust-lang/rust/pull/94381/)
95 - [Enable LTO for rustc_driver.so](https://github.com/rust-lang/rust/pull/101403/)
97 Version 1.65.0 (2022-11-03)
98 ==========================
102 - [Error on `as` casts of enums with `#[non_exhaustive]` variants](https://github.com/rust-lang/rust/pull/92744/)
103 - [Stabilize `let else`](https://github.com/rust-lang/rust/pull/93628/)
104 - [Stabilize generic associated types (GATs)](https://github.com/rust-lang/rust/pull/96709/)
105 - [Add lints `let_underscore_drop` and `let_underscore_lock` from Clippy](https://github.com/rust-lang/rust/pull/97739/)
106 - [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")](https://github.com/rust-lang/rust/pull/99332/)
107 - [Uninitialized integers, floats, and raw pointers are now considered immediate UB](https://github.com/rust-lang/rust/pull/98919/).
108 Usage of `MaybeUninit` is the correct way to work with uninitialized memory.
109 - [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a](https://github.com/rust-lang/rust/pull/99916/)
110 - [Do not allow `Drop` impl on foreign ADTs](https://github.com/rust-lang/rust/pull/99576/)
114 - [Stabilize -Csplit-debuginfo on Linux](https://github.com/rust-lang/rust/pull/98051/)
115 - [Use niche-filling optimization even when multiple variants have data](https://github.com/rust-lang/rust/pull/94075/)
116 - [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)
117 - [Stringify non-shorthand visibility correctly](https://github.com/rust-lang/rust/pull/100350/)
118 - [Normalize struct field types when unsizing](https://github.com/rust-lang/rust/pull/101831/)
119 - [Update to LLVM 15](https://github.com/rust-lang/rust/pull/99464/)
120 - [Fix aarch64 call abi to correctly zeroext when needed](https://github.com/rust-lang/rust/pull/97800/)
121 - [debuginfo: Generalize C++-like encoding for enums](https://github.com/rust-lang/rust/pull/98393/)
122 - [Add `special_module_name` lint](https://github.com/rust-lang/rust/pull/94467/)
123 - [Add support for generating unique profraw files by default when using `-C instrument-coverage`](https://github.com/rust-lang/rust/pull/100384/)
124 - [Allow dynamic linking for iOS/tvOS targets](https://github.com/rust-lang/rust/pull/100636/)
128 - [Add armv4t-none-eabi as a tier 3 target](https://github.com/rust-lang/rust/pull/100244/)
129 - [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets](https://github.com/rust-lang/rust/pull/101025/)
130 - Refer to Rust's [platform support page][platform-support-doc] for more
131 information on Rust's tiered platform support.
136 - [Don't generate `PartialEq::ne` in derive(PartialEq)](https://github.com/rust-lang/rust/pull/98655/)
137 - [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default](https://github.com/rust-lang/rust/pull/101325/)
138 - [Forbid mixing `System` with direct system allocator calls](https://github.com/rust-lang/rust/pull/101394/)
139 - [Document no support for writing to non-blocking stdio/stderr](https://github.com/rust-lang/rust/pull/101416/)
140 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295)
141 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
146 - [`std::backtrace::Backtrace`](https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html)
147 - [`Bound::as_ref`](https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref)
148 - [`std::io::read_to_string`](https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html)
149 - [`<*const T>::cast_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut)
150 - [`<*mut T>::cast_const`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const)
152 These APIs are now stable in const contexts:
154 - [`<*const T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
155 - [`<*mut T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
160 - [Apply GitHub fast path even for partial hashes](https://github.com/rust-lang/cargo/pull/10807/)
161 - [Do not add home bin path to PATH if it's already there](https://github.com/rust-lang/cargo/pull/11023/)
162 - [Take priority into account within the pending queue](https://github.com/rust-lang/cargo/pull/11032/).
163 This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds.
168 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295).
169 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
170 - [`PollFn` now only implements `Unpin` if the closure is `Unpin`](https://github.com/rust-lang/rust/pull/102737).
171 This is a possible breaking change if users were relying on the blanket unpin implementation.
172 See discussion on the PR for details of why this change was made.
173 - [Drop ExactSizeIterator impl from std::char::EscapeAscii](https://github.com/rust-lang/rust/pull/99880)
174 This is a backwards-incompatible change to the standard library's surface
175 area, but is unlikely to affect real world usage.
176 - [Do not consider a single repeated lifetime eligible for elision in the return type](https://github.com/rust-lang/rust/pull/103450)
177 This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again.
178 - [Reenable disabled early syntax gates as future-incompatibility lints](https://github.com/rust-lang/rust/pull/99935/)
179 - [Update the minimum external LLVM to 13](https://github.com/rust-lang/rust/pull/100460/)
180 - [Don't duplicate file descriptors into stdio fds](https://github.com/rust-lang/rust/pull/101426/)
181 - [Sunset RLS](https://github.com/rust-lang/rust/pull/100863/)
182 - [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type](https://github.com/rust-lang/rust/pull/99784/)
183 This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny.
184 - [`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)
185 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.
186 - 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].
188 [102754]: https://github.com/rust-lang/rust/issues/102754
193 These changes do not affect any public interfaces of Rust, but they represent
194 significant improvements to the performance or internals of rustc and related
197 - [Add `x.sh` and `x.ps1` shell scripts](https://github.com/rust-lang/rust/pull/99992/)
198 - [compiletest: use target cfg instead of hard-coded tables](https://github.com/rust-lang/rust/pull/100260/)
199 - [Use object instead of LLVM for reading bitcode from rlibs](https://github.com/rust-lang/rust/pull/98100/)
200 - [Enable MIR inlining for optimized compilations](https://github.com/rust-lang/rust/pull/91743)
201 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).
203 Version 1.64.0 (2022-09-22)
204 ===========================
208 - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
209 - 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/)
210 - 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.
214 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
215 - Refer to Rust's [platform support page][platform-support-doc] for more
216 information on Rust's tiered platform support.
217 - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
218 - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
219 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
223 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
224 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
225 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
226 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
227 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
228 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
229 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
230 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
235 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
236 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
237 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
238 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
239 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
240 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
241 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
242 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
243 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
244 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
245 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
246 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
247 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
248 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
249 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
250 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
251 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
252 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
253 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
255 These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
257 - [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
258 - [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
259 - [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
260 - [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
261 - [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
262 - [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
264 These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
266 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
267 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
268 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
269 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
270 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
271 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
272 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
273 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
274 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
275 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
276 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
277 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
278 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
280 These APIs are now usable in const contexts:
282 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
286 - [Packages can now inherit settings from the workspace so that the settings
287 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
288 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
290 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
291 for more details on how to define these common settings.
292 - [Cargo commands can now accept multiple `--target` flags to build for
293 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
294 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
295 config option may now take an array of multiple targets.
296 - [The `--jobs` argument can now take a negative number to count backwards from
297 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
298 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
299 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
300 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
301 flag to `cargo rustc` to override the crate type.
302 - [Significantly improved the performance fetching git dependencies from GitHub
303 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
307 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
311 - 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/)
312 - [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.
313 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
314 - [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.
315 - [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.
316 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
317 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
318 - 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/).
319 - [`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.
324 These changes do not affect any public interfaces of Rust, but they represent
325 significant improvements to the performance or internals of rustc and related
328 - 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/)
329 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
330 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
331 - Many improvements to generated code for derives, including performance improvements:
332 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
333 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
334 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
335 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
336 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
337 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
338 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
339 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
340 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
341 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
342 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
344 Version 1.63.0 (2022-08-11)
345 ==========================
349 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
350 - [Modify MIR building to drop repeat expressions with length zero.][95953]
351 - [Remove label/lifetime shadowing warnings.][96296]
352 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
353 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
354 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
355 - [lub: don't bail out due to empty binders.][97867]
359 - [Stabilize the `bundle` native library modifier,][95818] also removing the
360 deprecated `static-nobundle` linking kind.
361 - [Add Apple WatchOS compile targets\*.][95243]
362 - [Add a Windows application manifest to rustc-main.][96737]
364 \* Refer to Rust's [platform support page][platform-support-doc] for more
365 information on Rust's tiered platform support.
369 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
370 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
371 - [`impl Read and Write for VecDeque<u8>`.][95632]
372 - [STD support for the Nintendo 3DS.][95897]
373 - [Use rounding in float to Duration conversion methods.][96051]
374 - [Make write/print macros eagerly drop temporaries.][96455]
375 - [Implement internal traits that enable `[OsStr]::join`.][96881]
376 - [Implement `Hash` for `core::alloc::Layout`.][97034]
377 - [Add capacity documentation for `OsString`.][97202]
378 - [Put a bound on collection misbehavior.][97316]
379 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
380 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
381 - [Document Rust's stance on `/proc/self/mem`.][97837]
388 - [`BinaryHeap::try_reserve`]
389 - [`BinaryHeap::try_reserve_exact`]
390 - [`OsString::try_reserve`]
391 - [`OsString::try_reserve_exact`]
392 - [`PathBuf::try_reserve`]
393 - [`PathBuf::try_reserve_exact`]
394 - [`Path::try_exists`]
395 - [`Ref::filter_map`]
396 - [`RefMut::filter_map`]
397 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
398 - [`ToOwned::clone_into`]
399 - [`Ipv6Addr::to_ipv4_mapped`]
401 - [`unix::io::BorrowedFd<'fd>`]
402 - [`unix::io::OwnedFd`]
403 - [`windows::io::AsHandle`]
404 - [`windows::io::BorrowedHandle<'handle>`]
405 - [`windows::io::OwnedHandle`]
406 - [`windows::io::HandleOrInvalid`]
407 - [`windows::io::HandleOrNull`]
408 - [`windows::io::InvalidHandleError`]
409 - [`windows::io::NullHandleError`]
410 - [`windows::io::AsSocket`]
411 - [`windows::io::BorrowedSocket<'handle>`]
412 - [`windows::io::OwnedSocket`]
415 - [`thread::ScopedJoinHandle`]
417 These APIs are now usable in const contexts:
419 - [`array::from_ref`]
420 - [`slice::from_ref`]
421 - [`intrinsics::copy`]
422 - [`intrinsics::copy_nonoverlapping`]
423 - [`<*const T>::copy_to`]
424 - [`<*const T>::copy_to_nonoverlapping`]
425 - [`<*mut T>::copy_to`]
426 - [`<*mut T>::copy_to_nonoverlapping`]
427 - [`<*mut T>::copy_from`]
428 - [`<*mut T>::copy_from_nonoverlapping`]
430 - [`Utf8Error::error_len`]
431 - [`Utf8Error::valid_up_to`]
438 - [Stabilize the `--config path` command-line argument.][cargo/10755]
439 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
444 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
445 errors for invalid attribute arguments that were previously ignored.
446 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
447 duration can differ slightly from what it was.
452 These changes provide no direct user facing benefits, but represent significant
453 improvements to the internals and overall performance of rustc
456 - [Prepare Rust for LLVM opaque pointers.][94214]
458 [94214]: https://github.com/rust-lang/rust/pull/94214/
459 [94530]: https://github.com/rust-lang/rust/pull/94530/
460 [94954]: https://github.com/rust-lang/rust/pull/94954/
461 [95243]: https://github.com/rust-lang/rust/pull/95243/
462 [95565]: https://github.com/rust-lang/rust/pull/95565/
463 [95632]: https://github.com/rust-lang/rust/pull/95632/
464 [95818]: https://github.com/rust-lang/rust/pull/95818/
465 [95897]: https://github.com/rust-lang/rust/pull/95897/
466 [95953]: https://github.com/rust-lang/rust/pull/95953/
467 [96051]: https://github.com/rust-lang/rust/pull/96051/
468 [96296]: https://github.com/rust-lang/rust/pull/96296/
469 [96455]: https://github.com/rust-lang/rust/pull/96455/
470 [96737]: https://github.com/rust-lang/rust/pull/96737/
471 [96868]: https://github.com/rust-lang/rust/pull/96868/
472 [96881]: https://github.com/rust-lang/rust/pull/96881/
473 [96885]: https://github.com/rust-lang/rust/pull/96885/
474 [96959]: https://github.com/rust-lang/rust/pull/96959/
475 [97034]: https://github.com/rust-lang/rust/pull/97034/
476 [97202]: https://github.com/rust-lang/rust/pull/97202/
477 [97316]: https://github.com/rust-lang/rust/pull/97316/
478 [97652]: https://github.com/rust-lang/rust/pull/97652/
479 [97675]: https://github.com/rust-lang/rust/pull/97675/
480 [97803]: https://github.com/rust-lang/rust/pull/97803/
481 [97837]: https://github.com/rust-lang/rust/pull/97837/
482 [97867]: https://github.com/rust-lang/rust/pull/97867/
483 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
484 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
486 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
487 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
488 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
489 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
490 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
491 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
492 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
493 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
494 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
495 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
496 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
497 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
498 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
499 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
500 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
501 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
502 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
503 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
504 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
505 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
506 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
507 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
508 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
509 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
510 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
511 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
512 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
513 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
514 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
515 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
517 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
518 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
519 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
520 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
521 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
522 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
523 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
524 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
525 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
526 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
527 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
528 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
529 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
530 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
531 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
532 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
534 Version 1.62.1 (2022-07-19)
535 ==========================
537 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
538 library, and also mitigates a CPU vulnerability on Intel SGX.
540 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
541 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
542 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
543 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
544 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
546 [98608]: https://github.com/rust-lang/rust/issues/98608
547 [98890]: https://github.com/rust-lang/rust/issues/98890
548 [98950]: https://github.com/rust-lang/rust/pull/98950
549 [98126]: https://github.com/rust-lang/rust/pull/98126
550 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
552 Version 1.62.0 (2022-06-30)
553 ==========================
558 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
559 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
560 - [Fix constants not getting dropped if part of a diverging expression][94775]
561 - [Support unit struct/enum variant in destructuring assignment][95380]
562 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
563 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
568 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
569 - [Make `unaligned_references` lint deny-by-default][95372]
570 This lint is also a future compatibility lint, and is expected to eventually
572 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
573 - [Reject `#[thread_local]` attribute on non-static items][95006]
574 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
575 - [Implement a lint to warn about unused macro rules][96150]
576 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
578 \* Refer to Rust's [platform support page][platform-support-doc] for more
579 information on Rust's tiered platform support.
584 - [Windows: Use a pipe relay for chaining pipes][95841]
585 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
586 - [Replace RwLock by a futex based one on Linux][95801]
587 - [std: directly use pthread in UNIX parker implementation][96393]
592 - [`bool::then_some`]
596 - [`windows::CommandExt::raw_arg`]
597 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
598 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
599 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
600 - [`FusedIterator for EncodeWide`]
601 - [RDM intrinsics on aarch64][stdarch/1285]
606 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
611 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
613 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
614 - Package ID specs now support `name@version` syntax in addition to the
615 previous `name:version` to align with the behavior in `cargo add` and other
616 tools. `cargo install` and `cargo yank` also now support this syntax so the
617 version does not need to passed as a separate flag.
618 - The `git` and `registry` directories in Cargo's home directory (usually
619 `~/.cargo`) are now marked as cache directories so that they are not
620 included in backups or content indexing (on Windows).
621 - Added automatic `@` argfile support, which will use "response files" if the
622 command-line to `rustc` exceeds the operating system's limit.
627 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
628 the same as the host target.
629 [#10594](https://github.com/rust-lang/cargo/pull/10594)
630 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
631 - [rustdoc: Remove .woff font files][96279]
632 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
633 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
634 complete synchronously][95469].
639 - [Unify ReentrantMutex implementations across all platforms][96042]
641 These changes provide no direct user facing benefits, but represent significant
642 improvements to the internals and overall performance of rustc
645 [93313]: https://github.com/rust-lang/rust/pull/93313/
646 [93969]: https://github.com/rust-lang/rust/pull/93969/
647 [94206]: https://github.com/rust-lang/rust/pull/94206/
648 [94457]: https://github.com/rust-lang/rust/pull/94457/
649 [94775]: https://github.com/rust-lang/rust/pull/94775/
650 [94872]: https://github.com/rust-lang/rust/pull/94872/
651 [95006]: https://github.com/rust-lang/rust/pull/95006/
652 [95035]: https://github.com/rust-lang/rust/pull/95035/
653 [95346]: https://github.com/rust-lang/rust/pull/95346/
654 [95372]: https://github.com/rust-lang/rust/pull/95372/
655 [95380]: https://github.com/rust-lang/rust/pull/95380/
656 [95431]: https://github.com/rust-lang/rust/pull/95431/
657 [95469]: https://github.com/rust-lang/rust/pull/95469/
658 [95705]: https://github.com/rust-lang/rust/pull/95705/
659 [95801]: https://github.com/rust-lang/rust/pull/95801/
660 [95819]: https://github.com/rust-lang/rust/pull/95819/
661 [95841]: https://github.com/rust-lang/rust/pull/95841/
662 [96042]: https://github.com/rust-lang/rust/pull/96042/
663 [96150]: https://github.com/rust-lang/rust/pull/96150/
664 [96268]: https://github.com/rust-lang/rust/pull/96268/
665 [96279]: https://github.com/rust-lang/rust/pull/96279/
666 [96393]: https://github.com/rust-lang/rust/pull/96393/
667 [96436]: https://github.com/rust-lang/rust/pull/96436/
668 [96557]: https://github.com/rust-lang/rust/pull/96557/
669 [96630]: https://github.com/rust-lang/rust/pull/96630/
671 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
672 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
673 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
674 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
675 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
676 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
677 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
678 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
679 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
680 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
682 Version 1.61.0 (2022-05-19)
683 ==========================
688 - [`const fn` signatures can now include generic trait bounds][93827]
689 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
690 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
691 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
696 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
697 - [The `char` type is now described as UTF-32 in debuginfo][89887]
698 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
699 - X86 [`#[target_feature = "adx"]` is now stable][93745]
704 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
705 - [`#[ignore = "…"]` messages are printed when running tests][92714]
706 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
707 - [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.
708 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
709 - [`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.
714 - [`Pin::static_mut`]
715 - [`Pin::static_ref`]
716 - [`Vec::retain_mut`]
717 - [`VecDeque::retain_mut`]
718 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
719 - [`std::os::unix::net::SocketAddr::from_pathname`]
720 - [`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.
721 - [`std::thread::JoinHandle::is_finished`]
723 These APIs are now usable in const contexts:
725 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
726 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
727 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
728 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
729 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
730 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
731 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
732 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
733 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
738 No feature changes, but see compatibility notes.
743 - 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
744 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
745 - (less common) or be updated to use the [`+whole-archive`] modifier.
746 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
747 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
748 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
749 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
750 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
751 - [`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`.
752 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
757 These changes provide no direct user facing benefits, but represent significant
758 improvements to the internals and overall performance of rustc
761 - [debuginfo: Refactor debuginfo generation for types][94261]
762 - [Remove the everybody loops pass][93913]
764 [88375]: https://github.com/rust-lang/rust/pull/88375/
765 [89887]: https://github.com/rust-lang/rust/pull/89887/
766 [90621]: https://github.com/rust-lang/rust/pull/90621/
767 [92285]: https://github.com/rust-lang/rust/pull/92285/
768 [92472]: https://github.com/rust-lang/rust/pull/92472/
769 [92697]: https://github.com/rust-lang/rust/pull/92697/
770 [92714]: https://github.com/rust-lang/rust/pull/92714/
771 [92911]: https://github.com/rust-lang/rust/pull/92911/
772 [93263]: https://github.com/rust-lang/rust/pull/93263/
773 [93745]: https://github.com/rust-lang/rust/pull/93745/
774 [93827]: https://github.com/rust-lang/rust/pull/93827/
775 [93901]: https://github.com/rust-lang/rust/pull/93901/
776 [93913]: https://github.com/rust-lang/rust/pull/93913/
777 [93965]: https://github.com/rust-lang/rust/pull/93965/
778 [94081]: https://github.com/rust-lang/rust/pull/94081/
779 [94261]: https://github.com/rust-lang/rust/pull/94261/
780 [94295]: https://github.com/rust-lang/rust/pull/94295/
781 [94832]: https://github.com/rust-lang/rust/pull/94832/
782 [95016]: https://github.com/rust-lang/rust/pull/95016/
783 [95251]: https://github.com/rust-lang/rust/pull/95251/
784 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
785 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
786 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
787 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
788 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
789 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
790 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
791 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
792 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
793 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
794 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
795 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
796 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
797 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
798 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
799 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
800 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
801 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
802 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
803 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
804 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
805 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
808 Version 1.60.0 (2022-04-07)
809 ==========================
813 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
814 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
818 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
819 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
820 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
821 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
822 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
823 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
824 - [Fix invalid removal of newlines from doc comments][92357]
825 - [Add kernel target for RustyHermit][92670]
826 - [Deny mixing bin crate type with lib crate types][92933]
827 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
828 - [Upgrade to LLVM 14][93577]
830 \* Refer to Rust's [platform support page][platform-support-doc] for more
831 information on Rust's tiered platform support.
835 - [Guarantee call order for `sort_by_cached_key`][89621]
836 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
837 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
838 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
839 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
843 - [`Arc::new_cyclic`][arc_new_cyclic]
844 - [`Rc::new_cyclic`][rc_new_cyclic]
845 - [`slice::EscapeAscii`][slice_escape_ascii]
846 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
847 - [`u8::escape_ascii`][u8_escape_ascii]
848 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
849 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
850 - [`MaybeUninit::assume_init_read`][assume_init_read]
851 - [`i8::abs_diff`][i8_abs_diff]
852 - [`i16::abs_diff`][i16_abs_diff]
853 - [`i32::abs_diff`][i32_abs_diff]
854 - [`i64::abs_diff`][i64_abs_diff]
855 - [`i128::abs_diff`][i128_abs_diff]
856 - [`isize::abs_diff`][isize_abs_diff]
857 - [`u8::abs_diff`][u8_abs_diff]
858 - [`u16::abs_diff`][u16_abs_diff]
859 - [`u32::abs_diff`][u32_abs_diff]
860 - [`u64::abs_diff`][u64_abs_diff]
861 - [`u128::abs_diff`][u128_abs_diff]
862 - [`usize::abs_diff`][usize_abs_diff]
863 - [`Display for io::ErrorKind`][display_error_kind]
864 - [`From<u8> for ExitCode`][from_u8_exit_code]
865 - [`Not for !` (the "never" type)][not_never]
866 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
867 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
871 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
872 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
873 - [Stabilize namespaced and weak dependency features.][cargo/10269]
874 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
875 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
879 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
880 - [Drop rustc-docs from complete profile][93742]
881 - [bootstrap: tidy up flag handling for llvm build][93918]
885 - [Remove compiler-rt linking hack on Android][83822]
886 - [Mitigations for platforms with non-monotonic clocks have been removed from
887 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
888 instant is not guaranteed to be greater than an earlier instant anymore.
889 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
890 saturating to `0` instead][89926]. In the real world the panic happened mostly
891 on platforms with buggy monotonic clock implementations rather than catching
892 programming errors like reversing the start and end times. Such programming
893 errors will now results in `0` rather than a panic.
894 - In a future release we're planning to increase the baseline requirements for
895 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
896 your feedback in [PR #95026][95026].
901 These changes provide no direct user facing benefits, but represent significant
902 improvements to the internals and overall performance of rustc
905 - [Switch all libraries to the 2021 edition][92068]
907 [83822]: https://github.com/rust-lang/rust/pull/83822
908 [86374]: https://github.com/rust-lang/rust/pull/86374
909 [87487]: https://github.com/rust-lang/rust/pull/87487
910 [89621]: https://github.com/rust-lang/rust/pull/89621
911 [89926]: https://github.com/rust-lang/rust/pull/89926
912 [90132]: https://github.com/rust-lang/rust/pull/90132
913 [90247]: https://github.com/rust-lang/rust/pull/90247
914 [91606]: https://github.com/rust-lang/rust/pull/91606
915 [92068]: https://github.com/rust-lang/rust/pull/92068
916 [92300]: https://github.com/rust-lang/rust/pull/92300
917 [92357]: https://github.com/rust-lang/rust/pull/92357
918 [92383]: https://github.com/rust-lang/rust/pull/92383
919 [92630]: https://github.com/rust-lang/rust/pull/92630
920 [92670]: https://github.com/rust-lang/rust/pull/92670
921 [92800]: https://github.com/rust-lang/rust/pull/92800
922 [92933]: https://github.com/rust-lang/rust/pull/92933
923 [93566]: https://github.com/rust-lang/rust/pull/93566
924 [93577]: https://github.com/rust-lang/rust/pull/93577
925 [93658]: https://github.com/rust-lang/rust/pull/93658
926 [93742]: https://github.com/rust-lang/rust/pull/93742
927 [93824]: https://github.com/rust-lang/rust/pull/93824
928 [93918]: https://github.com/rust-lang/rust/pull/93918
929 [95026]: https://github.com/rust-lang/rust/pull/95026
931 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
932 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
933 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
934 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
935 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
937 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
938 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
939 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
940 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
941 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
942 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
943 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
944 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
945 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
946 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
947 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
948 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
949 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
950 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
951 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
952 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
953 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
954 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
955 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
956 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
957 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
958 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
959 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
960 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
961 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
963 Version 1.59.0 (2022-02-24)
964 ==========================
969 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
970 - [Stabilize destructuring assignment][90521]
971 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
972 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
977 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
978 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
979 - [Fix sparc64 ABI for aggregates with floating point members][91003]
980 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
981 - [Add support for riscv64gc-unknown-freebsd][91284]
982 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
983 - [Soft disable incremental compilation][94124]
985 This release disables incremental compilation, unless the user has explicitly
986 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
987 This is due to a known and relatively frequently occurring bug in incremental
988 compilation, which causes builds to issue internal compiler errors. This
989 particular bug is already fixed on nightly, but that fix has not yet rolled out
990 to stable and is deemed too risky for a direct stable backport.
992 As always, we encourage users to test with nightly and report bugs so that we
993 can track failures and fix issues earlier.
995 See [94124] for more details.
997 [94124]: https://github.com/rust-lang/rust/issues/94124
1002 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
1007 - [`std::thread::available_parallelism`][available_parallelism]
1008 - [`Result::copied`][result-copied]
1009 - [`Result::cloned`][result-cloned]
1010 - [`arch::asm!`][asm]
1011 - [`arch::global_asm!`][global_asm]
1012 - [`ops::ControlFlow::is_break`][is_break]
1013 - [`ops::ControlFlow::is_continue`][is_continue]
1014 - [`TryFrom<char> for u8`][try_from_char_u8]
1015 - [`char::TryFromCharError`][try_from_char_err]
1016 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
1017 - [`iter::zip`][zip]
1018 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
1019 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
1020 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
1021 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
1022 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
1023 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
1024 - [`DoubleEndedIterator for ToLowercase`][lowercase]
1025 - [`DoubleEndedIterator for ToUppercase`][uppercase]
1026 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
1027 - [`UnwindSafe for Once`][unwindsafe_once]
1028 - [`RefUnwindSafe for Once`][refunwindsafe_once]
1029 - [armv8 neon intrinsics for aarch64][stdarch/1266]
1033 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
1034 - [`mem::MaybeUninit::assume_init`][muninit_init]
1035 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
1036 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
1041 - [Stabilize the `strip` profile option][cargo/10088]
1042 - [Stabilize future-incompat-report][cargo/10165]
1043 - [Support abbreviating `--release` as `-r`][cargo/10133]
1044 - [Support `term.quiet` configuration][cargo/10152]
1045 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
1050 - [Refactor weak symbols in std::sys::unix][90846]
1051 This may add new, versioned, symbols when building with a newer glibc, as the
1052 standard library uses weak linkage rather than dynamically attempting to load
1053 certain symbols at runtime.
1054 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
1055 This adds a future compatibility lint to supporting the use of cfg_attr
1056 wrapping either crate_type or crate_name specification within Rust files;
1057 it is recommended that users migrate to setting the equivalent command line
1059 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
1060 This may expose new names, leading to conflicts with preexisting names in a
1061 given namespace and a compilation failure.
1062 - [Cargo will document libraries before binaries.][cargo/10172]
1063 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
1064 - [Weaken guarantee around advancing underlying iterators in zip][83791]
1065 - [Make split_inclusive() on an empty slice yield an empty output][89825]
1066 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
1067 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
1072 These changes provide no direct user facing benefits, but represent significant
1073 improvements to the internals and overall performance of rustc
1076 - [Fix many cases of normalization-related ICEs][91255]
1077 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
1078 - [Store liveness in interval sets for region inference][90637]
1080 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
1081 unstable feature.][91867]
1083 [91867]: https://github.com/rust-lang/rust/issues/91867
1084 [83744]: https://github.com/rust-lang/rust/pull/83744/
1085 [83791]: https://github.com/rust-lang/rust/pull/83791/
1086 [85013]: https://github.com/rust-lang/rust/pull/85013/
1087 [89825]: https://github.com/rust-lang/rust/pull/89825/
1088 [89999]: https://github.com/rust-lang/rust/pull/89999/
1089 [90128]: https://github.com/rust-lang/rust/pull/90128/
1090 [90207]: https://github.com/rust-lang/rust/pull/90207/
1091 [90521]: https://github.com/rust-lang/rust/pull/90521/
1092 [90586]: https://github.com/rust-lang/rust/pull/90586/
1093 [90637]: https://github.com/rust-lang/rust/pull/90637/
1094 [90833]: https://github.com/rust-lang/rust/pull/90833/
1095 [90846]: https://github.com/rust-lang/rust/pull/90846/
1096 [91003]: https://github.com/rust-lang/rust/pull/91003/
1097 [91172]: https://github.com/rust-lang/rust/pull/91172/
1098 [91255]: https://github.com/rust-lang/rust/pull/91255/
1099 [91284]: https://github.com/rust-lang/rust/pull/91284/
1100 [91535]: https://github.com/rust-lang/rust/pull/91535/
1101 [91593]: https://github.com/rust-lang/rust/pull/91593/
1102 [91728]: https://github.com/rust-lang/rust/pull/91728/
1103 [91878]: https://github.com/rust-lang/rust/pull/91878/
1104 [91896]: https://github.com/rust-lang/rust/pull/91896/
1105 [91926]: https://github.com/rust-lang/rust/pull/91926/
1106 [91984]: https://github.com/rust-lang/rust/pull/91984/
1107 [92020]: https://github.com/rust-lang/rust/pull/92020/
1108 [92034]: https://github.com/rust-lang/rust/pull/92034/
1109 [92137]: https://github.com/rust-lang/rust/pull/92137/
1110 [92483]: https://github.com/rust-lang/rust/pull/92483/
1111 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
1112 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
1113 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
1114 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
1115 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
1116 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
1117 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
1118 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
1120 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
1121 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
1122 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
1123 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1124 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
1125 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
1126 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
1127 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
1128 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
1129 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
1130 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
1131 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
1132 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
1133 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
1134 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
1135 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
1136 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
1137 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
1138 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
1139 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
1140 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
1141 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
1142 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
1143 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
1144 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
1145 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
1147 Version 1.58.1 (2022-01-19)
1148 ===========================
1150 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
1151 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
1152 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
1153 * [Fix wrong error message displayed when some imports are missing][91254]
1154 * [Fix rustfmt not formatting generated files from stdin][92912]
1156 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
1157 [91254]: https://github.com/rust-lang/rust/pull/91254
1158 [92912]: https://github.com/rust-lang/rust/pull/92912
1159 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
1160 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
1162 Version 1.58.0 (2022-01-13)
1163 ==========================
1168 - [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.
1169 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
1170 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
1175 - [Add LLVM CFI support to the Rust compiler][89652]
1176 - [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.
1177 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
1178 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
1179 - [Update the minimum external LLVM to 12][90175]
1180 - [Add `x86_64-unknown-none` at Tier 3*][89062]
1181 - [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.
1182 - [Don't abort compilation after giving a lint error][87337]
1183 - [Error messages point at the source of trait bound obligations in more places][89580]
1185 \* Refer to Rust's [platform support page][platform-support-doc] for more
1186 information on Rust's tiered platform support.
1191 - [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.
1192 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
1193 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
1194 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
1195 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
1196 - [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).
1201 - [`Metadata::is_symlink`]
1202 - [`Path::is_symlink`]
1203 - [`{integer}::saturating_div`]
1204 - [`Option::unwrap_unchecked`]
1205 - [`Result::unwrap_unchecked`]
1206 - [`Result::unwrap_err_unchecked`]
1209 These APIs are now usable in const contexts:
1212 - [`Duration::checked_add`]
1213 - [`Duration::saturating_add`]
1214 - [`Duration::checked_sub`]
1215 - [`Duration::saturating_sub`]
1216 - [`Duration::checked_mul`]
1217 - [`Duration::saturating_mul`]
1218 - [`Duration::checked_div`]
1223 - [Add --message-format for install command][cargo/10107]
1224 - [Warn when alias shadows external subcommand][cargo/10082]
1229 - [Show all Deref implementations recursively in rustdoc][90183]
1230 - [Use computed visibility in rustdoc][88447]
1235 - [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.
1236 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1237 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1238 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1239 - [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.
1240 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1245 These changes provide no direct user facing benefits, but represent significant
1246 improvements to the internals and overall performance of rustc
1249 - [Implement coherence checks for negative trait impls][90104]
1250 - [Add rustc lint, warning when iterating over hashmaps][89558]
1251 - [Optimize live point computation][90491]
1252 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1253 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1255 [87337]: https://github.com/rust-lang/rust/pull/87337/
1256 [87467]: https://github.com/rust-lang/rust/pull/87467/
1257 [87704]: https://github.com/rust-lang/rust/pull/87704/
1258 [88041]: https://github.com/rust-lang/rust/pull/88041/
1259 [88447]: https://github.com/rust-lang/rust/pull/88447/
1260 [88601]: https://github.com/rust-lang/rust/pull/88601/
1261 [89062]: https://github.com/rust-lang/rust/pull/89062/
1262 [89174]: https://github.com/rust-lang/rust/pull/89174/
1263 [89551]: https://github.com/rust-lang/rust/pull/89551/
1264 [89558]: https://github.com/rust-lang/rust/pull/89558/
1265 [89580]: https://github.com/rust-lang/rust/pull/89580/
1266 [89652]: https://github.com/rust-lang/rust/pull/89652/
1267 [90041]: https://github.com/rust-lang/rust/pull/90041/
1268 [90058]: https://github.com/rust-lang/rust/pull/90058/
1269 [90104]: https://github.com/rust-lang/rust/pull/90104/
1270 [90117]: https://github.com/rust-lang/rust/pull/90117/
1271 [90175]: https://github.com/rust-lang/rust/pull/90175/
1272 [90183]: https://github.com/rust-lang/rust/pull/90183/
1273 [90297]: https://github.com/rust-lang/rust/pull/90297/
1274 [90329]: https://github.com/rust-lang/rust/pull/90329/
1275 [90361]: https://github.com/rust-lang/rust/pull/90361/
1276 [90417]: https://github.com/rust-lang/rust/pull/90417/
1277 [90473]: https://github.com/rust-lang/rust/pull/90473/
1278 [90491]: https://github.com/rust-lang/rust/pull/90491/
1279 [90733]: https://github.com/rust-lang/rust/pull/90733/
1280 [90833]: https://github.com/rust-lang/rust/pull/90833/
1281 [90846]: https://github.com/rust-lang/rust/pull/90846/
1282 [91026]: https://github.com/rust-lang/rust/pull/91026/
1283 [91207]: https://github.com/rust-lang/rust/pull/91207/
1284 [91255]: https://github.com/rust-lang/rust/pull/91255/
1285 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1286 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1287 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1288 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1289 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1290 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1291 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1292 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1293 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1294 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1296 Version 1.57.0 (2021-12-02)
1297 ==========================
1302 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1303 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1304 - [Allow panicking in constant evaluation.][89508]
1305 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1310 - [Create more accurate debuginfo for vtables.][89597]
1311 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1312 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1313 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1314 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1316 \* Refer to Rust's [platform support page][platform-support-doc] for more
1317 information on Rust's tiered platform support.
1322 - [Avoid allocations and copying in `Vec::leak`][89337]
1323 - [Add `#[repr(i8)]` to `Ordering`][89507]
1324 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1325 - [Update to Unicode 14.0][89614]
1326 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1327 when ignoring their return value. This helps catch mistakes such as expecting
1328 a function to mutate a value in place rather than return a new value.
1333 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1334 - [`[T; N]::as_slice`][`array::as_slice`]
1335 - [`collections::TryReserveError`]
1336 - [`HashMap::try_reserve`]
1337 - [`HashSet::try_reserve`]
1338 - [`String::try_reserve`]
1339 - [`String::try_reserve_exact`]
1340 - [`Vec::try_reserve`]
1341 - [`Vec::try_reserve_exact`]
1342 - [`VecDeque::try_reserve`]
1343 - [`VecDeque::try_reserve_exact`]
1344 - [`Iterator::map_while`]
1345 - [`iter::MapWhile`]
1346 - [`proc_macro::is_available`]
1347 - [`Command::get_program`]
1348 - [`Command::get_args`]
1349 - [`Command::get_envs`]
1350 - [`Command::get_current_dir`]
1354 These APIs are now usable in const contexts:
1356 - [`hint::unreachable_unchecked`]
1361 - [Stabilize custom profiles][cargo/9943]
1366 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1367 This will break some builds that set `#![deny(dead_code)]`.
1371 These changes provide no direct user facing benefits, but represent significant
1372 improvements to the internals and overall performance of rustc
1375 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1377 [85200]: https://github.com/rust-lang/rust/pull/85200/
1378 [86191]: https://github.com/rust-lang/rust/pull/86191/
1379 [87220]: https://github.com/rust-lang/rust/pull/87220/
1380 [87260]: https://github.com/rust-lang/rust/pull/87260/
1381 [88321]: https://github.com/rust-lang/rust/pull/88321/
1382 [88529]: https://github.com/rust-lang/rust/pull/88529/
1383 [88690]: https://github.com/rust-lang/rust/pull/88690/
1384 [88952]: https://github.com/rust-lang/rust/pull/88952/
1385 [89337]: https://github.com/rust-lang/rust/pull/89337/
1386 [89507]: https://github.com/rust-lang/rust/pull/89507/
1387 [89508]: https://github.com/rust-lang/rust/pull/89508/
1388 [89582]: https://github.com/rust-lang/rust/pull/89582/
1389 [89597]: https://github.com/rust-lang/rust/pull/89597/
1390 [89614]: https://github.com/rust-lang/rust/pull/89614/
1391 [89692]: https://github.com/rust-lang/rust/issues/89692/
1392 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1393 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1394 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1395 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1396 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1397 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1398 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1399 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1400 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1401 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1402 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1403 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1404 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1405 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1406 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1407 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1408 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1409 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1410 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1411 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1412 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1414 Version 1.56.1 (2021-11-01)
1415 ===========================
1417 - New lints to detect the presence of bidirectional-override Unicode
1418 codepoints in the compiled source code ([CVE-2021-42574])
1420 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1422 Version 1.56.0 (2021-10-21)
1423 ========================
1428 - [The 2021 Edition is now stable.][rust#88100]
1429 See [the edition guide][rust-2021-edition-guide] for more details.
1430 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1431 - [Union field access is permitted in `const fn`.][rust#85769]
1433 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1438 - [Upgrade to LLVM 13.][rust#87570]
1439 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1440 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1441 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1442 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1443 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1444 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1445 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1447 \* Refer to Rust's [platform support page][platform-support-doc] for more
1448 information on Rust's tiered platform support.
1453 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1454 The Windows console still requires valid Unicode, but this change allows
1455 splitting a UTF-8 character across multiple write calls. This allows, for
1456 instance, programs that just read and write data buffers (e.g. copying a file
1457 to stdout) without regard for Unicode or character boundaries.
1458 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1459 For this use case, atomics scale much better under contention.
1460 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1461 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1462 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1463 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1464 - [Treat invalid environment variable names as non-existent.][rust#86183]
1465 Previously, the environment functions would panic if given a variable name
1466 with an internal null character or equal sign (`=`). Now, these functions will
1467 just treat such names as non-existent variables, since the OS cannot represent
1468 the existence of a variable with such a name.
1473 - [`std::os::unix::fs::chroot`]
1474 - [`UnsafeCell::raw_get`]
1475 - [`BufWriter::into_parts`]
1476 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1477 These APIs were previously stable in `std`, but are now also available in `core`.
1478 - [`Vec::shrink_to`]
1479 - [`String::shrink_to`]
1480 - [`OsString::shrink_to`]
1481 - [`PathBuf::shrink_to`]
1482 - [`BinaryHeap::shrink_to`]
1483 - [`VecDeque::shrink_to`]
1484 - [`HashMap::shrink_to`]
1485 - [`HashSet::shrink_to`]
1487 These APIs are now usable in const contexts:
1489 - [`std::mem::transmute`]
1490 - [`[T]::first`][`slice::first`]
1491 - [`[T]::split_first`][`slice::split_first`]
1492 - [`[T]::last`][`slice::last`]
1493 - [`[T]::split_last`][`slice::split_last`]
1498 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1499 This has no effect at present on dependency version selection.
1500 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1501 that support Rust code to include a crate's specified minimum version in the test matrix for that
1507 - [Update to new argument parsing rules on Windows.][rust#87580]
1508 This adjusts Rust's standard library to match the behavior of the standard
1509 libraries for C/C++. The rules have changed slightly over time, and this PR
1510 brings us to the latest set of rules (changed in 2008).
1511 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1512 This was already not supported by LLVM; this change surfaces this lack of
1513 support with a better error message.
1514 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1515 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1516 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1517 may return different values on glibc <= 2.24.][rust#81825]
1518 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1519 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1520 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1521 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1525 These changes provide no direct user facing benefits, but represent significant
1526 improvements to the internals and overall performance of rustc
1529 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1530 This improves the performance of most Rust builds.
1531 - [Unify representation of macros in internal data structures.][rust#88019]
1532 This change fixes a host of bugs with the handling of macros by the compiler,
1535 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1536 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1537 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1538 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1539 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1540 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1541 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1542 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1543 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1544 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1545 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1546 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1547 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1548 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1549 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1550 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1551 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1552 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1553 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1554 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1555 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1556 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1557 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1558 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1559 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1560 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1561 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1562 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1563 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1564 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1565 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1566 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1567 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1568 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1569 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1570 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1571 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1572 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1573 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1574 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1575 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1576 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1578 Version 1.55.0 (2021-09-09)
1579 ============================
1583 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1584 will end at the maximum value of the integer.][83918]
1585 - [You can now explicitly import the prelude of different editions
1586 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1590 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1592 \* Refer to Rust's [platform support page][platform-support-doc] for more
1593 information on Rust's tiered platform support.
1598 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1599 These improvements should in general provide faster string parsing of floats,
1600 no longer reject certain valid floating point values, and reduce
1601 the produced code size for non-stripped artifacts.
1602 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1609 - [`IntoInnerError::into_error`]
1610 - [`IntoInnerError::into_parts`]
1611 - [`MaybeUninit::assume_init_mut`]
1612 - [`MaybeUninit::assume_init_ref`]
1613 - [`MaybeUninit::write`]
1615 - [`ops::ControlFlow`]
1617 - [`x86::_bittestandcomplement`]
1618 - [`x86::_bittestandreset`]
1619 - [`x86::_bittestandset`]
1620 - [`x86_64::_bittest64`]
1621 - [`x86_64::_bittestandcomplement64`]
1622 - [`x86_64::_bittestandreset64`]
1623 - [`x86_64::_bittestandset64`]
1625 The following previously stable functions are now `const`.
1627 - [`str::from_utf8_unchecked`]
1632 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1633 rustc in parallel such as when using `cargo test`.][cargo/9675]
1634 - [The package definition in `cargo metadata` now includes the `"default_run"`
1635 field from the manifest.][cargo/9550]
1636 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1637 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1638 of packages.][cargo/9663]
1642 - [Added "Go to item on exact match" search option.][85876]
1643 - [The "Implementors" section on traits no longer shows redundant
1644 method definitions.][85970]
1645 - [Trait implementations are toggled open by default.][86260] This should make the
1646 implementations more searchable by tools like `CTRL+F` in your browser.
1647 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1648 through type aliases.][86334]
1649 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1650 "Trait Implementations" section.][86513]
1655 - [std functions that return an `io::Error` will no longer use the
1656 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1657 kinds of errors could be categorised [into newer more specific `ErrorKind`
1658 variants][79965], and that they do not represent a user error.
1659 - [Using environment variable names with `process::Command` on Windows now
1660 behaves as expected.][85270] Previously using envionment variables with
1661 `Command` would cause them to be ASCII-uppercased.
1662 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1663 with `rustdoc::`][86849]
1664 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1665 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1666 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1669 [86849]: https://github.com/rust-lang/rust/pull/86849
1670 [86513]: https://github.com/rust-lang/rust/pull/86513
1671 [86334]: https://github.com/rust-lang/rust/pull/86334
1672 [86260]: https://github.com/rust-lang/rust/pull/86260
1673 [85970]: https://github.com/rust-lang/rust/pull/85970
1674 [85876]: https://github.com/rust-lang/rust/pull/85876
1675 [83572]: https://github.com/rust-lang/rust/pull/83572
1676 [86294]: https://github.com/rust-lang/rust/pull/86294
1677 [86858]: https://github.com/rust-lang/rust/pull/86858
1678 [86761]: https://github.com/rust-lang/rust/pull/86761
1679 [85746]: https://github.com/rust-lang/rust/pull/85746
1680 [85270]: https://github.com/rust-lang/rust/pull/85270
1681 [83918]: https://github.com/rust-lang/rust/pull/83918
1682 [79965]: https://github.com/rust-lang/rust/pull/79965
1683 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1684 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1685 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1686 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1687 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1688 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1689 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1690 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1691 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1692 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1693 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1694 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1695 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1696 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1697 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1698 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1699 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1700 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1701 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1702 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1703 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1704 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1707 Version 1.54.0 (2021-07-29)
1708 ============================
1711 -----------------------
1713 - [You can now use macros for values in some built-in attributes.][83366]
1714 This primarily allows you to call macros within the `#[doc]` attribute. For
1715 example, to include external documentation in your crate, you can now write
1718 #![doc = include_str!("README.md")]
1721 - [You can now cast between unsized slice types (and types which contain
1722 unsized slices) in `const fn`.][85078]
1723 - [You can now use multiple generic lifetimes with `impl Trait` where the
1724 lifetimes don't explicitly outlive another.][84701] In code this means
1725 that you can now have `impl Trait<'a, 'b>` where as before you could
1726 only have `impl Trait<'a, 'b> where 'b: 'a`.
1729 -----------------------
1731 - [Rustc will now search for custom JSON targets in
1732 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1733 directory.][83800] You can find your sysroot directory by running
1734 `rustc --print sysroot`.
1735 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1736 - [You can now use `#[target_feature]` on safe functions when targeting
1737 WebAssembly platforms.][84988]
1738 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1739 - [Added tier 3\* support for `bpfel-unknown-none`
1740 and `bpfeb-unknown-none`.][79608]
1741 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1743 \* Refer to Rust's [platform support page][platform-support-doc] for more
1744 information on Rust's tiered platform support.
1747 -----------------------
1749 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1750 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1751 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1752 - [The implementations of vendor intrinsics in core::arch have been
1753 significantly refactored.][83278] The main user-visible changes are
1754 a 50% reduction in the size of libcore.rlib and stricter validation
1755 of constant operands passed to intrinsics. The latter is technically
1756 a breaking change, but allows Rust to more closely match the C vendor
1762 - [`BTreeMap::into_keys`]
1763 - [`BTreeMap::into_values`]
1764 - [`HashMap::into_keys`]
1765 - [`HashMap::into_values`]
1767 - [`VecDeque::binary_search`]
1768 - [`VecDeque::binary_search_by`]
1769 - [`VecDeque::binary_search_by_key`]
1770 - [`VecDeque::partition_point`]
1775 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1776 the dependency graph.][cargo/9520]
1777 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1778 in the tree ][cargo/9499]
1779 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1780 macro dependencies.][cargo/9488]
1781 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1782 This variable points to a directory that integration tests and benches
1783 can use as a "scratchpad" for testing filesystem operations.
1787 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1788 - [Previously unsound code is no longer permitted where different constructors in branches
1789 could require different lifetimes.][85574]
1790 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1791 than before and may reject some previously accepted code.
1792 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1793 when compiled with `codegen-units = 1`.][86063]
1795 [85574]: https://github.com/rust-lang/rust/issues/85574
1796 [86831]: https://github.com/rust-lang/rust/issues/86831
1797 [86063]: https://github.com/rust-lang/rust/issues/86063
1798 [79608]: https://github.com/rust-lang/rust/pull/79608
1799 [84988]: https://github.com/rust-lang/rust/pull/84988
1800 [84701]: https://github.com/rust-lang/rust/pull/84701
1801 [84072]: https://github.com/rust-lang/rust/pull/84072
1802 [85745]: https://github.com/rust-lang/rust/pull/85745
1803 [84744]: https://github.com/rust-lang/rust/pull/84744
1804 [85078]: https://github.com/rust-lang/rust/pull/85078
1805 [84717]: https://github.com/rust-lang/rust/pull/84717
1806 [83800]: https://github.com/rust-lang/rust/pull/83800
1807 [83366]: https://github.com/rust-lang/rust/pull/83366
1808 [83278]: https://github.com/rust-lang/rust/pull/83278
1809 [85292]: https://github.com/rust-lang/rust/pull/85292
1810 [82834]: https://github.com/rust-lang/rust/pull/82834
1811 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1812 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1813 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1814 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1815 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1816 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1817 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1818 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1819 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1820 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1821 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1823 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1825 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1827 Version 1.53.0 (2021-06-17)
1828 ============================
1831 -----------------------
1832 - [You can now use unicode for identifiers.][83799] This allows multilingual
1833 identifiers but still doesn't allow glyphs that are not considered characters
1834 such as `◆` or `🦀`. More specifically you can now use any identifier that
1835 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1836 is the same standard as languages like Python, however Rust uses NFC
1837 normalization which may be different from other languages.
1838 - [You can now specify "or patterns" inside pattern matches.][79278]
1839 Previously you could only use `|` (OR) on complete patterns. E.g.
1843 matches!(x, Some(1) | Some(2));
1845 matches!(x, Some(1 | 2));
1847 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1848 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1849 to change semantics to being a pattern fragment in a future edition.
1852 -----------------------
1853 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1854 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1855 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1857 \* Refer to Rust's [platform support page][platform-support-doc] for more
1858 information on Rust's tiered platform support.
1861 -----------------------
1862 - [Abort messages will now forward to `android_set_abort_message` on
1863 Android platforms when available.][81469]
1864 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1865 - [Arrays of any length now implement `IntoIterator`.][84147]
1866 Currently calling `.into_iter()` as a method on an array will
1867 return `impl Iterator<Item=&T>`, but this may change in a
1868 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1869 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1870 - [`leading_zeros`, and `trailing_zeros` are now available on all
1871 `NonZero` integer types.][84082]
1872 - [`{f32, f64}::from_str` now parse and print special values
1873 (`NaN`, `-0`) according to IEEE 754.][78618]
1874 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1875 - [Add the `BITS` associated constant to all numeric types.][82565]
1879 - [`AtomicBool::fetch_update`]
1880 - [`AtomicPtr::fetch_update`]
1881 - [`BTreeMap::retain`]
1882 - [`BTreeSet::retain`]
1883 - [`BufReader::seek_relative`]
1884 - [`DebugStruct::non_exhaustive`]
1886 - [`Duration::ZERO`]
1887 - [`Duration::is_zero`]
1888 - [`Duration::saturating_add`]
1889 - [`Duration::saturating_mul`]
1890 - [`Duration::saturating_sub`]
1891 - [`ErrorKind::Unsupported`]
1892 - [`Option::insert`]
1893 - [`Ordering::is_eq`]
1894 - [`Ordering::is_ge`]
1895 - [`Ordering::is_gt`]
1896 - [`Ordering::is_le`]
1897 - [`Ordering::is_lt`]
1898 - [`Ordering::is_ne`]
1899 - [`OsStr::is_ascii`]
1900 - [`OsStr::make_ascii_lowercase`]
1901 - [`OsStr::make_ascii_uppercase`]
1902 - [`OsStr::to_ascii_lowercase`]
1903 - [`OsStr::to_ascii_uppercase`]
1904 - [`Peekable::peek_mut`]
1905 - [`Rc::decrement_strong_count`]
1906 - [`Rc::increment_strong_count`]
1907 - [`Vec::extend_from_within`]
1908 - [`array::from_mut`]
1909 - [`array::from_ref`]
1910 - [`cmp::max_by_key`]
1912 - [`cmp::min_by_key`]
1914 - [`f32::is_subnormal`]
1915 - [`f64::is_subnormal`]
1918 -----------------------
1919 - [Cargo now supports git repositories where the default `HEAD` branch is not
1920 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1921 which can handle default branches correctly.
1922 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1923 - [The `authors` field is no longer included in `Cargo.toml` for new
1924 projects.][cargo/9282]
1927 -----------------------
1928 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1929 without hyperlinks.][81764]
1933 - [Implement token-based handling of attributes during expansion][82608]
1934 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1935 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1936 to confusion and potential security vulnerabilities and [is no
1937 longer recommended][ietf6943].
1938 - [The added `BITS` constant may conflict with external definitions.][85667]
1939 In particular, this was known to be a problem in the `lexical-core` crate,
1940 but they have published fixes for semantic versions 0.4 through 0.7. To
1941 update this dependency alone, use `cargo update -p lexical-core`.
1942 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1946 These changes provide no direct user facing benefits, but represent significant
1947 improvements to the internals and overall performance of rustc and
1950 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1951 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1952 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1953 - [Rework rustdoc const type][82873]
1955 [85667]: https://github.com/rust-lang/rust/pull/85667
1956 [83386]: https://github.com/rust-lang/rust/pull/83386
1957 [82771]: https://github.com/rust-lang/rust/pull/82771
1958 [84147]: https://github.com/rust-lang/rust/pull/84147
1959 [84082]: https://github.com/rust-lang/rust/pull/84082
1960 [83799]: https://github.com/rust-lang/rust/pull/83799
1961 [83681]: https://github.com/rust-lang/rust/pull/83681
1962 [83652]: https://github.com/rust-lang/rust/pull/83652
1963 [83387]: https://github.com/rust-lang/rust/pull/83387
1964 [82873]: https://github.com/rust-lang/rust/pull/82873
1965 [82864]: https://github.com/rust-lang/rust/pull/82864
1966 [82608]: https://github.com/rust-lang/rust/pull/82608
1967 [82565]: https://github.com/rust-lang/rust/pull/82565
1968 [80525]: https://github.com/rust-lang/rust/pull/80525
1969 [79278]: https://github.com/rust-lang/rust/pull/79278
1970 [78618]: https://github.com/rust-lang/rust/pull/78618
1971 [77704]: https://github.com/rust-lang/rust/pull/77704
1972 [83941]: https://github.com/rust-lang/rust/pull/83941
1973 [83065]: https://github.com/rust-lang/rust/pull/83065
1974 [81764]: https://github.com/rust-lang/rust/pull/81764
1975 [81469]: https://github.com/rust-lang/rust/pull/81469
1976 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1977 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1978 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1979 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1980 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1981 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1982 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1983 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1984 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1985 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1986 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1987 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1988 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1989 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1990 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1991 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1992 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1993 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1994 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1995 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1996 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1997 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1998 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1999 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
2000 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
2001 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
2002 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
2003 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
2004 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
2005 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
2006 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
2007 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
2008 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
2009 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
2010 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
2011 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
2012 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
2013 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
2014 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
2015 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
2016 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
2019 Version 1.52.1 (2021-05-10)
2020 ============================
2022 This release disables incremental compilation, unless the user has explicitly
2023 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
2025 This is due to the widespread, and frequently occurring, breakage encountered by
2026 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
2027 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
2028 newly added incremental verification are still present in past stable versions,
2029 and are not yet fixed on any channel. These bugs can lead to miscompilation of
2032 These problems only affect incremental builds, so release builds with Cargo
2033 should not be affected unless the user has explicitly opted into incremental.
2034 Debug and check builds are affected.
2036 See [84970] for more details.
2038 [84970]: https://github.com/rust-lang/rust/issues/84970
2040 Version 1.52.0 (2021-05-06)
2041 ============================
2045 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
2046 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
2047 is allowed by default, and may become a warning or hard error in a
2049 - [You can now cast mutable references to arrays to a pointer of the same type as
2050 the element.][81479]
2054 - [Upgraded the default LLVM to LLVM 12.][81451]
2056 Added tier 3\* support for the following targets.
2058 - [`s390x-unknown-linux-musl`][82166]
2059 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
2060 - [`powerpc-unknown-openbsd`][82733]
2062 \* Refer to Rust's [platform support page][platform-support-doc] for more
2063 information on Rust's tiered platform support.
2067 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
2068 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
2069 - [`Arc<impl Error>` now implements `error::Error`.][80553]
2070 - [All integer division and remainder operations are now `const`.][80962]
2074 - [`Arguments::as_str`]
2076 - [`char::REPLACEMENT_CHARACTER`]
2077 - [`char::UNICODE_VERSION`]
2078 - [`char::decode_utf16`]
2079 - [`char::from_digit`]
2080 - [`char::from_u32_unchecked`]
2081 - [`char::from_u32`]
2082 - [`slice::partition_point`]
2083 - [`str::rsplit_once`]
2084 - [`str::split_once`]
2086 The following previously stable APIs are now `const`.
2088 - [`char::len_utf8`]
2089 - [`char::len_utf16`]
2090 - [`char::to_ascii_uppercase`]
2091 - [`char::to_ascii_lowercase`]
2092 - [`char::eq_ignore_ascii_case`]
2093 - [`u8::to_ascii_uppercase`]
2094 - [`u8::to_ascii_lowercase`]
2095 - [`u8::eq_ignore_ascii_case`]
2099 - [Rustdoc lints are now treated as a tool lint, meaning that
2100 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
2101 Using the old style is still allowed, and will become a warning in
2103 - [Rustdoc now supports argument files.][82261]
2104 - [Rustdoc now generates smart punctuation for documentation.][79423]
2105 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
2113 - [You can now pass multiple filters to tests.][81356] E.g.
2114 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
2115 - [Rustup now distributes PDB symbols for the `std` library on Windows,
2116 allowing you to see `std` symbols when debugging.][82218]
2120 These changes provide no direct user facing benefits, but represent significant
2121 improvements to the internals and overall performance of rustc and
2124 - [Check the result cache before the DepGraph when ensuring queries][81855]
2125 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
2126 - [Only store a LocalDefId in some HIR nodes][81611]
2127 - [Store HIR attributes in a side table][79519]
2131 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
2132 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
2133 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
2134 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
2135 languages in code blocks.][78429]
2136 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
2137 - [Changes in how proc macros handle whitespace may lead to panics when used
2138 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
2139 - [Turn `#[derive]` into a regular macro attribute][79078]
2141 [84136]: https://github.com/rust-lang/rust/issues/84136
2142 [80763]: https://github.com/rust-lang/rust/pull/80763
2143 [82166]: https://github.com/rust-lang/rust/pull/82166
2144 [82121]: https://github.com/rust-lang/rust/pull/82121
2145 [81879]: https://github.com/rust-lang/rust/pull/81879
2146 [82261]: https://github.com/rust-lang/rust/pull/82261
2147 [82218]: https://github.com/rust-lang/rust/pull/82218
2148 [82216]: https://github.com/rust-lang/rust/pull/82216
2149 [82202]: https://github.com/rust-lang/rust/pull/82202
2150 [81855]: https://github.com/rust-lang/rust/pull/81855
2151 [81766]: https://github.com/rust-lang/rust/pull/81766
2152 [81744]: https://github.com/rust-lang/rust/pull/81744
2153 [81611]: https://github.com/rust-lang/rust/pull/81611
2154 [81479]: https://github.com/rust-lang/rust/pull/81479
2155 [81451]: https://github.com/rust-lang/rust/pull/81451
2156 [81356]: https://github.com/rust-lang/rust/pull/81356
2157 [80962]: https://github.com/rust-lang/rust/pull/80962
2158 [80553]: https://github.com/rust-lang/rust/pull/80553
2159 [80527]: https://github.com/rust-lang/rust/pull/80527
2160 [79519]: https://github.com/rust-lang/rust/pull/79519
2161 [79423]: https://github.com/rust-lang/rust/pull/79423
2162 [79208]: https://github.com/rust-lang/rust/pull/79208
2163 [78429]: https://github.com/rust-lang/rust/pull/78429
2164 [82733]: https://github.com/rust-lang/rust/pull/82733
2165 [82594]: https://github.com/rust-lang/rust/pull/82594
2166 [79078]: https://github.com/rust-lang/rust/pull/79078
2167 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
2168 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
2169 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
2170 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
2171 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
2172 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
2173 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
2174 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
2175 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
2176 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
2177 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
2178 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
2179 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
2180 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
2181 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
2182 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
2183 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
2184 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
2185 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
2186 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
2187 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
2188 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
2190 Version 1.51.0 (2021-03-25)
2191 ============================
2195 - [You can now parameterize items such as functions, traits, and `struct`s by constant
2196 values in addition to by types and lifetimes.][79135] Also known as "const generics"
2197 E.g. you can now write the following. Note: Only values of primitive integers,
2198 `bool`, or `char` types are currently permitted.
2200 struct GenericArray<T, const LENGTH: usize> {
2204 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2205 const fn last(&self) -> Option<&T> {
2209 Some(&self.inner[LENGTH - 1])
2219 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2220 This option controls whether debug information is split across multiple files
2221 or packed into a single file. **Note** This option is unstable on other platforms.
2222 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2223 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2224 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2225 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2227 \* Refer to Rust's [platform support page][platform-support-doc] for more
2228 information on Rust's tiered platform support.
2233 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2234 - [`str` now implements `AsMut<str>`.][80279]
2235 - [`u64` and `u128` now implement `From<char>`.][79502]
2236 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2237 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2238 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2239 - [`io::Empty` now implements `io::Seek`.][78044]
2240 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2241 `T: ?Sized` types.][80764]
2242 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2248 - [`Arc::decrement_strong_count`]
2249 - [`Arc::increment_strong_count`]
2250 - [`Once::call_once_force`]
2251 - [`Peekable::next_if_eq`]
2252 - [`Peekable::next_if`]
2253 - [`Seek::stream_position`]
2254 - [`array::IntoIter`]
2255 - [`panic::panic_any`]
2257 - [`ptr::addr_of_mut!`]
2258 - [`slice::fill_with`]
2259 - [`slice::split_inclusive_mut`]
2260 - [`slice::split_inclusive`]
2261 - [`slice::strip_prefix`]
2262 - [`slice::strip_suffix`]
2263 - [`str::split_inclusive`]
2264 - [`sync::OnceState`]
2266 - [`VecDeque::range`]
2267 - [`VecDeque::range_mut`]
2271 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2272 codegen option.][cargo/9112]
2273 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2274 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2275 to avoid unifying features of dependencies where that unification could be unwanted.
2276 Such as using the same dependency with a `std` feature in a build scripts and
2277 proc-macros, while using the `no-std` feature in the final binary. See the
2278 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2283 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2284 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2285 documentation.][79642]
2287 Various improvements to intra-doc links:
2289 - [You can link to non-path primitives such as `slice`.][80181]
2290 - [You can link to associated items.][74489]
2291 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2295 - [You can now pass `--include-ignored` to tests (e.g. with
2296 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2301 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2302 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2304 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2305 for the distributed artifacts.][81521]
2306 - `armv5te-unknown-linux-gnueabi`
2307 - `sparc64-unknown-linux-gnu`
2308 - `thumbv7neon-unknown-linux-gnueabihf`
2309 - `armv7-unknown-linux-gnueabi`
2310 - `x86_64-unknown-linux-gnux32`
2311 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2316 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2318 [79135]: https://github.com/rust-lang/rust/pull/79135
2319 [74489]: https://github.com/rust-lang/rust/pull/74489
2320 [76934]: https://github.com/rust-lang/rust/pull/76934
2321 [79570]: https://github.com/rust-lang/rust/pull/79570
2322 [80181]: https://github.com/rust-lang/rust/pull/80181
2323 [79642]: https://github.com/rust-lang/rust/pull/79642
2324 [80945]: https://github.com/rust-lang/rust/pull/80945
2325 [80279]: https://github.com/rust-lang/rust/pull/80279
2326 [80053]: https://github.com/rust-lang/rust/pull/80053
2327 [79502]: https://github.com/rust-lang/rust/pull/79502
2328 [75180]: https://github.com/rust-lang/rust/pull/75180
2329 [81521]: https://github.com/rust-lang/rust/pull/81521
2330 [80968]: https://github.com/rust-lang/rust/pull/80968
2331 [80959]: https://github.com/rust-lang/rust/pull/80959
2332 [80718]: https://github.com/rust-lang/rust/pull/80718
2333 [80653]: https://github.com/rust-lang/rust/pull/80653
2334 [80579]: https://github.com/rust-lang/rust/pull/80579
2335 [79998]: https://github.com/rust-lang/rust/pull/79998
2336 [78044]: https://github.com/rust-lang/rust/pull/78044
2337 [81455]: https://github.com/rust-lang/rust/pull/81455
2338 [80764]: https://github.com/rust-lang/rust/pull/80764
2339 [80749]: https://github.com/rust-lang/rust/pull/80749
2340 [80662]: https://github.com/rust-lang/rust/pull/80662
2341 [79134]: https://github.com/rust-lang/rust/pull/79134
2342 [80966]: https://github.com/rust-lang/rust/pull/80966
2343 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2344 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2345 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2346 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2347 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2348 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2349 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2350 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2351 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2352 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2353 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2354 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2355 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2356 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2357 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2358 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2359 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2360 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2361 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2362 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2363 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2364 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2365 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2367 Version 1.50.0 (2021-02-11)
2368 ============================
2371 -----------------------
2372 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2373 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2374 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2377 -----------------------
2378 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2379 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2380 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2381 - [Dropped support for all cloudabi targets.][78439]
2383 \* Refer to Rust's [platform support page][platform-support-doc] for more
2384 information on Rust's tiered platform support.
2387 -----------------------
2389 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2390 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2391 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2392 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2393 up the same amount of space as `File`.
2399 - [`btree_map::Entry::or_insert_with_key`]
2402 - [`hash_map::Entry::or_insert_with_key`]
2406 - [`UnsafeCell::get_mut`]
2408 The following previously stable methods are now `const`.
2410 - [`IpAddr::is_ipv4`]
2411 - [`IpAddr::is_ipv6`]
2412 - [`IpAddr::is_unspecified`]
2413 - [`IpAddr::is_loopback`]
2414 - [`IpAddr::is_multicast`]
2415 - [`Ipv4Addr::octets`]
2416 - [`Ipv4Addr::is_loopback`]
2417 - [`Ipv4Addr::is_private`]
2418 - [`Ipv4Addr::is_link_local`]
2419 - [`Ipv4Addr::is_multicast`]
2420 - [`Ipv4Addr::is_broadcast`]
2421 - [`Ipv4Addr::is_documentation`]
2422 - [`Ipv4Addr::to_ipv6_compatible`]
2423 - [`Ipv4Addr::to_ipv6_mapped`]
2424 - [`Ipv6Addr::segments`]
2425 - [`Ipv6Addr::is_unspecified`]
2426 - [`Ipv6Addr::is_loopback`]
2427 - [`Ipv6Addr::is_multicast`]
2428 - [`Ipv6Addr::to_ipv4`]
2431 - [`Layout::from_size_align`]
2432 - `pow` for all integer types.
2433 - `checked_pow` for all integer types.
2434 - `saturating_pow` for all integer types.
2435 - `wrapping_pow` for all integer types.
2436 - `next_power_of_two` for all unsigned integer types.
2437 - `checked_next_power_of_two` for all unsigned integer types.
2440 -----------------------
2442 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2443 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2444 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2445 contents of that directory for changes.][cargo/8973]
2446 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2451 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2452 - [Running tests will now print the total time taken to execute.][75752]
2457 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2458 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2459 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2460 unhygenic `macro_rules!` macros.][79472]
2461 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2462 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2463 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2464 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2465 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2466 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2468 [74989]: https://github.com/rust-lang/rust/pull/74989
2469 [79261]: https://github.com/rust-lang/rust/pull/79261
2470 [79896]: https://github.com/rust-lang/rust/pull/79896
2471 [79484]: https://github.com/rust-lang/rust/pull/79484
2472 [79472]: https://github.com/rust-lang/rust/pull/79472
2473 [79270]: https://github.com/rust-lang/rust/pull/79270
2474 [79003]: https://github.com/rust-lang/rust/pull/79003
2475 [78864]: https://github.com/rust-lang/rust/pull/78864
2476 [78636]: https://github.com/rust-lang/rust/pull/78636
2477 [78439]: https://github.com/rust-lang/rust/pull/78439
2478 [78343]: https://github.com/rust-lang/rust/pull/78343
2479 [78296]: https://github.com/rust-lang/rust/pull/78296
2480 [78068]: https://github.com/rust-lang/rust/pull/78068
2481 [75752]: https://github.com/rust-lang/rust/pull/75752
2482 [74699]: https://github.com/rust-lang/rust/pull/74699
2483 [78142]: https://github.com/rust-lang/rust/pull/78142
2484 [77484]: https://github.com/rust-lang/rust/pull/77484
2485 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2486 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2487 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2488 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2489 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2490 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2491 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2492 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2493 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2494 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2495 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2496 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2497 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2498 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2499 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2500 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2501 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2502 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2503 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2504 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2505 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2506 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2507 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2508 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2509 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2510 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2511 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2512 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2513 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2514 [`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
2515 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2516 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2517 [`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
2518 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2521 Version 1.49.0 (2020-12-31)
2522 ============================
2525 -----------------------
2527 - [Unions can now implement `Drop`, and you can now have a field in a union
2528 with `ManuallyDrop<T>`.][77547]
2529 - [You can now cast uninhabited enums to integers.][76199]
2530 - [You can now bind by reference and by move in patterns.][76119] This
2531 allows you to selectively borrow individual components of a type. E.g.
2539 let person = Person {
2540 name: String::from("Alice"),
2544 // `name` is moved out of person, but `age` is referenced.
2545 let Person { name, ref age } = person;
2546 println!("{} {}", name, age);
2550 -----------------------
2552 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2553 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2554 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2555 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2556 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2557 - [Output from threads spawned in tests is now captured.][78227]
2558 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2560 \* Refer to Rust's [platform support page][platform-support-doc] for more
2561 information on Rust's tiered platform support.
2564 -----------------------
2566 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2567 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2572 - [`slice::select_nth_unstable`]
2573 - [`slice::select_nth_unstable_by`]
2574 - [`slice::select_nth_unstable_by_key`]
2576 The following previously stable methods are now `const`.
2578 - [`Poll::is_ready`]
2579 - [`Poll::is_pending`]
2582 -----------------------
2583 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2584 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2585 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2586 variable will be set if the crate being built is one the user selected to build, either
2587 with `-p` or through defaults.
2588 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2594 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2595 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2596 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2597 Previously such invalid or unused attributes could be ignored.
2598 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2599 read [this post about the changes][rustdoc-ws-post] for more details.
2600 - [Trait bounds are no longer inferred for associated types.][79904]
2604 These changes provide no direct user facing benefits, but represent significant
2605 improvements to the internals and overall performance of rustc and
2608 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2609 Local Storage model.][78201]
2610 - [Calculate visibilities once in resolve.][78077]
2611 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2612 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2615 [75991]: https://github.com/rust-lang/rust/pull/75991
2616 [78951]: https://github.com/rust-lang/rust/pull/78951
2617 [78848]: https://github.com/rust-lang/rust/pull/78848
2618 [78746]: https://github.com/rust-lang/rust/pull/78746
2619 [78376]: https://github.com/rust-lang/rust/pull/78376
2620 [78228]: https://github.com/rust-lang/rust/pull/78228
2621 [78227]: https://github.com/rust-lang/rust/pull/78227
2622 [78201]: https://github.com/rust-lang/rust/pull/78201
2623 [78109]: https://github.com/rust-lang/rust/pull/78109
2624 [78077]: https://github.com/rust-lang/rust/pull/78077
2625 [77997]: https://github.com/rust-lang/rust/pull/77997
2626 [77703]: https://github.com/rust-lang/rust/pull/77703
2627 [77547]: https://github.com/rust-lang/rust/pull/77547
2628 [77015]: https://github.com/rust-lang/rust/pull/77015
2629 [76199]: https://github.com/rust-lang/rust/pull/76199
2630 [76119]: https://github.com/rust-lang/rust/pull/76119
2631 [75914]: https://github.com/rust-lang/rust/pull/75914
2632 [79004]: https://github.com/rust-lang/rust/pull/79004
2633 [78676]: https://github.com/rust-lang/rust/pull/78676
2634 [79904]: https://github.com/rust-lang/rust/issues/79904
2635 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2636 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2637 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2638 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2639 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2640 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2641 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2642 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2643 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2644 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2646 Version 1.48.0 (2020-11-19)
2647 ==========================
2652 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2653 is still rejected *semantically*, but can now be parsed by procedural macros.
2657 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2658 `rustc` whether to link its own C runtime and libraries or to rely on a external
2659 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2660 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2661 Note: If you're using cargo you must explicitly pass the `--target` flag.
2662 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2664 \* Refer to Rust's [platform support page][platform-support-doc] for more
2665 information on Rust's tiered platform support.
2669 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2670 and `&Stderr`.][76275]
2671 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2672 - [The `matches!` macro now supports having a trailing comma.][74880]
2673 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2674 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2678 - [`slice::as_ptr_range`]
2679 - [`slice::as_mut_ptr_range`]
2680 - [`VecDeque::make_contiguous`]
2681 - [`future::pending`]
2684 The following previously stable methods are now `const fn`'s:
2686 - [`Option::is_some`]
2687 - [`Option::is_none`]
2688 - [`Option::as_ref`]
2690 - [`Result::is_err`]
2691 - [`Result::as_ref`]
2692 - [`Ordering::reverse`]
2693 - [`Ordering::then`]
2700 - [You can now link to items in `rustdoc` using the intra-doc link
2701 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2702 a link to `std::future`'s documentation. See ["Linking to items by
2703 name"][intradoc-links] for more information.
2704 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2705 when searching through `rustdoc`'s UI.][75740]
2709 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2710 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2711 promoted to `'static` lifetime any more inside `const fn`s.
2712 - [Associated type bindings on trait objects are now verified to meet the bounds
2713 declared on the trait when checking that they implement the trait.][27675]
2714 - [When trait bounds on associated types or opaque types are ambiguous, the
2715 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2716 - [Fixed recursive nonterminals not being expanded in macros during
2717 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2718 correctly handling recursive nonterminal tokens.
2719 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2720 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2721 in places where they have no effect.][73461]
2722 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2723 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2724 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2725 disallow zero-initialization.][71274]
2726 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2727 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2728 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2729 see the [`catch_unwind`] documentation for further information.
2735 These changes provide no direct user facing benefits, but represent significant
2736 improvements to the internals and overall performance of rustc and
2739 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2740 You can continue building with `make` by setting `ninja=false` in
2742 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2743 - [Made `ensure_sufficient_stack()` non-generic][76680]
2745 [78143]: https://github.com/rust-lang/rust/issues/78143
2746 [76680]: https://github.com/rust-lang/rust/pull/76680/
2747 [76030]: https://github.com/rust-lang/rust/pull/76030/
2748 [70212]: https://github.com/rust-lang/rust/pull/70212/
2749 [27675]: https://github.com/rust-lang/rust/issues/27675/
2750 [54121]: https://github.com/rust-lang/rust/issues/54121/
2751 [71274]: https://github.com/rust-lang/rust/pull/71274/
2752 [77386]: https://github.com/rust-lang/rust/pull/77386/
2753 [77153]: https://github.com/rust-lang/rust/pull/77153/
2754 [77055]: https://github.com/rust-lang/rust/pull/77055/
2755 [76275]: https://github.com/rust-lang/rust/pull/76275/
2756 [76310]: https://github.com/rust-lang/rust/pull/76310/
2757 [76420]: https://github.com/rust-lang/rust/pull/76420/
2758 [76158]: https://github.com/rust-lang/rust/pull/76158/
2759 [75857]: https://github.com/rust-lang/rust/pull/75857/
2760 [75585]: https://github.com/rust-lang/rust/pull/75585/
2761 [75740]: https://github.com/rust-lang/rust/pull/75740/
2762 [75502]: https://github.com/rust-lang/rust/pull/75502/
2763 [74880]: https://github.com/rust-lang/rust/pull/74880/
2764 [74922]: https://github.com/rust-lang/rust/pull/74922/
2765 [74430]: https://github.com/rust-lang/rust/pull/74430/
2766 [74194]: https://github.com/rust-lang/rust/pull/74194/
2767 [73461]: https://github.com/rust-lang/rust/pull/73461/
2768 [73166]: https://github.com/rust-lang/rust/pull/73166/
2769 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2770 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2771 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2772 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2773 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2774 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2775 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2776 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2777 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2778 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2779 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2780 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2781 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2782 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2783 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2786 Version 1.47.0 (2020-10-08)
2787 ==========================
2791 - [Closures will now warn when not used.][74869]
2795 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2796 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2798 - [Upgraded to LLVM 11.][73526]
2799 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2800 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2801 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2803 \* Refer to Rust's [platform support page][platform-support-doc] for more
2804 information on Rust's tiered platform support.
2808 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2809 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2810 those of length less than 33.][74060]
2811 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2812 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2813 `PartialEq`, and `PartialOrd`.][73583]
2817 - [`Ident::new_raw`]
2818 - [`Range::is_empty`]
2819 - [`RangeInclusive::is_empty`]
2820 - [`Result::as_deref`]
2821 - [`Result::as_deref_mut`]
2823 - [`pointer::offset_from`]
2827 The following previously stable APIs have now been made const.
2829 - [The `new` method for all `NonZero` integers.][73858]
2830 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2831 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2832 methods for all integers.][73858]
2833 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2834 signed integers.][73858]
2835 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2836 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2837 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2838 `is_ascii_control` methods for `char` and `u8`.][73858]
2842 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2843 You can override this by setting the following in your `Cargo.toml`.
2845 [profile.release.build-override]
2848 - [`cargo-help` will now display man pages for commands rather just the
2849 `--help` text.][cargo/8456]
2850 - [`cargo-metadata` now emits a `test` field indicating if a target has
2851 tests enabled.][cargo/8478]
2852 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2853 - [`cargo-publish` will now use an alternative registry by default if it's the
2854 only registry specified in `package.publish`.][cargo/8571]
2858 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2859 type based search.][75366]
2860 - [Added the Ayu theme to rustdoc.][71237]
2864 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2865 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2866 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2867 help to preserve more span information.][73084] These changes may cause
2868 compilation errors if your macro was unhygenic or didn't correctly handle
2870 - [Moved support for the CloudABI target to tier 3.][75568]
2871 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2872 - [Added the `rustc-docs` component.][75560] This allows you to install
2873 and read the documentation for the compiler internal APIs. (Currently only
2874 available for `x86_64-unknown-linux-gnu`.)
2879 - [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.
2881 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2882 [75048]: https://github.com/rust-lang/rust/pull/75048/
2883 [74163]: https://github.com/rust-lang/rust/pull/74163/
2884 [71237]: https://github.com/rust-lang/rust/pull/71237/
2885 [74869]: https://github.com/rust-lang/rust/pull/74869/
2886 [73858]: https://github.com/rust-lang/rust/pull/73858/
2887 [75716]: https://github.com/rust-lang/rust/pull/75716/
2888 [75560]: https://github.com/rust-lang/rust/pull/75560/
2889 [75568]: https://github.com/rust-lang/rust/pull/75568/
2890 [75366]: https://github.com/rust-lang/rust/pull/75366/
2891 [75204]: https://github.com/rust-lang/rust/pull/75204/
2892 [74650]: https://github.com/rust-lang/rust/pull/74650/
2893 [74419]: https://github.com/rust-lang/rust/pull/74419/
2894 [73964]: https://github.com/rust-lang/rust/pull/73964/
2895 [74021]: https://github.com/rust-lang/rust/pull/74021/
2896 [74060]: https://github.com/rust-lang/rust/pull/74060/
2897 [73893]: https://github.com/rust-lang/rust/pull/73893/
2898 [73526]: https://github.com/rust-lang/rust/pull/73526/
2899 [73583]: https://github.com/rust-lang/rust/pull/73583/
2900 [73084]: https://github.com/rust-lang/rust/pull/73084/
2901 [73197]: https://github.com/rust-lang/rust/pull/73197/
2902 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2903 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2904 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2905 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2906 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2907 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2908 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2909 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2910 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2911 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2912 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2913 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2914 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2915 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2918 Version 1.46.0 (2020-08-27)
2919 ==========================
2923 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2924 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2925 const functions.][73862]
2926 - [The `#[track_caller]` attribute can now be added to functions to use the
2927 function's caller's location information for panic messages.][72445]
2928 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2929 `x.0.0` over `(x.0).0`.
2930 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2931 You currently can't use `mem::transmute` in constant functions.
2935 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2936 - [Enabled static "Position Independent Executables" by default
2937 for `x86_64-unknown-linux-musl`.][70740]
2941 - [`mem::forget` is now a `const fn`.][73887]
2942 - [`String` now implements `From<char>`.][73466]
2943 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2944 integer types.][73032]
2945 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2946 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2947 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2948 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2949 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2950 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2955 - [`vec::Drain::as_slice`]
2959 Added a number of new environment variables that are now available when
2960 compiling your crate.
2962 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2963 the specific binary being compiled and the name of the crate.
2964 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2965 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2969 - [The target configuration option `abi_blacklist` has been renamed
2970 to `unsupported_abis`.][74150] The old name will still continue to work.
2971 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2972 This was previously accepted but will become a hard error in a future release.
2973 - [Rustc will fail to compile if you have a struct with
2974 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2976 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2977 ensure that spans have the correct information, and may cause breakage if you
2978 were relying on receiving spans with dummy information.
2979 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2980 a legacy installer that was replaced by a MSI installer a few years ago but
2981 was still being built.
2982 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2983 - [Rustc will no longer accept overlapping trait implementations that only
2984 differ in how the lifetime was bound.][72493]
2985 - [Rustc now correctly relates the lifetime of an existential associated
2986 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2987 you to pass a shorter lifetime than expected.
2988 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2989 The library will need to be installed for `rustc` to work, even though we
2990 expect it to be already available on most systems.
2991 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2993 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2994 exact output returned by rustc's pretty printing is an unstable
2995 implementation detail: we recommend any macro relying on it to switch to a
2996 more robust parsing system.
2998 [75453]: https://github.com/rust-lang/rust/issues/75453/
2999 [74820]: https://github.com/rust-lang/rust/issues/74820/
3000 [74420]: https://github.com/rust-lang/rust/issues/74420/
3001 [74109]: https://github.com/rust-lang/rust/pull/74109/
3002 [74150]: https://github.com/rust-lang/rust/pull/74150/
3003 [73862]: https://github.com/rust-lang/rust/pull/73862/
3004 [73887]: https://github.com/rust-lang/rust/pull/73887/
3005 [73466]: https://github.com/rust-lang/rust/pull/73466/
3006 [73516]: https://github.com/rust-lang/rust/pull/73516/
3007 [73293]: https://github.com/rust-lang/rust/pull/73293/
3008 [73007]: https://github.com/rust-lang/rust/pull/73007/
3009 [73032]: https://github.com/rust-lang/rust/pull/73032/
3010 [72920]: https://github.com/rust-lang/rust/pull/72920/
3011 [72569]: https://github.com/rust-lang/rust/pull/72569/
3012 [72583]: https://github.com/rust-lang/rust/pull/72583/
3013 [72584]: https://github.com/rust-lang/rust/pull/72584/
3014 [72717]: https://github.com/rust-lang/rust/pull/72717/
3015 [72437]: https://github.com/rust-lang/rust/pull/72437/
3016 [72445]: https://github.com/rust-lang/rust/pull/72445/
3017 [72486]: https://github.com/rust-lang/rust/pull/72486/
3018 [72493]: https://github.com/rust-lang/rust/pull/72493/
3019 [72331]: https://github.com/rust-lang/rust/pull/72331/
3020 [71896]: https://github.com/rust-lang/rust/pull/71896/
3021 [71660]: https://github.com/rust-lang/rust/pull/71660/
3022 [71322]: https://github.com/rust-lang/rust/pull/71322/
3023 [70740]: https://github.com/rust-lang/rust/pull/70740/
3024 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
3025 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
3026 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
3027 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
3028 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
3031 Version 1.45.2 (2020-08-03)
3032 ==========================
3034 * [Fix bindings in tuple struct patterns][74954]
3035 * [Fix track_caller integration with trait objects][74784]
3037 [74954]: https://github.com/rust-lang/rust/issues/74954
3038 [74784]: https://github.com/rust-lang/rust/issues/74784
3041 Version 1.45.1 (2020-07-30)
3042 ==========================
3044 * [Fix const propagation with references.][73613]
3045 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3046 * [Avoid spurious implicit region bound.][74509]
3047 * [Install clippy on x.py install][74457]
3049 [73613]: https://github.com/rust-lang/rust/pull/73613
3050 [73078]: https://github.com/rust-lang/rust/issues/73078
3051 [74509]: https://github.com/rust-lang/rust/pull/74509
3052 [74457]: https://github.com/rust-lang/rust/pull/74457
3055 Version 1.45.0 (2020-07-16)
3056 ==========================
3060 - [Out of range float to int conversions using `as` has been defined as a saturating
3061 conversion.][71269] This was previously undefined behaviour, but you can use the
3062 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
3063 may be desirable in rare performance sensitive situations.
3064 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
3065 using `u64`.][70705]
3066 - [Function like procedural macros can now be used in expression, pattern, and statement
3067 positions.][68717] This means you can now use a function-like procedural macro
3068 anywhere you can use a declarative (`macro_rules!`) macro.
3072 - [You can now override individual target features through the `target-feature`
3073 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
3074 equivalent to `-C target-feature=+avx2,+fma`.
3075 - [Added the `force-unwind-tables` flag.][69984] This option allows
3076 rustc to always generate unwind tables regardless of panic strategy.
3077 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
3078 to include LLVM bitcode into generated `rlib`s (this is on by default).
3079 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
3080 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
3081 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
3082 - [Upgraded to LLVM 10.][67759]
3084 \* Refer to Rust's [platform support page][platform-support-doc] for more
3085 information on Rust's tiered platform support.
3090 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
3092 - [`proc_macro::TokenStream` now implements `Default`.][72234]
3093 - [You can now use `char` with
3094 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
3095 a range of codepoints.][72413] E.g.
3096 you can now write the following;
3098 for ch in 'a'..='z' {
3102 // Prints "abcdefghijklmnopqrstuvwxyz"
3104 - [`OsString` now implements `FromStr`.][71662]
3105 - [The `saturating_neg` method has been added to all signed integer primitive
3106 types, and the `saturating_abs` method has been added for all integer
3107 primitive types.][71886]
3108 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
3109 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
3111 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
3112 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
3113 integer types.][69813]
3114 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
3115 integer types.][72324]
3116 - [The `fetch_update` method has been added to all atomic integer types.][71843]
3121 - [`BTreeMap::remove_entry`]
3123 - [`rc::Weak::as_ptr`]
3124 - [`rc::Weak::from_raw`]
3125 - [`rc::Weak::into_raw`]
3126 - [`str::strip_prefix`]
3127 - [`str::strip_suffix`]
3128 - [`sync::Weak::as_ptr`]
3129 - [`sync::Weak::from_raw`]
3130 - [`sync::Weak::into_raw`]
3131 - [`char::UNICODE_VERSION`]
3132 - [`Span::resolved_at`]
3133 - [`Span::located_at`]
3134 - [`Span::mixed_site`]
3135 - [`unix::process::CommandExt::arg0`]
3140 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
3145 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
3146 `~~outdated information~~` becomes "~~outdated information~~".
3147 - [Added an emoji to Rustdoc's deprecated API message.][72014]
3151 - [Trying to self initialize a static value (that is creating a value using
3152 itself) is unsound and now causes a compile error.][71140]
3153 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
3154 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
3155 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
3156 previously undocumented and not intended for public use. Rustdoc still provides
3157 a non-zero exit code on errors.
3158 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
3159 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
3160 flags while cargo is adding `embed-bitcode` itself. The recommended way to
3161 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
3162 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
3166 - [Make clippy a git subtree instead of a git submodule][70655]
3167 - [Unify the undo log of all snapshot types][69464]
3169 [71848]: https://github.com/rust-lang/rust/issues/71848/
3170 [73420]: https://github.com/rust-lang/rust/issues/73420/
3171 [72324]: https://github.com/rust-lang/rust/pull/72324/
3172 [71843]: https://github.com/rust-lang/rust/pull/71843/
3173 [71886]: https://github.com/rust-lang/rust/pull/71886/
3174 [72234]: https://github.com/rust-lang/rust/pull/72234/
3175 [72239]: https://github.com/rust-lang/rust/pull/72239/
3176 [72397]: https://github.com/rust-lang/rust/pull/72397/
3177 [72413]: https://github.com/rust-lang/rust/pull/72413/
3178 [72014]: https://github.com/rust-lang/rust/pull/72014/
3179 [72062]: https://github.com/rust-lang/rust/pull/72062/
3180 [72094]: https://github.com/rust-lang/rust/pull/72094/
3181 [72133]: https://github.com/rust-lang/rust/pull/72133/
3182 [67759]: https://github.com/rust-lang/rust/pull/67759/
3183 [71900]: https://github.com/rust-lang/rust/pull/71900/
3184 [71928]: https://github.com/rust-lang/rust/pull/71928/
3185 [71662]: https://github.com/rust-lang/rust/pull/71662/
3186 [71716]: https://github.com/rust-lang/rust/pull/71716/
3187 [71447]: https://github.com/rust-lang/rust/pull/71447/
3188 [71269]: https://github.com/rust-lang/rust/pull/71269/
3189 [71095]: https://github.com/rust-lang/rust/pull/71095/
3190 [71140]: https://github.com/rust-lang/rust/pull/71140/
3191 [70655]: https://github.com/rust-lang/rust/pull/70655/
3192 [70705]: https://github.com/rust-lang/rust/pull/70705/
3193 [69984]: https://github.com/rust-lang/rust/pull/69984/
3194 [69813]: https://github.com/rust-lang/rust/pull/69813/
3195 [69464]: https://github.com/rust-lang/rust/pull/69464/
3196 [68717]: https://github.com/rust-lang/rust/pull/68717/
3197 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
3198 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
3199 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
3200 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
3201 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3202 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3203 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3204 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3205 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3206 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3207 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3208 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3209 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3210 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3211 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3212 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3213 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3216 Version 1.44.1 (2020-06-18)
3217 ===========================
3219 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3220 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3221 * [Fix crashes when finding backtrace on macOS.][71397]
3222 * [Clippy applies lint levels into different files.][clippy/5356]
3224 [71397]: https://github.com/rust-lang/rust/issues/71397
3225 [73078]: https://github.com/rust-lang/rust/issues/73078
3226 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3227 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3230 Version 1.44.0 (2020-06-04)
3231 ==========================
3235 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3236 - [Added the `unused_braces` lint.][70081]
3238 **Syntax-only changes**
3240 - [Expansion-driven outline module parsing][69838]
3245 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3250 These are still rejected semantically, so you will likely receive an error but
3251 these changes can be seen and parsed by macros and conditional compilation.
3255 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3256 Additionally when in incremental mode rustc defaults to 256 codegen units.
3257 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3258 a panic is thrown.][67502]
3259 - [Added tier 3\* support for the `aarch64-unknown-none` and
3260 `aarch64-unknown-none-softfloat` targets.][68334]
3261 - [Added tier 3 support for `arm64-apple-tvos` and
3262 `x86_64-apple-tvos` targets.][68191]
3267 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3268 `vec![]` to be able to be used in `const` contexts.
3269 - [`convert::Infallible` now implements `Hash`.][70281]
3270 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3271 a `&mut OsStr`.][70048]
3272 - [Unicode 13 is now supported.][69929]
3273 - [`String` now implements `From<&mut str>`.][69661]
3274 - [`IoSlice` now implements `Copy`.][69403]
3275 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3276 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3277 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3278 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3279 integer types.][69373]
3283 - [`PathBuf::with_capacity`]
3284 - [`PathBuf::capacity`]
3285 - [`PathBuf::clear`]
3286 - [`PathBuf::reserve`]
3287 - [`PathBuf::reserve_exact`]
3288 - [`PathBuf::shrink_to_fit`]
3289 - [`f32::to_int_unchecked`]
3290 - [`f64::to_int_unchecked`]
3291 - [`Layout::align_to`]
3292 - [`Layout::pad_to_align`]
3294 - [`Layout::extend`]
3298 - [Added the `cargo tree` command which will print a tree graph of
3299 your dependencies.][cargo/8062] E.g.
3301 mdbook v0.3.2 (/Users/src/rust/mdbook)
3303 │ ├── html5ever v0.24.0
3305 │ │ │ └── cfg-if v0.1.9
3307 │ │ └── markup5ever v0.9.0
3308 │ │ ├── log v0.4.8 (*)
3310 │ │ │ └── phf_shared v0.7.24
3311 │ │ │ ├── siphasher v0.2.3
3312 │ │ │ └── unicase v1.4.2
3313 │ │ │ [build-dependencies]
3314 │ │ │ └── version_check v0.1.5
3317 You can also display dependencies on multiple versions of the same crate with
3318 `cargo tree -d` (short for `cargo tree --duplicates`).
3322 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3323 the version in the sidebar.][69494]
3327 - [Rustc now correctly generates static libraries on Windows GNU targets with
3328 the `.a` extension, rather than the previous `.lib`.][70937]
3329 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3330 - [The `file_name` property in JSON output of macro errors now points the actual
3331 source file rather than the previous format of `<NAME macros>`.][70969]
3332 **Note:** this may not point to a file that actually exists on the user's system.
3333 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3334 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3335 not allow zero initialization such as `NonZeroU8`.][66059] This was
3336 previously a warning.
3337 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3338 operator has been defined as a saturating operation.][71269] This was previously
3339 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3340 continue using the current behaviour, which may be desirable in rare performance
3341 sensitive situations.
3345 These changes provide no direct user facing benefits, but represent significant
3346 improvements to the internals and overall performance of rustc and
3349 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3350 - [Replace big JS dict with JSON parsing.][71250]
3352 [69373]: https://github.com/rust-lang/rust/pull/69373/
3353 [66059]: https://github.com/rust-lang/rust/pull/66059/
3354 [68191]: https://github.com/rust-lang/rust/pull/68191/
3355 [68899]: https://github.com/rust-lang/rust/pull/68899/
3356 [71147]: https://github.com/rust-lang/rust/pull/71147/
3357 [71250]: https://github.com/rust-lang/rust/pull/71250/
3358 [70937]: https://github.com/rust-lang/rust/pull/70937/
3359 [70969]: https://github.com/rust-lang/rust/pull/70969/
3360 [70632]: https://github.com/rust-lang/rust/pull/70632/
3361 [70281]: https://github.com/rust-lang/rust/pull/70281/
3362 [70345]: https://github.com/rust-lang/rust/pull/70345/
3363 [70048]: https://github.com/rust-lang/rust/pull/70048/
3364 [70081]: https://github.com/rust-lang/rust/pull/70081/
3365 [70156]: https://github.com/rust-lang/rust/pull/70156/
3366 [71269]: https://github.com/rust-lang/rust/pull/71269/
3367 [69838]: https://github.com/rust-lang/rust/pull/69838/
3368 [69929]: https://github.com/rust-lang/rust/pull/69929/
3369 [69661]: https://github.com/rust-lang/rust/pull/69661/
3370 [69778]: https://github.com/rust-lang/rust/pull/69778/
3371 [69494]: https://github.com/rust-lang/rust/pull/69494/
3372 [69403]: https://github.com/rust-lang/rust/pull/69403/
3373 [69033]: https://github.com/rust-lang/rust/pull/69033/
3374 [68692]: https://github.com/rust-lang/rust/pull/68692/
3375 [68334]: https://github.com/rust-lang/rust/pull/68334/
3376 [67502]: https://github.com/rust-lang/rust/pull/67502/
3377 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3378 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3379 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3380 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3381 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3382 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3383 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3384 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3385 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3386 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3387 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3388 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3389 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3392 Version 1.43.1 (2020-05-07)
3393 ===========================
3395 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3396 * [Fixed the stabilization of AVX-512 features.][71473]
3397 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3399 [71430]: https://github.com/rust-lang/rust/pull/71430
3400 [71473]: https://github.com/rust-lang/rust/issues/71473
3401 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3404 Version 1.43.0 (2020-04-23)
3405 ==========================
3409 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3410 the type inferred correctly.][68129]
3411 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3413 **Syntax only changes**
3414 - [Allow `type Foo: Ord` syntactically.][69361]
3415 - [Fuse associated and extern items up to defaultness.][69194]
3416 - [Syntactically allow `self` in all `fn` contexts.][68764]
3417 - [Merge `fn` syntax + cleanup item parsing.][68728]
3418 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3419 For example, you may now write:
3421 macro_rules! mac_trait {
3431 These are still rejected *semantically*, so you will likely receive an error but
3432 these changes can be seen and parsed by macros and
3433 conditional compilation.
3438 - [You can now pass multiple lint flags to rustc to override the previous
3439 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3440 everything in the `unused` lint group except `unused-variables` which
3441 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3442 everything in the `unused` lint group **including** `unused-variables` since
3443 the allow flag is specified before the deny flag (and therefore overridden).
3444 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3445 if they are available on `windows-gnu`.][67429]
3446 - [rustc now buffers errors/warnings printed in JSON.][69227]
3450 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3451 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3452 respectively.][69538] **Note** These conversions are only available when `N`
3454 - [You can now use associated constants on floats and integers directly, rather
3455 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3456 `f32::NAN` with no imports.
3457 - [`u8::is_ascii` is now `const`.][68984]
3458 - [`String` now implements `AsMut<str>`.][68742]
3459 - [Added the `primitive` module to `std` and `core`.][67637] This module
3460 reexports Rust's primitive types. This is mainly useful in macros
3461 where you want avoid these types being shadowed.
3462 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3463 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3467 - [`Once::is_completed`]
3472 - [`iter::once_with`]
3476 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3477 your environment.][cargo/7823]
3478 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3479 executable path when running integration tests or benchmarks.][cargo/7697]
3480 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3481 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3485 - [Certain checks in the `const_err` lint were deemed unrelated to const
3486 evaluation][69185], and have been moved to the `unconditional_panic` and
3487 `arithmetic_overflow` lints.
3492 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3493 has been a warning since 1.36.0.
3494 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3495 led to some instances being accepted, and now correctly emits a hard error.
3497 [69340]: https://github.com/rust-lang/rust/pull/69340
3501 These changes provide no direct user facing benefits, but represent significant
3502 improvements to the internals and overall performance of `rustc` and
3505 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3506 - [Improved how rustc generates drop code.][67332]
3507 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3508 - [traits: preallocate 2 Vecs of known initial size][69022]
3509 - [Avoid exponential behaviour when relating types][68772]
3510 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3511 - [Improve performance of coherence checks][68966]
3512 - [Deduplicate types in the generator witness][68672]
3513 - [Invert control in struct_lint_level.][68725]
3515 [67332]: https://github.com/rust-lang/rust/pull/67332/
3516 [67429]: https://github.com/rust-lang/rust/pull/67429/
3517 [67637]: https://github.com/rust-lang/rust/pull/67637/
3518 [67642]: https://github.com/rust-lang/rust/pull/67642/
3519 [67878]: https://github.com/rust-lang/rust/pull/67878/
3520 [67885]: https://github.com/rust-lang/rust/pull/67885/
3521 [68129]: https://github.com/rust-lang/rust/pull/68129/
3522 [68672]: https://github.com/rust-lang/rust/pull/68672/
3523 [68725]: https://github.com/rust-lang/rust/pull/68725/
3524 [68728]: https://github.com/rust-lang/rust/pull/68728/
3525 [68738]: https://github.com/rust-lang/rust/pull/68738/
3526 [68742]: https://github.com/rust-lang/rust/pull/68742/
3527 [68764]: https://github.com/rust-lang/rust/pull/68764/
3528 [68772]: https://github.com/rust-lang/rust/pull/68772/
3529 [68943]: https://github.com/rust-lang/rust/pull/68943/
3530 [68952]: https://github.com/rust-lang/rust/pull/68952/
3531 [68966]: https://github.com/rust-lang/rust/pull/68966/
3532 [68984]: https://github.com/rust-lang/rust/pull/68984/
3533 [69022]: https://github.com/rust-lang/rust/pull/69022/
3534 [69185]: https://github.com/rust-lang/rust/pull/69185/
3535 [69194]: https://github.com/rust-lang/rust/pull/69194/
3536 [69201]: https://github.com/rust-lang/rust/pull/69201/
3537 [69227]: https://github.com/rust-lang/rust/pull/69227/
3538 [69548]: https://github.com/rust-lang/rust/pull/69548/
3539 [69256]: https://github.com/rust-lang/rust/pull/69256/
3540 [69361]: https://github.com/rust-lang/rust/pull/69361/
3541 [69366]: https://github.com/rust-lang/rust/pull/69366/
3542 [69538]: https://github.com/rust-lang/rust/pull/69538/
3543 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3544 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3545 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3546 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3547 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3548 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3549 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3550 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3553 Version 1.42.0 (2020-03-12)
3554 ==========================
3558 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3560 fn foo(words: &[&str]) {
3562 ["Hello", "World", "!", ..] => println!("Hello World!"),
3563 ["Foo", "Bar", ..] => println!("Baz"),
3564 rest => println!("{:?}", rest),
3568 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3569 that you can create an enum that has the exact layout and ABI of the type
3571 - [You can now use outer attribute procedural macros on inline modules.][64273]
3572 - [There are some *syntax-only* changes:][67131]
3573 - `default` is syntactically allowed before items in `trait` definitions.
3574 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3575 leave out their bodies in favor of `;`.
3576 - Bounds on associated types in `impl`s are now syntactically allowed
3577 (e.g. `type Foo: Ord;`).
3578 - `...` (the C-variadic type) may occur syntactically directly as the type of
3579 any function parameter.
3581 These are still rejected *semantically*, so you will likely receive an error
3582 but these changes can be seen and parsed by procedural macros and
3583 conditional compilation.
3587 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3588 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3589 - [`Option::{expect,unwrap}` and
3590 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3591 pointing to the location where they were called, rather than
3592 `core`'s internals. ][67887]
3594 \* Refer to Rust's [platform support page][platform-support-doc] for more
3595 information on Rust's tiered platform support.
3599 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3600 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3601 to implement `Sized`.][67935]
3602 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3603 - [`Layout::new` is now `const`.][66254]
3604 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3609 - [`CondVar::wait_while`]
3610 - [`CondVar::wait_timeout_while`]
3612 - [`DebugMap::value`]
3613 - [`ManuallyDrop::take`]
3615 - [`ptr::slice_from_raw_parts_mut`]
3616 - [`ptr::slice_from_raw_parts`]
3620 - [You no longer need to include `extern crate proc_macro;` to be able to
3621 `use proc_macro;` in the `2018` edition.][cargo/7700]
3625 - [`Error::description` has been deprecated, and its use will now produce a
3626 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3628 [68253]: https://github.com/rust-lang/rust/pull/68253/
3629 [68348]: https://github.com/rust-lang/rust/pull/68348/
3630 [67935]: https://github.com/rust-lang/rust/pull/67935/
3631 [68339]: https://github.com/rust-lang/rust/pull/68339/
3632 [68122]: https://github.com/rust-lang/rust/pull/68122/
3633 [64273]: https://github.com/rust-lang/rust/pull/64273/
3634 [67712]: https://github.com/rust-lang/rust/pull/67712/
3635 [67887]: https://github.com/rust-lang/rust/pull/67887/
3636 [67131]: https://github.com/rust-lang/rust/pull/67131/
3637 [67233]: https://github.com/rust-lang/rust/pull/67233/
3638 [66899]: https://github.com/rust-lang/rust/pull/66899/
3639 [66919]: https://github.com/rust-lang/rust/pull/66919/
3640 [66254]: https://github.com/rust-lang/rust/pull/66254/
3641 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3642 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3643 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3644 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3645 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3646 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3647 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3648 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3649 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3652 Version 1.41.1 (2020-02-27)
3653 ===========================
3655 * [Always check types of static items][69145]
3656 * [Always check lifetime bounds of `Copy` impls][69145]
3657 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3659 [69225]: https://github.com/rust-lang/rust/issues/69225
3660 [69145]: https://github.com/rust-lang/rust/pull/69145
3663 Version 1.41.0 (2020-01-30)
3664 ===========================
3669 - [You can now pass type parameters to foreign items when implementing
3670 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3671 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3672 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3673 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3674 - [You can now use any valid identifier in a `format_args` macro.][66847]
3675 Previously identifiers starting with an underscore were not allowed.
3676 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3677 enum variants.][66183] These are still rejected semantically, but
3678 can be seen and parsed by procedural macros and conditional compilation.
3679 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3680 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3681 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3683 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3688 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3689 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3690 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3691 - [You can now pass an arguments file passing the `@path` syntax
3692 to rustc.][66172] Note that the format differs somewhat from what is
3693 found in other tooling; please see [the documentation][argfile-docs] for
3695 - [You can now provide `--extern` flag without a path, indicating that it is
3696 available from the search path or specified with an `-L` flag.][64882]
3698 \* Refer to Rust's [platform support page][platform-support-doc] for more
3699 information on Rust's tiered platform support.
3701 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3706 - [The `core::panic` module is now stable.][66771] It was already stable
3708 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3709 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3710 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3715 - [`Result::map_or`]
3716 - [`Result::map_or_else`]
3717 - [`std::rc::Weak::weak_count`]
3718 - [`std::rc::Weak::strong_count`]
3719 - [`std::sync::Weak::weak_count`]
3720 - [`std::sync::Weak::strong_count`]
3725 - [Cargo will now document all the private items for binary crates
3726 by default.][cargo/7593]
3727 - [`cargo-install` will now reinstall the package if it detects that it is out
3728 of date.][cargo/7560]
3729 - [Cargo.lock now uses a more git friendly format that should help to reduce
3730 merge conflicts.][cargo/7579]
3731 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3732 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3733 optimisation level to `2` for debug builds. You can also use
3734 `[profile.<profile>.build-override]` to override build scripts and
3740 - [You can now specify `edition` in documentation code blocks to compile the block
3741 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3742 should be compiled the 2018 edition of Rust.
3743 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3744 current theme with `--check-theme`.][54733]
3745 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3750 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3751 Apple targets.][apple-32bit-drop] This means that the source code is still
3752 available to build, but the targets are no longer being tested and release
3753 binaries for those platforms will no longer be distributed by the Rust project.
3754 Please refer to the linked blog post for more information.
3756 [54733]: https://github.com/rust-lang/rust/pull/54733/
3757 [61351]: https://github.com/rust-lang/rust/pull/61351/
3758 [62514]: https://github.com/rust-lang/rust/pull/62514/
3759 [67255]: https://github.com/rust-lang/rust/pull/67255/
3760 [66661]: https://github.com/rust-lang/rust/pull/66661/
3761 [66771]: https://github.com/rust-lang/rust/pull/66771/
3762 [66847]: https://github.com/rust-lang/rust/pull/66847/
3763 [66238]: https://github.com/rust-lang/rust/pull/66238/
3764 [66277]: https://github.com/rust-lang/rust/pull/66277/
3765 [66325]: https://github.com/rust-lang/rust/pull/66325/
3766 [66172]: https://github.com/rust-lang/rust/pull/66172/
3767 [66183]: https://github.com/rust-lang/rust/pull/66183/
3768 [65879]: https://github.com/rust-lang/rust/pull/65879/
3769 [65013]: https://github.com/rust-lang/rust/pull/65013/
3770 [64882]: https://github.com/rust-lang/rust/pull/64882/
3771 [64325]: https://github.com/rust-lang/rust/pull/64325/
3772 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3773 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3774 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3775 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3776 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3777 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3778 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3779 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3780 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3781 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3782 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3784 Version 1.40.0 (2019-12-19)
3785 ===========================
3789 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3790 `const` contexts.][65188] e.g.
3793 pub struct Point(i32, i32);
3795 const ORIGIN: Point = {
3796 let constructor = Point;
3802 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3803 indicate that there may be variants or fields added in the future.][64639]
3804 For example this requires adding a wild-card branch (`_ => {}`) to any match
3805 statements on a non-exhaustive `enum`. [(RFC 2008)]
3806 - [You can now use function-like procedural macros in `extern` blocks and in
3807 type positions.][63931] e.g. `type Generated = macro!();`
3808 - [Function-like and attribute procedural macros can now emit
3809 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3810 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3811 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3812 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3816 - [Added tier 3 support\* for the
3817 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3818 - [Added tier 3 support for the
3819 `aarch64-unknown-none-softfloat` target.][64589]
3820 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3821 `mips64el-unknown-linux-muslabi64` targets.][65843]
3823 \* Refer to Rust's [platform support page][platform-support-doc] for more
3824 information on Rust's tiered platform support.
3828 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3832 - [`BTreeMap::get_key_value`]
3833 - [`HashMap::get_key_value`]
3834 - [`Option::as_deref_mut`]
3835 - [`Option::as_deref`]
3836 - [`Option::flatten`]
3837 - [`UdpSocket::peer_addr`]
3838 - [`f32::to_be_bytes`]
3839 - [`f32::to_le_bytes`]
3840 - [`f32::to_ne_bytes`]
3841 - [`f64::to_be_bytes`]
3842 - [`f64::to_le_bytes`]
3843 - [`f64::to_ne_bytes`]
3844 - [`f32::from_be_bytes`]
3845 - [`f32::from_le_bytes`]
3846 - [`f32::from_ne_bytes`]
3847 - [`f64::from_be_bytes`]
3848 - [`f64::from_le_bytes`]
3849 - [`f64::from_ne_bytes`]
3856 - [Cargo will now always display warnings, rather than only on
3857 fresh builds.][cargo/7450]
3858 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3859 now produce an error.][cargo/7507] Previously these flags were ignored.
3860 - [You can now publish `dev-dependencies` without including
3861 a `version`.][cargo/7333]
3865 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3866 when running documentation tests with `rustdoc`.][63803]
3870 - [As previously announced, any previous NLL warnings in the 2015 edition are
3871 now hard errors.][64221]
3872 - [The `include!` macro will now warn if it failed to include the
3873 entire file.][64284] The `include!` macro unintentionally only includes the
3874 first _expression_ in a file, and this can be unintuitive. This will become
3875 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3876 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3877 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3878 or `extern` blocks now correctly emits a hard error.
3880 [65294]: https://github.com/rust-lang/rust/pull/65294/
3881 [66103]: https://github.com/rust-lang/rust/pull/66103/
3882 [65843]: https://github.com/rust-lang/rust/pull/65843/
3883 [65188]: https://github.com/rust-lang/rust/pull/65188/
3884 [65092]: https://github.com/rust-lang/rust/pull/65092/
3885 [64589]: https://github.com/rust-lang/rust/pull/64589/
3886 [64639]: https://github.com/rust-lang/rust/pull/64639/
3887 [64221]: https://github.com/rust-lang/rust/pull/64221/
3888 [64284]: https://github.com/rust-lang/rust/pull/64284/
3889 [63931]: https://github.com/rust-lang/rust/pull/63931/
3890 [64035]: https://github.com/rust-lang/rust/pull/64035/
3891 [63674]: https://github.com/rust-lang/rust/pull/63674/
3892 [63803]: https://github.com/rust-lang/rust/pull/63803/
3893 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3894 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3895 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3896 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3897 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3898 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3899 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3900 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3901 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3902 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3903 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3904 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3905 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3906 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3907 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3908 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3909 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3910 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3911 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3912 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3913 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3914 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3915 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3916 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3917 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3920 Version 1.39.0 (2019-11-07)
3921 ===========================
3925 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3926 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3927 - [You can now use certain attributes on function, closure, and function pointer
3928 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3929 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3930 attributes applied to items. e.g.
3933 #[cfg(windows)] slice: &[u16],
3934 #[cfg(not(windows))] slice: &[u8],
3939 - [You can now take shared references to bind-by-move patterns in the `if` guards
3940 of `match` arms.][63118] e.g.
3943 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3947 // ---- `nums` is bound by move.
3948 if nums.iter().sum::<u8>() == 10
3949 // ^------ `.iter()` implicitly takes a reference to `nums`.
3952 // ----------- Legal as `nums` was bound by move and so we have ownership.
3954 _ => unreachable!(),
3963 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3964 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3965 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3966 **Note** Cargo currently doesn't use this feature. Refer to
3967 [cargo#7315][cargo/7315] to track this feature's progress.
3968 - [You can now pass `--show-output` argument to test binaries to print the
3969 output of successful tests.][62600]
3972 \* Refer to Rust's [platform support page][platform-support-doc] for more
3973 information on Rust's tiered platform support.
3977 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3978 - [`LinkedList::new` is now a `const` function.][63684]
3979 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3980 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3981 now `const`.][63786]
3985 - [`Pin::into_inner`]
3986 - [`Instant::checked_duration_since`]
3987 - [`Instant::saturating_duration_since`]
3991 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3992 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3993 `--all` is now deprecated.
3997 - [You can now pass `-Clinker` to rustdoc to control the linker used
3998 for compiling doctests.][63834]
4002 - [Code that was previously accepted by the old borrow checker, but rejected by
4003 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
4004 previously a warning, and will also become a hard error in the Rust 2015
4005 edition in the 1.40.0 release.
4006 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
4007 run tests.][63827] This should improve performance when running a large
4009 - [The `try!` macro will now issue a deprecation warning.][62672] It is
4010 recommended to use the `?` operator instead.
4011 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
4014 [62600]: https://github.com/rust-lang/rust/pull/62600/
4015 [62672]: https://github.com/rust-lang/rust/pull/62672/
4016 [63118]: https://github.com/rust-lang/rust/pull/63118/
4017 [63209]: https://github.com/rust-lang/rust/pull/63209/
4018 [63402]: https://github.com/rust-lang/rust/pull/63402/
4019 [63565]: https://github.com/rust-lang/rust/pull/63565/
4020 [63595]: https://github.com/rust-lang/rust/pull/63595/
4021 [63684]: https://github.com/rust-lang/rust/pull/63684/
4022 [63698]: https://github.com/rust-lang/rust/pull/63698/
4023 [63770]: https://github.com/rust-lang/rust/pull/63770/
4024 [63786]: https://github.com/rust-lang/rust/pull/63786/
4025 [63827]: https://github.com/rust-lang/rust/pull/63827/
4026 [63834]: https://github.com/rust-lang/rust/pull/63834/
4027 [64010]: https://github.com/rust-lang/rust/pull/64010/
4028 [64028]: https://github.com/rust-lang/rust/pull/64028/
4029 [64334]: https://github.com/rust-lang/rust/pull/64334/
4030 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
4031 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
4032 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
4033 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
4034 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
4035 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
4037 Version 1.38.0 (2019-09-26)
4038 ==========================
4042 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
4043 - [The `#[deprecated]` attribute can now be used on macros.][62042]
4047 - [Added pipelined compilation support to `rustc`.][62766] This will
4048 improve compilation times in some cases. For further information please refer
4049 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
4050 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
4051 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
4052 `x86_64-uwp-windows-msvc` targets.][60260]
4053 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
4054 `armv7-unknown-linux-musleabi` targets.][63107]
4055 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
4056 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
4057 - [Upgraded to LLVM 9.][62592]
4059 \* Refer to Rust's [platform support page][platform-support-doc] for more
4060 information on Rust's tiered platform support.
4064 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
4065 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
4066 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
4067 is available at `std::clone::Clone`). This also makes all built-in macros
4068 available in `std`/`core` root. e.g. `std::include_bytes!`.
4069 - [`str::Chars` now implements `Debug`.][63000]
4070 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
4071 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
4072 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
4073 - [Added euclidean remainder and division operations (`div_euclid`,
4074 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
4075 `overflowing`, and `wrapping` versions are available for all
4077 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
4078 `PartialEq`.][61491]
4079 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
4083 - [`<*const T>::cast`]
4084 - [`<*mut T>::cast`]
4085 - [`Duration::as_secs_f32`]
4086 - [`Duration::as_secs_f64`]
4087 - [`Duration::div_f32`]
4088 - [`Duration::div_f64`]
4089 - [`Duration::from_secs_f32`]
4090 - [`Duration::from_secs_f64`]
4091 - [`Duration::mul_f32`]
4092 - [`Duration::mul_f64`]
4093 - [`any::type_name`]
4097 - [Added pipelined compilation support to `cargo`.][cargo/7143]
4098 - [You can now pass the `--features` option multiple times to enable
4099 multiple features.][cargo/7084]
4104 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
4108 - [`rustc` will now warn about some incorrect uses of
4109 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
4113 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
4115 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
4116 issues][62896] with certain crates such as libc.
4118 [60260]: https://github.com/rust-lang/rust/pull/60260/
4119 [61457]: https://github.com/rust-lang/rust/pull/61457/
4120 [61491]: https://github.com/rust-lang/rust/pull/61491/
4121 [61884]: https://github.com/rust-lang/rust/pull/61884/
4122 [61953]: https://github.com/rust-lang/rust/pull/61953/
4123 [62042]: https://github.com/rust-lang/rust/pull/62042/
4124 [62528]: https://github.com/rust-lang/rust/pull/62528/
4125 [62583]: https://github.com/rust-lang/rust/pull/62583/
4126 [62735]: https://github.com/rust-lang/rust/pull/62735/
4127 [62766]: https://github.com/rust-lang/rust/pull/62766/
4128 [62784]: https://github.com/rust-lang/rust/pull/62784/
4129 [62592]: https://github.com/rust-lang/rust/pull/62592/
4130 [62785]: https://github.com/rust-lang/rust/issues/62785/
4131 [62814]: https://github.com/rust-lang/rust/pull/62814/
4132 [62896]: https://github.com/rust-lang/rust/issues/62896/
4133 [63000]: https://github.com/rust-lang/rust/pull/63000/
4134 [63056]: https://github.com/rust-lang/rust/pull/63056/
4135 [63107]: https://github.com/rust-lang/rust/pull/63107/
4136 [63346]: https://github.com/rust-lang/rust/pull/63346/
4137 [63421]: https://github.com/rust-lang/rust/pull/63421/
4138 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
4139 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
4140 [63048]: https://github.com/rust-lang/rust/pull/63048
4141 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4142 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4143 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
4144 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
4145 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
4146 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
4147 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
4148 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
4149 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
4150 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
4151 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
4152 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
4153 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
4155 Version 1.37.0 (2019-08-15)
4156 ==========================
4160 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
4161 [`Box`][62228], or an [array][62235] and unused.
4162 - [You can now use the `cfg` and `cfg_attr` attributes on
4163 generic parameters.][61547]
4164 - [You can now use enum variants through type alias.][61682] e.g. You can
4165 write the following:
4167 type MyOption = Option<u8>;
4169 fn increment_or_zero(x: MyOption) -> u8 {
4171 MyOption::Some(y) => y + 1,
4172 MyOption::None => 0,
4176 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
4177 `const _: u32 = 5;`.
4178 - [You can now use `#[repr(align(X)]` on enums.][61229]
4179 - [The `?` Kleene macro operator is now available in the
4180 2015 edition.][60932]
4184 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
4185 and `-C profile-use` flags.][61268] For more information on how to use profile
4186 guided optimization, please refer to the [rustc book][rustc-book-pgo].
4187 - [The `rust-lldb` wrapper script should now work again.][61827]
4191 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
4195 - [`BufReader::buffer`]
4196 - [`BufWriter::buffer`]
4197 - [`Cell::from_mut`]
4198 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
4199 - [`DoubleEndedIterator::nth_back`]
4201 - [`Wrapping::reverse_bits`]
4202 - [`i128::reverse_bits`]
4203 - [`i16::reverse_bits`]
4204 - [`i32::reverse_bits`]
4205 - [`i64::reverse_bits`]
4206 - [`i8::reverse_bits`]
4207 - [`isize::reverse_bits`]
4208 - [`slice::copy_within`]
4209 - [`u128::reverse_bits`]
4210 - [`u16::reverse_bits`]
4211 - [`u32::reverse_bits`]
4212 - [`u64::reverse_bits`]
4213 - [`u8::reverse_bits`]
4214 - [`usize::reverse_bits`]
4218 - [`Cargo.lock` files are now included by default when publishing executable crates
4219 with executables.][cargo/7026]
4220 - [You can now specify `default-run="foo"` in `[package]` to specify the
4221 default executable to use for `cargo run`.][cargo/7056]
4228 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4229 Please transition your code to using the `..=` syntax for inclusive
4231 - [Using a trait object without the `dyn` will now warn by default.][61203]
4232 Please transition your code to use `dyn Trait` for trait objects instead.
4234 [62228]: https://github.com/rust-lang/rust/pull/62228/
4235 [62235]: https://github.com/rust-lang/rust/pull/62235/
4236 [61802]: https://github.com/rust-lang/rust/pull/61802/
4237 [61827]: https://github.com/rust-lang/rust/pull/61827/
4238 [61547]: https://github.com/rust-lang/rust/pull/61547/
4239 [61682]: https://github.com/rust-lang/rust/pull/61682/
4240 [61268]: https://github.com/rust-lang/rust/pull/61268/
4241 [61342]: https://github.com/rust-lang/rust/pull/61342/
4242 [61347]: https://github.com/rust-lang/rust/pull/61347/
4243 [61100]: https://github.com/rust-lang/rust/pull/61100/
4244 [61203]: https://github.com/rust-lang/rust/pull/61203/
4245 [61229]: https://github.com/rust-lang/rust/pull/61229/
4246 [60932]: https://github.com/rust-lang/rust/pull/60932/
4247 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4248 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4249 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4250 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4251 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4252 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4253 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4254 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4255 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4256 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4257 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4258 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4259 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4260 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4261 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4262 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4263 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4264 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4265 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4266 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4267 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4268 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4269 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4272 Version 1.36.0 (2019-07-04)
4273 ==========================
4277 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4278 - [The order of traits in trait objects no longer affects the semantics of that
4279 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4280 `dyn fmt::Debug + Send`, where this was previously not the case.
4284 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4285 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4286 - [`mem::needs_drop` is now available as a const fn.][60364]
4287 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4288 - [`String` now implements `BorrowMut<str>`.][60404]
4289 - [`io::Cursor` now implements `Default`.][60234]
4290 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4291 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4292 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4293 environment has access to heap memory allocation.
4294 - [`String` now implements `From<&String>`.][59825]
4295 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4296 return a tuple of each argument when there is multiple arguments.
4297 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4302 - [`VecDeque::rotate_left`]
4303 - [`VecDeque::rotate_right`]
4304 - [`Iterator::copied`]
4306 - [`io::IoSliceMut`]
4307 - [`Read::read_vectored`]
4308 - [`Write::write_vectored`]
4309 - [`str::as_mut_ptr`]
4310 - [`mem::MaybeUninit`]
4311 - [`pointer::align_offset`]
4312 - [`future::Future`]
4314 - [`task::RawWaker`]
4315 - [`task::RawWakerVTable`]
4321 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4322 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4324 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4328 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4335 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4336 longer recommended, and will be deprecated in 1.39.0.
4338 [60318]: https://github.com/rust-lang/rust/pull/60318/
4339 [60364]: https://github.com/rust-lang/rust/pull/60364/
4340 [60370]: https://github.com/rust-lang/rust/pull/60370/
4341 [60404]: https://github.com/rust-lang/rust/pull/60404/
4342 [60234]: https://github.com/rust-lang/rust/pull/60234/
4343 [60244]: https://github.com/rust-lang/rust/pull/60244/
4344 [58623]: https://github.com/rust-lang/rust/pull/58623/
4345 [59648]: https://github.com/rust-lang/rust/pull/59648/
4346 [59675]: https://github.com/rust-lang/rust/pull/59675/
4347 [59825]: https://github.com/rust-lang/rust/pull/59825/
4348 [59826]: https://github.com/rust-lang/rust/pull/59826/
4349 [59445]: https://github.com/rust-lang/rust/pull/59445/
4350 [59114]: https://github.com/rust-lang/rust/pull/59114/
4351 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4352 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4353 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4354 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4355 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4356 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4357 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4358 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4359 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4360 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4361 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4362 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4363 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4364 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4365 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4366 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4367 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4368 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4369 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4370 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4373 Version 1.35.0 (2019-05-23)
4374 ==========================
4378 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4379 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4380 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4382 unsafe fn call_unsafe(func: unsafe fn()) {
4387 unsafe { call_unsafe(|| {}); }
4394 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4395 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4396 - [Added the `wasm32-unknown-wasi` target.][59464]
4401 - [`Thread` will now show its ID in `Debug` output.][59460]
4402 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4403 - [`alloc::System` now implements `Default`.][59451]
4404 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4406 - [`char::{ToLowercase, ToUppercase}` now
4407 implement `ExactSizeIterator`.][58778]
4408 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4409 - [Removed the `Read` trait bounds
4410 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4411 - [You can now call the `dbg!` macro without any parameters to print the file
4412 and line where it is called.][57847]
4413 - [In place ASCII case conversions are now up to 4× faster.][59283]
4414 e.g. `str::make_ascii_lowercase`
4415 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4422 - [`RefCell::replace_with`]
4423 - [`RefCell::map_split`]
4425 - [`Range::contains`]
4426 - [`RangeFrom::contains`]
4427 - [`RangeTo::contains`]
4428 - [`RangeInclusive::contains`]
4429 - [`RangeToInclusive::contains`]
4430 - [`Option::copied`]
4434 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4435 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4440 - [The Rust toolchain is now available natively for musl based distros.][58575]
4442 [59460]: https://github.com/rust-lang/rust/pull/59460/
4443 [59464]: https://github.com/rust-lang/rust/pull/59464/
4444 [59500]: https://github.com/rust-lang/rust/pull/59500/
4445 [59512]: https://github.com/rust-lang/rust/pull/59512/
4446 [59580]: https://github.com/rust-lang/rust/pull/59580/
4447 [59283]: https://github.com/rust-lang/rust/pull/59283/
4448 [59451]: https://github.com/rust-lang/rust/pull/59451/
4449 [59076]: https://github.com/rust-lang/rust/pull/59076/
4450 [58778]: https://github.com/rust-lang/rust/pull/58778/
4451 [58717]: https://github.com/rust-lang/rust/pull/58717/
4452 [58369]: https://github.com/rust-lang/rust/pull/58369/
4453 [58423]: https://github.com/rust-lang/rust/pull/58423/
4454 [58080]: https://github.com/rust-lang/rust/pull/58080/
4455 [57847]: https://github.com/rust-lang/rust/pull/57847/
4456 [58575]: https://github.com/rust-lang/rust/pull/58575
4457 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4458 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4459 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4460 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4461 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4462 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4463 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4464 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4465 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4466 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4467 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4468 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4470 Version 1.34.2 (2019-05-14)
4471 ===========================
4473 * [Destabilize the `Error::type_id` function due to a security
4474 vulnerability][60785] ([CVE-2019-12083])
4476 [60785]: https://github.com/rust-lang/rust/pull/60785
4477 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4479 Version 1.34.1 (2019-04-25)
4480 ===========================
4482 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4483 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4484 * [Fix Clippy panic when checking some macros][clippy/3805]
4486 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4487 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4488 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4490 Version 1.34.0 (2019-04-11)
4491 ==========================
4495 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4496 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4498 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4499 `#[attr{}]` procedural macros.][57367]
4500 - [You can now write `extern crate self as foo;`][57407] to import your
4501 crate's root into the extern prelude.
4506 - [You can now target `riscv64imac-unknown-none-elf` and
4507 `riscv64gc-unknown-none-elf`.][58406]
4508 - [You can now enable linker plugin LTO optimisations with
4509 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4510 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4512 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4517 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4518 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4519 the `Hash` trait to create an iterator.
4520 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4521 methods.][58421] Most notably you no longer require the `Ord` trait to create
4523 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4524 for all numeric types.][58044]
4525 - [Indexing a `str` is now generic over all types that
4526 implement `SliceIndex<str>`.][57604]
4527 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4528 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4529 produce a warning if their returning type is unused.
4530 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4531 `overflowing_pow` are now available for all numeric types.][57873] These are
4532 equivalent to methods such as `wrapping_add` for the `pow` operation.
4540 * [`Error::type_id`]
4541 * [`atomic::AtomicI16`]
4542 * [`atomic::AtomicI32`]
4543 * [`atomic::AtomicI64`]
4544 * [`atomic::AtomicI8`]
4545 * [`atomic::AtomicU16`]
4546 * [`atomic::AtomicU32`]
4547 * [`atomic::AtomicU64`]
4548 * [`atomic::AtomicU8`]
4549 * [`convert::Infallible`]
4550 * [`convert::TryFrom`]
4551 * [`convert::TryInto`]
4553 * [`iter::successors`]
4554 * [`num::NonZeroI128`]
4555 * [`num::NonZeroI16`]
4556 * [`num::NonZeroI32`]
4557 * [`num::NonZeroI64`]
4558 * [`num::NonZeroI8`]
4559 * [`num::NonZeroIsize`]
4560 * [`slice::sort_by_cached_key`]
4561 * [`str::escape_debug`]
4562 * [`str::escape_default`]
4563 * [`str::escape_unicode`]
4564 * [`str::split_ascii_whitespace`]
4567 * [`Instant::checked_add`]
4568 * [`Instant::checked_sub`]
4569 * [`SystemTime::checked_add`]
4570 * [`SystemTime::checked_sub`]
4574 - [You can now use alternative registries to crates.io.][cargo/6654]
4578 - [You can now use the `?` operator in your documentation tests without manually
4579 adding `fn main() -> Result<(), _> {}`.][56470]
4583 - [`Command::before_exec` is being replaced by the unsafe method
4584 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4585 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4586 can now use `const` functions in `static` variables.
4588 [58370]: https://github.com/rust-lang/rust/pull/58370/
4589 [58406]: https://github.com/rust-lang/rust/pull/58406/
4590 [58421]: https://github.com/rust-lang/rust/pull/58421/
4591 [58166]: https://github.com/rust-lang/rust/pull/58166/
4592 [58044]: https://github.com/rust-lang/rust/pull/58044/
4593 [58057]: https://github.com/rust-lang/rust/pull/58057/
4594 [58059]: https://github.com/rust-lang/rust/pull/58059/
4595 [57809]: https://github.com/rust-lang/rust/pull/57809/
4596 [57873]: https://github.com/rust-lang/rust/pull/57873/
4597 [57604]: https://github.com/rust-lang/rust/pull/57604/
4598 [57367]: https://github.com/rust-lang/rust/pull/57367/
4599 [57407]: https://github.com/rust-lang/rust/pull/57407/
4600 [57425]: https://github.com/rust-lang/rust/pull/57425/
4601 [57106]: https://github.com/rust-lang/rust/pull/57106/
4602 [56470]: https://github.com/rust-lang/rust/pull/56470/
4603 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4604 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4605 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4606 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4607 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4608 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4609 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4610 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4611 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4612 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4613 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4614 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4615 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4616 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4617 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4618 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4619 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4620 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4621 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4622 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4623 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4624 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4625 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4626 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4627 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4628 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4629 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4630 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4631 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4632 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4633 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4636 Version 1.33.0 (2019-02-28)
4637 ==========================
4641 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4642 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4643 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4644 E.g. You can have match statement on a `u8` that covers `0..=255` and
4645 you would no longer be required to have a `_ => unreachable!()` case.
4646 - [You can now have multiple patterns in `if let` and `while let`
4647 expressions.][57532] You can do this with the same syntax as a `match`
4657 let state = Creature::Crab("Ferris");
4659 if let Creature::Crab(name) | Creature::Person(name) = state {
4660 println!("This creature's name is: {}", name);
4664 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4665 this feature will by default produce a warning as this behaviour can be
4666 unintuitive. E.g. `if let _ = 5 {}`
4667 - [You can now use `let` bindings, assignments, expression statements,
4668 and irrefutable pattern destructuring in const functions.][57175]
4669 - [You can now call unsafe const functions.][57067] E.g.
4671 const unsafe fn foo() -> i32 { 5 }
4672 const fn bar() -> i32 {
4676 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4677 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4678 - [You can now specify a specific alignment with the `#[repr(packed)]`
4679 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4680 with an alignment of 2 bytes and a size of 6 bytes.
4681 - [You can now import an item from a module as an `_`.][56303] This allows you to
4682 import a trait's impls, and not have the name in the namespace. E.g.
4684 use std::io::Read as _;
4686 // Allowed as there is only one `Read` in the module.
4689 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4693 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4694 command line argument.][56351]
4695 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4696 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4697 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4698 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4699 information on Rust's platform support.
4700 - [Added support for the `thumbv7neon-linux-androideabi` and
4701 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4702 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4706 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4707 functions for all numeric types.][57566]
4708 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4709 are now `const` functions for all numeric types.][57105]
4710 - [The methods `is_positive` and `is_negative` are now `const` functions for
4711 all signed numeric types.][57105]
4712 - [The `get` method for all `NonZero` types is now `const`.][57167]
4713 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4714 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4715 numeric types.][57234]
4716 - [`Ipv4Addr::new` is now a `const` function][57234]
4720 - [`unix::FileExt::read_exact_at`]
4721 - [`unix::FileExt::write_all_at`]
4722 - [`Option::transpose`]
4723 - [`Result::transpose`]
4724 - [`convert::identity`]
4727 - [`marker::PhantomPinned`]
4728 - [`Vec::resize_with`]
4729 - [`VecDeque::resize_with`]
4730 - [`Duration::as_millis`]
4731 - [`Duration::as_micros`]
4732 - [`Duration::as_nanos`]
4737 - [You can now publish crates that require a feature flag to compile with
4738 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4739 - [Cargo should now rebuild a crate if a file was modified during the initial
4744 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4745 are now deprecated in the standard library, and their usage will now produce a warning.
4746 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4748 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4750 - [Libtest no longer creates a new thread for each test when
4751 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4753 [56243]: https://github.com/rust-lang/rust/pull/56243
4754 [56303]: https://github.com/rust-lang/rust/pull/56303/
4755 [56351]: https://github.com/rust-lang/rust/pull/56351/
4756 [56362]: https://github.com/rust-lang/rust/pull/56362
4757 [56642]: https://github.com/rust-lang/rust/pull/56642/
4758 [56769]: https://github.com/rust-lang/rust/pull/56769/
4759 [56805]: https://github.com/rust-lang/rust/pull/56805
4760 [56947]: https://github.com/rust-lang/rust/pull/56947/
4761 [57049]: https://github.com/rust-lang/rust/pull/57049/
4762 [57067]: https://github.com/rust-lang/rust/pull/57067/
4763 [57105]: https://github.com/rust-lang/rust/pull/57105
4764 [57130]: https://github.com/rust-lang/rust/pull/57130/
4765 [57167]: https://github.com/rust-lang/rust/pull/57167/
4766 [57175]: https://github.com/rust-lang/rust/pull/57175/
4767 [57234]: https://github.com/rust-lang/rust/pull/57234/
4768 [57332]: https://github.com/rust-lang/rust/pull/57332/
4769 [57465]: https://github.com/rust-lang/rust/pull/57465/
4770 [57532]: https://github.com/rust-lang/rust/pull/57532/
4771 [57535]: https://github.com/rust-lang/rust/pull/57535/
4772 [57566]: https://github.com/rust-lang/rust/pull/57566/
4773 [57615]: https://github.com/rust-lang/rust/pull/57615/
4774 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4775 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4776 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4777 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4778 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4779 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4780 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4781 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4782 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4783 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4784 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4785 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4786 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4787 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4788 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4789 [platform-support]: https://forge.rust-lang.org/platform-support.html
4791 Version 1.32.0 (2019-01-17)
4792 ==========================
4797 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4798 operator allows you to specify zero or one repetitions similar to the `*` and
4800 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4801 now always resolve to the item (`enum`, `struct`, etc.) available in the
4802 module if present, before resolving to a external crate or an item the prelude.][56759]
4805 enum Color { Red, Green, Blue }
4811 - [You can now match against `PhantomData<T>` types.][55837]
4812 - [You can now match against literals in macros with the `literal`
4813 specifier.][56072] This will match against a literal of any type.
4814 E.g. `1`, `'A'`, `"Hello World"`
4815 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4817 struct Point(i32, i32);
4820 pub fn new(x: i32, y: i32) -> Self {
4824 pub fn is_origin(&self) -> bool {
4832 - [Self can also now be used in type definitions.][56366] E.g.
4836 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4839 Cons(T, Box<Self>) // likewise here
4842 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4843 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4847 - [The default allocator has changed from jemalloc to the default allocator on
4848 your system.][55238] The compiler itself on Linux & macOS will still use
4849 jemalloc, but programs compiled with it will use the system allocator.
4850 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4854 - [`PathBuf` now implements `FromStr`.][55148]
4855 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4856 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4857 easily debug expressions in your rust program. E.g.
4860 let b = dbg!(a * 2) + 1;
4861 // ^-- prints: [src/main.rs:4] a * 2 = 4
4865 The following APIs are now `const` functions and can be used in a
4869 - [`UnsafeCell::get`]
4870 - [`char::is_ascii`]
4872 - [`ManuallyDrop::new`]
4873 - [`ManuallyDrop::into_inner`]
4874 - [`RangeInclusive::start`]
4875 - [`RangeInclusive::end`]
4876 - [`NonNull::as_ptr`]
4879 - [`Duration::as_secs`]
4880 - [`Duration::subsec_millis`]
4881 - [`Duration::subsec_micros`]
4882 - [`Duration::subsec_nanos`]
4884 - [`Ipv4Addr::is_unspecified`]
4886 - [`Ipv6Addr::octets`]
4890 - [`i8::to_be_bytes`]
4891 - [`i8::to_le_bytes`]
4892 - [`i8::to_ne_bytes`]
4893 - [`i8::from_be_bytes`]
4894 - [`i8::from_le_bytes`]
4895 - [`i8::from_ne_bytes`]
4896 - [`i16::to_be_bytes`]
4897 - [`i16::to_le_bytes`]
4898 - [`i16::to_ne_bytes`]
4899 - [`i16::from_be_bytes`]
4900 - [`i16::from_le_bytes`]
4901 - [`i16::from_ne_bytes`]
4902 - [`i32::to_be_bytes`]
4903 - [`i32::to_le_bytes`]
4904 - [`i32::to_ne_bytes`]
4905 - [`i32::from_be_bytes`]
4906 - [`i32::from_le_bytes`]
4907 - [`i32::from_ne_bytes`]
4908 - [`i64::to_be_bytes`]
4909 - [`i64::to_le_bytes`]
4910 - [`i64::to_ne_bytes`]
4911 - [`i64::from_be_bytes`]
4912 - [`i64::from_le_bytes`]
4913 - [`i64::from_ne_bytes`]
4914 - [`i128::to_be_bytes`]
4915 - [`i128::to_le_bytes`]
4916 - [`i128::to_ne_bytes`]
4917 - [`i128::from_be_bytes`]
4918 - [`i128::from_le_bytes`]
4919 - [`i128::from_ne_bytes`]
4920 - [`isize::to_be_bytes`]
4921 - [`isize::to_le_bytes`]
4922 - [`isize::to_ne_bytes`]
4923 - [`isize::from_be_bytes`]
4924 - [`isize::from_le_bytes`]
4925 - [`isize::from_ne_bytes`]
4926 - [`u8::to_be_bytes`]
4927 - [`u8::to_le_bytes`]
4928 - [`u8::to_ne_bytes`]
4929 - [`u8::from_be_bytes`]
4930 - [`u8::from_le_bytes`]
4931 - [`u8::from_ne_bytes`]
4932 - [`u16::to_be_bytes`]
4933 - [`u16::to_le_bytes`]
4934 - [`u16::to_ne_bytes`]
4935 - [`u16::from_be_bytes`]
4936 - [`u16::from_le_bytes`]
4937 - [`u16::from_ne_bytes`]
4938 - [`u32::to_be_bytes`]
4939 - [`u32::to_le_bytes`]
4940 - [`u32::to_ne_bytes`]
4941 - [`u32::from_be_bytes`]
4942 - [`u32::from_le_bytes`]
4943 - [`u32::from_ne_bytes`]
4944 - [`u64::to_be_bytes`]
4945 - [`u64::to_le_bytes`]
4946 - [`u64::to_ne_bytes`]
4947 - [`u64::from_be_bytes`]
4948 - [`u64::from_le_bytes`]
4949 - [`u64::from_ne_bytes`]
4950 - [`u128::to_be_bytes`]
4951 - [`u128::to_le_bytes`]
4952 - [`u128::to_ne_bytes`]
4953 - [`u128::from_be_bytes`]
4954 - [`u128::from_le_bytes`]
4955 - [`u128::from_ne_bytes`]
4956 - [`usize::to_be_bytes`]
4957 - [`usize::to_le_bytes`]
4958 - [`usize::to_ne_bytes`]
4959 - [`usize::from_be_bytes`]
4960 - [`usize::from_le_bytes`]
4961 - [`usize::from_ne_bytes`]
4965 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4966 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4970 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4974 - [The argument types for AVX's
4975 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4976 been changed from `*const` to `*mut` as the previous implementation
4980 [55148]: https://github.com/rust-lang/rust/pull/55148/
4981 [55238]: https://github.com/rust-lang/rust/pull/55238/
4982 [55280]: https://github.com/rust-lang/rust/pull/55280/
4983 [55610]: https://github.com/rust-lang/rust/pull/55610/
4984 [55663]: https://github.com/rust-lang/rust/pull/55663/
4985 [55702]: https://github.com/rust-lang/rust/pull/55702/
4986 [55837]: https://github.com/rust-lang/rust/pull/55837/
4987 [55843]: https://github.com/rust-lang/rust/pull/55843/
4988 [56072]: https://github.com/rust-lang/rust/pull/56072/
4989 [56245]: https://github.com/rust-lang/rust/pull/56245/
4990 [56365]: https://github.com/rust-lang/rust/pull/56365/
4991 [56366]: https://github.com/rust-lang/rust/pull/56366/
4992 [56395]: https://github.com/rust-lang/rust/pull/56395/
4993 [56759]: https://github.com/rust-lang/rust/pull/56759/
4994 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4995 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4996 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4997 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4998 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4999 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5000 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5001 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
5002 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
5003 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
5004 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
5005 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
5006 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
5007 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
5008 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
5009 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
5010 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
5011 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
5012 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
5013 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
5014 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
5015 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
5016 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
5017 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
5018 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
5019 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
5020 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
5021 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
5022 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
5023 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
5024 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
5025 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
5026 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
5027 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
5028 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
5029 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
5030 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
5031 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
5032 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
5033 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
5034 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
5035 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
5036 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
5037 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
5038 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
5039 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
5040 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
5041 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
5042 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
5043 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
5044 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
5045 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
5046 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
5047 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
5048 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
5049 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
5050 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
5051 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
5052 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
5053 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
5054 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
5055 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
5056 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
5057 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
5058 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
5059 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
5060 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
5061 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
5062 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
5063 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
5064 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
5065 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
5066 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
5067 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
5068 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
5069 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
5070 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
5071 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
5072 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
5073 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
5074 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
5075 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
5076 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
5077 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
5078 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
5079 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
5080 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
5081 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
5082 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
5083 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
5084 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
5085 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
5086 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
5089 Version 1.31.1 (2018-12-20)
5090 ===========================
5092 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
5093 - [Fix broken go-to-definition in RLS][rls/1171]
5094 - [Fix infinite loop on hover in RLS][rls/1170]
5096 [56562]: https://github.com/rust-lang/rust/pull/56562
5097 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
5098 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
5100 Version 1.31.0 (2018-12-06)
5101 ==========================
5105 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
5106 - [New lifetime elision rules now allow for eliding lifetimes in functions and
5107 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
5108 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
5110 - [You can now define and use `const` functions.][54835] These are currently
5111 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
5112 [language reference][const-reference] for what exactly is available.
5113 - [You can now use tool lints, which allow you to scope lints from external
5114 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
5115 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
5116 a crate, not just in exported functions.][54451]
5117 - [You can now use parentheses in pattern matches.][54497]
5121 - [Updated musl to 1.1.20][54430]
5125 - [You can now convert `num::NonZero*` types to their raw equivalents using the
5126 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
5127 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
5128 into `Option<&mut T>` using the `From` trait.][53218]
5129 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
5134 - [`slice::align_to`]
5135 - [`slice::align_to_mut`]
5136 - [`slice::chunks_exact`]
5137 - [`slice::chunks_exact_mut`]
5138 - [`slice::rchunks`]
5139 - [`slice::rchunks_mut`]
5140 - [`slice::rchunks_exact`]
5141 - [`slice::rchunks_exact_mut`]
5142 - [`Option::replace`]
5146 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
5147 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
5148 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
5150 [52813]: https://github.com/rust-lang/rust/pull/52813/
5151 [53218]: https://github.com/rust-lang/rust/pull/53218/
5152 [54057]: https://github.com/rust-lang/rust/pull/54057/
5153 [54240]: https://github.com/rust-lang/rust/pull/54240/
5154 [54430]: https://github.com/rust-lang/rust/pull/54430/
5155 [54451]: https://github.com/rust-lang/rust/pull/54451/
5156 [54497]: https://github.com/rust-lang/rust/pull/54497/
5157 [54778]: https://github.com/rust-lang/rust/pull/54778/
5158 [54835]: https://github.com/rust-lang/rust/pull/54835/
5159 [54870]: https://github.com/rust-lang/rust/pull/54870/
5160 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
5161 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
5162 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
5163 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
5164 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
5165 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
5166 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5167 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
5168 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5169 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
5170 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
5171 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
5172 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
5173 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
5175 Version 1.30.1 (2018-11-08)
5176 ===========================
5178 - [Fixed overflow ICE in rustdoc][54199]
5179 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
5181 [54199]: https://github.com/rust-lang/rust/pull/54199
5182 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
5184 Version 1.30.0 (2018-10-25)
5185 ==========================
5189 - [Procedural macros are now available.][52081] These kinds of macros allow for
5190 more powerful code generation. There is a [new chapter available][proc-macros]
5191 in the Rust Programming Language book that goes further in depth.
5192 - [You can now use keywords as identifiers using the raw identifiers
5193 syntax (`r#`),][53236] e.g. `let r#for = true;`
5194 - [Using anonymous parameters in traits is now deprecated with a warning and
5195 will be a hard error in the 2018 edition.][53272]
5196 - [You can now use `crate` in paths.][54404] This allows you to refer to the
5197 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
5198 - [Using a external crate no longer requires being prefixed with `::`.][54404]
5199 Previously, using a external crate in a module without a use statement
5200 required `let json = ::serde_json::from_str(foo);` but can now be written
5201 as `let json = serde_json::from_str(foo);`.
5202 - [You can now apply the `#[used]` attribute to static items to prevent the
5203 compiler from optimising them away, even if they appear to be unused,][51363]
5204 e.g. `#[used] static FOO: u32 = 1;`
5205 - [You can now import and reexport macros from other crates with the `use`
5206 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5207 the root module of the crate. If your macro relies on calling other local
5208 macros, it is recommended to export with the
5209 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5211 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5212 using the `vis` specifier.][53370]
5213 - [Non-macro attributes now allow all forms of literals, not just
5214 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5215 write `#[attr(true)]`.
5216 - [You can now specify a function to handle a panic in the Rust runtime with the
5217 `#[panic_handler]` attribute.][51366]
5221 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5222 - [Added the `aarch64-unknown-netbsd` target][53165]
5223 - [Upgraded to LLVM 8.][53611]
5227 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5231 - [`Ipv4Addr::BROADCAST`]
5232 - [`Ipv4Addr::LOCALHOST`]
5233 - [`Ipv4Addr::UNSPECIFIED`]
5234 - [`Ipv6Addr::LOCALHOST`]
5235 - [`Ipv6Addr::UNSPECIFIED`]
5236 - [`Iterator::find_map`]
5238 The following methods are replacement methods for `trim_left`, `trim_right`,
5239 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5241 - [`str::trim_end_matches`]
5243 - [`str::trim_start_matches`]
5244 - [`str::trim_start`]
5248 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5249 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5250 equivalent to calling `rustdoc --error-format=json`.
5251 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5255 - [`rustdoc` allows you to specify what edition to treat your code as with the
5256 `--edition` option.][54057]
5257 - [`rustdoc` now has the `--color` (specify whether to output color) and
5258 `--error-format` (specify error format, e.g. `json`) options.][53003]
5259 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5260 debug symbols.][53774]
5261 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5262 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5264 [50911]: https://github.com/rust-lang/rust/pull/50911/
5265 [51363]: https://github.com/rust-lang/rust/pull/51363/
5266 [51366]: https://github.com/rust-lang/rust/pull/51366/
5267 [52081]: https://github.com/rust-lang/rust/pull/52081/
5268 [53003]: https://github.com/rust-lang/rust/pull/53003/
5269 [53033]: https://github.com/rust-lang/rust/pull/53033/
5270 [53044]: https://github.com/rust-lang/rust/pull/53044/
5271 [53165]: https://github.com/rust-lang/rust/pull/53165/
5272 [53611]: https://github.com/rust-lang/rust/pull/53611/
5273 [53236]: https://github.com/rust-lang/rust/pull/53236/
5274 [53272]: https://github.com/rust-lang/rust/pull/53272/
5275 [53370]: https://github.com/rust-lang/rust/pull/53370/
5276 [53459]: https://github.com/rust-lang/rust/pull/53459/
5277 [53774]: https://github.com/rust-lang/rust/pull/53774/
5278 [53822]: https://github.com/rust-lang/rust/pull/53822/
5279 [54057]: https://github.com/rust-lang/rust/pull/54057/
5280 [54404]: https://github.com/rust-lang/rust/pull/54404/
5281 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5282 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5283 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5284 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5286 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5287 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5288 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5289 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5290 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5291 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5292 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5293 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5294 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5295 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5298 Version 1.29.2 (2018-10-11)
5299 ===========================
5301 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5302 - The `rls-preview` component on the windows-gnu targets has been restored.
5304 [54639]: https://github.com/rust-lang/rust/pull/54639
5307 Version 1.29.1 (2018-09-25)
5308 ===========================
5313 - The standard library's `str::repeat` function contained an out of bounds write
5314 caused by an integer overflow. This has been fixed by deterministically
5315 panicking when an overflow happens.
5317 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5321 Version 1.29.0 (2018-09-13)
5322 ==========================
5326 - [Bumped minimum LLVM version to 5.0.][51899]
5327 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5328 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5329 - [Upgraded to LLVM 7.][51966]
5333 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5334 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5335 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5336 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5338 - [`Cell<T>` now allows `T` to be unsized.][50494]
5339 - [`SocketAddr` is now stable on Redox.][52656]
5344 - [`Iterator::flatten`]
5349 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5350 `--locked` to disable this behavior.
5351 - [`cargo-install` will now allow you to cross compile an install
5352 using `--target`.][cargo/5614]
5353 - [Added the `cargo-fix` subcommand to automatically move project code from
5354 2015 edition to 2018.][cargo/5723]
5355 - [`cargo doc` can now optionally document private types using the
5356 `--document-private-items` flag.][cargo/5543]
5360 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5361 the specified level to that level.][52354] For example `--cap-lints warn`
5362 will demote `deny` and `forbid` lints to `warn`.
5363 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5364 fails and `101` if there is a panic.][52197]
5365 - [A preview of clippy has been made available through rustup.][51122]
5366 You can install the preview with `rustup component add clippy-preview`.
5370 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5371 Use `str::get_unchecked(begin..end)` instead.
5372 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5373 Consider using the `home_dir` function from
5374 https://crates.io/crates/dirs instead.
5375 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5376 - [`cfg` attributes and `--cfg` command line flags are now more
5377 strictly validated.][53893]
5379 [53893]: https://github.com/rust-lang/rust/pull/53893/
5380 [52861]: https://github.com/rust-lang/rust/pull/52861/
5381 [51966]: https://github.com/rust-lang/rust/pull/51966/
5382 [52656]: https://github.com/rust-lang/rust/pull/52656/
5383 [52239]: https://github.com/rust-lang/rust/pull/52239/
5384 [52330]: https://github.com/rust-lang/rust/pull/52330/
5385 [52354]: https://github.com/rust-lang/rust/pull/52354/
5386 [52402]: https://github.com/rust-lang/rust/pull/52402/
5387 [52197]: https://github.com/rust-lang/rust/pull/52197/
5388 [51807]: https://github.com/rust-lang/rust/pull/51807/
5389 [51899]: https://github.com/rust-lang/rust/pull/51899/
5390 [51912]: https://github.com/rust-lang/rust/pull/51912/
5391 [51619]: https://github.com/rust-lang/rust/pull/51619/
5392 [51656]: https://github.com/rust-lang/rust/pull/51656/
5393 [51178]: https://github.com/rust-lang/rust/pull/51178/
5394 [51122]: https://github.com/rust-lang/rust/pull/51122
5395 [50494]: https://github.com/rust-lang/rust/pull/50494/
5396 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5397 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5398 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5399 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5400 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5401 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5402 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5405 Version 1.28.0 (2018-08-02)
5406 ===========================
5410 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5411 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5412 the inner type across Foreign Function Interface (FFI) boundaries.
5413 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5414 and can now be used as identifiers.][51196]
5415 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5416 stable.][51241] This will allow users to specify a global allocator for
5418 - [Unit test functions marked with the `#[test]` attribute can now return
5419 `Result<(), E: Debug>` in addition to `()`.][51298]
5420 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5421 allows macros to easily target lifetimes.
5425 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5426 prioritise making smaller binary sizes. `z` is the same as `s` with the
5427 exception that it does not vectorise loops, which typically results in an even
5429 - [The short error format is now stable.][49546] Specified with
5430 `--error-format=short` this option will provide a more compressed output of
5431 rust error messages.
5432 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5433 - [Reduced the number of allocations in the macro parser.][50855] This can
5434 improve compile times of macro heavy crates on average by 5%.
5438 - [Implemented `Default` for `&mut str`.][51306]
5439 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5440 - [Implemented `Extend` for `()`.][50234]
5441 - [The `Debug` implementation of `time::Duration` should now be more easily
5442 human readable.][50364] Previously a `Duration` of one second would printed as
5443 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5444 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5445 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5446 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5447 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5448 for `PathBuf`.][50170]
5449 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5450 and `Wrapping<i128>`.][50465]
5451 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5452 possible.][51050] This can provide up to a 40% speed increase.
5453 - [Improved error messages when using `format!`.][50610]
5457 - [`Iterator::step_by`]
5458 - [`Path::ancestors`]
5459 - [`SystemTime::UNIX_EPOCH`]
5460 - [`alloc::GlobalAlloc`]
5462 - [`alloc::LayoutErr`]
5465 - [`alloc::alloc_zeroed`]
5466 - [`alloc::dealloc`]
5467 - [`alloc::realloc`]
5468 - [`alloc::handle_alloc_error`]
5469 - [`btree_map::Entry::or_default`]
5470 - [`fmt::Alignment`]
5471 - [`hash_map::Entry::or_default`]
5472 - [`iter::repeat_with`]
5473 - [`num::NonZeroUsize`]
5474 - [`num::NonZeroU128`]
5475 - [`num::NonZeroU16`]
5476 - [`num::NonZeroU32`]
5477 - [`num::NonZeroU64`]
5478 - [`num::NonZeroU8`]
5479 - [`ops::RangeBounds`]
5480 - [`slice::SliceIndex`]
5481 - [`slice::from_mut`]
5482 - [`slice::from_ref`]
5483 - [`{Any + Send + Sync}::downcast_mut`]
5484 - [`{Any + Send + Sync}::downcast_ref`]
5485 - [`{Any + Send + Sync}::is`]
5489 - [Cargo will now no longer allow you to publish crates with build scripts that
5490 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5491 considered to be immutable.
5495 - [The `suggestion_applicability` field in `rustc`'s json output is now
5496 stable.][50486] This will allow dev tools to check whether a code suggestion
5497 would apply to them.
5501 - [Rust will consider trait objects with duplicated constraints to be the same
5502 type as without the duplicated constraint.][51276] For example the below code will
5503 now fail to compile.
5508 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5511 impl Trait + Send + Send {
5512 fn test(&self) { println!("two"); }
5516 [49546]: https://github.com/rust-lang/rust/pull/49546/
5517 [50143]: https://github.com/rust-lang/rust/pull/50143/
5518 [50170]: https://github.com/rust-lang/rust/pull/50170/
5519 [50234]: https://github.com/rust-lang/rust/pull/50234/
5520 [50265]: https://github.com/rust-lang/rust/pull/50265/
5521 [50364]: https://github.com/rust-lang/rust/pull/50364/
5522 [50385]: https://github.com/rust-lang/rust/pull/50385/
5523 [50465]: https://github.com/rust-lang/rust/pull/50465/
5524 [50486]: https://github.com/rust-lang/rust/pull/50486/
5525 [50554]: https://github.com/rust-lang/rust/pull/50554/
5526 [50610]: https://github.com/rust-lang/rust/pull/50610/
5527 [50855]: https://github.com/rust-lang/rust/pull/50855/
5528 [51050]: https://github.com/rust-lang/rust/pull/51050/
5529 [51196]: https://github.com/rust-lang/rust/pull/51196/
5530 [51241]: https://github.com/rust-lang/rust/pull/51241/
5531 [51276]: https://github.com/rust-lang/rust/pull/51276/
5532 [51298]: https://github.com/rust-lang/rust/pull/51298/
5533 [51306]: https://github.com/rust-lang/rust/pull/51306/
5534 [51562]: https://github.com/rust-lang/rust/pull/51562/
5535 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5536 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5537 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5538 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5539 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5540 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5541 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5542 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5543 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5544 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5545 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5546 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5547 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5548 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5549 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5550 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5551 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5552 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5553 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5554 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5555 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5556 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5557 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5558 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5559 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5560 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5561 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5562 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5563 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5564 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5566 Version 1.27.2 (2018-07-20)
5567 ===========================
5572 - The borrow checker was fixed to avoid potential unsoundness when using
5573 match ergonomics: [#52213][52213].
5575 [52213]: https://github.com/rust-lang/rust/issues/52213
5577 Version 1.27.1 (2018-07-10)
5578 ===========================
5583 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5584 when running, which enabled executing code as some other user on a
5585 given machine. This release fixes that vulnerability; you can read
5586 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5588 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5593 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5594 match ergonomics: [#51415][51415], [#49534][49534].
5596 [51415]: https://github.com/rust-lang/rust/issues/51415
5597 [49534]: https://github.com/rust-lang/rust/issues/49534
5598 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5599 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5601 Version 1.27.0 (2018-06-21)
5602 ==========================
5606 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5607 be used as an identifier.
5608 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5609 bare `Trait` syntax, and should make it clearer when being used in tandem with
5610 `impl Trait` because it is equivalent to the following syntax:
5611 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5612 `Box<Trait> == Box<dyn Trait>`.
5613 - [Attributes on generic parameters such as types and lifetimes are
5614 now stable.][48851] e.g.
5615 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5616 - [The `#[must_use]` attribute can now also be used on functions as well as
5617 types.][48925] It provides a lint that by default warns users when the
5618 value returned by a function has not been used.
5622 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5626 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5627 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5628 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5629 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5630 the `cfg` attribute.
5631 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5632 std are now available in core.][49896]
5633 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5635 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5636 that the operation isn't done in place.
5637 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5638 the `#[must_use]` attribute][49533] to warn about unused potentially
5639 expensive allocations.
5643 - [`DoubleEndedIterator::rfind`]
5644 - [`DoubleEndedIterator::rfold`]
5645 - [`DoubleEndedIterator::try_rfold`]
5646 - [`Duration::from_micros`]
5647 - [`Duration::from_nanos`]
5648 - [`Duration::subsec_micros`]
5649 - [`Duration::subsec_millis`]
5650 - [`HashMap::remove_entry`]
5651 - [`Iterator::try_fold`]
5652 - [`Iterator::try_for_each`]
5654 - [`Option::filter`]
5655 - [`String::replace_range`]
5656 - [`Take::set_limit`]
5657 - [`hint::unreachable_unchecked`]
5658 - [`os::unix::process::parent_id`]
5659 - [`ptr::swap_nonoverlapping`]
5660 - [`slice::rsplit_mut`]
5662 - [`slice::swap_with_slice`]
5666 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5667 `readme`, and `repository` fields.][cargo/5386]
5668 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5669 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5670 a different directory than `target` for placing compilation artifacts.
5671 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5672 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5673 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5674 where cargo would infer a binary, Cargo will produce a warning. You can
5675 disable this feature ahead of time by setting any of the following to false:
5676 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5677 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5678 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5682 - [Added “The Rustc book” into the official documentation.][49707]
5683 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5684 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5688 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5689 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5690 compile, `"".is_empty()` will still compile.
5691 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5692 will only print the inner type.][48553] E.g.
5693 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5694 not `AtomicBool(true)`.
5695 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5696 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5697 alignment should cover all use cases.
5698 - The `.description()` method on the `std::error::Error` trait
5699 [has been soft-deprecated][50163]. It is no longer required to implement it.
5701 [48553]: https://github.com/rust-lang/rust/pull/48553/
5702 [48851]: https://github.com/rust-lang/rust/pull/48851/
5703 [48925]: https://github.com/rust-lang/rust/pull/48925/
5704 [49533]: https://github.com/rust-lang/rust/pull/49533/
5705 [49623]: https://github.com/rust-lang/rust/pull/49623/
5706 [49630]: https://github.com/rust-lang/rust/pull/49630/
5707 [49664]: https://github.com/rust-lang/rust/pull/49664/
5708 [49699]: https://github.com/rust-lang/rust/pull/49699/
5709 [49707]: https://github.com/rust-lang/rust/pull/49707/
5710 [49896]: https://github.com/rust-lang/rust/pull/49896/
5711 [49968]: https://github.com/rust-lang/rust/pull/49968/
5712 [50163]: https://github.com/rust-lang/rust/pull/50163
5713 [50177]: https://github.com/rust-lang/rust/pull/50177/
5714 [50378]: https://github.com/rust-lang/rust/pull/50378/
5715 [50423]: https://github.com/rust-lang/rust/pull/50423/
5716 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5717 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5718 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5719 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5720 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5721 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5722 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5723 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5724 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5725 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5726 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5727 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5728 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5729 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5730 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5731 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5732 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5733 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5734 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5735 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5736 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5737 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5738 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5739 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5740 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5741 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5742 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5743 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5744 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5747 Version 1.26.2 (2018-06-05)
5748 ==========================
5753 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5755 [51117]: https://github.com/rust-lang/rust/issues/51117
5758 Version 1.26.1 (2018-05-29)
5759 ==========================
5764 - [RLS now works on Windows.][50646]
5765 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5771 - [`fn main() -> impl Trait` no longer works for non-Termination
5773 This reverts an accidental stabilization.
5774 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5775 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5777 [50646]: https://github.com/rust-lang/rust/issues/50646
5778 [50656]: https://github.com/rust-lang/rust/pull/50656
5779 [50812]: https://github.com/rust-lang/rust/pull/50812
5780 [50950]: https://github.com/rust-lang/rust/issues/50950
5781 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5783 Version 1.26.0 (2018-05-10)
5784 ==========================
5788 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5789 implement either or both traits.][49299]
5790 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5791 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5792 lifetime can be elided.][49458]
5793 - [`impl Trait` is now stable allowing you to have abstract types in returns
5794 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5795 `fn open(path: impl AsRef<Path>)`.
5796 - [Pattern matching will now automatically apply dereferences.][49394]
5797 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5798 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5799 - [A lot of operations are now available in a const context.][46882] E.g. You
5800 can now index into constant arrays, reference and dereference into constants,
5801 and use tuple struct constructors.
5802 - [Fixed entry slice patterns are now stable.][48516] E.g.
5804 let points = [1, 2, 3, 4];
5806 [1, 2, 3, 4] => println!("All points were sequential."),
5807 _ => println!("Not all points were sequential."),
5814 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5815 - [Fixed exponential projection complexity on nested types.][48296]
5816 This can provide up to a ~12% reduction in compile times for certain crates.
5817 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5818 to remap path prefixes outputted by the compiler.
5819 - [Added `powerpc-unknown-netbsd` target.][48281]
5823 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5824 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5825 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5826 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5827 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5828 - [`ascii::escape_default` is now available in libcore.][48735]
5829 - [Trailing commas are now supported in std and core macros.][48056]
5830 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5831 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5836 - [`*const T::copy_to_nonoverlapping`]
5837 - [`*const T::copy_to`]
5838 - [`*const T::read_unaligned`]
5839 - [`*const T::read_volatile`]
5840 - [`*const T::read`]
5842 - [`*const T::wrapping_add`]
5843 - [`*const T::wrapping_sub`]
5845 - [`*mut T::copy_to_nonoverlapping`]
5846 - [`*mut T::copy_to`]
5847 - [`*mut T::read_unaligned`]
5848 - [`*mut T::read_volatile`]
5850 - [`*mut T::replace`]
5853 - [`*mut T::wrapping_add`]
5854 - [`*mut T::wrapping_sub`]
5855 - [`*mut T::write_bytes`]
5856 - [`*mut T::write_unaligned`]
5857 - [`*mut T::write_volatile`]
5860 - [`FromUtf8Error::as_bytes`]
5861 - [`LocalKey::try_with`]
5862 - [`Option::cloned`]
5863 - [`btree_map::Entry::and_modify`]
5864 - [`fs::read_to_string`]
5867 - [`hash_map::Entry::and_modify`]
5868 - [`iter::FusedIterator`]
5869 - [`ops::RangeInclusive`]
5870 - [`ops::RangeToInclusive`]
5872 - [`slice::rotate_left`]
5873 - [`slice::rotate_right`]
5874 - [`String::retain`]
5879 - [Cargo will now output path to custom commands when `-v` is
5880 passed with `--list`][cargo/5041]
5881 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5885 - [The second edition of "The Rust Programming Language" book is now recommended
5886 over the first.][48404]
5891 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5892 syntax is now invalid.
5894 use std::ops::Fn as dyn;
5895 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5897 - [The result of dereferences are no longer promoted to `'static`.][47408]
5901 const PAIR: &(i32, i32) = &(0, 1);
5902 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5905 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5906 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5908 - [Removed hoedown from rustdoc.][48274]
5909 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5911 [46882]: https://github.com/rust-lang/rust/pull/46882
5912 [47379]: https://github.com/rust-lang/rust/pull/47379
5913 [47408]: https://github.com/rust-lang/rust/pull/47408
5914 [47813]: https://github.com/rust-lang/rust/pull/47813
5915 [48056]: https://github.com/rust-lang/rust/pull/48056
5916 [48125]: https://github.com/rust-lang/rust/pull/48125
5917 [48235]: https://github.com/rust-lang/rust/pull/48235
5918 [48274]: https://github.com/rust-lang/rust/pull/48274
5919 [48281]: https://github.com/rust-lang/rust/pull/48281
5920 [48296]: https://github.com/rust-lang/rust/pull/48296
5921 [48326]: https://github.com/rust-lang/rust/pull/48326
5922 [48359]: https://github.com/rust-lang/rust/pull/48359
5923 [48404]: https://github.com/rust-lang/rust/pull/48404
5924 [48481]: https://github.com/rust-lang/rust/pull/48481
5925 [48516]: https://github.com/rust-lang/rust/pull/48516
5926 [48628]: https://github.com/rust-lang/rust/pull/48628
5927 [48629]: https://github.com/rust-lang/rust/pull/48629
5928 [48657]: https://github.com/rust-lang/rust/pull/48657
5929 [48735]: https://github.com/rust-lang/rust/pull/48735
5930 [48978]: https://github.com/rust-lang/rust/pull/48978
5931 [49101]: https://github.com/rust-lang/rust/pull/49101
5932 [49109]: https://github.com/rust-lang/rust/pull/49109
5933 [49162]: https://github.com/rust-lang/rust/pull/49162
5934 [49255]: https://github.com/rust-lang/rust/pull/49255
5935 [49299]: https://github.com/rust-lang/rust/pull/49299
5936 [49305]: https://github.com/rust-lang/rust/pull/49305
5937 [49394]: https://github.com/rust-lang/rust/pull/49394
5938 [49458]: https://github.com/rust-lang/rust/pull/49458
5939 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5940 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5941 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5942 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5943 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5944 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5945 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5946 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5947 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5948 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5949 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5950 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5951 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5952 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5953 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5954 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5955 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5956 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5957 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5958 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5959 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5960 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5961 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5962 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5963 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5964 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5965 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5966 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5967 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5968 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5969 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5970 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5971 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5972 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5973 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5974 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5975 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5976 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5977 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5978 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5979 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5980 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5983 Version 1.25.0 (2018-03-29)
5984 ==========================
5988 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5989 - [You can now use nested groups of imports.][47948]
5990 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5991 - [You can now have `|` at the start of a match arm.][47947] e.g.
5993 enum Foo { A, B, C }
5999 | Foo::B => println!("AB"),
6000 | Foo::C => println!("C"),
6007 - [Upgraded to LLVM 6.][47828]
6008 - [Added `-C lto=val` option.][47521]
6009 - [Added `i586-unknown-linux-musl` target][47282]
6013 - [Impl Send for `process::Command` on Unix.][47760]
6014 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
6015 - [`UnsafeCell::into_inner` is now safe.][47204]
6016 - [Implement libstd for CloudABI.][47268]
6017 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
6018 - [Implement `AsRef<Path>` for Component][46985]
6019 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
6020 - [Moved `Duration` to libcore.][46666]
6024 - [`Location::column`]
6027 The following functions can now be used in a constant expression.
6028 eg. `static MINUTE: Duration = Duration::from_secs(60);`
6029 - [`Duration::new`][47300]
6030 - [`Duration::from_secs`][47300]
6031 - [`Duration::from_millis`][47300]
6035 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
6036 - [`cargo new` now defaults to creating a binary crate, instead of a
6037 library crate.][cargo/5029]
6041 - [Rust by example is now shipped with new releases][46196]
6045 - [Deprecated `net::lookup_host`.][47510]
6046 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
6047 - The borrow checker was sometimes incorrectly permitting overlapping borrows
6048 around indexing operations (see [#47349][47349]). This has been fixed (which also
6049 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
6050 - [Removed deprecated unstable attribute `#[simd]`.][47251]
6052 [33903]: https://github.com/rust-lang/rust/pull/33903
6053 [47947]: https://github.com/rust-lang/rust/pull/47947
6054 [47948]: https://github.com/rust-lang/rust/pull/47948
6055 [47760]: https://github.com/rust-lang/rust/pull/47760
6056 [47790]: https://github.com/rust-lang/rust/pull/47790
6057 [47828]: https://github.com/rust-lang/rust/pull/47828
6058 [47398]: https://github.com/rust-lang/rust/pull/47398
6059 [47510]: https://github.com/rust-lang/rust/pull/47510
6060 [47521]: https://github.com/rust-lang/rust/pull/47521
6061 [47204]: https://github.com/rust-lang/rust/pull/47204
6062 [47251]: https://github.com/rust-lang/rust/pull/47251
6063 [47268]: https://github.com/rust-lang/rust/pull/47268
6064 [47282]: https://github.com/rust-lang/rust/pull/47282
6065 [47300]: https://github.com/rust-lang/rust/pull/47300
6066 [47349]: https://github.com/rust-lang/rust/pull/47349
6067 [46931]: https://github.com/rust-lang/rust/pull/46931
6068 [46985]: https://github.com/rust-lang/rust/pull/46985
6069 [47006]: https://github.com/rust-lang/rust/pull/47006
6070 [46830]: https://github.com/rust-lang/rust/pull/46830
6071 [46095]: https://github.com/rust-lang/rust/pull/46095
6072 [46666]: https://github.com/rust-lang/rust/pull/46666
6073 [46196]: https://github.com/rust-lang/rust/pull/46196
6074 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
6075 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
6076 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
6077 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
6078 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
6081 Version 1.24.1 (2018-03-01)
6082 ==========================
6084 - [Do not abort when unwinding through FFI][48251]
6085 - [Emit UTF-16 files for linker arguments on Windows][48318]
6086 - [Make the error index generator work again][48308]
6087 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
6089 [48251]: https://github.com/rust-lang/rust/issues/48251
6090 [48308]: https://github.com/rust-lang/rust/issues/48308
6091 [48318]: https://github.com/rust-lang/rust/issues/48318
6092 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
6095 Version 1.24.0 (2018-02-15)
6096 ==========================
6100 - [External `sysv64` ffi is now available.][46528]
6101 eg. `extern "sysv64" fn foo () {}`
6105 - [rustc now uses 16 codegen units by default for release builds.][46910]
6106 For the fastest builds, utilize `codegen-units=1`.
6107 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
6108 - [Add `aarch64-unknown-openbsd` support][46760]
6112 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
6113 improvement in performance in the majority of cases.
6114 - [`OsStr`'s `Debug` implementation is now lossless and consistent
6115 with Windows.][46798]
6116 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
6117 - [impl `From<bool>` for `AtomicBool`][46293]
6118 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
6119 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
6120 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
6121 - [float::from_bits now just uses transmute.][46012] This provides
6122 some optimisations from LLVM.
6123 - [Copied `AsciiExt` methods onto `char`][46077]
6124 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
6125 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
6126 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
6127 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
6131 - [`RefCell::replace`]
6133 - [`atomic::spin_loop_hint`]
6135 The following functions can now be used in a constant expression.
6136 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
6138 - [`AtomicBool::new`][46287]
6139 - [`AtomicUsize::new`][46287]
6140 - [`AtomicIsize::new`][46287]
6141 - [`AtomicPtr::new`][46287]
6142 - [`Cell::new`][46287]
6143 - [`{integer}::min_value`][46287]
6144 - [`{integer}::max_value`][46287]
6145 - [`mem::size_of`][46287]
6146 - [`mem::align_of`][46287]
6147 - [`ptr::null`][46287]
6148 - [`ptr::null_mut`][46287]
6149 - [`RefCell::new`][46287]
6150 - [`UnsafeCell::new`][46287]
6154 - [Added a `workspace.default-members` config that
6155 overrides implied `--all` in virtual workspaces.][cargo/4743]
6156 - [Enable incremental by default on development builds.][cargo/4817] Also added
6157 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
6158 per-project or global basis respectively.
6165 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
6166 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
6167 in accordance with IETF RFC 4291 §2.2.
6168 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
6169 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
6170 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
6171 - [Leading zeros in tuple struct members is now an error][47084]
6172 - [`column!()` macro is one-based instead of zero-based][46977]
6173 - [`fmt::Arguments` can no longer be shared across threads][45198]
6174 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
6175 - [Cargo sets a different working directory for the compiler][cargo/4788]
6177 [44884]: https://github.com/rust-lang/rust/pull/44884
6178 [45198]: https://github.com/rust-lang/rust/pull/45198
6179 [45506]: https://github.com/rust-lang/rust/pull/45506
6180 [45990]: https://github.com/rust-lang/rust/pull/45990
6181 [46012]: https://github.com/rust-lang/rust/pull/46012
6182 [46077]: https://github.com/rust-lang/rust/pull/46077
6183 [46094]: https://github.com/rust-lang/rust/pull/46094
6184 [46284]: https://github.com/rust-lang/rust/pull/46284
6185 [46287]: https://github.com/rust-lang/rust/pull/46287
6186 [46293]: https://github.com/rust-lang/rust/pull/46293
6187 [46528]: https://github.com/rust-lang/rust/pull/46528
6188 [46671]: https://github.com/rust-lang/rust/pull/46671
6189 [46713]: https://github.com/rust-lang/rust/pull/46713
6190 [46735]: https://github.com/rust-lang/rust/pull/46735
6191 [46760]: https://github.com/rust-lang/rust/pull/46760
6192 [46798]: https://github.com/rust-lang/rust/pull/46798
6193 [46828]: https://github.com/rust-lang/rust/pull/46828
6194 [46831]: https://github.com/rust-lang/rust/pull/46831
6195 [46833]: https://github.com/rust-lang/rust/pull/46833
6196 [46910]: https://github.com/rust-lang/rust/pull/46910
6197 [46977]: https://github.com/rust-lang/rust/pull/46977
6198 [47018]: https://github.com/rust-lang/rust/pull/47018
6199 [47080]: https://github.com/rust-lang/rust/pull/47080
6200 [47084]: https://github.com/rust-lang/rust/pull/47084
6201 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6202 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6203 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6204 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6205 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6206 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6209 Version 1.23.0 (2018-01-04)
6210 ==========================
6214 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6215 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6216 Which should fix some confusing errors in some operations.
6220 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6221 undefined behavior.][45920]
6222 - [rustc now suggests renaming import if names clash.][45660]
6223 - [Display errors/warnings correctly when there are zero-width or
6224 wide characters.][45711]
6225 - [rustc now avoids unnecessary copies of arguments that are
6226 simple bindings][45380] This should improve memory usage on average by 5-10%.
6227 - [Updated musl used to build musl rustc to 1.1.17][45393]
6231 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6232 - [Implement Hash for raw pointers to unsized types][45483]
6233 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6234 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6235 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6236 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6237 and `<*mut T>::as_mut`][44932]
6238 - [Optimized `Thread::{park, unpark}` implementation][45524]
6239 - [Improved `SliceExt::binary_search` performance.][45333]
6240 - [impl `FromIterator<()>` for `()`][45379]
6241 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6249 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6250 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6251 - [Added unit test checking to `cargo check`][cargo/4592]
6252 - [Cargo now lets you install a specific version
6253 using `cargo install --version`][cargo/4637]
6257 - [Releases now ship with the Cargo book documentation.][45692]
6258 - [rustdoc now prints rendering warnings on every run.][45324]
6262 - [Changes have been made to type equality to make it more correct,
6263 in rare cases this could break some code.][45853] [Tracking issue for
6264 further information][45852]
6265 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6266 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6267 Android 9, the minimum supported version is Android 14.
6268 - [Bumped the minimum LLVM to 3.9][45326]
6270 [44042]: https://github.com/rust-lang/rust/pull/44042
6271 [44932]: https://github.com/rust-lang/rust/pull/44932
6272 [45267]: https://github.com/rust-lang/rust/pull/45267
6273 [45324]: https://github.com/rust-lang/rust/pull/45324
6274 [45326]: https://github.com/rust-lang/rust/pull/45326
6275 [45333]: https://github.com/rust-lang/rust/pull/45333
6276 [45379]: https://github.com/rust-lang/rust/pull/45379
6277 [45380]: https://github.com/rust-lang/rust/pull/45380
6278 [45393]: https://github.com/rust-lang/rust/pull/45393
6279 [45435]: https://github.com/rust-lang/rust/pull/45435
6280 [45483]: https://github.com/rust-lang/rust/pull/45483
6281 [45524]: https://github.com/rust-lang/rust/pull/45524
6282 [45571]: https://github.com/rust-lang/rust/pull/45571
6283 [45580]: https://github.com/rust-lang/rust/pull/45580
6284 [45610]: https://github.com/rust-lang/rust/pull/45610
6285 [45660]: https://github.com/rust-lang/rust/pull/45660
6286 [45692]: https://github.com/rust-lang/rust/pull/45692
6287 [45711]: https://github.com/rust-lang/rust/pull/45711
6288 [45772]: https://github.com/rust-lang/rust/pull/45772
6289 [45852]: https://github.com/rust-lang/rust/issues/45852
6290 [45853]: https://github.com/rust-lang/rust/pull/45853
6291 [45887]: https://github.com/rust-lang/rust/pull/45887
6292 [45920]: https://github.com/rust-lang/rust/pull/45920
6293 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6294 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6295 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6298 Version 1.22.1 (2017-11-22)
6299 ==========================
6301 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6303 [46183]: https://github.com/rust-lang/rust/pull/46183
6305 Version 1.22.0 (2017-11-22)
6306 ==========================
6310 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6311 - [Now accepts underscores in unicode escapes][43716]
6312 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6313 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6317 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6318 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6319 This should decrease compile times for debug builds.
6320 - [strict memory alignment now enabled on ARMv6][45094]
6321 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6325 - [Allow atomic operations up to 32 bits
6326 on `armv5te_unknown_linux_gnueabi`][44978]
6327 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6328 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6329 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6330 - [Properly detect overflow in `Instant += Duration`.][44220]
6331 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6332 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6333 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6340 - [Cargo will now build multi file examples in subdirectories of the `examples`
6341 folder that have a `main.rs` file.][cargo/4496]
6342 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6343 the old format will continue to work and can be updated with `cargo update`.
6344 - [Now supports vendoring git repositories][cargo/3992]
6348 - [`libbacktrace` is now available on Apple platforms.][44251]
6349 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6350 This now lets you specify that a given code example will fail to compile.
6354 - [The minimum Android version that rustc can build for has been bumped
6355 to `4.0` from `2.3`][45656]
6356 - [Allowing `T op= &T` for numeric types has broken some type
6357 inference cases][45480]
6360 [42526]: https://github.com/rust-lang/rust/pull/42526
6361 [43716]: https://github.com/rust-lang/rust/pull/43716
6362 [43949]: https://github.com/rust-lang/rust/pull/43949
6363 [44015]: https://github.com/rust-lang/rust/pull/44015
6364 [44220]: https://github.com/rust-lang/rust/pull/44220
6365 [44251]: https://github.com/rust-lang/rust/pull/44251
6366 [44287]: https://github.com/rust-lang/rust/pull/44287
6367 [44303]: https://github.com/rust-lang/rust/pull/44303
6368 [44456]: https://github.com/rust-lang/rust/pull/44456
6369 [44466]: https://github.com/rust-lang/rust/pull/44466
6370 [44895]: https://github.com/rust-lang/rust/pull/44895
6371 [44966]: https://github.com/rust-lang/rust/pull/44966
6372 [44978]: https://github.com/rust-lang/rust/pull/44978
6373 [45041]: https://github.com/rust-lang/rust/pull/45041
6374 [45064]: https://github.com/rust-lang/rust/pull/45064
6375 [45075]: https://github.com/rust-lang/rust/pull/45075
6376 [45094]: https://github.com/rust-lang/rust/pull/45094
6377 [45095]: https://github.com/rust-lang/rust/pull/45095
6378 [45480]: https://github.com/rust-lang/rust/issues/45480
6379 [45656]: https://github.com/rust-lang/rust/pull/45656
6380 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6381 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6382 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6389 Version 1.21.0 (2017-10-12)
6390 ==========================
6394 - [You can now use static references for literals.][43838]
6398 let x: &'static u32 = &0;
6401 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6404 my_macro!(Vec<i32>::new); // Always worked
6405 my_macro!(Vec::<i32>::new); // Now works
6410 - [Upgraded jemalloc to 4.5.0][43911]
6411 - [Enabled unwinding panics on Redox][43917]
6412 - [Now runs LLVM in parallel during translation phase.][43506]
6413 This should reduce peak memory usage.
6417 - [Generate builtin impls for `Clone` for all arrays and tuples that
6418 are `T: Clone`][43690]
6419 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6420 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6421 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6426 [`std::mem::discriminant`]
6430 - [You can now call `cargo install` with multiple package names][cargo/4216]
6431 - [Cargo commands inside a virtual workspace will now implicitly
6432 pass `--all`][cargo/4335]
6433 - [Added a `[patch]` section to `Cargo.toml` to handle
6434 prepublication dependencies][cargo/4123] [RFC 1969]
6435 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6436 like patterns][cargo/4270]
6437 - [Added the `--all-targets` option][cargo/4400]
6438 - [Using required dependencies as a feature is now deprecated and emits
6439 a warning][cargo/4364]
6444 - [Cargo docs are moving][43916]
6445 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6446 - [The rustdoc book is now available][43863]
6447 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6448 - [Added a preview of RLS has been made available through rustup][44204]
6449 Install with `rustup component add rls-preview`
6450 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6451 Previously only showed `std::os::unix`.
6455 - [Changes in method matching against higher-ranked types][43880] This may cause
6456 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6457 - [rustc's JSON error output's byte position start at top of file.][42973]
6458 Was previously relative to the rustc's internal `CodeMap` struct which
6459 required the unstable library `libsyntax` to correctly use.
6460 - [`unused_results` lint no longer ignores booleans][43728]
6462 [42565]: https://github.com/rust-lang/rust/pull/42565
6463 [42973]: https://github.com/rust-lang/rust/pull/42973
6464 [43348]: https://github.com/rust-lang/rust/pull/43348
6465 [43459]: https://github.com/rust-lang/rust/pull/43459
6466 [43506]: https://github.com/rust-lang/rust/pull/43506
6467 [43540]: https://github.com/rust-lang/rust/pull/43540
6468 [43690]: https://github.com/rust-lang/rust/pull/43690
6469 [43728]: https://github.com/rust-lang/rust/pull/43728
6470 [43838]: https://github.com/rust-lang/rust/pull/43838
6471 [43863]: https://github.com/rust-lang/rust/pull/43863
6472 [43880]: https://github.com/rust-lang/rust/pull/43880
6473 [43911]: https://github.com/rust-lang/rust/pull/43911
6474 [43916]: https://github.com/rust-lang/rust/pull/43916
6475 [43917]: https://github.com/rust-lang/rust/pull/43917
6476 [44204]: https://github.com/rust-lang/rust/pull/44204
6477 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6478 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6479 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6480 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6481 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6482 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6483 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6484 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6485 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6487 Version 1.20.0 (2017-08-31)
6488 ===========================
6492 - [Associated constants are now stabilised.][42809]
6493 - [A lot of macro bugs are now fixed.][42913]
6498 - [Struct fields are now properly coerced to the expected field type.][42807]
6499 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6500 `wasm32-experimental-emscripten` target.
6501 - [Changed some of the error messages to be more helpful.][42033]
6502 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6504 - [rustc now reports the total number of errors on compilation failure][43015]
6505 previously this was only the number of errors in the pass that failed.
6506 - [Expansion in rustc has been sped up 29x.][42533]
6507 - [added `msp430-none-elf` target.][43099]
6508 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6510 - [Fixes backtraces on Redox][43228]
6511 - [rustc now identifies different versions of same crate when absolute paths of
6512 different types match in an error message.][42826]
6518 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6519 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6521 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6522 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6523 - [Impl `Clone` for `DefaultHasher`.][42799]
6524 - [Impl `Sync` for `SyncSender`.][42397]
6525 - [Impl `FromStr` for `char`][42271]
6526 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6528 - [allow messages in the `unimplemented!()` macro.][42155]
6529 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6530 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6531 - [Upgrade to Unicode 10.0.0][42999]
6532 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6533 - [Skip the main thread's manual stack guard on Linux][43072]
6534 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6535 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6537 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6542 - [`CStr::into_c_string`]
6543 - [`CString::as_c_str`]
6544 - [`CString::into_boxed_c_str`]
6545 - [`Chain::get_mut`]
6546 - [`Chain::get_ref`]
6547 - [`Chain::into_inner`]
6548 - [`Option::get_or_insert_with`]
6549 - [`Option::get_or_insert`]
6550 - [`OsStr::into_os_string`]
6551 - [`OsString::into_boxed_os_str`]
6554 - [`Utf8Error::error_len`]
6555 - [`char::EscapeDebug`]
6556 - [`char::escape_debug`]
6557 - [`compile_error!`]
6558 - [`f32::from_bits`]
6560 - [`f64::from_bits`]
6562 - [`mem::ManuallyDrop`]
6563 - [`slice::sort_unstable_by_key`]
6564 - [`slice::sort_unstable_by`]
6565 - [`slice::sort_unstable`]
6566 - [`str::from_boxed_utf8_unchecked`]
6567 - [`str::as_bytes_mut`]
6568 - [`str::as_bytes_mut`]
6569 - [`str::from_utf8_mut`]
6570 - [`str::from_utf8_unchecked_mut`]
6572 - [`str::get_unchecked_mut`]
6573 - [`str::get_unchecked`]
6575 - [`str::into_boxed_bytes`]
6580 - [Cargo API token location moved from `~/.cargo/config` to
6581 `~/.cargo/credentials`.][cargo/3978]
6582 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6583 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6584 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6585 - [You can now specify version of a binary when installed through
6586 `cargo install` using `--vers`.][cargo/4229]
6587 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6588 failure.][cargo/4248]
6589 - [Changed the convention around which file is the crate root.][cargo/4259]
6594 - [Functions with `'static` in their return types will now not be as usable as
6595 if they were using lifetime parameters instead.][42417]
6596 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6597 takes the sign of NaN into account where previously didn't.][42430]
6599 [42033]: https://github.com/rust-lang/rust/pull/42033
6600 [42155]: https://github.com/rust-lang/rust/pull/42155
6601 [42271]: https://github.com/rust-lang/rust/pull/42271
6602 [42397]: https://github.com/rust-lang/rust/pull/42397
6603 [42417]: https://github.com/rust-lang/rust/pull/42417
6604 [42430]: https://github.com/rust-lang/rust/pull/42430
6605 [42431]: https://github.com/rust-lang/rust/pull/42431
6606 [42533]: https://github.com/rust-lang/rust/pull/42533
6607 [42571]: https://github.com/rust-lang/rust/pull/42571
6608 [42613]: https://github.com/rust-lang/rust/pull/42613
6609 [42799]: https://github.com/rust-lang/rust/pull/42799
6610 [42807]: https://github.com/rust-lang/rust/pull/42807
6611 [42809]: https://github.com/rust-lang/rust/pull/42809
6612 [42822]: https://github.com/rust-lang/rust/pull/42822
6613 [42826]: https://github.com/rust-lang/rust/pull/42826
6614 [42854]: https://github.com/rust-lang/rust/pull/42854
6615 [42913]: https://github.com/rust-lang/rust/pull/42913
6616 [42999]: https://github.com/rust-lang/rust/pull/42999
6617 [43011]: https://github.com/rust-lang/rust/pull/43011
6618 [43015]: https://github.com/rust-lang/rust/pull/43015
6619 [43072]: https://github.com/rust-lang/rust/pull/43072
6620 [43077]: https://github.com/rust-lang/rust/pull/43077
6621 [43097]: https://github.com/rust-lang/rust/pull/43097
6622 [43099]: https://github.com/rust-lang/rust/pull/43099
6623 [43170]: https://github.com/rust-lang/rust/pull/43170
6624 [43178]: https://github.com/rust-lang/rust/pull/43178
6625 [43185]: https://github.com/rust-lang/rust/pull/43185
6626 [43228]: https://github.com/rust-lang/rust/pull/43228
6627 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6628 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6629 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6630 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6631 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6632 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6633 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6634 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6635 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6636 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6637 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6638 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6639 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6640 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6641 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6642 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6643 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6644 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6645 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6646 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6647 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6648 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6649 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6650 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6651 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6652 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6653 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6654 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6655 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6656 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6657 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6658 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6659 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6660 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6661 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6662 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6663 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6664 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6667 Version 1.19.0 (2017-07-20)
6668 ===========================
6673 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6674 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6675 - [Macro recursion limit increased to 1024 from 64.][41676]
6676 - [Added lint for detecting unused macros.][41907]
6677 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6678 For example: `let x = loop { break 7; };`
6679 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6680 contain `Copy` types and cannot have a `Drop` implementation.
6681 Example: `union Foo { bar: u8, baz: usize }`
6682 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6683 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6688 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6689 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6690 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6691 you should use `--target armv7-linux-androideabi`.
6692 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6693 - [Minor optimisation of string operations.][42037]
6694 - [Compiler error message is now `aborting due to previous error(s)` instead of
6695 `aborting due to N previous errors`][42150] This was previously inaccurate and
6696 would only count certain kinds of errors.
6697 - [The compiler now supports Visual Studio 2017][42225]
6698 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6699 - [Added a lot][42264] of [new error codes][42302]
6700 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6701 libraries with C Run-time Libraries(CRT) to be statically linked.
6702 - [Fixed various ARM codegen bugs][42740]
6707 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6708 `Extend<Cow<'a, str>>`][41449]
6709 - [`Vec` now implements `From<&mut [T]>`][41530]
6710 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6711 - [`SplitWhitespace` now implements `Clone`][41659]
6712 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6714 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6715 macros, but for printing to stderr.
6720 - [`OsString::shrink_to_fit`]
6723 - [`thread::ThreadId`]
6728 - [Build scripts can now add environment variables to the environment
6729 the crate is being compiled in.
6730 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6731 - [Subcommands now replace the current process rather than spawning a new
6732 child process][cargo/3970]
6733 - [Workspace members can now accept glob file patterns][cargo/3979]
6734 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6735 the members in a given workspace.][cargo/3988]
6736 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6737 - [Target directory path is now in the cargo metadata][cargo/4022]
6738 - [Cargo no longer checks out a local working directory for the
6739 crates.io index][cargo/4026] This should provide smaller file size for the
6740 registry, and improve cloning times, especially on Windows machines.
6741 - [Added an `--exclude` option for excluding certain packages when using the
6742 `--all` option][cargo/4031]
6743 - [Cargo will now automatically retry when receiving a 5xx error
6744 from crates.io][cargo/4032]
6745 - [The `--features` option now accepts multiple comma or space
6746 delimited values.][cargo/4084]
6747 - [Added support for custom target specific runners][cargo/3954]
6752 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6754 - [Rust will now release XZ compressed packages][rust-installer/57]
6755 - [rustup will now prefer to download rust packages with
6756 XZ compression][rustup/1100] over GZip packages.
6757 - [Added the ability to escape `#` in rust documentation][41785] By adding
6758 additional `#`'s ie. `##` is now `#`
6763 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6764 - [`-Z` flags are now no longer allowed to be used on the stable
6765 compiler.][41751] This has been a warning for a year previous to this.
6766 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6767 longer works][42844]. Users should migrate to the built-in `check`
6768 command, which has been available since 1.16.
6769 - [Ending a float literal with `._` is now a hard error.
6770 Example: `42._` .][41946]
6771 - [Any use of a private `extern crate` outside of its module is now a
6772 hard error.][36886] This was previously a warning.
6773 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6774 relative while the `::` prefix makes a path absolute, but was ignored and the
6775 path was relative regardless.
6776 - [Floating point constants in match patterns is now a hard error][36890]
6777 This was previously a warning.
6778 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6779 match patterns is now a hard error][36891] This was previously a warning.
6780 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6782 - [From the pound escape, lines consisting of multiple `#`s are
6784 - [It is an error to re-export private enum variants][42460]. This is
6785 known to break a number of crates that depend on an older version of
6787 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6788 to use it to find the linker, and the build will fail where it did
6789 not previously][42607]
6791 [36886]: https://github.com/rust-lang/rust/issues/36886
6792 [36888]: https://github.com/rust-lang/rust/issues/36888
6793 [36890]: https://github.com/rust-lang/rust/issues/36890
6794 [36891]: https://github.com/rust-lang/rust/issues/36891
6795 [36892]: https://github.com/rust-lang/rust/issues/36892
6796 [37406]: https://github.com/rust-lang/rust/issues/37406
6797 [39983]: https://github.com/rust-lang/rust/pull/39983
6798 [41145]: https://github.com/rust-lang/rust/pull/41145
6799 [41192]: https://github.com/rust-lang/rust/pull/41192
6800 [41258]: https://github.com/rust-lang/rust/pull/41258
6801 [41370]: https://github.com/rust-lang/rust/pull/41370
6802 [41449]: https://github.com/rust-lang/rust/pull/41449
6803 [41530]: https://github.com/rust-lang/rust/pull/41530
6804 [41624]: https://github.com/rust-lang/rust/pull/41624
6805 [41656]: https://github.com/rust-lang/rust/pull/41656
6806 [41659]: https://github.com/rust-lang/rust/pull/41659
6807 [41676]: https://github.com/rust-lang/rust/pull/41676
6808 [41751]: https://github.com/rust-lang/rust/pull/41751
6809 [41764]: https://github.com/rust-lang/rust/pull/41764
6810 [41785]: https://github.com/rust-lang/rust/pull/41785
6811 [41873]: https://github.com/rust-lang/rust/pull/41873
6812 [41907]: https://github.com/rust-lang/rust/pull/41907
6813 [41946]: https://github.com/rust-lang/rust/pull/41946
6814 [42016]: https://github.com/rust-lang/rust/pull/42016
6815 [42037]: https://github.com/rust-lang/rust/pull/42037
6816 [42068]: https://github.com/rust-lang/rust/pull/42068
6817 [42150]: https://github.com/rust-lang/rust/pull/42150
6818 [42162]: https://github.com/rust-lang/rust/pull/42162
6819 [42225]: https://github.com/rust-lang/rust/pull/42225
6820 [42264]: https://github.com/rust-lang/rust/pull/42264
6821 [42302]: https://github.com/rust-lang/rust/pull/42302
6822 [42460]: https://github.com/rust-lang/rust/issues/42460
6823 [42607]: https://github.com/rust-lang/rust/issues/42607
6824 [42740]: https://github.com/rust-lang/rust/pull/42740
6825 [42844]: https://github.com/rust-lang/rust/issues/42844
6826 [42948]: https://github.com/rust-lang/rust/pull/42948
6827 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6828 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6829 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6830 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6831 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6832 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6833 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6834 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6835 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6836 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6837 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6838 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6839 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6840 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6841 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6842 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6843 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6844 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6845 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6846 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6847 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6848 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6851 Version 1.18.0 (2017-06-08)
6852 ===========================
6857 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6858 make the item visible to just that module tree. Also accepts the keyword
6859 `crate` to make something public to the whole crate but not users of the
6860 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6861 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6862 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6863 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6864 types like `Write + Send`, trailing `+` are now supported in trait objects,
6865 and better error reporting for trait objects starting with `?Sized`.
6866 - [0e+10 is now a valid floating point literal][40589]
6867 - [Now warns if you bind a lifetime parameter to 'static][40734]
6868 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6869 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6870 representation in some cases.][40377]
6875 - [rustc can now emit mir with `--emit mir`][39891]
6876 - [Improved LLVM IR for trivial functions][40367]
6877 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6878 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6879 opportunities found through profiling
6880 - [Improved backtrace formatting when panicking][38165]
6885 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6886 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6887 iteration or reallocation.
6888 - [Simplified HashMap Bucket interface][40561] provides performance
6889 improvements for iterating and cloning.
6890 - [Specialize Vec::from_elem to use calloc][40409]
6891 - [Fixed Race condition in fs::create_dir_all][39799]
6892 - [No longer caching stdio on Windows][40516]
6893 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6894 2.50%~ faster and in one case now 12.50% faster.
6895 - [Optimized `AtomicBool::fetch_nand`][41143]
6900 - [`Child::try_wait`]
6901 - [`HashMap::retain`]
6902 - [`HashSet::retain`]
6904 - [`TcpStream::peek`]
6905 - [`UdpSocket::peek`]
6906 - [`UdpSocket::peek_from`]
6911 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6912 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6913 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6914 - [Added Android build support][cargo/3885]
6915 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6916 of a certain type, for example `cargo build --bins` will build all
6918 - [Added support for haiku][cargo/3952]
6923 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6924 - [Rust now uses the official cross compiler for NetBSD][40612]
6925 - [rustdoc now accepts `#` at the start of files][40828]
6926 - [Fixed jemalloc support for musl][41168]
6931 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6932 always placed after the sign if it exists and before the digits. With the `#`
6933 flag the zeroes are placed after the prefix and before the digits.
6934 - [Due to the struct field optimisation][40377], using `transmute` on structs
6935 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6936 always been undefined behavior, but is now more likely to break in practice.
6937 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6938 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6939 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6940 - [Overlapping inherent `impl`s are now a hard error][40728]
6941 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6942 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6943 `out.asm` and `out.ll` instead of only one of the filetypes.
6944 - [ calling a function that returns `Self` will no longer work][41805] when
6945 the size of `Self` cannot be statically determined.
6946 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6947 this has caused a few regressions namely:
6949 - Changed the link order of local static/dynamic libraries (respecting the
6950 order on given rather than having the compiler reorder).
6951 - Changed how MinGW is linked, native code linked to dynamic libraries
6952 may require manually linking to the gcc support library (for the native
6955 [38165]: https://github.com/rust-lang/rust/pull/38165
6956 [39799]: https://github.com/rust-lang/rust/pull/39799
6957 [39891]: https://github.com/rust-lang/rust/pull/39891
6958 [40043]: https://github.com/rust-lang/rust/pull/40043
6959 [40241]: https://github.com/rust-lang/rust/pull/40241
6960 [40338]: https://github.com/rust-lang/rust/pull/40338
6961 [40367]: https://github.com/rust-lang/rust/pull/40367
6962 [40377]: https://github.com/rust-lang/rust/pull/40377
6963 [40409]: https://github.com/rust-lang/rust/pull/40409
6964 [40516]: https://github.com/rust-lang/rust/pull/40516
6965 [40556]: https://github.com/rust-lang/rust/pull/40556
6966 [40561]: https://github.com/rust-lang/rust/pull/40561
6967 [40589]: https://github.com/rust-lang/rust/pull/40589
6968 [40612]: https://github.com/rust-lang/rust/pull/40612
6969 [40723]: https://github.com/rust-lang/rust/pull/40723
6970 [40728]: https://github.com/rust-lang/rust/pull/40728
6971 [40731]: https://github.com/rust-lang/rust/pull/40731
6972 [40734]: https://github.com/rust-lang/rust/pull/40734
6973 [40805]: https://github.com/rust-lang/rust/pull/40805
6974 [40807]: https://github.com/rust-lang/rust/pull/40807
6975 [40828]: https://github.com/rust-lang/rust/pull/40828
6976 [40870]: https://github.com/rust-lang/rust/pull/40870
6977 [41085]: https://github.com/rust-lang/rust/pull/41085
6978 [41143]: https://github.com/rust-lang/rust/pull/41143
6979 [41168]: https://github.com/rust-lang/rust/pull/41168
6980 [41270]: https://github.com/rust-lang/rust/issues/41270
6981 [41469]: https://github.com/rust-lang/rust/pull/41469
6982 [41805]: https://github.com/rust-lang/rust/issues/41805
6983 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6984 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6985 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6986 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6987 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6988 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6989 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6990 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6991 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6992 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6993 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6994 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6995 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6996 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6999 Version 1.17.0 (2017-04-27)
7000 ===========================
7005 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
7006 * [Fields of structs may be initialized without duplicating the field/variable
7007 names][39761]. [RFC 1682]
7008 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
7009 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7010 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
7011 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
7012 `'b`. Soundness fix.
7013 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
7014 * [Static variables may contain references to other statics][40027]
7019 * [Exit quickly on only `--emit dep-info`][40336]
7020 * [Make `-C relocation-model` more correctly determine whether the linker
7021 creates a position-independent executable][40245]
7022 * [Add `-C overflow-checks` to directly control whether integer overflow
7024 * [The rustc type checker now checks items on demand instead of in a single
7025 in-order pass][40008]. This is mostly an internal refactoring in support of
7026 future work, including incremental type checking, but also resolves [RFC
7027 1647], allowing `Self` to appear in `impl` `where` clauses.
7028 * [Optimize vtable loads][39995]
7029 * [Turn off vectorization for Emscripten targets][39990]
7030 * [Provide suggestions for unknown macros imported with `use`][39953]
7031 * [Fix ICEs in path resolution][39939]
7032 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
7033 * [Add clearer error message using `&str + &str`][39116]
7044 * [`Ordering::then`]
7045 * [`Ordering::then_with`]
7046 * [`BTreeMap::range`]
7047 * [`BTreeMap::range_mut`]
7048 * [`collections::Bound`]
7049 * [`process::abort`]
7050 * [`ptr::read_unaligned`]
7051 * [`ptr::write_unaligned`]
7052 * [`Result::expect_err`]
7055 * [`Cell::into_inner`]
7061 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
7062 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
7063 * [`String` implements `FromIterator<&char>`][40028]
7064 * `Box` [implements][40009] a number of new conversions:
7065 `From<Box<str>> for String`,
7066 `From<Box<[T]>> for Vec<T>`,
7067 `From<Box<CStr>> for CString`,
7068 `From<Box<OsStr>> for OsString`,
7069 `From<Box<Path>> for PathBuf`,
7070 `Into<Box<str>> for String`,
7071 `Into<Box<[T]>> for Vec<T>`,
7072 `Into<Box<CStr>> for CString`,
7073 `Into<Box<OsStr>> for OsString`,
7074 `Into<Box<Path>> for PathBuf`,
7075 `Default for Box<str>`,
7076 `Default for Box<CStr>`,
7077 `Default for Box<OsStr>`,
7078 `From<&CStr> for Box<CStr>`,
7079 `From<&OsStr> for Box<OsStr>`,
7080 `From<&Path> for Box<Path>`
7081 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
7082 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
7083 * [Slightly optimize `slice::sort`][39538]
7084 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
7085 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
7086 `Box<str>` implements `From<&str>`][39438]
7087 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
7088 `From<(I, u16)> where I: Into<IpAddr>`][39372]
7089 * [`format!` estimates the needed capacity before writing a string][39356]
7090 * [Support unprivileged symlink creation in Windows][38921]
7091 * [`PathBuf` implements `Default`][38764]
7092 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
7093 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
7094 and poor hash functions.
7099 * [Add `cargo check --all`][cargo/3731]
7100 * [Add an option to ignore SSL revocation checking][cargo/3699]
7101 * [Add `cargo run --package`][cargo/3691]
7102 * [Add `required_features`][cargo/3667]
7103 * [Assume `build.rs` is a build script][cargo/3664]
7104 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
7109 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
7111 * [The "Unstable Book" documents nightly-only features][ubook]
7112 * [Improve the style of the sidebar in rustdoc output][40265]
7113 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
7114 * [Fix MSP430 breakage due to `i128`][40257]
7115 * [Preliminary Solaris/SPARCv9 support][39903]
7116 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
7117 run without installing the MSVC runtime.
7118 * [`rustdoc --test` includes file names in test names][39788]
7119 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
7120 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
7121 * [Initial support for `aarch64-unknown-freebsd`][39491]
7122 * [Initial support for `i686-unknown-netbsd`][39426]
7123 * [This release no longer includes the old makefile build system][39431]. Rust
7124 is built with a custom build system, written in Rust, and with Cargo.
7125 * [Add Debug implementations for libcollection structs][39002]
7126 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
7127 * [`--test-threads=0` produces an error][38945]
7128 * [`rustup` installs documentation by default][40526]
7129 * [The Rust source includes NatVis visualizations][39843]. These can be used by
7130 WinDbg and Visual Studio to improve the debugging experience.
7135 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
7136 workaround, either use MSVC 2015 or run vcvars.bat.
7137 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7138 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
7139 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
7141 * [`format!` and `Display::to_string` panic if an underlying formatting
7142 implementation returns an error][40117]. Previously the error was silently
7143 ignored. It is incorrect for `write_fmt` to return an error when writing
7145 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
7146 crates were marked stable and could be accessed from the stable toolchain.
7147 * [Rust git source no longer includes vendored crates][39728]. Those that need
7148 to build with vendored crates should build from release tarballs.
7149 * [Fix inert attributes from `proc_macro_derives`][39572]
7150 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
7151 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
7153 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
7154 existing code generally ignores the type of dead-code unless a type-hint is
7155 provided; this can cause surprising inference interactions particularly around
7156 defaulting. The new code uniformly ignores the result type of dead-code.
7157 * [Tuple-struct constructors with private fields are no longer visible][38932]
7158 * [Lifetime parameters that do not appear in the arguments are now considered
7159 early-bound][38897], resolving a soundness bug (#[32330]). The
7160 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
7162 * [rustdoc: fix doctests with non-feature crate attributes][38161]
7163 * [Make transmuting from fn item types to pointer-sized types a hard
7166 [27787]: https://github.com/rust-lang/rust/issues/27787
7167 [32330]: https://github.com/rust-lang/rust/issues/32330
7168 [34198]: https://github.com/rust-lang/rust/pull/34198
7169 [38161]: https://github.com/rust-lang/rust/pull/38161
7170 [38368]: https://github.com/rust-lang/rust/pull/38368
7171 [38584]: https://github.com/rust-lang/rust/issues/38584
7172 [38661]: https://github.com/rust-lang/rust/pull/38661
7173 [38764]: https://github.com/rust-lang/rust/pull/38764
7174 [38864]: https://github.com/rust-lang/rust/issues/38864
7175 [38897]: https://github.com/rust-lang/rust/pull/38897
7176 [38921]: https://github.com/rust-lang/rust/pull/38921
7177 [38932]: https://github.com/rust-lang/rust/pull/38932
7178 [38945]: https://github.com/rust-lang/rust/pull/38945
7179 [38981]: https://github.com/rust-lang/rust/pull/38981
7180 [39002]: https://github.com/rust-lang/rust/pull/39002
7181 [39116]: https://github.com/rust-lang/rust/pull/39116
7182 [39193]: https://github.com/rust-lang/rust/pull/39193
7183 [39265]: https://github.com/rust-lang/rust/pull/39265
7184 [39356]: https://github.com/rust-lang/rust/pull/39356
7185 [39372]: https://github.com/rust-lang/rust/pull/39372
7186 [39426]: https://github.com/rust-lang/rust/pull/39426
7187 [39431]: https://github.com/rust-lang/rust/pull/39431
7188 [39438]: https://github.com/rust-lang/rust/pull/39438
7189 [39440]: https://github.com/rust-lang/rust/pull/39440
7190 [39485]: https://github.com/rust-lang/rust/pull/39485
7191 [39491]: https://github.com/rust-lang/rust/pull/39491
7192 [39518]: https://github.com/rust-lang/rust/pull/39518
7193 [39538]: https://github.com/rust-lang/rust/pull/39538
7194 [39572]: https://github.com/rust-lang/rust/pull/39572
7195 [39633]: https://github.com/rust-lang/rust/pull/39633
7196 [39642]: https://github.com/rust-lang/rust/pull/39642
7197 [39728]: https://github.com/rust-lang/rust/pull/39728
7198 [39761]: https://github.com/rust-lang/rust/pull/39761
7199 [39788]: https://github.com/rust-lang/rust/pull/39788
7200 [39793]: https://github.com/rust-lang/rust/pull/39793
7201 [39837]: https://github.com/rust-lang/rust/pull/39837
7202 [39843]: https://github.com/rust-lang/rust/pull/39843
7203 [39851]: https://github.com/rust-lang/rust/pull/39851
7204 [39903]: https://github.com/rust-lang/rust/pull/39903
7205 [39939]: https://github.com/rust-lang/rust/pull/39939
7206 [39953]: https://github.com/rust-lang/rust/pull/39953
7207 [39960]: https://github.com/rust-lang/rust/pull/39960
7208 [39990]: https://github.com/rust-lang/rust/pull/39990
7209 [39995]: https://github.com/rust-lang/rust/pull/39995
7210 [40008]: https://github.com/rust-lang/rust/pull/40008
7211 [40009]: https://github.com/rust-lang/rust/pull/40009
7212 [40027]: https://github.com/rust-lang/rust/pull/40027
7213 [40028]: https://github.com/rust-lang/rust/pull/40028
7214 [40037]: https://github.com/rust-lang/rust/pull/40037
7215 [40117]: https://github.com/rust-lang/rust/pull/40117
7216 [40166]: https://github.com/rust-lang/rust/pull/40166
7217 [40245]: https://github.com/rust-lang/rust/pull/40245
7218 [40257]: https://github.com/rust-lang/rust/pull/40257
7219 [40261]: https://github.com/rust-lang/rust/pull/40261
7220 [40265]: https://github.com/rust-lang/rust/pull/40265
7221 [40319]: https://github.com/rust-lang/rust/pull/40319
7222 [40336]: https://github.com/rust-lang/rust/pull/40336
7223 [40526]: https://github.com/rust-lang/rust/pull/40526
7224 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7225 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7226 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7227 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7228 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7229 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7230 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7231 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7232 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7233 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7234 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7235 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7236 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7237 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7238 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7239 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7240 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7241 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7242 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7243 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7244 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7245 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7246 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7247 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7248 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7249 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7250 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7251 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7252 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7253 [ubook]: https://doc.rust-lang.org/unstable-book/
7256 Version 1.16.0 (2017-03-16)
7257 ===========================
7262 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7263 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7264 match patterns][38069]
7265 * [Clean up semantics of `self` in an import list][38313]
7266 * [`Self` may appear in `impl` headers][38920]
7267 * [`Self` may appear in struct expressions][39282]
7272 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7273 a `.rmeta` file containing only crate metadata][38571]. This can be
7274 used by tools like the Rust Language Service to perform
7275 metadata-only builds.
7276 * [Levenshtein based typo suggestions now work in most places, while
7277 previously they worked only for fields and sometimes for local
7278 variables][38927]. Together with the overhaul of "no
7279 resolution"/"unexpected resolution" errors (#[38154]) they result in
7280 large and systematic improvement in resolution diagnostics.
7281 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7283 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7284 * [`rustc` no longer attempts to provide "consider using an explicit
7285 lifetime" suggestions][37057]. They were inaccurate.
7290 * [`VecDeque::truncate`]
7291 * [`VecDeque::resize`]
7292 * [`String::insert_str`]
7293 * [`Duration::checked_add`]
7294 * [`Duration::checked_sub`]
7295 * [`Duration::checked_div`]
7296 * [`Duration::checked_mul`]
7299 * [`SocketAddr::is_ipv4`]
7300 * [`SocketAddr::is_ipv6`]
7301 * [`IpAddr::is_ipv4`]
7302 * [`IpAddr::is_ipv6`]
7304 * [`Vec::dedup_by_key`]
7305 * [`Result::unwrap_or_default`]
7306 * [`<*const T>::wrapping_offset`]
7307 * [`<*mut T>::wrapping_offset`]
7308 * `CommandExt::creation_flags`
7309 * [`File::set_permissions`]
7310 * [`String::split_off`]
7315 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7316 their argument by `Borrow` parameter][37761]
7317 * [All public types in std implement `Debug`][38006]
7318 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7319 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7320 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7322 * [std: Fix partial writes in `LineWriter`][38062]
7323 * [std: Clamp max read/write sizes on Unix][38622]
7324 * [Use more specific panic message for `&str` slicing errors][38066]
7325 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7326 functionality cannot be achieved in std currently.
7327 * [`writeln!`, like `println!`, now accepts a form with no string
7328 or formatting arguments, to just print a newline][38469]
7329 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7330 * [Reduce the size of static data in `std_unicode::tables`][38781]
7331 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7332 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7334 * [`Duration` implements `Sum`][38712]
7335 * [`String` implements `ToSocketAddrs`][39048]
7340 * [The `cargo check` command does a type check of a project without
7341 building it][cargo/3296]
7342 * [crates.io will display CI badges from Travis and AppVeyor, if
7343 specified in Cargo.toml][cargo/3546]
7344 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7345 * [Compilation profiles accept integer values for `debug`, in addition
7346 to `true` and `false`. These are passed to `rustc` as the value to
7347 `-C debuginfo`][cargo/3534]
7348 * [Implement `cargo --version --verbose`][cargo/3604]
7349 * [All builds now output 'dep-info' build dependencies compatible with
7350 make and ninja][cargo/3557]
7351 * [Build all workspace members with `build --all`][cargo/3511]
7352 * [Document all workspace members with `doc --all`][cargo/3515]
7353 * [Path deps outside workspace are not members][cargo/3443]
7358 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7359 the path to the Rust implementation][38589]
7360 * [The `armv7-linux-androideabi` target no longer enables NEON
7361 extensions, per Google's ABI guide][38413]
7362 * [The stock standard library can be compiled for Redox OS][38401]
7363 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7365 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7367 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7372 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7373 match patterns][38069]
7374 * In this release, references to uninhabited types can not be
7375 pattern-matched. This was accidentally allowed in 1.15.
7376 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7377 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7379 * [Clean up semantics of `self` in an import list][38313]
7380 * Reimplemented lifetime elision. This change was almost entirely compatible
7381 with existing code, but it did close a number of small bugs and loopholes,
7382 as well as being more accepting in some other [cases][41105].
7384 [37057]: https://github.com/rust-lang/rust/pull/37057
7385 [37761]: https://github.com/rust-lang/rust/pull/37761
7386 [38006]: https://github.com/rust-lang/rust/pull/38006
7387 [38051]: https://github.com/rust-lang/rust/pull/38051
7388 [38062]: https://github.com/rust-lang/rust/pull/38062
7389 [38622]: https://github.com/rust-lang/rust/pull/38622
7390 [38066]: https://github.com/rust-lang/rust/pull/38066
7391 [38069]: https://github.com/rust-lang/rust/pull/38069
7392 [38131]: https://github.com/rust-lang/rust/pull/38131
7393 [38154]: https://github.com/rust-lang/rust/pull/38154
7394 [38274]: https://github.com/rust-lang/rust/pull/38274
7395 [38304]: https://github.com/rust-lang/rust/pull/38304
7396 [38313]: https://github.com/rust-lang/rust/pull/38313
7397 [38327]: https://github.com/rust-lang/rust/pull/38327
7398 [38401]: https://github.com/rust-lang/rust/pull/38401
7399 [38413]: https://github.com/rust-lang/rust/pull/38413
7400 [38469]: https://github.com/rust-lang/rust/pull/38469
7401 [38559]: https://github.com/rust-lang/rust/pull/38559
7402 [38571]: https://github.com/rust-lang/rust/pull/38571
7403 [38580]: https://github.com/rust-lang/rust/pull/38580
7404 [38589]: https://github.com/rust-lang/rust/pull/38589
7405 [38670]: https://github.com/rust-lang/rust/pull/38670
7406 [38712]: https://github.com/rust-lang/rust/pull/38712
7407 [38726]: https://github.com/rust-lang/rust/pull/38726
7408 [38781]: https://github.com/rust-lang/rust/pull/38781
7409 [38798]: https://github.com/rust-lang/rust/pull/38798
7410 [38909]: https://github.com/rust-lang/rust/pull/38909
7411 [38920]: https://github.com/rust-lang/rust/pull/38920
7412 [38927]: https://github.com/rust-lang/rust/pull/38927
7413 [39048]: https://github.com/rust-lang/rust/pull/39048
7414 [39282]: https://github.com/rust-lang/rust/pull/39282
7415 [39379]: https://github.com/rust-lang/rust/pull/39379
7416 [41105]: https://github.com/rust-lang/rust/issues/41105
7417 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7418 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7419 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7420 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7421 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7422 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7423 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7424 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7425 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7426 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7427 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7428 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7429 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7430 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7431 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7432 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7433 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7434 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7435 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7436 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7437 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7438 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7439 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7440 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7441 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7442 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7443 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7444 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7445 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7448 Version 1.15.1 (2017-02-09)
7449 ===========================
7451 * [Fix IntoIter::as_mut_slice's signature][39466]
7452 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7454 [39466]: https://github.com/rust-lang/rust/pull/39466
7455 [39523]: https://github.com/rust-lang/rust/pull/39523
7458 Version 1.15.0 (2017-02-02)
7459 ===========================
7464 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7465 stable. This allows popular code-generating crates like Serde and Diesel to
7466 work ergonomically. [RFC 1681].
7467 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7468 with curly braces][36868]. Part of [RFC 1506].
7469 * [A number of minor changes to name resolution have been activated][37127].
7470 They add up to more consistent semantics, allowing for future evolution of
7471 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7472 details of what is different. The breaking changes here have been transitioned
7473 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7474 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7476 * [`?Sized` can be used in `where` clauses][37791]
7477 * [There is now a limit on the size of monomorphized types and it can be
7478 modified with the `#![type_size_limit]` crate attribute, similarly to
7479 the `#![recursion_limit]` attribute][37789]
7484 * [On Windows, the compiler will apply dllimport attributes when linking to
7485 extern functions][37973]. Additional attributes and flags can control which
7486 library kind is linked and its name. [RFC 1717].
7487 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7488 * [The `--test` flag works with procedural macro crates][38107]
7489 * [Fix `extern "aapcs" fn` ABI][37814]
7490 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7491 * [The `format!` expander recognizes incorrect `printf` and shell-style
7492 formatting directives and suggests the correct format][37613].
7493 * [Only report one error for all unused imports in an import list][37456]
7495 Compiler Performance
7496 --------------------
7498 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7499 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7500 * [Don't clone in `UnificationTable::probe`][37848]
7501 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7502 * [Use small vectors in type walker][37760]
7503 * [Macro expansion performance was improved][37701]
7504 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7505 * [Replace FNV with a faster hash function][37229]
7510 * [`std::iter::Iterator::min_by`]
7511 * [`std::iter::Iterator::max_by`]
7512 * [`std::os::*::fs::FileExt`]
7513 * [`std::sync::atomic::Atomic*::get_mut`]
7514 * [`std::sync::atomic::Atomic*::into_inner`]
7515 * [`std::vec::IntoIter::as_slice`]
7516 * [`std::vec::IntoIter::as_mut_slice`]
7517 * [`std::sync::mpsc::Receiver::try_iter`]
7518 * [`std::os::unix::process::CommandExt::before_exec`]
7519 * [`std::rc::Rc::strong_count`]
7520 * [`std::rc::Rc::weak_count`]
7521 * [`std::sync::Arc::strong_count`]
7522 * [`std::sync::Arc::weak_count`]
7523 * [`std::char::encode_utf8`]
7524 * [`std::char::encode_utf16`]
7525 * [`std::cell::Ref::clone`]
7526 * [`std::io::Take::into_inner`]
7531 * [The standard sorting algorithm has been rewritten for dramatic performance
7532 improvements][38192]. It is a hybrid merge sort, drawing influences from
7533 Timsort. Previously it was a naive merge sort.
7534 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7535 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7537 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7538 and `char_indices().last()`][37882]
7539 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7540 * [Chinese characters display correctly in `fmt::Debug`][37855]
7541 * [Derive `Default` for `Duration`][37699]
7542 * [Support creation of anonymous pipes on WinXP/2k][37677]
7543 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7544 * [Don't pass overlapped handles to processes][38835]
7549 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7550 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7551 should instead check the variable at runtime with `std::env`. That the value
7552 was set at build time was a bug, and incorrect when cross-compiling. This
7553 change is known to cause breakage.
7554 * [Add `--all` flag to `cargo test`][cargo/3221]
7555 * [Compile statically against the MSVC CRT][cargo/3363]
7556 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7557 * [Link OpenSSL statically on OSX][cargo/3311]
7558 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7559 * [Test for bad path overrides with summaries][cargo/3336]
7560 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7561 * [Fix retrying crate downloads for network errors][cargo/3348]
7562 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7563 * [Emit more info on --message-format=json][cargo/3319]
7564 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7565 * [Don't ignore errors in workspace manifest][cargo/3409]
7566 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7571 * [Test runners (binaries built with `--test`) now support a `--list` argument
7572 that lists the tests it contains][38185]
7573 * [Test runners now support a `--exact` argument that makes the test filter
7574 match exactly, instead of matching only a substring of the test name][38181]
7575 * [rustdoc supports a `--playground-url` flag][37763]
7576 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7581 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7582 continue to be used in this release by passing `--disable-rustbuild` to the
7583 configure script, but they will be deleted soon. Note that the new build
7584 system uses a different on-disk layout that will likely affect any scripts
7586 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7588 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7589 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7595 * [A number of minor changes to name resolution have been activated][37127].
7596 They add up to more consistent semantics, allowing for future evolution of
7597 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7598 details of what is different. The breaking changes here have been transitioned
7599 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7600 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7601 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7602 should instead check the variable at runtime with `std::env`. That the value
7603 was set at build time was a bug, and incorrect when cross-compiling. This
7604 change is known to cause breakage.
7605 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7606 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7607 1.10 and is now an error by default. It will become a hard error in the near
7609 * [The semantics relating modules to file system directories are changing in
7610 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7611 lint, which is a warning in this release, and will become a hard error in the
7613 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7614 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7615 the underlying iterator][37834]
7617 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7618 [33685]: https://github.com/rust-lang/rust/issues/33685
7619 [36868]: https://github.com/rust-lang/rust/pull/36868
7620 [37127]: https://github.com/rust-lang/rust/pull/37127
7621 [37229]: https://github.com/rust-lang/rust/pull/37229
7622 [37456]: https://github.com/rust-lang/rust/pull/37456
7623 [37527]: https://github.com/rust-lang/rust/pull/37527
7624 [37602]: https://github.com/rust-lang/rust/pull/37602
7625 [37613]: https://github.com/rust-lang/rust/pull/37613
7626 [37615]: https://github.com/rust-lang/rust/pull/37615
7627 [37636]: https://github.com/rust-lang/rust/pull/37636
7628 [37627]: https://github.com/rust-lang/rust/pull/37627
7629 [37642]: https://github.com/rust-lang/rust/pull/37642
7630 [37677]: https://github.com/rust-lang/rust/pull/37677
7631 [37699]: https://github.com/rust-lang/rust/pull/37699
7632 [37701]: https://github.com/rust-lang/rust/pull/37701
7633 [37705]: https://github.com/rust-lang/rust/pull/37705
7634 [37749]: https://github.com/rust-lang/rust/pull/37749
7635 [37760]: https://github.com/rust-lang/rust/pull/37760
7636 [37763]: https://github.com/rust-lang/rust/pull/37763
7637 [37764]: https://github.com/rust-lang/rust/pull/37764
7638 [37789]: https://github.com/rust-lang/rust/pull/37789
7639 [37791]: https://github.com/rust-lang/rust/pull/37791
7640 [37814]: https://github.com/rust-lang/rust/pull/37814
7641 [37817]: https://github.com/rust-lang/rust/pull/37817
7642 [37834]: https://github.com/rust-lang/rust/pull/37834
7643 [37848]: https://github.com/rust-lang/rust/pull/37848
7644 [37855]: https://github.com/rust-lang/rust/pull/37855
7645 [37882]: https://github.com/rust-lang/rust/pull/37882
7646 [37888]: https://github.com/rust-lang/rust/pull/37888
7647 [37973]: https://github.com/rust-lang/rust/pull/37973
7648 [37979]: https://github.com/rust-lang/rust/pull/37979
7649 [38086]: https://github.com/rust-lang/rust/pull/38086
7650 [38107]: https://github.com/rust-lang/rust/pull/38107
7651 [38117]: https://github.com/rust-lang/rust/pull/38117
7652 [38134]: https://github.com/rust-lang/rust/pull/38134
7653 [38146]: https://github.com/rust-lang/rust/pull/38146
7654 [38181]: https://github.com/rust-lang/rust/pull/38181
7655 [38182]: https://github.com/rust-lang/rust/pull/38182
7656 [38185]: https://github.com/rust-lang/rust/pull/38185
7657 [38192]: https://github.com/rust-lang/rust/pull/38192
7658 [38279]: https://github.com/rust-lang/rust/pull/38279
7659 [38835]: https://github.com/rust-lang/rust/pull/38835
7660 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7661 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7662 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7663 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7664 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7665 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7666 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7667 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7668 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7669 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7670 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7671 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7672 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7673 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7674 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7675 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7676 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7677 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7678 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7679 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7680 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7681 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7682 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7683 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7684 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7685 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7686 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7687 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7688 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7689 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7690 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7691 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7692 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7693 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7694 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7695 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7696 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7699 Version 1.14.0 (2016-12-22)
7700 ===========================
7705 * [`..` matches multiple tuple fields in enum variants, structs
7706 and tuples][36843]. [RFC 1492].
7707 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7708 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7709 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7710 dereferencing][36822]
7715 * [Mark enums with non-zero discriminant as non-zero][37224]
7716 * [Lower-case `static mut` names are linted like other
7717 statics and consts][37162]
7718 * [Fix ICE on some macros in const integer positions
7719 (e.g. `[u8; m!()]`)][36819]
7720 * [Improve error message and snippet for "did you mean `x`"][36798]
7721 * [Add a panic-strategy field to the target specification][36794]
7722 * [Include LLVM version in `--version --verbose`][37200]
7724 Compile-time Optimizations
7725 --------------------------
7727 * [Improve macro expansion performance][37569]
7728 * [Shrink `Expr_::ExprInlineAsm`][37445]
7729 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7730 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7731 * [Avoid more allocations when compiling html5ever][37373]
7732 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7733 * [Avoid some allocations in the macro parser][37318]
7734 * [Use a faster deflate setting][37298]
7735 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7736 during interning of slices][37270]
7737 * [Optimize `write_metadata`][37267]
7738 * [Don't process obligation forest cycles when stalled][37231]
7739 * [Avoid many `CrateConfig` clones][37161]
7740 * [Optimize `Substs::super_fold_with`][37108]
7741 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7742 * [Speed up `plug_leaks`][36917]
7747 * [`println!()`, with no arguments, prints newline][36825].
7748 Previously, an empty string was required to achieve the same.
7749 * [`Wrapping` impls standard binary and unary operators, as well as
7750 the `Sum` and `Product` iterators][37356]
7751 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7753 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7754 `VecDeque` iterators][37315]
7755 * [Improve `SipHasher` performance on small values][37312]
7756 * [Add Iterator trait TrustedLen to enable better FromIterator /
7758 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7759 * [`ReadDir` implements `Debug`][37221]
7760 * [Implement `RefUnwindSafe` for atomic types][37178]
7761 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7762 * [Avoid allocations in `Decoder::read_str`][37064]
7763 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7764 * [Impl `Debug` for raw pointers to unsized data][36880]
7765 * [Don't reuse `HashMap` random seeds][37470]
7766 * [The internal memory layout of `HashMap` is more cache-friendly, for
7767 significant improvements in some operations][36692]
7768 * [`HashMap` uses less memory on 32-bit architectures][36595]
7769 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7774 * [Expose rustc cfg values to build scripts][cargo/3243]
7775 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7776 * [Fix passing --features when testing multiple packages][cargo/3280]
7777 * [Use a single profile set per workspace][cargo/3249]
7778 * [Load `replace` sections from lock files][cargo/3220]
7779 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7784 * [rustup is the recommended Rust installation method][1.14rustup]
7785 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7786 S390x. These are [tier 2] platforms and may have major defects. Follow the
7787 instructions on the website to install, or add the targets to an existing
7788 installation with `rustup target add`. The new target triples are:
7789 - `mips-unknown-linux-gnu`
7790 - `mipsel-unknown-linux-gnu`
7791 - `mips64-unknown-linux-gnuabi64`
7792 - `mips64el-unknown-linux-gnuabi64 `
7793 - `powerpc-unknown-linux-gnu`
7794 - `powerpc64-unknown-linux-gnu`
7795 - `powerpc64le-unknown-linux-gnu`
7796 - `s390x-unknown-linux-gnu `
7797 * This release includes target (std) builds for ARM Linux running MUSL
7798 libc. These are [tier 2] platforms and may have major defects. Add the
7799 following triples to an existing rustup installation with `rustup target add`:
7800 - `arm-unknown-linux-musleabi`
7801 - `arm-unknown-linux-musleabihf`
7802 - `armv7-unknown-linux-musleabihf`
7803 * This release includes [experimental support for WebAssembly][1.14wasm], via
7804 the `wasm32-unknown-emscripten` target. This target is known to have major
7805 defects. Please test, report, and fix.
7806 * rustup no longer installs documentation by default. Run `rustup
7807 component add rust-docs` to install.
7808 * [Fix line stepping in debugger][37310]
7809 * [Enable line number debuginfo in releases][37280]
7814 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7815 * [Add support for Fuchsia OS][37313]
7816 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7821 * [A number of forward-compatibility lints used by the compiler
7822 to gradually introduce language changes have been converted
7823 to deny by default][36894]:
7824 - ["use of inaccessible extern crate erroneously allowed"][36886]
7825 - ["type parameter default erroneously allowed in invalid location"][36887]
7826 - ["detects super or self keywords at the beginning of global path"][36888]
7827 - ["two overlapping inherent impls define an item with the same name
7828 were erroneously allowed"][36889]
7829 - ["floating-point constants cannot be used in patterns"][36890]
7830 - ["constants of struct or enum type can only be used in a pattern if
7831 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7832 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7833 * [Prohibit patterns in trait methods without bodies][37378]
7834 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7835 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7836 * [The `$crate` macro variable is accepted in fewer locations][37213]
7837 * [Impls specifying extra region requirements beyond the trait
7838 they implement are rejected][37167]
7839 * [Enums may not be unsized][37111]. Unsized enums are intended to
7840 work but never have. For now they are forbidden.
7841 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7843 [tier 2]: https://forge.rust-lang.org/platform-support.html
7844 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7845 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7846 [36430]: https://github.com/rust-lang/rust/pull/36430
7847 [36595]: https://github.com/rust-lang/rust/pull/36595
7848 [36692]: https://github.com/rust-lang/rust/pull/36692
7849 [36767]: https://github.com/rust-lang/rust/pull/36767
7850 [36794]: https://github.com/rust-lang/rust/pull/36794
7851 [36798]: https://github.com/rust-lang/rust/pull/36798
7852 [36819]: https://github.com/rust-lang/rust/pull/36819
7853 [36822]: https://github.com/rust-lang/rust/pull/36822
7854 [36825]: https://github.com/rust-lang/rust/pull/36825
7855 [36843]: https://github.com/rust-lang/rust/pull/36843
7856 [36880]: https://github.com/rust-lang/rust/pull/36880
7857 [36886]: https://github.com/rust-lang/rust/issues/36886
7858 [36887]: https://github.com/rust-lang/rust/issues/36887
7859 [36888]: https://github.com/rust-lang/rust/issues/36888
7860 [36889]: https://github.com/rust-lang/rust/issues/36889
7861 [36890]: https://github.com/rust-lang/rust/issues/36890
7862 [36891]: https://github.com/rust-lang/rust/issues/36891
7863 [36892]: https://github.com/rust-lang/rust/issues/36892
7864 [36894]: https://github.com/rust-lang/rust/pull/36894
7865 [36917]: https://github.com/rust-lang/rust/pull/36917
7866 [36993]: https://github.com/rust-lang/rust/pull/36993
7867 [37037]: https://github.com/rust-lang/rust/pull/37037
7868 [37064]: https://github.com/rust-lang/rust/pull/37064
7869 [37094]: https://github.com/rust-lang/rust/pull/37094
7870 [37108]: https://github.com/rust-lang/rust/pull/37108
7871 [37111]: https://github.com/rust-lang/rust/pull/37111
7872 [37161]: https://github.com/rust-lang/rust/pull/37161
7873 [37162]: https://github.com/rust-lang/rust/pull/37162
7874 [37167]: https://github.com/rust-lang/rust/pull/37167
7875 [37178]: https://github.com/rust-lang/rust/pull/37178
7876 [37200]: https://github.com/rust-lang/rust/pull/37200
7877 [37213]: https://github.com/rust-lang/rust/pull/37213
7878 [37221]: https://github.com/rust-lang/rust/pull/37221
7879 [37224]: https://github.com/rust-lang/rust/pull/37224
7880 [37230]: https://github.com/rust-lang/rust/pull/37230
7881 [37231]: https://github.com/rust-lang/rust/pull/37231
7882 [37247]: https://github.com/rust-lang/rust/pull/37247
7883 [37267]: https://github.com/rust-lang/rust/pull/37267
7884 [37270]: https://github.com/rust-lang/rust/pull/37270
7885 [37273]: https://github.com/rust-lang/rust/pull/37273
7886 [37280]: https://github.com/rust-lang/rust/pull/37280
7887 [37298]: https://github.com/rust-lang/rust/pull/37298
7888 [37306]: https://github.com/rust-lang/rust/pull/37306
7889 [37310]: https://github.com/rust-lang/rust/pull/37310
7890 [37312]: https://github.com/rust-lang/rust/pull/37312
7891 [37313]: https://github.com/rust-lang/rust/pull/37313
7892 [37315]: https://github.com/rust-lang/rust/pull/37315
7893 [37318]: https://github.com/rust-lang/rust/pull/37318
7894 [37322]: https://github.com/rust-lang/rust/pull/37322
7895 [37326]: https://github.com/rust-lang/rust/pull/37326
7896 [37351]: https://github.com/rust-lang/rust/pull/37351
7897 [37356]: https://github.com/rust-lang/rust/pull/37356
7898 [37367]: https://github.com/rust-lang/rust/pull/37367
7899 [37373]: https://github.com/rust-lang/rust/pull/37373
7900 [37378]: https://github.com/rust-lang/rust/pull/37378
7901 [37389]: https://github.com/rust-lang/rust/pull/37389
7902 [37392]: https://github.com/rust-lang/rust/pull/37392
7903 [37427]: https://github.com/rust-lang/rust/pull/37427
7904 [37439]: https://github.com/rust-lang/rust/pull/37439
7905 [37445]: https://github.com/rust-lang/rust/pull/37445
7906 [37470]: https://github.com/rust-lang/rust/pull/37470
7907 [37569]: https://github.com/rust-lang/rust/pull/37569
7908 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7909 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7910 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7911 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7912 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7913 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7914 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7917 Version 1.13.0 (2016-11-10)
7918 ===========================
7923 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7924 errors, like the `try!` macro, described in [RFC 0243].
7925 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7926 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7927 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7928 * [Fix lifetime rules for 'if' conditions][36029]
7929 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7934 * [Add the `-C link-arg` argument][36574]
7935 * [Remove the old AST-based backend from rustc_trans][35764]
7936 * [Don't enable NEON by default on armv7 Linux][35814]
7937 * [Fix debug line number info for macro expansions][35238]
7938 * [Do not emit "class method" debuginfo for types that are not
7939 DICompositeType][36008]
7940 * [Warn about multiple conflicting #[repr] hints][34623]
7941 * [When sizing DST, don't double-count nested struct prefixes][36351]
7942 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7943 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7944 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7945 * [Expand macros without recursing to avoid stack overflows][36214]
7950 * [Replace macro backtraces with labeled local uses][35702]
7951 * [Improve error message for misplaced doc comments][33922]
7952 * [Buffer unix and lock windows to prevent message interleaving][35975]
7953 * [Update lifetime errors to specifically note temporaries][36171]
7954 * [Special case a few colors for Windows][36178]
7955 * [Suggest `use self` when such an import resolves][36289]
7956 * [Be more specific when type parameter shadows primitive type][36338]
7957 * Many minor improvements
7959 Compile-time Optimizations
7960 --------------------------
7962 * [Compute and cache HIR hashes at beginning][35854]
7963 * [Don't hash types in loan paths][36004]
7964 * [Cache projections in trans][35761]
7965 * [Optimize the parser's last token handling][36527]
7966 * [Only instantiate #[inline] functions in codegen units referencing
7967 them][36524]. This leads to big improvements in cases where crates export
7968 define many inline functions without using them directly.
7969 * [Lazily allocate TypedArena's first chunk][36592]
7970 * [Don't allocate during default HashSet creation][36734]
7977 * [`overflowing_abs`]
7978 * [`RefCell::try_borrow`]
7979 * [`RefCell::try_borrow_mut`]
7984 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7985 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7987 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7988 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7989 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7990 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7991 * [Use arc4rand on FreeBSD][35884]
7992 * [memrchr: Correct aligned offset computation][35969]
7993 * [Improve Demangling of Rust Symbols][36059]
7994 * [Use monotonic time in condition variables][35048]
7995 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7996 * [Implement conversion traits for `char`][35755]
7997 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7998 * [Zero first byte of CString on drop][36264]
7999 * [Inherit overflow checks for sum and product][36372]
8000 * [Add missing Eq implementations][36423]
8001 * [Implement `Debug` for `DirEntry`][36631]
8002 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
8004 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
8005 * [Implement more traits for `std::io::ErrorKind`][35911]
8006 * [Optimize BinaryHeap bounds checking][36072]
8007 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
8008 `extend_with_element`][36355]
8009 * [Fix overflow checking in unsigned pow()][34942]
8014 * This release includes security fixes to both curl and OpenSSL.
8015 * [Fix transitive doctests when panic=abort][cargo/3021]
8016 * [Add --all-features flag to cargo][cargo/3038]
8017 * [Reject path-based dependencies in `cargo package`][cargo/3060]
8018 * [Don't parse the home directory more than once][cargo/3078]
8019 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
8020 * [Update OpenSSL to 1.0.2j][cargo/3121]
8021 * [Add license and license_file to cargo metadata output][cargo/3110]
8022 * [Make crates-io registry URL optional in config; ignore all changes to
8023 source.crates-io][cargo/3089]
8024 * [Don't download dependencies from other platforms][cargo/3123]
8025 * [Build transitive dev-dependencies when needed][cargo/3125]
8026 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
8027 * [Avoid updating registry when adding existing deps][cargo/3144]
8028 * [Warn about path overrides that won't work][cargo/3136]
8029 * [Use workspaces during `cargo install`][cargo/3146]
8030 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
8031 * [Add --message-format flag][cargo/3000]
8032 * [Pass target environment for rustdoc][cargo/3205]
8033 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
8034 * [Update curl and curl-sys][cargo/3241]
8035 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
8040 * [rustdoc: Add the `--sysroot` argument][36586]
8041 * [rustdoc: Fix a couple of issues with the search results][35655]
8042 * [rustdoc: remove the `!` from macro URLs and titles][35234]
8043 * [gdb: Fix pretty-printing special-cased Rust types][35585]
8044 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
8049 * [Remove unmaintained style guide][35124]
8050 * [Add s390x support][36369]
8051 * [Initial work at Haiku OS support][36727]
8052 * [Add mips-uclibc targets][35734]
8053 * [Crate-ify compiler-rt into compiler-builtins][35021]
8054 * [Add rustc version info (git hash + date) to dist tarball][36213]
8055 * Many documentation improvements
8060 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
8061 * [Deny (by default) transmuting from fn item types to pointer-sized
8062 types][34923]. Continuing the long transition to zero-sized fn items,
8064 * [Fix `#[derive]` for empty tuple structs/variants][35728].
8066 * [Issue deprecation warnings for safe accesses to extern statics][36173]
8067 * [Fix lifetime rules for 'if' conditions][36029].
8068 * [Inherit overflow checks for sum and product][36372].
8069 * [Forbid user-defined macros named "macro_rules"][36730].
8071 [33922]: https://github.com/rust-lang/rust/pull/33922
8072 [34623]: https://github.com/rust-lang/rust/pull/34623
8073 [34923]: https://github.com/rust-lang/rust/pull/34923
8074 [34942]: https://github.com/rust-lang/rust/pull/34942
8075 [35021]: https://github.com/rust-lang/rust/pull/35021
8076 [35048]: https://github.com/rust-lang/rust/pull/35048
8077 [35074]: https://github.com/rust-lang/rust/pull/35074
8078 [35124]: https://github.com/rust-lang/rust/pull/35124
8079 [35234]: https://github.com/rust-lang/rust/pull/35234
8080 [35238]: https://github.com/rust-lang/rust/pull/35238
8081 [35354]: https://github.com/rust-lang/rust/pull/35354
8082 [35559]: https://github.com/rust-lang/rust/pull/35559
8083 [35585]: https://github.com/rust-lang/rust/pull/35585
8084 [35627]: https://github.com/rust-lang/rust/pull/35627
8085 [35655]: https://github.com/rust-lang/rust/pull/35655
8086 [35702]: https://github.com/rust-lang/rust/pull/35702
8087 [35707]: https://github.com/rust-lang/rust/pull/35707
8088 [35728]: https://github.com/rust-lang/rust/pull/35728
8089 [35734]: https://github.com/rust-lang/rust/pull/35734
8090 [35755]: https://github.com/rust-lang/rust/pull/35755
8091 [35761]: https://github.com/rust-lang/rust/pull/35761
8092 [35764]: https://github.com/rust-lang/rust/pull/35764
8093 [35814]: https://github.com/rust-lang/rust/pull/35814
8094 [35854]: https://github.com/rust-lang/rust/pull/35854
8095 [35871]: https://github.com/rust-lang/rust/pull/35871
8096 [35884]: https://github.com/rust-lang/rust/pull/35884
8097 [35911]: https://github.com/rust-lang/rust/pull/35911
8098 [35969]: https://github.com/rust-lang/rust/pull/35969
8099 [35975]: https://github.com/rust-lang/rust/pull/35975
8100 [36004]: https://github.com/rust-lang/rust/pull/36004
8101 [36008]: https://github.com/rust-lang/rust/pull/36008
8102 [36014]: https://github.com/rust-lang/rust/pull/36014
8103 [36029]: https://github.com/rust-lang/rust/pull/36029
8104 [36059]: https://github.com/rust-lang/rust/pull/36059
8105 [36072]: https://github.com/rust-lang/rust/pull/36072
8106 [36101]: https://github.com/rust-lang/rust/pull/36101
8107 [36104]: https://github.com/rust-lang/rust/pull/36104
8108 [36171]: https://github.com/rust-lang/rust/pull/36171
8109 [36173]: https://github.com/rust-lang/rust/pull/36173
8110 [36178]: https://github.com/rust-lang/rust/pull/36178
8111 [36213]: https://github.com/rust-lang/rust/pull/36213
8112 [36214]: https://github.com/rust-lang/rust/pull/36214
8113 [36264]: https://github.com/rust-lang/rust/pull/36264
8114 [36266]: https://github.com/rust-lang/rust/pull/36266
8115 [36289]: https://github.com/rust-lang/rust/pull/36289
8116 [36338]: https://github.com/rust-lang/rust/pull/36338
8117 [36351]: https://github.com/rust-lang/rust/pull/36351
8118 [36355]: https://github.com/rust-lang/rust/pull/36355
8119 [36369]: https://github.com/rust-lang/rust/pull/36369
8120 [36372]: https://github.com/rust-lang/rust/pull/36372
8121 [36423]: https://github.com/rust-lang/rust/pull/36423
8122 [36482]: https://github.com/rust-lang/rust/pull/36482
8123 [36505]: https://github.com/rust-lang/rust/pull/36505
8124 [36524]: https://github.com/rust-lang/rust/pull/36524
8125 [36527]: https://github.com/rust-lang/rust/pull/36527
8126 [36551]: https://github.com/rust-lang/rust/pull/36551
8127 [36574]: https://github.com/rust-lang/rust/pull/36574
8128 [36586]: https://github.com/rust-lang/rust/pull/36586
8129 [36592]: https://github.com/rust-lang/rust/pull/36592
8130 [36631]: https://github.com/rust-lang/rust/pull/36631
8131 [36721]: https://github.com/rust-lang/rust/pull/36721
8132 [36727]: https://github.com/rust-lang/rust/pull/36727
8133 [36730]: https://github.com/rust-lang/rust/pull/36730
8134 [36734]: https://github.com/rust-lang/rust/pull/36734
8135 [36754]: https://github.com/rust-lang/rust/pull/36754
8136 [36995]: https://github.com/rust-lang/rust/pull/36995
8137 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
8138 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
8139 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
8140 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
8141 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
8142 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
8143 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
8144 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
8145 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
8146 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
8147 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
8148 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
8149 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
8150 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
8151 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
8152 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
8153 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
8154 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
8155 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
8156 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
8157 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
8158 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
8159 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
8160 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
8161 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
8162 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
8163 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
8164 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
8165 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
8166 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
8167 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
8168 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
8171 Version 1.12.1 (2016-10-20)
8172 ===========================
8177 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
8178 * [Confusion with double negation and booleans][36856]
8179 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
8180 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
8181 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
8182 * [Corrupted memory after updated to 1.12][36936]
8183 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
8184 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
8185 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
8187 [36381]: https://github.com/rust-lang/rust/issues/36381
8188 [36856]: https://github.com/rust-lang/rust/issues/36856
8189 [36875]: https://github.com/rust-lang/rust/issues/36875
8190 [36924]: https://github.com/rust-lang/rust/issues/36924
8191 [36926]: https://github.com/rust-lang/rust/issues/36926
8192 [36936]: https://github.com/rust-lang/rust/issues/36936
8193 [37026]: https://github.com/rust-lang/rust/issues/37026
8194 [37112]: https://github.com/rust-lang/rust/issues/37112
8195 [37153]: https://github.com/rust-lang/rust/issues/37153
8198 Version 1.12.0 (2016-09-29)
8199 ===========================
8204 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8205 This translation pass is far simpler than the previous AST->LLVM pass, and
8206 creates opportunities to perform new optimizations directly on the MIR. It
8207 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8208 * [`rustc` presents a new, more readable error format, along with
8209 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8210 Most common editors supporting Rust have been updated to work with it. It was
8211 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8216 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8217 This translation pass is far simpler than the previous AST->LLVM pass, and
8218 creates opportunities to perform new optimizations directly on the MIR. It
8219 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8220 * [Print the Rust target name, not the LLVM target name, with
8221 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8222 * [The computation of `TypeId` is correct in some cases where it was previously
8223 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8224 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8225 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8226 `--print relocation-models`, and `--print code-models` print the available
8227 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8228 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8229 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8230 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8231 These targets produce statically-linked binaries. There are no binary release
8237 * [`rustc` presents a new, more readable error format, along with
8238 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8239 Most common editors supporting Rust have been updated to work with it. It was
8240 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8241 * [In error descriptions, references are now described in plain English,
8242 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8243 * [In error type descriptions, unknown numeric types are named `{integer}` or
8244 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8245 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8250 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8251 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8252 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8253 useful](https://github.com/rust-lang/rust/pull/34908)
8254 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8255 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8256 * [Semicolons are properly required as statement delimiters inside
8257 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8258 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8263 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8264 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8265 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8266 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8267 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8268 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8269 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8270 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8271 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8272 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8273 Both on Unix and Windows.
8274 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8275 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8276 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8277 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8278 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8279 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8280 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8281 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8286 * [The `format!` macro and friends now allow a single argument to be formatted
8287 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8288 * [The lifetime bounds on `[T]::binary_search_by` and
8289 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8290 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8291 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8292 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8293 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8294 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8295 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8296 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8297 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8298 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8299 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8300 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8301 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8302 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8303 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8304 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8305 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8306 * [`mpsc::sync_channel` `Receiver`s return any available message before
8307 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8308 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8309 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8314 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8315 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8316 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8317 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8318 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8319 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8320 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8321 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8322 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8323 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8324 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8325 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8326 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8327 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8328 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8329 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8334 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8335 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8340 * [Test binaries now support a `--test-threads` argument to specify the number
8341 of threads used to run tests, and which acts the same as the
8342 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8343 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8344 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8345 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8346 * [Rust releases now come with source packages that can be installed by rustup
8347 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8348 The resulting source code can be used by tools and IDES, located in the
8349 sysroot under `lib/rustlib/src`.
8354 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8355 * Many minor improvements to the documentation.
8356 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8361 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8362 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8363 * [When formatting strings, if "precision" is specified, the "fill",
8364 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8365 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8368 Version 1.11.0 (2016-08-18)
8369 ===========================
8374 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8375 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8376 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8377 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8382 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8383 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8384 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8385 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8386 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8387 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8388 (in libcore - previously stabilized in libstd)
8389 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8390 (in libcore - previously stabilized in libstd)
8391 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8392 (in libcore - previously stabilized in libstd)
8393 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8394 (in libcore - previously stabilized in libstd)
8395 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8396 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8397 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8398 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8403 * [The `thread_local!` macro supports multiple definitions in a single
8404 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8405 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8406 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8407 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8408 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8409 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8410 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8411 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8416 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8417 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8418 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8419 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8420 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8421 and `-vv` prints warnings for all crates.
8422 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8423 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8424 This provides room for expansion by arbitrary tools.
8425 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8426 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8427 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8428 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8429 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8430 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8431 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8436 * [Caching projections speeds up type check dramatically for some
8437 workloads](https://github.com/rust-lang/rust/pull/33816)
8438 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8439 This hasher is faster, but is believed to provide sufficient
8440 protection from collision attacks.
8441 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8446 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8447 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8448 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8449 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8450 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8455 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8456 * [When emitting debug info, rustc emits frame pointers for closures,
8457 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8458 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8459 * Many more errors have been given error codes and extended
8461 * API documentation continues to be improved, with many new examples
8466 * [rustc no longer hangs when dependencies recursively re-export
8467 submodules](https://github.com/rust-lang/rust/pull/34542)
8468 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8469 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8470 rewritten](https://github.com/rust-lang/rust/pull/33895)
8471 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8472 No targets use this yet, but it works toward AVR support.
8477 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8478 * [The new follow-set rules that place restrictions on `macro_rules!`
8479 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8480 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8481 and has been a warning since 1.10.
8482 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8483 This causes breakage in some corner cases.
8486 Version 1.10.0 (2016-07-07)
8487 ===========================
8492 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8493 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8494 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8495 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8496 * [`panic!` can be converted to a runtime abort with the
8497 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8498 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8499 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8500 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8501 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8502 Note that Cargo does not yet directly support cdylibs.
8507 * `os::windows::fs::OpenOptionsExt::access_mode`
8508 * `os::windows::fs::OpenOptionsExt::share_mode`
8509 * `os::windows::fs::OpenOptionsExt::custom_flags`
8510 * `os::windows::fs::OpenOptionsExt::attributes`
8511 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8512 * `os::unix::fs::OpenOptionsExt::custom_flags`
8513 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8514 * `Default for sync::Weak`
8515 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8516 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8517 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8518 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8519 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8520 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8521 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8522 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8523 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8524 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8525 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8526 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8527 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8528 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8529 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8530 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8531 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8532 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8533 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8534 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8535 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8536 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8537 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8538 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8539 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8540 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8541 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8542 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8543 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8544 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8545 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8546 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8547 * Read/Write/RawFd impls for `UnixStream`
8548 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8549 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8550 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8551 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8552 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8553 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8554 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8555 * RawFd impls for `UnixListener`
8556 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8557 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8558 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8559 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8560 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8561 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8562 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8563 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8564 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8565 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8566 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8567 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8568 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8569 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8570 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8571 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8572 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8573 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8574 * RawFd impls for `UnixDatagram`
8575 * `{BTree,Hash}Map::values_mut`
8576 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8581 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8582 The semantics of this minor method are subtle and probably not what
8584 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8585 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8586 will fall back to `/dev/urandom` temporarily to avoid blocking
8587 during early boot](https://github.com/rust-lang/rust/pull/33086).
8588 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8589 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8590 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8591 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8592 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8593 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8594 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8598 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8599 This controls the runtime behavior of the `panic!` macro
8600 and can be either "unwind" (the default), or "abort".
8601 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8602 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8603 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8604 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8605 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8606 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8607 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8608 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8609 By default they are retried twice, which can be customized with the
8610 `net.retry` value in `.cargo/config`.
8611 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8612 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8613 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8614 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8615 Makes it possible to install multiple crates in parallel.
8616 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8617 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8618 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8619 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8620 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8621 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8626 * [rustc memory usage was reduced by refactoring the context used for
8627 type checking](https://github.com/rust-lang/rust/pull/33425).
8628 * [Speed up creation of `HashMap`s by caching the random keys used
8629 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8630 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8631 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8632 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8633 10x faster than the previous lookup tables.
8634 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8639 * Many incremental improvements to documentation and rustdoc.
8640 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8641 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8642 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8643 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8644 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8645 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8646 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8651 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8652 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8653 * [`std` no longer prints backtraces on platforms where the running
8654 module must be loaded with `env::current_exe`, which can't be relied
8655 on](https://github.com/rust-lang/rust/pull/33554).
8656 * This release includes std binaries for the i586-unknown-linux-gnu,
8657 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8658 i586 target is for old x86 hardware without SSE2, and the armv7
8659 target is for Android running on modern ARM architectures.
8660 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8661 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8662 * [On Unix the runtime aborts by calling `libc::abort` instead of
8663 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8664 * [Rust is now bootstrapped from the previous release of Rust,
8665 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8670 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8671 * [`target_env` for Linux ARM targets is just `gnu`, not
8672 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8673 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8674 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8675 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8676 Affects how macros are parsed.
8677 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8678 * [Feature-gated attributes on macro-generated macro invocations are
8679 now rejected](https://github.com/rust-lang/rust/pull/32791).
8680 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8681 This caused some minor changes to type inference.
8684 Version 1.9.0 (2016-05-26)
8685 ==========================
8690 * The `#[deprecated]` attribute when applied to an API will generate
8691 warnings when used. The warnings may be suppressed with
8692 `#[allow(deprecated)]`. [RFC 1270].
8693 * [`fn` item types are zero sized, and each `fn` names a unique
8694 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8695 `transmute` on a `fn` type will generate a warning for a few cycles,
8696 then will be converted to an error.
8697 * [Field and method resolution understand visibility, so private
8698 fields and methods cannot prevent the proper use of public fields
8699 and methods][1.9fv].
8700 * [The parser considers unicode codepoints in the
8701 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8707 * [`std::panic::catch_unwind`] (renamed from `recover`)
8708 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8709 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8710 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8711 * [`str::is_char_boundary`]
8712 * [`<*const T>::as_ref`]
8713 * [`<*mut T>::as_ref`]
8714 * [`<*mut T>::as_mut`]
8715 * [`AsciiExt::make_ascii_uppercase`]
8716 * [`AsciiExt::make_ascii_lowercase`]
8717 * [`char::decode_utf16`]
8718 * [`char::DecodeUtf16`]
8719 * [`char::DecodeUtf16Error`]
8720 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8721 * [`BTreeSet::take`]
8722 * [`BTreeSet::replace`]
8725 * [`HashSet::replace`]
8727 * [`OsString::with_capacity`]
8728 * [`OsString::clear`]
8729 * [`OsString::capacity`]
8730 * [`OsString::reserve`]
8731 * [`OsString::reserve_exact`]
8732 * [`OsStr::is_empty`]
8734 * [`std::os::unix::thread`]
8737 * [`JoinHandleExt::as_pthread_t`]
8738 * [`JoinHandleExt::into_pthread_t`]
8739 * [`HashSet::hasher`]
8740 * [`HashMap::hasher`]
8741 * [`CommandExt::exec`]
8742 * [`File::try_clone`]
8743 * [`SocketAddr::set_ip`]
8744 * [`SocketAddr::set_port`]
8745 * [`SocketAddrV4::set_ip`]
8746 * [`SocketAddrV4::set_port`]
8747 * [`SocketAddrV6::set_ip`]
8748 * [`SocketAddrV6::set_port`]
8749 * [`SocketAddrV6::set_flowinfo`]
8750 * [`SocketAddrV6::set_scope_id`]
8751 * [`slice::copy_from_slice`]
8752 * [`ptr::read_volatile`]
8753 * [`ptr::write_volatile`]
8754 * [`OpenOptions::create_new`]
8755 * [`TcpStream::set_nodelay`]
8756 * [`TcpStream::nodelay`]
8757 * [`TcpStream::set_ttl`]
8758 * [`TcpStream::ttl`]
8759 * [`TcpStream::set_only_v6`]
8760 * [`TcpStream::only_v6`]
8761 * [`TcpStream::take_error`]
8762 * [`TcpStream::set_nonblocking`]
8763 * [`TcpListener::set_ttl`]
8764 * [`TcpListener::ttl`]
8765 * [`TcpListener::set_only_v6`]
8766 * [`TcpListener::only_v6`]
8767 * [`TcpListener::take_error`]
8768 * [`TcpListener::set_nonblocking`]
8769 * [`UdpSocket::set_broadcast`]
8770 * [`UdpSocket::broadcast`]
8771 * [`UdpSocket::set_multicast_loop_v4`]
8772 * [`UdpSocket::multicast_loop_v4`]
8773 * [`UdpSocket::set_multicast_ttl_v4`]
8774 * [`UdpSocket::multicast_ttl_v4`]
8775 * [`UdpSocket::set_multicast_loop_v6`]
8776 * [`UdpSocket::multicast_loop_v6`]
8777 * [`UdpSocket::set_multicast_ttl_v6`]
8778 * [`UdpSocket::multicast_ttl_v6`]
8779 * [`UdpSocket::set_ttl`]
8780 * [`UdpSocket::ttl`]
8781 * [`UdpSocket::set_only_v6`]
8782 * [`UdpSocket::only_v6`]
8783 * [`UdpSocket::join_multicast_v4`]
8784 * [`UdpSocket::join_multicast_v6`]
8785 * [`UdpSocket::leave_multicast_v4`]
8786 * [`UdpSocket::leave_multicast_v6`]
8787 * [`UdpSocket::take_error`]
8788 * [`UdpSocket::connect`]
8789 * [`UdpSocket::send`]
8790 * [`UdpSocket::recv`]
8791 * [`UdpSocket::set_nonblocking`]
8796 * [`std::sync::Once` is poisoned if its initialization function
8798 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8799 * [Most types implement `fmt::Debug`][1.9db].
8800 * [The default buffer size used by `BufReader` and `BufWriter` was
8801 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8802 used by other languages.
8803 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8804 `Duration` additionally implements `*=` and `/=`][1.9ta].
8805 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8806 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8807 * [`Chain` implements `BufRead`][1.9ch].
8808 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8813 * [Cargo can now run concurrently][1.9cc].
8814 * [Top-level overrides allow specific revisions of crates to be
8815 overridden through the entire crate graph][1.9ct]. This is intended
8816 to make upgrades easier for large projects, by allowing crates to be
8817 forked temporarily until they've been upgraded and republished.
8818 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8819 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8820 on the commandline][1.9cf]. `rustc` arguments can also be specified
8821 in the `build.rustflags` configuration key.
8826 * [The time complexity of comparing variables for equivalence during type
8827 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8828 to major compilation time improvement in some scenarios.
8829 * [`ToString` is specialized for `str`, giving it the same performance
8830 as `to_owned`][1.9ts].
8831 * [Spawning processes with `Command::output` no longer creates extra
8833 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8834 for C-like enums][1.9cl].
8839 * [Passing the `--quiet` flag to a test runner will produce
8840 much-abbreviated output][1.9q].
8841 * The Rust Project now publishes std binaries for the
8842 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8843 `i586-pc-windows-msvc` targets.
8848 * [`std::sync::Once` is poisoned if its initialization function
8850 * [It is illegal to define methods with the same name in overlapping
8851 inherent `impl` blocks][1.9sn].
8852 * [`fn` item types are zero sized, and each `fn` names a unique
8853 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8854 `transmute` on a `fn` type will generate a warning for a few cycles,
8855 then will be converted to an error.
8856 * [Improvements to const evaluation may trigger new errors when integer
8857 literals are out of range][1.9ce].
8860 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8861 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8862 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8863 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8864 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8865 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8866 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8867 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8868 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8869 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8870 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8871 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8872 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8873 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8874 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8875 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8876 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8877 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8878 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8879 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8880 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8881 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8882 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8883 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8884 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8885 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8886 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8887 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8888 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8889 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8890 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8891 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8892 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8893 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8894 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8895 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8896 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8897 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8898 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8899 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8900 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8901 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8902 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8903 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8904 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8905 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8906 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8907 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8908 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8909 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8910 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8911 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8912 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8913 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8914 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8915 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8916 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8917 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8918 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8919 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8920 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8921 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8922 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8923 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8924 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8925 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8926 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8927 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8928 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8929 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8930 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8931 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8932 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8933 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8934 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8935 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8936 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8937 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8938 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8939 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8940 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8941 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8942 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8943 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8944 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8945 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8946 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8947 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8948 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8949 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8950 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8951 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8952 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8953 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8954 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8955 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8956 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8957 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8958 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8959 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8960 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8961 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8962 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8963 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8964 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8965 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8966 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8967 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8968 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8969 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8972 Version 1.8.0 (2016-04-14)
8973 ==========================
8978 * Rust supports overloading of compound assignment statements like
8979 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8980 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8981 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8983 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8984 addition to the non-braced form, `struct Foo;`. [RFC 218].
8990 * [`str::encode_utf16`] (renamed from `utf16_units`)
8991 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8994 * [`ptr::drop_in_place`]
8996 * [`time::SystemTime`]
8998 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8999 * [`Instant::elapsed`]
9000 * [`SystemTime::now`]
9001 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
9002 * [`SystemTime::elapsed`]
9003 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
9004 * [`SystemTimeError`]
9005 * [`SystemTimeError::duration`]
9006 * Various impls for `SystemTimeError`
9008 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
9009 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
9010 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
9011 * [The `write!` and `writeln!` macros correctly emit errors if any of
9012 their arguments can't be formatted][1.8w].
9013 * [Various I/O functions support large files on 32-bit Linux][1.8l].
9014 * [The Unix-specific `raw` modules, which contain a number of
9015 redefined C types are deprecated][1.8r], including `os::raw::unix`,
9016 `os::raw::macos`, and `os::raw::linux`. These modules defined types
9017 such as `ino_t` and `dev_t`. The inconsistency of these definitions
9018 across platforms was making it difficult to implement `std`
9019 correctly. Those that need these definitions should use the `libc`
9021 * The Unix-specific `MetadataExt` traits, including
9022 `os::unix::fs::MetadataExt`, which expose values such as inode
9023 numbers [no longer return platform-specific types][1.8r], but
9024 instead return widened integers. [RFC 1415].
9025 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
9026 * [Atomic loads and stores are not volatile][1.8a].
9027 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
9032 * [Inlining hash functions lead to a 3% compile-time improvement in
9033 some workloads][1.8h].
9034 * When using jemalloc, its symbols are [unprefixed so that it
9035 overrides the libc malloc implementation][1.8h]. This means that for
9036 rustc, LLVM is now using jemalloc, which results in a 6%
9037 compile-time improvement on a specific workload.
9038 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
9043 * [32-bit MSVC builds finally implement unwinding][1.8ms].
9044 i686-pc-windows-msvc is now considered a tier-1 platform.
9045 * [The `--print targets` flag prints a list of supported targets][1.8t].
9046 * [The `--print cfg` flag prints the `cfg`s defined for the current
9048 * [`rustc` can be built with an new Cargo-based build system, written
9049 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
9050 build system. To enable it configure with `configure --rustbuild`.
9051 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
9052 variants while also indicating the total number of missing variants
9053 if more than 3][1.8m].
9054 * [Executable stacks are disabled on Linux and BSD][1.8nx].
9055 * The Rust Project now publishes binary releases of the standard
9056 library for a number of tier-2 targets:
9057 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
9058 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
9059 `x86_64-rumprun-netbsd`. These can be installed with
9060 tools such as [multirust][1.8mr].
9065 * [`cargo init` creates a new Cargo project in the current
9066 directory][1.8ci]. It is otherwise like `cargo new`.
9067 * [Cargo has configuration keys for `-v` and
9068 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
9069 `[term]` section of `.cargo/config`.
9070 * [Configuration keys that evaluate to strings or integers can be set
9071 via environment variables][1.8ce]. For example the `build.jobs` key
9072 can be set via `CARGO_BUILD_JOBS`. Environment variables take
9073 precedence over config files.
9074 * [Target-specific dependencies support Rust `cfg` syntax for
9075 describing targets][1.8cfg] so that dependencies for multiple
9076 targets can be specified together. [RFC 1361].
9077 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
9078 `RUSTDOC` take precedence over the `build.target-dir`,
9079 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
9080 * [The child process tree is killed on Windows when Cargo is
9082 * [The `build.target` configuration value sets the target platform,
9083 like `--target`][1.8ct].
9088 * [Unstable compiler flags have been further restricted][1.8u]. Since
9089 1.0 `-Z` flags have been considered unstable, and other flags that
9090 were considered unstable additionally required passing `-Z
9091 unstable-options` to access. Unlike unstable language and library
9092 features though, these options have been accessible on the stable
9093 release channel. Going forward, *new unstable flags will not be
9094 available on the stable release channel*, and old unstable flags
9095 will warn about their usage. In the future, all unstable flags will
9096 be unavailable on the stable release channel.
9097 * [It is no longer possible to `match` on empty enum variants using
9098 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
9099 * The Unix-specific `MetadataExt` traits, including
9100 `os::unix::fs::MetadataExt`, which expose values such as inode
9101 numbers [no longer return platform-specific types][1.8r], but
9102 instead return widened integers. [RFC 1415].
9103 * [Modules sourced from the filesystem cannot appear within arbitrary
9104 blocks, but only within other modules][1.8mf].
9105 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
9106 * On Unix, [stack overflow triggers a runtime abort instead of a
9108 * [`Command::spawn` and its equivalents return an error if any of
9109 its command-line arguments contain interior `NUL`s][1.8n].
9110 * [Tuple and unit enum variants from other crates are in the type
9112 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
9113 type instead of `.a` files][1.8st]. Additionally, for the MSVC
9114 toolchain, `rustc` emits import libraries named `foo.dll.lib`
9115 instead of `foo.lib`.
9118 [1.8a]: https://github.com/rust-lang/rust/pull/30962
9119 [1.8b]: https://github.com/rust-lang/rust/pull/31123
9120 [1.8c]: https://github.com/rust-lang/rust/pull/31530
9121 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
9122 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
9123 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
9124 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
9125 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
9126 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
9127 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
9128 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
9129 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
9130 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
9131 [1.8h]: https://github.com/rust-lang/rust/pull/31460
9132 [1.8l]: https://github.com/rust-lang/rust/pull/31668
9133 [1.8m]: https://github.com/rust-lang/rust/pull/31020
9134 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
9135 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
9136 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
9137 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
9138 [1.8n]: https://github.com/rust-lang/rust/pull/31056
9139 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
9140 [1.8r]: https://github.com/rust-lang/rust/pull/31551
9141 [1.8so]: https://github.com/rust-lang/rust/pull/31333
9142 [1.8st]: https://github.com/rust-lang/rust/pull/29520
9143 [1.8t]: https://github.com/rust-lang/rust/pull/31358
9144 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
9145 [1.8u]: https://github.com/rust-lang/rust/pull/31793
9146 [1.8v]: https://github.com/rust-lang/rust/pull/31757
9147 [1.8w]: https://github.com/rust-lang/rust/pull/31904
9148 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
9149 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
9150 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
9151 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
9152 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
9153 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
9154 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
9155 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
9156 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
9157 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
9158 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
9159 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
9160 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
9161 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
9162 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
9163 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
9164 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
9165 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
9166 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
9167 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
9168 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
9169 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
9170 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
9171 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
9172 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
9173 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
9174 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
9175 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
9176 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
9177 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
9180 Version 1.7.0 (2016-03-03)
9181 ==========================
9188 * [`Path::strip_prefix`] (renamed from relative_from)
9189 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
9191 * [`Ipv4Addr::is_loopback`]
9192 * [`Ipv4Addr::is_private`]
9193 * [`Ipv4Addr::is_link_local`]
9194 * [`Ipv4Addr::is_multicast`]
9195 * [`Ipv4Addr::is_broadcast`]
9196 * [`Ipv4Addr::is_documentation`]
9198 * [`Ipv6Addr::is_unspecified`]
9199 * [`Ipv6Addr::is_loopback`]
9200 * [`Ipv6Addr::is_multicast`]
9203 * [`Vec::as_mut_slice`]
9205 * [`String::as_str`]
9206 * [`String::as_mut_str`]
9208 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9210 * `<[T]>::`[`sort_by_key`]
9211 * checked, saturated, and overflowing operations
9212 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9213 * [`i32::saturating_mul`]
9214 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9215 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9216 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9217 * [`u32::saturating_mul`]
9218 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9219 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9220 * and checked, saturated, and overflowing operations for other primitive types
9222 * [`ffi::IntoStringError`]
9223 * [`CString::into_string`]
9224 * [`CString::into_bytes`]
9225 * [`CString::into_bytes_with_nul`]
9226 * `From<CString> for Vec<u8>`
9228 * [`IntoStringError::into_cstring`]
9229 * [`IntoStringError::utf8_error`]
9230 * `Error for IntoStringError`
9232 * [`std::hash::BuildHasher`]
9233 * [`BuildHasher::Hasher`]
9234 * [`BuildHasher::build_hasher`]
9235 * [`std::hash::BuildHasherDefault`]
9236 * [`HashMap::with_hasher`]
9237 * [`HashMap::with_capacity_and_hasher`]
9238 * [`HashSet::with_hasher`]
9239 * [`HashSet::with_capacity_and_hasher`]
9240 * [`std::collections::hash_map::RandomState`]
9241 * [`RandomState::new`]
9242 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9243 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9244 from bytes is faster.
9245 * [The performance of `LineWriter` (and thus `io::stdout`) was
9246 improved by using `memchr` to search for newlines][1.7m].
9247 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9248 `f64` variants were stabilized previously.
9249 * [`BTreeMap` was rewritten to use less memory and improve the performance
9250 of insertion and iteration, the latter by as much as 5x][1.7bm].
9251 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9252 covariant over their contained type][1.7bt].
9253 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9254 over their contained type][1.7ll].
9255 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9257 * [`Any` is implemented for unsized types][1.7a].
9258 * [`Hash` is implemented for `Duration`][1.7h].
9263 * [When running tests with `--test`, rustdoc will pass `--cfg`
9264 arguments to the compiler][1.7dt].
9265 * [The compiler is built with RPATH information by default][1.7rpa].
9266 This means that it will be possible to run `rustc` when installed in
9267 unusual configurations without configuring the dynamic linker search
9269 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9270 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9271 over `LD_LIBRARY_PATH`.
9276 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9277 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9278 * [The `rerun-if-changed` build script directive no longer causes the
9279 build script to incorrectly run twice in certain scenarios][1.7rr].
9284 * Soundness fixes to the interactions between associated types and
9285 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9286 code that violates the new rules. This is a significant change that
9287 is known to break existing code, so it has emitted warnings for the
9288 new error cases since 1.4 to give crate authors time to adapt. The
9289 details of what is changing are subtle; read the RFC for more.
9290 * [Several bugs in the compiler's visibility calculations were
9291 fixed][1.7v]. Since this was found to break significant amounts of
9292 code, the new errors will be emitted as warnings for several release
9293 cycles, under the `private_in_public` lint.
9294 * Defaulted type parameters were accidentally accepted in positions
9295 that were not intended. In this release, [defaulted type parameters
9296 appearing outside of type definitions will generate a
9297 warning][1.7d], which will become an error in future releases.
9298 * [Parsing "." as a float results in an error instead of 0][1.7p].
9299 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9300 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9302 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9303 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9304 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9305 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9306 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9307 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9308 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9309 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9310 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9311 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9312 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9313 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9314 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9315 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9316 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9317 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9318 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9319 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9320 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9321 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9322 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9323 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9324 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9325 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9326 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9327 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9328 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9329 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9330 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9331 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9332 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9333 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9334 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9335 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9336 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9337 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9338 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9339 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9340 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9341 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9342 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9343 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9344 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9345 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9346 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9347 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9348 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9349 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9350 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9351 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9352 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9353 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9354 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9355 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9356 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9357 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9358 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9359 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9360 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9361 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9362 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9363 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9364 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9365 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9366 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9367 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9368 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9369 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9370 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9371 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9372 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9373 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9374 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9375 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9376 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9377 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9378 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9379 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9380 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9383 Version 1.6.0 (2016-01-21)
9384 ==========================
9389 * The `#![no_std]` attribute causes a crate to not be linked to the
9390 standard library, but only the [core library][1.6co], as described
9391 in [RFC 1184]. The core library defines common types and traits but
9392 has no platform dependencies whatsoever, and is the basis for Rust
9393 software in environments that cannot support a full port of the
9394 standard library, such as operating systems. Most of the core
9395 library is now stable.
9401 [`Read::read_exact`],
9402 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9403 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9404 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9405 [`os::unix::fs::DirBuilderExt`],
9406 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9407 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9408 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9409 [`collections::hash_map::Drain`],
9410 [`collections::hash_map::HashMap::drain`],
9411 [`collections::hash_set::Drain`],
9412 [`collections::hash_set::HashSet::drain`],
9413 [`collections::binary_heap::Drain`],
9414 [`collections::binary_heap::BinaryHeap::drain`],
9415 [`Vec::extend_from_slice`] (renamed from `push_all`),
9416 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9417 [`RwLock::into_inner`],
9418 [`Iterator::min_by_key`] (renamed from `min_by`),
9419 [`Iterator::max_by_key`] (renamed from `max_by`).
9420 * The [core library][1.6co] is stable, as are most of its APIs.
9421 * [The `assert_eq!` macro supports arguments that don't implement
9422 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9424 * Several timer functions that take duration in milliseconds [are
9425 deprecated in favor of those that take `Duration`][1.6ms]. These
9426 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9427 `thread::park_timeout_ms`.
9428 * The algorithm by which `Vec` reserves additional elements was
9429 [tweaked to not allocate excessive space][1.6a] while still growing
9431 * `From` conversions are [implemented from integers to floats][1.6f]
9432 in cases where the conversion is lossless. Thus they are not
9433 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9434 or `f64`. They are also not implemented for `isize` and `usize`
9435 because the implementations would be platform-specific. `From` is
9436 also implemented from `f32` to `f64`.
9437 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9438 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9439 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9440 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9442 * Sorting slices that are already sorted [is 50% faster in some
9448 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9449 * Cargo build scripts can specify their dependencies by emitting the
9450 [`rerun-if-changed`][1.6rr] key.
9451 * crates.io will reject publication of crates with dependencies that
9452 have a wildcard version constraint. Crates with wildcard
9453 dependencies were seen to cause a variety of problems, as described
9454 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9456 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9457 release folder. A variety of artifacts that Cargo failed to clean
9458 are now correctly deleted.
9463 * The `unreachable_code` lint [warns when a function call's argument
9465 * The parser indicates [failures that may be caused by
9466 confusingly-similar Unicode characters][1.6uc]
9467 * Certain macro errors [are reported at definition time][1.6m], not
9473 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9474 environment variable when locating crates. This was a pre-cargo
9475 feature for integrating with the package manager that was
9476 accidentally never removed.
9477 * [A number of bugs were fixed in the privacy checker][1.6p] that
9478 could cause previously-accepted code to break.
9479 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9480 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9481 struct pattern syntax (`Foo(..)`) can no longer be used to match
9482 unit structs. This is a warning now, but will become an error in
9483 future releases. Patterns that share the same name as a const are
9485 * A bug was fixed that causes [rustc not to apply default type
9486 parameters][1.6xc] when resolving certain method implementations of
9487 traits defined in other crates.
9489 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9490 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9491 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9492 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9493 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9494 [1.6co]: http://doc.rust-lang.org/core/index.html
9495 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9496 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9497 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9498 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9499 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9500 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9501 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9502 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9503 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9504 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9505 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9506 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9507 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9508 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9509 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9510 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9511 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9512 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9513 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9514 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9515 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9516 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9517 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9518 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9519 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9520 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9521 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9522 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9523 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9524 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9525 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9526 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9527 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9528 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9529 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9530 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9531 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9532 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9533 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9534 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9535 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9538 Version 1.5.0 (2015-12-10)
9539 ==========================
9541 * ~700 changes, numerous bugfixes
9547 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9548 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9549 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9550 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9551 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9552 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9553 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9554 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9555 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9556 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9557 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9558 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9559 [`Path::read_link`], [`Path::symlink_metadata`],
9560 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9561 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9562 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9563 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9564 [`slice::split_first_mut`], [`slice::split_first`],
9565 [`slice::split_last_mut`], [`slice::split_last`],
9566 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9567 [`str::MatchIndices`], [`str::RMatchIndices`],
9568 [`str::match_indices`], [`str::rmatch_indices`],
9569 [`str::slice_mut_unchecked`], [`string::ParseError`].
9570 * Rust applications hosted on crates.io can be installed locally to
9571 `~/.cargo/bin` with the [`cargo install`] command. Among other
9572 things this makes it easier to augment Cargo with new subcommands:
9573 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9574 invoked as `cargo foo`.
9575 * Crates with wildcard (`*`) dependencies will [emit warnings when
9576 published][1.5w]. In 1.6 it will no longer be possible to publish
9577 crates with wildcard dependencies.
9582 * The rules determining when a particular lifetime must outlive
9583 a particular value (known as '[dropck]') have been [modified
9584 to not rely on parametricity][1.5p].
9585 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9586 and `Arc`][1.5a]. Because these smart pointer types implement
9587 `Deref`, this causes breakage in cases where the interior type
9588 contains methods of the same name.
9589 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9590 that they could drop their content. Soundness fix.
9591 * All method invocations are [properly checked][1.5wf1] for
9592 [well-formedness][1.5wf2]. Soundness fix.
9593 * Traits whose supertraits contain `Self` are [not object
9594 safe][1.5o]. Soundness fix.
9595 * Target specifications support a [`no_default_libraries`][1.5nd]
9596 setting that controls whether `-nodefaultlibs` is passed to the
9597 linker, and in turn the `is_like_windows` setting no longer affects
9598 the `-nodefaultlibs` flag.
9599 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9600 * The `#[inline]` and `#[repr]` attributes [can only appear
9601 in valid locations][1.5at].
9602 * Native libraries linked from the local crate are [passed to
9603 the linker before native libraries from upstream crates][1.5nl].
9604 * Two rarely-used attributes, `#[no_debug]` and
9605 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9606 * Negation of unsigned integers, which has been a warning for
9607 several releases, [is now behind a feature gate and will
9608 generate errors][1.5nu].
9609 * The parser accidentally accepted visibility modifiers on
9610 enum variants, a bug [which has been fixed][1.5ev].
9611 * [A bug was fixed that allowed `use` statements to import unstable
9617 * When evaluating expressions at compile-time that are not
9618 compile-time constants (const-evaluating expressions in non-const
9619 contexts), incorrect code such as overlong bitshifts and arithmetic
9620 overflow will [generate a warning instead of an error][1.5ce],
9621 delaying the error until runtime. This will allow the
9622 const-evaluator to be expanded in the future backwards-compatibly.
9623 * The `improper_ctypes` lint [no longer warns about using `isize` and
9624 `usize` in FFI][1.5ict].
9629 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9631 * `Default` is [implemented for mutable slices][1.5d].
9632 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9633 * There are now `From` conversions [between floating point
9634 types][1.5f] where the conversions are lossless.
9635 * There are now `From` conversions [between integer types][1.5i] where
9636 the conversions are lossless.
9637 * [`fs::Metadata` implements `Clone`][1.5fs].
9638 * The `parse` method [accepts a leading "+" when parsing
9640 * [`AsMut` is implemented for `Vec`][1.5am].
9641 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9642 been optimized][1.5cf] and no longer rely on the default impl.
9643 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9644 `unsafe extern "C"` function types now [implement `Clone`,
9645 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9646 `fmt::Debug` for up to 12 arguments][1.5fp].
9647 * [Dropping `Vec`s is much faster in unoptimized builds when the
9648 element types don't implement `Drop`][1.5dv].
9649 * A bug that caused in incorrect behavior when [combining `VecDeque`
9650 with zero-sized types][1.5vdz] was resolved.
9651 * [`PartialOrd` for slices is faster][1.5po].
9656 * [Crate metadata size was reduced by 20%][1.5md].
9657 * [Improvements to code generation reduced the size of libcore by 3.3
9658 MB and rustc's memory usage by 18MB][1.5m].
9659 * [Improvements to deref translation increased performance in
9660 unoptimized builds][1.5dr].
9661 * Various errors in trait resolution [are deduplicated to only be
9662 reported once][1.5te].
9663 * Rust has preliminary [support for rumprun kernels][1.5rr].
9664 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9666 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9667 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9668 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9669 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9670 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9671 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9672 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9673 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9674 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9675 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9676 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9677 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9678 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9679 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9680 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9681 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9682 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9683 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9684 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9685 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9686 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9687 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9688 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9689 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9690 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9691 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9692 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9693 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9694 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9695 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9696 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9697 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9698 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9699 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9700 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9701 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9702 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9703 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9704 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9705 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9706 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9707 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9708 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9709 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9710 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9711 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9712 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9713 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9714 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9715 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9716 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9717 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9718 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9719 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9720 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9721 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9722 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9723 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9724 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9725 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9726 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9727 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9728 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9729 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9730 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9731 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9732 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9733 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9734 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9735 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9736 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9737 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9738 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9739 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9740 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9741 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9742 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9743 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9744 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9745 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9746 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9747 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9748 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9749 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9750 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9751 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9752 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9753 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9754 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9756 Version 1.4.0 (2015-10-29)
9757 ==========================
9759 * ~1200 changes, numerous bugfixes
9764 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9765 GNU) are now supported and recommended for use.
9770 * [Several changes have been made to fix type soundness and improve
9771 the behavior of associated types][sound]. See [RFC 1214]. Although
9772 we have mostly introduced these changes as warnings this release, to
9773 become errors next release, there are still some scenarios that will
9774 see immediate breakage.
9775 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9776 line breaks in addition to `\n`][crlf].
9777 * [Loans of `'static` lifetime extend to the end of a function][stat].
9778 * [`str::parse` no longer introduces avoidable rounding error when
9779 parsing floating point numbers. Together with earlier changes to
9780 float formatting/output, "round trips" like f.to_string().parse()
9781 now preserve the value of f exactly. Additionally, leading plus
9782 signs are now accepted][fp3].
9788 * `use` statements that import multiple items [can now rename
9789 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9790 * [Binops work correctly on fat pointers][binfat].
9791 * `pub extern crate`, which does not behave as expected, [issues a
9792 warning][pec] until a better solution is found.
9797 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9798 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9799 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9800 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9801 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9802 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9803 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9804 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9805 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9806 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9807 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9808 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9809 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9810 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9811 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9812 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9813 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9814 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9816 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9817 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9818 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9819 `f64::from_str_radix`.
9820 * [Reverse-searching strings is faster with the 'two-way'
9822 * [`std::io::copy` allows `?Sized` arguments][cc].
9823 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9824 [override `count`, `nth` and `last` with an *O*(1)
9825 implementation][it].
9826 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9827 * [`IntoRawFd` has been added to the Unix-specific prelude,
9828 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9830 * [`Extend<String>` and `FromIterator<String` are both implemented for
9832 * [`IntoIterator` is implemented for references to `Option` and
9834 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9835 Copy`][ext] as part of [RFC 839]. This will cause type inference
9836 breakage in rare situations.
9837 * [`BinaryHeap` implements `Debug`][bh2].
9838 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9840 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9841 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9842 * [String comparison is faster][faststr].
9843 * `&mut T` where `T: std::fmt::Write` [also implements
9844 `std::fmt::Write`][mutw].
9845 * [A stable regression in `VecDeque::push_back` and other
9846 capacity-altering methods that caused panics for zero-sized types
9848 * [Function pointers implement traits for up to 12 parameters][fp2].
9853 * The compiler [no longer uses the 'morestack' feature to prevent
9854 stack overflow][mm]. Instead it uses guard pages and stack
9855 probes (though stack probes are not yet implemented on any platform
9857 * [The compiler matches traits faster when projections are involved][p].
9858 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9860 * [Cargo now displays useful information about what its doing during
9861 `cargo update`][cu].
9863 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9864 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9865 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9866 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9867 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9868 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9869 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9870 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9871 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9872 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9873 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9874 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9875 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9876 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9877 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9878 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9879 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9880 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9881 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9882 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9883 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9884 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9885 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9886 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9887 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9888 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9889 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9890 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9891 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9892 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9893 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9894 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9895 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9896 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9897 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9898 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9899 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9900 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9901 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9902 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9903 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9904 [bh2]: https://github.com/rust-lang/rust/pull/28156
9905 [binfat]: https://github.com/rust-lang/rust/pull/28270
9906 [bm]: https://github.com/rust-lang/rust/pull/28197
9907 [cc]: https://github.com/rust-lang/rust/pull/27531
9908 [crlf]: https://github.com/rust-lang/rust/pull/28034
9909 [cu]: https://github.com/rust-lang/cargo/pull/1931
9910 [d]: https://github.com/rust-lang/rust/pull/27825
9911 [dep]: https://github.com/rust-lang/rust/pull/28339
9912 [es]: https://github.com/rust-lang/rust/pull/27956
9913 [ext]: https://github.com/rust-lang/rust/pull/28094
9914 [faststr]: https://github.com/rust-lang/rust/pull/28338
9915 [ffi]: https://github.com/rust-lang/rust/pull/28779
9916 [fp]: https://github.com/rust-lang/rust/pull/28268
9917 [fp2]: https://github.com/rust-lang/rust/pull/28560
9918 [fp3]: https://github.com/rust-lang/rust/pull/27307
9919 [i]: https://github.com/rust-lang/rust/pull/27451
9920 [into2]: https://github.com/rust-lang/rust/pull/28039
9921 [it]: https://github.com/rust-lang/rust/pull/27652
9922 [mm]: https://github.com/rust-lang/rust/pull/27338
9923 [mutw]: https://github.com/rust-lang/rust/pull/28368
9924 [sound]: https://github.com/rust-lang/rust/pull/27641
9925 [p]: https://github.com/rust-lang/rust/pull/27866
9926 [pec]: https://github.com/rust-lang/rust/pull/28486
9927 [pr]: https://github.com/rust-lang/rust/pull/27896
9928 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9929 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9930 [s]: https://github.com/rust-lang/rust/pull/27474
9931 [stab]: https://github.com/rust-lang/rust/pull/28339
9932 [stat]: https://github.com/rust-lang/rust/pull/28321
9933 [vd]: https://github.com/rust-lang/rust/pull/28494
9935 Version 1.3.0 (2015-09-17)
9936 ==============================
9938 * ~900 changes, numerous bugfixes
9943 * The [new object lifetime defaults][nold] have been [turned
9944 on][nold2] after a cycle of warnings about the change. Now types
9945 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9946 being interpreted as `&'a Box<Trait+'a>` to `&'a
9947 Box<Trait+'static>`.
9948 * [The Rustonomicon][nom] is a new book in the official documentation
9949 that dives into writing unsafe Rust.
9950 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9951 timekeeping is employed by other std APIs, as well as out-of-tree
9957 * The [new object lifetime defaults][nold] have been [turned
9958 on][nold2] after a cycle of warnings about the change.
9959 * There is a known [regression][lr] in how object lifetime elision is
9960 interpreted, the proper solution for which is undetermined.
9961 * The `#[prelude_import]` attribute, an internal implementation
9962 detail, was accidentally stabilized previously. [It has been put
9963 behind the `prelude_import` feature gate][pi]. This change is
9964 believed to break no existing code.
9965 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9966 [more sane for dynamically sized types][dst3]. Code that relied on
9967 the previous behavior is thought to be broken.
9968 * The `dropck` rules, which checks that destructors can't access
9969 destroyed values, [have been updated][dropck] to match the
9970 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9971 cause some previously-compiling code to no longer build.
9976 * The [new object lifetime defaults][nold] have been [turned
9977 on][nold2] after a cycle of warnings about the change.
9978 * Semicolons may [now follow types and paths in
9979 macros](https://github.com/rust-lang/rust/pull/27000).
9980 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9981 [more sane for dynamically sized types][dst3]. Code that relied on
9982 the previous behavior is not known to exist, and suspected to be
9984 * `'static` variables [may now be recursive][st].
9985 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9986 implementations correctly.
9987 * The `dropck` rules, which checks that destructors can't access
9988 destroyed values, [have been updated][dropck] to match the
9994 * The [`Duration`] API, [has been stabilized][ds], as well as the
9995 `std::time` module, which presently contains only `Duration`.
9996 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9997 * The owned C string, [`CString`], implements [`Borrow`] and the
9998 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9999 these allow C strings to be borrowed and cloned in generic code.
10000 * [`CStr`] implements [`Debug`].
10001 * [`AtomicPtr`] implements [`Debug`].
10002 * [`Error`] trait objects [can be downcast to their concrete types][e]
10003 in many common configurations, using the [`is`], [`downcast`],
10004 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
10006 * Searching for substrings now [employs the two-way algorithm][search]
10007 instead of doing a naive search. This gives major speedups to a
10008 number of methods, including [`contains`][sc], [`find`][sf],
10009 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
10010 [`ends_with`][sew] are also faster.
10011 * The performance of `PartialEq` for slices is [much faster][ps].
10012 * The [`Hash`] trait offers the default method, [`hash_slice`], which
10013 is overridden and optimized by the implementations for scalars.
10014 * The [`Hasher`] trait now has a number of specialized `write_*`
10015 methods for primitive types, for efficiency.
10016 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
10017 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
10018 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
10019 of [`std::error::Error::cause`][iec] also delegates to the inner
10021 * [`process::Child`][pc] gained the [`id`] method, which returns a
10022 `u32` representing the platform-specific process identifier.
10023 * The [`connect`] method on slices is deprecated, replaced by the new
10024 [`join`] method (note that both of these are on the *unstable*
10025 [`SliceConcatExt`] trait, but through the magic of the prelude are
10026 available to stable code anyway).
10027 * The [`Div`] operator is implemented for [`Wrapping`] types.
10028 * [`DerefMut` is implemented for `String`][dms].
10029 * Performance of SipHash (the default hasher for `HashMap`) is
10030 [better for long data][sh].
10031 * [`AtomicPtr`] implements [`Send`].
10032 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
10033 are now [specialized to use uninitialized buffers for increased
10035 * Lifetime parameters of foreign functions [are now resolved
10041 * Rust can now, with some coercion, [produce programs that run on
10042 Windows XP][xp], though XP is not considered a supported platform.
10043 * Porting Rust on Windows from the GNU toolchain to MSVC continues
10044 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
10045 recommended for use in 1.3, though should be fully-functional
10046 in the [64-bit 1.4 beta][b14].
10047 * On Fedora-based systems installation will [properly configure the
10048 dynamic linker][fl].
10049 * The compiler gained many new extended error descriptions, which can
10050 be accessed with the `--explain` flag.
10051 * The `dropck` pass, which checks that destructors can't access
10052 destroyed values, [has been rewritten][27261]. This fixes some
10053 soundness holes, and as such will cause some previously-compiling
10054 code to no longer build.
10055 * `rustc` now uses [LLVM to write archive files where possible][ar].
10056 Eventually this will eliminate the compiler's dependency on the ar
10058 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
10059 supported FreeBSD on x86_64).
10060 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
10061 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
10063 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
10064 will kill the process instead of leaking][nlp].
10066 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
10067 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
10068 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
10069 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
10070 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
10071 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10072 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10073 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
10074 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
10075 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
10076 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
10077 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
10078 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
10079 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
10080 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
10081 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
10082 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
10083 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
10084 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10085 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
10086 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
10087 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
10088 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
10089 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
10090 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
10091 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
10092 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
10093 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
10094 [ar]: https://github.com/rust-lang/rust/pull/26926
10095 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
10096 [dms]: https://github.com/rust-lang/rust/pull/26241
10097 [27261]: https://github.com/rust-lang/rust/pull/27261
10098 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10099 [ds]: https://github.com/rust-lang/rust/pull/26818
10100 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
10101 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
10102 [dst3]: https://github.com/rust-lang/rust/pull/27351
10103 [e]: https://github.com/rust-lang/rust/pull/24793
10104 [f]: https://github.com/rust-lang/rust/pull/26588
10105 [26959]: https://github.com/rust-lang/rust/pull/26959
10106 [fl]: https://github.com/rust-lang/rust-installer/pull/41
10107 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
10108 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
10109 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
10110 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
10111 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
10112 [lic]: https://github.com/rust-lang/rust/pull/26583
10113 [lnu]: https://github.com/rust-lang/rust/pull/27026
10114 [lr]: https://github.com/rust-lang/rust/issues/27248
10115 [lum]: https://github.com/rust-lang/rust/pull/26378
10116 [lur]: https://github.com/rust-lang/rust/pull/26783
10117 [nlp]: https://github.com/rust-lang/rust/pull/27176
10118 [nold2]: https://github.com/rust-lang/rust/pull/27045
10119 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
10120 [nom]: http://doc.rust-lang.org/nightly/nomicon/
10121 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
10122 [pi]: https://github.com/rust-lang/rust/pull/26699
10123 [ps]: https://github.com/rust-lang/rust/pull/26884
10124 [rte]: https://github.com/rust-lang/rust/pull/26950
10125 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
10126 [search]: https://github.com/rust-lang/rust/pull/26327
10127 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
10128 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
10129 [sh]: https://github.com/rust-lang/rust/pull/27280
10130 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
10131 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
10132 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
10133 [st]: https://github.com/rust-lang/rust/pull/26630
10134 [win1]: https://github.com/rust-lang/rust/pull/26569
10135 [win2]: https://github.com/rust-lang/rust/pull/26741
10136 [win3]: https://github.com/rust-lang/rust/pull/26741
10137 [win4]: https://github.com/rust-lang/rust/pull/27210
10138 [xp]: https://github.com/rust-lang/rust/pull/26569
10140 Version 1.2.0 (2015-08-07)
10141 ==========================
10143 * ~1200 changes, numerous bugfixes
10148 * [Dynamically-sized-type coercions][dst] allow smart pointer types
10149 like `Rc` to contain types without a fixed size, arrays and trait
10150 objects, finally enabling use of `Rc<[T]>` and completing the
10151 implementation of DST.
10152 * [Parallel codegen][parcodegen] is now working again, which can
10153 substantially speed up large builds in debug mode; It also gets
10154 another ~33% speedup when bootstrapping on a 4 core machine (using 8
10155 jobs). It's not enabled by default, but will be "in the near
10156 future". It can be activated with the `-C codegen-units=N` flag to
10158 * This is the first release with [experimental support for linking
10159 with the MSVC linker and lib C on Windows (instead of using the GNU
10160 variants via MinGW)][win]. It is yet recommended only for the most
10161 intrepid Rustaceans.
10162 * Benchmark compilations are showing a 30% improvement in
10163 bootstrapping over 1.1.
10168 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
10169 unicode case mapping, which is a previously-planned change in
10170 behavior and considered a bugfix.
10171 * [`mem::align_of`] now specifies [the *minimum alignment* for
10172 T][align], which is usually the alignment programs are interested
10173 in, and the same value reported by clang's
10174 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
10176 * [The `#[packed]` attribute is no longer silently accepted by the
10177 compiler][packed]. This attribute did nothing and code that
10178 mentioned it likely did not work as intended.
10179 * Associated type defaults are [now behind the
10180 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
10181 defaults *did not work*, but could be mentioned syntactically. As
10182 such this breakage has minimal impact.
10187 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
10188 matching against dereferenceable values.
10193 * The [`Extend`] trait, which grows a collection from an iterator, is
10194 implemented over iterators of references, for `String`, `Vec`,
10195 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
10196 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
10197 * The [`iter::once`] function returns an iterator that yields a single
10198 element, and [`iter::empty`] returns an iterator that yields no
10200 * The [`matches`] and [`rmatches`] methods on `str` return iterators
10201 over substring matches.
10202 * [`Cell`] and [`RefCell`] both implement `Eq`.
10203 * A number of methods for wrapping arithmetic are added to the
10204 integral types, [`wrapping_div`], [`wrapping_rem`],
10205 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10206 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10207 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10208 type.. It is illegal for the default arithmetic operations in Rust
10209 to overflow; the desire to wrap must be explicit.
10210 * The `{:#?}` formatting specifier [displays the alternate,
10211 pretty-printed][debugfmt] form of the `Debug` formatter. This
10212 feature was actually introduced prior to 1.0 with little
10214 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10215 for writing data to formatted strings, similar to [`io::Write`].
10216 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10217 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10218 are used by code generators to emit implementations of [`Debug`].
10219 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10220 methods that convert case, following Unicode case mapping.
10221 * It is now easier to handle poisoned locks. The [`PoisonError`]
10222 type, returned by failing lock operations, exposes `into_inner`,
10223 `get_ref`, and `get_mut`, which all give access to the inner lock
10224 guard, and allow the poisoned lock to continue to operate. The
10225 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10226 poisoned lock without attempting to take the lock.
10227 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10228 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10229 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10230 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10232 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10238 * `rustc` employs smarter heuristics for guessing at [typos].
10239 * `rustc` emits more efficient code for [no-op conversions between
10240 unsafe pointers][nop].
10241 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10242 resulting in faster compile times and smaller code.
10244 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10245 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10246 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10247 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10248 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10249 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10250 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10251 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10252 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10253 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10254 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10255 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10256 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10257 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10258 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10259 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10260 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10261 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10262 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10263 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10264 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10265 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10266 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10267 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10268 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10269 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10270 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10271 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10272 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10273 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10274 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10275 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10276 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10277 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10278 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10279 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10280 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10281 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10282 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10283 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10284 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10285 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10286 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10287 [align]: https://github.com/rust-lang/rust/pull/25646
10288 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10289 [typos]: https://github.com/rust-lang/rust/pull/26087
10290 [nop]: https://github.com/rust-lang/rust/pull/26336
10291 [fat]: https://github.com/rust-lang/rust/pull/26411
10292 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10293 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10294 [packed]: https://github.com/rust-lang/rust/pull/25541
10295 [ad]: https://github.com/rust-lang/rust/pull/27382
10296 [win]: https://github.com/rust-lang/rust/pull/25350
10298 Version 1.1.0 (2015-06-25)
10299 =========================
10301 * ~850 changes, numerous bugfixes
10306 * The [`std::fs` module has been expanded][fs] to expand the set of
10307 functionality exposed:
10308 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10309 don't incur a syscall on some platforms.
10310 * A `symlink_metadata` function has been added.
10311 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10312 access to all underlying information.
10313 * The compiler now contains extended explanations of many errors. When an error
10314 with an explanation occurs the compiler suggests using the `--explain` flag
10315 to read the explanation. Error explanations are also [available online][err-index].
10316 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10317 well as other work, the time to bootstrap the compiler decreased by
10323 * The [`str::split_whitespace`] method splits a string on unicode
10324 whitespace boundaries.
10325 * On both Windows and Unix, new extension traits provide conversion of
10326 I/O types to and from the underlying system handles. On Unix, these
10327 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10328 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10329 `TcpListener`, and `UpdSocket`. Further implementations for
10330 `std::process` will be stabilized later.
10331 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10332 Windows, symlinks can be created with
10333 `std::os::windows::symlink_dir` and
10334 `std::os::windows::symlink_file`.
10335 * The `mpsc::Receiver` type can now be converted into an iterator with
10336 `into_iter` on the [`IntoIterator`] trait.
10337 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10338 implementation of the [`From`] trait.
10339 * The `Debug` implementation for `RangeFull` [creates output that is
10340 more consistent with other implementations][rf].
10341 * [`Debug` is implemented for `File`][file].
10342 * The `Default` implementation for `Arc` [no longer requires `Sync +
10344 * [The `Iterator` methods `count`, `nth`, and `last` have been
10345 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10346 * Incorrect handling of paths on Windows has been improved in both the
10347 compiler and the standard library.
10348 * [`AtomicPtr` gained a `Default` implementation][ap].
10349 * In accordance with Rust's policy on arithmetic overflow `abs` now
10350 [panics on overflow when debug assertions are enabled][abs].
10351 * The [`Cloned`] iterator, which was accidentally left unstable for
10352 1.0 [has been stabilized][c].
10353 * The [`Incoming`] iterator, which iterates over incoming TCP
10354 connections, and which was accidentally unnamable in 1.0, [is now
10355 properly exported][inc].
10356 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10357 `sift_up` or `sift_down` panic][bh].
10358 * The [`split_off`] method of `LinkedList` [no longer corrupts
10359 the list in certain scenarios][ll].
10364 * Type checking performance [has improved notably][sk] with
10365 [multiple improvements][pre].
10366 * The compiler [suggests code changes][ch] for more errors.
10367 * rustc and it's build system have experimental support for [building
10368 toolchains against MUSL][m] instead of glibc on Linux.
10369 * The compiler defines the `target_env` cfg value, which is used for
10370 distinguishing toolchains that are otherwise for the same
10371 platform. Presently this is set to `gnu` for common GNU Linux
10372 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10373 * The [`cargo rustc`][crc] command invokes a build with custom flags
10375 * [Android executables are always position independent][pie].
10376 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10377 with `Drop`][24935].
10379 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10380 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10381 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10382 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10383 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10384 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10385 [rf]: https://github.com/rust-lang/rust/pull/24491
10386 [err-index]: https://doc.rust-lang.org/error-index.html
10387 [sk]: https://github.com/rust-lang/rust/pull/24615
10388 [pre]: https://github.com/rust-lang/rust/pull/25323
10389 [file]: https://github.com/rust-lang/rust/pull/24598
10390 [ch]: https://github.com/rust-lang/rust/pull/24683
10391 [arc]: https://github.com/rust-lang/rust/pull/24695
10392 [si]: https://github.com/rust-lang/rust/pull/24701
10393 [ap]: https://github.com/rust-lang/rust/pull/24834
10394 [m]: https://github.com/rust-lang/rust/pull/24777
10395 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10396 [crc]: https://github.com/rust-lang/cargo/pull/1568
10397 [pie]: https://github.com/rust-lang/rust/pull/24953
10398 [abs]: https://github.com/rust-lang/rust/pull/25441
10399 [c]: https://github.com/rust-lang/rust/pull/25496
10400 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10401 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10402 [inc]: https://github.com/rust-lang/rust/pull/25522
10403 [bh]: https://github.com/rust-lang/rust/pull/25856
10404 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10405 [ll]: https://github.com/rust-lang/rust/pull/26022
10406 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10407 [24935]: https://github.com/rust-lang/rust/pull/24935
10409 Version 1.0.0 (2015-05-15)
10410 ========================
10412 * ~1500 changes, numerous bugfixes
10417 * The vast majority of the standard library is now `#[stable]`. It is
10418 no longer possible to use unstable features with a stable build of
10420 * Many popular crates on [crates.io] now work on the stable release
10422 * Arithmetic on basic integer types now [checks for overflow in debug
10428 * Several [restrictions have been added to trait coherence][coh] in
10429 order to make it easier for upstream authors to change traits
10430 without breaking downstream code.
10431 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10432 improve error messages and macro behavior. For example, `0b1234` is
10433 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10434 * Trait bounds [are always invariant][inv], eliminating the need for
10435 the `PhantomFn` and `MarkerTrait` lang items, which have been
10437 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10438 "foo" as bar` syntax has been replaced with `extern crate foo as
10439 bar`, and Cargo now automatically translates "-" in *package* names
10440 to underscore for the crate name.
10441 * [Lifetime shadowing is an error][lt].
10442 * [`Send` no longer implies `'static`][send-rfc].
10443 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10444 `MyType::default()`.
10445 * Primitive types [now have inherent methods][prim-inherent],
10446 obviating the need for extension traits like `SliceExt`.
10447 * Methods with `Self: Sized` in their `where` clause are [considered
10448 object-safe][self-sized], allowing many extension traits like
10449 `IteratorExt` to be merged into the traits they extended.
10450 * You can now [refer to associated types][assoc-where] whose
10451 corresponding trait bounds appear only in a `where` clause.
10452 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10453 like `Send` and `Sync` are now library-defined.
10454 * A [Reflect trait][reflect] was introduced, which means that
10455 downcasting via the `Any` trait is effectively limited to concrete
10456 types. This helps retain the potentially-important "parametricity"
10457 property: generic code cannot behave differently for different type
10458 arguments except in minor ways.
10459 * The `unsafe_destructor` feature is now deprecated in favor of the
10460 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10466 * The `thread_local` module [has been renamed to `std::thread`][th].
10467 * The methods of `IteratorExt` [have been moved to the `Iterator`
10468 trait itself][23300].
10469 * Several traits that implement Rust's conventions for type
10470 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10471 [centralized in the `std::convert` module][con].
10472 * The `FromError` trait [was removed in favor of `From`][fe].
10473 * The basic sleep function [has moved to
10474 `std::thread::sleep_ms`][slp].
10475 * The `splitn` function now takes an `n` parameter that represents the
10476 number of items yielded by the returned iterator [instead of the
10477 number of 'splits'][spl].
10478 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10479 * [Derived implementations of `PartialOrd` now order enums according
10480 to their explicitly-assigned discriminants][po].
10481 * [Methods for searching strings are generic over `Pattern`s][pat],
10482 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10484 * [In method resolution, object methods are resolved before inherent
10486 * [`String::from_str` has been deprecated in favor of the `From` impl,
10487 `String::from`][24517].
10488 * [`io::Error` implements `Sync`][ios].
10489 * [The `words` method on `&str` has been replaced with
10490 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10492 * The new path and IO modules are complete and `#[stable]`. This
10493 was the major library focus for this cycle.
10494 * The path API was [revised][path-normalize] to normalize `.`,
10495 adjusting the tradeoffs in favor of the most common usage.
10496 * A large number of remaining APIs in `std` were also stabilized
10497 during this cycle; about 75% of the non-deprecated API surface
10499 * The new [string pattern API][string-pattern] landed, which makes
10500 the string slice API much more internally consistent and flexible.
10501 * A new set of [generic conversion traits][conversion] replaced
10502 many existing ad hoc traits.
10503 * Generic numeric traits were [completely removed][num-traits]. This
10504 was made possible thanks to inherent methods for primitive types,
10505 and the removal gives maximal flexibility for designing a numeric
10506 hierarchy in the future.
10507 * The `Fn` traits are now related via [inheritance][fn-inherit]
10508 and provide ergonomic [blanket implementations][fn-blanket].
10509 * The `Index` and `IndexMut` traits were changed to
10510 [take the index by value][index-value], enabling code like
10511 `hash_map["string"]` to work.
10512 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10513 `Copy` data is known to be `Clone` as well.
10518 * Many errors now have extended explanations that can be accessed with
10519 the `--explain` flag to `rustc`.
10520 * Many new examples have been added to the standard library
10522 * rustdoc has received a number of improvements focused on completion
10524 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10525 * Much headway was made on ecosystem-wide CI, making it possible
10526 to [compare builds for breakage][ci-compare].
10529 [crates.io]: http://crates.io
10530 [clo]: https://github.com/rust-lang/rust/pull/24034
10531 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10532 [con]: https://github.com/rust-lang/rust/pull/23875
10533 [cr]: https://github.com/rust-lang/rust/pull/23419
10534 [fe]: https://github.com/rust-lang/rust/pull/23879
10535 [23300]: https://github.com/rust-lang/rust/pull/23300
10536 [inv]: https://github.com/rust-lang/rust/pull/23938
10537 [ios]: https://github.com/rust-lang/rust/pull/24133
10538 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10539 [lt]: https://github.com/rust-lang/rust/pull/24057
10540 [meth]: https://github.com/rust-lang/rust/pull/24056
10541 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10542 [po]: https://github.com/rust-lang/rust/pull/24270
10543 [24517]: https://github.com/rust-lang/rust/pull/24517
10544 [slp]: https://github.com/rust-lang/rust/pull/23949
10545 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10546 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10547 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10548 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10549 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10550 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10551 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10552 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10553 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10554 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10555 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10556 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10557 [reflect]: https://github.com/rust-lang/rust/pull/23712
10558 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10559 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10560 [index-value]: https://github.com/rust-lang/rust/pull/23601
10561 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10562 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10563 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10564 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10565 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10566 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10569 Version 1.0.0-alpha.2 (2015-02-20)
10570 =====================================
10572 * ~1300 changes, numerous bugfixes
10576 * The various I/O modules were [overhauled][io-rfc] to reduce
10577 unnecessary abstractions and provide better interoperation with
10578 the underlying platform. The old `io` module remains temporarily
10580 * The standard library now [participates in feature gating][feat],
10581 so use of unstable libraries now requires a `#![feature(...)]`
10582 attribute. The impact of this change is [described on the
10583 forum][feat-forum]. [RFC][feat-rfc].
10587 * `for` loops [now operate on the `IntoIterator` trait][into],
10588 which eliminates the need to call `.iter()`, etc. to iterate
10589 over collections. There are some new subtleties to remember
10590 though regarding what sort of iterators various types yield, in
10591 particular that `for foo in bar { }` yields values from a move
10592 iterator, destroying the original collection. [RFC][into-rfc].
10593 * Objects now have [default lifetime bounds][obj], so you don't
10594 have to write `Box<Trait+'static>` when you don't care about
10595 storing references. [RFC][obj-rfc].
10596 * In types that implement `Drop`, [lifetimes must outlive the
10597 value][drop]. This will soon make it possible to safely
10598 implement `Drop` for types where `#[unsafe_destructor]` is now
10599 required. Read the [gorgeous RFC][drop-rfc] for details.
10600 * The fully qualified <T as Trait>::X syntax lets you set the Self
10601 type for a trait method or associated type. [RFC][ufcs-rfc].
10602 * References to types that implement `Deref<U>` now [automatically
10603 coerce to references][deref] to the dereferenced type `U`,
10604 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10605 should eliminate many unsightly uses of `&*`, as when converting
10606 from references to vectors into references to
10607 slices. [RFC][deref-rfc].
10608 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10609 `|:|`) is obsolete and closure kind is inferred from context.
10610 * [`Self` is a keyword][Self].
10614 * The `Show` and `String` formatting traits [have been
10615 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10616 their related purposes. Automatically getting a string
10617 conversion to use with `format!("{:?}", something_to_debug)` is
10618 now written `#[derive(Debug)]`.
10619 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10620 OsStr}`, provide strings in platform-specific encodings for easier
10621 interop with system APIs. [RFC][osstr-rfc].
10622 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10623 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10624 creating raw pointers.
10628 * Certain long error messages of the form 'expected foo found bar'
10629 are now [split neatly across multiple
10630 lines][multiline]. Examples in the PR.
10631 * On Unix Rust can be [uninstalled][un] by running
10632 `/usr/local/lib/rustlib/uninstall.sh`.
10633 * The `#[rustc_on_unimplemented]` attribute, requiring the
10634 'on_unimplemented' feature, lets rustc [display custom error
10635 messages when a trait is expected to be implemented for a type
10640 * Rust is tested against a [LALR grammar][lalr], which parses
10641 almost all the Rust files that rustc does.
10643 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10644 [close]: https://github.com/rust-lang/rust/pull/21843
10645 [deref]: https://github.com/rust-lang/rust/pull/21351
10646 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10647 [drop]: https://github.com/rust-lang/rust/pull/21972
10648 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10649 [feat]: https://github.com/rust-lang/rust/pull/21248
10650 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10651 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10652 [fmt]: https://github.com/rust-lang/rust/pull/21457
10653 [into]: https://github.com/rust-lang/rust/pull/20790
10654 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10655 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10656 [lalr]: https://github.com/rust-lang/rust/pull/21452
10657 [multiline]: https://github.com/rust-lang/rust/pull/19870
10658 [obj]: https://github.com/rust-lang/rust/pull/22230
10659 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10660 [onun]: https://github.com/rust-lang/rust/pull/20889
10661 [osstr]: https://github.com/rust-lang/rust/pull/21488
10662 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10663 [Self]: https://github.com/rust-lang/rust/pull/22158
10664 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10665 [un]: https://github.com/rust-lang/rust/pull/22256
10668 Version 1.0.0-alpha (2015-01-09)
10669 ==================================
10671 * ~2400 changes, numerous bugfixes
10675 * The language itself is considered feature complete for 1.0,
10676 though there will be many usability improvements and bugfixes
10677 before the final release.
10678 * Nearly 50% of the public API surface of the standard library has
10679 been declared 'stable'. Those interfaces are unlikely to change
10681 * The long-running debate over integer types has been
10682 [settled][ints]: Rust will ship with types named `isize` and
10683 `usize`, rather than `int` and `uint`, for pointer-sized
10684 integers. Guidelines will be rolled out during the alpha cycle.
10685 * Most crates that are not `std` have been moved out of the Rust
10686 distribution into the Cargo ecosystem so they can evolve
10687 separately and don't need to be stabilized as quickly, including
10688 'time', 'getopts', 'num', 'regex', and 'term'.
10689 * Documentation continues to be expanded with more API coverage, more
10690 examples, and more in-depth explanations. The guides have been
10691 consolidated into [The Rust Programming Language][trpl].
10692 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10693 * All official Rust binary installers now come with [Cargo], the
10694 Rust package manager.
10698 * Closures have been [completely redesigned][unboxed] to be
10699 implemented in terms of traits, can now be used as generic type
10700 bounds and thus monomorphized and inlined, or via an opaque
10701 pointer (boxed) as in the old system. The new system is often
10702 referred to as 'unboxed' closures.
10703 * Traits now support [associated types][assoc], allowing families
10704 of related types to be defined together and used generically in
10706 * Enum variants are [namespaced by their type names][enum].
10707 * [`where` clauses][where] provide a more versatile and attractive
10708 syntax for specifying generic bounds, though the previous syntax
10710 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10712 * Rust [no longer has a runtime][rt] of any description, and only
10713 supports OS threads, not green threads.
10714 * At long last, Rust has been overhauled for 'dynamically-sized
10715 types' ([DST]), which integrates 'fat pointers' (object types,
10716 arrays, and `str`) more deeply into the type system, making it
10718 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10719 `..j` that produce range types and which, when combined with the
10720 `Index` operator and multidispatch, leads to a convenient slice
10721 notation, `[i..j]`.
10722 * The new range syntax revealed an ambiguity in the fixed-length
10723 array syntax, so now fixed length arrays [are written `[T;
10725 * The `Copy` trait is no longer implemented automatically. Unsafe
10726 pointers no longer implement `Sync` and `Send` so types
10727 containing them don't automatically either. `Sync` and `Send`
10728 are now 'unsafe traits' so one can "forcibly" implement them via
10729 `unsafe impl` if a type confirms to the requirements for them
10730 even though the internals do not (e.g. structs containing unsafe
10731 pointers like `Arc`). These changes are intended to prevent some
10732 footguns and are collectively known as [opt-in built-in
10733 traits][oibit] (though `Sync` and `Send` will soon become pure
10734 library types unknown to the compiler).
10735 * Operator traits now take their operands [by value][ops], and
10736 comparison traits can use multidispatch to compare one type
10737 against multiple other types, allowing e.g. `String` to be
10738 compared with `&str`.
10739 * `if let` and `while let` are no longer feature-gated.
10740 * Rust has adopted a more [uniform syntax for escaping unicode
10741 characters][unicode].
10742 * `macro_rules!` [has been declared stable][mac]. Though it is a
10743 flawed system it is sufficiently popular that it must be usable
10744 for 1.0. Effort has gone into [future-proofing][mac-future] it
10745 in ways that will allow other macro systems to be developed in
10746 parallel, and won't otherwise impact the evolution of the
10748 * The prelude has been [pared back significantly][prelude] such
10749 that it is the minimum necessary to support the most pervasive
10750 code patterns, and through [generalized where clauses][where]
10751 many of the prelude extension traits have been consolidated.
10752 * Rust's rudimentary reflection [has been removed][refl], as it
10753 incurred too much code generation for little benefit.
10754 * [Struct variants][structvars] are no longer feature-gated.
10755 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10756 known as 'higher-ranked trait bounds', this crucially allows
10757 unboxed closures to work.
10758 * Macros invocations surrounded by parens or square brackets and
10759 not terminated by a semicolon are [parsed as
10760 expressions][macros], which makes expressions like `vec![1i32,
10761 2, 3].len()` work as expected.
10762 * Trait objects now implement their traits automatically, and
10763 traits that can be coerced to objects now must be [object
10765 * Automatically deriving traits is now done with `#[derive(...)]`
10766 not `#[deriving(...)]` for [consistency with other naming
10767 conventions][derive].
10768 * Importing the containing module or enum at the same time as
10769 items or variants they contain is [now done with `self` instead
10770 of `mod`][self], as in use `foo::{self, bar}`
10771 * Glob imports are no longer feature-gated.
10772 * The `box` operator and `box` patterns have been feature-gated
10773 pending a redesign. For now unique boxes should be allocated
10774 like other containers, with `Box::new`.
10778 * A [series][coll1] of [efforts][coll2] to establish
10779 [conventions][coll3] for collections types has resulted in API
10780 improvements throughout the standard library.
10781 * New [APIs for error handling][err] provide ergonomic interop
10782 between error types, and [new conventions][err-conv] describe
10783 more clearly the recommended error handling strategies in Rust.
10784 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10785 it is easier to discuss failure in the context of error handling
10786 without making clarifications as to whether you are referring to
10787 the 'fail' macro or failure more generally.
10788 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10789 syscall when available.
10790 * The 'serialize' crate has been renamed 'rustc-serialize' and
10791 moved out of the distribution to Cargo. Although it is widely
10792 used now, it is expected to be superseded in the near future.
10793 * The `Show` formatter, typically implemented with
10794 `#[derive(Show)]` is [now requested with the `{:?}`
10795 specifier][show] and is intended for use by all types, for uses
10796 such as `println!` debugging. The new `String` formatter must be
10797 implemented by hand, uses the `{}` specifier, and is intended
10798 for full-fidelity conversions of things that can logically be
10799 represented as strings.
10803 * [Flexible target specification][flex] allows rustc's code
10804 generation to be configured to support otherwise-unsupported
10806 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10807 respective debuggers with Rust-appropriate pretty-printing.
10808 * The Windows installation of Rust is distributed with the
10809 MinGW components currently required to link binaries on that
10814 * Nullable enum optimizations have been extended to more types so
10815 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10816 space than the inner types themselves.
10817 * Work has begun on supporting AArch64.
10819 [Cargo]: https://crates.io
10820 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10821 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10822 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10823 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10824 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10825 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10826 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10827 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10828 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10829 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10830 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10831 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10832 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10833 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10834 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10835 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10836 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10837 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10838 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10839 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10840 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10841 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10842 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10843 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10844 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10845 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10846 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10847 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10848 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10849 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10850 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10851 [trpl]: https://doc.rust-lang.org/book/index.html
10852 [rbe]: http://rustbyexample.com/
10855 Version 0.12.0 (2014-10-09)
10856 =============================
10858 * ~1900 changes, numerous bugfixes
10862 * The introductory documentation (now called The Rust Guide) has
10863 been completely rewritten, as have a number of supplementary
10865 * Rust's package manager, Cargo, continues to improve and is
10866 sometimes considered to be quite awesome.
10867 * Many API's in `std` have been reviewed and updated for
10868 consistency with the in-development Rust coding
10869 guidelines. The standard library documentation tracks
10870 stabilization progress.
10871 * Minor libraries have been moved out-of-tree to the rust-lang org
10872 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10873 be installed with Cargo.
10874 * Lifetime elision allows lifetime annotations to be left off of
10875 function declarations in many common scenarios.
10876 * Rust now works on 64-bit Windows.
10879 * Indexing can be overloaded with the `Index` and `IndexMut`
10881 * The `if let` construct takes a branch only if the `let` pattern
10882 matches, currently behind the 'if_let' feature gate.
10883 * 'where clauses', a more flexible syntax for specifying trait
10884 bounds that is more aesthetic, have been added for traits and
10885 free functions. Where clauses will in the future make it
10886 possible to constrain associated types, which would be
10887 impossible with the existing syntax.
10888 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10889 the 'slicing_syntax' feature gate, and can be overloaded with
10890 the `Slice` or `SliceMut` traits.
10891 * The syntax for matching of sub-slices has been changed to use a
10892 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10893 consistency with other uses of `..` and to future-proof
10894 potential additional uses of the syntax.
10895 * The syntax for matching inclusive ranges in patterns has changed
10896 from `0..3` to `0...4` to be consistent with the exclusive range
10897 syntax for slicing.
10898 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10899 c]`) has been put behind the 'advanced_slice_patterns' feature
10900 gate and may be removed in the future.
10901 * Components of tuples and tuple structs can be extracted using
10902 the `value.0` syntax, currently behind the `tuple_indexing`
10904 * The `#[crate_id]` attribute is no longer supported; versioning
10905 is handled by the package manager.
10906 * Renaming crate imports are now written `extern crate foo as bar`
10907 instead of `extern crate bar = foo`.
10908 * Renaming use statements are now written `use foo as bar` instead
10909 of `use bar = foo`.
10910 * `let` and `match` bindings and argument names in macros are now
10912 * The new, more efficient, closure types ('unboxed closures') have
10913 been added under a feature gate, 'unboxed_closures'. These will
10914 soon replace the existing closure types, once higher-ranked
10915 trait lifetimes are added to the language.
10916 * `move` has been added as a keyword, for indicating closures
10917 that capture by value.
10918 * Mutation and assignment is no longer allowed in pattern guards.
10919 * Generic structs and enums can now have trait bounds.
10920 * The `Share` trait is now called `Sync` to free up the term
10921 'shared' to refer to 'shared reference' (the default reference
10923 * Dynamically-sized types have been mostly implemented,
10924 unifying the behavior of fat-pointer types with the rest of the
10926 * As part of dynamically-sized types, the `Sized` trait has been
10927 introduced, which qualifying types implement by default, and
10928 which type parameters expect by default. To specify that a type
10929 parameter does not need to be sized, write `<Sized? T>`. Most
10930 types are `Sized`, notable exceptions being unsized arrays
10931 (`[T]`) and trait types.
10932 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10933 * Lifetime bounds can now be applied to type parameters and object
10935 * The old, reference counted GC type, `Gc<T>` which was once
10936 denoted by the `@` sigil, has finally been removed. GC will be
10937 revisited in the future.
10940 * Library documentation has been improved for a number of modules.
10941 * Bit-vectors, collections::bitv has been modernized.
10942 * The url crate is deprecated in favor of
10943 http://github.com/servo/rust-url, which can be installed with
10945 * Most I/O stream types can be cloned and subsequently closed from
10946 a different thread.
10947 * A `std::time::Duration` type has been added for use in I/O
10948 methods that rely on timers, as well as in the 'time' crate's
10949 `Timespec` arithmetic.
10950 * The runtime I/O abstraction layer that enabled the green thread
10951 scheduler to do non-thread-blocking I/O has been removed, along
10952 with the libuv-based implementation employed by the green thread
10953 scheduler. This will greatly simplify the future I/O work.
10954 * `collections::btree` has been rewritten to have a more
10955 idiomatic and efficient design.
10958 * rustdoc output now indicates the stability levels of API's.
10959 * The `--crate-name` flag can specify the name of the crate
10960 being compiled, like `#[crate_name]`.
10961 * The `-C metadata` specifies additional metadata to hash into
10962 symbol names, and `-C extra-filename` specifies additional
10963 information to put into the output filename, for use by the
10964 package manager for versioning.
10965 * debug info generation has continued to improve and should be
10966 more reliable under both gdb and lldb.
10967 * rustc has experimental support for compiling in parallel
10968 using the `-C codegen-units` flag.
10969 * rustc no longer encodes rpath information into binaries by
10973 * Stack usage has been optimized with LLVM lifetime annotations.
10974 * Official Rust binaries on Linux are more compatible with older
10975 kernels and distributions, built on CentOS 5.10.
10978 Version 0.11.0 (2014-07-02)
10979 ==========================
10981 * ~1700 changes, numerous bugfixes
10984 * ~[T] has been removed from the language. This type is superseded by
10986 * ~str has been removed from the language. This type is superseded by
10988 * ~T has been removed from the language. This type is superseded by the
10990 * @T has been removed from the language. This type is superseded by the
10991 standard library's std::gc::Gc<T> type.
10992 * Struct fields are now all private by default.
10993 * Vector indices and shift amounts are both required to be a `uint`
10994 instead of any integral type.
10995 * Byte character, byte string, and raw byte string literals are now all
10996 supported by prefixing the normal literal with a `b`.
10997 * Multiple ABIs are no longer allowed in an ABI string
10998 * The syntax for lifetimes on closures/procedures has been tweaked
10999 slightly: `<'a>|A, B|: 'b + K -> T`
11000 * Floating point modulus has been removed from the language; however it
11001 is still provided by a library implementation.
11002 * Private enum variants are now disallowed.
11003 * The `priv` keyword has been removed from the language.
11004 * A closure can no longer be invoked through a &-pointer.
11005 * The `use foo, bar, baz;` syntax has been removed from the language.
11006 * The transmute intrinsic no longer works on type parameters.
11007 * Statics now allow blocks/items in their definition.
11008 * Trait bounds are separated from objects with + instead of : now.
11009 * Objects can no longer be read while they are mutably borrowed.
11010 * The address of a static is now marked as insignificant unless the
11011 #[inline(never)] attribute is placed it.
11012 * The #[unsafe_destructor] attribute is now behind a feature gate.
11013 * Struct literals are no longer allowed in ambiguous positions such as
11014 if, while, match, and for..in.
11015 * Declaration of lang items and intrinsics are now feature-gated by
11017 * Integral literals no longer default to `int`, and floating point
11018 literals no longer default to `f64`. Literals must be suffixed with an
11019 appropriate type if inference cannot determine the type of the
11021 * The Box<T> type is no longer implicitly borrowed to &mut T.
11022 * Procedures are now required to not capture borrowed references.
11025 * The standard library is now a "facade" over a number of underlying
11026 libraries. This means that development on the standard library should
11027 be speedier due to smaller crates, as well as a clearer line between
11029 * A new library, libcore, lives under the standard library's facade
11030 which is Rust's "0-assumption" library, suitable for embedded and
11031 kernel development for example.
11032 * A regex crate has been added to the standard distribution. This crate
11033 includes statically compiled regular expressions.
11034 * The unwrap/unwrap_err methods on Result require a Show bound for
11035 better error messages.
11036 * The return types of the std::comm primitives have been centralized
11037 around the Result type.
11038 * A number of I/O primitives have gained the ability to time out their
11040 * A number of I/O primitives have gained the ability to close their
11041 reading/writing halves to cancel pending operations.
11042 * Reverse iterator methods have been removed in favor of `rev()` on
11043 their forward-iteration counterparts.
11044 * A bitflags! macro has been added to enable easy interop with C and
11045 management of bit flags.
11046 * A debug_assert! macro is now provided which is disabled when
11047 `--cfg ndebug` is passed to the compiler.
11048 * A graphviz crate has been added for creating .dot files.
11049 * The std::cast module has been migrated into std::mem.
11050 * The std::local_data api has been migrated from freestanding functions
11051 to being based on methods.
11052 * The Pod trait has been renamed to Copy.
11053 * jemalloc has been added as the default allocator for types.
11054 * The API for allocating memory has been changed to use proper alignment
11055 and sized deallocation
11056 * Connecting a TcpStream or binding a TcpListener is now based on a
11057 string address and a u16 port. This allows connecting to a hostname as
11059 * The Reader trait now contains a core method, read_at_least(), which
11060 correctly handles many repeated 0-length reads.
11061 * The process-spawning API is now centered around a builder-style
11063 * The :? printing qualifier has been moved from the standard library to
11064 an external libdebug crate.
11065 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
11066 have been renamed to Eq/Ord.
11067 * The select/plural methods have been removed from format!. The escapes
11068 for { and } have also changed from \{ and \} to {{ and }},
11070 * The TaskBuilder API has been re-worked to be a true builder, and
11071 extension traits for spawning native/green tasks have been added.
11074 * All breaking changes to the language or libraries now have their
11075 commit message annotated with `[breaking-change]` to allow for easy
11076 discovery of breaking changes.
11077 * The compiler will now try to suggest how to annotate lifetimes if a
11078 lifetime-related error occurs.
11079 * Debug info continues to be improved greatly with general bug fixes and
11080 better support for situations like link time optimization (LTO).
11081 * Usage of syntax extensions when cross-compiling has been fixed.
11082 * Functionality equivalent to GCC & Clang's -ffunction-sections,
11083 -fdata-sections and --gc-sections has been enabled by default
11084 * The compiler is now stricter about where it will load module files
11085 from when a module is declared via `mod foo;`.
11086 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
11087 Syntax extensions are now discovered via a "plugin registrar" type
11088 which will be extended in the future to other various plugins.
11089 * Lints have been restructured to allow for dynamically loadable lints.
11090 * A number of rustdoc improvements:
11091 * The HTML output has been visually redesigned.
11092 * Markdown is now powered by hoedown instead of sundown.
11093 * Searching heuristics have been greatly improved.
11094 * The search index has been reduced in size by a great amount.
11095 * Cross-crate documentation via `pub use` has been greatly improved.
11096 * Primitive types are now hyperlinked and documented.
11097 * Documentation has been moved from static.rust-lang.org/doc to
11099 * A new sandbox, play.rust-lang.org, is available for running and
11100 sharing rust code examples on-line.
11101 * Unused attributes are now more robustly warned about.
11102 * The dead_code lint now warns about unused struct fields.
11103 * Cross-compiling to iOS is now supported.
11104 * Cross-compiling to mipsel is now supported.
11105 * Stability attributes are now inherited by default and no longer apply
11106 to intra-crate usage, only inter-crate usage.
11107 * Error message related to non-exhaustive match expressions have been
11111 Version 0.10 (2014-04-03)
11112 =========================
11114 * ~1500 changes, numerous bugfixes
11117 * A new RFC process is now in place for modifying the language.
11118 * Patterns with `@`-pointers have been removed from the language.
11119 * Patterns with unique vectors (`~[T]`) have been removed from the
11121 * Patterns with unique strings (`~str`) have been removed from the
11123 * `@str` has been removed from the language.
11124 * `@[T]` has been removed from the language.
11125 * `@self` has been removed from the language.
11126 * `@Trait` has been removed from the language.
11127 * Headers on `~` allocations which contain `@` boxes inside the type for
11128 reference counting have been removed.
11129 * The semantics around the lifetimes of temporary expressions have changed,
11130 see #3511 and #11585 for more information.
11131 * Cross-crate syntax extensions are now possible, but feature gated. See
11132 #11151 for more information. This includes both `macro_rules!` macros as
11133 well as syntax extensions such as `format!`.
11134 * New lint modes have been added, and older ones have been turned on to be
11136 * Unnecessary parentheses
11137 * Uppercase statics
11139 * Uppercase variables
11140 * Publicly visible private types
11141 * `#[deriving]` with raw pointers
11142 * Unsafe functions can no longer be coerced to closures.
11143 * Various obscure macros such as `log_syntax!` are now behind feature gates.
11144 * The `#[simd]` attribute is now behind a feature gate.
11145 * Visibility is no longer allowed on `extern crate` statements, and
11146 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
11147 * Trailing commas are now allowed in argument lists and tuple patterns.
11148 * The `do` keyword has been removed, it is now a reserved keyword.
11149 * Default type parameters have been implemented, but are feature gated.
11150 * Borrowed variables through captures in closures are now considered soundly.
11151 * `extern mod` is now `extern crate`
11152 * The `Freeze` trait has been removed.
11153 * The `Share` trait has been added for types that can be shared among
11155 * Labels in macros are now hygienic.
11156 * Expression/statement macro invocations can be delimited with `{}` now.
11157 * Treatment of types allowed in `static mut` locations has been tweaked.
11158 * The `*` and `.` operators are now overloadable through the `Deref` and
11160 * `~Trait` and `proc` no longer have `Send` bounds by default.
11161 * Partial type hints are now supported with the `_` type marker.
11162 * An `Unsafe` type was introduced for interior mutability. It is now
11163 considered undefined to transmute from `&T` to `&mut T` without using the
11165 * The #[linkage] attribute was implemented for extern statics/functions.
11166 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
11167 * `Pod` was renamed to `Copy`.
11170 * The `libextra` library has been removed. It has now been decomposed into
11171 component libraries with smaller and more focused nuggets of
11172 functionality. The full list of libraries can be found on the
11173 documentation index page.
11174 * std: `std::condition` has been removed. All I/O errors are now propagated
11175 through the `Result` type. In order to assist with error handling, a
11176 `try!` macro for unwrapping errors with an early return and a lint for
11177 unused results has been added. See #12039 for more information.
11178 * std: The `vec` module has been renamed to `slice`.
11179 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
11180 This will become the only growable vector in the future.
11181 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
11182 are now found at `std::io::BufferedReader` instead of
11183 `std::io::buffered::BufferedReader`.
11184 * std: `print` and `println` are no longer in the prelude, the `print!` and
11185 `println!` macros are intended to be used instead.
11186 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
11187 attempts to statically prevent cycles.
11188 * std: The standard distribution is adopting the policy of pushing failure
11189 to the user rather than failing in libraries. Many functions (such as
11190 `slice::last()`) now return `Option<T>` instead of `T` + failing.
11191 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
11192 deriving mode: `#[deriving(Show)]`.
11193 * std: `ToStr` is now implemented for all types implementing `Show`.
11194 * std: The formatting trait methods now take `&self` instead of `&T`
11195 * std: The `invert()` method on iterators has been renamed to `rev()`
11196 * std: `std::num` has seen a reduction in the genericity of its traits,
11197 consolidating functionality into a few core traits.
11198 * std: Backtraces are now printed on task failure if the environment
11199 variable `RUST_BACKTRACE` is present.
11200 * std: Naming conventions for iterators have been standardized. More details
11201 can be found on the wiki's style guide.
11202 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11203 still implement the function.
11204 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11205 * std: `assert_approx_eq!` has been removed
11206 * std: The `e` and `E` formatting specifiers for floats have been added to
11207 print them in exponential notation.
11208 * std: The `Times` trait has been removed
11209 * std: Indications of variance and opting out of builtin bounds is done
11210 through marker types in `std::kinds::marker` now
11211 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11212 `#[deriving(Hash)]` is now possible.
11213 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11214 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11215 * std: `Chan::new` is now `channel()`.
11216 * std: A new synchronous channel type has been implemented.
11217 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11218 * std: `hashmap` and `trie` have been moved to `libcollections`
11219 * std: `run` has been rolled into `io::process`
11220 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11221 * std: The equality and comparison traits have seen some reorganization.
11222 * std: `rand` has moved to `librand`.
11223 * std: `to_{lower,upper}case` has been implemented for `char`.
11224 * std: Logging has been moved to `liblog`.
11225 * collections: `HashMap` has been rewritten for higher performance and less
11227 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11228 it can be booted manually. The runtime guide has more information and
11230 * native: All I/O functionality except signals has been implemented.
11231 * green: Task spawning with `libgreen` has been optimized with stack caching
11232 and various trimming of code.
11233 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11234 * sync: The `extra::sync` module has been updated to modern rust (and moved
11235 to the `sync` library), tweaking and improving various interfaces while
11236 dropping redundant functionality.
11237 * sync: A new `Barrier` type has been added to the `sync` library.
11238 * sync: An efficient mutex for native and green tasks has been implemented.
11239 * serialize: The `base64` module has seen some improvement. It treats
11240 newlines better, has non-string error values, and has seen general
11242 * fourcc: A `fourcc!` macro was introduced
11243 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11244 hexadecimal literal.
11247 * `rustpkg` has been deprecated and removed from the main repository. Its
11248 replacement, `cargo`, is under development.
11249 * Nightly builds of rust are now available
11250 * The memory usage of rustc has been improved many times throughout this
11252 * The build process supports disabling rpath support for the rustc binary
11254 * Code generation has improved in some cases, giving more information to the
11255 LLVM optimization passes to enable more extensive optimizations.
11256 * Debuginfo compatibility with lldb on OSX has been restored.
11257 * The master branch is now gated on an android bot, making building for
11258 android much more reliable.
11259 * Output flags have been centralized into one `--emit` flag.
11260 * Crate type flags have been centralized into one `--crate-type` flag.
11261 * Codegen flags have been consolidated behind a `-C` flag.
11262 * Linking against outdated crates now has improved error messages.
11263 * Error messages with lifetimes will often suggest how to annotate the
11264 function to fix the error.
11265 * Many more types are documented in the standard library, and new guides
11267 * Many `rustdoc` improvements:
11268 * code blocks are syntax highlighted.
11269 * render standalone markdown files.
11270 * the --test flag tests all code blocks by default.
11271 * exported macros are displayed.
11272 * re-exported types have their documentation inlined at the location of the
11274 * search works across crates that have been rendered to the same output
11278 Version 0.9 (2014-01-09)
11279 ==========================
11281 * ~1800 changes, numerous bugfixes
11284 * The `float` type has been removed. Use `f32` or `f64` instead.
11285 * A new facility for enabling experimental features (feature gating) has
11286 been added, using the crate-level `#[feature(foo)]` attribute.
11287 * Managed boxes (@) are now behind a feature gate
11288 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11289 standard library's `Gc` or `Rc` types instead.
11290 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11291 * Jumping back to the top of a loop is now done with `continue` instead of
11293 * Strings can no longer be mutated through index assignment.
11294 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11295 hash delimiters, as in `r###"foo"###`.
11296 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11298 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11299 * `@fn`s have been removed.
11300 * `do` only works with procs in order to make it obvious what the cost
11302 * Single-element tuple-like structs can no longer be dereferenced to
11303 obtain the inner value. A more comprehensive solution for overloading
11304 the dereference operator will be provided in the future.
11305 * The `#[link(...)]` attribute has been replaced with
11306 `#[crate_id = "name#vers"]`.
11307 * Empty `impl`s must be terminated with empty braces and may not be
11308 terminated with a semicolon.
11309 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11310 no longer has any special meaning.
11311 * The old `fmt!` string formatting macro has been removed.
11312 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11313 `print!` and `println!`.
11314 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11315 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11316 `extern mod foo = "bar"` instead.
11317 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11318 * Macros can have attributes.
11319 * Macros can expand to items with attributes.
11320 * Macros can expand to multiple items.
11321 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11322 * Comments may be nested.
11323 * Values automatically coerce to trait objects they implement, without
11325 * Enum discriminants are no longer an entire word but as small as needed to
11326 contain all the variants. The `repr` attribute can be used to override
11327 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11328 `#[repr(C)]` to match C enums.
11329 * Non-string literals are not allowed in attributes (they never worked).
11330 * The FFI now supports variadic functions.
11331 * Octal numeric literals, as in `0o7777`.
11332 * The `concat!` syntax extension performs compile-time string concatenation.
11333 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11334 removed as Rust no longer uses segmented stacks.
11335 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11336 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11337 not `*`; ignoring remaining fields of a struct is also done with `..`,
11338 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11339 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11340 * `rustc` supports the "system" calling convention, which defaults to the
11341 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11343 * The `type_overflow` lint (default: warn) checks literals for overflow.
11344 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11345 * The `attribute_usage` lint (default: warn) warns about unknown
11347 * The `unknown_features` lint (default: warn) warns about unknown
11349 * The `dead_code` lint (default: warn) checks for dead code.
11350 * Rust libraries can be linked statically to one another
11351 * `#[link_args]` is behind the `link_args` feature gate.
11352 * Native libraries are now linked with `#[link(name = "foo")]`
11353 * Native libraries can be statically linked to a rust crate
11354 (`#[link(name = "foo", kind = "static")]`).
11355 * Native OS X frameworks are now officially supported
11356 (`#[link(name = "foo", kind = "framework")]`).
11357 * The `#[thread_local]` attribute creates thread-local (not task-local)
11358 variables. Currently behind the `thread_local` feature gate.
11359 * The `return` keyword may be used in closures.
11360 * Types that can be copied via a memcpy implement the `Pod` kind.
11361 * The `cfg` attribute can now be used on struct fields and enum variants.
11364 * std: The `option` and `result` API's have been overhauled to make them
11365 simpler, more consistent, and more composable.
11366 * std: The entire `std::io` module has been replaced with one that is
11367 more comprehensive and that properly interfaces with the underlying
11368 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11370 * std: `io::util` contains a number of useful implementations of
11371 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11372 `ZeroReader`, `TeeReader`.
11373 * std: The reference counted pointer type `extra::rc` moved into std.
11374 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11375 just a wrapper around it).
11376 * std: The `Either` type has been removed.
11377 * std: `fmt::Default` can be implemented for any type to provide default
11378 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11379 * std: The `rand` API continues to be tweaked.
11380 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11381 on failure in gdb, is now named `rust_fail`.
11382 * std: The `each_key` and `each_value` methods on `HashMap` have been
11383 replaced by the `keys` and `values` iterators.
11384 * std: Functions dealing with type size and alignment have moved from the
11385 `sys` module to the `mem` module.
11386 * std: The `path` module was written and API changed.
11387 * std: `str::from_utf8` has been changed to cast instead of allocate.
11388 * std: `starts_with` and `ends_with` methods added to vectors via the
11389 `ImmutableEqVector` trait, which is in the prelude.
11390 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11391 if the index is out of bounds.
11392 * std: Task failure no longer propagates between tasks, as the model was
11393 complex, expensive, and incompatible with thread-based tasks.
11394 * std: The `Any` type can be used for dynamic typing.
11395 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11397 * std: Methods that produce iterators generally do not have an `_iter`
11399 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11400 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11401 * std: `util::ignore` renamed to `prelude::drop`.
11402 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11404 * std: `vec::raw` has seen a lot of cleanup and API changes.
11405 * std: The standard library no longer includes any C++ code, and very
11406 minimal C, eliminating the dependency on libstdc++.
11407 * std: Runtime scheduling and I/O functionality has been factored out into
11408 extensible interfaces and is now implemented by two different crates:
11409 libnative, for native threading and I/O; and libgreen, for green threading
11410 and I/O. This paves the way for using the standard library in more limited
11411 embedded environments.
11412 * std: The `comm` module has been rewritten to be much faster, have a
11413 simpler, more consistent API, and to work for both native and green
11415 * std: All libuv dependencies have been moved into the rustuv crate.
11416 * native: New implementations of runtime scheduling on top of OS threads.
11417 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11419 * green: The green thread scheduler and message passing types are almost
11420 entirely lock-free.
11421 * extra: The `flatpipes` module had bitrotted and was removed.
11422 * extra: All crypto functions have been removed and Rust now has a policy of
11423 not reimplementing crypto in the standard library. In the future crypto
11424 will be provided by external crates with bindings to established libraries.
11425 * extra: `c_vec` has been modernized.
11426 * extra: The `sort` module has been removed. Use the `sort` method on
11430 * The `rust` and `rusti` commands have been removed, due to lack of
11432 * `rustdoc` was completely rewritten.
11433 * `rustdoc` can test code examples in documentation.
11434 * `rustpkg` can test packages with the argument, 'test'.
11435 * `rustpkg` supports arbitrary dependencies, including C libraries.
11436 * `rustc`'s support for generating debug info is improved again.
11437 * `rustc` has better error reporting for unbalanced delimiters.
11438 * `rustc`'s JIT support was removed due to bitrot.
11439 * Executables and static libraries can be built with LTO (-Z lto)
11440 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11444 Version 0.8 (2013-09-26)
11445 ============================
11447 * ~2200 changes, numerous bugfixes
11450 * The `for` loop syntax has changed to work with the `Iterator` trait.
11451 * At long last, unwinding works on Windows.
11452 * Default methods are ready for use.
11453 * Many trait inheritance bugs fixed.
11454 * Owned and borrowed trait objects work more reliably.
11455 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11456 * rustc can omit emission of code for the `debug!` macro if it is passed
11458 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11459 for foo.rs, then foo/mod.rs, and will generate an error when both are
11461 * Strings no longer contain trailing nulls. The new `std::c_str` module
11462 provides new mechanisms for converting to C strings.
11463 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11464 * The FFI has been overhauled such that foreign functions are called directly,
11465 instead of through a stack-switching wrapper.
11466 * Calling a foreign function must be done through a Rust function with the
11467 `#[fixed_stack_segment]` attribute.
11468 * The `externfn!` macro can be used to declare both a foreign function and
11469 a `#[fixed_stack_segment]` wrapper at once.
11470 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11471 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11472 * `priv` is disallowed everywhere except for struct fields and enum variants.
11473 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11474 * `ref` bindings in irrefutable patterns work correctly now.
11475 * `char` is now prevented from containing invalid code points.
11476 * Casting to `bool` is no longer allowed.
11477 * `\0` is now accepted as an escape in chars and strings.
11478 * `yield` is a reserved keyword.
11479 * `typeof` is a reserved keyword.
11480 * Crates may be imported by URL with `extern mod foo = "url";`.
11481 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11482 * Static vectors can be initialized with repeating elements,
11483 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11484 * Static structs can be initialized with functional record update,
11485 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11486 * `cfg!` can be used to conditionally execute code based on the crate
11487 configuration, similarly to `#[cfg(...)]`.
11488 * The `unnecessary_qualification` lint detects unneeded module
11489 prefixes (default: allow).
11490 * Arithmetic operations have been implemented on the SIMD types in
11491 `std::unstable::simd`.
11492 * Exchange allocation headers were removed, reducing memory usage.
11493 * `format!` implements a completely new, extensible, and higher-performance
11494 string formatting system. It will replace `fmt!`.
11495 * `print!` and `println!` write formatted strings (using the `format!`
11496 extension) to stdout.
11497 * `write!` and `writeln!` write formatted strings (using the `format!`
11498 extension) to the new Writers in `std::rt::io`.
11499 * The library section in which a function or static is placed may
11500 be specified with `#[link_section = "..."]`.
11501 * The `proto!` syntax extension for defining bounded message protocols
11503 * `macro_rules!` is hygienic for `let` declarations.
11504 * The `#[export_name]` attribute specifies the name of a symbol.
11505 * `unreachable!` can be used to indicate unreachable code, and fails
11509 * std: Transitioned to the new runtime, written in Rust.
11510 * std: Added an experimental I/O library, `rt::io`, based on the new
11512 * std: A new generic `range` function was added to the prelude, replacing
11513 `uint::range` and friends.
11514 * std: `range_rev` no longer exists. Since range is an iterator it can be
11515 reversed with `range(lo, hi).invert()`.
11516 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11517 renamed to `unwrap_or`.
11518 * std: The `iterator` module was renamed to `iter`.
11519 * std: Integral types now support the `checked_add`, `checked_sub`, and
11520 `checked_mul` operations for detecting overflow.
11521 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11523 * std: Methods are standardizing on conventions for casting methods:
11524 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11526 * std: The `CString` type in `c_str` provides new ways to convert to and
11528 * std: `DoubleEndedIterator` can yield elements in two directions.
11529 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11531 * std: `str::from_bytes` renamed to `str::from_utf8`.
11532 * std: `pop_opt` and `shift_opt` methods added to vectors.
11533 * std: The task-local data interface no longer uses @, and keys are
11534 no longer function pointers.
11535 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11536 * std: Added `SharedPort` to `comm`.
11537 * std: `Eq` has a default method for `ne`; only `eq` is required
11538 in implementations.
11539 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11540 is required in implementations.
11541 * std: `is_utf8` performance is improved, impacting many string functions.
11542 * std: `os::MemoryMap` provides cross-platform mmap.
11543 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11544 are not 'in-bounds' are considered undefined.
11545 * std: Many freestanding functions in `vec` removed in favor of methods.
11546 * std: Many freestanding functions on scalar types removed in favor of
11548 * std: Many options to task builders were removed since they don't make
11549 sense in the new scheduler design.
11550 * std: More containers implement `FromIterator` so can be created by the
11552 * std: More complete atomic types in `unstable::atomics`.
11553 * std: `comm::PortSet` removed.
11554 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11555 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11556 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11557 default implementations.
11558 * std: Various `from_str` functions were removed in favor of a generic
11559 `from_str` which is available in the prelude.
11560 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11561 * extra: `dlist`, the doubly-linked list was modernized.
11562 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11563 * extra: Added `glob` module, replacing `std::os::glob`.
11564 * extra: `rope` was removed.
11565 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11566 * extra: `net`, and `timer` were removed. The experimental replacements
11567 are `std::rt::io::net` and `std::rt::io::timer`.
11568 * extra: Iterators implemented for `SmallIntMap`.
11569 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11570 * extra: `SmallIntSet` removed. Use `BitvSet`.
11571 * extra: Performance of JSON parsing greatly improved.
11572 * extra: `semver` updated to SemVer 2.0.0.
11573 * extra: `term` handles more terminals correctly.
11574 * extra: `dbg` module removed.
11575 * extra: `par` module removed.
11576 * extra: `future` was cleaned up, with some method renames.
11577 * extra: Most free functions in `getopts` were converted to methods.
11580 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11581 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11582 similarly to gcc's `--march` flag.
11583 * rustc's performance compiling small crates is much better.
11584 * rustpkg has received many improvements.
11585 * rustpkg supports git tags as package IDs.
11586 * rustpkg builds into target-specific directories so it can be used for
11588 * The number of concurrent test tasks is controlled by the environment
11589 variable RUST_TEST_TASKS.
11590 * The test harness can now report metrics for benchmarks.
11591 * All tools have man pages.
11592 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11593 * The runtime uses jemalloc for allocations.
11594 * Segmented stacks are temporarily disabled as part of the transition to
11595 the new runtime. Stack overflows are possible!
11596 * A new documentation backend, rustdoc_ng, is available for use. It is
11597 still invoked through the normal `rustdoc` command.
11600 Version 0.7 (2013-07-03)
11601 =======================
11603 * ~2000 changes, numerous bugfixes
11606 * `impl`s no longer accept a visibility qualifier. Put them on methods
11608 * The borrow checker has been rewritten with flow-sensitivity, fixing
11609 many bugs and inconveniences.
11610 * The `self` parameter no longer implicitly means `&'self self`,
11611 and can be explicitly marked with a lifetime.
11612 * Overloadable compound operators (`+=`, etc.) have been temporarily
11613 removed due to bugs.
11614 * The `for` loop protocol now requires `for`-iterators to return `bool`
11615 so they compose better.
11616 * The `Durable` trait is replaced with the `'static` bounds.
11617 * Trait default methods work more often.
11618 * Structs with the `#[packed]` attribute have byte alignment and
11619 no padding between fields.
11620 * Type parameters bound by `Copy` must now be copied explicitly with
11621 the `copy` keyword.
11622 * It is now illegal to move out of a dereferenced unsafe pointer.
11623 * `Option<~T>` is now represented as a nullable pointer.
11624 * `@mut` does dynamic borrow checks correctly.
11625 * The `main` function is only detected at the topmost level of the crate.
11626 The `#[main]` attribute is still valid anywhere.
11627 * Struct fields may no longer be mutable. Use inherited mutability.
11628 * The `#[no_send]` attribute makes a type that would otherwise be
11630 * The `#[no_freeze]` attribute makes a type that would otherwise be
11632 * Unbounded recursion will abort the process after reaching the limit
11633 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11634 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11635 are never implicitly copyable.
11636 * `#[static_assert]` makes compile-time assertions about static bools.
11637 * At long last, 'argument modes' no longer exist.
11638 * The rarely used `use mod` statement no longer exists.
11640 * Syntax extensions
11641 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11643 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11644 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11645 `#[deriving(...)]`.
11646 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11647 and unsuffixed integer literals.
11650 * The `core` crate was renamed to `std`.
11651 * The `std` crate was renamed to `extra`.
11652 * More and improved documentation.
11653 * std: `iterator` module for external iterator objects.
11654 * Many old-style (internal, higher-order function) iterators replaced by
11655 implementations of `Iterator`.
11656 * std: Many old internal vector and string iterators,
11657 incl. `any`, `all`. removed.
11658 * std: The `finalize` method of `Drop` renamed to `drop`.
11659 * std: The `drop` method now takes `&mut self` instead of `&self`.
11660 * std: The prelude no longer re-exports any modules, only types and traits.
11661 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11662 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11663 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11664 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11665 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11666 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11667 * std: Many types implement `Clone`.
11668 * std: `path` type renamed to `Path`.
11669 * std: `mut` module and `Mut` type removed.
11670 * std: Many standalone functions removed in favor of methods and iterators
11671 in `vec`, `str`. In the future methods will also work as functions.
11672 * std: `reinterpret_cast` removed. Use `transmute`.
11673 * std: ascii string handling in `std::ascii`.
11674 * std: `Rand` is implemented for ~/@.
11675 * std: `run` module for spawning processes overhauled.
11676 * std: Various atomic types added to `unstable::atomic`.
11677 * std: Various types implement `Zero`.
11678 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11679 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11680 * std: Added `os::mkdir_recursive`.
11681 * std: Added `os::glob` function performs filesystems globs.
11682 * std: `FuzzyEq` renamed to `ApproxEq`.
11683 * std: `Map` now defines `pop` and `swap` methods.
11684 * std: `Cell` constructors converted to static methods.
11685 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11686 * extra: `flate` module moved from `std` to `extra`.
11687 * extra: `fileinput` module for iterating over a series of files.
11688 * extra: `Complex` number type and `complex` module.
11689 * extra: `Rational` number type and `rational` module.
11690 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11691 * extra: `term` uses terminfo now, is more correct.
11692 * extra: `arc` functions converted to methods.
11693 * extra: Implementation of fixed output size variations of SHA-2.
11696 * `unused_variables` lint mode for unused variables (default: warn).
11697 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11699 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11701 * `dead_assignment` lint mode for unread variables (default: warn).
11702 * `unnecessary_allocation` lint mode detects some heap allocations that are
11703 immediately borrowed so could be written without allocating (default: warn).
11704 * `missing_doc` lint mode (default: allow).
11705 * `unreachable_code` lint mode (default: warn).
11706 * The `rusti` command has been rewritten and a number of bugs addressed.
11707 * rustc outputs in color on more terminals.
11708 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11709 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11710 * Compiling with `-g` will make the binary record information about
11711 dynamic borrowcheck failures for debugging.
11712 * rustdoc has a nicer stylesheet.
11713 * Various improvements to rustdoc.
11714 * Improvements to rustpkg (see the detailed release notes).
11717 Version 0.6 (2013-04-03)
11718 ========================
11720 * ~2100 changes, numerous bugfixes
11723 * The self type parameter in traits is now spelled `Self`
11724 * The `self` parameter in trait and impl methods must now be explicitly
11725 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11726 * Static methods no longer require the `static` keyword and instead
11727 are distinguished by the lack of a `self` parameter
11728 * Replaced the `Durable` trait with the `'static` lifetime
11729 * The old closure type syntax with the trailing sigil has been
11730 removed in favor of the more consistent leading sigil
11731 * `super` is a keyword, and may be prefixed to paths
11732 * Trait bounds are separated with `+` instead of whitespace
11733 * Traits are implemented with `impl Trait for Type`
11734 instead of `impl Type: Trait`
11735 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11736 * The `export` keyword has finally been removed
11737 * The `move` keyword has been removed (see "Semantic changes")
11738 * The interior mutability qualifier on vectors, `[mut T]`, has been
11739 removed. Use `&mut [T]`, etc.
11740 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11741 * `fail` is no longer a keyword. Use `fail!()`
11742 * `assert` is no longer a keyword. Use `assert!()`
11743 * `log` is no longer a keyword. use `debug!`, etc.
11744 * 1-tuples may be represented as `(T,)`
11745 * Struct fields may no longer be `mut`. Use inherited mutability,
11746 `@mut T`, `core::mut` or `core::cell`
11747 * `extern mod { ... }` is no longer valid syntax for foreign
11748 function modules. Use extern blocks: `extern { ... }`
11749 * Newtype enums removed. Use tuple-structs.
11750 * Trait implementations no longer support visibility modifiers
11751 * Pattern matching over vectors improved and expanded
11752 * `const` renamed to `static` to correspond to lifetime name,
11753 and make room for future `static mut` unsafe mutable globals.
11754 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11755 * `Clone` implementations can be automatically generated with
11756 `#[deriving(Clone)]`
11757 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11758 instead of `foo as Bar`.
11759 * Fixed length vector types are now written as `[int, .. 3]`
11760 instead of `[int * 3]`.
11761 * Fixed length vector types can express the length as a constant
11762 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11765 * Types with owned pointers or custom destructors move by default,
11766 eliminating the `move` keyword
11767 * All foreign functions are considered unsafe
11768 * &mut is now unaliasable
11769 * Writes to borrowed @mut pointers are prevented dynamically
11771 * The name of the main function can be customized using #[main]
11772 * The default type of an inferred closure is &fn instead of @fn
11773 * `use` statements may no longer be "chained" - they cannot import
11774 identifiers imported by previous `use` statements
11775 * `use` statements are crate relative, importing from the "top"
11776 of the crate by default. Paths may be prefixed with `super::`
11777 or `self::` to change the search behavior.
11778 * Method visibility is inherited from the implementation declaration
11779 * Structural records have been removed
11780 * Many more types can be used in static items, including enums
11781 'static-lifetime pointers and vectors
11782 * Pattern matching over vectors improved and expanded
11783 * Typechecking of closure types has been overhauled to
11784 improve inference and eliminate unsoundness
11785 * Macros leave scope at the end of modules, unless that module is
11786 tagged with #[macro_escape]
11789 * Added big integers to `std::bigint`
11790 * Removed `core::oldcomm` module
11791 * Added pipe-based `core::comm` module
11792 * Numeric traits have been reorganized under `core::num`
11793 * `vec::slice` finally returns a slice
11794 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11795 * Containers reorganized around traits in `core::container`
11796 * `core::dvec` removed, `~[T]` is a drop-in replacement
11797 * `core::send_map` renamed to `core::hashmap`
11798 * `std::map` removed; replaced with `core::hashmap`
11799 * `std::treemap` reimplemented as an owned balanced tree
11800 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11801 * `core::trie` added as a fast ordered map for integer keys
11802 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11803 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11804 overload the comparison operators, whereas `TotalOrd` is used
11805 by certain container types
11808 * Replaced the 'cargo' package manager with 'rustpkg'
11809 * Added all-purpose 'rust' tool
11810 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11811 * rustc now *attempts* to offer spelling suggestions
11812 * Improved support for ARM and Android
11813 * Preliminary MIPS backend
11814 * Improved foreign function ABI implementation for x86, x86_64
11815 * Various memory usage improvements
11816 * Rust code may be embedded in foreign code under limited circumstances
11817 * Inline assembler supported by new asm!() syntax extension.
11820 Version 0.5 (2012-12-21)
11821 ===========================
11823 * ~900 changes, numerous bugfixes
11826 * Removed `<-` move operator
11827 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11828 * Removed old fixed length vector syntax - `[T]/N`
11829 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11830 * Macros may now expand to items and statements
11831 * `a.b()` is always parsed as a method call, never as a field projection
11832 * `Eq` and `IterBytes` implementations can be automatically generated
11833 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11834 * Removed the special crate language for `.rc` files
11835 * Function arguments may consist of any irrefutable pattern
11838 * `&` and `~` pointers may point to objects
11839 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11840 * Enum variants may be structs
11841 * Destructors can be added to all nominal types with the Drop trait
11842 * Structs and nullary enum variants may be constants
11843 * Values that cannot be implicitly copied are now automatically moved
11844 without writing `move` explicitly
11845 * `&T` may now be coerced to `*T`
11846 * Coercions happen in `let` statements as well as function calls
11847 * `use` statements now take crate-relative paths
11848 * The module and type namespaces have been merged so that static
11849 method names can be resolved under the trait in which they are
11852 * Improved support for language features
11853 * Trait inheritance works in many scenarios
11854 * More support for explicit self arguments in methods - `self`, `&self`
11855 `@self`, and `~self` all generally work as expected
11856 * Static methods work in more situations
11857 * Experimental: Traits may declare default methods for the implementations
11861 * New condition handling system in `core::condition`
11862 * Timsort added to `std::sort`
11863 * New priority queue, `std::priority_queue`
11864 * Pipes for serializable types, `std::flatpipes'
11865 * Serialization overhauled to be trait-based
11866 * Expanded `getopts` definitions
11867 * Moved futures to `std`
11868 * More functions are pure now
11869 * `core::comm` renamed to `oldcomm`. Still deprecated
11870 * `rustdoc` and `cargo` are libraries now
11873 * Added a preliminary REPL, `rusti`
11874 * License changed from MIT to dual MIT/APL2
11877 Version 0.4 (2012-10-15)
11878 ==========================
11880 * ~2000 changes, numerous bugfixes
11883 * All keywords are now strict and may not be used as identifiers anywhere
11884 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11885 'of', 'with', 'to', 'class'.
11886 * Classes are replaced with simpler structs
11887 * Explicit method self types
11888 * `ret` became `return` and `alt` became `match`
11889 * `import` is now `use`; `use is now `extern mod`
11890 * `extern mod { ... }` is now `extern { ... }`
11891 * `use mod` is the recommended way to import modules
11892 * `pub` and `priv` replace deprecated export lists
11893 * The syntax of `match` pattern arms now uses fat arrow (=>)
11894 * `main` no longer accepts an args vector; use `os::args` instead
11897 * Trait implementations are now coherent, ala Haskell typeclasses
11898 * Trait methods may be static
11899 * Argument modes are deprecated
11900 * Borrowed pointers are much more mature and recommended for use
11901 * Strings and vectors in the static region are stored in constant memory
11902 * Typestate was removed
11903 * Resolution rewritten to be more reliable
11904 * Support for 'dual-mode' data structures (freezing and thawing)
11907 * Most binary operators can now be overloaded via the traits in
11909 * `std::net::url` for representing URLs
11910 * Sendable hash maps in `core::send_map`
11911 * `core::task' gained a (currently unsafe) task-local storage API
11914 * An efficient new intertask communication primitive called the pipe,
11915 along with a number of higher-level channel types, in `core::pipes`
11916 * `std::arc`, an atomically reference counted, immutable, shared memory
11918 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11919 * Futures are now based on pipes and sendable
11920 * More robust linked task failure
11921 * Improved task builder API
11924 * Improved error reporting
11925 * Preliminary JIT support
11926 * Preliminary work on precise GC
11927 * Extensive architectural improvements to rustc
11928 * Begun a transition away from buggy C++-based reflection (shape) code to
11929 Rust-based (visitor) code
11930 * All hash functions and tables converted to secure, randomized SipHash
11933 Version 0.3 (2012-07-12)
11934 ========================
11936 * ~1900 changes, numerous bugfixes
11938 * New coding conveniences
11939 * Integer-literal suffix inference
11940 * Per-item control over warnings, errors
11941 * #[cfg(windows)] and #[cfg(unix)] attributes
11942 * Documentation comments
11943 * More compact closure syntax
11944 * 'do' expressions for treating higher-order functions as
11946 * *-patterns (wildcard extended to all constructor fields)
11949 * Name resolution pass and exhaustiveness checker rewritten
11950 * Region pointers and borrow checking supersede alias
11952 * Init-ness checking is now provided by a region-based liveness
11953 pass instead of the typestate pass; same for last-use analysis
11954 * Extensive work on region pointers
11956 * Experimental new language features
11957 * Slices and fixed-size, interior-allocated vectors
11958 * #!-comments for lang versioning, shell execution
11959 * Destructors and iface implementation for classes;
11960 type-parameterized classes and class methods
11961 * 'const' type kind for types that can be used to implement
11962 shared-memory concurrency patterns
11966 * Removal of various obsolete features
11967 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11968 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11970 * Constructs: do-while loops ('do' repurposed), fn binding,
11971 resources (replaced by destructors)
11973 * Compiler reorganization
11974 * Syntax-layer of compiler split into separate crate
11975 * Clang (from LLVM project) integrated into build
11976 * Typechecker split into sub-modules
11979 * New time functions
11980 * Extension methods for many built-in types
11981 * Arc: atomic-refcount read-only / exclusive-use shared cells
11982 * Par: parallel map and search routines
11983 * Extensive work on libuv interface
11984 * Much vector code moved to libraries
11985 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11986 #include, #include_str, #include_bin
11988 * Tool improvements
11989 * Cargo automatically resolves dependencies
11992 Version 0.2 (2012-03-29)
11993 =========================
11995 * >1500 changes, numerous bugfixes
11997 * New docs and doc tooling
11999 * New port: FreeBSD x86_64
12001 * Compilation model enhancements
12002 * Generics now specialized, multiply instantiated
12003 * Functions now inlined across separate crates
12005 * Scheduling, stack and threading fixes
12006 * Noticeably improved message-passing performance
12007 * Explicit schedulers
12011 * Experimental new language features
12012 * Operator overloading
12016 * Various language extensions
12017 * C-callback function types: 'crust fn ...'
12018 * Infinite-loop construct: 'loop { ... }'
12019 * Shorten 'mutable' to 'mut'
12020 * Required mutable-local qualifier: 'let mut ...'
12021 * Basic glob-exporting: 'export foo::*;'
12022 * Alt now exhaustive, 'alt check' for runtime-checked
12023 * Block-function form of 'for' loop, with 'break' and 'ret'.
12026 * AST quasi-quote syntax extension
12027 * Revived libuv interface
12028 * New modules: core::{future, iter}, std::arena
12029 * Merged per-platform std::{os*, fs*} to core::{libc, os}
12030 * Extensive cleanup, regularization in libstd, libcore
12033 Version 0.1 (2012-01-20)
12034 ===============================
12036 * Most language features work, including:
12037 * Unique pointers, unique closures, move semantics
12038 * Interface-constrained generics
12039 * Static interface dispatch
12041 * Multithread task scheduling
12042 * Typestate predicates
12043 * Failure unwinding, destructors
12044 * Pattern matching and destructuring assignment
12045 * Lightweight block-lambda syntax
12046 * Preliminary macro-by-example
12048 * Compiler works with the following configurations:
12049 * Linux: x86 and x86_64 hosts and targets
12050 * macOS: x86 and x86_64 hosts and targets
12051 * Windows: x86 hosts and targets
12053 * Cross compilation / multi-target configuration supported.
12055 * Preliminary API-documentation and package-management tools included.
12059 * Documentation is incomplete.
12061 * Performance is below intended target.
12063 * Standard library APIs are subject to extensive change, reorganization.
12065 * Language-level versioning is not yet operational - future code will
12066 break unexpectedly.