1 Version 1.65.0 (2022-11-03)
2 ==========================
6 - [Error on `as` casts of enums with `#[non_exhaustive]` variants](https://github.com/rust-lang/rust/pull/92744/)
7 - [Stabilize `let else`](https://github.com/rust-lang/rust/pull/93628/)
8 - [Stabilize generic associated types (GATs)](https://github.com/rust-lang/rust/pull/96709/)
9 - [Add lints `let_underscore_drop` and `let_underscore_lock` from Clippy](https://github.com/rust-lang/rust/pull/97739/)
10 - [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")](https://github.com/rust-lang/rust/pull/99332/)
11 - [Uninitialized integers, floats, and raw pointers are now considered immediate UB](https://github.com/rust-lang/rust/pull/98919/).
12 Usage of `MaybeUninit` is the correct way to work with uninitialized memory.
13 - [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a](https://github.com/rust-lang/rust/pull/99916/)
14 - [Do not allow `Drop` impl on foreign ADTs](https://github.com/rust-lang/rust/pull/99576/)
18 - [Stabilize -Csplit-debuginfo on Linux](https://github.com/rust-lang/rust/pull/98051/)
19 - [Use niche-filling optimization even when multiple variants have data](https://github.com/rust-lang/rust/pull/94075/)
20 - [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)
21 - [Stringify non-shorthand visibility correctly](https://github.com/rust-lang/rust/pull/100350/)
22 - [Normalize struct field types when unsizing](https://github.com/rust-lang/rust/pull/101831/)
23 - [Update to LLVM 15](https://github.com/rust-lang/rust/pull/99464/)
24 - [Fix aarch64 call abi to correctly zeroext when needed](https://github.com/rust-lang/rust/pull/97800/)
25 - [debuginfo: Generalize C++-like encoding for enums](https://github.com/rust-lang/rust/pull/98393/)
26 - [Add `special_module_name` lint](https://github.com/rust-lang/rust/pull/94467/)
27 - [Add support for generating unique profraw files by default when using `-C instrument-coverage`](https://github.com/rust-lang/rust/pull/100384/)
28 - [Allow dynamic linking for iOS/tvOS targets](https://github.com/rust-lang/rust/pull/100636/)
32 - [Add armv4t-none-eabi as a tier 3 target](https://github.com/rust-lang/rust/pull/100244/)
33 - [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets](https://github.com/rust-lang/rust/pull/101025/)
34 - Refer to Rust's [platform support page][platform-support-doc] for more
35 information on Rust's tiered platform support.
40 - [Don't generate `PartialEq::ne` in derive(PartialEq)](https://github.com/rust-lang/rust/pull/98655/)
41 - [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default](https://github.com/rust-lang/rust/pull/101325/)
42 - [Forbid mixing `System` with direct system allocator calls](https://github.com/rust-lang/rust/pull/101394/)
43 - [Document no support for writing to non-blocking stdio/stderr](https://github.com/rust-lang/rust/pull/101416/)
44 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295)
45 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
50 - [`std::backtrace::Backtrace`](https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html)
51 - [`Bound::as_ref`](https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref)
52 - [`std::io::read_to_string`](https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html)
53 - [`<*const T>::cast_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut)
54 - [`<*mut T>::cast_const`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const)
56 These APIs are now stable in const contexts:
58 - [`<*const T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
59 - [`<*mut T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
64 - [Apply GitHub fast path even for partial hashes](https://github.com/rust-lang/cargo/pull/10807/)
65 - [Do not add home bin path to PATH if it's already there](https://github.com/rust-lang/cargo/pull/11023/)
66 - [Take priority into account within the pending queue](https://github.com/rust-lang/cargo/pull/11032/).
67 This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds.
72 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295).
73 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
74 - [`PollFn` now only implements `Unpin` if the closure is `Unpin`](https://github.com/rust-lang/rust/pull/102737).
75 This is a possible breaking change if users were relying on the blanket unpin implementation.
76 See discussion on the PR for details of why this change was made.
77 - [Drop ExactSizeIterator impl from std::char::EscapeAscii](https://github.com/rust-lang/rust/pull/99880)
78 This is a backwards-incompatible change to the standard library's surface
79 area, but is unlikely to affect real world usage.
80 - [Do not consider a single repeated lifetime eligible for elision in the return type](https://github.com/rust-lang/rust/pull/103450)
81 This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again.
82 - [Reenable disabled early syntax gates as future-incompatibility lints](https://github.com/rust-lang/rust/pull/99935/)
83 - [Update the minimum external LLVM to 13](https://github.com/rust-lang/rust/pull/100460/)
84 - [Don't duplicate file descriptors into stdio fds](https://github.com/rust-lang/rust/pull/101426/)
85 - [Sunset RLS](https://github.com/rust-lang/rust/pull/100863/)
86 - [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type](https://github.com/rust-lang/rust/pull/99784/)
87 This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny.
88 - [`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)
89 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.
90 - 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].
92 [102754]: https://github.com/rust-lang/rust/issues/102754
97 These changes do not affect any public interfaces of Rust, but they represent
98 significant improvements to the performance or internals of rustc and related
101 - [Add `x.sh` and `x.ps1` shell scripts](https://github.com/rust-lang/rust/pull/99992/)
102 - [compiletest: use target cfg instead of hard-coded tables](https://github.com/rust-lang/rust/pull/100260/)
103 - [Use object instead of LLVM for reading bitcode from rlibs](https://github.com/rust-lang/rust/pull/98100/)
104 - [Enable MIR inlining for optimized compilations](https://github.com/rust-lang/rust/pull/91743)
105 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).
107 Version 1.64.0 (2022-09-22)
108 ===========================
112 - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
113 - 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/)
114 - 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.
118 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
119 - Refer to Rust's [platform support page][platform-support-doc] for more
120 information on Rust's tiered platform support.
121 - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
122 - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
123 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
127 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
128 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
129 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
130 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
131 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
132 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
133 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
134 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
139 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
140 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
141 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
142 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
143 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
144 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
145 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
146 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
147 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
148 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
149 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
150 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
151 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
152 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
153 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
154 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
155 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
156 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
157 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
159 These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
161 - [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
162 - [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
163 - [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
164 - [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
165 - [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
166 - [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
168 These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
170 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
171 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
172 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
173 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
174 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
175 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
176 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
177 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
178 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
179 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
180 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
181 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
182 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
184 These APIs are now usable in const contexts:
186 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
190 - [Packages can now inherit settings from the workspace so that the settings
191 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
192 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
194 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
195 for more details on how to define these common settings.
196 - [Cargo commands can now accept multiple `--target` flags to build for
197 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
198 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
199 config option may now take an array of multiple targets.
200 - [The `--jobs` argument can now take a negative number to count backwards from
201 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
202 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
203 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
204 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
205 flag to `cargo rustc` to override the crate type.
206 - [Significantly improved the performance fetching git dependencies from GitHub
207 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
211 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
215 - 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/)
216 - [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.
217 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
218 - [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.
219 - [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.
220 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
221 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
222 - 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/).
223 - [`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.
228 These changes do not affect any public interfaces of Rust, but they represent
229 significant improvements to the performance or internals of rustc and related
232 - 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/)
233 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
234 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
235 - Many improvements to generated code for derives, including performance improvements:
236 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
237 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
238 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
239 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
240 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
241 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
242 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
243 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
244 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
245 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
246 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
248 Version 1.63.0 (2022-08-11)
249 ==========================
253 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
254 - [Modify MIR building to drop repeat expressions with length zero.][95953]
255 - [Remove label/lifetime shadowing warnings.][96296]
256 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
257 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
258 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
259 - [lub: don't bail out due to empty binders.][97867]
263 - [Stabilize the `bundle` native library modifier,][95818] also removing the
264 deprecated `static-nobundle` linking kind.
265 - [Add Apple WatchOS compile targets\*.][95243]
266 - [Add a Windows application manifest to rustc-main.][96737]
268 \* Refer to Rust's [platform support page][platform-support-doc] for more
269 information on Rust's tiered platform support.
273 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
274 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
275 - [`impl Read and Write for VecDeque<u8>`.][95632]
276 - [STD support for the Nintendo 3DS.][95897]
277 - [Use rounding in float to Duration conversion methods.][96051]
278 - [Make write/print macros eagerly drop temporaries.][96455]
279 - [Implement internal traits that enable `[OsStr]::join`.][96881]
280 - [Implement `Hash` for `core::alloc::Layout`.][97034]
281 - [Add capacity documentation for `OsString`.][97202]
282 - [Put a bound on collection misbehavior.][97316]
283 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
284 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
285 - [Document Rust's stance on `/proc/self/mem`.][97837]
292 - [`BinaryHeap::try_reserve`]
293 - [`BinaryHeap::try_reserve_exact`]
294 - [`OsString::try_reserve`]
295 - [`OsString::try_reserve_exact`]
296 - [`PathBuf::try_reserve`]
297 - [`PathBuf::try_reserve_exact`]
298 - [`Path::try_exists`]
299 - [`Ref::filter_map`]
300 - [`RefMut::filter_map`]
301 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
302 - [`ToOwned::clone_into`]
303 - [`Ipv6Addr::to_ipv4_mapped`]
305 - [`unix::io::BorrowedFd<'fd>`]
306 - [`unix::io::OwnedFd`]
307 - [`windows::io::AsHandle`]
308 - [`windows::io::BorrowedHandle<'handle>`]
309 - [`windows::io::OwnedHandle`]
310 - [`windows::io::HandleOrInvalid`]
311 - [`windows::io::HandleOrNull`]
312 - [`windows::io::InvalidHandleError`]
313 - [`windows::io::NullHandleError`]
314 - [`windows::io::AsSocket`]
315 - [`windows::io::BorrowedSocket<'handle>`]
316 - [`windows::io::OwnedSocket`]
319 - [`thread::ScopedJoinHandle`]
321 These APIs are now usable in const contexts:
323 - [`array::from_ref`]
324 - [`slice::from_ref`]
325 - [`intrinsics::copy`]
326 - [`intrinsics::copy_nonoverlapping`]
327 - [`<*const T>::copy_to`]
328 - [`<*const T>::copy_to_nonoverlapping`]
329 - [`<*mut T>::copy_to`]
330 - [`<*mut T>::copy_to_nonoverlapping`]
331 - [`<*mut T>::copy_from`]
332 - [`<*mut T>::copy_from_nonoverlapping`]
334 - [`Utf8Error::error_len`]
335 - [`Utf8Error::valid_up_to`]
342 - [Stabilize the `--config path` command-line argument.][cargo/10755]
343 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
348 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
349 errors for invalid attribute arguments that were previously ignored.
350 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
351 duration can differ slightly from what it was.
356 These changes provide no direct user facing benefits, but represent significant
357 improvements to the internals and overall performance of rustc
360 - [Prepare Rust for LLVM opaque pointers.][94214]
362 [94214]: https://github.com/rust-lang/rust/pull/94214/
363 [94530]: https://github.com/rust-lang/rust/pull/94530/
364 [94954]: https://github.com/rust-lang/rust/pull/94954/
365 [95243]: https://github.com/rust-lang/rust/pull/95243/
366 [95565]: https://github.com/rust-lang/rust/pull/95565/
367 [95632]: https://github.com/rust-lang/rust/pull/95632/
368 [95818]: https://github.com/rust-lang/rust/pull/95818/
369 [95897]: https://github.com/rust-lang/rust/pull/95897/
370 [95953]: https://github.com/rust-lang/rust/pull/95953/
371 [96051]: https://github.com/rust-lang/rust/pull/96051/
372 [96296]: https://github.com/rust-lang/rust/pull/96296/
373 [96455]: https://github.com/rust-lang/rust/pull/96455/
374 [96737]: https://github.com/rust-lang/rust/pull/96737/
375 [96868]: https://github.com/rust-lang/rust/pull/96868/
376 [96881]: https://github.com/rust-lang/rust/pull/96881/
377 [96885]: https://github.com/rust-lang/rust/pull/96885/
378 [96959]: https://github.com/rust-lang/rust/pull/96959/
379 [97034]: https://github.com/rust-lang/rust/pull/97034/
380 [97202]: https://github.com/rust-lang/rust/pull/97202/
381 [97316]: https://github.com/rust-lang/rust/pull/97316/
382 [97652]: https://github.com/rust-lang/rust/pull/97652/
383 [97675]: https://github.com/rust-lang/rust/pull/97675/
384 [97803]: https://github.com/rust-lang/rust/pull/97803/
385 [97837]: https://github.com/rust-lang/rust/pull/97837/
386 [97867]: https://github.com/rust-lang/rust/pull/97867/
387 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
388 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
390 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
391 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
392 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
393 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
394 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
395 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
396 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
397 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
398 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
399 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
400 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
401 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
402 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
403 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
404 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
405 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
406 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
407 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
408 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
409 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
410 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
411 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
412 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
413 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
414 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
415 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
416 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
417 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
418 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
419 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
421 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
422 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
423 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
424 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
425 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
426 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
427 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
428 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
429 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
430 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
431 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
432 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
433 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
434 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
435 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
436 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
438 Version 1.62.1 (2022-07-19)
439 ==========================
441 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
442 library, and also mitigates a CPU vulnerability on Intel SGX.
444 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
445 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
446 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
447 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
448 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
450 [98608]: https://github.com/rust-lang/rust/issues/98608
451 [98890]: https://github.com/rust-lang/rust/issues/98890
452 [98950]: https://github.com/rust-lang/rust/pull/98950
453 [98126]: https://github.com/rust-lang/rust/pull/98126
454 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
456 Version 1.62.0 (2022-06-30)
457 ==========================
462 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
463 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
464 - [Fix constants not getting dropped if part of a diverging expression][94775]
465 - [Support unit struct/enum variant in destructuring assignment][95380]
466 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
467 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
472 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
473 - [Make `unaligned_references` lint deny-by-default][95372]
474 This lint is also a future compatibility lint, and is expected to eventually
476 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
477 - [Reject `#[thread_local]` attribute on non-static items][95006]
478 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
479 - [Implement a lint to warn about unused macro rules][96150]
480 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
482 \* Refer to Rust's [platform support page][platform-support-doc] for more
483 information on Rust's tiered platform support.
488 - [Windows: Use a pipe relay for chaining pipes][95841]
489 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
490 - [Replace RwLock by a futex based one on Linux][95801]
491 - [std: directly use pthread in UNIX parker implementation][96393]
496 - [`bool::then_some`]
500 - [`windows::CommandExt::raw_arg`]
501 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
502 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
503 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
504 - [`FusedIterator for EncodeWide`]
505 - [RDM intrinsics on aarch64][stdarch/1285]
510 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
515 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
517 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
518 - Package ID specs now support `name@version` syntax in addition to the
519 previous `name:version` to align with the behavior in `cargo add` and other
520 tools. `cargo install` and `cargo yank` also now support this syntax so the
521 version does not need to passed as a separate flag.
522 - The `git` and `registry` directories in Cargo's home directory (usually
523 `~/.cargo`) are now marked as cache directories so that they are not
524 included in backups or content indexing (on Windows).
525 - Added automatic `@` argfile support, which will use "response files" if the
526 command-line to `rustc` exceeds the operating system's limit.
531 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
532 the same as the host target.
533 [#10594](https://github.com/rust-lang/cargo/pull/10594)
534 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
535 - [rustdoc: Remove .woff font files][96279]
536 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
537 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
538 complete synchronously][95469].
543 - [Unify ReentrantMutex implementations across all platforms][96042]
545 These changes provide no direct user facing benefits, but represent significant
546 improvements to the internals and overall performance of rustc
549 [93313]: https://github.com/rust-lang/rust/pull/93313/
550 [93969]: https://github.com/rust-lang/rust/pull/93969/
551 [94206]: https://github.com/rust-lang/rust/pull/94206/
552 [94457]: https://github.com/rust-lang/rust/pull/94457/
553 [94775]: https://github.com/rust-lang/rust/pull/94775/
554 [94872]: https://github.com/rust-lang/rust/pull/94872/
555 [95006]: https://github.com/rust-lang/rust/pull/95006/
556 [95035]: https://github.com/rust-lang/rust/pull/95035/
557 [95346]: https://github.com/rust-lang/rust/pull/95346/
558 [95372]: https://github.com/rust-lang/rust/pull/95372/
559 [95380]: https://github.com/rust-lang/rust/pull/95380/
560 [95431]: https://github.com/rust-lang/rust/pull/95431/
561 [95469]: https://github.com/rust-lang/rust/pull/95469/
562 [95705]: https://github.com/rust-lang/rust/pull/95705/
563 [95801]: https://github.com/rust-lang/rust/pull/95801/
564 [95819]: https://github.com/rust-lang/rust/pull/95819/
565 [95841]: https://github.com/rust-lang/rust/pull/95841/
566 [96042]: https://github.com/rust-lang/rust/pull/96042/
567 [96150]: https://github.com/rust-lang/rust/pull/96150/
568 [96268]: https://github.com/rust-lang/rust/pull/96268/
569 [96279]: https://github.com/rust-lang/rust/pull/96279/
570 [96393]: https://github.com/rust-lang/rust/pull/96393/
571 [96436]: https://github.com/rust-lang/rust/pull/96436/
572 [96557]: https://github.com/rust-lang/rust/pull/96557/
573 [96630]: https://github.com/rust-lang/rust/pull/96630/
575 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
576 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
577 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
578 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
579 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
580 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
581 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
582 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
583 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
584 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
586 Version 1.61.0 (2022-05-19)
587 ==========================
592 - [`const fn` signatures can now include generic trait bounds][93827]
593 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
594 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
595 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
600 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
601 - [The `char` type is now described as UTF-32 in debuginfo][89887]
602 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
603 - X86 [`#[target_feature = "adx"]` is now stable][93745]
608 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
609 - [`#[ignore = "…"]` messages are printed when running tests][92714]
610 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
611 - [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.
612 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
613 - [`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.
618 - [`Pin::static_mut`]
619 - [`Pin::static_ref`]
620 - [`Vec::retain_mut`]
621 - [`VecDeque::retain_mut`]
622 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
623 - [`std::os::unix::net::SocketAddr::from_pathname`]
624 - [`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.
625 - [`std::thread::JoinHandle::is_finished`]
627 These APIs are now usable in const contexts:
629 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
630 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
631 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
632 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
633 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
634 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
635 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
636 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
637 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
642 No feature changes, but see compatibility notes.
647 - 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
648 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
649 - (less common) or be updated to use the [`+whole-archive`] modifier.
650 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
651 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
652 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
653 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
654 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
655 - [`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`.
656 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
661 These changes provide no direct user facing benefits, but represent significant
662 improvements to the internals and overall performance of rustc
665 - [debuginfo: Refactor debuginfo generation for types][94261]
666 - [Remove the everybody loops pass][93913]
668 [88375]: https://github.com/rust-lang/rust/pull/88375/
669 [89887]: https://github.com/rust-lang/rust/pull/89887/
670 [90621]: https://github.com/rust-lang/rust/pull/90621/
671 [92285]: https://github.com/rust-lang/rust/pull/92285/
672 [92472]: https://github.com/rust-lang/rust/pull/92472/
673 [92697]: https://github.com/rust-lang/rust/pull/92697/
674 [92714]: https://github.com/rust-lang/rust/pull/92714/
675 [92911]: https://github.com/rust-lang/rust/pull/92911/
676 [93263]: https://github.com/rust-lang/rust/pull/93263/
677 [93745]: https://github.com/rust-lang/rust/pull/93745/
678 [93827]: https://github.com/rust-lang/rust/pull/93827/
679 [93901]: https://github.com/rust-lang/rust/pull/93901/
680 [93913]: https://github.com/rust-lang/rust/pull/93913/
681 [93965]: https://github.com/rust-lang/rust/pull/93965/
682 [94081]: https://github.com/rust-lang/rust/pull/94081/
683 [94261]: https://github.com/rust-lang/rust/pull/94261/
684 [94295]: https://github.com/rust-lang/rust/pull/94295/
685 [94832]: https://github.com/rust-lang/rust/pull/94832/
686 [95016]: https://github.com/rust-lang/rust/pull/95016/
687 [95251]: https://github.com/rust-lang/rust/pull/95251/
688 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
689 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
690 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
691 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
692 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
693 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
694 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
695 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
696 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
697 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
698 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
699 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
700 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
701 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
702 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
703 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
704 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
705 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
706 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
707 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
708 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
709 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
712 Version 1.60.0 (2022-04-07)
713 ==========================
717 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
718 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
722 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
723 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
724 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
725 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
726 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
727 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
728 - [Fix invalid removal of newlines from doc comments][92357]
729 - [Add kernel target for RustyHermit][92670]
730 - [Deny mixing bin crate type with lib crate types][92933]
731 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
732 - [Upgrade to LLVM 14][93577]
734 \* Refer to Rust's [platform support page][platform-support-doc] for more
735 information on Rust's tiered platform support.
739 - [Guarantee call order for `sort_by_cached_key`][89621]
740 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
741 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
742 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
743 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
747 - [`Arc::new_cyclic`][arc_new_cyclic]
748 - [`Rc::new_cyclic`][rc_new_cyclic]
749 - [`slice::EscapeAscii`][slice_escape_ascii]
750 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
751 - [`u8::escape_ascii`][u8_escape_ascii]
752 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
753 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
754 - [`MaybeUninit::assume_init_read`][assume_init_read]
755 - [`i8::abs_diff`][i8_abs_diff]
756 - [`i16::abs_diff`][i16_abs_diff]
757 - [`i32::abs_diff`][i32_abs_diff]
758 - [`i64::abs_diff`][i64_abs_diff]
759 - [`i128::abs_diff`][i128_abs_diff]
760 - [`isize::abs_diff`][isize_abs_diff]
761 - [`u8::abs_diff`][u8_abs_diff]
762 - [`u16::abs_diff`][u16_abs_diff]
763 - [`u32::abs_diff`][u32_abs_diff]
764 - [`u64::abs_diff`][u64_abs_diff]
765 - [`u128::abs_diff`][u128_abs_diff]
766 - [`usize::abs_diff`][usize_abs_diff]
767 - [`Display for io::ErrorKind`][display_error_kind]
768 - [`From<u8> for ExitCode`][from_u8_exit_code]
769 - [`Not for !` (the "never" type)][not_never]
770 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
771 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
775 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
776 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
777 - [Stabilize namespaced and weak dependency features.][cargo/10269]
778 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
779 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
783 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
784 - [Drop rustc-docs from complete profile][93742]
785 - [bootstrap: tidy up flag handling for llvm build][93918]
789 - [Remove compiler-rt linking hack on Android][83822]
790 - [Mitigations for platforms with non-monotonic clocks have been removed from
791 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
792 instant is not guaranteed to be greater than an earlier instant anymore.
793 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
794 saturating to `0` instead][89926]. In the real world the panic happened mostly
795 on platforms with buggy monotonic clock implementations rather than catching
796 programming errors like reversing the start and end times. Such programming
797 errors will now results in `0` rather than a panic.
798 - In a future release we're planning to increase the baseline requirements for
799 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
800 your feedback in [PR #95026][95026].
805 These changes provide no direct user facing benefits, but represent significant
806 improvements to the internals and overall performance of rustc
809 - [Switch all libraries to the 2021 edition][92068]
811 [83822]: https://github.com/rust-lang/rust/pull/83822
812 [86374]: https://github.com/rust-lang/rust/pull/86374
813 [87487]: https://github.com/rust-lang/rust/pull/87487
814 [89621]: https://github.com/rust-lang/rust/pull/89621
815 [89926]: https://github.com/rust-lang/rust/pull/89926
816 [90132]: https://github.com/rust-lang/rust/pull/90132
817 [90247]: https://github.com/rust-lang/rust/pull/90247
818 [91606]: https://github.com/rust-lang/rust/pull/91606
819 [92068]: https://github.com/rust-lang/rust/pull/92068
820 [92300]: https://github.com/rust-lang/rust/pull/92300
821 [92357]: https://github.com/rust-lang/rust/pull/92357
822 [92383]: https://github.com/rust-lang/rust/pull/92383
823 [92630]: https://github.com/rust-lang/rust/pull/92630
824 [92670]: https://github.com/rust-lang/rust/pull/92670
825 [92800]: https://github.com/rust-lang/rust/pull/92800
826 [92933]: https://github.com/rust-lang/rust/pull/92933
827 [93566]: https://github.com/rust-lang/rust/pull/93566
828 [93577]: https://github.com/rust-lang/rust/pull/93577
829 [93658]: https://github.com/rust-lang/rust/pull/93658
830 [93742]: https://github.com/rust-lang/rust/pull/93742
831 [93824]: https://github.com/rust-lang/rust/pull/93824
832 [93918]: https://github.com/rust-lang/rust/pull/93918
833 [95026]: https://github.com/rust-lang/rust/pull/95026
835 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
836 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
837 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
838 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
839 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
841 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
842 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
843 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
844 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
845 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
846 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
847 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
848 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
849 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
850 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
851 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
852 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
853 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
854 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
855 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
856 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
857 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
858 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
859 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
860 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
861 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
862 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
863 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
864 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
865 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
867 Version 1.59.0 (2022-02-24)
868 ==========================
873 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
874 - [Stabilize destructuring assignment][90521]
875 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
876 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
881 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
882 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
883 - [Fix sparc64 ABI for aggregates with floating point members][91003]
884 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
885 - [Add support for riscv64gc-unknown-freebsd][91284]
886 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
887 - [Soft disable incremental compilation][94124]
889 This release disables incremental compilation, unless the user has explicitly
890 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
891 This is due to a known and relatively frequently occurring bug in incremental
892 compilation, which causes builds to issue internal compiler errors. This
893 particular bug is already fixed on nightly, but that fix has not yet rolled out
894 to stable and is deemed too risky for a direct stable backport.
896 As always, we encourage users to test with nightly and report bugs so that we
897 can track failures and fix issues earlier.
899 See [94124] for more details.
901 [94124]: https://github.com/rust-lang/rust/issues/94124
906 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
911 - [`std::thread::available_parallelism`][available_parallelism]
912 - [`Result::copied`][result-copied]
913 - [`Result::cloned`][result-cloned]
914 - [`arch::asm!`][asm]
915 - [`arch::global_asm!`][global_asm]
916 - [`ops::ControlFlow::is_break`][is_break]
917 - [`ops::ControlFlow::is_continue`][is_continue]
918 - [`TryFrom<char> for u8`][try_from_char_u8]
919 - [`char::TryFromCharError`][try_from_char_err]
920 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
922 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
923 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
924 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
925 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
926 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
927 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
928 - [`DoubleEndedIterator for ToLowercase`][lowercase]
929 - [`DoubleEndedIterator for ToUppercase`][uppercase]
930 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
931 - [`UnwindSafe for Once`][unwindsafe_once]
932 - [`RefUnwindSafe for Once`][refunwindsafe_once]
933 - [armv8 neon intrinsics for aarch64][stdarch/1266]
937 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
938 - [`mem::MaybeUninit::assume_init`][muninit_init]
939 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
940 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
945 - [Stabilize the `strip` profile option][cargo/10088]
946 - [Stabilize future-incompat-report][cargo/10165]
947 - [Support abbreviating `--release` as `-r`][cargo/10133]
948 - [Support `term.quiet` configuration][cargo/10152]
949 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
954 - [Refactor weak symbols in std::sys::unix][90846]
955 This may add new, versioned, symbols when building with a newer glibc, as the
956 standard library uses weak linkage rather than dynamically attempting to load
957 certain symbols at runtime.
958 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
959 This adds a future compatibility lint to supporting the use of cfg_attr
960 wrapping either crate_type or crate_name specification within Rust files;
961 it is recommended that users migrate to setting the equivalent command line
963 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
964 This may expose new names, leading to conflicts with preexisting names in a
965 given namespace and a compilation failure.
966 - [Cargo will document libraries before binaries.][cargo/10172]
967 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
968 - [Weaken guarantee around advancing underlying iterators in zip][83791]
969 - [Make split_inclusive() on an empty slice yield an empty output][89825]
970 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
971 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
976 These changes provide no direct user facing benefits, but represent significant
977 improvements to the internals and overall performance of rustc
980 - [Fix many cases of normalization-related ICEs][91255]
981 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
982 - [Store liveness in interval sets for region inference][90637]
984 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
985 unstable feature.][91867]
987 [91867]: https://github.com/rust-lang/rust/issues/91867
988 [83744]: https://github.com/rust-lang/rust/pull/83744/
989 [83791]: https://github.com/rust-lang/rust/pull/83791/
990 [85013]: https://github.com/rust-lang/rust/pull/85013/
991 [89825]: https://github.com/rust-lang/rust/pull/89825/
992 [89999]: https://github.com/rust-lang/rust/pull/89999/
993 [90128]: https://github.com/rust-lang/rust/pull/90128/
994 [90207]: https://github.com/rust-lang/rust/pull/90207/
995 [90521]: https://github.com/rust-lang/rust/pull/90521/
996 [90586]: https://github.com/rust-lang/rust/pull/90586/
997 [90637]: https://github.com/rust-lang/rust/pull/90637/
998 [90833]: https://github.com/rust-lang/rust/pull/90833/
999 [90846]: https://github.com/rust-lang/rust/pull/90846/
1000 [91003]: https://github.com/rust-lang/rust/pull/91003/
1001 [91172]: https://github.com/rust-lang/rust/pull/91172/
1002 [91255]: https://github.com/rust-lang/rust/pull/91255/
1003 [91284]: https://github.com/rust-lang/rust/pull/91284/
1004 [91535]: https://github.com/rust-lang/rust/pull/91535/
1005 [91593]: https://github.com/rust-lang/rust/pull/91593/
1006 [91728]: https://github.com/rust-lang/rust/pull/91728/
1007 [91878]: https://github.com/rust-lang/rust/pull/91878/
1008 [91896]: https://github.com/rust-lang/rust/pull/91896/
1009 [91926]: https://github.com/rust-lang/rust/pull/91926/
1010 [91984]: https://github.com/rust-lang/rust/pull/91984/
1011 [92020]: https://github.com/rust-lang/rust/pull/92020/
1012 [92034]: https://github.com/rust-lang/rust/pull/92034/
1013 [92137]: https://github.com/rust-lang/rust/pull/92137/
1014 [92483]: https://github.com/rust-lang/rust/pull/92483/
1015 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
1016 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
1017 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
1018 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
1019 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
1020 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
1021 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
1022 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
1024 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
1025 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
1026 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
1027 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1028 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
1029 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
1030 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
1031 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
1032 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
1033 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
1034 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
1035 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
1036 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
1037 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
1038 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
1039 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
1040 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
1041 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
1042 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
1043 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
1044 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
1045 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
1046 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
1047 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
1048 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
1049 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
1051 Version 1.58.1 (2022-01-19)
1052 ===========================
1054 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
1055 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
1056 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
1057 * [Fix wrong error message displayed when some imports are missing][91254]
1058 * [Fix rustfmt not formatting generated files from stdin][92912]
1060 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
1061 [91254]: https://github.com/rust-lang/rust/pull/91254
1062 [92912]: https://github.com/rust-lang/rust/pull/92912
1063 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
1064 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
1066 Version 1.58.0 (2022-01-13)
1067 ==========================
1072 - [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.
1073 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
1074 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
1079 - [Add LLVM CFI support to the Rust compiler][89652]
1080 - [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.
1081 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
1082 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
1083 - [Update the minimum external LLVM to 12][90175]
1084 - [Add `x86_64-unknown-none` at Tier 3*][89062]
1085 - [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.
1086 - [Don't abort compilation after giving a lint error][87337]
1087 - [Error messages point at the source of trait bound obligations in more places][89580]
1089 \* Refer to Rust's [platform support page][platform-support-doc] for more
1090 information on Rust's tiered platform support.
1095 - [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.
1096 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
1097 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
1098 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
1099 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
1100 - [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).
1105 - [`Metadata::is_symlink`]
1106 - [`Path::is_symlink`]
1107 - [`{integer}::saturating_div`]
1108 - [`Option::unwrap_unchecked`]
1109 - [`Result::unwrap_unchecked`]
1110 - [`Result::unwrap_err_unchecked`]
1113 These APIs are now usable in const contexts:
1116 - [`Duration::checked_add`]
1117 - [`Duration::saturating_add`]
1118 - [`Duration::checked_sub`]
1119 - [`Duration::saturating_sub`]
1120 - [`Duration::checked_mul`]
1121 - [`Duration::saturating_mul`]
1122 - [`Duration::checked_div`]
1127 - [Add --message-format for install command][cargo/10107]
1128 - [Warn when alias shadows external subcommand][cargo/10082]
1133 - [Show all Deref implementations recursively in rustdoc][90183]
1134 - [Use computed visibility in rustdoc][88447]
1139 - [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.
1140 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1141 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1142 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1143 - [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.
1144 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1149 These changes provide no direct user facing benefits, but represent significant
1150 improvements to the internals and overall performance of rustc
1153 - [Implement coherence checks for negative trait impls][90104]
1154 - [Add rustc lint, warning when iterating over hashmaps][89558]
1155 - [Optimize live point computation][90491]
1156 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1157 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1159 [87337]: https://github.com/rust-lang/rust/pull/87337/
1160 [87467]: https://github.com/rust-lang/rust/pull/87467/
1161 [87704]: https://github.com/rust-lang/rust/pull/87704/
1162 [88041]: https://github.com/rust-lang/rust/pull/88041/
1163 [88447]: https://github.com/rust-lang/rust/pull/88447/
1164 [88601]: https://github.com/rust-lang/rust/pull/88601/
1165 [89062]: https://github.com/rust-lang/rust/pull/89062/
1166 [89174]: https://github.com/rust-lang/rust/pull/89174/
1167 [89551]: https://github.com/rust-lang/rust/pull/89551/
1168 [89558]: https://github.com/rust-lang/rust/pull/89558/
1169 [89580]: https://github.com/rust-lang/rust/pull/89580/
1170 [89652]: https://github.com/rust-lang/rust/pull/89652/
1171 [90041]: https://github.com/rust-lang/rust/pull/90041/
1172 [90058]: https://github.com/rust-lang/rust/pull/90058/
1173 [90104]: https://github.com/rust-lang/rust/pull/90104/
1174 [90117]: https://github.com/rust-lang/rust/pull/90117/
1175 [90175]: https://github.com/rust-lang/rust/pull/90175/
1176 [90183]: https://github.com/rust-lang/rust/pull/90183/
1177 [90297]: https://github.com/rust-lang/rust/pull/90297/
1178 [90329]: https://github.com/rust-lang/rust/pull/90329/
1179 [90361]: https://github.com/rust-lang/rust/pull/90361/
1180 [90417]: https://github.com/rust-lang/rust/pull/90417/
1181 [90473]: https://github.com/rust-lang/rust/pull/90473/
1182 [90491]: https://github.com/rust-lang/rust/pull/90491/
1183 [90733]: https://github.com/rust-lang/rust/pull/90733/
1184 [90833]: https://github.com/rust-lang/rust/pull/90833/
1185 [90846]: https://github.com/rust-lang/rust/pull/90846/
1186 [91026]: https://github.com/rust-lang/rust/pull/91026/
1187 [91207]: https://github.com/rust-lang/rust/pull/91207/
1188 [91255]: https://github.com/rust-lang/rust/pull/91255/
1189 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1190 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1191 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1192 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1193 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1194 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1195 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1196 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1197 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1198 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1200 Version 1.57.0 (2021-12-02)
1201 ==========================
1206 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1207 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1208 - [Allow panicking in constant evaluation.][89508]
1209 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1214 - [Create more accurate debuginfo for vtables.][89597]
1215 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1216 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1217 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1218 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1220 \* Refer to Rust's [platform support page][platform-support-doc] for more
1221 information on Rust's tiered platform support.
1226 - [Avoid allocations and copying in `Vec::leak`][89337]
1227 - [Add `#[repr(i8)]` to `Ordering`][89507]
1228 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1229 - [Update to Unicode 14.0][89614]
1230 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1231 when ignoring their return value. This helps catch mistakes such as expecting
1232 a function to mutate a value in place rather than return a new value.
1237 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1238 - [`[T; N]::as_slice`][`array::as_slice`]
1239 - [`collections::TryReserveError`]
1240 - [`HashMap::try_reserve`]
1241 - [`HashSet::try_reserve`]
1242 - [`String::try_reserve`]
1243 - [`String::try_reserve_exact`]
1244 - [`Vec::try_reserve`]
1245 - [`Vec::try_reserve_exact`]
1246 - [`VecDeque::try_reserve`]
1247 - [`VecDeque::try_reserve_exact`]
1248 - [`Iterator::map_while`]
1249 - [`iter::MapWhile`]
1250 - [`proc_macro::is_available`]
1251 - [`Command::get_program`]
1252 - [`Command::get_args`]
1253 - [`Command::get_envs`]
1254 - [`Command::get_current_dir`]
1258 These APIs are now usable in const contexts:
1260 - [`hint::unreachable_unchecked`]
1265 - [Stabilize custom profiles][cargo/9943]
1270 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1271 This will break some builds that set `#![deny(dead_code)]`.
1275 These changes provide no direct user facing benefits, but represent significant
1276 improvements to the internals and overall performance of rustc
1279 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1281 [85200]: https://github.com/rust-lang/rust/pull/85200/
1282 [86191]: https://github.com/rust-lang/rust/pull/86191/
1283 [87220]: https://github.com/rust-lang/rust/pull/87220/
1284 [87260]: https://github.com/rust-lang/rust/pull/87260/
1285 [88321]: https://github.com/rust-lang/rust/pull/88321/
1286 [88529]: https://github.com/rust-lang/rust/pull/88529/
1287 [88690]: https://github.com/rust-lang/rust/pull/88690/
1288 [88952]: https://github.com/rust-lang/rust/pull/88952/
1289 [89337]: https://github.com/rust-lang/rust/pull/89337/
1290 [89507]: https://github.com/rust-lang/rust/pull/89507/
1291 [89508]: https://github.com/rust-lang/rust/pull/89508/
1292 [89582]: https://github.com/rust-lang/rust/pull/89582/
1293 [89597]: https://github.com/rust-lang/rust/pull/89597/
1294 [89614]: https://github.com/rust-lang/rust/pull/89614/
1295 [89692]: https://github.com/rust-lang/rust/issues/89692/
1296 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1297 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1298 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1299 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1300 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1301 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1302 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1303 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1304 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1305 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1306 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1307 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1308 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1309 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1310 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1311 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1312 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1313 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1314 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1315 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1316 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1318 Version 1.56.1 (2021-11-01)
1319 ===========================
1321 - New lints to detect the presence of bidirectional-override Unicode
1322 codepoints in the compiled source code ([CVE-2021-42574])
1324 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1326 Version 1.56.0 (2021-10-21)
1327 ========================
1332 - [The 2021 Edition is now stable.][rust#88100]
1333 See [the edition guide][rust-2021-edition-guide] for more details.
1334 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1335 - [Union field access is permitted in `const fn`.][rust#85769]
1337 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1342 - [Upgrade to LLVM 13.][rust#87570]
1343 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1344 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1345 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1346 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1347 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1348 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1349 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1351 \* Refer to Rust's [platform support page][platform-support-doc] for more
1352 information on Rust's tiered platform support.
1357 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1358 The Windows console still requires valid Unicode, but this change allows
1359 splitting a UTF-8 character across multiple write calls. This allows, for
1360 instance, programs that just read and write data buffers (e.g. copying a file
1361 to stdout) without regard for Unicode or character boundaries.
1362 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1363 For this use case, atomics scale much better under contention.
1364 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1365 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1366 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1367 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1368 - [Treat invalid environment variable names as non-existent.][rust#86183]
1369 Previously, the environment functions would panic if given a variable name
1370 with an internal null character or equal sign (`=`). Now, these functions will
1371 just treat such names as non-existent variables, since the OS cannot represent
1372 the existence of a variable with such a name.
1377 - [`std::os::unix::fs::chroot`]
1378 - [`UnsafeCell::raw_get`]
1379 - [`BufWriter::into_parts`]
1380 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1381 These APIs were previously stable in `std`, but are now also available in `core`.
1382 - [`Vec::shrink_to`]
1383 - [`String::shrink_to`]
1384 - [`OsString::shrink_to`]
1385 - [`PathBuf::shrink_to`]
1386 - [`BinaryHeap::shrink_to`]
1387 - [`VecDeque::shrink_to`]
1388 - [`HashMap::shrink_to`]
1389 - [`HashSet::shrink_to`]
1391 These APIs are now usable in const contexts:
1393 - [`std::mem::transmute`]
1394 - [`[T]::first`][`slice::first`]
1395 - [`[T]::split_first`][`slice::split_first`]
1396 - [`[T]::last`][`slice::last`]
1397 - [`[T]::split_last`][`slice::split_last`]
1402 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1403 This has no effect at present on dependency version selection.
1404 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1405 that support Rust code to include a crate's specified minimum version in the test matrix for that
1411 - [Update to new argument parsing rules on Windows.][rust#87580]
1412 This adjusts Rust's standard library to match the behavior of the standard
1413 libraries for C/C++. The rules have changed slightly over time, and this PR
1414 brings us to the latest set of rules (changed in 2008).
1415 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1416 This was already not supported by LLVM; this change surfaces this lack of
1417 support with a better error message.
1418 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1419 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1420 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1421 may return different values on glibc <= 2.24.][rust#81825]
1422 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1423 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1424 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1425 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1429 These changes provide no direct user facing benefits, but represent significant
1430 improvements to the internals and overall performance of rustc
1433 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1434 This improves the performance of most Rust builds.
1435 - [Unify representation of macros in internal data structures.][rust#88019]
1436 This change fixes a host of bugs with the handling of macros by the compiler,
1439 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1440 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1441 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1442 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1443 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1444 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1445 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1446 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1447 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1448 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1449 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1450 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1451 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1452 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1453 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1454 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1455 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1456 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1457 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1458 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1459 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1460 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1461 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1462 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1463 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1464 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1465 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1466 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1467 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1468 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1469 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1470 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1471 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1472 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1473 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1474 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1475 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1476 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1477 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1478 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1479 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1480 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1482 Version 1.55.0 (2021-09-09)
1483 ============================
1487 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1488 will end at the maximum value of the integer.][83918]
1489 - [You can now explicitly import the prelude of different editions
1490 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1494 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1496 \* Refer to Rust's [platform support page][platform-support-doc] for more
1497 information on Rust's tiered platform support.
1502 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1503 These improvements should in general provide faster string parsing of floats,
1504 no longer reject certain valid floating point values, and reduce
1505 the produced code size for non-stripped artifacts.
1506 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1513 - [`IntoInnerError::into_error`]
1514 - [`IntoInnerError::into_parts`]
1515 - [`MaybeUninit::assume_init_mut`]
1516 - [`MaybeUninit::assume_init_ref`]
1517 - [`MaybeUninit::write`]
1519 - [`ops::ControlFlow`]
1521 - [`x86::_bittestandcomplement`]
1522 - [`x86::_bittestandreset`]
1523 - [`x86::_bittestandset`]
1524 - [`x86_64::_bittest64`]
1525 - [`x86_64::_bittestandcomplement64`]
1526 - [`x86_64::_bittestandreset64`]
1527 - [`x86_64::_bittestandset64`]
1529 The following previously stable functions are now `const`.
1531 - [`str::from_utf8_unchecked`]
1536 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1537 rustc in parallel such as when using `cargo test`.][cargo/9675]
1538 - [The package definition in `cargo metadata` now includes the `"default_run"`
1539 field from the manifest.][cargo/9550]
1540 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1541 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1542 of packages.][cargo/9663]
1546 - [Added "Go to item on exact match" search option.][85876]
1547 - [The "Implementors" section on traits no longer shows redundant
1548 method definitions.][85970]
1549 - [Trait implementations are toggled open by default.][86260] This should make the
1550 implementations more searchable by tools like `CTRL+F` in your browser.
1551 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1552 through type aliases.][86334]
1553 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1554 "Trait Implementations" section.][86513]
1559 - [std functions that return an `io::Error` will no longer use the
1560 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1561 kinds of errors could be categorised [into newer more specific `ErrorKind`
1562 variants][79965], and that they do not represent a user error.
1563 - [Using environment variable names with `process::Command` on Windows now
1564 behaves as expected.][85270] Previously using envionment variables with
1565 `Command` would cause them to be ASCII-uppercased.
1566 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1567 with `rustdoc::`][86849]
1568 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1569 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1570 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1573 [86849]: https://github.com/rust-lang/rust/pull/86849
1574 [86513]: https://github.com/rust-lang/rust/pull/86513
1575 [86334]: https://github.com/rust-lang/rust/pull/86334
1576 [86260]: https://github.com/rust-lang/rust/pull/86260
1577 [85970]: https://github.com/rust-lang/rust/pull/85970
1578 [85876]: https://github.com/rust-lang/rust/pull/85876
1579 [83572]: https://github.com/rust-lang/rust/pull/83572
1580 [86294]: https://github.com/rust-lang/rust/pull/86294
1581 [86858]: https://github.com/rust-lang/rust/pull/86858
1582 [86761]: https://github.com/rust-lang/rust/pull/86761
1583 [85746]: https://github.com/rust-lang/rust/pull/85746
1584 [85270]: https://github.com/rust-lang/rust/pull/85270
1585 [83918]: https://github.com/rust-lang/rust/pull/83918
1586 [79965]: https://github.com/rust-lang/rust/pull/79965
1587 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1588 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1589 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1590 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1591 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1592 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1593 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1594 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1595 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1596 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1597 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1598 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1599 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1600 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1601 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1602 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1603 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1604 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1605 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1606 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1607 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1608 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1611 Version 1.54.0 (2021-07-29)
1612 ============================
1615 -----------------------
1617 - [You can now use macros for values in some built-in attributes.][83366]
1618 This primarily allows you to call macros within the `#[doc]` attribute. For
1619 example, to include external documentation in your crate, you can now write
1622 #![doc = include_str!("README.md")]
1625 - [You can now cast between unsized slice types (and types which contain
1626 unsized slices) in `const fn`.][85078]
1627 - [You can now use multiple generic lifetimes with `impl Trait` where the
1628 lifetimes don't explicitly outlive another.][84701] In code this means
1629 that you can now have `impl Trait<'a, 'b>` where as before you could
1630 only have `impl Trait<'a, 'b> where 'b: 'a`.
1633 -----------------------
1635 - [Rustc will now search for custom JSON targets in
1636 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1637 directory.][83800] You can find your sysroot directory by running
1638 `rustc --print sysroot`.
1639 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1640 - [You can now use `#[target_feature]` on safe functions when targeting
1641 WebAssembly platforms.][84988]
1642 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1643 - [Added tier 3\* support for `bpfel-unknown-none`
1644 and `bpfeb-unknown-none`.][79608]
1645 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1647 \* Refer to Rust's [platform support page][platform-support-doc] for more
1648 information on Rust's tiered platform support.
1651 -----------------------
1653 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1654 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1655 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1656 - [The implementations of vendor intrinsics in core::arch have been
1657 significantly refactored.][83278] The main user-visible changes are
1658 a 50% reduction in the size of libcore.rlib and stricter validation
1659 of constant operands passed to intrinsics. The latter is technically
1660 a breaking change, but allows Rust to more closely match the C vendor
1666 - [`BTreeMap::into_keys`]
1667 - [`BTreeMap::into_values`]
1668 - [`HashMap::into_keys`]
1669 - [`HashMap::into_values`]
1671 - [`VecDeque::binary_search`]
1672 - [`VecDeque::binary_search_by`]
1673 - [`VecDeque::binary_search_by_key`]
1674 - [`VecDeque::partition_point`]
1679 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1680 the dependency graph.][cargo/9520]
1681 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1682 in the tree ][cargo/9499]
1683 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1684 macro dependencies.][cargo/9488]
1685 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1686 This variable points to a directory that integration tests and benches
1687 can use as a "scratchpad" for testing filesystem operations.
1691 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1692 - [Previously unsound code is no longer permitted where different constructors in branches
1693 could require different lifetimes.][85574]
1694 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1695 than before and may reject some previously accepted code.
1696 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1697 when compiled with `codegen-units = 1`.][86063]
1699 [85574]: https://github.com/rust-lang/rust/issues/85574
1700 [86831]: https://github.com/rust-lang/rust/issues/86831
1701 [86063]: https://github.com/rust-lang/rust/issues/86063
1702 [79608]: https://github.com/rust-lang/rust/pull/79608
1703 [84988]: https://github.com/rust-lang/rust/pull/84988
1704 [84701]: https://github.com/rust-lang/rust/pull/84701
1705 [84072]: https://github.com/rust-lang/rust/pull/84072
1706 [85745]: https://github.com/rust-lang/rust/pull/85745
1707 [84744]: https://github.com/rust-lang/rust/pull/84744
1708 [85078]: https://github.com/rust-lang/rust/pull/85078
1709 [84717]: https://github.com/rust-lang/rust/pull/84717
1710 [83800]: https://github.com/rust-lang/rust/pull/83800
1711 [83366]: https://github.com/rust-lang/rust/pull/83366
1712 [83278]: https://github.com/rust-lang/rust/pull/83278
1713 [85292]: https://github.com/rust-lang/rust/pull/85292
1714 [82834]: https://github.com/rust-lang/rust/pull/82834
1715 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1716 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1717 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1718 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1719 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1720 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1721 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1722 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1723 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1724 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1725 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1727 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1729 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1731 Version 1.53.0 (2021-06-17)
1732 ============================
1735 -----------------------
1736 - [You can now use unicode for identifiers.][83799] This allows multilingual
1737 identifiers but still doesn't allow glyphs that are not considered characters
1738 such as `◆` or `🦀`. More specifically you can now use any identifier that
1739 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1740 is the same standard as languages like Python, however Rust uses NFC
1741 normalization which may be different from other languages.
1742 - [You can now specify "or patterns" inside pattern matches.][79278]
1743 Previously you could only use `|` (OR) on complete patterns. E.g.
1747 matches!(x, Some(1) | Some(2));
1749 matches!(x, Some(1 | 2));
1751 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1752 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1753 to change semantics to being a pattern fragment in a future edition.
1756 -----------------------
1757 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1758 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1759 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1761 \* Refer to Rust's [platform support page][platform-support-doc] for more
1762 information on Rust's tiered platform support.
1765 -----------------------
1766 - [Abort messages will now forward to `android_set_abort_message` on
1767 Android platforms when available.][81469]
1768 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1769 - [Arrays of any length now implement `IntoIterator`.][84147]
1770 Currently calling `.into_iter()` as a method on an array will
1771 return `impl Iterator<Item=&T>`, but this may change in a
1772 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1773 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1774 - [`leading_zeros`, and `trailing_zeros` are now available on all
1775 `NonZero` integer types.][84082]
1776 - [`{f32, f64}::from_str` now parse and print special values
1777 (`NaN`, `-0`) according to IEEE 754.][78618]
1778 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1779 - [Add the `BITS` associated constant to all numeric types.][82565]
1783 - [`AtomicBool::fetch_update`]
1784 - [`AtomicPtr::fetch_update`]
1785 - [`BTreeMap::retain`]
1786 - [`BTreeSet::retain`]
1787 - [`BufReader::seek_relative`]
1788 - [`DebugStruct::non_exhaustive`]
1790 - [`Duration::ZERO`]
1791 - [`Duration::is_zero`]
1792 - [`Duration::saturating_add`]
1793 - [`Duration::saturating_mul`]
1794 - [`Duration::saturating_sub`]
1795 - [`ErrorKind::Unsupported`]
1796 - [`Option::insert`]
1797 - [`Ordering::is_eq`]
1798 - [`Ordering::is_ge`]
1799 - [`Ordering::is_gt`]
1800 - [`Ordering::is_le`]
1801 - [`Ordering::is_lt`]
1802 - [`Ordering::is_ne`]
1803 - [`OsStr::is_ascii`]
1804 - [`OsStr::make_ascii_lowercase`]
1805 - [`OsStr::make_ascii_uppercase`]
1806 - [`OsStr::to_ascii_lowercase`]
1807 - [`OsStr::to_ascii_uppercase`]
1808 - [`Peekable::peek_mut`]
1809 - [`Rc::decrement_strong_count`]
1810 - [`Rc::increment_strong_count`]
1811 - [`Vec::extend_from_within`]
1812 - [`array::from_mut`]
1813 - [`array::from_ref`]
1814 - [`cmp::max_by_key`]
1816 - [`cmp::min_by_key`]
1818 - [`f32::is_subnormal`]
1819 - [`f64::is_subnormal`]
1822 -----------------------
1823 - [Cargo now supports git repositories where the default `HEAD` branch is not
1824 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1825 which can handle default branches correctly.
1826 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1827 - [The `authors` field is no longer included in `Cargo.toml` for new
1828 projects.][cargo/9282]
1831 -----------------------
1832 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1833 without hyperlinks.][81764]
1837 - [Implement token-based handling of attributes during expansion][82608]
1838 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1839 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1840 to confusion and potential security vulnerabilities and [is no
1841 longer recommended][ietf6943].
1842 - [The added `BITS` constant may conflict with external definitions.][85667]
1843 In particular, this was known to be a problem in the `lexical-core` crate,
1844 but they have published fixes for semantic versions 0.4 through 0.7. To
1845 update this dependency alone, use `cargo update -p lexical-core`.
1846 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1850 These changes provide no direct user facing benefits, but represent significant
1851 improvements to the internals and overall performance of rustc and
1854 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1855 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1856 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1857 - [Rework rustdoc const type][82873]
1859 [85667]: https://github.com/rust-lang/rust/pull/85667
1860 [83386]: https://github.com/rust-lang/rust/pull/83386
1861 [82771]: https://github.com/rust-lang/rust/pull/82771
1862 [84147]: https://github.com/rust-lang/rust/pull/84147
1863 [84082]: https://github.com/rust-lang/rust/pull/84082
1864 [83799]: https://github.com/rust-lang/rust/pull/83799
1865 [83681]: https://github.com/rust-lang/rust/pull/83681
1866 [83652]: https://github.com/rust-lang/rust/pull/83652
1867 [83387]: https://github.com/rust-lang/rust/pull/83387
1868 [82873]: https://github.com/rust-lang/rust/pull/82873
1869 [82864]: https://github.com/rust-lang/rust/pull/82864
1870 [82608]: https://github.com/rust-lang/rust/pull/82608
1871 [82565]: https://github.com/rust-lang/rust/pull/82565
1872 [80525]: https://github.com/rust-lang/rust/pull/80525
1873 [79278]: https://github.com/rust-lang/rust/pull/79278
1874 [78618]: https://github.com/rust-lang/rust/pull/78618
1875 [77704]: https://github.com/rust-lang/rust/pull/77704
1876 [83941]: https://github.com/rust-lang/rust/pull/83941
1877 [83065]: https://github.com/rust-lang/rust/pull/83065
1878 [81764]: https://github.com/rust-lang/rust/pull/81764
1879 [81469]: https://github.com/rust-lang/rust/pull/81469
1880 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1881 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1882 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1883 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1884 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1885 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1886 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1887 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1888 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1889 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1890 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1891 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1892 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1893 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1894 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1895 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1896 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1897 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1898 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1899 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1900 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1901 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1902 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1903 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1904 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1905 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1906 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1907 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1908 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1909 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1910 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1911 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1912 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1913 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1914 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1915 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1916 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1917 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1918 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1919 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1920 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1923 Version 1.52.1 (2021-05-10)
1924 ============================
1926 This release disables incremental compilation, unless the user has explicitly
1927 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1929 This is due to the widespread, and frequently occurring, breakage encountered by
1930 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1931 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1932 newly added incremental verification are still present in past stable versions,
1933 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1936 These problems only affect incremental builds, so release builds with Cargo
1937 should not be affected unless the user has explicitly opted into incremental.
1938 Debug and check builds are affected.
1940 See [84970] for more details.
1942 [84970]: https://github.com/rust-lang/rust/issues/84970
1944 Version 1.52.0 (2021-05-06)
1945 ============================
1949 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1950 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1951 is allowed by default, and may become a warning or hard error in a
1953 - [You can now cast mutable references to arrays to a pointer of the same type as
1954 the element.][81479]
1958 - [Upgraded the default LLVM to LLVM 12.][81451]
1960 Added tier 3\* support for the following targets.
1962 - [`s390x-unknown-linux-musl`][82166]
1963 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1964 - [`powerpc-unknown-openbsd`][82733]
1966 \* Refer to Rust's [platform support page][platform-support-doc] for more
1967 information on Rust's tiered platform support.
1971 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1972 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1973 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1974 - [All integer division and remainder operations are now `const`.][80962]
1978 - [`Arguments::as_str`]
1980 - [`char::REPLACEMENT_CHARACTER`]
1981 - [`char::UNICODE_VERSION`]
1982 - [`char::decode_utf16`]
1983 - [`char::from_digit`]
1984 - [`char::from_u32_unchecked`]
1985 - [`char::from_u32`]
1986 - [`slice::partition_point`]
1987 - [`str::rsplit_once`]
1988 - [`str::split_once`]
1990 The following previously stable APIs are now `const`.
1992 - [`char::len_utf8`]
1993 - [`char::len_utf16`]
1994 - [`char::to_ascii_uppercase`]
1995 - [`char::to_ascii_lowercase`]
1996 - [`char::eq_ignore_ascii_case`]
1997 - [`u8::to_ascii_uppercase`]
1998 - [`u8::to_ascii_lowercase`]
1999 - [`u8::eq_ignore_ascii_case`]
2003 - [Rustdoc lints are now treated as a tool lint, meaning that
2004 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
2005 Using the old style is still allowed, and will become a warning in
2007 - [Rustdoc now supports argument files.][82261]
2008 - [Rustdoc now generates smart punctuation for documentation.][79423]
2009 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
2017 - [You can now pass multiple filters to tests.][81356] E.g.
2018 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
2019 - [Rustup now distributes PDB symbols for the `std` library on Windows,
2020 allowing you to see `std` symbols when debugging.][82218]
2024 These changes provide no direct user facing benefits, but represent significant
2025 improvements to the internals and overall performance of rustc and
2028 - [Check the result cache before the DepGraph when ensuring queries][81855]
2029 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
2030 - [Only store a LocalDefId in some HIR nodes][81611]
2031 - [Store HIR attributes in a side table][79519]
2035 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
2036 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
2037 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
2038 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
2039 languages in code blocks.][78429]
2040 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
2041 - [Changes in how proc macros handle whitespace may lead to panics when used
2042 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
2043 - [Turn `#[derive]` into a regular macro attribute][79078]
2045 [84136]: https://github.com/rust-lang/rust/issues/84136
2046 [80763]: https://github.com/rust-lang/rust/pull/80763
2047 [82166]: https://github.com/rust-lang/rust/pull/82166
2048 [82121]: https://github.com/rust-lang/rust/pull/82121
2049 [81879]: https://github.com/rust-lang/rust/pull/81879
2050 [82261]: https://github.com/rust-lang/rust/pull/82261
2051 [82218]: https://github.com/rust-lang/rust/pull/82218
2052 [82216]: https://github.com/rust-lang/rust/pull/82216
2053 [82202]: https://github.com/rust-lang/rust/pull/82202
2054 [81855]: https://github.com/rust-lang/rust/pull/81855
2055 [81766]: https://github.com/rust-lang/rust/pull/81766
2056 [81744]: https://github.com/rust-lang/rust/pull/81744
2057 [81611]: https://github.com/rust-lang/rust/pull/81611
2058 [81479]: https://github.com/rust-lang/rust/pull/81479
2059 [81451]: https://github.com/rust-lang/rust/pull/81451
2060 [81356]: https://github.com/rust-lang/rust/pull/81356
2061 [80962]: https://github.com/rust-lang/rust/pull/80962
2062 [80553]: https://github.com/rust-lang/rust/pull/80553
2063 [80527]: https://github.com/rust-lang/rust/pull/80527
2064 [79519]: https://github.com/rust-lang/rust/pull/79519
2065 [79423]: https://github.com/rust-lang/rust/pull/79423
2066 [79208]: https://github.com/rust-lang/rust/pull/79208
2067 [78429]: https://github.com/rust-lang/rust/pull/78429
2068 [82733]: https://github.com/rust-lang/rust/pull/82733
2069 [82594]: https://github.com/rust-lang/rust/pull/82594
2070 [79078]: https://github.com/rust-lang/rust/pull/79078
2071 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
2072 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
2073 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
2074 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
2075 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
2076 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
2077 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
2078 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
2079 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
2080 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
2081 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
2082 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
2083 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
2084 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
2085 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
2086 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
2087 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
2088 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
2089 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
2090 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
2091 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
2092 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
2094 Version 1.51.0 (2021-03-25)
2095 ============================
2099 - [You can now parameterize items such as functions, traits, and `struct`s by constant
2100 values in addition to by types and lifetimes.][79135] Also known as "const generics"
2101 E.g. you can now write the following. Note: Only values of primitive integers,
2102 `bool`, or `char` types are currently permitted.
2104 struct GenericArray<T, const LENGTH: usize> {
2108 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2109 const fn last(&self) -> Option<&T> {
2113 Some(&self.inner[LENGTH - 1])
2123 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2124 This option controls whether debug information is split across multiple files
2125 or packed into a single file. **Note** This option is unstable on other platforms.
2126 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2127 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2128 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2129 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2131 \* Refer to Rust's [platform support page][platform-support-doc] for more
2132 information on Rust's tiered platform support.
2137 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2138 - [`str` now implements `AsMut<str>`.][80279]
2139 - [`u64` and `u128` now implement `From<char>`.][79502]
2140 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2141 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2142 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2143 - [`io::Empty` now implements `io::Seek`.][78044]
2144 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2145 `T: ?Sized` types.][80764]
2146 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2152 - [`Arc::decrement_strong_count`]
2153 - [`Arc::increment_strong_count`]
2154 - [`Once::call_once_force`]
2155 - [`Peekable::next_if_eq`]
2156 - [`Peekable::next_if`]
2157 - [`Seek::stream_position`]
2158 - [`array::IntoIter`]
2159 - [`panic::panic_any`]
2161 - [`ptr::addr_of_mut!`]
2162 - [`slice::fill_with`]
2163 - [`slice::split_inclusive_mut`]
2164 - [`slice::split_inclusive`]
2165 - [`slice::strip_prefix`]
2166 - [`slice::strip_suffix`]
2167 - [`str::split_inclusive`]
2168 - [`sync::OnceState`]
2170 - [`VecDeque::range`]
2171 - [`VecDeque::range_mut`]
2175 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2176 codegen option.][cargo/9112]
2177 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2178 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2179 to avoid unifying features of dependencies where that unification could be unwanted.
2180 Such as using the same dependency with a `std` feature in a build scripts and
2181 proc-macros, while using the `no-std` feature in the final binary. See the
2182 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2187 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2188 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2189 documentation.][79642]
2191 Various improvements to intra-doc links:
2193 - [You can link to non-path primitives such as `slice`.][80181]
2194 - [You can link to associated items.][74489]
2195 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2199 - [You can now pass `--include-ignored` to tests (e.g. with
2200 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2205 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2206 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2208 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2209 for the distributed artifacts.][81521]
2210 - `armv5te-unknown-linux-gnueabi`
2211 - `sparc64-unknown-linux-gnu`
2212 - `thumbv7neon-unknown-linux-gnueabihf`
2213 - `armv7-unknown-linux-gnueabi`
2214 - `x86_64-unknown-linux-gnux32`
2215 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2220 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2222 [79135]: https://github.com/rust-lang/rust/pull/79135
2223 [74489]: https://github.com/rust-lang/rust/pull/74489
2224 [76934]: https://github.com/rust-lang/rust/pull/76934
2225 [79570]: https://github.com/rust-lang/rust/pull/79570
2226 [80181]: https://github.com/rust-lang/rust/pull/80181
2227 [79642]: https://github.com/rust-lang/rust/pull/79642
2228 [80945]: https://github.com/rust-lang/rust/pull/80945
2229 [80279]: https://github.com/rust-lang/rust/pull/80279
2230 [80053]: https://github.com/rust-lang/rust/pull/80053
2231 [79502]: https://github.com/rust-lang/rust/pull/79502
2232 [75180]: https://github.com/rust-lang/rust/pull/75180
2233 [81521]: https://github.com/rust-lang/rust/pull/81521
2234 [80968]: https://github.com/rust-lang/rust/pull/80968
2235 [80959]: https://github.com/rust-lang/rust/pull/80959
2236 [80718]: https://github.com/rust-lang/rust/pull/80718
2237 [80653]: https://github.com/rust-lang/rust/pull/80653
2238 [80579]: https://github.com/rust-lang/rust/pull/80579
2239 [79998]: https://github.com/rust-lang/rust/pull/79998
2240 [78044]: https://github.com/rust-lang/rust/pull/78044
2241 [81455]: https://github.com/rust-lang/rust/pull/81455
2242 [80764]: https://github.com/rust-lang/rust/pull/80764
2243 [80749]: https://github.com/rust-lang/rust/pull/80749
2244 [80662]: https://github.com/rust-lang/rust/pull/80662
2245 [79134]: https://github.com/rust-lang/rust/pull/79134
2246 [80966]: https://github.com/rust-lang/rust/pull/80966
2247 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2248 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2249 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2250 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2251 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2252 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2253 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2254 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2255 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2256 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2257 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2258 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2259 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2260 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2261 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2262 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2263 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2264 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2265 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2266 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2267 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2268 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2269 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2271 Version 1.50.0 (2021-02-11)
2272 ============================
2275 -----------------------
2276 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2277 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2278 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2281 -----------------------
2282 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2283 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2284 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2285 - [Dropped support for all cloudabi targets.][78439]
2287 \* Refer to Rust's [platform support page][platform-support-doc] for more
2288 information on Rust's tiered platform support.
2291 -----------------------
2293 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2294 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2295 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2296 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2297 up the same amount of space as `File`.
2303 - [`btree_map::Entry::or_insert_with_key`]
2306 - [`hash_map::Entry::or_insert_with_key`]
2310 - [`UnsafeCell::get_mut`]
2312 The following previously stable methods are now `const`.
2314 - [`IpAddr::is_ipv4`]
2315 - [`IpAddr::is_ipv6`]
2316 - [`IpAddr::is_unspecified`]
2317 - [`IpAddr::is_loopback`]
2318 - [`IpAddr::is_multicast`]
2319 - [`Ipv4Addr::octets`]
2320 - [`Ipv4Addr::is_loopback`]
2321 - [`Ipv4Addr::is_private`]
2322 - [`Ipv4Addr::is_link_local`]
2323 - [`Ipv4Addr::is_multicast`]
2324 - [`Ipv4Addr::is_broadcast`]
2325 - [`Ipv4Addr::is_documentation`]
2326 - [`Ipv4Addr::to_ipv6_compatible`]
2327 - [`Ipv4Addr::to_ipv6_mapped`]
2328 - [`Ipv6Addr::segments`]
2329 - [`Ipv6Addr::is_unspecified`]
2330 - [`Ipv6Addr::is_loopback`]
2331 - [`Ipv6Addr::is_multicast`]
2332 - [`Ipv6Addr::to_ipv4`]
2335 - [`Layout::from_size_align`]
2336 - `pow` for all integer types.
2337 - `checked_pow` for all integer types.
2338 - `saturating_pow` for all integer types.
2339 - `wrapping_pow` for all integer types.
2340 - `next_power_of_two` for all unsigned integer types.
2341 - `checked_next_power_of_two` for all unsigned integer types.
2344 -----------------------
2346 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2347 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2348 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2349 contents of that directory for changes.][cargo/8973]
2350 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2355 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2356 - [Running tests will now print the total time taken to execute.][75752]
2361 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2362 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2363 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2364 unhygenic `macro_rules!` macros.][79472]
2365 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2366 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2367 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2368 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2369 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2370 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2372 [74989]: https://github.com/rust-lang/rust/pull/74989
2373 [79261]: https://github.com/rust-lang/rust/pull/79261
2374 [79896]: https://github.com/rust-lang/rust/pull/79896
2375 [79484]: https://github.com/rust-lang/rust/pull/79484
2376 [79472]: https://github.com/rust-lang/rust/pull/79472
2377 [79270]: https://github.com/rust-lang/rust/pull/79270
2378 [79003]: https://github.com/rust-lang/rust/pull/79003
2379 [78864]: https://github.com/rust-lang/rust/pull/78864
2380 [78636]: https://github.com/rust-lang/rust/pull/78636
2381 [78439]: https://github.com/rust-lang/rust/pull/78439
2382 [78343]: https://github.com/rust-lang/rust/pull/78343
2383 [78296]: https://github.com/rust-lang/rust/pull/78296
2384 [78068]: https://github.com/rust-lang/rust/pull/78068
2385 [75752]: https://github.com/rust-lang/rust/pull/75752
2386 [74699]: https://github.com/rust-lang/rust/pull/74699
2387 [78142]: https://github.com/rust-lang/rust/pull/78142
2388 [77484]: https://github.com/rust-lang/rust/pull/77484
2389 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2390 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2391 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2392 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2393 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2394 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2395 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2396 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2397 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2398 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2399 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2400 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2401 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2402 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2403 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2404 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2405 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2406 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2407 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2408 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2409 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2410 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2411 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2412 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2413 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2414 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2415 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2416 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2417 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2418 [`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
2419 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2420 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2421 [`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
2422 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2425 Version 1.49.0 (2020-12-31)
2426 ============================
2429 -----------------------
2431 - [Unions can now implement `Drop`, and you can now have a field in a union
2432 with `ManuallyDrop<T>`.][77547]
2433 - [You can now cast uninhabited enums to integers.][76199]
2434 - [You can now bind by reference and by move in patterns.][76119] This
2435 allows you to selectively borrow individual components of a type. E.g.
2443 let person = Person {
2444 name: String::from("Alice"),
2448 // `name` is moved out of person, but `age` is referenced.
2449 let Person { name, ref age } = person;
2450 println!("{} {}", name, age);
2454 -----------------------
2456 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2457 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2458 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2459 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2460 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2461 - [Output from threads spawned in tests is now captured.][78227]
2462 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2464 \* Refer to Rust's [platform support page][platform-support-doc] for more
2465 information on Rust's tiered platform support.
2468 -----------------------
2470 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2471 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2476 - [`slice::select_nth_unstable`]
2477 - [`slice::select_nth_unstable_by`]
2478 - [`slice::select_nth_unstable_by_key`]
2480 The following previously stable methods are now `const`.
2482 - [`Poll::is_ready`]
2483 - [`Poll::is_pending`]
2486 -----------------------
2487 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2488 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2489 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2490 variable will be set if the crate being built is one the user selected to build, either
2491 with `-p` or through defaults.
2492 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2498 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2499 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2500 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2501 Previously such invalid or unused attributes could be ignored.
2502 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2503 read [this post about the changes][rustdoc-ws-post] for more details.
2504 - [Trait bounds are no longer inferred for associated types.][79904]
2508 These changes provide no direct user facing benefits, but represent significant
2509 improvements to the internals and overall performance of rustc and
2512 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2513 Local Storage model.][78201]
2514 - [Calculate visibilities once in resolve.][78077]
2515 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2516 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2519 [75991]: https://github.com/rust-lang/rust/pull/75991
2520 [78951]: https://github.com/rust-lang/rust/pull/78951
2521 [78848]: https://github.com/rust-lang/rust/pull/78848
2522 [78746]: https://github.com/rust-lang/rust/pull/78746
2523 [78376]: https://github.com/rust-lang/rust/pull/78376
2524 [78228]: https://github.com/rust-lang/rust/pull/78228
2525 [78227]: https://github.com/rust-lang/rust/pull/78227
2526 [78201]: https://github.com/rust-lang/rust/pull/78201
2527 [78109]: https://github.com/rust-lang/rust/pull/78109
2528 [78077]: https://github.com/rust-lang/rust/pull/78077
2529 [77997]: https://github.com/rust-lang/rust/pull/77997
2530 [77703]: https://github.com/rust-lang/rust/pull/77703
2531 [77547]: https://github.com/rust-lang/rust/pull/77547
2532 [77015]: https://github.com/rust-lang/rust/pull/77015
2533 [76199]: https://github.com/rust-lang/rust/pull/76199
2534 [76119]: https://github.com/rust-lang/rust/pull/76119
2535 [75914]: https://github.com/rust-lang/rust/pull/75914
2536 [79004]: https://github.com/rust-lang/rust/pull/79004
2537 [78676]: https://github.com/rust-lang/rust/pull/78676
2538 [79904]: https://github.com/rust-lang/rust/issues/79904
2539 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2540 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2541 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2542 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2543 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2544 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2545 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2546 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2547 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2548 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2550 Version 1.48.0 (2020-11-19)
2551 ==========================
2556 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2557 is still rejected *semantically*, but can now be parsed by procedural macros.
2561 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2562 `rustc` whether to link its own C runtime and libraries or to rely on a external
2563 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2564 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2565 Note: If you're using cargo you must explicitly pass the `--target` flag.
2566 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2568 \* Refer to Rust's [platform support page][platform-support-doc] for more
2569 information on Rust's tiered platform support.
2573 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2574 and `&Stderr`.][76275]
2575 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2576 - [The `matches!` macro now supports having a trailing comma.][74880]
2577 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2578 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2582 - [`slice::as_ptr_range`]
2583 - [`slice::as_mut_ptr_range`]
2584 - [`VecDeque::make_contiguous`]
2585 - [`future::pending`]
2588 The following previously stable methods are now `const fn`'s:
2590 - [`Option::is_some`]
2591 - [`Option::is_none`]
2592 - [`Option::as_ref`]
2594 - [`Result::is_err`]
2595 - [`Result::as_ref`]
2596 - [`Ordering::reverse`]
2597 - [`Ordering::then`]
2604 - [You can now link to items in `rustdoc` using the intra-doc link
2605 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2606 a link to `std::future`'s documentation. See ["Linking to items by
2607 name"][intradoc-links] for more information.
2608 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2609 when searching through `rustdoc`'s UI.][75740]
2613 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2614 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2615 promoted to `'static` lifetime any more inside `const fn`s.
2616 - [Associated type bindings on trait objects are now verified to meet the bounds
2617 declared on the trait when checking that they implement the trait.][27675]
2618 - [When trait bounds on associated types or opaque types are ambiguous, the
2619 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2620 - [Fixed recursive nonterminals not being expanded in macros during
2621 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2622 correctly handling recursive nonterminal tokens.
2623 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2624 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2625 in places where they have no effect.][73461]
2626 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2627 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2628 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2629 disallow zero-initialization.][71274]
2630 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2631 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2632 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2633 see the [`catch_unwind`] documentation for further information.
2639 These changes provide no direct user facing benefits, but represent significant
2640 improvements to the internals and overall performance of rustc and
2643 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2644 You can continue building with `make` by setting `ninja=false` in
2646 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2647 - [Made `ensure_sufficient_stack()` non-generic][76680]
2649 [78143]: https://github.com/rust-lang/rust/issues/78143
2650 [76680]: https://github.com/rust-lang/rust/pull/76680/
2651 [76030]: https://github.com/rust-lang/rust/pull/76030/
2652 [70212]: https://github.com/rust-lang/rust/pull/70212/
2653 [27675]: https://github.com/rust-lang/rust/issues/27675/
2654 [54121]: https://github.com/rust-lang/rust/issues/54121/
2655 [71274]: https://github.com/rust-lang/rust/pull/71274/
2656 [77386]: https://github.com/rust-lang/rust/pull/77386/
2657 [77153]: https://github.com/rust-lang/rust/pull/77153/
2658 [77055]: https://github.com/rust-lang/rust/pull/77055/
2659 [76275]: https://github.com/rust-lang/rust/pull/76275/
2660 [76310]: https://github.com/rust-lang/rust/pull/76310/
2661 [76420]: https://github.com/rust-lang/rust/pull/76420/
2662 [76158]: https://github.com/rust-lang/rust/pull/76158/
2663 [75857]: https://github.com/rust-lang/rust/pull/75857/
2664 [75585]: https://github.com/rust-lang/rust/pull/75585/
2665 [75740]: https://github.com/rust-lang/rust/pull/75740/
2666 [75502]: https://github.com/rust-lang/rust/pull/75502/
2667 [74880]: https://github.com/rust-lang/rust/pull/74880/
2668 [74922]: https://github.com/rust-lang/rust/pull/74922/
2669 [74430]: https://github.com/rust-lang/rust/pull/74430/
2670 [74194]: https://github.com/rust-lang/rust/pull/74194/
2671 [73461]: https://github.com/rust-lang/rust/pull/73461/
2672 [73166]: https://github.com/rust-lang/rust/pull/73166/
2673 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2674 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2675 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2676 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2677 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2678 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2679 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2680 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2681 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2682 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2683 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2684 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2685 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2686 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2687 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2690 Version 1.47.0 (2020-10-08)
2691 ==========================
2695 - [Closures will now warn when not used.][74869]
2699 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2700 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2702 - [Upgraded to LLVM 11.][73526]
2703 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2704 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2705 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2707 \* Refer to Rust's [platform support page][platform-support-doc] for more
2708 information on Rust's tiered platform support.
2712 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2713 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2714 those of length less than 33.][74060]
2715 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2716 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2717 `PartialEq`, and `PartialOrd`.][73583]
2721 - [`Ident::new_raw`]
2722 - [`Range::is_empty`]
2723 - [`RangeInclusive::is_empty`]
2724 - [`Result::as_deref`]
2725 - [`Result::as_deref_mut`]
2727 - [`pointer::offset_from`]
2731 The following previously stable APIs have now been made const.
2733 - [The `new` method for all `NonZero` integers.][73858]
2734 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2735 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2736 methods for all integers.][73858]
2737 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2738 signed integers.][73858]
2739 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2740 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2741 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2742 `is_ascii_control` methods for `char` and `u8`.][73858]
2746 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2747 You can override this by setting the following in your `Cargo.toml`.
2749 [profile.release.build-override]
2752 - [`cargo-help` will now display man pages for commands rather just the
2753 `--help` text.][cargo/8456]
2754 - [`cargo-metadata` now emits a `test` field indicating if a target has
2755 tests enabled.][cargo/8478]
2756 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2757 - [`cargo-publish` will now use an alternative registry by default if it's the
2758 only registry specified in `package.publish`.][cargo/8571]
2762 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2763 type based search.][75366]
2764 - [Added the Ayu theme to rustdoc.][71237]
2768 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2769 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2770 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2771 help to preserve more span information.][73084] These changes may cause
2772 compilation errors if your macro was unhygenic or didn't correctly handle
2774 - [Moved support for the CloudABI target to tier 3.][75568]
2775 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2776 - [Added the `rustc-docs` component.][75560] This allows you to install
2777 and read the documentation for the compiler internal APIs. (Currently only
2778 available for `x86_64-unknown-linux-gnu`.)
2783 - [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.
2785 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2786 [75048]: https://github.com/rust-lang/rust/pull/75048/
2787 [74163]: https://github.com/rust-lang/rust/pull/74163/
2788 [71237]: https://github.com/rust-lang/rust/pull/71237/
2789 [74869]: https://github.com/rust-lang/rust/pull/74869/
2790 [73858]: https://github.com/rust-lang/rust/pull/73858/
2791 [75716]: https://github.com/rust-lang/rust/pull/75716/
2792 [75560]: https://github.com/rust-lang/rust/pull/75560/
2793 [75568]: https://github.com/rust-lang/rust/pull/75568/
2794 [75366]: https://github.com/rust-lang/rust/pull/75366/
2795 [75204]: https://github.com/rust-lang/rust/pull/75204/
2796 [74650]: https://github.com/rust-lang/rust/pull/74650/
2797 [74419]: https://github.com/rust-lang/rust/pull/74419/
2798 [73964]: https://github.com/rust-lang/rust/pull/73964/
2799 [74021]: https://github.com/rust-lang/rust/pull/74021/
2800 [74060]: https://github.com/rust-lang/rust/pull/74060/
2801 [73893]: https://github.com/rust-lang/rust/pull/73893/
2802 [73526]: https://github.com/rust-lang/rust/pull/73526/
2803 [73583]: https://github.com/rust-lang/rust/pull/73583/
2804 [73084]: https://github.com/rust-lang/rust/pull/73084/
2805 [73197]: https://github.com/rust-lang/rust/pull/73197/
2806 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2807 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2808 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2809 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2810 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2811 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2812 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2813 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2814 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2815 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2816 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2817 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2818 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2819 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2822 Version 1.46.0 (2020-08-27)
2823 ==========================
2827 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2828 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2829 const functions.][73862]
2830 - [The `#[track_caller]` attribute can now be added to functions to use the
2831 function's caller's location information for panic messages.][72445]
2832 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2833 `x.0.0` over `(x.0).0`.
2834 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2835 You currently can't use `mem::transmute` in constant functions.
2839 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2840 - [Enabled static "Position Independent Executables" by default
2841 for `x86_64-unknown-linux-musl`.][70740]
2845 - [`mem::forget` is now a `const fn`.][73887]
2846 - [`String` now implements `From<char>`.][73466]
2847 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2848 integer types.][73032]
2849 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2850 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2851 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2852 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2853 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2854 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2859 - [`vec::Drain::as_slice`]
2863 Added a number of new environment variables that are now available when
2864 compiling your crate.
2866 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2867 the specific binary being compiled and the name of the crate.
2868 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2869 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2873 - [The target configuration option `abi_blacklist` has been renamed
2874 to `unsupported_abis`.][74150] The old name will still continue to work.
2875 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2876 This was previously accepted but will become a hard error in a future release.
2877 - [Rustc will fail to compile if you have a struct with
2878 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2880 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2881 ensure that spans have the correct information, and may cause breakage if you
2882 were relying on receiving spans with dummy information.
2883 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2884 a legacy installer that was replaced by a MSI installer a few years ago but
2885 was still being built.
2886 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2887 - [Rustc will no longer accept overlapping trait implementations that only
2888 differ in how the lifetime was bound.][72493]
2889 - [Rustc now correctly relates the lifetime of an existential associated
2890 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2891 you to pass a shorter lifetime than expected.
2892 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2893 The library will need to be installed for `rustc` to work, even though we
2894 expect it to be already available on most systems.
2895 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2897 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2898 exact output returned by rustc's pretty printing is an unstable
2899 implementation detail: we recommend any macro relying on it to switch to a
2900 more robust parsing system.
2902 [75453]: https://github.com/rust-lang/rust/issues/75453/
2903 [74820]: https://github.com/rust-lang/rust/issues/74820/
2904 [74420]: https://github.com/rust-lang/rust/issues/74420/
2905 [74109]: https://github.com/rust-lang/rust/pull/74109/
2906 [74150]: https://github.com/rust-lang/rust/pull/74150/
2907 [73862]: https://github.com/rust-lang/rust/pull/73862/
2908 [73887]: https://github.com/rust-lang/rust/pull/73887/
2909 [73466]: https://github.com/rust-lang/rust/pull/73466/
2910 [73516]: https://github.com/rust-lang/rust/pull/73516/
2911 [73293]: https://github.com/rust-lang/rust/pull/73293/
2912 [73007]: https://github.com/rust-lang/rust/pull/73007/
2913 [73032]: https://github.com/rust-lang/rust/pull/73032/
2914 [72920]: https://github.com/rust-lang/rust/pull/72920/
2915 [72569]: https://github.com/rust-lang/rust/pull/72569/
2916 [72583]: https://github.com/rust-lang/rust/pull/72583/
2917 [72584]: https://github.com/rust-lang/rust/pull/72584/
2918 [72717]: https://github.com/rust-lang/rust/pull/72717/
2919 [72437]: https://github.com/rust-lang/rust/pull/72437/
2920 [72445]: https://github.com/rust-lang/rust/pull/72445/
2921 [72486]: https://github.com/rust-lang/rust/pull/72486/
2922 [72493]: https://github.com/rust-lang/rust/pull/72493/
2923 [72331]: https://github.com/rust-lang/rust/pull/72331/
2924 [71896]: https://github.com/rust-lang/rust/pull/71896/
2925 [71660]: https://github.com/rust-lang/rust/pull/71660/
2926 [71322]: https://github.com/rust-lang/rust/pull/71322/
2927 [70740]: https://github.com/rust-lang/rust/pull/70740/
2928 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2929 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2930 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2931 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2932 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2935 Version 1.45.2 (2020-08-03)
2936 ==========================
2938 * [Fix bindings in tuple struct patterns][74954]
2939 * [Fix track_caller integration with trait objects][74784]
2941 [74954]: https://github.com/rust-lang/rust/issues/74954
2942 [74784]: https://github.com/rust-lang/rust/issues/74784
2945 Version 1.45.1 (2020-07-30)
2946 ==========================
2948 * [Fix const propagation with references.][73613]
2949 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2950 * [Avoid spurious implicit region bound.][74509]
2951 * [Install clippy on x.py install][74457]
2953 [73613]: https://github.com/rust-lang/rust/pull/73613
2954 [73078]: https://github.com/rust-lang/rust/issues/73078
2955 [74509]: https://github.com/rust-lang/rust/pull/74509
2956 [74457]: https://github.com/rust-lang/rust/pull/74457
2959 Version 1.45.0 (2020-07-16)
2960 ==========================
2964 - [Out of range float to int conversions using `as` has been defined as a saturating
2965 conversion.][71269] This was previously undefined behaviour, but you can use the
2966 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2967 may be desirable in rare performance sensitive situations.
2968 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2969 using `u64`.][70705]
2970 - [Function like procedural macros can now be used in expression, pattern, and statement
2971 positions.][68717] This means you can now use a function-like procedural macro
2972 anywhere you can use a declarative (`macro_rules!`) macro.
2976 - [You can now override individual target features through the `target-feature`
2977 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2978 equivalent to `-C target-feature=+avx2,+fma`.
2979 - [Added the `force-unwind-tables` flag.][69984] This option allows
2980 rustc to always generate unwind tables regardless of panic strategy.
2981 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2982 to include LLVM bitcode into generated `rlib`s (this is on by default).
2983 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2984 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2985 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2986 - [Upgraded to LLVM 10.][67759]
2988 \* Refer to Rust's [platform support page][platform-support-doc] for more
2989 information on Rust's tiered platform support.
2994 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2996 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2997 - [You can now use `char` with
2998 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2999 a range of codepoints.][72413] E.g.
3000 you can now write the following;
3002 for ch in 'a'..='z' {
3006 // Prints "abcdefghijklmnopqrstuvwxyz"
3008 - [`OsString` now implements `FromStr`.][71662]
3009 - [The `saturating_neg` method has been added to all signed integer primitive
3010 types, and the `saturating_abs` method has been added for all integer
3011 primitive types.][71886]
3012 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
3013 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
3015 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
3016 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
3017 integer types.][69813]
3018 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
3019 integer types.][72324]
3020 - [The `fetch_update` method has been added to all atomic integer types.][71843]
3025 - [`BTreeMap::remove_entry`]
3027 - [`rc::Weak::as_ptr`]
3028 - [`rc::Weak::from_raw`]
3029 - [`rc::Weak::into_raw`]
3030 - [`str::strip_prefix`]
3031 - [`str::strip_suffix`]
3032 - [`sync::Weak::as_ptr`]
3033 - [`sync::Weak::from_raw`]
3034 - [`sync::Weak::into_raw`]
3035 - [`char::UNICODE_VERSION`]
3036 - [`Span::resolved_at`]
3037 - [`Span::located_at`]
3038 - [`Span::mixed_site`]
3039 - [`unix::process::CommandExt::arg0`]
3044 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
3049 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
3050 `~~outdated information~~` becomes "~~outdated information~~".
3051 - [Added an emoji to Rustdoc's deprecated API message.][72014]
3055 - [Trying to self initialize a static value (that is creating a value using
3056 itself) is unsound and now causes a compile error.][71140]
3057 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
3058 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
3059 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
3060 previously undocumented and not intended for public use. Rustdoc still provides
3061 a non-zero exit code on errors.
3062 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
3063 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
3064 flags while cargo is adding `embed-bitcode` itself. The recommended way to
3065 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
3066 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
3070 - [Make clippy a git subtree instead of a git submodule][70655]
3071 - [Unify the undo log of all snapshot types][69464]
3073 [71848]: https://github.com/rust-lang/rust/issues/71848/
3074 [73420]: https://github.com/rust-lang/rust/issues/73420/
3075 [72324]: https://github.com/rust-lang/rust/pull/72324/
3076 [71843]: https://github.com/rust-lang/rust/pull/71843/
3077 [71886]: https://github.com/rust-lang/rust/pull/71886/
3078 [72234]: https://github.com/rust-lang/rust/pull/72234/
3079 [72239]: https://github.com/rust-lang/rust/pull/72239/
3080 [72397]: https://github.com/rust-lang/rust/pull/72397/
3081 [72413]: https://github.com/rust-lang/rust/pull/72413/
3082 [72014]: https://github.com/rust-lang/rust/pull/72014/
3083 [72062]: https://github.com/rust-lang/rust/pull/72062/
3084 [72094]: https://github.com/rust-lang/rust/pull/72094/
3085 [72133]: https://github.com/rust-lang/rust/pull/72133/
3086 [67759]: https://github.com/rust-lang/rust/pull/67759/
3087 [71900]: https://github.com/rust-lang/rust/pull/71900/
3088 [71928]: https://github.com/rust-lang/rust/pull/71928/
3089 [71662]: https://github.com/rust-lang/rust/pull/71662/
3090 [71716]: https://github.com/rust-lang/rust/pull/71716/
3091 [71447]: https://github.com/rust-lang/rust/pull/71447/
3092 [71269]: https://github.com/rust-lang/rust/pull/71269/
3093 [71095]: https://github.com/rust-lang/rust/pull/71095/
3094 [71140]: https://github.com/rust-lang/rust/pull/71140/
3095 [70655]: https://github.com/rust-lang/rust/pull/70655/
3096 [70705]: https://github.com/rust-lang/rust/pull/70705/
3097 [69984]: https://github.com/rust-lang/rust/pull/69984/
3098 [69813]: https://github.com/rust-lang/rust/pull/69813/
3099 [69464]: https://github.com/rust-lang/rust/pull/69464/
3100 [68717]: https://github.com/rust-lang/rust/pull/68717/
3101 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
3102 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
3103 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
3104 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
3105 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3106 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3107 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3108 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3109 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3110 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3111 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3112 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3113 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3114 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3115 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3116 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3117 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3120 Version 1.44.1 (2020-06-18)
3121 ===========================
3123 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3124 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3125 * [Fix crashes when finding backtrace on macOS.][71397]
3126 * [Clippy applies lint levels into different files.][clippy/5356]
3128 [71397]: https://github.com/rust-lang/rust/issues/71397
3129 [73078]: https://github.com/rust-lang/rust/issues/73078
3130 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3131 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3134 Version 1.44.0 (2020-06-04)
3135 ==========================
3139 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3140 - [Added the `unused_braces` lint.][70081]
3142 **Syntax-only changes**
3144 - [Expansion-driven outline module parsing][69838]
3149 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3154 These are still rejected semantically, so you will likely receive an error but
3155 these changes can be seen and parsed by macros and conditional compilation.
3159 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3160 Additionally when in incremental mode rustc defaults to 256 codegen units.
3161 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3162 a panic is thrown.][67502]
3163 - [Added tier 3\* support for the `aarch64-unknown-none` and
3164 `aarch64-unknown-none-softfloat` targets.][68334]
3165 - [Added tier 3 support for `arm64-apple-tvos` and
3166 `x86_64-apple-tvos` targets.][68191]
3171 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3172 `vec![]` to be able to be used in `const` contexts.
3173 - [`convert::Infallible` now implements `Hash`.][70281]
3174 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3175 a `&mut OsStr`.][70048]
3176 - [Unicode 13 is now supported.][69929]
3177 - [`String` now implements `From<&mut str>`.][69661]
3178 - [`IoSlice` now implements `Copy`.][69403]
3179 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3180 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3181 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3182 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3183 integer types.][69373]
3187 - [`PathBuf::with_capacity`]
3188 - [`PathBuf::capacity`]
3189 - [`PathBuf::clear`]
3190 - [`PathBuf::reserve`]
3191 - [`PathBuf::reserve_exact`]
3192 - [`PathBuf::shrink_to_fit`]
3193 - [`f32::to_int_unchecked`]
3194 - [`f64::to_int_unchecked`]
3195 - [`Layout::align_to`]
3196 - [`Layout::pad_to_align`]
3198 - [`Layout::extend`]
3202 - [Added the `cargo tree` command which will print a tree graph of
3203 your dependencies.][cargo/8062] E.g.
3205 mdbook v0.3.2 (/Users/src/rust/mdbook)
3207 │ ├── html5ever v0.24.0
3209 │ │ │ └── cfg-if v0.1.9
3211 │ │ └── markup5ever v0.9.0
3212 │ │ ├── log v0.4.8 (*)
3214 │ │ │ └── phf_shared v0.7.24
3215 │ │ │ ├── siphasher v0.2.3
3216 │ │ │ └── unicase v1.4.2
3217 │ │ │ [build-dependencies]
3218 │ │ │ └── version_check v0.1.5
3221 You can also display dependencies on multiple versions of the same crate with
3222 `cargo tree -d` (short for `cargo tree --duplicates`).
3226 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3227 the version in the sidebar.][69494]
3231 - [Rustc now correctly generates static libraries on Windows GNU targets with
3232 the `.a` extension, rather than the previous `.lib`.][70937]
3233 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3234 - [The `file_name` property in JSON output of macro errors now points the actual
3235 source file rather than the previous format of `<NAME macros>`.][70969]
3236 **Note:** this may not point to a file that actually exists on the user's system.
3237 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3238 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3239 not allow zero initialization such as `NonZeroU8`.][66059] This was
3240 previously a warning.
3241 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3242 operator has been defined as a saturating operation.][71269] This was previously
3243 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3244 continue using the current behaviour, which may be desirable in rare performance
3245 sensitive situations.
3249 These changes provide no direct user facing benefits, but represent significant
3250 improvements to the internals and overall performance of rustc and
3253 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3254 - [Replace big JS dict with JSON parsing.][71250]
3256 [69373]: https://github.com/rust-lang/rust/pull/69373/
3257 [66059]: https://github.com/rust-lang/rust/pull/66059/
3258 [68191]: https://github.com/rust-lang/rust/pull/68191/
3259 [68899]: https://github.com/rust-lang/rust/pull/68899/
3260 [71147]: https://github.com/rust-lang/rust/pull/71147/
3261 [71250]: https://github.com/rust-lang/rust/pull/71250/
3262 [70937]: https://github.com/rust-lang/rust/pull/70937/
3263 [70969]: https://github.com/rust-lang/rust/pull/70969/
3264 [70632]: https://github.com/rust-lang/rust/pull/70632/
3265 [70281]: https://github.com/rust-lang/rust/pull/70281/
3266 [70345]: https://github.com/rust-lang/rust/pull/70345/
3267 [70048]: https://github.com/rust-lang/rust/pull/70048/
3268 [70081]: https://github.com/rust-lang/rust/pull/70081/
3269 [70156]: https://github.com/rust-lang/rust/pull/70156/
3270 [71269]: https://github.com/rust-lang/rust/pull/71269/
3271 [69838]: https://github.com/rust-lang/rust/pull/69838/
3272 [69929]: https://github.com/rust-lang/rust/pull/69929/
3273 [69661]: https://github.com/rust-lang/rust/pull/69661/
3274 [69778]: https://github.com/rust-lang/rust/pull/69778/
3275 [69494]: https://github.com/rust-lang/rust/pull/69494/
3276 [69403]: https://github.com/rust-lang/rust/pull/69403/
3277 [69033]: https://github.com/rust-lang/rust/pull/69033/
3278 [68692]: https://github.com/rust-lang/rust/pull/68692/
3279 [68334]: https://github.com/rust-lang/rust/pull/68334/
3280 [67502]: https://github.com/rust-lang/rust/pull/67502/
3281 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3282 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3283 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3284 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3285 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3286 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3287 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3288 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3289 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3290 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3291 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3292 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3293 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3296 Version 1.43.1 (2020-05-07)
3297 ===========================
3299 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3300 * [Fixed the stabilization of AVX-512 features.][71473]
3301 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3303 [71430]: https://github.com/rust-lang/rust/pull/71430
3304 [71473]: https://github.com/rust-lang/rust/issues/71473
3305 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3308 Version 1.43.0 (2020-04-23)
3309 ==========================
3313 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3314 the type inferred correctly.][68129]
3315 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3317 **Syntax only changes**
3318 - [Allow `type Foo: Ord` syntactically.][69361]
3319 - [Fuse associated and extern items up to defaultness.][69194]
3320 - [Syntactically allow `self` in all `fn` contexts.][68764]
3321 - [Merge `fn` syntax + cleanup item parsing.][68728]
3322 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3323 For example, you may now write:
3325 macro_rules! mac_trait {
3335 These are still rejected *semantically*, so you will likely receive an error but
3336 these changes can be seen and parsed by macros and
3337 conditional compilation.
3342 - [You can now pass multiple lint flags to rustc to override the previous
3343 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3344 everything in the `unused` lint group except `unused-variables` which
3345 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3346 everything in the `unused` lint group **including** `unused-variables` since
3347 the allow flag is specified before the deny flag (and therefore overridden).
3348 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3349 if they are available on `windows-gnu`.][67429]
3350 - [rustc now buffers errors/warnings printed in JSON.][69227]
3354 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3355 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3356 respectively.][69538] **Note** These conversions are only available when `N`
3358 - [You can now use associated constants on floats and integers directly, rather
3359 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3360 `f32::NAN` with no imports.
3361 - [`u8::is_ascii` is now `const`.][68984]
3362 - [`String` now implements `AsMut<str>`.][68742]
3363 - [Added the `primitive` module to `std` and `core`.][67637] This module
3364 reexports Rust's primitive types. This is mainly useful in macros
3365 where you want avoid these types being shadowed.
3366 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3367 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3371 - [`Once::is_completed`]
3376 - [`iter::once_with`]
3380 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3381 your environment.][cargo/7823]
3382 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3383 executable path when running integration tests or benchmarks.][cargo/7697]
3384 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3385 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3389 - [Certain checks in the `const_err` lint were deemed unrelated to const
3390 evaluation][69185], and have been moved to the `unconditional_panic` and
3391 `arithmetic_overflow` lints.
3396 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3397 has been a warning since 1.36.0.
3398 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3399 led to some instances being accepted, and now correctly emits a hard error.
3401 [69340]: https://github.com/rust-lang/rust/pull/69340
3405 These changes provide no direct user facing benefits, but represent significant
3406 improvements to the internals and overall performance of `rustc` and
3409 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3410 - [Improved how rustc generates drop code.][67332]
3411 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3412 - [traits: preallocate 2 Vecs of known initial size][69022]
3413 - [Avoid exponential behaviour when relating types][68772]
3414 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3415 - [Improve performance of coherence checks][68966]
3416 - [Deduplicate types in the generator witness][68672]
3417 - [Invert control in struct_lint_level.][68725]
3419 [67332]: https://github.com/rust-lang/rust/pull/67332/
3420 [67429]: https://github.com/rust-lang/rust/pull/67429/
3421 [67637]: https://github.com/rust-lang/rust/pull/67637/
3422 [67642]: https://github.com/rust-lang/rust/pull/67642/
3423 [67878]: https://github.com/rust-lang/rust/pull/67878/
3424 [67885]: https://github.com/rust-lang/rust/pull/67885/
3425 [68129]: https://github.com/rust-lang/rust/pull/68129/
3426 [68672]: https://github.com/rust-lang/rust/pull/68672/
3427 [68725]: https://github.com/rust-lang/rust/pull/68725/
3428 [68728]: https://github.com/rust-lang/rust/pull/68728/
3429 [68738]: https://github.com/rust-lang/rust/pull/68738/
3430 [68742]: https://github.com/rust-lang/rust/pull/68742/
3431 [68764]: https://github.com/rust-lang/rust/pull/68764/
3432 [68772]: https://github.com/rust-lang/rust/pull/68772/
3433 [68943]: https://github.com/rust-lang/rust/pull/68943/
3434 [68952]: https://github.com/rust-lang/rust/pull/68952/
3435 [68966]: https://github.com/rust-lang/rust/pull/68966/
3436 [68984]: https://github.com/rust-lang/rust/pull/68984/
3437 [69022]: https://github.com/rust-lang/rust/pull/69022/
3438 [69185]: https://github.com/rust-lang/rust/pull/69185/
3439 [69194]: https://github.com/rust-lang/rust/pull/69194/
3440 [69201]: https://github.com/rust-lang/rust/pull/69201/
3441 [69227]: https://github.com/rust-lang/rust/pull/69227/
3442 [69548]: https://github.com/rust-lang/rust/pull/69548/
3443 [69256]: https://github.com/rust-lang/rust/pull/69256/
3444 [69361]: https://github.com/rust-lang/rust/pull/69361/
3445 [69366]: https://github.com/rust-lang/rust/pull/69366/
3446 [69538]: https://github.com/rust-lang/rust/pull/69538/
3447 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3448 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3449 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3450 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3451 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3452 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3453 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3454 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3457 Version 1.42.0 (2020-03-12)
3458 ==========================
3462 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3464 fn foo(words: &[&str]) {
3466 ["Hello", "World", "!", ..] => println!("Hello World!"),
3467 ["Foo", "Bar", ..] => println!("Baz"),
3468 rest => println!("{:?}", rest),
3472 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3473 that you can create an enum that has the exact layout and ABI of the type
3475 - [You can now use outer attribute procedural macros on inline modules.][64273]
3476 - [There are some *syntax-only* changes:][67131]
3477 - `default` is syntactically allowed before items in `trait` definitions.
3478 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3479 leave out their bodies in favor of `;`.
3480 - Bounds on associated types in `impl`s are now syntactically allowed
3481 (e.g. `type Foo: Ord;`).
3482 - `...` (the C-variadic type) may occur syntactically directly as the type of
3483 any function parameter.
3485 These are still rejected *semantically*, so you will likely receive an error
3486 but these changes can be seen and parsed by procedural macros and
3487 conditional compilation.
3491 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3492 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3493 - [`Option::{expect,unwrap}` and
3494 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3495 pointing to the location where they were called, rather than
3496 `core`'s internals. ][67887]
3498 \* Refer to Rust's [platform support page][platform-support-doc] for more
3499 information on Rust's tiered platform support.
3503 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3504 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3505 to implement `Sized`.][67935]
3506 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3507 - [`Layout::new` is now `const`.][66254]
3508 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3513 - [`CondVar::wait_while`]
3514 - [`CondVar::wait_timeout_while`]
3516 - [`DebugMap::value`]
3517 - [`ManuallyDrop::take`]
3519 - [`ptr::slice_from_raw_parts_mut`]
3520 - [`ptr::slice_from_raw_parts`]
3524 - [You no longer need to include `extern crate proc_macro;` to be able to
3525 `use proc_macro;` in the `2018` edition.][cargo/7700]
3529 - [`Error::description` has been deprecated, and its use will now produce a
3530 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3532 [68253]: https://github.com/rust-lang/rust/pull/68253/
3533 [68348]: https://github.com/rust-lang/rust/pull/68348/
3534 [67935]: https://github.com/rust-lang/rust/pull/67935/
3535 [68339]: https://github.com/rust-lang/rust/pull/68339/
3536 [68122]: https://github.com/rust-lang/rust/pull/68122/
3537 [64273]: https://github.com/rust-lang/rust/pull/64273/
3538 [67712]: https://github.com/rust-lang/rust/pull/67712/
3539 [67887]: https://github.com/rust-lang/rust/pull/67887/
3540 [67131]: https://github.com/rust-lang/rust/pull/67131/
3541 [67233]: https://github.com/rust-lang/rust/pull/67233/
3542 [66899]: https://github.com/rust-lang/rust/pull/66899/
3543 [66919]: https://github.com/rust-lang/rust/pull/66919/
3544 [66254]: https://github.com/rust-lang/rust/pull/66254/
3545 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3546 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3547 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3548 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3549 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3550 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3551 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3552 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3553 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3556 Version 1.41.1 (2020-02-27)
3557 ===========================
3559 * [Always check types of static items][69145]
3560 * [Always check lifetime bounds of `Copy` impls][69145]
3561 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3563 [69225]: https://github.com/rust-lang/rust/issues/69225
3564 [69145]: https://github.com/rust-lang/rust/pull/69145
3567 Version 1.41.0 (2020-01-30)
3568 ===========================
3573 - [You can now pass type parameters to foreign items when implementing
3574 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3575 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3576 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3577 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3578 - [You can now use any valid identifier in a `format_args` macro.][66847]
3579 Previously identifiers starting with an underscore were not allowed.
3580 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3581 enum variants.][66183] These are still rejected semantically, but
3582 can be seen and parsed by procedural macros and conditional compilation.
3583 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3584 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3585 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3587 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3592 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3593 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3594 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3595 - [You can now pass an arguments file passing the `@path` syntax
3596 to rustc.][66172] Note that the format differs somewhat from what is
3597 found in other tooling; please see [the documentation][argfile-docs] for
3599 - [You can now provide `--extern` flag without a path, indicating that it is
3600 available from the search path or specified with an `-L` flag.][64882]
3602 \* Refer to Rust's [platform support page][platform-support-doc] for more
3603 information on Rust's tiered platform support.
3605 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3610 - [The `core::panic` module is now stable.][66771] It was already stable
3612 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3613 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3614 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3619 - [`Result::map_or`]
3620 - [`Result::map_or_else`]
3621 - [`std::rc::Weak::weak_count`]
3622 - [`std::rc::Weak::strong_count`]
3623 - [`std::sync::Weak::weak_count`]
3624 - [`std::sync::Weak::strong_count`]
3629 - [Cargo will now document all the private items for binary crates
3630 by default.][cargo/7593]
3631 - [`cargo-install` will now reinstall the package if it detects that it is out
3632 of date.][cargo/7560]
3633 - [Cargo.lock now uses a more git friendly format that should help to reduce
3634 merge conflicts.][cargo/7579]
3635 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3636 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3637 optimisation level to `2` for debug builds. You can also use
3638 `[profile.<profile>.build-override]` to override build scripts and
3644 - [You can now specify `edition` in documentation code blocks to compile the block
3645 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3646 should be compiled the 2018 edition of Rust.
3647 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3648 current theme with `--check-theme`.][54733]
3649 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3654 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3655 Apple targets.][apple-32bit-drop] This means that the source code is still
3656 available to build, but the targets are no longer being tested and release
3657 binaries for those platforms will no longer be distributed by the Rust project.
3658 Please refer to the linked blog post for more information.
3660 [54733]: https://github.com/rust-lang/rust/pull/54733/
3661 [61351]: https://github.com/rust-lang/rust/pull/61351/
3662 [62514]: https://github.com/rust-lang/rust/pull/62514/
3663 [67255]: https://github.com/rust-lang/rust/pull/67255/
3664 [66661]: https://github.com/rust-lang/rust/pull/66661/
3665 [66771]: https://github.com/rust-lang/rust/pull/66771/
3666 [66847]: https://github.com/rust-lang/rust/pull/66847/
3667 [66238]: https://github.com/rust-lang/rust/pull/66238/
3668 [66277]: https://github.com/rust-lang/rust/pull/66277/
3669 [66325]: https://github.com/rust-lang/rust/pull/66325/
3670 [66172]: https://github.com/rust-lang/rust/pull/66172/
3671 [66183]: https://github.com/rust-lang/rust/pull/66183/
3672 [65879]: https://github.com/rust-lang/rust/pull/65879/
3673 [65013]: https://github.com/rust-lang/rust/pull/65013/
3674 [64882]: https://github.com/rust-lang/rust/pull/64882/
3675 [64325]: https://github.com/rust-lang/rust/pull/64325/
3676 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3677 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3678 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3679 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3680 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3681 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3682 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3683 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3684 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3685 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3686 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3688 Version 1.40.0 (2019-12-19)
3689 ===========================
3693 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3694 `const` contexts.][65188] e.g.
3697 pub struct Point(i32, i32);
3699 const ORIGIN: Point = {
3700 let constructor = Point;
3706 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3707 indicate that there may be variants or fields added in the future.][64639]
3708 For example this requires adding a wild-card branch (`_ => {}`) to any match
3709 statements on a non-exhaustive `enum`. [(RFC 2008)]
3710 - [You can now use function-like procedural macros in `extern` blocks and in
3711 type positions.][63931] e.g. `type Generated = macro!();`
3712 - [Function-like and attribute procedural macros can now emit
3713 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3714 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3715 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3716 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3720 - [Added tier 3 support\* for the
3721 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3722 - [Added tier 3 support for the
3723 `aarch64-unknown-none-softfloat` target.][64589]
3724 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3725 `mips64el-unknown-linux-muslabi64` targets.][65843]
3727 \* Refer to Rust's [platform support page][platform-support-doc] for more
3728 information on Rust's tiered platform support.
3732 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3736 - [`BTreeMap::get_key_value`]
3737 - [`HashMap::get_key_value`]
3738 - [`Option::as_deref_mut`]
3739 - [`Option::as_deref`]
3740 - [`Option::flatten`]
3741 - [`UdpSocket::peer_addr`]
3742 - [`f32::to_be_bytes`]
3743 - [`f32::to_le_bytes`]
3744 - [`f32::to_ne_bytes`]
3745 - [`f64::to_be_bytes`]
3746 - [`f64::to_le_bytes`]
3747 - [`f64::to_ne_bytes`]
3748 - [`f32::from_be_bytes`]
3749 - [`f32::from_le_bytes`]
3750 - [`f32::from_ne_bytes`]
3751 - [`f64::from_be_bytes`]
3752 - [`f64::from_le_bytes`]
3753 - [`f64::from_ne_bytes`]
3760 - [Cargo will now always display warnings, rather than only on
3761 fresh builds.][cargo/7450]
3762 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3763 now produce an error.][cargo/7507] Previously these flags were ignored.
3764 - [You can now publish `dev-dependencies` without including
3765 a `version`.][cargo/7333]
3769 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3770 when running documentation tests with `rustdoc`.][63803]
3774 - [As previously announced, any previous NLL warnings in the 2015 edition are
3775 now hard errors.][64221]
3776 - [The `include!` macro will now warn if it failed to include the
3777 entire file.][64284] The `include!` macro unintentionally only includes the
3778 first _expression_ in a file, and this can be unintuitive. This will become
3779 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3780 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3781 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3782 or `extern` blocks now correctly emits a hard error.
3784 [65294]: https://github.com/rust-lang/rust/pull/65294/
3785 [66103]: https://github.com/rust-lang/rust/pull/66103/
3786 [65843]: https://github.com/rust-lang/rust/pull/65843/
3787 [65188]: https://github.com/rust-lang/rust/pull/65188/
3788 [65092]: https://github.com/rust-lang/rust/pull/65092/
3789 [64589]: https://github.com/rust-lang/rust/pull/64589/
3790 [64639]: https://github.com/rust-lang/rust/pull/64639/
3791 [64221]: https://github.com/rust-lang/rust/pull/64221/
3792 [64284]: https://github.com/rust-lang/rust/pull/64284/
3793 [63931]: https://github.com/rust-lang/rust/pull/63931/
3794 [64035]: https://github.com/rust-lang/rust/pull/64035/
3795 [63674]: https://github.com/rust-lang/rust/pull/63674/
3796 [63803]: https://github.com/rust-lang/rust/pull/63803/
3797 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3798 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3799 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3800 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3801 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3802 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3803 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3804 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3805 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3806 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3807 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3808 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3809 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3810 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3811 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3812 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3813 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3814 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3815 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3816 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3817 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3818 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3819 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3820 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3821 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3824 Version 1.39.0 (2019-11-07)
3825 ===========================
3829 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3830 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3831 - [You can now use certain attributes on function, closure, and function pointer
3832 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3833 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3834 attributes applied to items. e.g.
3837 #[cfg(windows)] slice: &[u16],
3838 #[cfg(not(windows))] slice: &[u8],
3843 - [You can now take shared references to bind-by-move patterns in the `if` guards
3844 of `match` arms.][63118] e.g.
3847 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3851 // ---- `nums` is bound by move.
3852 if nums.iter().sum::<u8>() == 10
3853 // ^------ `.iter()` implicitly takes a reference to `nums`.
3856 // ----------- Legal as `nums` was bound by move and so we have ownership.
3858 _ => unreachable!(),
3867 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3868 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3869 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3870 **Note** Cargo currently doesn't use this feature. Refer to
3871 [cargo#7315][cargo/7315] to track this feature's progress.
3872 - [You can now pass `--show-output` argument to test binaries to print the
3873 output of successful tests.][62600]
3876 \* Refer to Rust's [platform support page][platform-support-doc] for more
3877 information on Rust's tiered platform support.
3881 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3882 - [`LinkedList::new` is now a `const` function.][63684]
3883 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3884 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3885 now `const`.][63786]
3889 - [`Pin::into_inner`]
3890 - [`Instant::checked_duration_since`]
3891 - [`Instant::saturating_duration_since`]
3895 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3896 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3897 `--all` is now deprecated.
3901 - [You can now pass `-Clinker` to rustdoc to control the linker used
3902 for compiling doctests.][63834]
3906 - [Code that was previously accepted by the old borrow checker, but rejected by
3907 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3908 previously a warning, and will also become a hard error in the Rust 2015
3909 edition in the 1.40.0 release.
3910 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3911 run tests.][63827] This should improve performance when running a large
3913 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3914 recommended to use the `?` operator instead.
3915 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3918 [62600]: https://github.com/rust-lang/rust/pull/62600/
3919 [62672]: https://github.com/rust-lang/rust/pull/62672/
3920 [63118]: https://github.com/rust-lang/rust/pull/63118/
3921 [63209]: https://github.com/rust-lang/rust/pull/63209/
3922 [63402]: https://github.com/rust-lang/rust/pull/63402/
3923 [63565]: https://github.com/rust-lang/rust/pull/63565/
3924 [63595]: https://github.com/rust-lang/rust/pull/63595/
3925 [63684]: https://github.com/rust-lang/rust/pull/63684/
3926 [63698]: https://github.com/rust-lang/rust/pull/63698/
3927 [63770]: https://github.com/rust-lang/rust/pull/63770/
3928 [63786]: https://github.com/rust-lang/rust/pull/63786/
3929 [63827]: https://github.com/rust-lang/rust/pull/63827/
3930 [63834]: https://github.com/rust-lang/rust/pull/63834/
3931 [64010]: https://github.com/rust-lang/rust/pull/64010/
3932 [64028]: https://github.com/rust-lang/rust/pull/64028/
3933 [64334]: https://github.com/rust-lang/rust/pull/64334/
3934 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3935 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3936 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3937 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3938 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3939 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3941 Version 1.38.0 (2019-09-26)
3942 ==========================
3946 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3947 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3951 - [Added pipelined compilation support to `rustc`.][62766] This will
3952 improve compilation times in some cases. For further information please refer
3953 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3954 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3955 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3956 `x86_64-uwp-windows-msvc` targets.][60260]
3957 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3958 `armv7-unknown-linux-musleabi` targets.][63107]
3959 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3960 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3961 - [Upgraded to LLVM 9.][62592]
3963 \* Refer to Rust's [platform support page][platform-support-doc] for more
3964 information on Rust's tiered platform support.
3968 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3969 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3970 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3971 is available at `std::clone::Clone`). This also makes all built-in macros
3972 available in `std`/`core` root. e.g. `std::include_bytes!`.
3973 - [`str::Chars` now implements `Debug`.][63000]
3974 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3975 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3976 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3977 - [Added euclidean remainder and division operations (`div_euclid`,
3978 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3979 `overflowing`, and `wrapping` versions are available for all
3981 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3982 `PartialEq`.][61491]
3983 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3987 - [`<*const T>::cast`]
3988 - [`<*mut T>::cast`]
3989 - [`Duration::as_secs_f32`]
3990 - [`Duration::as_secs_f64`]
3991 - [`Duration::div_f32`]
3992 - [`Duration::div_f64`]
3993 - [`Duration::from_secs_f32`]
3994 - [`Duration::from_secs_f64`]
3995 - [`Duration::mul_f32`]
3996 - [`Duration::mul_f64`]
3997 - [`any::type_name`]
4001 - [Added pipelined compilation support to `cargo`.][cargo/7143]
4002 - [You can now pass the `--features` option multiple times to enable
4003 multiple features.][cargo/7084]
4008 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
4012 - [`rustc` will now warn about some incorrect uses of
4013 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
4017 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
4019 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
4020 issues][62896] with certain crates such as libc.
4022 [60260]: https://github.com/rust-lang/rust/pull/60260/
4023 [61457]: https://github.com/rust-lang/rust/pull/61457/
4024 [61491]: https://github.com/rust-lang/rust/pull/61491/
4025 [61884]: https://github.com/rust-lang/rust/pull/61884/
4026 [61953]: https://github.com/rust-lang/rust/pull/61953/
4027 [62042]: https://github.com/rust-lang/rust/pull/62042/
4028 [62528]: https://github.com/rust-lang/rust/pull/62528/
4029 [62583]: https://github.com/rust-lang/rust/pull/62583/
4030 [62735]: https://github.com/rust-lang/rust/pull/62735/
4031 [62766]: https://github.com/rust-lang/rust/pull/62766/
4032 [62784]: https://github.com/rust-lang/rust/pull/62784/
4033 [62592]: https://github.com/rust-lang/rust/pull/62592/
4034 [62785]: https://github.com/rust-lang/rust/issues/62785/
4035 [62814]: https://github.com/rust-lang/rust/pull/62814/
4036 [62896]: https://github.com/rust-lang/rust/issues/62896/
4037 [63000]: https://github.com/rust-lang/rust/pull/63000/
4038 [63056]: https://github.com/rust-lang/rust/pull/63056/
4039 [63107]: https://github.com/rust-lang/rust/pull/63107/
4040 [63346]: https://github.com/rust-lang/rust/pull/63346/
4041 [63421]: https://github.com/rust-lang/rust/pull/63421/
4042 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
4043 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
4044 [63048]: https://github.com/rust-lang/rust/pull/63048
4045 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4046 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4047 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
4048 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
4049 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
4050 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
4051 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
4052 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
4053 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
4054 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
4055 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
4056 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
4057 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
4059 Version 1.37.0 (2019-08-15)
4060 ==========================
4064 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
4065 [`Box`][62228], or an [array][62235] and unused.
4066 - [You can now use the `cfg` and `cfg_attr` attributes on
4067 generic parameters.][61547]
4068 - [You can now use enum variants through type alias.][61682] e.g. You can
4069 write the following:
4071 type MyOption = Option<u8>;
4073 fn increment_or_zero(x: MyOption) -> u8 {
4075 MyOption::Some(y) => y + 1,
4076 MyOption::None => 0,
4080 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
4081 `const _: u32 = 5;`.
4082 - [You can now use `#[repr(align(X)]` on enums.][61229]
4083 - [The `?` Kleene macro operator is now available in the
4084 2015 edition.][60932]
4088 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
4089 and `-C profile-use` flags.][61268] For more information on how to use profile
4090 guided optimization, please refer to the [rustc book][rustc-book-pgo].
4091 - [The `rust-lldb` wrapper script should now work again.][61827]
4095 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
4099 - [`BufReader::buffer`]
4100 - [`BufWriter::buffer`]
4101 - [`Cell::from_mut`]
4102 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
4103 - [`DoubleEndedIterator::nth_back`]
4105 - [`Wrapping::reverse_bits`]
4106 - [`i128::reverse_bits`]
4107 - [`i16::reverse_bits`]
4108 - [`i32::reverse_bits`]
4109 - [`i64::reverse_bits`]
4110 - [`i8::reverse_bits`]
4111 - [`isize::reverse_bits`]
4112 - [`slice::copy_within`]
4113 - [`u128::reverse_bits`]
4114 - [`u16::reverse_bits`]
4115 - [`u32::reverse_bits`]
4116 - [`u64::reverse_bits`]
4117 - [`u8::reverse_bits`]
4118 - [`usize::reverse_bits`]
4122 - [`Cargo.lock` files are now included by default when publishing executable crates
4123 with executables.][cargo/7026]
4124 - [You can now specify `default-run="foo"` in `[package]` to specify the
4125 default executable to use for `cargo run`.][cargo/7056]
4132 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4133 Please transition your code to using the `..=` syntax for inclusive
4135 - [Using a trait object without the `dyn` will now warn by default.][61203]
4136 Please transition your code to use `dyn Trait` for trait objects instead.
4138 [62228]: https://github.com/rust-lang/rust/pull/62228/
4139 [62235]: https://github.com/rust-lang/rust/pull/62235/
4140 [61802]: https://github.com/rust-lang/rust/pull/61802/
4141 [61827]: https://github.com/rust-lang/rust/pull/61827/
4142 [61547]: https://github.com/rust-lang/rust/pull/61547/
4143 [61682]: https://github.com/rust-lang/rust/pull/61682/
4144 [61268]: https://github.com/rust-lang/rust/pull/61268/
4145 [61342]: https://github.com/rust-lang/rust/pull/61342/
4146 [61347]: https://github.com/rust-lang/rust/pull/61347/
4147 [61100]: https://github.com/rust-lang/rust/pull/61100/
4148 [61203]: https://github.com/rust-lang/rust/pull/61203/
4149 [61229]: https://github.com/rust-lang/rust/pull/61229/
4150 [60932]: https://github.com/rust-lang/rust/pull/60932/
4151 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4152 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4153 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4154 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4155 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4156 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4157 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4158 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4159 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4160 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4161 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4162 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4163 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4164 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4165 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4166 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4167 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4168 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4169 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4170 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4171 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4172 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4173 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4176 Version 1.36.0 (2019-07-04)
4177 ==========================
4181 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4182 - [The order of traits in trait objects no longer affects the semantics of that
4183 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4184 `dyn fmt::Debug + Send`, where this was previously not the case.
4188 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4189 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4190 - [`mem::needs_drop` is now available as a const fn.][60364]
4191 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4192 - [`String` now implements `BorrowMut<str>`.][60404]
4193 - [`io::Cursor` now implements `Default`.][60234]
4194 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4195 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4196 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4197 environment has access to heap memory allocation.
4198 - [`String` now implements `From<&String>`.][59825]
4199 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4200 return a tuple of each argument when there is multiple arguments.
4201 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4206 - [`VecDeque::rotate_left`]
4207 - [`VecDeque::rotate_right`]
4208 - [`Iterator::copied`]
4210 - [`io::IoSliceMut`]
4211 - [`Read::read_vectored`]
4212 - [`Write::write_vectored`]
4213 - [`str::as_mut_ptr`]
4214 - [`mem::MaybeUninit`]
4215 - [`pointer::align_offset`]
4216 - [`future::Future`]
4218 - [`task::RawWaker`]
4219 - [`task::RawWakerVTable`]
4225 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4226 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4228 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4232 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4239 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4240 longer recommended, and will be deprecated in 1.39.0.
4242 [60318]: https://github.com/rust-lang/rust/pull/60318/
4243 [60364]: https://github.com/rust-lang/rust/pull/60364/
4244 [60370]: https://github.com/rust-lang/rust/pull/60370/
4245 [60404]: https://github.com/rust-lang/rust/pull/60404/
4246 [60234]: https://github.com/rust-lang/rust/pull/60234/
4247 [60244]: https://github.com/rust-lang/rust/pull/60244/
4248 [58623]: https://github.com/rust-lang/rust/pull/58623/
4249 [59648]: https://github.com/rust-lang/rust/pull/59648/
4250 [59675]: https://github.com/rust-lang/rust/pull/59675/
4251 [59825]: https://github.com/rust-lang/rust/pull/59825/
4252 [59826]: https://github.com/rust-lang/rust/pull/59826/
4253 [59445]: https://github.com/rust-lang/rust/pull/59445/
4254 [59114]: https://github.com/rust-lang/rust/pull/59114/
4255 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4256 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4257 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4258 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4259 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4260 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4261 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4262 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4263 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4264 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4265 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4266 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4267 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4268 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4269 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4270 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4271 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4272 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4273 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4274 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4277 Version 1.35.0 (2019-05-23)
4278 ==========================
4282 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4283 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4284 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4286 unsafe fn call_unsafe(func: unsafe fn()) {
4291 unsafe { call_unsafe(|| {}); }
4298 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4299 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4300 - [Added the `wasm32-unknown-wasi` target.][59464]
4305 - [`Thread` will now show its ID in `Debug` output.][59460]
4306 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4307 - [`alloc::System` now implements `Default`.][59451]
4308 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4310 - [`char::{ToLowercase, ToUppercase}` now
4311 implement `ExactSizeIterator`.][58778]
4312 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4313 - [Removed the `Read` trait bounds
4314 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4315 - [You can now call the `dbg!` macro without any parameters to print the file
4316 and line where it is called.][57847]
4317 - [In place ASCII case conversions are now up to 4× faster.][59283]
4318 e.g. `str::make_ascii_lowercase`
4319 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4326 - [`RefCell::replace_with`]
4327 - [`RefCell::map_split`]
4329 - [`Range::contains`]
4330 - [`RangeFrom::contains`]
4331 - [`RangeTo::contains`]
4332 - [`RangeInclusive::contains`]
4333 - [`RangeToInclusive::contains`]
4334 - [`Option::copied`]
4338 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4339 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4344 - [The Rust toolchain is now available natively for musl based distros.][58575]
4346 [59460]: https://github.com/rust-lang/rust/pull/59460/
4347 [59464]: https://github.com/rust-lang/rust/pull/59464/
4348 [59500]: https://github.com/rust-lang/rust/pull/59500/
4349 [59512]: https://github.com/rust-lang/rust/pull/59512/
4350 [59580]: https://github.com/rust-lang/rust/pull/59580/
4351 [59283]: https://github.com/rust-lang/rust/pull/59283/
4352 [59451]: https://github.com/rust-lang/rust/pull/59451/
4353 [59076]: https://github.com/rust-lang/rust/pull/59076/
4354 [58778]: https://github.com/rust-lang/rust/pull/58778/
4355 [58717]: https://github.com/rust-lang/rust/pull/58717/
4356 [58369]: https://github.com/rust-lang/rust/pull/58369/
4357 [58423]: https://github.com/rust-lang/rust/pull/58423/
4358 [58080]: https://github.com/rust-lang/rust/pull/58080/
4359 [57847]: https://github.com/rust-lang/rust/pull/57847/
4360 [58575]: https://github.com/rust-lang/rust/pull/58575
4361 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4362 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4363 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4364 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4365 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4366 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4367 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4368 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4369 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4370 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4371 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4372 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4374 Version 1.34.2 (2019-05-14)
4375 ===========================
4377 * [Destabilize the `Error::type_id` function due to a security
4378 vulnerability][60785] ([CVE-2019-12083])
4380 [60785]: https://github.com/rust-lang/rust/pull/60785
4381 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4383 Version 1.34.1 (2019-04-25)
4384 ===========================
4386 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4387 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4388 * [Fix Clippy panic when checking some macros][clippy/3805]
4390 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4391 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4392 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4394 Version 1.34.0 (2019-04-11)
4395 ==========================
4399 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4400 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4402 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4403 `#[attr{}]` procedural macros.][57367]
4404 - [You can now write `extern crate self as foo;`][57407] to import your
4405 crate's root into the extern prelude.
4410 - [You can now target `riscv64imac-unknown-none-elf` and
4411 `riscv64gc-unknown-none-elf`.][58406]
4412 - [You can now enable linker plugin LTO optimisations with
4413 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4414 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4416 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4421 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4422 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4423 the `Hash` trait to create an iterator.
4424 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4425 methods.][58421] Most notably you no longer require the `Ord` trait to create
4427 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4428 for all numeric types.][58044]
4429 - [Indexing a `str` is now generic over all types that
4430 implement `SliceIndex<str>`.][57604]
4431 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4432 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4433 produce a warning if their returning type is unused.
4434 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4435 `overflowing_pow` are now available for all numeric types.][57873] These are
4436 equivalent to methods such as `wrapping_add` for the `pow` operation.
4444 * [`Error::type_id`]
4445 * [`atomic::AtomicI16`]
4446 * [`atomic::AtomicI32`]
4447 * [`atomic::AtomicI64`]
4448 * [`atomic::AtomicI8`]
4449 * [`atomic::AtomicU16`]
4450 * [`atomic::AtomicU32`]
4451 * [`atomic::AtomicU64`]
4452 * [`atomic::AtomicU8`]
4453 * [`convert::Infallible`]
4454 * [`convert::TryFrom`]
4455 * [`convert::TryInto`]
4457 * [`iter::successors`]
4458 * [`num::NonZeroI128`]
4459 * [`num::NonZeroI16`]
4460 * [`num::NonZeroI32`]
4461 * [`num::NonZeroI64`]
4462 * [`num::NonZeroI8`]
4463 * [`num::NonZeroIsize`]
4464 * [`slice::sort_by_cached_key`]
4465 * [`str::escape_debug`]
4466 * [`str::escape_default`]
4467 * [`str::escape_unicode`]
4468 * [`str::split_ascii_whitespace`]
4471 * [`Instant::checked_add`]
4472 * [`Instant::checked_sub`]
4473 * [`SystemTime::checked_add`]
4474 * [`SystemTime::checked_sub`]
4478 - [You can now use alternative registries to crates.io.][cargo/6654]
4482 - [You can now use the `?` operator in your documentation tests without manually
4483 adding `fn main() -> Result<(), _> {}`.][56470]
4487 - [`Command::before_exec` is being replaced by the unsafe method
4488 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4489 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4490 can now use `const` functions in `static` variables.
4492 [58370]: https://github.com/rust-lang/rust/pull/58370/
4493 [58406]: https://github.com/rust-lang/rust/pull/58406/
4494 [58421]: https://github.com/rust-lang/rust/pull/58421/
4495 [58166]: https://github.com/rust-lang/rust/pull/58166/
4496 [58044]: https://github.com/rust-lang/rust/pull/58044/
4497 [58057]: https://github.com/rust-lang/rust/pull/58057/
4498 [58059]: https://github.com/rust-lang/rust/pull/58059/
4499 [57809]: https://github.com/rust-lang/rust/pull/57809/
4500 [57873]: https://github.com/rust-lang/rust/pull/57873/
4501 [57604]: https://github.com/rust-lang/rust/pull/57604/
4502 [57367]: https://github.com/rust-lang/rust/pull/57367/
4503 [57407]: https://github.com/rust-lang/rust/pull/57407/
4504 [57425]: https://github.com/rust-lang/rust/pull/57425/
4505 [57106]: https://github.com/rust-lang/rust/pull/57106/
4506 [56470]: https://github.com/rust-lang/rust/pull/56470/
4507 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4508 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4509 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4510 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4511 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4512 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4513 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4514 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4515 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4516 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4517 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4518 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4519 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4520 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4521 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4522 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4523 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4524 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4525 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4526 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4527 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4528 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4529 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4530 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4531 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4532 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4533 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4534 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4535 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4536 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4537 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4540 Version 1.33.0 (2019-02-28)
4541 ==========================
4545 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4546 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4547 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4548 E.g. You can have match statement on a `u8` that covers `0..=255` and
4549 you would no longer be required to have a `_ => unreachable!()` case.
4550 - [You can now have multiple patterns in `if let` and `while let`
4551 expressions.][57532] You can do this with the same syntax as a `match`
4561 let state = Creature::Crab("Ferris");
4563 if let Creature::Crab(name) | Creature::Person(name) = state {
4564 println!("This creature's name is: {}", name);
4568 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4569 this feature will by default produce a warning as this behaviour can be
4570 unintuitive. E.g. `if let _ = 5 {}`
4571 - [You can now use `let` bindings, assignments, expression statements,
4572 and irrefutable pattern destructuring in const functions.][57175]
4573 - [You can now call unsafe const functions.][57067] E.g.
4575 const unsafe fn foo() -> i32 { 5 }
4576 const fn bar() -> i32 {
4580 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4581 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4582 - [You can now specify a specific alignment with the `#[repr(packed)]`
4583 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4584 with an alignment of 2 bytes and a size of 6 bytes.
4585 - [You can now import an item from a module as an `_`.][56303] This allows you to
4586 import a trait's impls, and not have the name in the namespace. E.g.
4588 use std::io::Read as _;
4590 // Allowed as there is only one `Read` in the module.
4593 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4597 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4598 command line argument.][56351]
4599 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4600 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4601 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4602 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4603 information on Rust's platform support.
4604 - [Added support for the `thumbv7neon-linux-androideabi` and
4605 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4606 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4610 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4611 functions for all numeric types.][57566]
4612 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4613 are now `const` functions for all numeric types.][57105]
4614 - [The methods `is_positive` and `is_negative` are now `const` functions for
4615 all signed numeric types.][57105]
4616 - [The `get` method for all `NonZero` types is now `const`.][57167]
4617 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4618 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4619 numeric types.][57234]
4620 - [`Ipv4Addr::new` is now a `const` function][57234]
4624 - [`unix::FileExt::read_exact_at`]
4625 - [`unix::FileExt::write_all_at`]
4626 - [`Option::transpose`]
4627 - [`Result::transpose`]
4628 - [`convert::identity`]
4631 - [`marker::PhantomPinned`]
4632 - [`Vec::resize_with`]
4633 - [`VecDeque::resize_with`]
4634 - [`Duration::as_millis`]
4635 - [`Duration::as_micros`]
4636 - [`Duration::as_nanos`]
4641 - [You can now publish crates that require a feature flag to compile with
4642 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4643 - [Cargo should now rebuild a crate if a file was modified during the initial
4648 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4649 are now deprecated in the standard library, and their usage will now produce a warning.
4650 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4652 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4654 - [Libtest no longer creates a new thread for each test when
4655 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4657 [56243]: https://github.com/rust-lang/rust/pull/56243
4658 [56303]: https://github.com/rust-lang/rust/pull/56303/
4659 [56351]: https://github.com/rust-lang/rust/pull/56351/
4660 [56362]: https://github.com/rust-lang/rust/pull/56362
4661 [56642]: https://github.com/rust-lang/rust/pull/56642/
4662 [56769]: https://github.com/rust-lang/rust/pull/56769/
4663 [56805]: https://github.com/rust-lang/rust/pull/56805
4664 [56947]: https://github.com/rust-lang/rust/pull/56947/
4665 [57049]: https://github.com/rust-lang/rust/pull/57049/
4666 [57067]: https://github.com/rust-lang/rust/pull/57067/
4667 [57105]: https://github.com/rust-lang/rust/pull/57105
4668 [57130]: https://github.com/rust-lang/rust/pull/57130/
4669 [57167]: https://github.com/rust-lang/rust/pull/57167/
4670 [57175]: https://github.com/rust-lang/rust/pull/57175/
4671 [57234]: https://github.com/rust-lang/rust/pull/57234/
4672 [57332]: https://github.com/rust-lang/rust/pull/57332/
4673 [57465]: https://github.com/rust-lang/rust/pull/57465/
4674 [57532]: https://github.com/rust-lang/rust/pull/57532/
4675 [57535]: https://github.com/rust-lang/rust/pull/57535/
4676 [57566]: https://github.com/rust-lang/rust/pull/57566/
4677 [57615]: https://github.com/rust-lang/rust/pull/57615/
4678 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4679 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4680 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4681 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4682 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4683 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4684 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4685 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4686 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4687 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4688 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4689 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4690 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4691 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4692 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4693 [platform-support]: https://forge.rust-lang.org/platform-support.html
4695 Version 1.32.0 (2019-01-17)
4696 ==========================
4701 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4702 operator allows you to specify zero or one repetitions similar to the `*` and
4704 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4705 now always resolve to the item (`enum`, `struct`, etc.) available in the
4706 module if present, before resolving to a external crate or an item the prelude.][56759]
4709 enum Color { Red, Green, Blue }
4715 - [You can now match against `PhantomData<T>` types.][55837]
4716 - [You can now match against literals in macros with the `literal`
4717 specifier.][56072] This will match against a literal of any type.
4718 E.g. `1`, `'A'`, `"Hello World"`
4719 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4721 struct Point(i32, i32);
4724 pub fn new(x: i32, y: i32) -> Self {
4728 pub fn is_origin(&self) -> bool {
4736 - [Self can also now be used in type definitions.][56366] E.g.
4740 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4743 Cons(T, Box<Self>) // likewise here
4746 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4747 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4751 - [The default allocator has changed from jemalloc to the default allocator on
4752 your system.][55238] The compiler itself on Linux & macOS will still use
4753 jemalloc, but programs compiled with it will use the system allocator.
4754 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4758 - [`PathBuf` now implements `FromStr`.][55148]
4759 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4760 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4761 easily debug expressions in your rust program. E.g.
4764 let b = dbg!(a * 2) + 1;
4765 // ^-- prints: [src/main.rs:4] a * 2 = 4
4769 The following APIs are now `const` functions and can be used in a
4773 - [`UnsafeCell::get`]
4774 - [`char::is_ascii`]
4776 - [`ManuallyDrop::new`]
4777 - [`ManuallyDrop::into_inner`]
4778 - [`RangeInclusive::start`]
4779 - [`RangeInclusive::end`]
4780 - [`NonNull::as_ptr`]
4783 - [`Duration::as_secs`]
4784 - [`Duration::subsec_millis`]
4785 - [`Duration::subsec_micros`]
4786 - [`Duration::subsec_nanos`]
4788 - [`Ipv4Addr::is_unspecified`]
4790 - [`Ipv6Addr::octets`]
4794 - [`i8::to_be_bytes`]
4795 - [`i8::to_le_bytes`]
4796 - [`i8::to_ne_bytes`]
4797 - [`i8::from_be_bytes`]
4798 - [`i8::from_le_bytes`]
4799 - [`i8::from_ne_bytes`]
4800 - [`i16::to_be_bytes`]
4801 - [`i16::to_le_bytes`]
4802 - [`i16::to_ne_bytes`]
4803 - [`i16::from_be_bytes`]
4804 - [`i16::from_le_bytes`]
4805 - [`i16::from_ne_bytes`]
4806 - [`i32::to_be_bytes`]
4807 - [`i32::to_le_bytes`]
4808 - [`i32::to_ne_bytes`]
4809 - [`i32::from_be_bytes`]
4810 - [`i32::from_le_bytes`]
4811 - [`i32::from_ne_bytes`]
4812 - [`i64::to_be_bytes`]
4813 - [`i64::to_le_bytes`]
4814 - [`i64::to_ne_bytes`]
4815 - [`i64::from_be_bytes`]
4816 - [`i64::from_le_bytes`]
4817 - [`i64::from_ne_bytes`]
4818 - [`i128::to_be_bytes`]
4819 - [`i128::to_le_bytes`]
4820 - [`i128::to_ne_bytes`]
4821 - [`i128::from_be_bytes`]
4822 - [`i128::from_le_bytes`]
4823 - [`i128::from_ne_bytes`]
4824 - [`isize::to_be_bytes`]
4825 - [`isize::to_le_bytes`]
4826 - [`isize::to_ne_bytes`]
4827 - [`isize::from_be_bytes`]
4828 - [`isize::from_le_bytes`]
4829 - [`isize::from_ne_bytes`]
4830 - [`u8::to_be_bytes`]
4831 - [`u8::to_le_bytes`]
4832 - [`u8::to_ne_bytes`]
4833 - [`u8::from_be_bytes`]
4834 - [`u8::from_le_bytes`]
4835 - [`u8::from_ne_bytes`]
4836 - [`u16::to_be_bytes`]
4837 - [`u16::to_le_bytes`]
4838 - [`u16::to_ne_bytes`]
4839 - [`u16::from_be_bytes`]
4840 - [`u16::from_le_bytes`]
4841 - [`u16::from_ne_bytes`]
4842 - [`u32::to_be_bytes`]
4843 - [`u32::to_le_bytes`]
4844 - [`u32::to_ne_bytes`]
4845 - [`u32::from_be_bytes`]
4846 - [`u32::from_le_bytes`]
4847 - [`u32::from_ne_bytes`]
4848 - [`u64::to_be_bytes`]
4849 - [`u64::to_le_bytes`]
4850 - [`u64::to_ne_bytes`]
4851 - [`u64::from_be_bytes`]
4852 - [`u64::from_le_bytes`]
4853 - [`u64::from_ne_bytes`]
4854 - [`u128::to_be_bytes`]
4855 - [`u128::to_le_bytes`]
4856 - [`u128::to_ne_bytes`]
4857 - [`u128::from_be_bytes`]
4858 - [`u128::from_le_bytes`]
4859 - [`u128::from_ne_bytes`]
4860 - [`usize::to_be_bytes`]
4861 - [`usize::to_le_bytes`]
4862 - [`usize::to_ne_bytes`]
4863 - [`usize::from_be_bytes`]
4864 - [`usize::from_le_bytes`]
4865 - [`usize::from_ne_bytes`]
4869 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4870 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4874 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4878 - [The argument types for AVX's
4879 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4880 been changed from `*const` to `*mut` as the previous implementation
4884 [55148]: https://github.com/rust-lang/rust/pull/55148/
4885 [55238]: https://github.com/rust-lang/rust/pull/55238/
4886 [55280]: https://github.com/rust-lang/rust/pull/55280/
4887 [55610]: https://github.com/rust-lang/rust/pull/55610/
4888 [55663]: https://github.com/rust-lang/rust/pull/55663/
4889 [55702]: https://github.com/rust-lang/rust/pull/55702/
4890 [55837]: https://github.com/rust-lang/rust/pull/55837/
4891 [55843]: https://github.com/rust-lang/rust/pull/55843/
4892 [56072]: https://github.com/rust-lang/rust/pull/56072/
4893 [56245]: https://github.com/rust-lang/rust/pull/56245/
4894 [56365]: https://github.com/rust-lang/rust/pull/56365/
4895 [56366]: https://github.com/rust-lang/rust/pull/56366/
4896 [56395]: https://github.com/rust-lang/rust/pull/56395/
4897 [56759]: https://github.com/rust-lang/rust/pull/56759/
4898 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4899 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4900 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4901 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4902 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4903 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4904 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4905 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4906 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4907 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4908 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4909 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4910 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4911 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4912 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4913 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4914 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4915 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4916 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4917 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4918 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4919 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4920 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4921 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4922 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4923 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4924 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4925 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4926 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4927 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4928 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4929 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4930 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4931 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4932 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4933 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4934 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4935 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4936 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4937 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4938 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4939 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4940 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4941 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4942 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4943 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4944 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4945 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4946 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4947 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4948 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4949 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4950 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4951 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4952 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4953 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4954 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4955 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4956 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4957 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4958 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4959 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4960 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4961 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4962 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4963 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4964 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4965 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4966 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4967 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4968 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4969 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4970 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4971 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4972 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4973 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4974 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4975 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4976 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4977 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4978 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4979 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4980 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4981 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4982 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4983 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4984 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4985 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4986 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4987 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4988 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4989 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4990 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4993 Version 1.31.1 (2018-12-20)
4994 ===========================
4996 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4997 - [Fix broken go-to-definition in RLS][rls/1171]
4998 - [Fix infinite loop on hover in RLS][rls/1170]
5000 [56562]: https://github.com/rust-lang/rust/pull/56562
5001 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
5002 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
5004 Version 1.31.0 (2018-12-06)
5005 ==========================
5009 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
5010 - [New lifetime elision rules now allow for eliding lifetimes in functions and
5011 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
5012 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
5014 - [You can now define and use `const` functions.][54835] These are currently
5015 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
5016 [language reference][const-reference] for what exactly is available.
5017 - [You can now use tool lints, which allow you to scope lints from external
5018 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
5019 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
5020 a crate, not just in exported functions.][54451]
5021 - [You can now use parentheses in pattern matches.][54497]
5025 - [Updated musl to 1.1.20][54430]
5029 - [You can now convert `num::NonZero*` types to their raw equivalents using the
5030 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
5031 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
5032 into `Option<&mut T>` using the `From` trait.][53218]
5033 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
5038 - [`slice::align_to`]
5039 - [`slice::align_to_mut`]
5040 - [`slice::chunks_exact`]
5041 - [`slice::chunks_exact_mut`]
5042 - [`slice::rchunks`]
5043 - [`slice::rchunks_mut`]
5044 - [`slice::rchunks_exact`]
5045 - [`slice::rchunks_exact_mut`]
5046 - [`Option::replace`]
5050 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
5051 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
5052 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
5054 [52813]: https://github.com/rust-lang/rust/pull/52813/
5055 [53218]: https://github.com/rust-lang/rust/pull/53218/
5056 [54057]: https://github.com/rust-lang/rust/pull/54057/
5057 [54240]: https://github.com/rust-lang/rust/pull/54240/
5058 [54430]: https://github.com/rust-lang/rust/pull/54430/
5059 [54451]: https://github.com/rust-lang/rust/pull/54451/
5060 [54497]: https://github.com/rust-lang/rust/pull/54497/
5061 [54778]: https://github.com/rust-lang/rust/pull/54778/
5062 [54835]: https://github.com/rust-lang/rust/pull/54835/
5063 [54870]: https://github.com/rust-lang/rust/pull/54870/
5064 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
5065 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
5066 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
5067 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
5068 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
5069 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
5070 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5071 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
5072 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5073 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
5074 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
5075 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
5076 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
5077 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
5079 Version 1.30.1 (2018-11-08)
5080 ===========================
5082 - [Fixed overflow ICE in rustdoc][54199]
5083 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
5085 [54199]: https://github.com/rust-lang/rust/pull/54199
5086 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
5088 Version 1.30.0 (2018-10-25)
5089 ==========================
5093 - [Procedural macros are now available.][52081] These kinds of macros allow for
5094 more powerful code generation. There is a [new chapter available][proc-macros]
5095 in the Rust Programming Language book that goes further in depth.
5096 - [You can now use keywords as identifiers using the raw identifiers
5097 syntax (`r#`),][53236] e.g. `let r#for = true;`
5098 - [Using anonymous parameters in traits is now deprecated with a warning and
5099 will be a hard error in the 2018 edition.][53272]
5100 - [You can now use `crate` in paths.][54404] This allows you to refer to the
5101 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
5102 - [Using a external crate no longer requires being prefixed with `::`.][54404]
5103 Previously, using a external crate in a module without a use statement
5104 required `let json = ::serde_json::from_str(foo);` but can now be written
5105 as `let json = serde_json::from_str(foo);`.
5106 - [You can now apply the `#[used]` attribute to static items to prevent the
5107 compiler from optimising them away, even if they appear to be unused,][51363]
5108 e.g. `#[used] static FOO: u32 = 1;`
5109 - [You can now import and reexport macros from other crates with the `use`
5110 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5111 the root module of the crate. If your macro relies on calling other local
5112 macros, it is recommended to export with the
5113 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5115 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5116 using the `vis` specifier.][53370]
5117 - [Non-macro attributes now allow all forms of literals, not just
5118 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5119 write `#[attr(true)]`.
5120 - [You can now specify a function to handle a panic in the Rust runtime with the
5121 `#[panic_handler]` attribute.][51366]
5125 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5126 - [Added the `aarch64-unknown-netbsd` target][53165]
5127 - [Upgraded to LLVM 8.][53611]
5131 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5135 - [`Ipv4Addr::BROADCAST`]
5136 - [`Ipv4Addr::LOCALHOST`]
5137 - [`Ipv4Addr::UNSPECIFIED`]
5138 - [`Ipv6Addr::LOCALHOST`]
5139 - [`Ipv6Addr::UNSPECIFIED`]
5140 - [`Iterator::find_map`]
5142 The following methods are replacement methods for `trim_left`, `trim_right`,
5143 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5145 - [`str::trim_end_matches`]
5147 - [`str::trim_start_matches`]
5148 - [`str::trim_start`]
5152 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5153 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5154 equivalent to calling `rustdoc --error-format=json`.
5155 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5159 - [`rustdoc` allows you to specify what edition to treat your code as with the
5160 `--edition` option.][54057]
5161 - [`rustdoc` now has the `--color` (specify whether to output color) and
5162 `--error-format` (specify error format, e.g. `json`) options.][53003]
5163 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5164 debug symbols.][53774]
5165 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5166 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5168 [50911]: https://github.com/rust-lang/rust/pull/50911/
5169 [51363]: https://github.com/rust-lang/rust/pull/51363/
5170 [51366]: https://github.com/rust-lang/rust/pull/51366/
5171 [52081]: https://github.com/rust-lang/rust/pull/52081/
5172 [53003]: https://github.com/rust-lang/rust/pull/53003/
5173 [53033]: https://github.com/rust-lang/rust/pull/53033/
5174 [53044]: https://github.com/rust-lang/rust/pull/53044/
5175 [53165]: https://github.com/rust-lang/rust/pull/53165/
5176 [53611]: https://github.com/rust-lang/rust/pull/53611/
5177 [53236]: https://github.com/rust-lang/rust/pull/53236/
5178 [53272]: https://github.com/rust-lang/rust/pull/53272/
5179 [53370]: https://github.com/rust-lang/rust/pull/53370/
5180 [53459]: https://github.com/rust-lang/rust/pull/53459/
5181 [53774]: https://github.com/rust-lang/rust/pull/53774/
5182 [53822]: https://github.com/rust-lang/rust/pull/53822/
5183 [54057]: https://github.com/rust-lang/rust/pull/54057/
5184 [54404]: https://github.com/rust-lang/rust/pull/54404/
5185 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5186 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5187 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5188 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5190 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5191 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5192 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5193 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5194 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5195 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5196 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5197 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5198 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5199 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5202 Version 1.29.2 (2018-10-11)
5203 ===========================
5205 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5206 - The `rls-preview` component on the windows-gnu targets has been restored.
5208 [54639]: https://github.com/rust-lang/rust/pull/54639
5211 Version 1.29.1 (2018-09-25)
5212 ===========================
5217 - The standard library's `str::repeat` function contained an out of bounds write
5218 caused by an integer overflow. This has been fixed by deterministically
5219 panicking when an overflow happens.
5221 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5225 Version 1.29.0 (2018-09-13)
5226 ==========================
5230 - [Bumped minimum LLVM version to 5.0.][51899]
5231 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5232 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5233 - [Upgraded to LLVM 7.][51966]
5237 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5238 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5239 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5240 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5242 - [`Cell<T>` now allows `T` to be unsized.][50494]
5243 - [`SocketAddr` is now stable on Redox.][52656]
5248 - [`Iterator::flatten`]
5253 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5254 `--locked` to disable this behavior.
5255 - [`cargo-install` will now allow you to cross compile an install
5256 using `--target`.][cargo/5614]
5257 - [Added the `cargo-fix` subcommand to automatically move project code from
5258 2015 edition to 2018.][cargo/5723]
5259 - [`cargo doc` can now optionally document private types using the
5260 `--document-private-items` flag.][cargo/5543]
5264 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5265 the specified level to that level.][52354] For example `--cap-lints warn`
5266 will demote `deny` and `forbid` lints to `warn`.
5267 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5268 fails and `101` if there is a panic.][52197]
5269 - [A preview of clippy has been made available through rustup.][51122]
5270 You can install the preview with `rustup component add clippy-preview`.
5274 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5275 Use `str::get_unchecked(begin..end)` instead.
5276 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5277 Consider using the `home_dir` function from
5278 https://crates.io/crates/dirs instead.
5279 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5280 - [`cfg` attributes and `--cfg` command line flags are now more
5281 strictly validated.][53893]
5283 [53893]: https://github.com/rust-lang/rust/pull/53893/
5284 [52861]: https://github.com/rust-lang/rust/pull/52861/
5285 [51966]: https://github.com/rust-lang/rust/pull/51966/
5286 [52656]: https://github.com/rust-lang/rust/pull/52656/
5287 [52239]: https://github.com/rust-lang/rust/pull/52239/
5288 [52330]: https://github.com/rust-lang/rust/pull/52330/
5289 [52354]: https://github.com/rust-lang/rust/pull/52354/
5290 [52402]: https://github.com/rust-lang/rust/pull/52402/
5291 [52197]: https://github.com/rust-lang/rust/pull/52197/
5292 [51807]: https://github.com/rust-lang/rust/pull/51807/
5293 [51899]: https://github.com/rust-lang/rust/pull/51899/
5294 [51912]: https://github.com/rust-lang/rust/pull/51912/
5295 [51619]: https://github.com/rust-lang/rust/pull/51619/
5296 [51656]: https://github.com/rust-lang/rust/pull/51656/
5297 [51178]: https://github.com/rust-lang/rust/pull/51178/
5298 [51122]: https://github.com/rust-lang/rust/pull/51122
5299 [50494]: https://github.com/rust-lang/rust/pull/50494/
5300 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5301 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5302 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5303 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5304 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5305 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5306 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5309 Version 1.28.0 (2018-08-02)
5310 ===========================
5314 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5315 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5316 the inner type across Foreign Function Interface (FFI) boundaries.
5317 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5318 and can now be used as identifiers.][51196]
5319 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5320 stable.][51241] This will allow users to specify a global allocator for
5322 - [Unit test functions marked with the `#[test]` attribute can now return
5323 `Result<(), E: Debug>` in addition to `()`.][51298]
5324 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5325 allows macros to easily target lifetimes.
5329 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5330 prioritise making smaller binary sizes. `z` is the same as `s` with the
5331 exception that it does not vectorise loops, which typically results in an even
5333 - [The short error format is now stable.][49546] Specified with
5334 `--error-format=short` this option will provide a more compressed output of
5335 rust error messages.
5336 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5337 - [Reduced the number of allocations in the macro parser.][50855] This can
5338 improve compile times of macro heavy crates on average by 5%.
5342 - [Implemented `Default` for `&mut str`.][51306]
5343 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5344 - [Implemented `Extend` for `()`.][50234]
5345 - [The `Debug` implementation of `time::Duration` should now be more easily
5346 human readable.][50364] Previously a `Duration` of one second would printed as
5347 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5348 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5349 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5350 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5351 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5352 for `PathBuf`.][50170]
5353 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5354 and `Wrapping<i128>`.][50465]
5355 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5356 possible.][51050] This can provide up to a 40% speed increase.
5357 - [Improved error messages when using `format!`.][50610]
5361 - [`Iterator::step_by`]
5362 - [`Path::ancestors`]
5363 - [`SystemTime::UNIX_EPOCH`]
5364 - [`alloc::GlobalAlloc`]
5366 - [`alloc::LayoutErr`]
5369 - [`alloc::alloc_zeroed`]
5370 - [`alloc::dealloc`]
5371 - [`alloc::realloc`]
5372 - [`alloc::handle_alloc_error`]
5373 - [`btree_map::Entry::or_default`]
5374 - [`fmt::Alignment`]
5375 - [`hash_map::Entry::or_default`]
5376 - [`iter::repeat_with`]
5377 - [`num::NonZeroUsize`]
5378 - [`num::NonZeroU128`]
5379 - [`num::NonZeroU16`]
5380 - [`num::NonZeroU32`]
5381 - [`num::NonZeroU64`]
5382 - [`num::NonZeroU8`]
5383 - [`ops::RangeBounds`]
5384 - [`slice::SliceIndex`]
5385 - [`slice::from_mut`]
5386 - [`slice::from_ref`]
5387 - [`{Any + Send + Sync}::downcast_mut`]
5388 - [`{Any + Send + Sync}::downcast_ref`]
5389 - [`{Any + Send + Sync}::is`]
5393 - [Cargo will now no longer allow you to publish crates with build scripts that
5394 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5395 considered to be immutable.
5399 - [The `suggestion_applicability` field in `rustc`'s json output is now
5400 stable.][50486] This will allow dev tools to check whether a code suggestion
5401 would apply to them.
5405 - [Rust will consider trait objects with duplicated constraints to be the same
5406 type as without the duplicated constraint.][51276] For example the below code will
5407 now fail to compile.
5412 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5415 impl Trait + Send + Send {
5416 fn test(&self) { println!("two"); }
5420 [49546]: https://github.com/rust-lang/rust/pull/49546/
5421 [50143]: https://github.com/rust-lang/rust/pull/50143/
5422 [50170]: https://github.com/rust-lang/rust/pull/50170/
5423 [50234]: https://github.com/rust-lang/rust/pull/50234/
5424 [50265]: https://github.com/rust-lang/rust/pull/50265/
5425 [50364]: https://github.com/rust-lang/rust/pull/50364/
5426 [50385]: https://github.com/rust-lang/rust/pull/50385/
5427 [50465]: https://github.com/rust-lang/rust/pull/50465/
5428 [50486]: https://github.com/rust-lang/rust/pull/50486/
5429 [50554]: https://github.com/rust-lang/rust/pull/50554/
5430 [50610]: https://github.com/rust-lang/rust/pull/50610/
5431 [50855]: https://github.com/rust-lang/rust/pull/50855/
5432 [51050]: https://github.com/rust-lang/rust/pull/51050/
5433 [51196]: https://github.com/rust-lang/rust/pull/51196/
5434 [51241]: https://github.com/rust-lang/rust/pull/51241/
5435 [51276]: https://github.com/rust-lang/rust/pull/51276/
5436 [51298]: https://github.com/rust-lang/rust/pull/51298/
5437 [51306]: https://github.com/rust-lang/rust/pull/51306/
5438 [51562]: https://github.com/rust-lang/rust/pull/51562/
5439 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5440 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5441 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5442 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5443 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5444 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5445 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5446 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5447 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5448 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5449 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5450 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5451 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5452 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5453 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5454 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5455 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5456 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5457 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5458 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5459 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5460 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5461 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5462 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5463 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5464 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5465 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5466 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5467 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5468 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5470 Version 1.27.2 (2018-07-20)
5471 ===========================
5476 - The borrow checker was fixed to avoid potential unsoundness when using
5477 match ergonomics: [#52213][52213].
5479 [52213]: https://github.com/rust-lang/rust/issues/52213
5481 Version 1.27.1 (2018-07-10)
5482 ===========================
5487 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5488 when running, which enabled executing code as some other user on a
5489 given machine. This release fixes that vulnerability; you can read
5490 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5492 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5497 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5498 match ergonomics: [#51415][51415], [#49534][49534].
5500 [51415]: https://github.com/rust-lang/rust/issues/51415
5501 [49534]: https://github.com/rust-lang/rust/issues/49534
5502 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5503 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5505 Version 1.27.0 (2018-06-21)
5506 ==========================
5510 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5511 be used as an identifier.
5512 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5513 bare `Trait` syntax, and should make it clearer when being used in tandem with
5514 `impl Trait` because it is equivalent to the following syntax:
5515 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5516 `Box<Trait> == Box<dyn Trait>`.
5517 - [Attributes on generic parameters such as types and lifetimes are
5518 now stable.][48851] e.g.
5519 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5520 - [The `#[must_use]` attribute can now also be used on functions as well as
5521 types.][48925] It provides a lint that by default warns users when the
5522 value returned by a function has not been used.
5526 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5530 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5531 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5532 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5533 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5534 the `cfg` attribute.
5535 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5536 std are now available in core.][49896]
5537 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5539 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5540 that the operation isn't done in place.
5541 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5542 the `#[must_use]` attribute][49533] to warn about unused potentially
5543 expensive allocations.
5547 - [`DoubleEndedIterator::rfind`]
5548 - [`DoubleEndedIterator::rfold`]
5549 - [`DoubleEndedIterator::try_rfold`]
5550 - [`Duration::from_micros`]
5551 - [`Duration::from_nanos`]
5552 - [`Duration::subsec_micros`]
5553 - [`Duration::subsec_millis`]
5554 - [`HashMap::remove_entry`]
5555 - [`Iterator::try_fold`]
5556 - [`Iterator::try_for_each`]
5558 - [`Option::filter`]
5559 - [`String::replace_range`]
5560 - [`Take::set_limit`]
5561 - [`hint::unreachable_unchecked`]
5562 - [`os::unix::process::parent_id`]
5563 - [`ptr::swap_nonoverlapping`]
5564 - [`slice::rsplit_mut`]
5566 - [`slice::swap_with_slice`]
5570 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5571 `readme`, and `repository` fields.][cargo/5386]
5572 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5573 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5574 a different directory than `target` for placing compilation artifacts.
5575 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5576 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5577 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5578 where cargo would infer a binary, Cargo will produce a warning. You can
5579 disable this feature ahead of time by setting any of the following to false:
5580 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5581 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5582 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5586 - [Added “The Rustc book” into the official documentation.][49707]
5587 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5588 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5592 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5593 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5594 compile, `"".is_empty()` will still compile.
5595 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5596 will only print the inner type.][48553] E.g.
5597 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5598 not `AtomicBool(true)`.
5599 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5600 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5601 alignment should cover all use cases.
5602 - The `.description()` method on the `std::error::Error` trait
5603 [has been soft-deprecated][50163]. It is no longer required to implement it.
5605 [48553]: https://github.com/rust-lang/rust/pull/48553/
5606 [48851]: https://github.com/rust-lang/rust/pull/48851/
5607 [48925]: https://github.com/rust-lang/rust/pull/48925/
5608 [49533]: https://github.com/rust-lang/rust/pull/49533/
5609 [49623]: https://github.com/rust-lang/rust/pull/49623/
5610 [49630]: https://github.com/rust-lang/rust/pull/49630/
5611 [49664]: https://github.com/rust-lang/rust/pull/49664/
5612 [49699]: https://github.com/rust-lang/rust/pull/49699/
5613 [49707]: https://github.com/rust-lang/rust/pull/49707/
5614 [49896]: https://github.com/rust-lang/rust/pull/49896/
5615 [49968]: https://github.com/rust-lang/rust/pull/49968/
5616 [50163]: https://github.com/rust-lang/rust/pull/50163
5617 [50177]: https://github.com/rust-lang/rust/pull/50177/
5618 [50378]: https://github.com/rust-lang/rust/pull/50378/
5619 [50423]: https://github.com/rust-lang/rust/pull/50423/
5620 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5621 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5622 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5623 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5624 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5625 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5626 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5627 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5628 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5629 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5630 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5631 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5632 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5633 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5634 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5635 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5636 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5637 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5638 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5639 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5640 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5641 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5642 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5643 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5644 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5645 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5646 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5647 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5648 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5651 Version 1.26.2 (2018-06-05)
5652 ==========================
5657 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5659 [51117]: https://github.com/rust-lang/rust/issues/51117
5662 Version 1.26.1 (2018-05-29)
5663 ==========================
5668 - [RLS now works on Windows.][50646]
5669 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5675 - [`fn main() -> impl Trait` no longer works for non-Termination
5677 This reverts an accidental stabilization.
5678 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5679 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5681 [50646]: https://github.com/rust-lang/rust/issues/50646
5682 [50656]: https://github.com/rust-lang/rust/pull/50656
5683 [50812]: https://github.com/rust-lang/rust/pull/50812
5684 [50950]: https://github.com/rust-lang/rust/issues/50950
5685 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5687 Version 1.26.0 (2018-05-10)
5688 ==========================
5692 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5693 implement either or both traits.][49299]
5694 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5695 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5696 lifetime can be elided.][49458]
5697 - [`impl Trait` is now stable allowing you to have abstract types in returns
5698 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5699 `fn open(path: impl AsRef<Path>)`.
5700 - [Pattern matching will now automatically apply dereferences.][49394]
5701 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5702 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5703 - [A lot of operations are now available in a const context.][46882] E.g. You
5704 can now index into constant arrays, reference and dereference into constants,
5705 and use tuple struct constructors.
5706 - [Fixed entry slice patterns are now stable.][48516] E.g.
5708 let points = [1, 2, 3, 4];
5710 [1, 2, 3, 4] => println!("All points were sequential."),
5711 _ => println!("Not all points were sequential."),
5718 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5719 - [Fixed exponential projection complexity on nested types.][48296]
5720 This can provide up to a ~12% reduction in compile times for certain crates.
5721 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5722 to remap path prefixes outputted by the compiler.
5723 - [Added `powerpc-unknown-netbsd` target.][48281]
5727 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5728 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5729 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5730 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5731 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5732 - [`ascii::escape_default` is now available in libcore.][48735]
5733 - [Trailing commas are now supported in std and core macros.][48056]
5734 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5735 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5740 - [`*const T::copy_to_nonoverlapping`]
5741 - [`*const T::copy_to`]
5742 - [`*const T::read_unaligned`]
5743 - [`*const T::read_volatile`]
5744 - [`*const T::read`]
5746 - [`*const T::wrapping_add`]
5747 - [`*const T::wrapping_sub`]
5749 - [`*mut T::copy_to_nonoverlapping`]
5750 - [`*mut T::copy_to`]
5751 - [`*mut T::read_unaligned`]
5752 - [`*mut T::read_volatile`]
5754 - [`*mut T::replace`]
5757 - [`*mut T::wrapping_add`]
5758 - [`*mut T::wrapping_sub`]
5759 - [`*mut T::write_bytes`]
5760 - [`*mut T::write_unaligned`]
5761 - [`*mut T::write_volatile`]
5764 - [`FromUtf8Error::as_bytes`]
5765 - [`LocalKey::try_with`]
5766 - [`Option::cloned`]
5767 - [`btree_map::Entry::and_modify`]
5768 - [`fs::read_to_string`]
5771 - [`hash_map::Entry::and_modify`]
5772 - [`iter::FusedIterator`]
5773 - [`ops::RangeInclusive`]
5774 - [`ops::RangeToInclusive`]
5776 - [`slice::rotate_left`]
5777 - [`slice::rotate_right`]
5778 - [`String::retain`]
5783 - [Cargo will now output path to custom commands when `-v` is
5784 passed with `--list`][cargo/5041]
5785 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5789 - [The second edition of "The Rust Programming Language" book is now recommended
5790 over the first.][48404]
5795 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5796 syntax is now invalid.
5798 use std::ops::Fn as dyn;
5799 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5801 - [The result of dereferences are no longer promoted to `'static`.][47408]
5805 const PAIR: &(i32, i32) = &(0, 1);
5806 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5809 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5810 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5812 - [Removed hoedown from rustdoc.][48274]
5813 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5815 [46882]: https://github.com/rust-lang/rust/pull/46882
5816 [47379]: https://github.com/rust-lang/rust/pull/47379
5817 [47408]: https://github.com/rust-lang/rust/pull/47408
5818 [47813]: https://github.com/rust-lang/rust/pull/47813
5819 [48056]: https://github.com/rust-lang/rust/pull/48056
5820 [48125]: https://github.com/rust-lang/rust/pull/48125
5821 [48235]: https://github.com/rust-lang/rust/pull/48235
5822 [48274]: https://github.com/rust-lang/rust/pull/48274
5823 [48281]: https://github.com/rust-lang/rust/pull/48281
5824 [48296]: https://github.com/rust-lang/rust/pull/48296
5825 [48326]: https://github.com/rust-lang/rust/pull/48326
5826 [48359]: https://github.com/rust-lang/rust/pull/48359
5827 [48404]: https://github.com/rust-lang/rust/pull/48404
5828 [48481]: https://github.com/rust-lang/rust/pull/48481
5829 [48516]: https://github.com/rust-lang/rust/pull/48516
5830 [48628]: https://github.com/rust-lang/rust/pull/48628
5831 [48629]: https://github.com/rust-lang/rust/pull/48629
5832 [48657]: https://github.com/rust-lang/rust/pull/48657
5833 [48735]: https://github.com/rust-lang/rust/pull/48735
5834 [48978]: https://github.com/rust-lang/rust/pull/48978
5835 [49101]: https://github.com/rust-lang/rust/pull/49101
5836 [49109]: https://github.com/rust-lang/rust/pull/49109
5837 [49162]: https://github.com/rust-lang/rust/pull/49162
5838 [49255]: https://github.com/rust-lang/rust/pull/49255
5839 [49299]: https://github.com/rust-lang/rust/pull/49299
5840 [49305]: https://github.com/rust-lang/rust/pull/49305
5841 [49394]: https://github.com/rust-lang/rust/pull/49394
5842 [49458]: https://github.com/rust-lang/rust/pull/49458
5843 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5844 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5845 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5846 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5847 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5848 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5849 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5850 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5851 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5852 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5853 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5854 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5855 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5856 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5857 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5858 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5859 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5860 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5861 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5862 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5863 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5864 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5865 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5866 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5867 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5868 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5869 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5870 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5871 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5872 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5873 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5874 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5875 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5876 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5877 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5878 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5879 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5880 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5881 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5882 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5883 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5884 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5887 Version 1.25.0 (2018-03-29)
5888 ==========================
5892 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5893 - [You can now use nested groups of imports.][47948]
5894 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5895 - [You can now have `|` at the start of a match arm.][47947] e.g.
5897 enum Foo { A, B, C }
5903 | Foo::B => println!("AB"),
5904 | Foo::C => println!("C"),
5911 - [Upgraded to LLVM 6.][47828]
5912 - [Added `-C lto=val` option.][47521]
5913 - [Added `i586-unknown-linux-musl` target][47282]
5917 - [Impl Send for `process::Command` on Unix.][47760]
5918 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5919 - [`UnsafeCell::into_inner` is now safe.][47204]
5920 - [Implement libstd for CloudABI.][47268]
5921 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5922 - [Implement `AsRef<Path>` for Component][46985]
5923 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5924 - [Moved `Duration` to libcore.][46666]
5928 - [`Location::column`]
5931 The following functions can now be used in a constant expression.
5932 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5933 - [`Duration::new`][47300]
5934 - [`Duration::from_secs`][47300]
5935 - [`Duration::from_millis`][47300]
5939 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5940 - [`cargo new` now defaults to creating a binary crate, instead of a
5941 library crate.][cargo/5029]
5945 - [Rust by example is now shipped with new releases][46196]
5949 - [Deprecated `net::lookup_host`.][47510]
5950 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5951 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5952 around indexing operations (see [#47349][47349]). This has been fixed (which also
5953 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5954 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5956 [33903]: https://github.com/rust-lang/rust/pull/33903
5957 [47947]: https://github.com/rust-lang/rust/pull/47947
5958 [47948]: https://github.com/rust-lang/rust/pull/47948
5959 [47760]: https://github.com/rust-lang/rust/pull/47760
5960 [47790]: https://github.com/rust-lang/rust/pull/47790
5961 [47828]: https://github.com/rust-lang/rust/pull/47828
5962 [47398]: https://github.com/rust-lang/rust/pull/47398
5963 [47510]: https://github.com/rust-lang/rust/pull/47510
5964 [47521]: https://github.com/rust-lang/rust/pull/47521
5965 [47204]: https://github.com/rust-lang/rust/pull/47204
5966 [47251]: https://github.com/rust-lang/rust/pull/47251
5967 [47268]: https://github.com/rust-lang/rust/pull/47268
5968 [47282]: https://github.com/rust-lang/rust/pull/47282
5969 [47300]: https://github.com/rust-lang/rust/pull/47300
5970 [47349]: https://github.com/rust-lang/rust/pull/47349
5971 [46931]: https://github.com/rust-lang/rust/pull/46931
5972 [46985]: https://github.com/rust-lang/rust/pull/46985
5973 [47006]: https://github.com/rust-lang/rust/pull/47006
5974 [46830]: https://github.com/rust-lang/rust/pull/46830
5975 [46095]: https://github.com/rust-lang/rust/pull/46095
5976 [46666]: https://github.com/rust-lang/rust/pull/46666
5977 [46196]: https://github.com/rust-lang/rust/pull/46196
5978 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5979 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5980 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5981 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5982 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5985 Version 1.24.1 (2018-03-01)
5986 ==========================
5988 - [Do not abort when unwinding through FFI][48251]
5989 - [Emit UTF-16 files for linker arguments on Windows][48318]
5990 - [Make the error index generator work again][48308]
5991 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5993 [48251]: https://github.com/rust-lang/rust/issues/48251
5994 [48308]: https://github.com/rust-lang/rust/issues/48308
5995 [48318]: https://github.com/rust-lang/rust/issues/48318
5996 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5999 Version 1.24.0 (2018-02-15)
6000 ==========================
6004 - [External `sysv64` ffi is now available.][46528]
6005 eg. `extern "sysv64" fn foo () {}`
6009 - [rustc now uses 16 codegen units by default for release builds.][46910]
6010 For the fastest builds, utilize `codegen-units=1`.
6011 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
6012 - [Add `aarch64-unknown-openbsd` support][46760]
6016 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
6017 improvement in performance in the majority of cases.
6018 - [`OsStr`'s `Debug` implementation is now lossless and consistent
6019 with Windows.][46798]
6020 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
6021 - [impl `From<bool>` for `AtomicBool`][46293]
6022 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
6023 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
6024 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
6025 - [float::from_bits now just uses transmute.][46012] This provides
6026 some optimisations from LLVM.
6027 - [Copied `AsciiExt` methods onto `char`][46077]
6028 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
6029 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
6030 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
6031 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
6035 - [`RefCell::replace`]
6037 - [`atomic::spin_loop_hint`]
6039 The following functions can now be used in a constant expression.
6040 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
6042 - [`AtomicBool::new`][46287]
6043 - [`AtomicUsize::new`][46287]
6044 - [`AtomicIsize::new`][46287]
6045 - [`AtomicPtr::new`][46287]
6046 - [`Cell::new`][46287]
6047 - [`{integer}::min_value`][46287]
6048 - [`{integer}::max_value`][46287]
6049 - [`mem::size_of`][46287]
6050 - [`mem::align_of`][46287]
6051 - [`ptr::null`][46287]
6052 - [`ptr::null_mut`][46287]
6053 - [`RefCell::new`][46287]
6054 - [`UnsafeCell::new`][46287]
6058 - [Added a `workspace.default-members` config that
6059 overrides implied `--all` in virtual workspaces.][cargo/4743]
6060 - [Enable incremental by default on development builds.][cargo/4817] Also added
6061 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
6062 per-project or global basis respectively.
6069 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
6070 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
6071 in accordance with IETF RFC 4291 §2.2.
6072 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
6073 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
6074 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
6075 - [Leading zeros in tuple struct members is now an error][47084]
6076 - [`column!()` macro is one-based instead of zero-based][46977]
6077 - [`fmt::Arguments` can no longer be shared across threads][45198]
6078 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
6079 - [Cargo sets a different working directory for the compiler][cargo/4788]
6081 [44884]: https://github.com/rust-lang/rust/pull/44884
6082 [45198]: https://github.com/rust-lang/rust/pull/45198
6083 [45506]: https://github.com/rust-lang/rust/pull/45506
6084 [45990]: https://github.com/rust-lang/rust/pull/45990
6085 [46012]: https://github.com/rust-lang/rust/pull/46012
6086 [46077]: https://github.com/rust-lang/rust/pull/46077
6087 [46094]: https://github.com/rust-lang/rust/pull/46094
6088 [46284]: https://github.com/rust-lang/rust/pull/46284
6089 [46287]: https://github.com/rust-lang/rust/pull/46287
6090 [46293]: https://github.com/rust-lang/rust/pull/46293
6091 [46528]: https://github.com/rust-lang/rust/pull/46528
6092 [46671]: https://github.com/rust-lang/rust/pull/46671
6093 [46713]: https://github.com/rust-lang/rust/pull/46713
6094 [46735]: https://github.com/rust-lang/rust/pull/46735
6095 [46760]: https://github.com/rust-lang/rust/pull/46760
6096 [46798]: https://github.com/rust-lang/rust/pull/46798
6097 [46828]: https://github.com/rust-lang/rust/pull/46828
6098 [46831]: https://github.com/rust-lang/rust/pull/46831
6099 [46833]: https://github.com/rust-lang/rust/pull/46833
6100 [46910]: https://github.com/rust-lang/rust/pull/46910
6101 [46977]: https://github.com/rust-lang/rust/pull/46977
6102 [47018]: https://github.com/rust-lang/rust/pull/47018
6103 [47080]: https://github.com/rust-lang/rust/pull/47080
6104 [47084]: https://github.com/rust-lang/rust/pull/47084
6105 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6106 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6107 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6108 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6109 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6110 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6113 Version 1.23.0 (2018-01-04)
6114 ==========================
6118 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6119 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6120 Which should fix some confusing errors in some operations.
6124 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6125 undefined behavior.][45920]
6126 - [rustc now suggests renaming import if names clash.][45660]
6127 - [Display errors/warnings correctly when there are zero-width or
6128 wide characters.][45711]
6129 - [rustc now avoids unnecessary copies of arguments that are
6130 simple bindings][45380] This should improve memory usage on average by 5-10%.
6131 - [Updated musl used to build musl rustc to 1.1.17][45393]
6135 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6136 - [Implement Hash for raw pointers to unsized types][45483]
6137 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6138 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6139 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6140 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6141 and `<*mut T>::as_mut`][44932]
6142 - [Optimized `Thread::{park, unpark}` implementation][45524]
6143 - [Improved `SliceExt::binary_search` performance.][45333]
6144 - [impl `FromIterator<()>` for `()`][45379]
6145 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6153 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6154 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6155 - [Added unit test checking to `cargo check`][cargo/4592]
6156 - [Cargo now lets you install a specific version
6157 using `cargo install --version`][cargo/4637]
6161 - [Releases now ship with the Cargo book documentation.][45692]
6162 - [rustdoc now prints rendering warnings on every run.][45324]
6166 - [Changes have been made to type equality to make it more correct,
6167 in rare cases this could break some code.][45853] [Tracking issue for
6168 further information][45852]
6169 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6170 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6171 Android 9, the minimum supported version is Android 14.
6172 - [Bumped the minimum LLVM to 3.9][45326]
6174 [44042]: https://github.com/rust-lang/rust/pull/44042
6175 [44932]: https://github.com/rust-lang/rust/pull/44932
6176 [45267]: https://github.com/rust-lang/rust/pull/45267
6177 [45324]: https://github.com/rust-lang/rust/pull/45324
6178 [45326]: https://github.com/rust-lang/rust/pull/45326
6179 [45333]: https://github.com/rust-lang/rust/pull/45333
6180 [45379]: https://github.com/rust-lang/rust/pull/45379
6181 [45380]: https://github.com/rust-lang/rust/pull/45380
6182 [45393]: https://github.com/rust-lang/rust/pull/45393
6183 [45435]: https://github.com/rust-lang/rust/pull/45435
6184 [45483]: https://github.com/rust-lang/rust/pull/45483
6185 [45524]: https://github.com/rust-lang/rust/pull/45524
6186 [45571]: https://github.com/rust-lang/rust/pull/45571
6187 [45580]: https://github.com/rust-lang/rust/pull/45580
6188 [45610]: https://github.com/rust-lang/rust/pull/45610
6189 [45660]: https://github.com/rust-lang/rust/pull/45660
6190 [45692]: https://github.com/rust-lang/rust/pull/45692
6191 [45711]: https://github.com/rust-lang/rust/pull/45711
6192 [45772]: https://github.com/rust-lang/rust/pull/45772
6193 [45852]: https://github.com/rust-lang/rust/issues/45852
6194 [45853]: https://github.com/rust-lang/rust/pull/45853
6195 [45887]: https://github.com/rust-lang/rust/pull/45887
6196 [45920]: https://github.com/rust-lang/rust/pull/45920
6197 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6198 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6199 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6202 Version 1.22.1 (2017-11-22)
6203 ==========================
6205 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6207 [46183]: https://github.com/rust-lang/rust/pull/46183
6209 Version 1.22.0 (2017-11-22)
6210 ==========================
6214 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6215 - [Now accepts underscores in unicode escapes][43716]
6216 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6217 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6221 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6222 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6223 This should decrease compile times for debug builds.
6224 - [strict memory alignment now enabled on ARMv6][45094]
6225 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6229 - [Allow atomic operations up to 32 bits
6230 on `armv5te_unknown_linux_gnueabi`][44978]
6231 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6232 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6233 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6234 - [Properly detect overflow in `Instant += Duration`.][44220]
6235 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6236 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6237 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6244 - [Cargo will now build multi file examples in subdirectories of the `examples`
6245 folder that have a `main.rs` file.][cargo/4496]
6246 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6247 the old format will continue to work and can be updated with `cargo update`.
6248 - [Now supports vendoring git repositories][cargo/3992]
6252 - [`libbacktrace` is now available on Apple platforms.][44251]
6253 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6254 This now lets you specify that a given code example will fail to compile.
6258 - [The minimum Android version that rustc can build for has been bumped
6259 to `4.0` from `2.3`][45656]
6260 - [Allowing `T op= &T` for numeric types has broken some type
6261 inference cases][45480]
6264 [42526]: https://github.com/rust-lang/rust/pull/42526
6265 [43716]: https://github.com/rust-lang/rust/pull/43716
6266 [43949]: https://github.com/rust-lang/rust/pull/43949
6267 [44015]: https://github.com/rust-lang/rust/pull/44015
6268 [44220]: https://github.com/rust-lang/rust/pull/44220
6269 [44251]: https://github.com/rust-lang/rust/pull/44251
6270 [44287]: https://github.com/rust-lang/rust/pull/44287
6271 [44303]: https://github.com/rust-lang/rust/pull/44303
6272 [44456]: https://github.com/rust-lang/rust/pull/44456
6273 [44466]: https://github.com/rust-lang/rust/pull/44466
6274 [44895]: https://github.com/rust-lang/rust/pull/44895
6275 [44966]: https://github.com/rust-lang/rust/pull/44966
6276 [44978]: https://github.com/rust-lang/rust/pull/44978
6277 [45041]: https://github.com/rust-lang/rust/pull/45041
6278 [45064]: https://github.com/rust-lang/rust/pull/45064
6279 [45075]: https://github.com/rust-lang/rust/pull/45075
6280 [45094]: https://github.com/rust-lang/rust/pull/45094
6281 [45095]: https://github.com/rust-lang/rust/pull/45095
6282 [45480]: https://github.com/rust-lang/rust/issues/45480
6283 [45656]: https://github.com/rust-lang/rust/pull/45656
6284 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6285 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6286 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6293 Version 1.21.0 (2017-10-12)
6294 ==========================
6298 - [You can now use static references for literals.][43838]
6302 let x: &'static u32 = &0;
6305 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6308 my_macro!(Vec<i32>::new); // Always worked
6309 my_macro!(Vec::<i32>::new); // Now works
6314 - [Upgraded jemalloc to 4.5.0][43911]
6315 - [Enabled unwinding panics on Redox][43917]
6316 - [Now runs LLVM in parallel during translation phase.][43506]
6317 This should reduce peak memory usage.
6321 - [Generate builtin impls for `Clone` for all arrays and tuples that
6322 are `T: Clone`][43690]
6323 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6324 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6325 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6330 [`std::mem::discriminant`]
6334 - [You can now call `cargo install` with multiple package names][cargo/4216]
6335 - [Cargo commands inside a virtual workspace will now implicitly
6336 pass `--all`][cargo/4335]
6337 - [Added a `[patch]` section to `Cargo.toml` to handle
6338 prepublication dependencies][cargo/4123] [RFC 1969]
6339 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6340 like patterns][cargo/4270]
6341 - [Added the `--all-targets` option][cargo/4400]
6342 - [Using required dependencies as a feature is now deprecated and emits
6343 a warning][cargo/4364]
6348 - [Cargo docs are moving][43916]
6349 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6350 - [The rustdoc book is now available][43863]
6351 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6352 - [Added a preview of RLS has been made available through rustup][44204]
6353 Install with `rustup component add rls-preview`
6354 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6355 Previously only showed `std::os::unix`.
6359 - [Changes in method matching against higher-ranked types][43880] This may cause
6360 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6361 - [rustc's JSON error output's byte position start at top of file.][42973]
6362 Was previously relative to the rustc's internal `CodeMap` struct which
6363 required the unstable library `libsyntax` to correctly use.
6364 - [`unused_results` lint no longer ignores booleans][43728]
6366 [42565]: https://github.com/rust-lang/rust/pull/42565
6367 [42973]: https://github.com/rust-lang/rust/pull/42973
6368 [43348]: https://github.com/rust-lang/rust/pull/43348
6369 [43459]: https://github.com/rust-lang/rust/pull/43459
6370 [43506]: https://github.com/rust-lang/rust/pull/43506
6371 [43540]: https://github.com/rust-lang/rust/pull/43540
6372 [43690]: https://github.com/rust-lang/rust/pull/43690
6373 [43728]: https://github.com/rust-lang/rust/pull/43728
6374 [43838]: https://github.com/rust-lang/rust/pull/43838
6375 [43863]: https://github.com/rust-lang/rust/pull/43863
6376 [43880]: https://github.com/rust-lang/rust/pull/43880
6377 [43911]: https://github.com/rust-lang/rust/pull/43911
6378 [43916]: https://github.com/rust-lang/rust/pull/43916
6379 [43917]: https://github.com/rust-lang/rust/pull/43917
6380 [44204]: https://github.com/rust-lang/rust/pull/44204
6381 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6382 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6383 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6384 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6385 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6386 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6387 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6388 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6389 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6391 Version 1.20.0 (2017-08-31)
6392 ===========================
6396 - [Associated constants are now stabilised.][42809]
6397 - [A lot of macro bugs are now fixed.][42913]
6402 - [Struct fields are now properly coerced to the expected field type.][42807]
6403 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6404 `wasm32-experimental-emscripten` target.
6405 - [Changed some of the error messages to be more helpful.][42033]
6406 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6408 - [rustc now reports the total number of errors on compilation failure][43015]
6409 previously this was only the number of errors in the pass that failed.
6410 - [Expansion in rustc has been sped up 29x.][42533]
6411 - [added `msp430-none-elf` target.][43099]
6412 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6414 - [Fixes backtraces on Redox][43228]
6415 - [rustc now identifies different versions of same crate when absolute paths of
6416 different types match in an error message.][42826]
6422 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6423 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6425 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6426 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6427 - [Impl `Clone` for `DefaultHasher`.][42799]
6428 - [Impl `Sync` for `SyncSender`.][42397]
6429 - [Impl `FromStr` for `char`][42271]
6430 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6432 - [allow messages in the `unimplemented!()` macro.][42155]
6433 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6434 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6435 - [Upgrade to Unicode 10.0.0][42999]
6436 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6437 - [Skip the main thread's manual stack guard on Linux][43072]
6438 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6439 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6441 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6446 - [`CStr::into_c_string`]
6447 - [`CString::as_c_str`]
6448 - [`CString::into_boxed_c_str`]
6449 - [`Chain::get_mut`]
6450 - [`Chain::get_ref`]
6451 - [`Chain::into_inner`]
6452 - [`Option::get_or_insert_with`]
6453 - [`Option::get_or_insert`]
6454 - [`OsStr::into_os_string`]
6455 - [`OsString::into_boxed_os_str`]
6458 - [`Utf8Error::error_len`]
6459 - [`char::EscapeDebug`]
6460 - [`char::escape_debug`]
6461 - [`compile_error!`]
6462 - [`f32::from_bits`]
6464 - [`f64::from_bits`]
6466 - [`mem::ManuallyDrop`]
6467 - [`slice::sort_unstable_by_key`]
6468 - [`slice::sort_unstable_by`]
6469 - [`slice::sort_unstable`]
6470 - [`str::from_boxed_utf8_unchecked`]
6471 - [`str::as_bytes_mut`]
6472 - [`str::as_bytes_mut`]
6473 - [`str::from_utf8_mut`]
6474 - [`str::from_utf8_unchecked_mut`]
6476 - [`str::get_unchecked_mut`]
6477 - [`str::get_unchecked`]
6479 - [`str::into_boxed_bytes`]
6484 - [Cargo API token location moved from `~/.cargo/config` to
6485 `~/.cargo/credentials`.][cargo/3978]
6486 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6487 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6488 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6489 - [You can now specify version of a binary when installed through
6490 `cargo install` using `--vers`.][cargo/4229]
6491 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6492 failure.][cargo/4248]
6493 - [Changed the convention around which file is the crate root.][cargo/4259]
6498 - [Functions with `'static` in their return types will now not be as usable as
6499 if they were using lifetime parameters instead.][42417]
6500 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6501 takes the sign of NaN into account where previously didn't.][42430]
6503 [42033]: https://github.com/rust-lang/rust/pull/42033
6504 [42155]: https://github.com/rust-lang/rust/pull/42155
6505 [42271]: https://github.com/rust-lang/rust/pull/42271
6506 [42397]: https://github.com/rust-lang/rust/pull/42397
6507 [42417]: https://github.com/rust-lang/rust/pull/42417
6508 [42430]: https://github.com/rust-lang/rust/pull/42430
6509 [42431]: https://github.com/rust-lang/rust/pull/42431
6510 [42533]: https://github.com/rust-lang/rust/pull/42533
6511 [42571]: https://github.com/rust-lang/rust/pull/42571
6512 [42613]: https://github.com/rust-lang/rust/pull/42613
6513 [42799]: https://github.com/rust-lang/rust/pull/42799
6514 [42807]: https://github.com/rust-lang/rust/pull/42807
6515 [42809]: https://github.com/rust-lang/rust/pull/42809
6516 [42822]: https://github.com/rust-lang/rust/pull/42822
6517 [42826]: https://github.com/rust-lang/rust/pull/42826
6518 [42854]: https://github.com/rust-lang/rust/pull/42854
6519 [42913]: https://github.com/rust-lang/rust/pull/42913
6520 [42999]: https://github.com/rust-lang/rust/pull/42999
6521 [43011]: https://github.com/rust-lang/rust/pull/43011
6522 [43015]: https://github.com/rust-lang/rust/pull/43015
6523 [43072]: https://github.com/rust-lang/rust/pull/43072
6524 [43077]: https://github.com/rust-lang/rust/pull/43077
6525 [43097]: https://github.com/rust-lang/rust/pull/43097
6526 [43099]: https://github.com/rust-lang/rust/pull/43099
6527 [43170]: https://github.com/rust-lang/rust/pull/43170
6528 [43178]: https://github.com/rust-lang/rust/pull/43178
6529 [43185]: https://github.com/rust-lang/rust/pull/43185
6530 [43228]: https://github.com/rust-lang/rust/pull/43228
6531 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6532 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6533 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6534 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6535 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6536 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6537 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6538 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6539 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6540 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6541 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6542 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6543 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6544 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6545 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6546 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6547 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6548 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6549 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6550 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6551 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6552 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6553 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6554 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6555 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6556 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6557 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6558 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6559 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6560 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6561 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6562 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6563 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6564 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6565 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6566 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6567 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6568 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6571 Version 1.19.0 (2017-07-20)
6572 ===========================
6577 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6578 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6579 - [Macro recursion limit increased to 1024 from 64.][41676]
6580 - [Added lint for detecting unused macros.][41907]
6581 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6582 For example: `let x = loop { break 7; };`
6583 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6584 contain `Copy` types and cannot have a `Drop` implementation.
6585 Example: `union Foo { bar: u8, baz: usize }`
6586 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6587 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6592 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6593 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6594 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6595 you should use `--target armv7-linux-androideabi`.
6596 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6597 - [Minor optimisation of string operations.][42037]
6598 - [Compiler error message is now `aborting due to previous error(s)` instead of
6599 `aborting due to N previous errors`][42150] This was previously inaccurate and
6600 would only count certain kinds of errors.
6601 - [The compiler now supports Visual Studio 2017][42225]
6602 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6603 - [Added a lot][42264] of [new error codes][42302]
6604 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6605 libraries with C Run-time Libraries(CRT) to be statically linked.
6606 - [Fixed various ARM codegen bugs][42740]
6611 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6612 `Extend<Cow<'a, str>>`][41449]
6613 - [`Vec` now implements `From<&mut [T]>`][41530]
6614 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6615 - [`SplitWhitespace` now implements `Clone`][41659]
6616 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6618 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6619 macros, but for printing to stderr.
6624 - [`OsString::shrink_to_fit`]
6627 - [`thread::ThreadId`]
6632 - [Build scripts can now add environment variables to the environment
6633 the crate is being compiled in.
6634 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6635 - [Subcommands now replace the current process rather than spawning a new
6636 child process][cargo/3970]
6637 - [Workspace members can now accept glob file patterns][cargo/3979]
6638 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6639 the members in a given workspace.][cargo/3988]
6640 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6641 - [Target directory path is now in the cargo metadata][cargo/4022]
6642 - [Cargo no longer checks out a local working directory for the
6643 crates.io index][cargo/4026] This should provide smaller file size for the
6644 registry, and improve cloning times, especially on Windows machines.
6645 - [Added an `--exclude` option for excluding certain packages when using the
6646 `--all` option][cargo/4031]
6647 - [Cargo will now automatically retry when receiving a 5xx error
6648 from crates.io][cargo/4032]
6649 - [The `--features` option now accepts multiple comma or space
6650 delimited values.][cargo/4084]
6651 - [Added support for custom target specific runners][cargo/3954]
6656 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6658 - [Rust will now release XZ compressed packages][rust-installer/57]
6659 - [rustup will now prefer to download rust packages with
6660 XZ compression][rustup/1100] over GZip packages.
6661 - [Added the ability to escape `#` in rust documentation][41785] By adding
6662 additional `#`'s ie. `##` is now `#`
6667 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6668 - [`-Z` flags are now no longer allowed to be used on the stable
6669 compiler.][41751] This has been a warning for a year previous to this.
6670 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6671 longer works][42844]. Users should migrate to the built-in `check`
6672 command, which has been available since 1.16.
6673 - [Ending a float literal with `._` is now a hard error.
6674 Example: `42._` .][41946]
6675 - [Any use of a private `extern crate` outside of its module is now a
6676 hard error.][36886] This was previously a warning.
6677 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6678 relative while the `::` prefix makes a path absolute, but was ignored and the
6679 path was relative regardless.
6680 - [Floating point constants in match patterns is now a hard error][36890]
6681 This was previously a warning.
6682 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6683 match patterns is now a hard error][36891] This was previously a warning.
6684 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6686 - [From the pound escape, lines consisting of multiple `#`s are
6688 - [It is an error to re-export private enum variants][42460]. This is
6689 known to break a number of crates that depend on an older version of
6691 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6692 to use it to find the linker, and the build will fail where it did
6693 not previously][42607]
6695 [36886]: https://github.com/rust-lang/rust/issues/36886
6696 [36888]: https://github.com/rust-lang/rust/issues/36888
6697 [36890]: https://github.com/rust-lang/rust/issues/36890
6698 [36891]: https://github.com/rust-lang/rust/issues/36891
6699 [36892]: https://github.com/rust-lang/rust/issues/36892
6700 [37406]: https://github.com/rust-lang/rust/issues/37406
6701 [39983]: https://github.com/rust-lang/rust/pull/39983
6702 [41145]: https://github.com/rust-lang/rust/pull/41145
6703 [41192]: https://github.com/rust-lang/rust/pull/41192
6704 [41258]: https://github.com/rust-lang/rust/pull/41258
6705 [41370]: https://github.com/rust-lang/rust/pull/41370
6706 [41449]: https://github.com/rust-lang/rust/pull/41449
6707 [41530]: https://github.com/rust-lang/rust/pull/41530
6708 [41624]: https://github.com/rust-lang/rust/pull/41624
6709 [41656]: https://github.com/rust-lang/rust/pull/41656
6710 [41659]: https://github.com/rust-lang/rust/pull/41659
6711 [41676]: https://github.com/rust-lang/rust/pull/41676
6712 [41751]: https://github.com/rust-lang/rust/pull/41751
6713 [41764]: https://github.com/rust-lang/rust/pull/41764
6714 [41785]: https://github.com/rust-lang/rust/pull/41785
6715 [41873]: https://github.com/rust-lang/rust/pull/41873
6716 [41907]: https://github.com/rust-lang/rust/pull/41907
6717 [41946]: https://github.com/rust-lang/rust/pull/41946
6718 [42016]: https://github.com/rust-lang/rust/pull/42016
6719 [42037]: https://github.com/rust-lang/rust/pull/42037
6720 [42068]: https://github.com/rust-lang/rust/pull/42068
6721 [42150]: https://github.com/rust-lang/rust/pull/42150
6722 [42162]: https://github.com/rust-lang/rust/pull/42162
6723 [42225]: https://github.com/rust-lang/rust/pull/42225
6724 [42264]: https://github.com/rust-lang/rust/pull/42264
6725 [42302]: https://github.com/rust-lang/rust/pull/42302
6726 [42460]: https://github.com/rust-lang/rust/issues/42460
6727 [42607]: https://github.com/rust-lang/rust/issues/42607
6728 [42740]: https://github.com/rust-lang/rust/pull/42740
6729 [42844]: https://github.com/rust-lang/rust/issues/42844
6730 [42948]: https://github.com/rust-lang/rust/pull/42948
6731 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6732 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6733 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6734 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6735 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6736 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6737 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6738 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6739 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6740 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6741 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6742 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6743 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6744 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6745 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6746 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6747 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6748 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6749 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6750 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6751 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6752 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6755 Version 1.18.0 (2017-06-08)
6756 ===========================
6761 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6762 make the item visible to just that module tree. Also accepts the keyword
6763 `crate` to make something public to the whole crate but not users of the
6764 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6765 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6766 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6767 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6768 types like `Write + Send`, trailing `+` are now supported in trait objects,
6769 and better error reporting for trait objects starting with `?Sized`.
6770 - [0e+10 is now a valid floating point literal][40589]
6771 - [Now warns if you bind a lifetime parameter to 'static][40734]
6772 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6773 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6774 representation in some cases.][40377]
6779 - [rustc can now emit mir with `--emit mir`][39891]
6780 - [Improved LLVM IR for trivial functions][40367]
6781 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6782 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6783 opportunities found through profiling
6784 - [Improved backtrace formatting when panicking][38165]
6789 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6790 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6791 iteration or reallocation.
6792 - [Simplified HashMap Bucket interface][40561] provides performance
6793 improvements for iterating and cloning.
6794 - [Specialize Vec::from_elem to use calloc][40409]
6795 - [Fixed Race condition in fs::create_dir_all][39799]
6796 - [No longer caching stdio on Windows][40516]
6797 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6798 2.50%~ faster and in one case now 12.50% faster.
6799 - [Optimized `AtomicBool::fetch_nand`][41143]
6804 - [`Child::try_wait`]
6805 - [`HashMap::retain`]
6806 - [`HashSet::retain`]
6808 - [`TcpStream::peek`]
6809 - [`UdpSocket::peek`]
6810 - [`UdpSocket::peek_from`]
6815 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6816 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6817 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6818 - [Added Android build support][cargo/3885]
6819 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6820 of a certain type, for example `cargo build --bins` will build all
6822 - [Added support for haiku][cargo/3952]
6827 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6828 - [Rust now uses the official cross compiler for NetBSD][40612]
6829 - [rustdoc now accepts `#` at the start of files][40828]
6830 - [Fixed jemalloc support for musl][41168]
6835 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6836 always placed after the sign if it exists and before the digits. With the `#`
6837 flag the zeroes are placed after the prefix and before the digits.
6838 - [Due to the struct field optimisation][40377], using `transmute` on structs
6839 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6840 always been undefined behavior, but is now more likely to break in practice.
6841 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6842 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6843 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6844 - [Overlapping inherent `impl`s are now a hard error][40728]
6845 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6846 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6847 `out.asm` and `out.ll` instead of only one of the filetypes.
6848 - [ calling a function that returns `Self` will no longer work][41805] when
6849 the size of `Self` cannot be statically determined.
6850 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6851 this has caused a few regressions namely:
6853 - Changed the link order of local static/dynamic libraries (respecting the
6854 order on given rather than having the compiler reorder).
6855 - Changed how MinGW is linked, native code linked to dynamic libraries
6856 may require manually linking to the gcc support library (for the native
6859 [38165]: https://github.com/rust-lang/rust/pull/38165
6860 [39799]: https://github.com/rust-lang/rust/pull/39799
6861 [39891]: https://github.com/rust-lang/rust/pull/39891
6862 [40043]: https://github.com/rust-lang/rust/pull/40043
6863 [40241]: https://github.com/rust-lang/rust/pull/40241
6864 [40338]: https://github.com/rust-lang/rust/pull/40338
6865 [40367]: https://github.com/rust-lang/rust/pull/40367
6866 [40377]: https://github.com/rust-lang/rust/pull/40377
6867 [40409]: https://github.com/rust-lang/rust/pull/40409
6868 [40516]: https://github.com/rust-lang/rust/pull/40516
6869 [40556]: https://github.com/rust-lang/rust/pull/40556
6870 [40561]: https://github.com/rust-lang/rust/pull/40561
6871 [40589]: https://github.com/rust-lang/rust/pull/40589
6872 [40612]: https://github.com/rust-lang/rust/pull/40612
6873 [40723]: https://github.com/rust-lang/rust/pull/40723
6874 [40728]: https://github.com/rust-lang/rust/pull/40728
6875 [40731]: https://github.com/rust-lang/rust/pull/40731
6876 [40734]: https://github.com/rust-lang/rust/pull/40734
6877 [40805]: https://github.com/rust-lang/rust/pull/40805
6878 [40807]: https://github.com/rust-lang/rust/pull/40807
6879 [40828]: https://github.com/rust-lang/rust/pull/40828
6880 [40870]: https://github.com/rust-lang/rust/pull/40870
6881 [41085]: https://github.com/rust-lang/rust/pull/41085
6882 [41143]: https://github.com/rust-lang/rust/pull/41143
6883 [41168]: https://github.com/rust-lang/rust/pull/41168
6884 [41270]: https://github.com/rust-lang/rust/issues/41270
6885 [41469]: https://github.com/rust-lang/rust/pull/41469
6886 [41805]: https://github.com/rust-lang/rust/issues/41805
6887 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6888 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6889 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6890 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6891 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6892 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6893 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6894 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6895 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6896 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6897 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6898 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6899 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6900 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6903 Version 1.17.0 (2017-04-27)
6904 ===========================
6909 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6910 * [Fields of structs may be initialized without duplicating the field/variable
6911 names][39761]. [RFC 1682]
6912 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6913 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6914 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6915 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6916 `'b`. Soundness fix.
6917 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6918 * [Static variables may contain references to other statics][40027]
6923 * [Exit quickly on only `--emit dep-info`][40336]
6924 * [Make `-C relocation-model` more correctly determine whether the linker
6925 creates a position-independent executable][40245]
6926 * [Add `-C overflow-checks` to directly control whether integer overflow
6928 * [The rustc type checker now checks items on demand instead of in a single
6929 in-order pass][40008]. This is mostly an internal refactoring in support of
6930 future work, including incremental type checking, but also resolves [RFC
6931 1647], allowing `Self` to appear in `impl` `where` clauses.
6932 * [Optimize vtable loads][39995]
6933 * [Turn off vectorization for Emscripten targets][39990]
6934 * [Provide suggestions for unknown macros imported with `use`][39953]
6935 * [Fix ICEs in path resolution][39939]
6936 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6937 * [Add clearer error message using `&str + &str`][39116]
6948 * [`Ordering::then`]
6949 * [`Ordering::then_with`]
6950 * [`BTreeMap::range`]
6951 * [`BTreeMap::range_mut`]
6952 * [`collections::Bound`]
6953 * [`process::abort`]
6954 * [`ptr::read_unaligned`]
6955 * [`ptr::write_unaligned`]
6956 * [`Result::expect_err`]
6959 * [`Cell::into_inner`]
6965 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6966 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6967 * [`String` implements `FromIterator<&char>`][40028]
6968 * `Box` [implements][40009] a number of new conversions:
6969 `From<Box<str>> for String`,
6970 `From<Box<[T]>> for Vec<T>`,
6971 `From<Box<CStr>> for CString`,
6972 `From<Box<OsStr>> for OsString`,
6973 `From<Box<Path>> for PathBuf`,
6974 `Into<Box<str>> for String`,
6975 `Into<Box<[T]>> for Vec<T>`,
6976 `Into<Box<CStr>> for CString`,
6977 `Into<Box<OsStr>> for OsString`,
6978 `Into<Box<Path>> for PathBuf`,
6979 `Default for Box<str>`,
6980 `Default for Box<CStr>`,
6981 `Default for Box<OsStr>`,
6982 `From<&CStr> for Box<CStr>`,
6983 `From<&OsStr> for Box<OsStr>`,
6984 `From<&Path> for Box<Path>`
6985 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6986 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6987 * [Slightly optimize `slice::sort`][39538]
6988 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6989 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6990 `Box<str>` implements `From<&str>`][39438]
6991 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6992 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6993 * [`format!` estimates the needed capacity before writing a string][39356]
6994 * [Support unprivileged symlink creation in Windows][38921]
6995 * [`PathBuf` implements `Default`][38764]
6996 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6997 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6998 and poor hash functions.
7003 * [Add `cargo check --all`][cargo/3731]
7004 * [Add an option to ignore SSL revocation checking][cargo/3699]
7005 * [Add `cargo run --package`][cargo/3691]
7006 * [Add `required_features`][cargo/3667]
7007 * [Assume `build.rs` is a build script][cargo/3664]
7008 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
7013 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
7015 * [The "Unstable Book" documents nightly-only features][ubook]
7016 * [Improve the style of the sidebar in rustdoc output][40265]
7017 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
7018 * [Fix MSP430 breakage due to `i128`][40257]
7019 * [Preliminary Solaris/SPARCv9 support][39903]
7020 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
7021 run without installing the MSVC runtime.
7022 * [`rustdoc --test` includes file names in test names][39788]
7023 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
7024 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
7025 * [Initial support for `aarch64-unknown-freebsd`][39491]
7026 * [Initial support for `i686-unknown-netbsd`][39426]
7027 * [This release no longer includes the old makefile build system][39431]. Rust
7028 is built with a custom build system, written in Rust, and with Cargo.
7029 * [Add Debug implementations for libcollection structs][39002]
7030 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
7031 * [`--test-threads=0` produces an error][38945]
7032 * [`rustup` installs documentation by default][40526]
7033 * [The Rust source includes NatVis visualizations][39843]. These can be used by
7034 WinDbg and Visual Studio to improve the debugging experience.
7039 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
7040 workaround, either use MSVC 2015 or run vcvars.bat.
7041 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7042 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
7043 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
7045 * [`format!` and `Display::to_string` panic if an underlying formatting
7046 implementation returns an error][40117]. Previously the error was silently
7047 ignored. It is incorrect for `write_fmt` to return an error when writing
7049 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
7050 crates were marked stable and could be accessed from the stable toolchain.
7051 * [Rust git source no longer includes vendored crates][39728]. Those that need
7052 to build with vendored crates should build from release tarballs.
7053 * [Fix inert attributes from `proc_macro_derives`][39572]
7054 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
7055 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
7057 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
7058 existing code generally ignores the type of dead-code unless a type-hint is
7059 provided; this can cause surprising inference interactions particularly around
7060 defaulting. The new code uniformly ignores the result type of dead-code.
7061 * [Tuple-struct constructors with private fields are no longer visible][38932]
7062 * [Lifetime parameters that do not appear in the arguments are now considered
7063 early-bound][38897], resolving a soundness bug (#[32330]). The
7064 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
7066 * [rustdoc: fix doctests with non-feature crate attributes][38161]
7067 * [Make transmuting from fn item types to pointer-sized types a hard
7070 [27787]: https://github.com/rust-lang/rust/issues/27787
7071 [32330]: https://github.com/rust-lang/rust/issues/32330
7072 [34198]: https://github.com/rust-lang/rust/pull/34198
7073 [38161]: https://github.com/rust-lang/rust/pull/38161
7074 [38368]: https://github.com/rust-lang/rust/pull/38368
7075 [38584]: https://github.com/rust-lang/rust/issues/38584
7076 [38661]: https://github.com/rust-lang/rust/pull/38661
7077 [38764]: https://github.com/rust-lang/rust/pull/38764
7078 [38864]: https://github.com/rust-lang/rust/issues/38864
7079 [38897]: https://github.com/rust-lang/rust/pull/38897
7080 [38921]: https://github.com/rust-lang/rust/pull/38921
7081 [38932]: https://github.com/rust-lang/rust/pull/38932
7082 [38945]: https://github.com/rust-lang/rust/pull/38945
7083 [38981]: https://github.com/rust-lang/rust/pull/38981
7084 [39002]: https://github.com/rust-lang/rust/pull/39002
7085 [39116]: https://github.com/rust-lang/rust/pull/39116
7086 [39193]: https://github.com/rust-lang/rust/pull/39193
7087 [39265]: https://github.com/rust-lang/rust/pull/39265
7088 [39356]: https://github.com/rust-lang/rust/pull/39356
7089 [39372]: https://github.com/rust-lang/rust/pull/39372
7090 [39426]: https://github.com/rust-lang/rust/pull/39426
7091 [39431]: https://github.com/rust-lang/rust/pull/39431
7092 [39438]: https://github.com/rust-lang/rust/pull/39438
7093 [39440]: https://github.com/rust-lang/rust/pull/39440
7094 [39485]: https://github.com/rust-lang/rust/pull/39485
7095 [39491]: https://github.com/rust-lang/rust/pull/39491
7096 [39518]: https://github.com/rust-lang/rust/pull/39518
7097 [39538]: https://github.com/rust-lang/rust/pull/39538
7098 [39572]: https://github.com/rust-lang/rust/pull/39572
7099 [39633]: https://github.com/rust-lang/rust/pull/39633
7100 [39642]: https://github.com/rust-lang/rust/pull/39642
7101 [39728]: https://github.com/rust-lang/rust/pull/39728
7102 [39761]: https://github.com/rust-lang/rust/pull/39761
7103 [39788]: https://github.com/rust-lang/rust/pull/39788
7104 [39793]: https://github.com/rust-lang/rust/pull/39793
7105 [39837]: https://github.com/rust-lang/rust/pull/39837
7106 [39843]: https://github.com/rust-lang/rust/pull/39843
7107 [39851]: https://github.com/rust-lang/rust/pull/39851
7108 [39903]: https://github.com/rust-lang/rust/pull/39903
7109 [39939]: https://github.com/rust-lang/rust/pull/39939
7110 [39953]: https://github.com/rust-lang/rust/pull/39953
7111 [39960]: https://github.com/rust-lang/rust/pull/39960
7112 [39990]: https://github.com/rust-lang/rust/pull/39990
7113 [39995]: https://github.com/rust-lang/rust/pull/39995
7114 [40008]: https://github.com/rust-lang/rust/pull/40008
7115 [40009]: https://github.com/rust-lang/rust/pull/40009
7116 [40027]: https://github.com/rust-lang/rust/pull/40027
7117 [40028]: https://github.com/rust-lang/rust/pull/40028
7118 [40037]: https://github.com/rust-lang/rust/pull/40037
7119 [40117]: https://github.com/rust-lang/rust/pull/40117
7120 [40166]: https://github.com/rust-lang/rust/pull/40166
7121 [40245]: https://github.com/rust-lang/rust/pull/40245
7122 [40257]: https://github.com/rust-lang/rust/pull/40257
7123 [40261]: https://github.com/rust-lang/rust/pull/40261
7124 [40265]: https://github.com/rust-lang/rust/pull/40265
7125 [40319]: https://github.com/rust-lang/rust/pull/40319
7126 [40336]: https://github.com/rust-lang/rust/pull/40336
7127 [40526]: https://github.com/rust-lang/rust/pull/40526
7128 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7129 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7130 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7131 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7132 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7133 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7134 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7135 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7136 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7137 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7138 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7139 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7140 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7141 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7142 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7143 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7144 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7145 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7146 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7147 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7148 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7149 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7150 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7151 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7152 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7153 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7154 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7155 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7156 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7157 [ubook]: https://doc.rust-lang.org/unstable-book/
7160 Version 1.16.0 (2017-03-16)
7161 ===========================
7166 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7167 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7168 match patterns][38069]
7169 * [Clean up semantics of `self` in an import list][38313]
7170 * [`Self` may appear in `impl` headers][38920]
7171 * [`Self` may appear in struct expressions][39282]
7176 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7177 a `.rmeta` file containing only crate metadata][38571]. This can be
7178 used by tools like the Rust Language Service to perform
7179 metadata-only builds.
7180 * [Levenshtein based typo suggestions now work in most places, while
7181 previously they worked only for fields and sometimes for local
7182 variables][38927]. Together with the overhaul of "no
7183 resolution"/"unexpected resolution" errors (#[38154]) they result in
7184 large and systematic improvement in resolution diagnostics.
7185 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7187 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7188 * [`rustc` no longer attempts to provide "consider using an explicit
7189 lifetime" suggestions][37057]. They were inaccurate.
7194 * [`VecDeque::truncate`]
7195 * [`VecDeque::resize`]
7196 * [`String::insert_str`]
7197 * [`Duration::checked_add`]
7198 * [`Duration::checked_sub`]
7199 * [`Duration::checked_div`]
7200 * [`Duration::checked_mul`]
7203 * [`SocketAddr::is_ipv4`]
7204 * [`SocketAddr::is_ipv6`]
7205 * [`IpAddr::is_ipv4`]
7206 * [`IpAddr::is_ipv6`]
7208 * [`Vec::dedup_by_key`]
7209 * [`Result::unwrap_or_default`]
7210 * [`<*const T>::wrapping_offset`]
7211 * [`<*mut T>::wrapping_offset`]
7212 * `CommandExt::creation_flags`
7213 * [`File::set_permissions`]
7214 * [`String::split_off`]
7219 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7220 their argument by `Borrow` parameter][37761]
7221 * [All public types in std implement `Debug`][38006]
7222 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7223 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7224 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7226 * [std: Fix partial writes in `LineWriter`][38062]
7227 * [std: Clamp max read/write sizes on Unix][38622]
7228 * [Use more specific panic message for `&str` slicing errors][38066]
7229 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7230 functionality cannot be achieved in std currently.
7231 * [`writeln!`, like `println!`, now accepts a form with no string
7232 or formatting arguments, to just print a newline][38469]
7233 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7234 * [Reduce the size of static data in `std_unicode::tables`][38781]
7235 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7236 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7238 * [`Duration` implements `Sum`][38712]
7239 * [`String` implements `ToSocketAddrs`][39048]
7244 * [The `cargo check` command does a type check of a project without
7245 building it][cargo/3296]
7246 * [crates.io will display CI badges from Travis and AppVeyor, if
7247 specified in Cargo.toml][cargo/3546]
7248 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7249 * [Compilation profiles accept integer values for `debug`, in addition
7250 to `true` and `false`. These are passed to `rustc` as the value to
7251 `-C debuginfo`][cargo/3534]
7252 * [Implement `cargo --version --verbose`][cargo/3604]
7253 * [All builds now output 'dep-info' build dependencies compatible with
7254 make and ninja][cargo/3557]
7255 * [Build all workspace members with `build --all`][cargo/3511]
7256 * [Document all workspace members with `doc --all`][cargo/3515]
7257 * [Path deps outside workspace are not members][cargo/3443]
7262 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7263 the path to the Rust implementation][38589]
7264 * [The `armv7-linux-androideabi` target no longer enables NEON
7265 extensions, per Google's ABI guide][38413]
7266 * [The stock standard library can be compiled for Redox OS][38401]
7267 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7269 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7271 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7276 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7277 match patterns][38069]
7278 * In this release, references to uninhabited types can not be
7279 pattern-matched. This was accidentally allowed in 1.15.
7280 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7281 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7283 * [Clean up semantics of `self` in an import list][38313]
7284 * Reimplemented lifetime elision. This change was almost entirely compatible
7285 with existing code, but it did close a number of small bugs and loopholes,
7286 as well as being more accepting in some other [cases][41105].
7288 [37057]: https://github.com/rust-lang/rust/pull/37057
7289 [37761]: https://github.com/rust-lang/rust/pull/37761
7290 [38006]: https://github.com/rust-lang/rust/pull/38006
7291 [38051]: https://github.com/rust-lang/rust/pull/38051
7292 [38062]: https://github.com/rust-lang/rust/pull/38062
7293 [38622]: https://github.com/rust-lang/rust/pull/38622
7294 [38066]: https://github.com/rust-lang/rust/pull/38066
7295 [38069]: https://github.com/rust-lang/rust/pull/38069
7296 [38131]: https://github.com/rust-lang/rust/pull/38131
7297 [38154]: https://github.com/rust-lang/rust/pull/38154
7298 [38274]: https://github.com/rust-lang/rust/pull/38274
7299 [38304]: https://github.com/rust-lang/rust/pull/38304
7300 [38313]: https://github.com/rust-lang/rust/pull/38313
7301 [38327]: https://github.com/rust-lang/rust/pull/38327
7302 [38401]: https://github.com/rust-lang/rust/pull/38401
7303 [38413]: https://github.com/rust-lang/rust/pull/38413
7304 [38469]: https://github.com/rust-lang/rust/pull/38469
7305 [38559]: https://github.com/rust-lang/rust/pull/38559
7306 [38571]: https://github.com/rust-lang/rust/pull/38571
7307 [38580]: https://github.com/rust-lang/rust/pull/38580
7308 [38589]: https://github.com/rust-lang/rust/pull/38589
7309 [38670]: https://github.com/rust-lang/rust/pull/38670
7310 [38712]: https://github.com/rust-lang/rust/pull/38712
7311 [38726]: https://github.com/rust-lang/rust/pull/38726
7312 [38781]: https://github.com/rust-lang/rust/pull/38781
7313 [38798]: https://github.com/rust-lang/rust/pull/38798
7314 [38909]: https://github.com/rust-lang/rust/pull/38909
7315 [38920]: https://github.com/rust-lang/rust/pull/38920
7316 [38927]: https://github.com/rust-lang/rust/pull/38927
7317 [39048]: https://github.com/rust-lang/rust/pull/39048
7318 [39282]: https://github.com/rust-lang/rust/pull/39282
7319 [39379]: https://github.com/rust-lang/rust/pull/39379
7320 [41105]: https://github.com/rust-lang/rust/issues/41105
7321 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7322 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7323 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7324 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7325 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7326 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7327 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7328 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7329 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7330 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7331 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7332 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7333 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7334 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7335 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7336 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7337 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7338 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7339 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7340 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7341 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7342 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7343 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7344 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7345 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7346 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7347 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7348 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7349 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7352 Version 1.15.1 (2017-02-09)
7353 ===========================
7355 * [Fix IntoIter::as_mut_slice's signature][39466]
7356 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7358 [39466]: https://github.com/rust-lang/rust/pull/39466
7359 [39523]: https://github.com/rust-lang/rust/pull/39523
7362 Version 1.15.0 (2017-02-02)
7363 ===========================
7368 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7369 stable. This allows popular code-generating crates like Serde and Diesel to
7370 work ergonomically. [RFC 1681].
7371 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7372 with curly braces][36868]. Part of [RFC 1506].
7373 * [A number of minor changes to name resolution have been activated][37127].
7374 They add up to more consistent semantics, allowing for future evolution of
7375 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7376 details of what is different. The breaking changes here have been transitioned
7377 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7378 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7380 * [`?Sized` can be used in `where` clauses][37791]
7381 * [There is now a limit on the size of monomorphized types and it can be
7382 modified with the `#![type_size_limit]` crate attribute, similarly to
7383 the `#![recursion_limit]` attribute][37789]
7388 * [On Windows, the compiler will apply dllimport attributes when linking to
7389 extern functions][37973]. Additional attributes and flags can control which
7390 library kind is linked and its name. [RFC 1717].
7391 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7392 * [The `--test` flag works with procedural macro crates][38107]
7393 * [Fix `extern "aapcs" fn` ABI][37814]
7394 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7395 * [The `format!` expander recognizes incorrect `printf` and shell-style
7396 formatting directives and suggests the correct format][37613].
7397 * [Only report one error for all unused imports in an import list][37456]
7399 Compiler Performance
7400 --------------------
7402 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7403 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7404 * [Don't clone in `UnificationTable::probe`][37848]
7405 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7406 * [Use small vectors in type walker][37760]
7407 * [Macro expansion performance was improved][37701]
7408 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7409 * [Replace FNV with a faster hash function][37229]
7414 * [`std::iter::Iterator::min_by`]
7415 * [`std::iter::Iterator::max_by`]
7416 * [`std::os::*::fs::FileExt`]
7417 * [`std::sync::atomic::Atomic*::get_mut`]
7418 * [`std::sync::atomic::Atomic*::into_inner`]
7419 * [`std::vec::IntoIter::as_slice`]
7420 * [`std::vec::IntoIter::as_mut_slice`]
7421 * [`std::sync::mpsc::Receiver::try_iter`]
7422 * [`std::os::unix::process::CommandExt::before_exec`]
7423 * [`std::rc::Rc::strong_count`]
7424 * [`std::rc::Rc::weak_count`]
7425 * [`std::sync::Arc::strong_count`]
7426 * [`std::sync::Arc::weak_count`]
7427 * [`std::char::encode_utf8`]
7428 * [`std::char::encode_utf16`]
7429 * [`std::cell::Ref::clone`]
7430 * [`std::io::Take::into_inner`]
7435 * [The standard sorting algorithm has been rewritten for dramatic performance
7436 improvements][38192]. It is a hybrid merge sort, drawing influences from
7437 Timsort. Previously it was a naive merge sort.
7438 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7439 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7441 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7442 and `char_indices().last()`][37882]
7443 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7444 * [Chinese characters display correctly in `fmt::Debug`][37855]
7445 * [Derive `Default` for `Duration`][37699]
7446 * [Support creation of anonymous pipes on WinXP/2k][37677]
7447 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7448 * [Don't pass overlapped handles to processes][38835]
7453 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7454 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7455 should instead check the variable at runtime with `std::env`. That the value
7456 was set at build time was a bug, and incorrect when cross-compiling. This
7457 change is known to cause breakage.
7458 * [Add `--all` flag to `cargo test`][cargo/3221]
7459 * [Compile statically against the MSVC CRT][cargo/3363]
7460 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7461 * [Link OpenSSL statically on OSX][cargo/3311]
7462 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7463 * [Test for bad path overrides with summaries][cargo/3336]
7464 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7465 * [Fix retrying crate downloads for network errors][cargo/3348]
7466 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7467 * [Emit more info on --message-format=json][cargo/3319]
7468 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7469 * [Don't ignore errors in workspace manifest][cargo/3409]
7470 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7475 * [Test runners (binaries built with `--test`) now support a `--list` argument
7476 that lists the tests it contains][38185]
7477 * [Test runners now support a `--exact` argument that makes the test filter
7478 match exactly, instead of matching only a substring of the test name][38181]
7479 * [rustdoc supports a `--playground-url` flag][37763]
7480 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7485 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7486 continue to be used in this release by passing `--disable-rustbuild` to the
7487 configure script, but they will be deleted soon. Note that the new build
7488 system uses a different on-disk layout that will likely affect any scripts
7490 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7492 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7493 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7499 * [A number of minor changes to name resolution have been activated][37127].
7500 They add up to more consistent semantics, allowing for future evolution of
7501 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7502 details of what is different. The breaking changes here have been transitioned
7503 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7504 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7505 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7506 should instead check the variable at runtime with `std::env`. That the value
7507 was set at build time was a bug, and incorrect when cross-compiling. This
7508 change is known to cause breakage.
7509 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7510 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7511 1.10 and is now an error by default. It will become a hard error in the near
7513 * [The semantics relating modules to file system directories are changing in
7514 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7515 lint, which is a warning in this release, and will become a hard error in the
7517 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7518 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7519 the underlying iterator][37834]
7521 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7522 [33685]: https://github.com/rust-lang/rust/issues/33685
7523 [36868]: https://github.com/rust-lang/rust/pull/36868
7524 [37127]: https://github.com/rust-lang/rust/pull/37127
7525 [37229]: https://github.com/rust-lang/rust/pull/37229
7526 [37456]: https://github.com/rust-lang/rust/pull/37456
7527 [37527]: https://github.com/rust-lang/rust/pull/37527
7528 [37602]: https://github.com/rust-lang/rust/pull/37602
7529 [37613]: https://github.com/rust-lang/rust/pull/37613
7530 [37615]: https://github.com/rust-lang/rust/pull/37615
7531 [37636]: https://github.com/rust-lang/rust/pull/37636
7532 [37627]: https://github.com/rust-lang/rust/pull/37627
7533 [37642]: https://github.com/rust-lang/rust/pull/37642
7534 [37677]: https://github.com/rust-lang/rust/pull/37677
7535 [37699]: https://github.com/rust-lang/rust/pull/37699
7536 [37701]: https://github.com/rust-lang/rust/pull/37701
7537 [37705]: https://github.com/rust-lang/rust/pull/37705
7538 [37749]: https://github.com/rust-lang/rust/pull/37749
7539 [37760]: https://github.com/rust-lang/rust/pull/37760
7540 [37763]: https://github.com/rust-lang/rust/pull/37763
7541 [37764]: https://github.com/rust-lang/rust/pull/37764
7542 [37789]: https://github.com/rust-lang/rust/pull/37789
7543 [37791]: https://github.com/rust-lang/rust/pull/37791
7544 [37814]: https://github.com/rust-lang/rust/pull/37814
7545 [37817]: https://github.com/rust-lang/rust/pull/37817
7546 [37834]: https://github.com/rust-lang/rust/pull/37834
7547 [37848]: https://github.com/rust-lang/rust/pull/37848
7548 [37855]: https://github.com/rust-lang/rust/pull/37855
7549 [37882]: https://github.com/rust-lang/rust/pull/37882
7550 [37888]: https://github.com/rust-lang/rust/pull/37888
7551 [37973]: https://github.com/rust-lang/rust/pull/37973
7552 [37979]: https://github.com/rust-lang/rust/pull/37979
7553 [38086]: https://github.com/rust-lang/rust/pull/38086
7554 [38107]: https://github.com/rust-lang/rust/pull/38107
7555 [38117]: https://github.com/rust-lang/rust/pull/38117
7556 [38134]: https://github.com/rust-lang/rust/pull/38134
7557 [38146]: https://github.com/rust-lang/rust/pull/38146
7558 [38181]: https://github.com/rust-lang/rust/pull/38181
7559 [38182]: https://github.com/rust-lang/rust/pull/38182
7560 [38185]: https://github.com/rust-lang/rust/pull/38185
7561 [38192]: https://github.com/rust-lang/rust/pull/38192
7562 [38279]: https://github.com/rust-lang/rust/pull/38279
7563 [38835]: https://github.com/rust-lang/rust/pull/38835
7564 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7565 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7566 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7567 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7568 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7569 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7570 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7571 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7572 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7573 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7574 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7575 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7576 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7577 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7578 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7579 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7580 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7581 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7582 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7583 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7584 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7585 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7586 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7587 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7588 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7589 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7590 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7591 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7592 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7593 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7594 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7595 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7596 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7597 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7598 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7599 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7600 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7603 Version 1.14.0 (2016-12-22)
7604 ===========================
7609 * [`..` matches multiple tuple fields in enum variants, structs
7610 and tuples][36843]. [RFC 1492].
7611 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7612 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7613 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7614 dereferencing][36822]
7619 * [Mark enums with non-zero discriminant as non-zero][37224]
7620 * [Lower-case `static mut` names are linted like other
7621 statics and consts][37162]
7622 * [Fix ICE on some macros in const integer positions
7623 (e.g. `[u8; m!()]`)][36819]
7624 * [Improve error message and snippet for "did you mean `x`"][36798]
7625 * [Add a panic-strategy field to the target specification][36794]
7626 * [Include LLVM version in `--version --verbose`][37200]
7628 Compile-time Optimizations
7629 --------------------------
7631 * [Improve macro expansion performance][37569]
7632 * [Shrink `Expr_::ExprInlineAsm`][37445]
7633 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7634 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7635 * [Avoid more allocations when compiling html5ever][37373]
7636 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7637 * [Avoid some allocations in the macro parser][37318]
7638 * [Use a faster deflate setting][37298]
7639 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7640 during interning of slices][37270]
7641 * [Optimize `write_metadata`][37267]
7642 * [Don't process obligation forest cycles when stalled][37231]
7643 * [Avoid many `CrateConfig` clones][37161]
7644 * [Optimize `Substs::super_fold_with`][37108]
7645 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7646 * [Speed up `plug_leaks`][36917]
7651 * [`println!()`, with no arguments, prints newline][36825].
7652 Previously, an empty string was required to achieve the same.
7653 * [`Wrapping` impls standard binary and unary operators, as well as
7654 the `Sum` and `Product` iterators][37356]
7655 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7657 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7658 `VecDeque` iterators][37315]
7659 * [Improve `SipHasher` performance on small values][37312]
7660 * [Add Iterator trait TrustedLen to enable better FromIterator /
7662 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7663 * [`ReadDir` implements `Debug`][37221]
7664 * [Implement `RefUnwindSafe` for atomic types][37178]
7665 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7666 * [Avoid allocations in `Decoder::read_str`][37064]
7667 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7668 * [Impl `Debug` for raw pointers to unsized data][36880]
7669 * [Don't reuse `HashMap` random seeds][37470]
7670 * [The internal memory layout of `HashMap` is more cache-friendly, for
7671 significant improvements in some operations][36692]
7672 * [`HashMap` uses less memory on 32-bit architectures][36595]
7673 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7678 * [Expose rustc cfg values to build scripts][cargo/3243]
7679 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7680 * [Fix passing --features when testing multiple packages][cargo/3280]
7681 * [Use a single profile set per workspace][cargo/3249]
7682 * [Load `replace` sections from lock files][cargo/3220]
7683 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7688 * [rustup is the recommended Rust installation method][1.14rustup]
7689 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7690 S390x. These are [tier 2] platforms and may have major defects. Follow the
7691 instructions on the website to install, or add the targets to an existing
7692 installation with `rustup target add`. The new target triples are:
7693 - `mips-unknown-linux-gnu`
7694 - `mipsel-unknown-linux-gnu`
7695 - `mips64-unknown-linux-gnuabi64`
7696 - `mips64el-unknown-linux-gnuabi64 `
7697 - `powerpc-unknown-linux-gnu`
7698 - `powerpc64-unknown-linux-gnu`
7699 - `powerpc64le-unknown-linux-gnu`
7700 - `s390x-unknown-linux-gnu `
7701 * This release includes target (std) builds for ARM Linux running MUSL
7702 libc. These are [tier 2] platforms and may have major defects. Add the
7703 following triples to an existing rustup installation with `rustup target add`:
7704 - `arm-unknown-linux-musleabi`
7705 - `arm-unknown-linux-musleabihf`
7706 - `armv7-unknown-linux-musleabihf`
7707 * This release includes [experimental support for WebAssembly][1.14wasm], via
7708 the `wasm32-unknown-emscripten` target. This target is known to have major
7709 defects. Please test, report, and fix.
7710 * rustup no longer installs documentation by default. Run `rustup
7711 component add rust-docs` to install.
7712 * [Fix line stepping in debugger][37310]
7713 * [Enable line number debuginfo in releases][37280]
7718 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7719 * [Add support for Fuchsia OS][37313]
7720 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7725 * [A number of forward-compatibility lints used by the compiler
7726 to gradually introduce language changes have been converted
7727 to deny by default][36894]:
7728 - ["use of inaccessible extern crate erroneously allowed"][36886]
7729 - ["type parameter default erroneously allowed in invalid location"][36887]
7730 - ["detects super or self keywords at the beginning of global path"][36888]
7731 - ["two overlapping inherent impls define an item with the same name
7732 were erroneously allowed"][36889]
7733 - ["floating-point constants cannot be used in patterns"][36890]
7734 - ["constants of struct or enum type can only be used in a pattern if
7735 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7736 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7737 * [Prohibit patterns in trait methods without bodies][37378]
7738 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7739 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7740 * [The `$crate` macro variable is accepted in fewer locations][37213]
7741 * [Impls specifying extra region requirements beyond the trait
7742 they implement are rejected][37167]
7743 * [Enums may not be unsized][37111]. Unsized enums are intended to
7744 work but never have. For now they are forbidden.
7745 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7747 [tier 2]: https://forge.rust-lang.org/platform-support.html
7748 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7749 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7750 [36430]: https://github.com/rust-lang/rust/pull/36430
7751 [36595]: https://github.com/rust-lang/rust/pull/36595
7752 [36692]: https://github.com/rust-lang/rust/pull/36692
7753 [36767]: https://github.com/rust-lang/rust/pull/36767
7754 [36794]: https://github.com/rust-lang/rust/pull/36794
7755 [36798]: https://github.com/rust-lang/rust/pull/36798
7756 [36819]: https://github.com/rust-lang/rust/pull/36819
7757 [36822]: https://github.com/rust-lang/rust/pull/36822
7758 [36825]: https://github.com/rust-lang/rust/pull/36825
7759 [36843]: https://github.com/rust-lang/rust/pull/36843
7760 [36880]: https://github.com/rust-lang/rust/pull/36880
7761 [36886]: https://github.com/rust-lang/rust/issues/36886
7762 [36887]: https://github.com/rust-lang/rust/issues/36887
7763 [36888]: https://github.com/rust-lang/rust/issues/36888
7764 [36889]: https://github.com/rust-lang/rust/issues/36889
7765 [36890]: https://github.com/rust-lang/rust/issues/36890
7766 [36891]: https://github.com/rust-lang/rust/issues/36891
7767 [36892]: https://github.com/rust-lang/rust/issues/36892
7768 [36894]: https://github.com/rust-lang/rust/pull/36894
7769 [36917]: https://github.com/rust-lang/rust/pull/36917
7770 [36993]: https://github.com/rust-lang/rust/pull/36993
7771 [37037]: https://github.com/rust-lang/rust/pull/37037
7772 [37064]: https://github.com/rust-lang/rust/pull/37064
7773 [37094]: https://github.com/rust-lang/rust/pull/37094
7774 [37108]: https://github.com/rust-lang/rust/pull/37108
7775 [37111]: https://github.com/rust-lang/rust/pull/37111
7776 [37161]: https://github.com/rust-lang/rust/pull/37161
7777 [37162]: https://github.com/rust-lang/rust/pull/37162
7778 [37167]: https://github.com/rust-lang/rust/pull/37167
7779 [37178]: https://github.com/rust-lang/rust/pull/37178
7780 [37200]: https://github.com/rust-lang/rust/pull/37200
7781 [37213]: https://github.com/rust-lang/rust/pull/37213
7782 [37221]: https://github.com/rust-lang/rust/pull/37221
7783 [37224]: https://github.com/rust-lang/rust/pull/37224
7784 [37230]: https://github.com/rust-lang/rust/pull/37230
7785 [37231]: https://github.com/rust-lang/rust/pull/37231
7786 [37247]: https://github.com/rust-lang/rust/pull/37247
7787 [37267]: https://github.com/rust-lang/rust/pull/37267
7788 [37270]: https://github.com/rust-lang/rust/pull/37270
7789 [37273]: https://github.com/rust-lang/rust/pull/37273
7790 [37280]: https://github.com/rust-lang/rust/pull/37280
7791 [37298]: https://github.com/rust-lang/rust/pull/37298
7792 [37306]: https://github.com/rust-lang/rust/pull/37306
7793 [37310]: https://github.com/rust-lang/rust/pull/37310
7794 [37312]: https://github.com/rust-lang/rust/pull/37312
7795 [37313]: https://github.com/rust-lang/rust/pull/37313
7796 [37315]: https://github.com/rust-lang/rust/pull/37315
7797 [37318]: https://github.com/rust-lang/rust/pull/37318
7798 [37322]: https://github.com/rust-lang/rust/pull/37322
7799 [37326]: https://github.com/rust-lang/rust/pull/37326
7800 [37351]: https://github.com/rust-lang/rust/pull/37351
7801 [37356]: https://github.com/rust-lang/rust/pull/37356
7802 [37367]: https://github.com/rust-lang/rust/pull/37367
7803 [37373]: https://github.com/rust-lang/rust/pull/37373
7804 [37378]: https://github.com/rust-lang/rust/pull/37378
7805 [37389]: https://github.com/rust-lang/rust/pull/37389
7806 [37392]: https://github.com/rust-lang/rust/pull/37392
7807 [37427]: https://github.com/rust-lang/rust/pull/37427
7808 [37439]: https://github.com/rust-lang/rust/pull/37439
7809 [37445]: https://github.com/rust-lang/rust/pull/37445
7810 [37470]: https://github.com/rust-lang/rust/pull/37470
7811 [37569]: https://github.com/rust-lang/rust/pull/37569
7812 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7813 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7814 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7815 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7816 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7817 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7818 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7821 Version 1.13.0 (2016-11-10)
7822 ===========================
7827 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7828 errors, like the `try!` macro, described in [RFC 0243].
7829 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7830 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7831 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7832 * [Fix lifetime rules for 'if' conditions][36029]
7833 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7838 * [Add the `-C link-arg` argument][36574]
7839 * [Remove the old AST-based backend from rustc_trans][35764]
7840 * [Don't enable NEON by default on armv7 Linux][35814]
7841 * [Fix debug line number info for macro expansions][35238]
7842 * [Do not emit "class method" debuginfo for types that are not
7843 DICompositeType][36008]
7844 * [Warn about multiple conflicting #[repr] hints][34623]
7845 * [When sizing DST, don't double-count nested struct prefixes][36351]
7846 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7847 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7848 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7849 * [Expand macros without recursing to avoid stack overflows][36214]
7854 * [Replace macro backtraces with labeled local uses][35702]
7855 * [Improve error message for misplaced doc comments][33922]
7856 * [Buffer unix and lock windows to prevent message interleaving][35975]
7857 * [Update lifetime errors to specifically note temporaries][36171]
7858 * [Special case a few colors for Windows][36178]
7859 * [Suggest `use self` when such an import resolves][36289]
7860 * [Be more specific when type parameter shadows primitive type][36338]
7861 * Many minor improvements
7863 Compile-time Optimizations
7864 --------------------------
7866 * [Compute and cache HIR hashes at beginning][35854]
7867 * [Don't hash types in loan paths][36004]
7868 * [Cache projections in trans][35761]
7869 * [Optimize the parser's last token handling][36527]
7870 * [Only instantiate #[inline] functions in codegen units referencing
7871 them][36524]. This leads to big improvements in cases where crates export
7872 define many inline functions without using them directly.
7873 * [Lazily allocate TypedArena's first chunk][36592]
7874 * [Don't allocate during default HashSet creation][36734]
7881 * [`overflowing_abs`]
7882 * [`RefCell::try_borrow`]
7883 * [`RefCell::try_borrow_mut`]
7888 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7889 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7891 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7892 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7893 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7894 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7895 * [Use arc4rand on FreeBSD][35884]
7896 * [memrchr: Correct aligned offset computation][35969]
7897 * [Improve Demangling of Rust Symbols][36059]
7898 * [Use monotonic time in condition variables][35048]
7899 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7900 * [Implement conversion traits for `char`][35755]
7901 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7902 * [Zero first byte of CString on drop][36264]
7903 * [Inherit overflow checks for sum and product][36372]
7904 * [Add missing Eq implementations][36423]
7905 * [Implement `Debug` for `DirEntry`][36631]
7906 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7908 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7909 * [Implement more traits for `std::io::ErrorKind`][35911]
7910 * [Optimize BinaryHeap bounds checking][36072]
7911 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7912 `extend_with_element`][36355]
7913 * [Fix overflow checking in unsigned pow()][34942]
7918 * This release includes security fixes to both curl and OpenSSL.
7919 * [Fix transitive doctests when panic=abort][cargo/3021]
7920 * [Add --all-features flag to cargo][cargo/3038]
7921 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7922 * [Don't parse the home directory more than once][cargo/3078]
7923 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7924 * [Update OpenSSL to 1.0.2j][cargo/3121]
7925 * [Add license and license_file to cargo metadata output][cargo/3110]
7926 * [Make crates-io registry URL optional in config; ignore all changes to
7927 source.crates-io][cargo/3089]
7928 * [Don't download dependencies from other platforms][cargo/3123]
7929 * [Build transitive dev-dependencies when needed][cargo/3125]
7930 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7931 * [Avoid updating registry when adding existing deps][cargo/3144]
7932 * [Warn about path overrides that won't work][cargo/3136]
7933 * [Use workspaces during `cargo install`][cargo/3146]
7934 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7935 * [Add --message-format flag][cargo/3000]
7936 * [Pass target environment for rustdoc][cargo/3205]
7937 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7938 * [Update curl and curl-sys][cargo/3241]
7939 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7944 * [rustdoc: Add the `--sysroot` argument][36586]
7945 * [rustdoc: Fix a couple of issues with the search results][35655]
7946 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7947 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7948 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7953 * [Remove unmaintained style guide][35124]
7954 * [Add s390x support][36369]
7955 * [Initial work at Haiku OS support][36727]
7956 * [Add mips-uclibc targets][35734]
7957 * [Crate-ify compiler-rt into compiler-builtins][35021]
7958 * [Add rustc version info (git hash + date) to dist tarball][36213]
7959 * Many documentation improvements
7964 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7965 * [Deny (by default) transmuting from fn item types to pointer-sized
7966 types][34923]. Continuing the long transition to zero-sized fn items,
7968 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7970 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7971 * [Fix lifetime rules for 'if' conditions][36029].
7972 * [Inherit overflow checks for sum and product][36372].
7973 * [Forbid user-defined macros named "macro_rules"][36730].
7975 [33922]: https://github.com/rust-lang/rust/pull/33922
7976 [34623]: https://github.com/rust-lang/rust/pull/34623
7977 [34923]: https://github.com/rust-lang/rust/pull/34923
7978 [34942]: https://github.com/rust-lang/rust/pull/34942
7979 [35021]: https://github.com/rust-lang/rust/pull/35021
7980 [35048]: https://github.com/rust-lang/rust/pull/35048
7981 [35074]: https://github.com/rust-lang/rust/pull/35074
7982 [35124]: https://github.com/rust-lang/rust/pull/35124
7983 [35234]: https://github.com/rust-lang/rust/pull/35234
7984 [35238]: https://github.com/rust-lang/rust/pull/35238
7985 [35354]: https://github.com/rust-lang/rust/pull/35354
7986 [35559]: https://github.com/rust-lang/rust/pull/35559
7987 [35585]: https://github.com/rust-lang/rust/pull/35585
7988 [35627]: https://github.com/rust-lang/rust/pull/35627
7989 [35655]: https://github.com/rust-lang/rust/pull/35655
7990 [35702]: https://github.com/rust-lang/rust/pull/35702
7991 [35707]: https://github.com/rust-lang/rust/pull/35707
7992 [35728]: https://github.com/rust-lang/rust/pull/35728
7993 [35734]: https://github.com/rust-lang/rust/pull/35734
7994 [35755]: https://github.com/rust-lang/rust/pull/35755
7995 [35761]: https://github.com/rust-lang/rust/pull/35761
7996 [35764]: https://github.com/rust-lang/rust/pull/35764
7997 [35814]: https://github.com/rust-lang/rust/pull/35814
7998 [35854]: https://github.com/rust-lang/rust/pull/35854
7999 [35871]: https://github.com/rust-lang/rust/pull/35871
8000 [35884]: https://github.com/rust-lang/rust/pull/35884
8001 [35911]: https://github.com/rust-lang/rust/pull/35911
8002 [35969]: https://github.com/rust-lang/rust/pull/35969
8003 [35975]: https://github.com/rust-lang/rust/pull/35975
8004 [36004]: https://github.com/rust-lang/rust/pull/36004
8005 [36008]: https://github.com/rust-lang/rust/pull/36008
8006 [36014]: https://github.com/rust-lang/rust/pull/36014
8007 [36029]: https://github.com/rust-lang/rust/pull/36029
8008 [36059]: https://github.com/rust-lang/rust/pull/36059
8009 [36072]: https://github.com/rust-lang/rust/pull/36072
8010 [36101]: https://github.com/rust-lang/rust/pull/36101
8011 [36104]: https://github.com/rust-lang/rust/pull/36104
8012 [36171]: https://github.com/rust-lang/rust/pull/36171
8013 [36173]: https://github.com/rust-lang/rust/pull/36173
8014 [36178]: https://github.com/rust-lang/rust/pull/36178
8015 [36213]: https://github.com/rust-lang/rust/pull/36213
8016 [36214]: https://github.com/rust-lang/rust/pull/36214
8017 [36264]: https://github.com/rust-lang/rust/pull/36264
8018 [36266]: https://github.com/rust-lang/rust/pull/36266
8019 [36289]: https://github.com/rust-lang/rust/pull/36289
8020 [36338]: https://github.com/rust-lang/rust/pull/36338
8021 [36351]: https://github.com/rust-lang/rust/pull/36351
8022 [36355]: https://github.com/rust-lang/rust/pull/36355
8023 [36369]: https://github.com/rust-lang/rust/pull/36369
8024 [36372]: https://github.com/rust-lang/rust/pull/36372
8025 [36423]: https://github.com/rust-lang/rust/pull/36423
8026 [36482]: https://github.com/rust-lang/rust/pull/36482
8027 [36505]: https://github.com/rust-lang/rust/pull/36505
8028 [36524]: https://github.com/rust-lang/rust/pull/36524
8029 [36527]: https://github.com/rust-lang/rust/pull/36527
8030 [36551]: https://github.com/rust-lang/rust/pull/36551
8031 [36574]: https://github.com/rust-lang/rust/pull/36574
8032 [36586]: https://github.com/rust-lang/rust/pull/36586
8033 [36592]: https://github.com/rust-lang/rust/pull/36592
8034 [36631]: https://github.com/rust-lang/rust/pull/36631
8035 [36721]: https://github.com/rust-lang/rust/pull/36721
8036 [36727]: https://github.com/rust-lang/rust/pull/36727
8037 [36730]: https://github.com/rust-lang/rust/pull/36730
8038 [36734]: https://github.com/rust-lang/rust/pull/36734
8039 [36754]: https://github.com/rust-lang/rust/pull/36754
8040 [36995]: https://github.com/rust-lang/rust/pull/36995
8041 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
8042 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
8043 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
8044 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
8045 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
8046 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
8047 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
8048 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
8049 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
8050 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
8051 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
8052 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
8053 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
8054 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
8055 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
8056 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
8057 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
8058 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
8059 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
8060 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
8061 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
8062 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
8063 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
8064 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
8065 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
8066 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
8067 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
8068 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
8069 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
8070 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
8071 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
8072 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
8075 Version 1.12.1 (2016-10-20)
8076 ===========================
8081 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
8082 * [Confusion with double negation and booleans][36856]
8083 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
8084 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
8085 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
8086 * [Corrupted memory after updated to 1.12][36936]
8087 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
8088 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
8089 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
8091 [36381]: https://github.com/rust-lang/rust/issues/36381
8092 [36856]: https://github.com/rust-lang/rust/issues/36856
8093 [36875]: https://github.com/rust-lang/rust/issues/36875
8094 [36924]: https://github.com/rust-lang/rust/issues/36924
8095 [36926]: https://github.com/rust-lang/rust/issues/36926
8096 [36936]: https://github.com/rust-lang/rust/issues/36936
8097 [37026]: https://github.com/rust-lang/rust/issues/37026
8098 [37112]: https://github.com/rust-lang/rust/issues/37112
8099 [37153]: https://github.com/rust-lang/rust/issues/37153
8102 Version 1.12.0 (2016-09-29)
8103 ===========================
8108 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8109 This translation pass is far simpler than the previous AST->LLVM pass, and
8110 creates opportunities to perform new optimizations directly on the MIR. It
8111 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8112 * [`rustc` presents a new, more readable error format, along with
8113 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8114 Most common editors supporting Rust have been updated to work with it. It was
8115 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8120 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8121 This translation pass is far simpler than the previous AST->LLVM pass, and
8122 creates opportunities to perform new optimizations directly on the MIR. It
8123 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8124 * [Print the Rust target name, not the LLVM target name, with
8125 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8126 * [The computation of `TypeId` is correct in some cases where it was previously
8127 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8128 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8129 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8130 `--print relocation-models`, and `--print code-models` print the available
8131 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8132 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8133 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8134 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8135 These targets produce statically-linked binaries. There are no binary release
8141 * [`rustc` presents a new, more readable error format, along with
8142 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8143 Most common editors supporting Rust have been updated to work with it. It was
8144 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8145 * [In error descriptions, references are now described in plain English,
8146 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8147 * [In error type descriptions, unknown numeric types are named `{integer}` or
8148 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8149 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8154 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8155 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8156 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8157 useful](https://github.com/rust-lang/rust/pull/34908)
8158 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8159 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8160 * [Semicolons are properly required as statement delimiters inside
8161 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8162 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8167 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8168 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8169 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8170 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8171 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8172 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8173 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8174 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8175 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8176 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8177 Both on Unix and Windows.
8178 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8179 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8180 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8181 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8182 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8183 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8184 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8185 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8190 * [The `format!` macro and friends now allow a single argument to be formatted
8191 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8192 * [The lifetime bounds on `[T]::binary_search_by` and
8193 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8194 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8195 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8196 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8197 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8198 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8199 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8200 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8201 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8202 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8203 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8204 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8205 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8206 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8207 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8208 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8209 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8210 * [`mpsc::sync_channel` `Receiver`s return any available message before
8211 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8212 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8213 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8218 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8219 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8220 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8221 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8222 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8223 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8224 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8225 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8226 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8227 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8228 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8229 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8230 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8231 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8232 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8233 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8238 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8239 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8244 * [Test binaries now support a `--test-threads` argument to specify the number
8245 of threads used to run tests, and which acts the same as the
8246 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8247 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8248 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8249 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8250 * [Rust releases now come with source packages that can be installed by rustup
8251 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8252 The resulting source code can be used by tools and IDES, located in the
8253 sysroot under `lib/rustlib/src`.
8258 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8259 * Many minor improvements to the documentation.
8260 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8265 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8266 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8267 * [When formatting strings, if "precision" is specified, the "fill",
8268 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8269 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8272 Version 1.11.0 (2016-08-18)
8273 ===========================
8278 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8279 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8280 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8281 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8286 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8287 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8288 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8289 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8290 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8291 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8292 (in libcore - previously stabilized in libstd)
8293 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8294 (in libcore - previously stabilized in libstd)
8295 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8296 (in libcore - previously stabilized in libstd)
8297 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8298 (in libcore - previously stabilized in libstd)
8299 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8300 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8301 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8302 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8307 * [The `thread_local!` macro supports multiple definitions in a single
8308 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8309 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8310 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8311 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8312 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8313 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8314 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8315 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8320 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8321 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8322 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8323 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8324 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8325 and `-vv` prints warnings for all crates.
8326 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8327 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8328 This provides room for expansion by arbitrary tools.
8329 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8330 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8331 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8332 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8333 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8334 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8335 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8340 * [Caching projections speeds up type check dramatically for some
8341 workloads](https://github.com/rust-lang/rust/pull/33816)
8342 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8343 This hasher is faster, but is believed to provide sufficient
8344 protection from collision attacks.
8345 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8350 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8351 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8352 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8353 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8354 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8359 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8360 * [When emitting debug info, rustc emits frame pointers for closures,
8361 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8362 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8363 * Many more errors have been given error codes and extended
8365 * API documentation continues to be improved, with many new examples
8370 * [rustc no longer hangs when dependencies recursively re-export
8371 submodules](https://github.com/rust-lang/rust/pull/34542)
8372 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8373 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8374 rewritten](https://github.com/rust-lang/rust/pull/33895)
8375 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8376 No targets use this yet, but it works toward AVR support.
8381 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8382 * [The new follow-set rules that place restrictions on `macro_rules!`
8383 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8384 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8385 and has been a warning since 1.10.
8386 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8387 This causes breakage in some corner cases.
8390 Version 1.10.0 (2016-07-07)
8391 ===========================
8396 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8397 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8398 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8399 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8400 * [`panic!` can be converted to a runtime abort with the
8401 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8402 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8403 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8404 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8405 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8406 Note that Cargo does not yet directly support cdylibs.
8411 * `os::windows::fs::OpenOptionsExt::access_mode`
8412 * `os::windows::fs::OpenOptionsExt::share_mode`
8413 * `os::windows::fs::OpenOptionsExt::custom_flags`
8414 * `os::windows::fs::OpenOptionsExt::attributes`
8415 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8416 * `os::unix::fs::OpenOptionsExt::custom_flags`
8417 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8418 * `Default for sync::Weak`
8419 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8420 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8421 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8422 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8423 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8424 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8425 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8426 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8427 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8428 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8429 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8430 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8431 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8432 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8433 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8434 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8435 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8436 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8437 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8438 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8439 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8440 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8441 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8442 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8443 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8444 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8445 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8446 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8447 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8448 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8449 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8450 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8451 * Read/Write/RawFd impls for `UnixStream`
8452 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8453 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8454 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8455 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8456 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8457 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8458 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8459 * RawFd impls for `UnixListener`
8460 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8461 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8462 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8463 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8464 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8465 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8466 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8467 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8468 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8469 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8470 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8471 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8472 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8473 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8474 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8475 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8476 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8477 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8478 * RawFd impls for `UnixDatagram`
8479 * `{BTree,Hash}Map::values_mut`
8480 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8485 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8486 The semantics of this minor method are subtle and probably not what
8488 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8489 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8490 will fall back to `/dev/urandom` temporarily to avoid blocking
8491 during early boot](https://github.com/rust-lang/rust/pull/33086).
8492 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8493 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8494 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8495 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8496 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8497 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8498 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8502 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8503 This controls the runtime behavior of the `panic!` macro
8504 and can be either "unwind" (the default), or "abort".
8505 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8506 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8507 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8508 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8509 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8510 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8511 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8512 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8513 By default they are retried twice, which can be customized with the
8514 `net.retry` value in `.cargo/config`.
8515 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8516 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8517 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8518 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8519 Makes it possible to install multiple crates in parallel.
8520 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8521 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8522 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8523 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8524 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8525 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8530 * [rustc memory usage was reduced by refactoring the context used for
8531 type checking](https://github.com/rust-lang/rust/pull/33425).
8532 * [Speed up creation of `HashMap`s by caching the random keys used
8533 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8534 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8535 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8536 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8537 10x faster than the previous lookup tables.
8538 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8543 * Many incremental improvements to documentation and rustdoc.
8544 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8545 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8546 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8547 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8548 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8549 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8550 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8555 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8556 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8557 * [`std` no longer prints backtraces on platforms where the running
8558 module must be loaded with `env::current_exe`, which can't be relied
8559 on](https://github.com/rust-lang/rust/pull/33554).
8560 * This release includes std binaries for the i586-unknown-linux-gnu,
8561 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8562 i586 target is for old x86 hardware without SSE2, and the armv7
8563 target is for Android running on modern ARM architectures.
8564 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8565 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8566 * [On Unix the runtime aborts by calling `libc::abort` instead of
8567 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8568 * [Rust is now bootstrapped from the previous release of Rust,
8569 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8574 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8575 * [`target_env` for Linux ARM targets is just `gnu`, not
8576 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8577 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8578 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8579 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8580 Affects how macros are parsed.
8581 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8582 * [Feature-gated attributes on macro-generated macro invocations are
8583 now rejected](https://github.com/rust-lang/rust/pull/32791).
8584 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8585 This caused some minor changes to type inference.
8588 Version 1.9.0 (2016-05-26)
8589 ==========================
8594 * The `#[deprecated]` attribute when applied to an API will generate
8595 warnings when used. The warnings may be suppressed with
8596 `#[allow(deprecated)]`. [RFC 1270].
8597 * [`fn` item types are zero sized, and each `fn` names a unique
8598 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8599 `transmute` on a `fn` type will generate a warning for a few cycles,
8600 then will be converted to an error.
8601 * [Field and method resolution understand visibility, so private
8602 fields and methods cannot prevent the proper use of public fields
8603 and methods][1.9fv].
8604 * [The parser considers unicode codepoints in the
8605 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8611 * [`std::panic::catch_unwind`] (renamed from `recover`)
8612 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8613 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8614 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8615 * [`str::is_char_boundary`]
8616 * [`<*const T>::as_ref`]
8617 * [`<*mut T>::as_ref`]
8618 * [`<*mut T>::as_mut`]
8619 * [`AsciiExt::make_ascii_uppercase`]
8620 * [`AsciiExt::make_ascii_lowercase`]
8621 * [`char::decode_utf16`]
8622 * [`char::DecodeUtf16`]
8623 * [`char::DecodeUtf16Error`]
8624 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8625 * [`BTreeSet::take`]
8626 * [`BTreeSet::replace`]
8629 * [`HashSet::replace`]
8631 * [`OsString::with_capacity`]
8632 * [`OsString::clear`]
8633 * [`OsString::capacity`]
8634 * [`OsString::reserve`]
8635 * [`OsString::reserve_exact`]
8636 * [`OsStr::is_empty`]
8638 * [`std::os::unix::thread`]
8641 * [`JoinHandleExt::as_pthread_t`]
8642 * [`JoinHandleExt::into_pthread_t`]
8643 * [`HashSet::hasher`]
8644 * [`HashMap::hasher`]
8645 * [`CommandExt::exec`]
8646 * [`File::try_clone`]
8647 * [`SocketAddr::set_ip`]
8648 * [`SocketAddr::set_port`]
8649 * [`SocketAddrV4::set_ip`]
8650 * [`SocketAddrV4::set_port`]
8651 * [`SocketAddrV6::set_ip`]
8652 * [`SocketAddrV6::set_port`]
8653 * [`SocketAddrV6::set_flowinfo`]
8654 * [`SocketAddrV6::set_scope_id`]
8655 * [`slice::copy_from_slice`]
8656 * [`ptr::read_volatile`]
8657 * [`ptr::write_volatile`]
8658 * [`OpenOptions::create_new`]
8659 * [`TcpStream::set_nodelay`]
8660 * [`TcpStream::nodelay`]
8661 * [`TcpStream::set_ttl`]
8662 * [`TcpStream::ttl`]
8663 * [`TcpStream::set_only_v6`]
8664 * [`TcpStream::only_v6`]
8665 * [`TcpStream::take_error`]
8666 * [`TcpStream::set_nonblocking`]
8667 * [`TcpListener::set_ttl`]
8668 * [`TcpListener::ttl`]
8669 * [`TcpListener::set_only_v6`]
8670 * [`TcpListener::only_v6`]
8671 * [`TcpListener::take_error`]
8672 * [`TcpListener::set_nonblocking`]
8673 * [`UdpSocket::set_broadcast`]
8674 * [`UdpSocket::broadcast`]
8675 * [`UdpSocket::set_multicast_loop_v4`]
8676 * [`UdpSocket::multicast_loop_v4`]
8677 * [`UdpSocket::set_multicast_ttl_v4`]
8678 * [`UdpSocket::multicast_ttl_v4`]
8679 * [`UdpSocket::set_multicast_loop_v6`]
8680 * [`UdpSocket::multicast_loop_v6`]
8681 * [`UdpSocket::set_multicast_ttl_v6`]
8682 * [`UdpSocket::multicast_ttl_v6`]
8683 * [`UdpSocket::set_ttl`]
8684 * [`UdpSocket::ttl`]
8685 * [`UdpSocket::set_only_v6`]
8686 * [`UdpSocket::only_v6`]
8687 * [`UdpSocket::join_multicast_v4`]
8688 * [`UdpSocket::join_multicast_v6`]
8689 * [`UdpSocket::leave_multicast_v4`]
8690 * [`UdpSocket::leave_multicast_v6`]
8691 * [`UdpSocket::take_error`]
8692 * [`UdpSocket::connect`]
8693 * [`UdpSocket::send`]
8694 * [`UdpSocket::recv`]
8695 * [`UdpSocket::set_nonblocking`]
8700 * [`std::sync::Once` is poisoned if its initialization function
8702 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8703 * [Most types implement `fmt::Debug`][1.9db].
8704 * [The default buffer size used by `BufReader` and `BufWriter` was
8705 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8706 used by other languages.
8707 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8708 `Duration` additionally implements `*=` and `/=`][1.9ta].
8709 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8710 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8711 * [`Chain` implements `BufRead`][1.9ch].
8712 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8717 * [Cargo can now run concurrently][1.9cc].
8718 * [Top-level overrides allow specific revisions of crates to be
8719 overridden through the entire crate graph][1.9ct]. This is intended
8720 to make upgrades easier for large projects, by allowing crates to be
8721 forked temporarily until they've been upgraded and republished.
8722 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8723 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8724 on the commandline][1.9cf]. `rustc` arguments can also be specified
8725 in the `build.rustflags` configuration key.
8730 * [The time complexity of comparing variables for equivalence during type
8731 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8732 to major compilation time improvement in some scenarios.
8733 * [`ToString` is specialized for `str`, giving it the same performance
8734 as `to_owned`][1.9ts].
8735 * [Spawning processes with `Command::output` no longer creates extra
8737 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8738 for C-like enums][1.9cl].
8743 * [Passing the `--quiet` flag to a test runner will produce
8744 much-abbreviated output][1.9q].
8745 * The Rust Project now publishes std binaries for the
8746 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8747 `i586-pc-windows-msvc` targets.
8752 * [`std::sync::Once` is poisoned if its initialization function
8754 * [It is illegal to define methods with the same name in overlapping
8755 inherent `impl` blocks][1.9sn].
8756 * [`fn` item types are zero sized, and each `fn` names a unique
8757 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8758 `transmute` on a `fn` type will generate a warning for a few cycles,
8759 then will be converted to an error.
8760 * [Improvements to const evaluation may trigger new errors when integer
8761 literals are out of range][1.9ce].
8764 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8765 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8766 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8767 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8768 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8769 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8770 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8771 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8772 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8773 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8774 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8775 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8776 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8777 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8778 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8779 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8780 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8781 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8782 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8783 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8784 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8785 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8786 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8787 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8788 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8789 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8790 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8791 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8792 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8793 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8794 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8795 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8796 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8797 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8798 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8799 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8800 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8801 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8802 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8803 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8804 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8805 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8806 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8807 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8808 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8809 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8810 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8811 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8812 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8813 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8814 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8815 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8816 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8817 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8818 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8819 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8820 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8821 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8822 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8823 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8824 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8825 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8826 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8827 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8828 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8829 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8830 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8831 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8832 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8833 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8834 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8835 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8836 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8837 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8838 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8839 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8840 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8841 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8842 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8843 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8844 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8845 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8846 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8847 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8848 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8849 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8850 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8851 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8852 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8853 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8854 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8855 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8856 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8857 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8858 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8859 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8860 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8861 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8862 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8863 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8864 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8865 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8866 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8867 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8868 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8869 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8870 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8871 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8872 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8873 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8876 Version 1.8.0 (2016-04-14)
8877 ==========================
8882 * Rust supports overloading of compound assignment statements like
8883 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8884 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8885 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8887 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8888 addition to the non-braced form, `struct Foo;`. [RFC 218].
8894 * [`str::encode_utf16`] (renamed from `utf16_units`)
8895 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8898 * [`ptr::drop_in_place`]
8900 * [`time::SystemTime`]
8902 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8903 * [`Instant::elapsed`]
8904 * [`SystemTime::now`]
8905 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8906 * [`SystemTime::elapsed`]
8907 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8908 * [`SystemTimeError`]
8909 * [`SystemTimeError::duration`]
8910 * Various impls for `SystemTimeError`
8912 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8913 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8914 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8915 * [The `write!` and `writeln!` macros correctly emit errors if any of
8916 their arguments can't be formatted][1.8w].
8917 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8918 * [The Unix-specific `raw` modules, which contain a number of
8919 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8920 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8921 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8922 across platforms was making it difficult to implement `std`
8923 correctly. Those that need these definitions should use the `libc`
8925 * The Unix-specific `MetadataExt` traits, including
8926 `os::unix::fs::MetadataExt`, which expose values such as inode
8927 numbers [no longer return platform-specific types][1.8r], but
8928 instead return widened integers. [RFC 1415].
8929 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8930 * [Atomic loads and stores are not volatile][1.8a].
8931 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8936 * [Inlining hash functions lead to a 3% compile-time improvement in
8937 some workloads][1.8h].
8938 * When using jemalloc, its symbols are [unprefixed so that it
8939 overrides the libc malloc implementation][1.8h]. This means that for
8940 rustc, LLVM is now using jemalloc, which results in a 6%
8941 compile-time improvement on a specific workload.
8942 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8947 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8948 i686-pc-windows-msvc is now considered a tier-1 platform.
8949 * [The `--print targets` flag prints a list of supported targets][1.8t].
8950 * [The `--print cfg` flag prints the `cfg`s defined for the current
8952 * [`rustc` can be built with an new Cargo-based build system, written
8953 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8954 build system. To enable it configure with `configure --rustbuild`.
8955 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8956 variants while also indicating the total number of missing variants
8957 if more than 3][1.8m].
8958 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8959 * The Rust Project now publishes binary releases of the standard
8960 library for a number of tier-2 targets:
8961 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8962 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8963 `x86_64-rumprun-netbsd`. These can be installed with
8964 tools such as [multirust][1.8mr].
8969 * [`cargo init` creates a new Cargo project in the current
8970 directory][1.8ci]. It is otherwise like `cargo new`.
8971 * [Cargo has configuration keys for `-v` and
8972 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8973 `[term]` section of `.cargo/config`.
8974 * [Configuration keys that evaluate to strings or integers can be set
8975 via environment variables][1.8ce]. For example the `build.jobs` key
8976 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8977 precedence over config files.
8978 * [Target-specific dependencies support Rust `cfg` syntax for
8979 describing targets][1.8cfg] so that dependencies for multiple
8980 targets can be specified together. [RFC 1361].
8981 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8982 `RUSTDOC` take precedence over the `build.target-dir`,
8983 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8984 * [The child process tree is killed on Windows when Cargo is
8986 * [The `build.target` configuration value sets the target platform,
8987 like `--target`][1.8ct].
8992 * [Unstable compiler flags have been further restricted][1.8u]. Since
8993 1.0 `-Z` flags have been considered unstable, and other flags that
8994 were considered unstable additionally required passing `-Z
8995 unstable-options` to access. Unlike unstable language and library
8996 features though, these options have been accessible on the stable
8997 release channel. Going forward, *new unstable flags will not be
8998 available on the stable release channel*, and old unstable flags
8999 will warn about their usage. In the future, all unstable flags will
9000 be unavailable on the stable release channel.
9001 * [It is no longer possible to `match` on empty enum variants using
9002 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
9003 * The Unix-specific `MetadataExt` traits, including
9004 `os::unix::fs::MetadataExt`, which expose values such as inode
9005 numbers [no longer return platform-specific types][1.8r], but
9006 instead return widened integers. [RFC 1415].
9007 * [Modules sourced from the filesystem cannot appear within arbitrary
9008 blocks, but only within other modules][1.8mf].
9009 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
9010 * On Unix, [stack overflow triggers a runtime abort instead of a
9012 * [`Command::spawn` and its equivalents return an error if any of
9013 its command-line arguments contain interior `NUL`s][1.8n].
9014 * [Tuple and unit enum variants from other crates are in the type
9016 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
9017 type instead of `.a` files][1.8st]. Additionally, for the MSVC
9018 toolchain, `rustc` emits import libraries named `foo.dll.lib`
9019 instead of `foo.lib`.
9022 [1.8a]: https://github.com/rust-lang/rust/pull/30962
9023 [1.8b]: https://github.com/rust-lang/rust/pull/31123
9024 [1.8c]: https://github.com/rust-lang/rust/pull/31530
9025 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
9026 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
9027 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
9028 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
9029 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
9030 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
9031 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
9032 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
9033 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
9034 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
9035 [1.8h]: https://github.com/rust-lang/rust/pull/31460
9036 [1.8l]: https://github.com/rust-lang/rust/pull/31668
9037 [1.8m]: https://github.com/rust-lang/rust/pull/31020
9038 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
9039 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
9040 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
9041 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
9042 [1.8n]: https://github.com/rust-lang/rust/pull/31056
9043 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
9044 [1.8r]: https://github.com/rust-lang/rust/pull/31551
9045 [1.8so]: https://github.com/rust-lang/rust/pull/31333
9046 [1.8st]: https://github.com/rust-lang/rust/pull/29520
9047 [1.8t]: https://github.com/rust-lang/rust/pull/31358
9048 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
9049 [1.8u]: https://github.com/rust-lang/rust/pull/31793
9050 [1.8v]: https://github.com/rust-lang/rust/pull/31757
9051 [1.8w]: https://github.com/rust-lang/rust/pull/31904
9052 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
9053 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
9054 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
9055 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
9056 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
9057 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
9058 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
9059 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
9060 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
9061 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
9062 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
9063 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
9064 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
9065 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
9066 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
9067 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
9068 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
9069 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
9070 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
9071 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
9072 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
9073 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
9074 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
9075 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
9076 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
9077 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
9078 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
9079 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
9080 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
9081 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
9084 Version 1.7.0 (2016-03-03)
9085 ==========================
9092 * [`Path::strip_prefix`] (renamed from relative_from)
9093 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
9095 * [`Ipv4Addr::is_loopback`]
9096 * [`Ipv4Addr::is_private`]
9097 * [`Ipv4Addr::is_link_local`]
9098 * [`Ipv4Addr::is_multicast`]
9099 * [`Ipv4Addr::is_broadcast`]
9100 * [`Ipv4Addr::is_documentation`]
9102 * [`Ipv6Addr::is_unspecified`]
9103 * [`Ipv6Addr::is_loopback`]
9104 * [`Ipv6Addr::is_multicast`]
9107 * [`Vec::as_mut_slice`]
9109 * [`String::as_str`]
9110 * [`String::as_mut_str`]
9112 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9114 * `<[T]>::`[`sort_by_key`]
9115 * checked, saturated, and overflowing operations
9116 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9117 * [`i32::saturating_mul`]
9118 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9119 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9120 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9121 * [`u32::saturating_mul`]
9122 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9123 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9124 * and checked, saturated, and overflowing operations for other primitive types
9126 * [`ffi::IntoStringError`]
9127 * [`CString::into_string`]
9128 * [`CString::into_bytes`]
9129 * [`CString::into_bytes_with_nul`]
9130 * `From<CString> for Vec<u8>`
9132 * [`IntoStringError::into_cstring`]
9133 * [`IntoStringError::utf8_error`]
9134 * `Error for IntoStringError`
9136 * [`std::hash::BuildHasher`]
9137 * [`BuildHasher::Hasher`]
9138 * [`BuildHasher::build_hasher`]
9139 * [`std::hash::BuildHasherDefault`]
9140 * [`HashMap::with_hasher`]
9141 * [`HashMap::with_capacity_and_hasher`]
9142 * [`HashSet::with_hasher`]
9143 * [`HashSet::with_capacity_and_hasher`]
9144 * [`std::collections::hash_map::RandomState`]
9145 * [`RandomState::new`]
9146 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9147 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9148 from bytes is faster.
9149 * [The performance of `LineWriter` (and thus `io::stdout`) was
9150 improved by using `memchr` to search for newlines][1.7m].
9151 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9152 `f64` variants were stabilized previously.
9153 * [`BTreeMap` was rewritten to use less memory and improve the performance
9154 of insertion and iteration, the latter by as much as 5x][1.7bm].
9155 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9156 covariant over their contained type][1.7bt].
9157 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9158 over their contained type][1.7ll].
9159 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9161 * [`Any` is implemented for unsized types][1.7a].
9162 * [`Hash` is implemented for `Duration`][1.7h].
9167 * [When running tests with `--test`, rustdoc will pass `--cfg`
9168 arguments to the compiler][1.7dt].
9169 * [The compiler is built with RPATH information by default][1.7rpa].
9170 This means that it will be possible to run `rustc` when installed in
9171 unusual configurations without configuring the dynamic linker search
9173 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9174 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9175 over `LD_LIBRARY_PATH`.
9180 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9181 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9182 * [The `rerun-if-changed` build script directive no longer causes the
9183 build script to incorrectly run twice in certain scenarios][1.7rr].
9188 * Soundness fixes to the interactions between associated types and
9189 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9190 code that violates the new rules. This is a significant change that
9191 is known to break existing code, so it has emitted warnings for the
9192 new error cases since 1.4 to give crate authors time to adapt. The
9193 details of what is changing are subtle; read the RFC for more.
9194 * [Several bugs in the compiler's visibility calculations were
9195 fixed][1.7v]. Since this was found to break significant amounts of
9196 code, the new errors will be emitted as warnings for several release
9197 cycles, under the `private_in_public` lint.
9198 * Defaulted type parameters were accidentally accepted in positions
9199 that were not intended. In this release, [defaulted type parameters
9200 appearing outside of type definitions will generate a
9201 warning][1.7d], which will become an error in future releases.
9202 * [Parsing "." as a float results in an error instead of 0][1.7p].
9203 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9204 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9206 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9207 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9208 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9209 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9210 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9211 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9212 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9213 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9214 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9215 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9216 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9217 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9218 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9219 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9220 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9221 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9222 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9223 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9224 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9225 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9226 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9227 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9228 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9229 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9230 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9231 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9232 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9233 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9234 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9235 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9236 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9237 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9238 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9239 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9240 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9241 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9242 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9243 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9244 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9245 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9246 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9247 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9248 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9249 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9250 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9251 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9252 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9253 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9254 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9255 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9256 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9257 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9258 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9259 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9260 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9261 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9262 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9263 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9264 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9265 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9266 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9267 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9268 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9269 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9270 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9271 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9272 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9273 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9274 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9275 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9276 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9277 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9278 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9279 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9280 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9281 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9282 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9283 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9284 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9287 Version 1.6.0 (2016-01-21)
9288 ==========================
9293 * The `#![no_std]` attribute causes a crate to not be linked to the
9294 standard library, but only the [core library][1.6co], as described
9295 in [RFC 1184]. The core library defines common types and traits but
9296 has no platform dependencies whatsoever, and is the basis for Rust
9297 software in environments that cannot support a full port of the
9298 standard library, such as operating systems. Most of the core
9299 library is now stable.
9305 [`Read::read_exact`],
9306 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9307 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9308 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9309 [`os::unix::fs::DirBuilderExt`],
9310 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9311 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9312 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9313 [`collections::hash_map::Drain`],
9314 [`collections::hash_map::HashMap::drain`],
9315 [`collections::hash_set::Drain`],
9316 [`collections::hash_set::HashSet::drain`],
9317 [`collections::binary_heap::Drain`],
9318 [`collections::binary_heap::BinaryHeap::drain`],
9319 [`Vec::extend_from_slice`] (renamed from `push_all`),
9320 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9321 [`RwLock::into_inner`],
9322 [`Iterator::min_by_key`] (renamed from `min_by`),
9323 [`Iterator::max_by_key`] (renamed from `max_by`).
9324 * The [core library][1.6co] is stable, as are most of its APIs.
9325 * [The `assert_eq!` macro supports arguments that don't implement
9326 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9328 * Several timer functions that take duration in milliseconds [are
9329 deprecated in favor of those that take `Duration`][1.6ms]. These
9330 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9331 `thread::park_timeout_ms`.
9332 * The algorithm by which `Vec` reserves additional elements was
9333 [tweaked to not allocate excessive space][1.6a] while still growing
9335 * `From` conversions are [implemented from integers to floats][1.6f]
9336 in cases where the conversion is lossless. Thus they are not
9337 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9338 or `f64`. They are also not implemented for `isize` and `usize`
9339 because the implementations would be platform-specific. `From` is
9340 also implemented from `f32` to `f64`.
9341 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9342 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9343 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9344 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9346 * Sorting slices that are already sorted [is 50% faster in some
9352 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9353 * Cargo build scripts can specify their dependencies by emitting the
9354 [`rerun-if-changed`][1.6rr] key.
9355 * crates.io will reject publication of crates with dependencies that
9356 have a wildcard version constraint. Crates with wildcard
9357 dependencies were seen to cause a variety of problems, as described
9358 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9360 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9361 release folder. A variety of artifacts that Cargo failed to clean
9362 are now correctly deleted.
9367 * The `unreachable_code` lint [warns when a function call's argument
9369 * The parser indicates [failures that may be caused by
9370 confusingly-similar Unicode characters][1.6uc]
9371 * Certain macro errors [are reported at definition time][1.6m], not
9377 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9378 environment variable when locating crates. This was a pre-cargo
9379 feature for integrating with the package manager that was
9380 accidentally never removed.
9381 * [A number of bugs were fixed in the privacy checker][1.6p] that
9382 could cause previously-accepted code to break.
9383 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9384 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9385 struct pattern syntax (`Foo(..)`) can no longer be used to match
9386 unit structs. This is a warning now, but will become an error in
9387 future releases. Patterns that share the same name as a const are
9389 * A bug was fixed that causes [rustc not to apply default type
9390 parameters][1.6xc] when resolving certain method implementations of
9391 traits defined in other crates.
9393 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9394 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9395 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9396 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9397 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9398 [1.6co]: http://doc.rust-lang.org/core/index.html
9399 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9400 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9401 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9402 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9403 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9404 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9405 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9406 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9407 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9408 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9409 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9410 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9411 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9412 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9413 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9414 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9415 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9416 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9417 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9418 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9419 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9420 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9421 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9422 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9423 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9424 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9425 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9426 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9427 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9428 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9429 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9430 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9431 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9432 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9433 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9434 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9435 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9436 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9437 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9438 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9439 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9442 Version 1.5.0 (2015-12-10)
9443 ==========================
9445 * ~700 changes, numerous bugfixes
9451 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9452 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9453 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9454 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9455 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9456 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9457 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9458 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9459 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9460 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9461 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9462 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9463 [`Path::read_link`], [`Path::symlink_metadata`],
9464 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9465 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9466 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9467 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9468 [`slice::split_first_mut`], [`slice::split_first`],
9469 [`slice::split_last_mut`], [`slice::split_last`],
9470 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9471 [`str::MatchIndices`], [`str::RMatchIndices`],
9472 [`str::match_indices`], [`str::rmatch_indices`],
9473 [`str::slice_mut_unchecked`], [`string::ParseError`].
9474 * Rust applications hosted on crates.io can be installed locally to
9475 `~/.cargo/bin` with the [`cargo install`] command. Among other
9476 things this makes it easier to augment Cargo with new subcommands:
9477 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9478 invoked as `cargo foo`.
9479 * Crates with wildcard (`*`) dependencies will [emit warnings when
9480 published][1.5w]. In 1.6 it will no longer be possible to publish
9481 crates with wildcard dependencies.
9486 * The rules determining when a particular lifetime must outlive
9487 a particular value (known as '[dropck]') have been [modified
9488 to not rely on parametricity][1.5p].
9489 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9490 and `Arc`][1.5a]. Because these smart pointer types implement
9491 `Deref`, this causes breakage in cases where the interior type
9492 contains methods of the same name.
9493 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9494 that they could drop their content. Soundness fix.
9495 * All method invocations are [properly checked][1.5wf1] for
9496 [well-formedness][1.5wf2]. Soundness fix.
9497 * Traits whose supertraits contain `Self` are [not object
9498 safe][1.5o]. Soundness fix.
9499 * Target specifications support a [`no_default_libraries`][1.5nd]
9500 setting that controls whether `-nodefaultlibs` is passed to the
9501 linker, and in turn the `is_like_windows` setting no longer affects
9502 the `-nodefaultlibs` flag.
9503 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9504 * The `#[inline]` and `#[repr]` attributes [can only appear
9505 in valid locations][1.5at].
9506 * Native libraries linked from the local crate are [passed to
9507 the linker before native libraries from upstream crates][1.5nl].
9508 * Two rarely-used attributes, `#[no_debug]` and
9509 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9510 * Negation of unsigned integers, which has been a warning for
9511 several releases, [is now behind a feature gate and will
9512 generate errors][1.5nu].
9513 * The parser accidentally accepted visibility modifiers on
9514 enum variants, a bug [which has been fixed][1.5ev].
9515 * [A bug was fixed that allowed `use` statements to import unstable
9521 * When evaluating expressions at compile-time that are not
9522 compile-time constants (const-evaluating expressions in non-const
9523 contexts), incorrect code such as overlong bitshifts and arithmetic
9524 overflow will [generate a warning instead of an error][1.5ce],
9525 delaying the error until runtime. This will allow the
9526 const-evaluator to be expanded in the future backwards-compatibly.
9527 * The `improper_ctypes` lint [no longer warns about using `isize` and
9528 `usize` in FFI][1.5ict].
9533 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9535 * `Default` is [implemented for mutable slices][1.5d].
9536 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9537 * There are now `From` conversions [between floating point
9538 types][1.5f] where the conversions are lossless.
9539 * There are now `From` conversions [between integer types][1.5i] where
9540 the conversions are lossless.
9541 * [`fs::Metadata` implements `Clone`][1.5fs].
9542 * The `parse` method [accepts a leading "+" when parsing
9544 * [`AsMut` is implemented for `Vec`][1.5am].
9545 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9546 been optimized][1.5cf] and no longer rely on the default impl.
9547 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9548 `unsafe extern "C"` function types now [implement `Clone`,
9549 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9550 `fmt::Debug` for up to 12 arguments][1.5fp].
9551 * [Dropping `Vec`s is much faster in unoptimized builds when the
9552 element types don't implement `Drop`][1.5dv].
9553 * A bug that caused in incorrect behavior when [combining `VecDeque`
9554 with zero-sized types][1.5vdz] was resolved.
9555 * [`PartialOrd` for slices is faster][1.5po].
9560 * [Crate metadata size was reduced by 20%][1.5md].
9561 * [Improvements to code generation reduced the size of libcore by 3.3
9562 MB and rustc's memory usage by 18MB][1.5m].
9563 * [Improvements to deref translation increased performance in
9564 unoptimized builds][1.5dr].
9565 * Various errors in trait resolution [are deduplicated to only be
9566 reported once][1.5te].
9567 * Rust has preliminary [support for rumprun kernels][1.5rr].
9568 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9570 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9571 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9572 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9573 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9574 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9575 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9576 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9577 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9578 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9579 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9580 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9581 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9582 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9583 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9584 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9585 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9586 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9587 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9588 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9589 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9590 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9591 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9592 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9593 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9594 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9595 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9596 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9597 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9598 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9599 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9600 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9601 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9602 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9603 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9604 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9605 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9606 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9607 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9608 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9609 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9610 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9611 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9612 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9613 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9614 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9615 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9616 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9617 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9618 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9619 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9620 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9621 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9622 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9623 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9624 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9625 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9626 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9627 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9628 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9629 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9630 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9631 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9632 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9633 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9634 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9635 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9636 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9637 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9638 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9639 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9640 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9641 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9642 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9643 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9644 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9645 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9646 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9647 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9648 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9649 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9650 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9651 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9652 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9653 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9654 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9655 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9656 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9657 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9658 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9660 Version 1.4.0 (2015-10-29)
9661 ==========================
9663 * ~1200 changes, numerous bugfixes
9668 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9669 GNU) are now supported and recommended for use.
9674 * [Several changes have been made to fix type soundness and improve
9675 the behavior of associated types][sound]. See [RFC 1214]. Although
9676 we have mostly introduced these changes as warnings this release, to
9677 become errors next release, there are still some scenarios that will
9678 see immediate breakage.
9679 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9680 line breaks in addition to `\n`][crlf].
9681 * [Loans of `'static` lifetime extend to the end of a function][stat].
9682 * [`str::parse` no longer introduces avoidable rounding error when
9683 parsing floating point numbers. Together with earlier changes to
9684 float formatting/output, "round trips" like f.to_string().parse()
9685 now preserve the value of f exactly. Additionally, leading plus
9686 signs are now accepted][fp3].
9692 * `use` statements that import multiple items [can now rename
9693 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9694 * [Binops work correctly on fat pointers][binfat].
9695 * `pub extern crate`, which does not behave as expected, [issues a
9696 warning][pec] until a better solution is found.
9701 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9702 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9703 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9704 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9705 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9706 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9707 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9708 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9709 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9710 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9711 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9712 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9713 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9714 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9715 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9716 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9717 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9718 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9720 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9721 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9722 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9723 `f64::from_str_radix`.
9724 * [Reverse-searching strings is faster with the 'two-way'
9726 * [`std::io::copy` allows `?Sized` arguments][cc].
9727 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9728 [override `count`, `nth` and `last` with an *O*(1)
9729 implementation][it].
9730 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9731 * [`IntoRawFd` has been added to the Unix-specific prelude,
9732 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9734 * [`Extend<String>` and `FromIterator<String` are both implemented for
9736 * [`IntoIterator` is implemented for references to `Option` and
9738 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9739 Copy`][ext] as part of [RFC 839]. This will cause type inference
9740 breakage in rare situations.
9741 * [`BinaryHeap` implements `Debug`][bh2].
9742 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9744 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9745 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9746 * [String comparison is faster][faststr].
9747 * `&mut T` where `T: std::fmt::Write` [also implements
9748 `std::fmt::Write`][mutw].
9749 * [A stable regression in `VecDeque::push_back` and other
9750 capacity-altering methods that caused panics for zero-sized types
9752 * [Function pointers implement traits for up to 12 parameters][fp2].
9757 * The compiler [no longer uses the 'morestack' feature to prevent
9758 stack overflow][mm]. Instead it uses guard pages and stack
9759 probes (though stack probes are not yet implemented on any platform
9761 * [The compiler matches traits faster when projections are involved][p].
9762 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9764 * [Cargo now displays useful information about what its doing during
9765 `cargo update`][cu].
9767 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9768 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9769 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9770 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9771 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9772 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9773 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9774 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9775 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9776 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9777 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9778 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9779 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9780 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9781 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9782 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9783 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9784 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9785 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9786 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9787 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9788 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9789 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9790 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9791 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9792 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9793 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9794 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9795 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9796 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9797 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9798 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9799 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9800 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9801 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9802 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9803 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9804 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9805 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9806 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9807 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9808 [bh2]: https://github.com/rust-lang/rust/pull/28156
9809 [binfat]: https://github.com/rust-lang/rust/pull/28270
9810 [bm]: https://github.com/rust-lang/rust/pull/28197
9811 [cc]: https://github.com/rust-lang/rust/pull/27531
9812 [crlf]: https://github.com/rust-lang/rust/pull/28034
9813 [cu]: https://github.com/rust-lang/cargo/pull/1931
9814 [d]: https://github.com/rust-lang/rust/pull/27825
9815 [dep]: https://github.com/rust-lang/rust/pull/28339
9816 [es]: https://github.com/rust-lang/rust/pull/27956
9817 [ext]: https://github.com/rust-lang/rust/pull/28094
9818 [faststr]: https://github.com/rust-lang/rust/pull/28338
9819 [ffi]: https://github.com/rust-lang/rust/pull/28779
9820 [fp]: https://github.com/rust-lang/rust/pull/28268
9821 [fp2]: https://github.com/rust-lang/rust/pull/28560
9822 [fp3]: https://github.com/rust-lang/rust/pull/27307
9823 [i]: https://github.com/rust-lang/rust/pull/27451
9824 [into2]: https://github.com/rust-lang/rust/pull/28039
9825 [it]: https://github.com/rust-lang/rust/pull/27652
9826 [mm]: https://github.com/rust-lang/rust/pull/27338
9827 [mutw]: https://github.com/rust-lang/rust/pull/28368
9828 [sound]: https://github.com/rust-lang/rust/pull/27641
9829 [p]: https://github.com/rust-lang/rust/pull/27866
9830 [pec]: https://github.com/rust-lang/rust/pull/28486
9831 [pr]: https://github.com/rust-lang/rust/pull/27896
9832 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9833 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9834 [s]: https://github.com/rust-lang/rust/pull/27474
9835 [stab]: https://github.com/rust-lang/rust/pull/28339
9836 [stat]: https://github.com/rust-lang/rust/pull/28321
9837 [vd]: https://github.com/rust-lang/rust/pull/28494
9839 Version 1.3.0 (2015-09-17)
9840 ==============================
9842 * ~900 changes, numerous bugfixes
9847 * The [new object lifetime defaults][nold] have been [turned
9848 on][nold2] after a cycle of warnings about the change. Now types
9849 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9850 being interpreted as `&'a Box<Trait+'a>` to `&'a
9851 Box<Trait+'static>`.
9852 * [The Rustonomicon][nom] is a new book in the official documentation
9853 that dives into writing unsafe Rust.
9854 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9855 timekeeping is employed by other std APIs, as well as out-of-tree
9861 * The [new object lifetime defaults][nold] have been [turned
9862 on][nold2] after a cycle of warnings about the change.
9863 * There is a known [regression][lr] in how object lifetime elision is
9864 interpreted, the proper solution for which is undetermined.
9865 * The `#[prelude_import]` attribute, an internal implementation
9866 detail, was accidentally stabilized previously. [It has been put
9867 behind the `prelude_import` feature gate][pi]. This change is
9868 believed to break no existing code.
9869 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9870 [more sane for dynamically sized types][dst3]. Code that relied on
9871 the previous behavior is thought to be broken.
9872 * The `dropck` rules, which checks that destructors can't access
9873 destroyed values, [have been updated][dropck] to match the
9874 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9875 cause some previously-compiling code to no longer build.
9880 * The [new object lifetime defaults][nold] have been [turned
9881 on][nold2] after a cycle of warnings about the change.
9882 * Semicolons may [now follow types and paths in
9883 macros](https://github.com/rust-lang/rust/pull/27000).
9884 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9885 [more sane for dynamically sized types][dst3]. Code that relied on
9886 the previous behavior is not known to exist, and suspected to be
9888 * `'static` variables [may now be recursive][st].
9889 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9890 implementations correctly.
9891 * The `dropck` rules, which checks that destructors can't access
9892 destroyed values, [have been updated][dropck] to match the
9898 * The [`Duration`] API, [has been stabilized][ds], as well as the
9899 `std::time` module, which presently contains only `Duration`.
9900 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9901 * The owned C string, [`CString`], implements [`Borrow`] and the
9902 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9903 these allow C strings to be borrowed and cloned in generic code.
9904 * [`CStr`] implements [`Debug`].
9905 * [`AtomicPtr`] implements [`Debug`].
9906 * [`Error`] trait objects [can be downcast to their concrete types][e]
9907 in many common configurations, using the [`is`], [`downcast`],
9908 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9910 * Searching for substrings now [employs the two-way algorithm][search]
9911 instead of doing a naive search. This gives major speedups to a
9912 number of methods, including [`contains`][sc], [`find`][sf],
9913 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9914 [`ends_with`][sew] are also faster.
9915 * The performance of `PartialEq` for slices is [much faster][ps].
9916 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9917 is overridden and optimized by the implementations for scalars.
9918 * The [`Hasher`] trait now has a number of specialized `write_*`
9919 methods for primitive types, for efficiency.
9920 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9921 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9922 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9923 of [`std::error::Error::cause`][iec] also delegates to the inner
9925 * [`process::Child`][pc] gained the [`id`] method, which returns a
9926 `u32` representing the platform-specific process identifier.
9927 * The [`connect`] method on slices is deprecated, replaced by the new
9928 [`join`] method (note that both of these are on the *unstable*
9929 [`SliceConcatExt`] trait, but through the magic of the prelude are
9930 available to stable code anyway).
9931 * The [`Div`] operator is implemented for [`Wrapping`] types.
9932 * [`DerefMut` is implemented for `String`][dms].
9933 * Performance of SipHash (the default hasher for `HashMap`) is
9934 [better for long data][sh].
9935 * [`AtomicPtr`] implements [`Send`].
9936 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9937 are now [specialized to use uninitialized buffers for increased
9939 * Lifetime parameters of foreign functions [are now resolved
9945 * Rust can now, with some coercion, [produce programs that run on
9946 Windows XP][xp], though XP is not considered a supported platform.
9947 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9948 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9949 recommended for use in 1.3, though should be fully-functional
9950 in the [64-bit 1.4 beta][b14].
9951 * On Fedora-based systems installation will [properly configure the
9952 dynamic linker][fl].
9953 * The compiler gained many new extended error descriptions, which can
9954 be accessed with the `--explain` flag.
9955 * The `dropck` pass, which checks that destructors can't access
9956 destroyed values, [has been rewritten][27261]. This fixes some
9957 soundness holes, and as such will cause some previously-compiling
9958 code to no longer build.
9959 * `rustc` now uses [LLVM to write archive files where possible][ar].
9960 Eventually this will eliminate the compiler's dependency on the ar
9962 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9963 supported FreeBSD on x86_64).
9964 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9965 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9967 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9968 will kill the process instead of leaking][nlp].
9970 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9971 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9972 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9973 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9974 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9975 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9976 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9977 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9978 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9979 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9980 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9981 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9982 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9983 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9984 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9985 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9986 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9987 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9988 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9989 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9990 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9991 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9992 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9993 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9994 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9995 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9996 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9997 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9998 [ar]: https://github.com/rust-lang/rust/pull/26926
9999 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
10000 [dms]: https://github.com/rust-lang/rust/pull/26241
10001 [27261]: https://github.com/rust-lang/rust/pull/27261
10002 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10003 [ds]: https://github.com/rust-lang/rust/pull/26818
10004 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
10005 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
10006 [dst3]: https://github.com/rust-lang/rust/pull/27351
10007 [e]: https://github.com/rust-lang/rust/pull/24793
10008 [f]: https://github.com/rust-lang/rust/pull/26588
10009 [26959]: https://github.com/rust-lang/rust/pull/26959
10010 [fl]: https://github.com/rust-lang/rust-installer/pull/41
10011 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
10012 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
10013 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
10014 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
10015 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
10016 [lic]: https://github.com/rust-lang/rust/pull/26583
10017 [lnu]: https://github.com/rust-lang/rust/pull/27026
10018 [lr]: https://github.com/rust-lang/rust/issues/27248
10019 [lum]: https://github.com/rust-lang/rust/pull/26378
10020 [lur]: https://github.com/rust-lang/rust/pull/26783
10021 [nlp]: https://github.com/rust-lang/rust/pull/27176
10022 [nold2]: https://github.com/rust-lang/rust/pull/27045
10023 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
10024 [nom]: http://doc.rust-lang.org/nightly/nomicon/
10025 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
10026 [pi]: https://github.com/rust-lang/rust/pull/26699
10027 [ps]: https://github.com/rust-lang/rust/pull/26884
10028 [rte]: https://github.com/rust-lang/rust/pull/26950
10029 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
10030 [search]: https://github.com/rust-lang/rust/pull/26327
10031 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
10032 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
10033 [sh]: https://github.com/rust-lang/rust/pull/27280
10034 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
10035 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
10036 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
10037 [st]: https://github.com/rust-lang/rust/pull/26630
10038 [win1]: https://github.com/rust-lang/rust/pull/26569
10039 [win2]: https://github.com/rust-lang/rust/pull/26741
10040 [win3]: https://github.com/rust-lang/rust/pull/26741
10041 [win4]: https://github.com/rust-lang/rust/pull/27210
10042 [xp]: https://github.com/rust-lang/rust/pull/26569
10044 Version 1.2.0 (2015-08-07)
10045 ==========================
10047 * ~1200 changes, numerous bugfixes
10052 * [Dynamically-sized-type coercions][dst] allow smart pointer types
10053 like `Rc` to contain types without a fixed size, arrays and trait
10054 objects, finally enabling use of `Rc<[T]>` and completing the
10055 implementation of DST.
10056 * [Parallel codegen][parcodegen] is now working again, which can
10057 substantially speed up large builds in debug mode; It also gets
10058 another ~33% speedup when bootstrapping on a 4 core machine (using 8
10059 jobs). It's not enabled by default, but will be "in the near
10060 future". It can be activated with the `-C codegen-units=N` flag to
10062 * This is the first release with [experimental support for linking
10063 with the MSVC linker and lib C on Windows (instead of using the GNU
10064 variants via MinGW)][win]. It is yet recommended only for the most
10065 intrepid Rustaceans.
10066 * Benchmark compilations are showing a 30% improvement in
10067 bootstrapping over 1.1.
10072 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
10073 unicode case mapping, which is a previously-planned change in
10074 behavior and considered a bugfix.
10075 * [`mem::align_of`] now specifies [the *minimum alignment* for
10076 T][align], which is usually the alignment programs are interested
10077 in, and the same value reported by clang's
10078 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
10080 * [The `#[packed]` attribute is no longer silently accepted by the
10081 compiler][packed]. This attribute did nothing and code that
10082 mentioned it likely did not work as intended.
10083 * Associated type defaults are [now behind the
10084 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
10085 defaults *did not work*, but could be mentioned syntactically. As
10086 such this breakage has minimal impact.
10091 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
10092 matching against dereferenceable values.
10097 * The [`Extend`] trait, which grows a collection from an iterator, is
10098 implemented over iterators of references, for `String`, `Vec`,
10099 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
10100 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
10101 * The [`iter::once`] function returns an iterator that yields a single
10102 element, and [`iter::empty`] returns an iterator that yields no
10104 * The [`matches`] and [`rmatches`] methods on `str` return iterators
10105 over substring matches.
10106 * [`Cell`] and [`RefCell`] both implement `Eq`.
10107 * A number of methods for wrapping arithmetic are added to the
10108 integral types, [`wrapping_div`], [`wrapping_rem`],
10109 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10110 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10111 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10112 type.. It is illegal for the default arithmetic operations in Rust
10113 to overflow; the desire to wrap must be explicit.
10114 * The `{:#?}` formatting specifier [displays the alternate,
10115 pretty-printed][debugfmt] form of the `Debug` formatter. This
10116 feature was actually introduced prior to 1.0 with little
10118 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10119 for writing data to formatted strings, similar to [`io::Write`].
10120 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10121 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10122 are used by code generators to emit implementations of [`Debug`].
10123 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10124 methods that convert case, following Unicode case mapping.
10125 * It is now easier to handle poisoned locks. The [`PoisonError`]
10126 type, returned by failing lock operations, exposes `into_inner`,
10127 `get_ref`, and `get_mut`, which all give access to the inner lock
10128 guard, and allow the poisoned lock to continue to operate. The
10129 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10130 poisoned lock without attempting to take the lock.
10131 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10132 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10133 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10134 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10136 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10142 * `rustc` employs smarter heuristics for guessing at [typos].
10143 * `rustc` emits more efficient code for [no-op conversions between
10144 unsafe pointers][nop].
10145 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10146 resulting in faster compile times and smaller code.
10148 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10149 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10150 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10151 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10152 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10153 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10154 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10155 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10156 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10157 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10158 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10159 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10160 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10161 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10162 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10163 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10164 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10165 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10166 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10167 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10168 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10169 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10170 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10171 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10172 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10173 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10174 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10175 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10176 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10177 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10178 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10179 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10180 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10181 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10182 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10183 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10184 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10185 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10186 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10187 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10188 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10189 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10190 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10191 [align]: https://github.com/rust-lang/rust/pull/25646
10192 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10193 [typos]: https://github.com/rust-lang/rust/pull/26087
10194 [nop]: https://github.com/rust-lang/rust/pull/26336
10195 [fat]: https://github.com/rust-lang/rust/pull/26411
10196 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10197 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10198 [packed]: https://github.com/rust-lang/rust/pull/25541
10199 [ad]: https://github.com/rust-lang/rust/pull/27382
10200 [win]: https://github.com/rust-lang/rust/pull/25350
10202 Version 1.1.0 (2015-06-25)
10203 =========================
10205 * ~850 changes, numerous bugfixes
10210 * The [`std::fs` module has been expanded][fs] to expand the set of
10211 functionality exposed:
10212 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10213 don't incur a syscall on some platforms.
10214 * A `symlink_metadata` function has been added.
10215 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10216 access to all underlying information.
10217 * The compiler now contains extended explanations of many errors. When an error
10218 with an explanation occurs the compiler suggests using the `--explain` flag
10219 to read the explanation. Error explanations are also [available online][err-index].
10220 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10221 well as other work, the time to bootstrap the compiler decreased by
10227 * The [`str::split_whitespace`] method splits a string on unicode
10228 whitespace boundaries.
10229 * On both Windows and Unix, new extension traits provide conversion of
10230 I/O types to and from the underlying system handles. On Unix, these
10231 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10232 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10233 `TcpListener`, and `UpdSocket`. Further implementations for
10234 `std::process` will be stabilized later.
10235 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10236 Windows, symlinks can be created with
10237 `std::os::windows::symlink_dir` and
10238 `std::os::windows::symlink_file`.
10239 * The `mpsc::Receiver` type can now be converted into an iterator with
10240 `into_iter` on the [`IntoIterator`] trait.
10241 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10242 implementation of the [`From`] trait.
10243 * The `Debug` implementation for `RangeFull` [creates output that is
10244 more consistent with other implementations][rf].
10245 * [`Debug` is implemented for `File`][file].
10246 * The `Default` implementation for `Arc` [no longer requires `Sync +
10248 * [The `Iterator` methods `count`, `nth`, and `last` have been
10249 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10250 * Incorrect handling of paths on Windows has been improved in both the
10251 compiler and the standard library.
10252 * [`AtomicPtr` gained a `Default` implementation][ap].
10253 * In accordance with Rust's policy on arithmetic overflow `abs` now
10254 [panics on overflow when debug assertions are enabled][abs].
10255 * The [`Cloned`] iterator, which was accidentally left unstable for
10256 1.0 [has been stabilized][c].
10257 * The [`Incoming`] iterator, which iterates over incoming TCP
10258 connections, and which was accidentally unnamable in 1.0, [is now
10259 properly exported][inc].
10260 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10261 `sift_up` or `sift_down` panic][bh].
10262 * The [`split_off`] method of `LinkedList` [no longer corrupts
10263 the list in certain scenarios][ll].
10268 * Type checking performance [has improved notably][sk] with
10269 [multiple improvements][pre].
10270 * The compiler [suggests code changes][ch] for more errors.
10271 * rustc and it's build system have experimental support for [building
10272 toolchains against MUSL][m] instead of glibc on Linux.
10273 * The compiler defines the `target_env` cfg value, which is used for
10274 distinguishing toolchains that are otherwise for the same
10275 platform. Presently this is set to `gnu` for common GNU Linux
10276 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10277 * The [`cargo rustc`][crc] command invokes a build with custom flags
10279 * [Android executables are always position independent][pie].
10280 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10281 with `Drop`][24935].
10283 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10284 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10285 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10286 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10287 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10288 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10289 [rf]: https://github.com/rust-lang/rust/pull/24491
10290 [err-index]: https://doc.rust-lang.org/error-index.html
10291 [sk]: https://github.com/rust-lang/rust/pull/24615
10292 [pre]: https://github.com/rust-lang/rust/pull/25323
10293 [file]: https://github.com/rust-lang/rust/pull/24598
10294 [ch]: https://github.com/rust-lang/rust/pull/24683
10295 [arc]: https://github.com/rust-lang/rust/pull/24695
10296 [si]: https://github.com/rust-lang/rust/pull/24701
10297 [ap]: https://github.com/rust-lang/rust/pull/24834
10298 [m]: https://github.com/rust-lang/rust/pull/24777
10299 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10300 [crc]: https://github.com/rust-lang/cargo/pull/1568
10301 [pie]: https://github.com/rust-lang/rust/pull/24953
10302 [abs]: https://github.com/rust-lang/rust/pull/25441
10303 [c]: https://github.com/rust-lang/rust/pull/25496
10304 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10305 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10306 [inc]: https://github.com/rust-lang/rust/pull/25522
10307 [bh]: https://github.com/rust-lang/rust/pull/25856
10308 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10309 [ll]: https://github.com/rust-lang/rust/pull/26022
10310 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10311 [24935]: https://github.com/rust-lang/rust/pull/24935
10313 Version 1.0.0 (2015-05-15)
10314 ========================
10316 * ~1500 changes, numerous bugfixes
10321 * The vast majority of the standard library is now `#[stable]`. It is
10322 no longer possible to use unstable features with a stable build of
10324 * Many popular crates on [crates.io] now work on the stable release
10326 * Arithmetic on basic integer types now [checks for overflow in debug
10332 * Several [restrictions have been added to trait coherence][coh] in
10333 order to make it easier for upstream authors to change traits
10334 without breaking downstream code.
10335 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10336 improve error messages and macro behavior. For example, `0b1234` is
10337 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10338 * Trait bounds [are always invariant][inv], eliminating the need for
10339 the `PhantomFn` and `MarkerTrait` lang items, which have been
10341 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10342 "foo" as bar` syntax has been replaced with `extern crate foo as
10343 bar`, and Cargo now automatically translates "-" in *package* names
10344 to underscore for the crate name.
10345 * [Lifetime shadowing is an error][lt].
10346 * [`Send` no longer implies `'static`][send-rfc].
10347 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10348 `MyType::default()`.
10349 * Primitive types [now have inherent methods][prim-inherent],
10350 obviating the need for extension traits like `SliceExt`.
10351 * Methods with `Self: Sized` in their `where` clause are [considered
10352 object-safe][self-sized], allowing many extension traits like
10353 `IteratorExt` to be merged into the traits they extended.
10354 * You can now [refer to associated types][assoc-where] whose
10355 corresponding trait bounds appear only in a `where` clause.
10356 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10357 like `Send` and `Sync` are now library-defined.
10358 * A [Reflect trait][reflect] was introduced, which means that
10359 downcasting via the `Any` trait is effectively limited to concrete
10360 types. This helps retain the potentially-important "parametricity"
10361 property: generic code cannot behave differently for different type
10362 arguments except in minor ways.
10363 * The `unsafe_destructor` feature is now deprecated in favor of the
10364 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10370 * The `thread_local` module [has been renamed to `std::thread`][th].
10371 * The methods of `IteratorExt` [have been moved to the `Iterator`
10372 trait itself][23300].
10373 * Several traits that implement Rust's conventions for type
10374 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10375 [centralized in the `std::convert` module][con].
10376 * The `FromError` trait [was removed in favor of `From`][fe].
10377 * The basic sleep function [has moved to
10378 `std::thread::sleep_ms`][slp].
10379 * The `splitn` function now takes an `n` parameter that represents the
10380 number of items yielded by the returned iterator [instead of the
10381 number of 'splits'][spl].
10382 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10383 * [Derived implementations of `PartialOrd` now order enums according
10384 to their explicitly-assigned discriminants][po].
10385 * [Methods for searching strings are generic over `Pattern`s][pat],
10386 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10388 * [In method resolution, object methods are resolved before inherent
10390 * [`String::from_str` has been deprecated in favor of the `From` impl,
10391 `String::from`][24517].
10392 * [`io::Error` implements `Sync`][ios].
10393 * [The `words` method on `&str` has been replaced with
10394 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10396 * The new path and IO modules are complete and `#[stable]`. This
10397 was the major library focus for this cycle.
10398 * The path API was [revised][path-normalize] to normalize `.`,
10399 adjusting the tradeoffs in favor of the most common usage.
10400 * A large number of remaining APIs in `std` were also stabilized
10401 during this cycle; about 75% of the non-deprecated API surface
10403 * The new [string pattern API][string-pattern] landed, which makes
10404 the string slice API much more internally consistent and flexible.
10405 * A new set of [generic conversion traits][conversion] replaced
10406 many existing ad hoc traits.
10407 * Generic numeric traits were [completely removed][num-traits]. This
10408 was made possible thanks to inherent methods for primitive types,
10409 and the removal gives maximal flexibility for designing a numeric
10410 hierarchy in the future.
10411 * The `Fn` traits are now related via [inheritance][fn-inherit]
10412 and provide ergonomic [blanket implementations][fn-blanket].
10413 * The `Index` and `IndexMut` traits were changed to
10414 [take the index by value][index-value], enabling code like
10415 `hash_map["string"]` to work.
10416 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10417 `Copy` data is known to be `Clone` as well.
10422 * Many errors now have extended explanations that can be accessed with
10423 the `--explain` flag to `rustc`.
10424 * Many new examples have been added to the standard library
10426 * rustdoc has received a number of improvements focused on completion
10428 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10429 * Much headway was made on ecosystem-wide CI, making it possible
10430 to [compare builds for breakage][ci-compare].
10433 [crates.io]: http://crates.io
10434 [clo]: https://github.com/rust-lang/rust/pull/24034
10435 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10436 [con]: https://github.com/rust-lang/rust/pull/23875
10437 [cr]: https://github.com/rust-lang/rust/pull/23419
10438 [fe]: https://github.com/rust-lang/rust/pull/23879
10439 [23300]: https://github.com/rust-lang/rust/pull/23300
10440 [inv]: https://github.com/rust-lang/rust/pull/23938
10441 [ios]: https://github.com/rust-lang/rust/pull/24133
10442 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10443 [lt]: https://github.com/rust-lang/rust/pull/24057
10444 [meth]: https://github.com/rust-lang/rust/pull/24056
10445 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10446 [po]: https://github.com/rust-lang/rust/pull/24270
10447 [24517]: https://github.com/rust-lang/rust/pull/24517
10448 [slp]: https://github.com/rust-lang/rust/pull/23949
10449 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10450 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10451 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10452 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10453 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10454 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10455 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10456 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10457 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10458 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10459 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10460 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10461 [reflect]: https://github.com/rust-lang/rust/pull/23712
10462 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10463 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10464 [index-value]: https://github.com/rust-lang/rust/pull/23601
10465 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10466 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10467 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10468 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10469 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10470 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10473 Version 1.0.0-alpha.2 (2015-02-20)
10474 =====================================
10476 * ~1300 changes, numerous bugfixes
10480 * The various I/O modules were [overhauled][io-rfc] to reduce
10481 unnecessary abstractions and provide better interoperation with
10482 the underlying platform. The old `io` module remains temporarily
10484 * The standard library now [participates in feature gating][feat],
10485 so use of unstable libraries now requires a `#![feature(...)]`
10486 attribute. The impact of this change is [described on the
10487 forum][feat-forum]. [RFC][feat-rfc].
10491 * `for` loops [now operate on the `IntoIterator` trait][into],
10492 which eliminates the need to call `.iter()`, etc. to iterate
10493 over collections. There are some new subtleties to remember
10494 though regarding what sort of iterators various types yield, in
10495 particular that `for foo in bar { }` yields values from a move
10496 iterator, destroying the original collection. [RFC][into-rfc].
10497 * Objects now have [default lifetime bounds][obj], so you don't
10498 have to write `Box<Trait+'static>` when you don't care about
10499 storing references. [RFC][obj-rfc].
10500 * In types that implement `Drop`, [lifetimes must outlive the
10501 value][drop]. This will soon make it possible to safely
10502 implement `Drop` for types where `#[unsafe_destructor]` is now
10503 required. Read the [gorgeous RFC][drop-rfc] for details.
10504 * The fully qualified <T as Trait>::X syntax lets you set the Self
10505 type for a trait method or associated type. [RFC][ufcs-rfc].
10506 * References to types that implement `Deref<U>` now [automatically
10507 coerce to references][deref] to the dereferenced type `U`,
10508 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10509 should eliminate many unsightly uses of `&*`, as when converting
10510 from references to vectors into references to
10511 slices. [RFC][deref-rfc].
10512 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10513 `|:|`) is obsolete and closure kind is inferred from context.
10514 * [`Self` is a keyword][Self].
10518 * The `Show` and `String` formatting traits [have been
10519 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10520 their related purposes. Automatically getting a string
10521 conversion to use with `format!("{:?}", something_to_debug)` is
10522 now written `#[derive(Debug)]`.
10523 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10524 OsStr}`, provide strings in platform-specific encodings for easier
10525 interop with system APIs. [RFC][osstr-rfc].
10526 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10527 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10528 creating raw pointers.
10532 * Certain long error messages of the form 'expected foo found bar'
10533 are now [split neatly across multiple
10534 lines][multiline]. Examples in the PR.
10535 * On Unix Rust can be [uninstalled][un] by running
10536 `/usr/local/lib/rustlib/uninstall.sh`.
10537 * The `#[rustc_on_unimplemented]` attribute, requiring the
10538 'on_unimplemented' feature, lets rustc [display custom error
10539 messages when a trait is expected to be implemented for a type
10544 * Rust is tested against a [LALR grammar][lalr], which parses
10545 almost all the Rust files that rustc does.
10547 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10548 [close]: https://github.com/rust-lang/rust/pull/21843
10549 [deref]: https://github.com/rust-lang/rust/pull/21351
10550 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10551 [drop]: https://github.com/rust-lang/rust/pull/21972
10552 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10553 [feat]: https://github.com/rust-lang/rust/pull/21248
10554 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10555 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10556 [fmt]: https://github.com/rust-lang/rust/pull/21457
10557 [into]: https://github.com/rust-lang/rust/pull/20790
10558 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10559 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10560 [lalr]: https://github.com/rust-lang/rust/pull/21452
10561 [multiline]: https://github.com/rust-lang/rust/pull/19870
10562 [obj]: https://github.com/rust-lang/rust/pull/22230
10563 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10564 [onun]: https://github.com/rust-lang/rust/pull/20889
10565 [osstr]: https://github.com/rust-lang/rust/pull/21488
10566 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10567 [Self]: https://github.com/rust-lang/rust/pull/22158
10568 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10569 [un]: https://github.com/rust-lang/rust/pull/22256
10572 Version 1.0.0-alpha (2015-01-09)
10573 ==================================
10575 * ~2400 changes, numerous bugfixes
10579 * The language itself is considered feature complete for 1.0,
10580 though there will be many usability improvements and bugfixes
10581 before the final release.
10582 * Nearly 50% of the public API surface of the standard library has
10583 been declared 'stable'. Those interfaces are unlikely to change
10585 * The long-running debate over integer types has been
10586 [settled][ints]: Rust will ship with types named `isize` and
10587 `usize`, rather than `int` and `uint`, for pointer-sized
10588 integers. Guidelines will be rolled out during the alpha cycle.
10589 * Most crates that are not `std` have been moved out of the Rust
10590 distribution into the Cargo ecosystem so they can evolve
10591 separately and don't need to be stabilized as quickly, including
10592 'time', 'getopts', 'num', 'regex', and 'term'.
10593 * Documentation continues to be expanded with more API coverage, more
10594 examples, and more in-depth explanations. The guides have been
10595 consolidated into [The Rust Programming Language][trpl].
10596 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10597 * All official Rust binary installers now come with [Cargo], the
10598 Rust package manager.
10602 * Closures have been [completely redesigned][unboxed] to be
10603 implemented in terms of traits, can now be used as generic type
10604 bounds and thus monomorphized and inlined, or via an opaque
10605 pointer (boxed) as in the old system. The new system is often
10606 referred to as 'unboxed' closures.
10607 * Traits now support [associated types][assoc], allowing families
10608 of related types to be defined together and used generically in
10610 * Enum variants are [namespaced by their type names][enum].
10611 * [`where` clauses][where] provide a more versatile and attractive
10612 syntax for specifying generic bounds, though the previous syntax
10614 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10616 * Rust [no longer has a runtime][rt] of any description, and only
10617 supports OS threads, not green threads.
10618 * At long last, Rust has been overhauled for 'dynamically-sized
10619 types' ([DST]), which integrates 'fat pointers' (object types,
10620 arrays, and `str`) more deeply into the type system, making it
10622 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10623 `..j` that produce range types and which, when combined with the
10624 `Index` operator and multidispatch, leads to a convenient slice
10625 notation, `[i..j]`.
10626 * The new range syntax revealed an ambiguity in the fixed-length
10627 array syntax, so now fixed length arrays [are written `[T;
10629 * The `Copy` trait is no longer implemented automatically. Unsafe
10630 pointers no longer implement `Sync` and `Send` so types
10631 containing them don't automatically either. `Sync` and `Send`
10632 are now 'unsafe traits' so one can "forcibly" implement them via
10633 `unsafe impl` if a type confirms to the requirements for them
10634 even though the internals do not (e.g. structs containing unsafe
10635 pointers like `Arc`). These changes are intended to prevent some
10636 footguns and are collectively known as [opt-in built-in
10637 traits][oibit] (though `Sync` and `Send` will soon become pure
10638 library types unknown to the compiler).
10639 * Operator traits now take their operands [by value][ops], and
10640 comparison traits can use multidispatch to compare one type
10641 against multiple other types, allowing e.g. `String` to be
10642 compared with `&str`.
10643 * `if let` and `while let` are no longer feature-gated.
10644 * Rust has adopted a more [uniform syntax for escaping unicode
10645 characters][unicode].
10646 * `macro_rules!` [has been declared stable][mac]. Though it is a
10647 flawed system it is sufficiently popular that it must be usable
10648 for 1.0. Effort has gone into [future-proofing][mac-future] it
10649 in ways that will allow other macro systems to be developed in
10650 parallel, and won't otherwise impact the evolution of the
10652 * The prelude has been [pared back significantly][prelude] such
10653 that it is the minimum necessary to support the most pervasive
10654 code patterns, and through [generalized where clauses][where]
10655 many of the prelude extension traits have been consolidated.
10656 * Rust's rudimentary reflection [has been removed][refl], as it
10657 incurred too much code generation for little benefit.
10658 * [Struct variants][structvars] are no longer feature-gated.
10659 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10660 known as 'higher-ranked trait bounds', this crucially allows
10661 unboxed closures to work.
10662 * Macros invocations surrounded by parens or square brackets and
10663 not terminated by a semicolon are [parsed as
10664 expressions][macros], which makes expressions like `vec![1i32,
10665 2, 3].len()` work as expected.
10666 * Trait objects now implement their traits automatically, and
10667 traits that can be coerced to objects now must be [object
10669 * Automatically deriving traits is now done with `#[derive(...)]`
10670 not `#[deriving(...)]` for [consistency with other naming
10671 conventions][derive].
10672 * Importing the containing module or enum at the same time as
10673 items or variants they contain is [now done with `self` instead
10674 of `mod`][self], as in use `foo::{self, bar}`
10675 * Glob imports are no longer feature-gated.
10676 * The `box` operator and `box` patterns have been feature-gated
10677 pending a redesign. For now unique boxes should be allocated
10678 like other containers, with `Box::new`.
10682 * A [series][coll1] of [efforts][coll2] to establish
10683 [conventions][coll3] for collections types has resulted in API
10684 improvements throughout the standard library.
10685 * New [APIs for error handling][err] provide ergonomic interop
10686 between error types, and [new conventions][err-conv] describe
10687 more clearly the recommended error handling strategies in Rust.
10688 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10689 it is easier to discuss failure in the context of error handling
10690 without making clarifications as to whether you are referring to
10691 the 'fail' macro or failure more generally.
10692 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10693 syscall when available.
10694 * The 'serialize' crate has been renamed 'rustc-serialize' and
10695 moved out of the distribution to Cargo. Although it is widely
10696 used now, it is expected to be superseded in the near future.
10697 * The `Show` formatter, typically implemented with
10698 `#[derive(Show)]` is [now requested with the `{:?}`
10699 specifier][show] and is intended for use by all types, for uses
10700 such as `println!` debugging. The new `String` formatter must be
10701 implemented by hand, uses the `{}` specifier, and is intended
10702 for full-fidelity conversions of things that can logically be
10703 represented as strings.
10707 * [Flexible target specification][flex] allows rustc's code
10708 generation to be configured to support otherwise-unsupported
10710 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10711 respective debuggers with Rust-appropriate pretty-printing.
10712 * The Windows installation of Rust is distributed with the
10713 MinGW components currently required to link binaries on that
10718 * Nullable enum optimizations have been extended to more types so
10719 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10720 space than the inner types themselves.
10721 * Work has begun on supporting AArch64.
10723 [Cargo]: https://crates.io
10724 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10725 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10726 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10727 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10728 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10729 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10730 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10731 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10732 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10733 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10734 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10735 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10736 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10737 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10738 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10739 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10740 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10741 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10742 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10743 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10744 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10745 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10746 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10747 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10748 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10749 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10750 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10751 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10752 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10753 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10754 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10755 [trpl]: https://doc.rust-lang.org/book/index.html
10756 [rbe]: http://rustbyexample.com/
10759 Version 0.12.0 (2014-10-09)
10760 =============================
10762 * ~1900 changes, numerous bugfixes
10766 * The introductory documentation (now called The Rust Guide) has
10767 been completely rewritten, as have a number of supplementary
10769 * Rust's package manager, Cargo, continues to improve and is
10770 sometimes considered to be quite awesome.
10771 * Many API's in `std` have been reviewed and updated for
10772 consistency with the in-development Rust coding
10773 guidelines. The standard library documentation tracks
10774 stabilization progress.
10775 * Minor libraries have been moved out-of-tree to the rust-lang org
10776 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10777 be installed with Cargo.
10778 * Lifetime elision allows lifetime annotations to be left off of
10779 function declarations in many common scenarios.
10780 * Rust now works on 64-bit Windows.
10783 * Indexing can be overloaded with the `Index` and `IndexMut`
10785 * The `if let` construct takes a branch only if the `let` pattern
10786 matches, currently behind the 'if_let' feature gate.
10787 * 'where clauses', a more flexible syntax for specifying trait
10788 bounds that is more aesthetic, have been added for traits and
10789 free functions. Where clauses will in the future make it
10790 possible to constrain associated types, which would be
10791 impossible with the existing syntax.
10792 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10793 the 'slicing_syntax' feature gate, and can be overloaded with
10794 the `Slice` or `SliceMut` traits.
10795 * The syntax for matching of sub-slices has been changed to use a
10796 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10797 consistency with other uses of `..` and to future-proof
10798 potential additional uses of the syntax.
10799 * The syntax for matching inclusive ranges in patterns has changed
10800 from `0..3` to `0...4` to be consistent with the exclusive range
10801 syntax for slicing.
10802 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10803 c]`) has been put behind the 'advanced_slice_patterns' feature
10804 gate and may be removed in the future.
10805 * Components of tuples and tuple structs can be extracted using
10806 the `value.0` syntax, currently behind the `tuple_indexing`
10808 * The `#[crate_id]` attribute is no longer supported; versioning
10809 is handled by the package manager.
10810 * Renaming crate imports are now written `extern crate foo as bar`
10811 instead of `extern crate bar = foo`.
10812 * Renaming use statements are now written `use foo as bar` instead
10813 of `use bar = foo`.
10814 * `let` and `match` bindings and argument names in macros are now
10816 * The new, more efficient, closure types ('unboxed closures') have
10817 been added under a feature gate, 'unboxed_closures'. These will
10818 soon replace the existing closure types, once higher-ranked
10819 trait lifetimes are added to the language.
10820 * `move` has been added as a keyword, for indicating closures
10821 that capture by value.
10822 * Mutation and assignment is no longer allowed in pattern guards.
10823 * Generic structs and enums can now have trait bounds.
10824 * The `Share` trait is now called `Sync` to free up the term
10825 'shared' to refer to 'shared reference' (the default reference
10827 * Dynamically-sized types have been mostly implemented,
10828 unifying the behavior of fat-pointer types with the rest of the
10830 * As part of dynamically-sized types, the `Sized` trait has been
10831 introduced, which qualifying types implement by default, and
10832 which type parameters expect by default. To specify that a type
10833 parameter does not need to be sized, write `<Sized? T>`. Most
10834 types are `Sized`, notable exceptions being unsized arrays
10835 (`[T]`) and trait types.
10836 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10837 * Lifetime bounds can now be applied to type parameters and object
10839 * The old, reference counted GC type, `Gc<T>` which was once
10840 denoted by the `@` sigil, has finally been removed. GC will be
10841 revisited in the future.
10844 * Library documentation has been improved for a number of modules.
10845 * Bit-vectors, collections::bitv has been modernized.
10846 * The url crate is deprecated in favor of
10847 http://github.com/servo/rust-url, which can be installed with
10849 * Most I/O stream types can be cloned and subsequently closed from
10850 a different thread.
10851 * A `std::time::Duration` type has been added for use in I/O
10852 methods that rely on timers, as well as in the 'time' crate's
10853 `Timespec` arithmetic.
10854 * The runtime I/O abstraction layer that enabled the green thread
10855 scheduler to do non-thread-blocking I/O has been removed, along
10856 with the libuv-based implementation employed by the green thread
10857 scheduler. This will greatly simplify the future I/O work.
10858 * `collections::btree` has been rewritten to have a more
10859 idiomatic and efficient design.
10862 * rustdoc output now indicates the stability levels of API's.
10863 * The `--crate-name` flag can specify the name of the crate
10864 being compiled, like `#[crate_name]`.
10865 * The `-C metadata` specifies additional metadata to hash into
10866 symbol names, and `-C extra-filename` specifies additional
10867 information to put into the output filename, for use by the
10868 package manager for versioning.
10869 * debug info generation has continued to improve and should be
10870 more reliable under both gdb and lldb.
10871 * rustc has experimental support for compiling in parallel
10872 using the `-C codegen-units` flag.
10873 * rustc no longer encodes rpath information into binaries by
10877 * Stack usage has been optimized with LLVM lifetime annotations.
10878 * Official Rust binaries on Linux are more compatible with older
10879 kernels and distributions, built on CentOS 5.10.
10882 Version 0.11.0 (2014-07-02)
10883 ==========================
10885 * ~1700 changes, numerous bugfixes
10888 * ~[T] has been removed from the language. This type is superseded by
10890 * ~str has been removed from the language. This type is superseded by
10892 * ~T has been removed from the language. This type is superseded by the
10894 * @T has been removed from the language. This type is superseded by the
10895 standard library's std::gc::Gc<T> type.
10896 * Struct fields are now all private by default.
10897 * Vector indices and shift amounts are both required to be a `uint`
10898 instead of any integral type.
10899 * Byte character, byte string, and raw byte string literals are now all
10900 supported by prefixing the normal literal with a `b`.
10901 * Multiple ABIs are no longer allowed in an ABI string
10902 * The syntax for lifetimes on closures/procedures has been tweaked
10903 slightly: `<'a>|A, B|: 'b + K -> T`
10904 * Floating point modulus has been removed from the language; however it
10905 is still provided by a library implementation.
10906 * Private enum variants are now disallowed.
10907 * The `priv` keyword has been removed from the language.
10908 * A closure can no longer be invoked through a &-pointer.
10909 * The `use foo, bar, baz;` syntax has been removed from the language.
10910 * The transmute intrinsic no longer works on type parameters.
10911 * Statics now allow blocks/items in their definition.
10912 * Trait bounds are separated from objects with + instead of : now.
10913 * Objects can no longer be read while they are mutably borrowed.
10914 * The address of a static is now marked as insignificant unless the
10915 #[inline(never)] attribute is placed it.
10916 * The #[unsafe_destructor] attribute is now behind a feature gate.
10917 * Struct literals are no longer allowed in ambiguous positions such as
10918 if, while, match, and for..in.
10919 * Declaration of lang items and intrinsics are now feature-gated by
10921 * Integral literals no longer default to `int`, and floating point
10922 literals no longer default to `f64`. Literals must be suffixed with an
10923 appropriate type if inference cannot determine the type of the
10925 * The Box<T> type is no longer implicitly borrowed to &mut T.
10926 * Procedures are now required to not capture borrowed references.
10929 * The standard library is now a "facade" over a number of underlying
10930 libraries. This means that development on the standard library should
10931 be speedier due to smaller crates, as well as a clearer line between
10933 * A new library, libcore, lives under the standard library's facade
10934 which is Rust's "0-assumption" library, suitable for embedded and
10935 kernel development for example.
10936 * A regex crate has been added to the standard distribution. This crate
10937 includes statically compiled regular expressions.
10938 * The unwrap/unwrap_err methods on Result require a Show bound for
10939 better error messages.
10940 * The return types of the std::comm primitives have been centralized
10941 around the Result type.
10942 * A number of I/O primitives have gained the ability to time out their
10944 * A number of I/O primitives have gained the ability to close their
10945 reading/writing halves to cancel pending operations.
10946 * Reverse iterator methods have been removed in favor of `rev()` on
10947 their forward-iteration counterparts.
10948 * A bitflags! macro has been added to enable easy interop with C and
10949 management of bit flags.
10950 * A debug_assert! macro is now provided which is disabled when
10951 `--cfg ndebug` is passed to the compiler.
10952 * A graphviz crate has been added for creating .dot files.
10953 * The std::cast module has been migrated into std::mem.
10954 * The std::local_data api has been migrated from freestanding functions
10955 to being based on methods.
10956 * The Pod trait has been renamed to Copy.
10957 * jemalloc has been added as the default allocator for types.
10958 * The API for allocating memory has been changed to use proper alignment
10959 and sized deallocation
10960 * Connecting a TcpStream or binding a TcpListener is now based on a
10961 string address and a u16 port. This allows connecting to a hostname as
10963 * The Reader trait now contains a core method, read_at_least(), which
10964 correctly handles many repeated 0-length reads.
10965 * The process-spawning API is now centered around a builder-style
10967 * The :? printing qualifier has been moved from the standard library to
10968 an external libdebug crate.
10969 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10970 have been renamed to Eq/Ord.
10971 * The select/plural methods have been removed from format!. The escapes
10972 for { and } have also changed from \{ and \} to {{ and }},
10974 * The TaskBuilder API has been re-worked to be a true builder, and
10975 extension traits for spawning native/green tasks have been added.
10978 * All breaking changes to the language or libraries now have their
10979 commit message annotated with `[breaking-change]` to allow for easy
10980 discovery of breaking changes.
10981 * The compiler will now try to suggest how to annotate lifetimes if a
10982 lifetime-related error occurs.
10983 * Debug info continues to be improved greatly with general bug fixes and
10984 better support for situations like link time optimization (LTO).
10985 * Usage of syntax extensions when cross-compiling has been fixed.
10986 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10987 -fdata-sections and --gc-sections has been enabled by default
10988 * The compiler is now stricter about where it will load module files
10989 from when a module is declared via `mod foo;`.
10990 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10991 Syntax extensions are now discovered via a "plugin registrar" type
10992 which will be extended in the future to other various plugins.
10993 * Lints have been restructured to allow for dynamically loadable lints.
10994 * A number of rustdoc improvements:
10995 * The HTML output has been visually redesigned.
10996 * Markdown is now powered by hoedown instead of sundown.
10997 * Searching heuristics have been greatly improved.
10998 * The search index has been reduced in size by a great amount.
10999 * Cross-crate documentation via `pub use` has been greatly improved.
11000 * Primitive types are now hyperlinked and documented.
11001 * Documentation has been moved from static.rust-lang.org/doc to
11003 * A new sandbox, play.rust-lang.org, is available for running and
11004 sharing rust code examples on-line.
11005 * Unused attributes are now more robustly warned about.
11006 * The dead_code lint now warns about unused struct fields.
11007 * Cross-compiling to iOS is now supported.
11008 * Cross-compiling to mipsel is now supported.
11009 * Stability attributes are now inherited by default and no longer apply
11010 to intra-crate usage, only inter-crate usage.
11011 * Error message related to non-exhaustive match expressions have been
11015 Version 0.10 (2014-04-03)
11016 =========================
11018 * ~1500 changes, numerous bugfixes
11021 * A new RFC process is now in place for modifying the language.
11022 * Patterns with `@`-pointers have been removed from the language.
11023 * Patterns with unique vectors (`~[T]`) have been removed from the
11025 * Patterns with unique strings (`~str`) have been removed from the
11027 * `@str` has been removed from the language.
11028 * `@[T]` has been removed from the language.
11029 * `@self` has been removed from the language.
11030 * `@Trait` has been removed from the language.
11031 * Headers on `~` allocations which contain `@` boxes inside the type for
11032 reference counting have been removed.
11033 * The semantics around the lifetimes of temporary expressions have changed,
11034 see #3511 and #11585 for more information.
11035 * Cross-crate syntax extensions are now possible, but feature gated. See
11036 #11151 for more information. This includes both `macro_rules!` macros as
11037 well as syntax extensions such as `format!`.
11038 * New lint modes have been added, and older ones have been turned on to be
11040 * Unnecessary parentheses
11041 * Uppercase statics
11043 * Uppercase variables
11044 * Publicly visible private types
11045 * `#[deriving]` with raw pointers
11046 * Unsafe functions can no longer be coerced to closures.
11047 * Various obscure macros such as `log_syntax!` are now behind feature gates.
11048 * The `#[simd]` attribute is now behind a feature gate.
11049 * Visibility is no longer allowed on `extern crate` statements, and
11050 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
11051 * Trailing commas are now allowed in argument lists and tuple patterns.
11052 * The `do` keyword has been removed, it is now a reserved keyword.
11053 * Default type parameters have been implemented, but are feature gated.
11054 * Borrowed variables through captures in closures are now considered soundly.
11055 * `extern mod` is now `extern crate`
11056 * The `Freeze` trait has been removed.
11057 * The `Share` trait has been added for types that can be shared among
11059 * Labels in macros are now hygienic.
11060 * Expression/statement macro invocations can be delimited with `{}` now.
11061 * Treatment of types allowed in `static mut` locations has been tweaked.
11062 * The `*` and `.` operators are now overloadable through the `Deref` and
11064 * `~Trait` and `proc` no longer have `Send` bounds by default.
11065 * Partial type hints are now supported with the `_` type marker.
11066 * An `Unsafe` type was introduced for interior mutability. It is now
11067 considered undefined to transmute from `&T` to `&mut T` without using the
11069 * The #[linkage] attribute was implemented for extern statics/functions.
11070 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
11071 * `Pod` was renamed to `Copy`.
11074 * The `libextra` library has been removed. It has now been decomposed into
11075 component libraries with smaller and more focused nuggets of
11076 functionality. The full list of libraries can be found on the
11077 documentation index page.
11078 * std: `std::condition` has been removed. All I/O errors are now propagated
11079 through the `Result` type. In order to assist with error handling, a
11080 `try!` macro for unwrapping errors with an early return and a lint for
11081 unused results has been added. See #12039 for more information.
11082 * std: The `vec` module has been renamed to `slice`.
11083 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
11084 This will become the only growable vector in the future.
11085 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
11086 are now found at `std::io::BufferedReader` instead of
11087 `std::io::buffered::BufferedReader`.
11088 * std: `print` and `println` are no longer in the prelude, the `print!` and
11089 `println!` macros are intended to be used instead.
11090 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
11091 attempts to statically prevent cycles.
11092 * std: The standard distribution is adopting the policy of pushing failure
11093 to the user rather than failing in libraries. Many functions (such as
11094 `slice::last()`) now return `Option<T>` instead of `T` + failing.
11095 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
11096 deriving mode: `#[deriving(Show)]`.
11097 * std: `ToStr` is now implemented for all types implementing `Show`.
11098 * std: The formatting trait methods now take `&self` instead of `&T`
11099 * std: The `invert()` method on iterators has been renamed to `rev()`
11100 * std: `std::num` has seen a reduction in the genericity of its traits,
11101 consolidating functionality into a few core traits.
11102 * std: Backtraces are now printed on task failure if the environment
11103 variable `RUST_BACKTRACE` is present.
11104 * std: Naming conventions for iterators have been standardized. More details
11105 can be found on the wiki's style guide.
11106 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11107 still implement the function.
11108 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11109 * std: `assert_approx_eq!` has been removed
11110 * std: The `e` and `E` formatting specifiers for floats have been added to
11111 print them in exponential notation.
11112 * std: The `Times` trait has been removed
11113 * std: Indications of variance and opting out of builtin bounds is done
11114 through marker types in `std::kinds::marker` now
11115 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11116 `#[deriving(Hash)]` is now possible.
11117 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11118 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11119 * std: `Chan::new` is now `channel()`.
11120 * std: A new synchronous channel type has been implemented.
11121 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11122 * std: `hashmap` and `trie` have been moved to `libcollections`
11123 * std: `run` has been rolled into `io::process`
11124 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11125 * std: The equality and comparison traits have seen some reorganization.
11126 * std: `rand` has moved to `librand`.
11127 * std: `to_{lower,upper}case` has been implemented for `char`.
11128 * std: Logging has been moved to `liblog`.
11129 * collections: `HashMap` has been rewritten for higher performance and less
11131 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11132 it can be booted manually. The runtime guide has more information and
11134 * native: All I/O functionality except signals has been implemented.
11135 * green: Task spawning with `libgreen` has been optimized with stack caching
11136 and various trimming of code.
11137 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11138 * sync: The `extra::sync` module has been updated to modern rust (and moved
11139 to the `sync` library), tweaking and improving various interfaces while
11140 dropping redundant functionality.
11141 * sync: A new `Barrier` type has been added to the `sync` library.
11142 * sync: An efficient mutex for native and green tasks has been implemented.
11143 * serialize: The `base64` module has seen some improvement. It treats
11144 newlines better, has non-string error values, and has seen general
11146 * fourcc: A `fourcc!` macro was introduced
11147 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11148 hexadecimal literal.
11151 * `rustpkg` has been deprecated and removed from the main repository. Its
11152 replacement, `cargo`, is under development.
11153 * Nightly builds of rust are now available
11154 * The memory usage of rustc has been improved many times throughout this
11156 * The build process supports disabling rpath support for the rustc binary
11158 * Code generation has improved in some cases, giving more information to the
11159 LLVM optimization passes to enable more extensive optimizations.
11160 * Debuginfo compatibility with lldb on OSX has been restored.
11161 * The master branch is now gated on an android bot, making building for
11162 android much more reliable.
11163 * Output flags have been centralized into one `--emit` flag.
11164 * Crate type flags have been centralized into one `--crate-type` flag.
11165 * Codegen flags have been consolidated behind a `-C` flag.
11166 * Linking against outdated crates now has improved error messages.
11167 * Error messages with lifetimes will often suggest how to annotate the
11168 function to fix the error.
11169 * Many more types are documented in the standard library, and new guides
11171 * Many `rustdoc` improvements:
11172 * code blocks are syntax highlighted.
11173 * render standalone markdown files.
11174 * the --test flag tests all code blocks by default.
11175 * exported macros are displayed.
11176 * re-exported types have their documentation inlined at the location of the
11178 * search works across crates that have been rendered to the same output
11182 Version 0.9 (2014-01-09)
11183 ==========================
11185 * ~1800 changes, numerous bugfixes
11188 * The `float` type has been removed. Use `f32` or `f64` instead.
11189 * A new facility for enabling experimental features (feature gating) has
11190 been added, using the crate-level `#[feature(foo)]` attribute.
11191 * Managed boxes (@) are now behind a feature gate
11192 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11193 standard library's `Gc` or `Rc` types instead.
11194 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11195 * Jumping back to the top of a loop is now done with `continue` instead of
11197 * Strings can no longer be mutated through index assignment.
11198 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11199 hash delimiters, as in `r###"foo"###`.
11200 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11202 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11203 * `@fn`s have been removed.
11204 * `do` only works with procs in order to make it obvious what the cost
11206 * Single-element tuple-like structs can no longer be dereferenced to
11207 obtain the inner value. A more comprehensive solution for overloading
11208 the dereference operator will be provided in the future.
11209 * The `#[link(...)]` attribute has been replaced with
11210 `#[crate_id = "name#vers"]`.
11211 * Empty `impl`s must be terminated with empty braces and may not be
11212 terminated with a semicolon.
11213 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11214 no longer has any special meaning.
11215 * The old `fmt!` string formatting macro has been removed.
11216 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11217 `print!` and `println!`.
11218 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11219 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11220 `extern mod foo = "bar"` instead.
11221 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11222 * Macros can have attributes.
11223 * Macros can expand to items with attributes.
11224 * Macros can expand to multiple items.
11225 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11226 * Comments may be nested.
11227 * Values automatically coerce to trait objects they implement, without
11229 * Enum discriminants are no longer an entire word but as small as needed to
11230 contain all the variants. The `repr` attribute can be used to override
11231 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11232 `#[repr(C)]` to match C enums.
11233 * Non-string literals are not allowed in attributes (they never worked).
11234 * The FFI now supports variadic functions.
11235 * Octal numeric literals, as in `0o7777`.
11236 * The `concat!` syntax extension performs compile-time string concatenation.
11237 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11238 removed as Rust no longer uses segmented stacks.
11239 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11240 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11241 not `*`; ignoring remaining fields of a struct is also done with `..`,
11242 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11243 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11244 * `rustc` supports the "system" calling convention, which defaults to the
11245 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11247 * The `type_overflow` lint (default: warn) checks literals for overflow.
11248 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11249 * The `attribute_usage` lint (default: warn) warns about unknown
11251 * The `unknown_features` lint (default: warn) warns about unknown
11253 * The `dead_code` lint (default: warn) checks for dead code.
11254 * Rust libraries can be linked statically to one another
11255 * `#[link_args]` is behind the `link_args` feature gate.
11256 * Native libraries are now linked with `#[link(name = "foo")]`
11257 * Native libraries can be statically linked to a rust crate
11258 (`#[link(name = "foo", kind = "static")]`).
11259 * Native OS X frameworks are now officially supported
11260 (`#[link(name = "foo", kind = "framework")]`).
11261 * The `#[thread_local]` attribute creates thread-local (not task-local)
11262 variables. Currently behind the `thread_local` feature gate.
11263 * The `return` keyword may be used in closures.
11264 * Types that can be copied via a memcpy implement the `Pod` kind.
11265 * The `cfg` attribute can now be used on struct fields and enum variants.
11268 * std: The `option` and `result` API's have been overhauled to make them
11269 simpler, more consistent, and more composable.
11270 * std: The entire `std::io` module has been replaced with one that is
11271 more comprehensive and that properly interfaces with the underlying
11272 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11274 * std: `io::util` contains a number of useful implementations of
11275 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11276 `ZeroReader`, `TeeReader`.
11277 * std: The reference counted pointer type `extra::rc` moved into std.
11278 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11279 just a wrapper around it).
11280 * std: The `Either` type has been removed.
11281 * std: `fmt::Default` can be implemented for any type to provide default
11282 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11283 * std: The `rand` API continues to be tweaked.
11284 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11285 on failure in gdb, is now named `rust_fail`.
11286 * std: The `each_key` and `each_value` methods on `HashMap` have been
11287 replaced by the `keys` and `values` iterators.
11288 * std: Functions dealing with type size and alignment have moved from the
11289 `sys` module to the `mem` module.
11290 * std: The `path` module was written and API changed.
11291 * std: `str::from_utf8` has been changed to cast instead of allocate.
11292 * std: `starts_with` and `ends_with` methods added to vectors via the
11293 `ImmutableEqVector` trait, which is in the prelude.
11294 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11295 if the index is out of bounds.
11296 * std: Task failure no longer propagates between tasks, as the model was
11297 complex, expensive, and incompatible with thread-based tasks.
11298 * std: The `Any` type can be used for dynamic typing.
11299 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11301 * std: Methods that produce iterators generally do not have an `_iter`
11303 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11304 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11305 * std: `util::ignore` renamed to `prelude::drop`.
11306 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11308 * std: `vec::raw` has seen a lot of cleanup and API changes.
11309 * std: The standard library no longer includes any C++ code, and very
11310 minimal C, eliminating the dependency on libstdc++.
11311 * std: Runtime scheduling and I/O functionality has been factored out into
11312 extensible interfaces and is now implemented by two different crates:
11313 libnative, for native threading and I/O; and libgreen, for green threading
11314 and I/O. This paves the way for using the standard library in more limited
11315 embedded environments.
11316 * std: The `comm` module has been rewritten to be much faster, have a
11317 simpler, more consistent API, and to work for both native and green
11319 * std: All libuv dependencies have been moved into the rustuv crate.
11320 * native: New implementations of runtime scheduling on top of OS threads.
11321 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11323 * green: The green thread scheduler and message passing types are almost
11324 entirely lock-free.
11325 * extra: The `flatpipes` module had bitrotted and was removed.
11326 * extra: All crypto functions have been removed and Rust now has a policy of
11327 not reimplementing crypto in the standard library. In the future crypto
11328 will be provided by external crates with bindings to established libraries.
11329 * extra: `c_vec` has been modernized.
11330 * extra: The `sort` module has been removed. Use the `sort` method on
11334 * The `rust` and `rusti` commands have been removed, due to lack of
11336 * `rustdoc` was completely rewritten.
11337 * `rustdoc` can test code examples in documentation.
11338 * `rustpkg` can test packages with the argument, 'test'.
11339 * `rustpkg` supports arbitrary dependencies, including C libraries.
11340 * `rustc`'s support for generating debug info is improved again.
11341 * `rustc` has better error reporting for unbalanced delimiters.
11342 * `rustc`'s JIT support was removed due to bitrot.
11343 * Executables and static libraries can be built with LTO (-Z lto)
11344 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11348 Version 0.8 (2013-09-26)
11349 ============================
11351 * ~2200 changes, numerous bugfixes
11354 * The `for` loop syntax has changed to work with the `Iterator` trait.
11355 * At long last, unwinding works on Windows.
11356 * Default methods are ready for use.
11357 * Many trait inheritance bugs fixed.
11358 * Owned and borrowed trait objects work more reliably.
11359 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11360 * rustc can omit emission of code for the `debug!` macro if it is passed
11362 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11363 for foo.rs, then foo/mod.rs, and will generate an error when both are
11365 * Strings no longer contain trailing nulls. The new `std::c_str` module
11366 provides new mechanisms for converting to C strings.
11367 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11368 * The FFI has been overhauled such that foreign functions are called directly,
11369 instead of through a stack-switching wrapper.
11370 * Calling a foreign function must be done through a Rust function with the
11371 `#[fixed_stack_segment]` attribute.
11372 * The `externfn!` macro can be used to declare both a foreign function and
11373 a `#[fixed_stack_segment]` wrapper at once.
11374 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11375 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11376 * `priv` is disallowed everywhere except for struct fields and enum variants.
11377 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11378 * `ref` bindings in irrefutable patterns work correctly now.
11379 * `char` is now prevented from containing invalid code points.
11380 * Casting to `bool` is no longer allowed.
11381 * `\0` is now accepted as an escape in chars and strings.
11382 * `yield` is a reserved keyword.
11383 * `typeof` is a reserved keyword.
11384 * Crates may be imported by URL with `extern mod foo = "url";`.
11385 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11386 * Static vectors can be initialized with repeating elements,
11387 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11388 * Static structs can be initialized with functional record update,
11389 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11390 * `cfg!` can be used to conditionally execute code based on the crate
11391 configuration, similarly to `#[cfg(...)]`.
11392 * The `unnecessary_qualification` lint detects unneeded module
11393 prefixes (default: allow).
11394 * Arithmetic operations have been implemented on the SIMD types in
11395 `std::unstable::simd`.
11396 * Exchange allocation headers were removed, reducing memory usage.
11397 * `format!` implements a completely new, extensible, and higher-performance
11398 string formatting system. It will replace `fmt!`.
11399 * `print!` and `println!` write formatted strings (using the `format!`
11400 extension) to stdout.
11401 * `write!` and `writeln!` write formatted strings (using the `format!`
11402 extension) to the new Writers in `std::rt::io`.
11403 * The library section in which a function or static is placed may
11404 be specified with `#[link_section = "..."]`.
11405 * The `proto!` syntax extension for defining bounded message protocols
11407 * `macro_rules!` is hygienic for `let` declarations.
11408 * The `#[export_name]` attribute specifies the name of a symbol.
11409 * `unreachable!` can be used to indicate unreachable code, and fails
11413 * std: Transitioned to the new runtime, written in Rust.
11414 * std: Added an experimental I/O library, `rt::io`, based on the new
11416 * std: A new generic `range` function was added to the prelude, replacing
11417 `uint::range` and friends.
11418 * std: `range_rev` no longer exists. Since range is an iterator it can be
11419 reversed with `range(lo, hi).invert()`.
11420 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11421 renamed to `unwrap_or`.
11422 * std: The `iterator` module was renamed to `iter`.
11423 * std: Integral types now support the `checked_add`, `checked_sub`, and
11424 `checked_mul` operations for detecting overflow.
11425 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11427 * std: Methods are standardizing on conventions for casting methods:
11428 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11430 * std: The `CString` type in `c_str` provides new ways to convert to and
11432 * std: `DoubleEndedIterator` can yield elements in two directions.
11433 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11435 * std: `str::from_bytes` renamed to `str::from_utf8`.
11436 * std: `pop_opt` and `shift_opt` methods added to vectors.
11437 * std: The task-local data interface no longer uses @, and keys are
11438 no longer function pointers.
11439 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11440 * std: Added `SharedPort` to `comm`.
11441 * std: `Eq` has a default method for `ne`; only `eq` is required
11442 in implementations.
11443 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11444 is required in implementations.
11445 * std: `is_utf8` performance is improved, impacting many string functions.
11446 * std: `os::MemoryMap` provides cross-platform mmap.
11447 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11448 are not 'in-bounds' are considered undefined.
11449 * std: Many freestanding functions in `vec` removed in favor of methods.
11450 * std: Many freestanding functions on scalar types removed in favor of
11452 * std: Many options to task builders were removed since they don't make
11453 sense in the new scheduler design.
11454 * std: More containers implement `FromIterator` so can be created by the
11456 * std: More complete atomic types in `unstable::atomics`.
11457 * std: `comm::PortSet` removed.
11458 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11459 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11460 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11461 default implementations.
11462 * std: Various `from_str` functions were removed in favor of a generic
11463 `from_str` which is available in the prelude.
11464 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11465 * extra: `dlist`, the doubly-linked list was modernized.
11466 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11467 * extra: Added `glob` module, replacing `std::os::glob`.
11468 * extra: `rope` was removed.
11469 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11470 * extra: `net`, and `timer` were removed. The experimental replacements
11471 are `std::rt::io::net` and `std::rt::io::timer`.
11472 * extra: Iterators implemented for `SmallIntMap`.
11473 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11474 * extra: `SmallIntSet` removed. Use `BitvSet`.
11475 * extra: Performance of JSON parsing greatly improved.
11476 * extra: `semver` updated to SemVer 2.0.0.
11477 * extra: `term` handles more terminals correctly.
11478 * extra: `dbg` module removed.
11479 * extra: `par` module removed.
11480 * extra: `future` was cleaned up, with some method renames.
11481 * extra: Most free functions in `getopts` were converted to methods.
11484 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11485 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11486 similarly to gcc's `--march` flag.
11487 * rustc's performance compiling small crates is much better.
11488 * rustpkg has received many improvements.
11489 * rustpkg supports git tags as package IDs.
11490 * rustpkg builds into target-specific directories so it can be used for
11492 * The number of concurrent test tasks is controlled by the environment
11493 variable RUST_TEST_TASKS.
11494 * The test harness can now report metrics for benchmarks.
11495 * All tools have man pages.
11496 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11497 * The runtime uses jemalloc for allocations.
11498 * Segmented stacks are temporarily disabled as part of the transition to
11499 the new runtime. Stack overflows are possible!
11500 * A new documentation backend, rustdoc_ng, is available for use. It is
11501 still invoked through the normal `rustdoc` command.
11504 Version 0.7 (2013-07-03)
11505 =======================
11507 * ~2000 changes, numerous bugfixes
11510 * `impl`s no longer accept a visibility qualifier. Put them on methods
11512 * The borrow checker has been rewritten with flow-sensitivity, fixing
11513 many bugs and inconveniences.
11514 * The `self` parameter no longer implicitly means `&'self self`,
11515 and can be explicitly marked with a lifetime.
11516 * Overloadable compound operators (`+=`, etc.) have been temporarily
11517 removed due to bugs.
11518 * The `for` loop protocol now requires `for`-iterators to return `bool`
11519 so they compose better.
11520 * The `Durable` trait is replaced with the `'static` bounds.
11521 * Trait default methods work more often.
11522 * Structs with the `#[packed]` attribute have byte alignment and
11523 no padding between fields.
11524 * Type parameters bound by `Copy` must now be copied explicitly with
11525 the `copy` keyword.
11526 * It is now illegal to move out of a dereferenced unsafe pointer.
11527 * `Option<~T>` is now represented as a nullable pointer.
11528 * `@mut` does dynamic borrow checks correctly.
11529 * The `main` function is only detected at the topmost level of the crate.
11530 The `#[main]` attribute is still valid anywhere.
11531 * Struct fields may no longer be mutable. Use inherited mutability.
11532 * The `#[no_send]` attribute makes a type that would otherwise be
11534 * The `#[no_freeze]` attribute makes a type that would otherwise be
11536 * Unbounded recursion will abort the process after reaching the limit
11537 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11538 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11539 are never implicitly copyable.
11540 * `#[static_assert]` makes compile-time assertions about static bools.
11541 * At long last, 'argument modes' no longer exist.
11542 * The rarely used `use mod` statement no longer exists.
11544 * Syntax extensions
11545 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11547 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11548 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11549 `#[deriving(...)]`.
11550 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11551 and unsuffixed integer literals.
11554 * The `core` crate was renamed to `std`.
11555 * The `std` crate was renamed to `extra`.
11556 * More and improved documentation.
11557 * std: `iterator` module for external iterator objects.
11558 * Many old-style (internal, higher-order function) iterators replaced by
11559 implementations of `Iterator`.
11560 * std: Many old internal vector and string iterators,
11561 incl. `any`, `all`. removed.
11562 * std: The `finalize` method of `Drop` renamed to `drop`.
11563 * std: The `drop` method now takes `&mut self` instead of `&self`.
11564 * std: The prelude no longer re-exports any modules, only types and traits.
11565 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11566 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11567 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11568 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11569 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11570 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11571 * std: Many types implement `Clone`.
11572 * std: `path` type renamed to `Path`.
11573 * std: `mut` module and `Mut` type removed.
11574 * std: Many standalone functions removed in favor of methods and iterators
11575 in `vec`, `str`. In the future methods will also work as functions.
11576 * std: `reinterpret_cast` removed. Use `transmute`.
11577 * std: ascii string handling in `std::ascii`.
11578 * std: `Rand` is implemented for ~/@.
11579 * std: `run` module for spawning processes overhauled.
11580 * std: Various atomic types added to `unstable::atomic`.
11581 * std: Various types implement `Zero`.
11582 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11583 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11584 * std: Added `os::mkdir_recursive`.
11585 * std: Added `os::glob` function performs filesystems globs.
11586 * std: `FuzzyEq` renamed to `ApproxEq`.
11587 * std: `Map` now defines `pop` and `swap` methods.
11588 * std: `Cell` constructors converted to static methods.
11589 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11590 * extra: `flate` module moved from `std` to `extra`.
11591 * extra: `fileinput` module for iterating over a series of files.
11592 * extra: `Complex` number type and `complex` module.
11593 * extra: `Rational` number type and `rational` module.
11594 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11595 * extra: `term` uses terminfo now, is more correct.
11596 * extra: `arc` functions converted to methods.
11597 * extra: Implementation of fixed output size variations of SHA-2.
11600 * `unused_variables` lint mode for unused variables (default: warn).
11601 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11603 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11605 * `dead_assignment` lint mode for unread variables (default: warn).
11606 * `unnecessary_allocation` lint mode detects some heap allocations that are
11607 immediately borrowed so could be written without allocating (default: warn).
11608 * `missing_doc` lint mode (default: allow).
11609 * `unreachable_code` lint mode (default: warn).
11610 * The `rusti` command has been rewritten and a number of bugs addressed.
11611 * rustc outputs in color on more terminals.
11612 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11613 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11614 * Compiling with `-g` will make the binary record information about
11615 dynamic borrowcheck failures for debugging.
11616 * rustdoc has a nicer stylesheet.
11617 * Various improvements to rustdoc.
11618 * Improvements to rustpkg (see the detailed release notes).
11621 Version 0.6 (2013-04-03)
11622 ========================
11624 * ~2100 changes, numerous bugfixes
11627 * The self type parameter in traits is now spelled `Self`
11628 * The `self` parameter in trait and impl methods must now be explicitly
11629 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11630 * Static methods no longer require the `static` keyword and instead
11631 are distinguished by the lack of a `self` parameter
11632 * Replaced the `Durable` trait with the `'static` lifetime
11633 * The old closure type syntax with the trailing sigil has been
11634 removed in favor of the more consistent leading sigil
11635 * `super` is a keyword, and may be prefixed to paths
11636 * Trait bounds are separated with `+` instead of whitespace
11637 * Traits are implemented with `impl Trait for Type`
11638 instead of `impl Type: Trait`
11639 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11640 * The `export` keyword has finally been removed
11641 * The `move` keyword has been removed (see "Semantic changes")
11642 * The interior mutability qualifier on vectors, `[mut T]`, has been
11643 removed. Use `&mut [T]`, etc.
11644 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11645 * `fail` is no longer a keyword. Use `fail!()`
11646 * `assert` is no longer a keyword. Use `assert!()`
11647 * `log` is no longer a keyword. use `debug!`, etc.
11648 * 1-tuples may be represented as `(T,)`
11649 * Struct fields may no longer be `mut`. Use inherited mutability,
11650 `@mut T`, `core::mut` or `core::cell`
11651 * `extern mod { ... }` is no longer valid syntax for foreign
11652 function modules. Use extern blocks: `extern { ... }`
11653 * Newtype enums removed. Use tuple-structs.
11654 * Trait implementations no longer support visibility modifiers
11655 * Pattern matching over vectors improved and expanded
11656 * `const` renamed to `static` to correspond to lifetime name,
11657 and make room for future `static mut` unsafe mutable globals.
11658 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11659 * `Clone` implementations can be automatically generated with
11660 `#[deriving(Clone)]`
11661 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11662 instead of `foo as Bar`.
11663 * Fixed length vector types are now written as `[int, .. 3]`
11664 instead of `[int * 3]`.
11665 * Fixed length vector types can express the length as a constant
11666 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11669 * Types with owned pointers or custom destructors move by default,
11670 eliminating the `move` keyword
11671 * All foreign functions are considered unsafe
11672 * &mut is now unaliasable
11673 * Writes to borrowed @mut pointers are prevented dynamically
11675 * The name of the main function can be customized using #[main]
11676 * The default type of an inferred closure is &fn instead of @fn
11677 * `use` statements may no longer be "chained" - they cannot import
11678 identifiers imported by previous `use` statements
11679 * `use` statements are crate relative, importing from the "top"
11680 of the crate by default. Paths may be prefixed with `super::`
11681 or `self::` to change the search behavior.
11682 * Method visibility is inherited from the implementation declaration
11683 * Structural records have been removed
11684 * Many more types can be used in static items, including enums
11685 'static-lifetime pointers and vectors
11686 * Pattern matching over vectors improved and expanded
11687 * Typechecking of closure types has been overhauled to
11688 improve inference and eliminate unsoundness
11689 * Macros leave scope at the end of modules, unless that module is
11690 tagged with #[macro_escape]
11693 * Added big integers to `std::bigint`
11694 * Removed `core::oldcomm` module
11695 * Added pipe-based `core::comm` module
11696 * Numeric traits have been reorganized under `core::num`
11697 * `vec::slice` finally returns a slice
11698 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11699 * Containers reorganized around traits in `core::container`
11700 * `core::dvec` removed, `~[T]` is a drop-in replacement
11701 * `core::send_map` renamed to `core::hashmap`
11702 * `std::map` removed; replaced with `core::hashmap`
11703 * `std::treemap` reimplemented as an owned balanced tree
11704 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11705 * `core::trie` added as a fast ordered map for integer keys
11706 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11707 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11708 overload the comparison operators, whereas `TotalOrd` is used
11709 by certain container types
11712 * Replaced the 'cargo' package manager with 'rustpkg'
11713 * Added all-purpose 'rust' tool
11714 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11715 * rustc now *attempts* to offer spelling suggestions
11716 * Improved support for ARM and Android
11717 * Preliminary MIPS backend
11718 * Improved foreign function ABI implementation for x86, x86_64
11719 * Various memory usage improvements
11720 * Rust code may be embedded in foreign code under limited circumstances
11721 * Inline assembler supported by new asm!() syntax extension.
11724 Version 0.5 (2012-12-21)
11725 ===========================
11727 * ~900 changes, numerous bugfixes
11730 * Removed `<-` move operator
11731 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11732 * Removed old fixed length vector syntax - `[T]/N`
11733 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11734 * Macros may now expand to items and statements
11735 * `a.b()` is always parsed as a method call, never as a field projection
11736 * `Eq` and `IterBytes` implementations can be automatically generated
11737 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11738 * Removed the special crate language for `.rc` files
11739 * Function arguments may consist of any irrefutable pattern
11742 * `&` and `~` pointers may point to objects
11743 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11744 * Enum variants may be structs
11745 * Destructors can be added to all nominal types with the Drop trait
11746 * Structs and nullary enum variants may be constants
11747 * Values that cannot be implicitly copied are now automatically moved
11748 without writing `move` explicitly
11749 * `&T` may now be coerced to `*T`
11750 * Coercions happen in `let` statements as well as function calls
11751 * `use` statements now take crate-relative paths
11752 * The module and type namespaces have been merged so that static
11753 method names can be resolved under the trait in which they are
11756 * Improved support for language features
11757 * Trait inheritance works in many scenarios
11758 * More support for explicit self arguments in methods - `self`, `&self`
11759 `@self`, and `~self` all generally work as expected
11760 * Static methods work in more situations
11761 * Experimental: Traits may declare default methods for the implementations
11765 * New condition handling system in `core::condition`
11766 * Timsort added to `std::sort`
11767 * New priority queue, `std::priority_queue`
11768 * Pipes for serializable types, `std::flatpipes'
11769 * Serialization overhauled to be trait-based
11770 * Expanded `getopts` definitions
11771 * Moved futures to `std`
11772 * More functions are pure now
11773 * `core::comm` renamed to `oldcomm`. Still deprecated
11774 * `rustdoc` and `cargo` are libraries now
11777 * Added a preliminary REPL, `rusti`
11778 * License changed from MIT to dual MIT/APL2
11781 Version 0.4 (2012-10-15)
11782 ==========================
11784 * ~2000 changes, numerous bugfixes
11787 * All keywords are now strict and may not be used as identifiers anywhere
11788 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11789 'of', 'with', 'to', 'class'.
11790 * Classes are replaced with simpler structs
11791 * Explicit method self types
11792 * `ret` became `return` and `alt` became `match`
11793 * `import` is now `use`; `use is now `extern mod`
11794 * `extern mod { ... }` is now `extern { ... }`
11795 * `use mod` is the recommended way to import modules
11796 * `pub` and `priv` replace deprecated export lists
11797 * The syntax of `match` pattern arms now uses fat arrow (=>)
11798 * `main` no longer accepts an args vector; use `os::args` instead
11801 * Trait implementations are now coherent, ala Haskell typeclasses
11802 * Trait methods may be static
11803 * Argument modes are deprecated
11804 * Borrowed pointers are much more mature and recommended for use
11805 * Strings and vectors in the static region are stored in constant memory
11806 * Typestate was removed
11807 * Resolution rewritten to be more reliable
11808 * Support for 'dual-mode' data structures (freezing and thawing)
11811 * Most binary operators can now be overloaded via the traits in
11813 * `std::net::url` for representing URLs
11814 * Sendable hash maps in `core::send_map`
11815 * `core::task' gained a (currently unsafe) task-local storage API
11818 * An efficient new intertask communication primitive called the pipe,
11819 along with a number of higher-level channel types, in `core::pipes`
11820 * `std::arc`, an atomically reference counted, immutable, shared memory
11822 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11823 * Futures are now based on pipes and sendable
11824 * More robust linked task failure
11825 * Improved task builder API
11828 * Improved error reporting
11829 * Preliminary JIT support
11830 * Preliminary work on precise GC
11831 * Extensive architectural improvements to rustc
11832 * Begun a transition away from buggy C++-based reflection (shape) code to
11833 Rust-based (visitor) code
11834 * All hash functions and tables converted to secure, randomized SipHash
11837 Version 0.3 (2012-07-12)
11838 ========================
11840 * ~1900 changes, numerous bugfixes
11842 * New coding conveniences
11843 * Integer-literal suffix inference
11844 * Per-item control over warnings, errors
11845 * #[cfg(windows)] and #[cfg(unix)] attributes
11846 * Documentation comments
11847 * More compact closure syntax
11848 * 'do' expressions for treating higher-order functions as
11850 * *-patterns (wildcard extended to all constructor fields)
11853 * Name resolution pass and exhaustiveness checker rewritten
11854 * Region pointers and borrow checking supersede alias
11856 * Init-ness checking is now provided by a region-based liveness
11857 pass instead of the typestate pass; same for last-use analysis
11858 * Extensive work on region pointers
11860 * Experimental new language features
11861 * Slices and fixed-size, interior-allocated vectors
11862 * #!-comments for lang versioning, shell execution
11863 * Destructors and iface implementation for classes;
11864 type-parameterized classes and class methods
11865 * 'const' type kind for types that can be used to implement
11866 shared-memory concurrency patterns
11870 * Removal of various obsolete features
11871 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11872 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11874 * Constructs: do-while loops ('do' repurposed), fn binding,
11875 resources (replaced by destructors)
11877 * Compiler reorganization
11878 * Syntax-layer of compiler split into separate crate
11879 * Clang (from LLVM project) integrated into build
11880 * Typechecker split into sub-modules
11883 * New time functions
11884 * Extension methods for many built-in types
11885 * Arc: atomic-refcount read-only / exclusive-use shared cells
11886 * Par: parallel map and search routines
11887 * Extensive work on libuv interface
11888 * Much vector code moved to libraries
11889 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11890 #include, #include_str, #include_bin
11892 * Tool improvements
11893 * Cargo automatically resolves dependencies
11896 Version 0.2 (2012-03-29)
11897 =========================
11899 * >1500 changes, numerous bugfixes
11901 * New docs and doc tooling
11903 * New port: FreeBSD x86_64
11905 * Compilation model enhancements
11906 * Generics now specialized, multiply instantiated
11907 * Functions now inlined across separate crates
11909 * Scheduling, stack and threading fixes
11910 * Noticeably improved message-passing performance
11911 * Explicit schedulers
11915 * Experimental new language features
11916 * Operator overloading
11920 * Various language extensions
11921 * C-callback function types: 'crust fn ...'
11922 * Infinite-loop construct: 'loop { ... }'
11923 * Shorten 'mutable' to 'mut'
11924 * Required mutable-local qualifier: 'let mut ...'
11925 * Basic glob-exporting: 'export foo::*;'
11926 * Alt now exhaustive, 'alt check' for runtime-checked
11927 * Block-function form of 'for' loop, with 'break' and 'ret'.
11930 * AST quasi-quote syntax extension
11931 * Revived libuv interface
11932 * New modules: core::{future, iter}, std::arena
11933 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11934 * Extensive cleanup, regularization in libstd, libcore
11937 Version 0.1 (2012-01-20)
11938 ===============================
11940 * Most language features work, including:
11941 * Unique pointers, unique closures, move semantics
11942 * Interface-constrained generics
11943 * Static interface dispatch
11945 * Multithread task scheduling
11946 * Typestate predicates
11947 * Failure unwinding, destructors
11948 * Pattern matching and destructuring assignment
11949 * Lightweight block-lambda syntax
11950 * Preliminary macro-by-example
11952 * Compiler works with the following configurations:
11953 * Linux: x86 and x86_64 hosts and targets
11954 * macOS: x86 and x86_64 hosts and targets
11955 * Windows: x86 hosts and targets
11957 * Cross compilation / multi-target configuration supported.
11959 * Preliminary API-documentation and package-management tools included.
11963 * Documentation is incomplete.
11965 * Performance is below intended target.
11967 * Standard library APIs are subject to extensive change, reorganization.
11969 * Language-level versioning is not yet operational - future code will
11970 break unexpectedly.