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`, `let_underscore_lock`, and `let_underscore_must_use` 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.
94 These changes do not affect any public interfaces of Rust, but they represent
95 significant improvements to the performance or internals of rustc and related
98 - [Add `x.sh` and `x.ps1` shell scripts](https://github.com/rust-lang/rust/pull/99992/)
99 - [compiletest: use target cfg instead of hard-coded tables](https://github.com/rust-lang/rust/pull/100260/)
100 - [Use object instead of LLVM for reading bitcode from rlibs](https://github.com/rust-lang/rust/pull/98100/)
101 - [Enable MIR inlining for optimized compilations](https://github.com/rust-lang/rust/pull/91743)
102 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).
104 Version 1.64.0 (2022-09-22)
105 ===========================
109 - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
110 - 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/)
111 - 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.
115 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
116 - Refer to Rust's [platform support page][platform-support-doc] for more
117 information on Rust's tiered platform support.
118 - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
119 - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
120 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
124 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
125 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
126 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
127 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
128 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
129 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
130 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
131 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
136 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
137 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
138 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
139 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
140 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
141 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
142 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
143 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
144 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
145 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
146 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
147 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
148 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
149 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
150 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
151 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
152 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
153 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
154 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
156 These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
158 - [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
159 - [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
160 - [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
161 - [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
162 - [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
163 - [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
165 These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
167 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
168 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
169 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
170 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
171 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
172 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
173 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
174 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
175 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
176 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
177 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
178 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
179 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
181 These APIs are now usable in const contexts:
183 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
187 - [Packages can now inherit settings from the workspace so that the settings
188 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
189 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
191 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
192 for more details on how to define these common settings.
193 - [Cargo commands can now accept multiple `--target` flags to build for
194 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
195 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
196 config option may now take an array of multiple targets.
197 - [The `--jobs` argument can now take a negative number to count backwards from
198 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
199 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
200 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
201 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
202 flag to `cargo rustc` to override the crate type.
203 - [Significantly improved the performance fetching git dependencies from GitHub
204 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
208 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
212 - 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/)
213 - [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.
214 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
215 - [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.
216 - [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.
217 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
218 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
219 - 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/).
220 - [`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.
225 These changes do not affect any public interfaces of Rust, but they represent
226 significant improvements to the performance or internals of rustc and related
229 - 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/)
230 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
231 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
232 - Many improvements to generated code for derives, including performance improvements:
233 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
234 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
235 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
236 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
237 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
238 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
239 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
240 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
241 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
242 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
243 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
245 Version 1.63.0 (2022-08-11)
246 ==========================
250 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
251 - [Modify MIR building to drop repeat expressions with length zero.][95953]
252 - [Remove label/lifetime shadowing warnings.][96296]
253 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
254 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
255 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
256 - [lub: don't bail out due to empty binders.][97867]
260 - [Stabilize the `bundle` native library modifier,][95818] also removing the
261 deprecated `static-nobundle` linking kind.
262 - [Add Apple WatchOS compile targets\*.][95243]
263 - [Add a Windows application manifest to rustc-main.][96737]
265 \* Refer to Rust's [platform support page][platform-support-doc] for more
266 information on Rust's tiered platform support.
270 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
271 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
272 - [`impl Read and Write for VecDeque<u8>`.][95632]
273 - [STD support for the Nintendo 3DS.][95897]
274 - [Use rounding in float to Duration conversion methods.][96051]
275 - [Make write/print macros eagerly drop temporaries.][96455]
276 - [Implement internal traits that enable `[OsStr]::join`.][96881]
277 - [Implement `Hash` for `core::alloc::Layout`.][97034]
278 - [Add capacity documentation for `OsString`.][97202]
279 - [Put a bound on collection misbehavior.][97316]
280 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
281 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
282 - [Document Rust's stance on `/proc/self/mem`.][97837]
289 - [`BinaryHeap::try_reserve`]
290 - [`BinaryHeap::try_reserve_exact`]
291 - [`OsString::try_reserve`]
292 - [`OsString::try_reserve_exact`]
293 - [`PathBuf::try_reserve`]
294 - [`PathBuf::try_reserve_exact`]
295 - [`Path::try_exists`]
296 - [`Ref::filter_map`]
297 - [`RefMut::filter_map`]
298 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
299 - [`ToOwned::clone_into`]
300 - [`Ipv6Addr::to_ipv4_mapped`]
302 - [`unix::io::BorrowedFd<'fd>`]
303 - [`unix::io::OwnedFd`]
304 - [`windows::io::AsHandle`]
305 - [`windows::io::BorrowedHandle<'handle>`]
306 - [`windows::io::OwnedHandle`]
307 - [`windows::io::HandleOrInvalid`]
308 - [`windows::io::HandleOrNull`]
309 - [`windows::io::InvalidHandleError`]
310 - [`windows::io::NullHandleError`]
311 - [`windows::io::AsSocket`]
312 - [`windows::io::BorrowedSocket<'handle>`]
313 - [`windows::io::OwnedSocket`]
316 - [`thread::ScopedJoinHandle`]
318 These APIs are now usable in const contexts:
320 - [`array::from_ref`]
321 - [`slice::from_ref`]
322 - [`intrinsics::copy`]
323 - [`intrinsics::copy_nonoverlapping`]
324 - [`<*const T>::copy_to`]
325 - [`<*const T>::copy_to_nonoverlapping`]
326 - [`<*mut T>::copy_to`]
327 - [`<*mut T>::copy_to_nonoverlapping`]
328 - [`<*mut T>::copy_from`]
329 - [`<*mut T>::copy_from_nonoverlapping`]
331 - [`Utf8Error::error_len`]
332 - [`Utf8Error::valid_up_to`]
339 - [Stabilize the `--config path` command-line argument.][cargo/10755]
340 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
345 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
346 errors for invalid attribute arguments that were previously ignored.
347 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
348 duration can differ slightly from what it was.
353 These changes provide no direct user facing benefits, but represent significant
354 improvements to the internals and overall performance of rustc
357 - [Prepare Rust for LLVM opaque pointers.][94214]
359 [94214]: https://github.com/rust-lang/rust/pull/94214/
360 [94530]: https://github.com/rust-lang/rust/pull/94530/
361 [94954]: https://github.com/rust-lang/rust/pull/94954/
362 [95243]: https://github.com/rust-lang/rust/pull/95243/
363 [95565]: https://github.com/rust-lang/rust/pull/95565/
364 [95632]: https://github.com/rust-lang/rust/pull/95632/
365 [95818]: https://github.com/rust-lang/rust/pull/95818/
366 [95897]: https://github.com/rust-lang/rust/pull/95897/
367 [95953]: https://github.com/rust-lang/rust/pull/95953/
368 [96051]: https://github.com/rust-lang/rust/pull/96051/
369 [96296]: https://github.com/rust-lang/rust/pull/96296/
370 [96455]: https://github.com/rust-lang/rust/pull/96455/
371 [96737]: https://github.com/rust-lang/rust/pull/96737/
372 [96868]: https://github.com/rust-lang/rust/pull/96868/
373 [96881]: https://github.com/rust-lang/rust/pull/96881/
374 [96885]: https://github.com/rust-lang/rust/pull/96885/
375 [96959]: https://github.com/rust-lang/rust/pull/96959/
376 [97034]: https://github.com/rust-lang/rust/pull/97034/
377 [97202]: https://github.com/rust-lang/rust/pull/97202/
378 [97316]: https://github.com/rust-lang/rust/pull/97316/
379 [97652]: https://github.com/rust-lang/rust/pull/97652/
380 [97675]: https://github.com/rust-lang/rust/pull/97675/
381 [97803]: https://github.com/rust-lang/rust/pull/97803/
382 [97837]: https://github.com/rust-lang/rust/pull/97837/
383 [97867]: https://github.com/rust-lang/rust/pull/97867/
384 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
385 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
387 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
388 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
389 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
390 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
391 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
392 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
393 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
394 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
395 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
396 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
397 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
398 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
399 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
400 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
401 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
402 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
403 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
404 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
405 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
406 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
407 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
408 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
409 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
410 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
411 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
412 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
413 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
414 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
415 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
416 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
418 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
419 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
420 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
421 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
422 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
423 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
424 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
425 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
426 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
427 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
428 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
429 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
430 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
431 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
432 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
433 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
435 Version 1.62.1 (2022-07-19)
436 ==========================
438 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
439 library, and also mitigates a CPU vulnerability on Intel SGX.
441 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
442 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
443 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
444 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
445 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
447 [98608]: https://github.com/rust-lang/rust/issues/98608
448 [98890]: https://github.com/rust-lang/rust/issues/98890
449 [98950]: https://github.com/rust-lang/rust/pull/98950
450 [98126]: https://github.com/rust-lang/rust/pull/98126
451 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
453 Version 1.62.0 (2022-06-30)
454 ==========================
459 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
460 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
461 - [Fix constants not getting dropped if part of a diverging expression][94775]
462 - [Support unit struct/enum variant in destructuring assignment][95380]
463 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
464 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
469 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
470 - [Make `unaligned_references` lint deny-by-default][95372]
471 This lint is also a future compatibility lint, and is expected to eventually
473 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
474 - [Reject `#[thread_local]` attribute on non-static items][95006]
475 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
476 - [Implement a lint to warn about unused macro rules][96150]
477 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
479 \* Refer to Rust's [platform support page][platform-support-doc] for more
480 information on Rust's tiered platform support.
485 - [Windows: Use a pipe relay for chaining pipes][95841]
486 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
487 - [Replace RwLock by a futex based one on Linux][95801]
488 - [std: directly use pthread in UNIX parker implementation][96393]
493 - [`bool::then_some`]
497 - [`windows::CommandExt::raw_arg`]
498 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
499 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
500 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
501 - [`FusedIterator for EncodeWide`]
502 - [RDM intrinsics on aarch64][stdarch/1285]
507 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
512 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
514 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
515 - Package ID specs now support `name@version` syntax in addition to the
516 previous `name:version` to align with the behavior in `cargo add` and other
517 tools. `cargo install` and `cargo yank` also now support this syntax so the
518 version does not need to passed as a separate flag.
519 - The `git` and `registry` directories in Cargo's home directory (usually
520 `~/.cargo`) are now marked as cache directories so that they are not
521 included in backups or content indexing (on Windows).
522 - Added automatic `@` argfile support, which will use "response files" if the
523 command-line to `rustc` exceeds the operating system's limit.
528 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
529 the same as the host target.
530 [#10594](https://github.com/rust-lang/cargo/pull/10594)
531 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
532 - [rustdoc: Remove .woff font files][96279]
533 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
534 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
535 complete synchronously][95469].
540 - [Unify ReentrantMutex implementations across all platforms][96042]
542 These changes provide no direct user facing benefits, but represent significant
543 improvements to the internals and overall performance of rustc
546 [93313]: https://github.com/rust-lang/rust/pull/93313/
547 [93969]: https://github.com/rust-lang/rust/pull/93969/
548 [94206]: https://github.com/rust-lang/rust/pull/94206/
549 [94457]: https://github.com/rust-lang/rust/pull/94457/
550 [94775]: https://github.com/rust-lang/rust/pull/94775/
551 [94872]: https://github.com/rust-lang/rust/pull/94872/
552 [95006]: https://github.com/rust-lang/rust/pull/95006/
553 [95035]: https://github.com/rust-lang/rust/pull/95035/
554 [95346]: https://github.com/rust-lang/rust/pull/95346/
555 [95372]: https://github.com/rust-lang/rust/pull/95372/
556 [95380]: https://github.com/rust-lang/rust/pull/95380/
557 [95431]: https://github.com/rust-lang/rust/pull/95431/
558 [95469]: https://github.com/rust-lang/rust/pull/95469/
559 [95705]: https://github.com/rust-lang/rust/pull/95705/
560 [95801]: https://github.com/rust-lang/rust/pull/95801/
561 [95819]: https://github.com/rust-lang/rust/pull/95819/
562 [95841]: https://github.com/rust-lang/rust/pull/95841/
563 [96042]: https://github.com/rust-lang/rust/pull/96042/
564 [96150]: https://github.com/rust-lang/rust/pull/96150/
565 [96268]: https://github.com/rust-lang/rust/pull/96268/
566 [96279]: https://github.com/rust-lang/rust/pull/96279/
567 [96393]: https://github.com/rust-lang/rust/pull/96393/
568 [96436]: https://github.com/rust-lang/rust/pull/96436/
569 [96557]: https://github.com/rust-lang/rust/pull/96557/
570 [96630]: https://github.com/rust-lang/rust/pull/96630/
572 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
573 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
574 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
575 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
576 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
577 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
578 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
579 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
580 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
581 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
583 Version 1.61.0 (2022-05-19)
584 ==========================
589 - [`const fn` signatures can now include generic trait bounds][93827]
590 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
591 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
592 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
597 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
598 - [The `char` type is now described as UTF-32 in debuginfo][89887]
599 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
600 - X86 [`#[target_feature = "adx"]` is now stable][93745]
605 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
606 - [`#[ignore = "…"]` messages are printed when running tests][92714]
607 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
608 - [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.
609 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
610 - [`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.
615 - [`Pin::static_mut`]
616 - [`Pin::static_ref`]
617 - [`Vec::retain_mut`]
618 - [`VecDeque::retain_mut`]
619 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
620 - [`std::os::unix::net::SocketAddr::from_pathname`]
621 - [`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.
622 - [`std::thread::JoinHandle::is_finished`]
624 These APIs are now usable in const contexts:
626 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
627 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
628 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
629 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
630 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
631 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
632 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
633 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
634 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
639 No feature changes, but see compatibility notes.
644 - 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
645 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
646 - (less common) or be updated to use the [`+whole-archive`] modifier.
647 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
648 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
649 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
650 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
651 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
652 - [`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`.
653 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
658 These changes provide no direct user facing benefits, but represent significant
659 improvements to the internals and overall performance of rustc
662 - [debuginfo: Refactor debuginfo generation for types][94261]
663 - [Remove the everybody loops pass][93913]
665 [88375]: https://github.com/rust-lang/rust/pull/88375/
666 [89887]: https://github.com/rust-lang/rust/pull/89887/
667 [90621]: https://github.com/rust-lang/rust/pull/90621/
668 [92285]: https://github.com/rust-lang/rust/pull/92285/
669 [92472]: https://github.com/rust-lang/rust/pull/92472/
670 [92697]: https://github.com/rust-lang/rust/pull/92697/
671 [92714]: https://github.com/rust-lang/rust/pull/92714/
672 [92911]: https://github.com/rust-lang/rust/pull/92911/
673 [93263]: https://github.com/rust-lang/rust/pull/93263/
674 [93745]: https://github.com/rust-lang/rust/pull/93745/
675 [93827]: https://github.com/rust-lang/rust/pull/93827/
676 [93901]: https://github.com/rust-lang/rust/pull/93901/
677 [93913]: https://github.com/rust-lang/rust/pull/93913/
678 [93965]: https://github.com/rust-lang/rust/pull/93965/
679 [94081]: https://github.com/rust-lang/rust/pull/94081/
680 [94261]: https://github.com/rust-lang/rust/pull/94261/
681 [94295]: https://github.com/rust-lang/rust/pull/94295/
682 [94832]: https://github.com/rust-lang/rust/pull/94832/
683 [95016]: https://github.com/rust-lang/rust/pull/95016/
684 [95251]: https://github.com/rust-lang/rust/pull/95251/
685 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
686 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
687 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
688 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
689 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
690 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
691 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
692 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
693 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
694 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
695 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
696 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
697 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
698 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
699 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
700 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
701 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
702 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
703 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
704 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
705 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
706 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
709 Version 1.60.0 (2022-04-07)
710 ==========================
714 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
715 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
719 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
720 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
721 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
722 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
723 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
724 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
725 - [Fix invalid removal of newlines from doc comments][92357]
726 - [Add kernel target for RustyHermit][92670]
727 - [Deny mixing bin crate type with lib crate types][92933]
728 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
729 - [Upgrade to LLVM 14][93577]
731 \* Refer to Rust's [platform support page][platform-support-doc] for more
732 information on Rust's tiered platform support.
736 - [Guarantee call order for `sort_by_cached_key`][89621]
737 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
738 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
739 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
740 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
744 - [`Arc::new_cyclic`][arc_new_cyclic]
745 - [`Rc::new_cyclic`][rc_new_cyclic]
746 - [`slice::EscapeAscii`][slice_escape_ascii]
747 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
748 - [`u8::escape_ascii`][u8_escape_ascii]
749 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
750 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
751 - [`MaybeUninit::assume_init_read`][assume_init_read]
752 - [`i8::abs_diff`][i8_abs_diff]
753 - [`i16::abs_diff`][i16_abs_diff]
754 - [`i32::abs_diff`][i32_abs_diff]
755 - [`i64::abs_diff`][i64_abs_diff]
756 - [`i128::abs_diff`][i128_abs_diff]
757 - [`isize::abs_diff`][isize_abs_diff]
758 - [`u8::abs_diff`][u8_abs_diff]
759 - [`u16::abs_diff`][u16_abs_diff]
760 - [`u32::abs_diff`][u32_abs_diff]
761 - [`u64::abs_diff`][u64_abs_diff]
762 - [`u128::abs_diff`][u128_abs_diff]
763 - [`usize::abs_diff`][usize_abs_diff]
764 - [`Display for io::ErrorKind`][display_error_kind]
765 - [`From<u8> for ExitCode`][from_u8_exit_code]
766 - [`Not for !` (the "never" type)][not_never]
767 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
768 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
772 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
773 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
774 - [Stabilize namespaced and weak dependency features.][cargo/10269]
775 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
776 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
780 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
781 - [Drop rustc-docs from complete profile][93742]
782 - [bootstrap: tidy up flag handling for llvm build][93918]
786 - [Remove compiler-rt linking hack on Android][83822]
787 - [Mitigations for platforms with non-monotonic clocks have been removed from
788 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
789 instant is not guaranteed to be greater than an earlier instant anymore.
790 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
791 saturating to `0` instead][89926]. In the real world the panic happened mostly
792 on platforms with buggy monotonic clock implementations rather than catching
793 programming errors like reversing the start and end times. Such programming
794 errors will now results in `0` rather than a panic.
795 - In a future release we're planning to increase the baseline requirements for
796 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
797 your feedback in [PR #95026][95026].
802 These changes provide no direct user facing benefits, but represent significant
803 improvements to the internals and overall performance of rustc
806 - [Switch all libraries to the 2021 edition][92068]
808 [83822]: https://github.com/rust-lang/rust/pull/83822
809 [86374]: https://github.com/rust-lang/rust/pull/86374
810 [87487]: https://github.com/rust-lang/rust/pull/87487
811 [89621]: https://github.com/rust-lang/rust/pull/89621
812 [89926]: https://github.com/rust-lang/rust/pull/89926
813 [90132]: https://github.com/rust-lang/rust/pull/90132
814 [90247]: https://github.com/rust-lang/rust/pull/90247
815 [91606]: https://github.com/rust-lang/rust/pull/91606
816 [92068]: https://github.com/rust-lang/rust/pull/92068
817 [92300]: https://github.com/rust-lang/rust/pull/92300
818 [92357]: https://github.com/rust-lang/rust/pull/92357
819 [92383]: https://github.com/rust-lang/rust/pull/92383
820 [92630]: https://github.com/rust-lang/rust/pull/92630
821 [92670]: https://github.com/rust-lang/rust/pull/92670
822 [92800]: https://github.com/rust-lang/rust/pull/92800
823 [92933]: https://github.com/rust-lang/rust/pull/92933
824 [93566]: https://github.com/rust-lang/rust/pull/93566
825 [93577]: https://github.com/rust-lang/rust/pull/93577
826 [93658]: https://github.com/rust-lang/rust/pull/93658
827 [93742]: https://github.com/rust-lang/rust/pull/93742
828 [93824]: https://github.com/rust-lang/rust/pull/93824
829 [93918]: https://github.com/rust-lang/rust/pull/93918
830 [95026]: https://github.com/rust-lang/rust/pull/95026
832 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
833 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
834 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
835 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
836 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
838 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
839 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
840 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
841 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
842 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
843 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
844 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
845 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
846 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
847 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
848 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
849 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
850 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
851 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
852 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
853 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
854 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
855 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
856 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
857 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
858 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
859 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
860 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
861 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
862 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
864 Version 1.59.0 (2022-02-24)
865 ==========================
870 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
871 - [Stabilize destructuring assignment][90521]
872 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
873 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
878 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
879 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
880 - [Fix sparc64 ABI for aggregates with floating point members][91003]
881 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
882 - [Add support for riscv64gc-unknown-freebsd][91284]
883 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
884 - [Soft disable incremental compilation][94124]
886 This release disables incremental compilation, unless the user has explicitly
887 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
888 This is due to a known and relatively frequently occurring bug in incremental
889 compilation, which causes builds to issue internal compiler errors. This
890 particular bug is already fixed on nightly, but that fix has not yet rolled out
891 to stable and is deemed too risky for a direct stable backport.
893 As always, we encourage users to test with nightly and report bugs so that we
894 can track failures and fix issues earlier.
896 See [94124] for more details.
898 [94124]: https://github.com/rust-lang/rust/issues/94124
903 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
908 - [`std::thread::available_parallelism`][available_parallelism]
909 - [`Result::copied`][result-copied]
910 - [`Result::cloned`][result-cloned]
911 - [`arch::asm!`][asm]
912 - [`arch::global_asm!`][global_asm]
913 - [`ops::ControlFlow::is_break`][is_break]
914 - [`ops::ControlFlow::is_continue`][is_continue]
915 - [`TryFrom<char> for u8`][try_from_char_u8]
916 - [`char::TryFromCharError`][try_from_char_err]
917 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
919 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
920 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
921 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
922 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
923 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
924 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
925 - [`DoubleEndedIterator for ToLowercase`][lowercase]
926 - [`DoubleEndedIterator for ToUppercase`][uppercase]
927 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
928 - [`UnwindSafe for Once`][unwindsafe_once]
929 - [`RefUnwindSafe for Once`][refunwindsafe_once]
930 - [armv8 neon intrinsics for aarch64][stdarch/1266]
934 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
935 - [`mem::MaybeUninit::assume_init`][muninit_init]
936 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
937 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
942 - [Stabilize the `strip` profile option][cargo/10088]
943 - [Stabilize future-incompat-report][cargo/10165]
944 - [Support abbreviating `--release` as `-r`][cargo/10133]
945 - [Support `term.quiet` configuration][cargo/10152]
946 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
951 - [Refactor weak symbols in std::sys::unix][90846]
952 This may add new, versioned, symbols when building with a newer glibc, as the
953 standard library uses weak linkage rather than dynamically attempting to load
954 certain symbols at runtime.
955 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
956 This adds a future compatibility lint to supporting the use of cfg_attr
957 wrapping either crate_type or crate_name specification within Rust files;
958 it is recommended that users migrate to setting the equivalent command line
960 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
961 This may expose new names, leading to conflicts with preexisting names in a
962 given namespace and a compilation failure.
963 - [Cargo will document libraries before binaries.][cargo/10172]
964 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
965 - [Weaken guarantee around advancing underlying iterators in zip][83791]
966 - [Make split_inclusive() on an empty slice yield an empty output][89825]
967 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
968 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
973 These changes provide no direct user facing benefits, but represent significant
974 improvements to the internals and overall performance of rustc
977 - [Fix many cases of normalization-related ICEs][91255]
978 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
979 - [Store liveness in interval sets for region inference][90637]
981 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
982 unstable feature.][91867]
984 [91867]: https://github.com/rust-lang/rust/issues/91867
985 [83744]: https://github.com/rust-lang/rust/pull/83744/
986 [83791]: https://github.com/rust-lang/rust/pull/83791/
987 [85013]: https://github.com/rust-lang/rust/pull/85013/
988 [89825]: https://github.com/rust-lang/rust/pull/89825/
989 [89999]: https://github.com/rust-lang/rust/pull/89999/
990 [90128]: https://github.com/rust-lang/rust/pull/90128/
991 [90207]: https://github.com/rust-lang/rust/pull/90207/
992 [90521]: https://github.com/rust-lang/rust/pull/90521/
993 [90586]: https://github.com/rust-lang/rust/pull/90586/
994 [90637]: https://github.com/rust-lang/rust/pull/90637/
995 [90833]: https://github.com/rust-lang/rust/pull/90833/
996 [90846]: https://github.com/rust-lang/rust/pull/90846/
997 [91003]: https://github.com/rust-lang/rust/pull/91003/
998 [91172]: https://github.com/rust-lang/rust/pull/91172/
999 [91255]: https://github.com/rust-lang/rust/pull/91255/
1000 [91284]: https://github.com/rust-lang/rust/pull/91284/
1001 [91535]: https://github.com/rust-lang/rust/pull/91535/
1002 [91593]: https://github.com/rust-lang/rust/pull/91593/
1003 [91728]: https://github.com/rust-lang/rust/pull/91728/
1004 [91878]: https://github.com/rust-lang/rust/pull/91878/
1005 [91896]: https://github.com/rust-lang/rust/pull/91896/
1006 [91926]: https://github.com/rust-lang/rust/pull/91926/
1007 [91984]: https://github.com/rust-lang/rust/pull/91984/
1008 [92020]: https://github.com/rust-lang/rust/pull/92020/
1009 [92034]: https://github.com/rust-lang/rust/pull/92034/
1010 [92137]: https://github.com/rust-lang/rust/pull/92137/
1011 [92483]: https://github.com/rust-lang/rust/pull/92483/
1012 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
1013 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
1014 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
1015 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
1016 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
1017 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
1018 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
1019 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
1021 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
1022 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
1023 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
1024 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1025 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
1026 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
1027 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
1028 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
1029 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
1030 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
1031 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
1032 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
1033 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
1034 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
1035 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
1036 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
1037 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
1038 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
1039 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
1040 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
1041 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
1042 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
1043 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
1044 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
1045 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
1046 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
1048 Version 1.58.1 (2022-01-19)
1049 ===========================
1051 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
1052 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
1053 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
1054 * [Fix wrong error message displayed when some imports are missing][91254]
1055 * [Fix rustfmt not formatting generated files from stdin][92912]
1057 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
1058 [91254]: https://github.com/rust-lang/rust/pull/91254
1059 [92912]: https://github.com/rust-lang/rust/pull/92912
1060 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
1061 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
1063 Version 1.58.0 (2022-01-13)
1064 ==========================
1069 - [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.
1070 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
1071 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
1076 - [Add LLVM CFI support to the Rust compiler][89652]
1077 - [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.
1078 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
1079 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
1080 - [Update the minimum external LLVM to 12][90175]
1081 - [Add `x86_64-unknown-none` at Tier 3*][89062]
1082 - [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.
1083 - [Don't abort compilation after giving a lint error][87337]
1084 - [Error messages point at the source of trait bound obligations in more places][89580]
1086 \* Refer to Rust's [platform support page][platform-support-doc] for more
1087 information on Rust's tiered platform support.
1092 - [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.
1093 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
1094 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
1095 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
1096 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
1097 - [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).
1102 - [`Metadata::is_symlink`]
1103 - [`Path::is_symlink`]
1104 - [`{integer}::saturating_div`]
1105 - [`Option::unwrap_unchecked`]
1106 - [`Result::unwrap_unchecked`]
1107 - [`Result::unwrap_err_unchecked`]
1110 These APIs are now usable in const contexts:
1113 - [`Duration::checked_add`]
1114 - [`Duration::saturating_add`]
1115 - [`Duration::checked_sub`]
1116 - [`Duration::saturating_sub`]
1117 - [`Duration::checked_mul`]
1118 - [`Duration::saturating_mul`]
1119 - [`Duration::checked_div`]
1124 - [Add --message-format for install command][cargo/10107]
1125 - [Warn when alias shadows external subcommand][cargo/10082]
1130 - [Show all Deref implementations recursively in rustdoc][90183]
1131 - [Use computed visibility in rustdoc][88447]
1136 - [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.
1137 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1138 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1139 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1140 - [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.
1141 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1146 These changes provide no direct user facing benefits, but represent significant
1147 improvements to the internals and overall performance of rustc
1150 - [Implement coherence checks for negative trait impls][90104]
1151 - [Add rustc lint, warning when iterating over hashmaps][89558]
1152 - [Optimize live point computation][90491]
1153 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1154 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1156 [87337]: https://github.com/rust-lang/rust/pull/87337/
1157 [87467]: https://github.com/rust-lang/rust/pull/87467/
1158 [87704]: https://github.com/rust-lang/rust/pull/87704/
1159 [88041]: https://github.com/rust-lang/rust/pull/88041/
1160 [88447]: https://github.com/rust-lang/rust/pull/88447/
1161 [88601]: https://github.com/rust-lang/rust/pull/88601/
1162 [89062]: https://github.com/rust-lang/rust/pull/89062/
1163 [89174]: https://github.com/rust-lang/rust/pull/89174/
1164 [89551]: https://github.com/rust-lang/rust/pull/89551/
1165 [89558]: https://github.com/rust-lang/rust/pull/89558/
1166 [89580]: https://github.com/rust-lang/rust/pull/89580/
1167 [89652]: https://github.com/rust-lang/rust/pull/89652/
1168 [90041]: https://github.com/rust-lang/rust/pull/90041/
1169 [90058]: https://github.com/rust-lang/rust/pull/90058/
1170 [90104]: https://github.com/rust-lang/rust/pull/90104/
1171 [90117]: https://github.com/rust-lang/rust/pull/90117/
1172 [90175]: https://github.com/rust-lang/rust/pull/90175/
1173 [90183]: https://github.com/rust-lang/rust/pull/90183/
1174 [90297]: https://github.com/rust-lang/rust/pull/90297/
1175 [90329]: https://github.com/rust-lang/rust/pull/90329/
1176 [90361]: https://github.com/rust-lang/rust/pull/90361/
1177 [90417]: https://github.com/rust-lang/rust/pull/90417/
1178 [90473]: https://github.com/rust-lang/rust/pull/90473/
1179 [90491]: https://github.com/rust-lang/rust/pull/90491/
1180 [90733]: https://github.com/rust-lang/rust/pull/90733/
1181 [90833]: https://github.com/rust-lang/rust/pull/90833/
1182 [90846]: https://github.com/rust-lang/rust/pull/90846/
1183 [91026]: https://github.com/rust-lang/rust/pull/91026/
1184 [91207]: https://github.com/rust-lang/rust/pull/91207/
1185 [91255]: https://github.com/rust-lang/rust/pull/91255/
1186 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1187 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1188 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1189 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1190 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1191 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1192 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1193 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1194 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1195 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1197 Version 1.57.0 (2021-12-02)
1198 ==========================
1203 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1204 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1205 - [Allow panicking in constant evaluation.][89508]
1206 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1211 - [Create more accurate debuginfo for vtables.][89597]
1212 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1213 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1214 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1215 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1217 \* Refer to Rust's [platform support page][platform-support-doc] for more
1218 information on Rust's tiered platform support.
1223 - [Avoid allocations and copying in `Vec::leak`][89337]
1224 - [Add `#[repr(i8)]` to `Ordering`][89507]
1225 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1226 - [Update to Unicode 14.0][89614]
1227 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1228 when ignoring their return value. This helps catch mistakes such as expecting
1229 a function to mutate a value in place rather than return a new value.
1234 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1235 - [`[T; N]::as_slice`][`array::as_slice`]
1236 - [`collections::TryReserveError`]
1237 - [`HashMap::try_reserve`]
1238 - [`HashSet::try_reserve`]
1239 - [`String::try_reserve`]
1240 - [`String::try_reserve_exact`]
1241 - [`Vec::try_reserve`]
1242 - [`Vec::try_reserve_exact`]
1243 - [`VecDeque::try_reserve`]
1244 - [`VecDeque::try_reserve_exact`]
1245 - [`Iterator::map_while`]
1246 - [`iter::MapWhile`]
1247 - [`proc_macro::is_available`]
1248 - [`Command::get_program`]
1249 - [`Command::get_args`]
1250 - [`Command::get_envs`]
1251 - [`Command::get_current_dir`]
1255 These APIs are now usable in const contexts:
1257 - [`hint::unreachable_unchecked`]
1262 - [Stabilize custom profiles][cargo/9943]
1267 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1268 This will break some builds that set `#![deny(dead_code)]`.
1272 These changes provide no direct user facing benefits, but represent significant
1273 improvements to the internals and overall performance of rustc
1276 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1278 [85200]: https://github.com/rust-lang/rust/pull/85200/
1279 [86191]: https://github.com/rust-lang/rust/pull/86191/
1280 [87220]: https://github.com/rust-lang/rust/pull/87220/
1281 [87260]: https://github.com/rust-lang/rust/pull/87260/
1282 [88321]: https://github.com/rust-lang/rust/pull/88321/
1283 [88529]: https://github.com/rust-lang/rust/pull/88529/
1284 [88690]: https://github.com/rust-lang/rust/pull/88690/
1285 [88952]: https://github.com/rust-lang/rust/pull/88952/
1286 [89337]: https://github.com/rust-lang/rust/pull/89337/
1287 [89507]: https://github.com/rust-lang/rust/pull/89507/
1288 [89508]: https://github.com/rust-lang/rust/pull/89508/
1289 [89582]: https://github.com/rust-lang/rust/pull/89582/
1290 [89597]: https://github.com/rust-lang/rust/pull/89597/
1291 [89614]: https://github.com/rust-lang/rust/pull/89614/
1292 [89692]: https://github.com/rust-lang/rust/issues/89692/
1293 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1294 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1295 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1296 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1297 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1298 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1299 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1300 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1301 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1302 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1303 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1304 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1305 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1306 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1307 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1308 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1309 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1310 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1311 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1312 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1313 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1315 Version 1.56.1 (2021-11-01)
1316 ===========================
1318 - New lints to detect the presence of bidirectional-override Unicode
1319 codepoints in the compiled source code ([CVE-2021-42574])
1321 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1323 Version 1.56.0 (2021-10-21)
1324 ========================
1329 - [The 2021 Edition is now stable.][rust#88100]
1330 See [the edition guide][rust-2021-edition-guide] for more details.
1331 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1332 - [Union field access is permitted in `const fn`.][rust#85769]
1334 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1339 - [Upgrade to LLVM 13.][rust#87570]
1340 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1341 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1342 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1343 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1344 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1345 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1346 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1348 \* Refer to Rust's [platform support page][platform-support-doc] for more
1349 information on Rust's tiered platform support.
1354 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1355 The Windows console still requires valid Unicode, but this change allows
1356 splitting a UTF-8 character across multiple write calls. This allows, for
1357 instance, programs that just read and write data buffers (e.g. copying a file
1358 to stdout) without regard for Unicode or character boundaries.
1359 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1360 For this use case, atomics scale much better under contention.
1361 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1362 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1363 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1364 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1365 - [Treat invalid environment variable names as non-existent.][rust#86183]
1366 Previously, the environment functions would panic if given a variable name
1367 with an internal null character or equal sign (`=`). Now, these functions will
1368 just treat such names as non-existent variables, since the OS cannot represent
1369 the existence of a variable with such a name.
1374 - [`std::os::unix::fs::chroot`]
1375 - [`UnsafeCell::raw_get`]
1376 - [`BufWriter::into_parts`]
1377 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1378 These APIs were previously stable in `std`, but are now also available in `core`.
1379 - [`Vec::shrink_to`]
1380 - [`String::shrink_to`]
1381 - [`OsString::shrink_to`]
1382 - [`PathBuf::shrink_to`]
1383 - [`BinaryHeap::shrink_to`]
1384 - [`VecDeque::shrink_to`]
1385 - [`HashMap::shrink_to`]
1386 - [`HashSet::shrink_to`]
1388 These APIs are now usable in const contexts:
1390 - [`std::mem::transmute`]
1391 - [`[T]::first`][`slice::first`]
1392 - [`[T]::split_first`][`slice::split_first`]
1393 - [`[T]::last`][`slice::last`]
1394 - [`[T]::split_last`][`slice::split_last`]
1399 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1400 This has no effect at present on dependency version selection.
1401 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1402 that support Rust code to include a crate's specified minimum version in the test matrix for that
1408 - [Update to new argument parsing rules on Windows.][rust#87580]
1409 This adjusts Rust's standard library to match the behavior of the standard
1410 libraries for C/C++. The rules have changed slightly over time, and this PR
1411 brings us to the latest set of rules (changed in 2008).
1412 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1413 This was already not supported by LLVM; this change surfaces this lack of
1414 support with a better error message.
1415 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1416 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1417 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1418 may return different values on glibc <= 2.24.][rust#81825]
1419 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1420 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1421 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1422 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1426 These changes provide no direct user facing benefits, but represent significant
1427 improvements to the internals and overall performance of rustc
1430 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1431 This improves the performance of most Rust builds.
1432 - [Unify representation of macros in internal data structures.][rust#88019]
1433 This change fixes a host of bugs with the handling of macros by the compiler,
1436 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1437 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1438 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1439 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1440 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1441 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1442 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1443 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1444 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1445 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1446 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1447 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1448 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1449 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1450 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1451 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1452 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1453 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1454 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1455 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1456 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1457 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1458 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1459 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1460 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1461 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1462 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1463 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1464 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1465 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1466 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1467 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1468 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1469 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1470 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1471 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1472 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1473 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1474 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1475 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1476 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1477 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1479 Version 1.55.0 (2021-09-09)
1480 ============================
1484 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1485 will end at the maximum value of the integer.][83918]
1486 - [You can now explicitly import the prelude of different editions
1487 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1491 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1493 \* Refer to Rust's [platform support page][platform-support-doc] for more
1494 information on Rust's tiered platform support.
1499 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1500 These improvements should in general provide faster string parsing of floats,
1501 no longer reject certain valid floating point values, and reduce
1502 the produced code size for non-stripped artifacts.
1503 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1510 - [`IntoInnerError::into_error`]
1511 - [`IntoInnerError::into_parts`]
1512 - [`MaybeUninit::assume_init_mut`]
1513 - [`MaybeUninit::assume_init_ref`]
1514 - [`MaybeUninit::write`]
1516 - [`ops::ControlFlow`]
1518 - [`x86::_bittestandcomplement`]
1519 - [`x86::_bittestandreset`]
1520 - [`x86::_bittestandset`]
1521 - [`x86_64::_bittest64`]
1522 - [`x86_64::_bittestandcomplement64`]
1523 - [`x86_64::_bittestandreset64`]
1524 - [`x86_64::_bittestandset64`]
1526 The following previously stable functions are now `const`.
1528 - [`str::from_utf8_unchecked`]
1533 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1534 rustc in parallel such as when using `cargo test`.][cargo/9675]
1535 - [The package definition in `cargo metadata` now includes the `"default_run"`
1536 field from the manifest.][cargo/9550]
1537 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1538 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1539 of packages.][cargo/9663]
1543 - [Added "Go to item on exact match" search option.][85876]
1544 - [The "Implementors" section on traits no longer shows redundant
1545 method definitions.][85970]
1546 - [Trait implementations are toggled open by default.][86260] This should make the
1547 implementations more searchable by tools like `CTRL+F` in your browser.
1548 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1549 through type aliases.][86334]
1550 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1551 "Trait Implementations" section.][86513]
1556 - [std functions that return an `io::Error` will no longer use the
1557 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1558 kinds of errors could be categorised [into newer more specific `ErrorKind`
1559 variants][79965], and that they do not represent a user error.
1560 - [Using environment variable names with `process::Command` on Windows now
1561 behaves as expected.][85270] Previously using envionment variables with
1562 `Command` would cause them to be ASCII-uppercased.
1563 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1564 with `rustdoc::`][86849]
1565 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1566 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1567 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1570 [86849]: https://github.com/rust-lang/rust/pull/86849
1571 [86513]: https://github.com/rust-lang/rust/pull/86513
1572 [86334]: https://github.com/rust-lang/rust/pull/86334
1573 [86260]: https://github.com/rust-lang/rust/pull/86260
1574 [85970]: https://github.com/rust-lang/rust/pull/85970
1575 [85876]: https://github.com/rust-lang/rust/pull/85876
1576 [83572]: https://github.com/rust-lang/rust/pull/83572
1577 [86294]: https://github.com/rust-lang/rust/pull/86294
1578 [86858]: https://github.com/rust-lang/rust/pull/86858
1579 [86761]: https://github.com/rust-lang/rust/pull/86761
1580 [85746]: https://github.com/rust-lang/rust/pull/85746
1581 [85270]: https://github.com/rust-lang/rust/pull/85270
1582 [83918]: https://github.com/rust-lang/rust/pull/83918
1583 [79965]: https://github.com/rust-lang/rust/pull/79965
1584 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1585 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1586 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1587 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1588 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1589 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1590 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1591 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1592 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1593 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1594 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1595 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1596 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1597 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1598 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1599 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1600 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1601 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1602 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1603 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1604 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1605 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1608 Version 1.54.0 (2021-07-29)
1609 ============================
1612 -----------------------
1614 - [You can now use macros for values in some built-in attributes.][83366]
1615 This primarily allows you to call macros within the `#[doc]` attribute. For
1616 example, to include external documentation in your crate, you can now write
1619 #![doc = include_str!("README.md")]
1622 - [You can now cast between unsized slice types (and types which contain
1623 unsized slices) in `const fn`.][85078]
1624 - [You can now use multiple generic lifetimes with `impl Trait` where the
1625 lifetimes don't explicitly outlive another.][84701] In code this means
1626 that you can now have `impl Trait<'a, 'b>` where as before you could
1627 only have `impl Trait<'a, 'b> where 'b: 'a`.
1630 -----------------------
1632 - [Rustc will now search for custom JSON targets in
1633 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1634 directory.][83800] You can find your sysroot directory by running
1635 `rustc --print sysroot`.
1636 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1637 - [You can now use `#[target_feature]` on safe functions when targeting
1638 WebAssembly platforms.][84988]
1639 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1640 - [Added tier 3\* support for `bpfel-unknown-none`
1641 and `bpfeb-unknown-none`.][79608]
1642 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1644 \* Refer to Rust's [platform support page][platform-support-doc] for more
1645 information on Rust's tiered platform support.
1648 -----------------------
1650 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1651 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1652 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1653 - [The implementations of vendor intrinsics in core::arch have been
1654 significantly refactored.][83278] The main user-visible changes are
1655 a 50% reduction in the size of libcore.rlib and stricter validation
1656 of constant operands passed to intrinsics. The latter is technically
1657 a breaking change, but allows Rust to more closely match the C vendor
1663 - [`BTreeMap::into_keys`]
1664 - [`BTreeMap::into_values`]
1665 - [`HashMap::into_keys`]
1666 - [`HashMap::into_values`]
1668 - [`VecDeque::binary_search`]
1669 - [`VecDeque::binary_search_by`]
1670 - [`VecDeque::binary_search_by_key`]
1671 - [`VecDeque::partition_point`]
1676 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1677 the dependency graph.][cargo/9520]
1678 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1679 in the tree ][cargo/9499]
1680 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1681 macro dependencies.][cargo/9488]
1682 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1683 This variable points to a directory that integration tests and benches
1684 can use as a "scratchpad" for testing filesystem operations.
1688 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1689 - [Previously unsound code is no longer permitted where different constructors in branches
1690 could require different lifetimes.][85574]
1691 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1692 than before and may reject some previously accepted code.
1693 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1694 when compiled with `codegen-units = 1`.][86063]
1696 [85574]: https://github.com/rust-lang/rust/issues/85574
1697 [86831]: https://github.com/rust-lang/rust/issues/86831
1698 [86063]: https://github.com/rust-lang/rust/issues/86063
1699 [79608]: https://github.com/rust-lang/rust/pull/79608
1700 [84988]: https://github.com/rust-lang/rust/pull/84988
1701 [84701]: https://github.com/rust-lang/rust/pull/84701
1702 [84072]: https://github.com/rust-lang/rust/pull/84072
1703 [85745]: https://github.com/rust-lang/rust/pull/85745
1704 [84744]: https://github.com/rust-lang/rust/pull/84744
1705 [85078]: https://github.com/rust-lang/rust/pull/85078
1706 [84717]: https://github.com/rust-lang/rust/pull/84717
1707 [83800]: https://github.com/rust-lang/rust/pull/83800
1708 [83366]: https://github.com/rust-lang/rust/pull/83366
1709 [83278]: https://github.com/rust-lang/rust/pull/83278
1710 [85292]: https://github.com/rust-lang/rust/pull/85292
1711 [82834]: https://github.com/rust-lang/rust/pull/82834
1712 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1713 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1714 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1715 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1716 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1717 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1718 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1719 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1720 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1721 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1722 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1724 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1726 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1728 Version 1.53.0 (2021-06-17)
1729 ============================
1732 -----------------------
1733 - [You can now use unicode for identifiers.][83799] This allows multilingual
1734 identifiers but still doesn't allow glyphs that are not considered characters
1735 such as `◆` or `🦀`. More specifically you can now use any identifier that
1736 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1737 is the same standard as languages like Python, however Rust uses NFC
1738 normalization which may be different from other languages.
1739 - [You can now specify "or patterns" inside pattern matches.][79278]
1740 Previously you could only use `|` (OR) on complete patterns. E.g.
1744 matches!(x, Some(1) | Some(2));
1746 matches!(x, Some(1 | 2));
1748 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1749 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1750 to change semantics to being a pattern fragment in a future edition.
1753 -----------------------
1754 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1755 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1756 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1758 \* Refer to Rust's [platform support page][platform-support-doc] for more
1759 information on Rust's tiered platform support.
1762 -----------------------
1763 - [Abort messages will now forward to `android_set_abort_message` on
1764 Android platforms when available.][81469]
1765 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1766 - [Arrays of any length now implement `IntoIterator`.][84147]
1767 Currently calling `.into_iter()` as a method on an array will
1768 return `impl Iterator<Item=&T>`, but this may change in a
1769 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1770 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1771 - [`leading_zeros`, and `trailing_zeros` are now available on all
1772 `NonZero` integer types.][84082]
1773 - [`{f32, f64}::from_str` now parse and print special values
1774 (`NaN`, `-0`) according to IEEE 754.][78618]
1775 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1776 - [Add the `BITS` associated constant to all numeric types.][82565]
1780 - [`AtomicBool::fetch_update`]
1781 - [`AtomicPtr::fetch_update`]
1782 - [`BTreeMap::retain`]
1783 - [`BTreeSet::retain`]
1784 - [`BufReader::seek_relative`]
1785 - [`DebugStruct::non_exhaustive`]
1787 - [`Duration::ZERO`]
1788 - [`Duration::is_zero`]
1789 - [`Duration::saturating_add`]
1790 - [`Duration::saturating_mul`]
1791 - [`Duration::saturating_sub`]
1792 - [`ErrorKind::Unsupported`]
1793 - [`Option::insert`]
1794 - [`Ordering::is_eq`]
1795 - [`Ordering::is_ge`]
1796 - [`Ordering::is_gt`]
1797 - [`Ordering::is_le`]
1798 - [`Ordering::is_lt`]
1799 - [`Ordering::is_ne`]
1800 - [`OsStr::is_ascii`]
1801 - [`OsStr::make_ascii_lowercase`]
1802 - [`OsStr::make_ascii_uppercase`]
1803 - [`OsStr::to_ascii_lowercase`]
1804 - [`OsStr::to_ascii_uppercase`]
1805 - [`Peekable::peek_mut`]
1806 - [`Rc::decrement_strong_count`]
1807 - [`Rc::increment_strong_count`]
1808 - [`Vec::extend_from_within`]
1809 - [`array::from_mut`]
1810 - [`array::from_ref`]
1811 - [`cmp::max_by_key`]
1813 - [`cmp::min_by_key`]
1815 - [`f32::is_subnormal`]
1816 - [`f64::is_subnormal`]
1819 -----------------------
1820 - [Cargo now supports git repositories where the default `HEAD` branch is not
1821 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1822 which can handle default branches correctly.
1823 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1824 - [The `authors` field is no longer included in `Cargo.toml` for new
1825 projects.][cargo/9282]
1828 -----------------------
1829 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1830 without hyperlinks.][81764]
1834 - [Implement token-based handling of attributes during expansion][82608]
1835 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1836 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1837 to confusion and potential security vulnerabilities and [is no
1838 longer recommended][ietf6943].
1839 - [The added `BITS` constant may conflict with external definitions.][85667]
1840 In particular, this was known to be a problem in the `lexical-core` crate,
1841 but they have published fixes for semantic versions 0.4 through 0.7. To
1842 update this dependency alone, use `cargo update -p lexical-core`.
1843 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1847 These changes provide no direct user facing benefits, but represent significant
1848 improvements to the internals and overall performance of rustc and
1851 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1852 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1853 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1854 - [Rework rustdoc const type][82873]
1856 [85667]: https://github.com/rust-lang/rust/pull/85667
1857 [83386]: https://github.com/rust-lang/rust/pull/83386
1858 [82771]: https://github.com/rust-lang/rust/pull/82771
1859 [84147]: https://github.com/rust-lang/rust/pull/84147
1860 [84082]: https://github.com/rust-lang/rust/pull/84082
1861 [83799]: https://github.com/rust-lang/rust/pull/83799
1862 [83681]: https://github.com/rust-lang/rust/pull/83681
1863 [83652]: https://github.com/rust-lang/rust/pull/83652
1864 [83387]: https://github.com/rust-lang/rust/pull/83387
1865 [82873]: https://github.com/rust-lang/rust/pull/82873
1866 [82864]: https://github.com/rust-lang/rust/pull/82864
1867 [82608]: https://github.com/rust-lang/rust/pull/82608
1868 [82565]: https://github.com/rust-lang/rust/pull/82565
1869 [80525]: https://github.com/rust-lang/rust/pull/80525
1870 [79278]: https://github.com/rust-lang/rust/pull/79278
1871 [78618]: https://github.com/rust-lang/rust/pull/78618
1872 [77704]: https://github.com/rust-lang/rust/pull/77704
1873 [83941]: https://github.com/rust-lang/rust/pull/83941
1874 [83065]: https://github.com/rust-lang/rust/pull/83065
1875 [81764]: https://github.com/rust-lang/rust/pull/81764
1876 [81469]: https://github.com/rust-lang/rust/pull/81469
1877 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1878 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1879 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1880 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1881 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1882 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1883 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1884 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1885 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1886 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1887 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1888 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1889 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1890 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1891 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1892 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1893 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1894 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1895 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1896 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1897 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1898 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1899 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1900 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1901 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1902 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1903 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1904 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1905 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1906 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1907 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1908 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1909 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1910 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1911 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1912 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1913 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1914 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1915 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1916 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1917 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1920 Version 1.52.1 (2021-05-10)
1921 ============================
1923 This release disables incremental compilation, unless the user has explicitly
1924 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1926 This is due to the widespread, and frequently occurring, breakage encountered by
1927 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1928 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1929 newly added incremental verification are still present in past stable versions,
1930 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1933 These problems only affect incremental builds, so release builds with Cargo
1934 should not be affected unless the user has explicitly opted into incremental.
1935 Debug and check builds are affected.
1937 See [84970] for more details.
1939 [84970]: https://github.com/rust-lang/rust/issues/84970
1941 Version 1.52.0 (2021-05-06)
1942 ============================
1946 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1947 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1948 is allowed by default, and may become a warning or hard error in a
1950 - [You can now cast mutable references to arrays to a pointer of the same type as
1951 the element.][81479]
1955 - [Upgraded the default LLVM to LLVM 12.][81451]
1957 Added tier 3\* support for the following targets.
1959 - [`s390x-unknown-linux-musl`][82166]
1960 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1961 - [`powerpc-unknown-openbsd`][82733]
1963 \* Refer to Rust's [platform support page][platform-support-doc] for more
1964 information on Rust's tiered platform support.
1968 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1969 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1970 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1971 - [All integer division and remainder operations are now `const`.][80962]
1975 - [`Arguments::as_str`]
1977 - [`char::REPLACEMENT_CHARACTER`]
1978 - [`char::UNICODE_VERSION`]
1979 - [`char::decode_utf16`]
1980 - [`char::from_digit`]
1981 - [`char::from_u32_unchecked`]
1982 - [`char::from_u32`]
1983 - [`slice::partition_point`]
1984 - [`str::rsplit_once`]
1985 - [`str::split_once`]
1987 The following previously stable APIs are now `const`.
1989 - [`char::len_utf8`]
1990 - [`char::len_utf16`]
1991 - [`char::to_ascii_uppercase`]
1992 - [`char::to_ascii_lowercase`]
1993 - [`char::eq_ignore_ascii_case`]
1994 - [`u8::to_ascii_uppercase`]
1995 - [`u8::to_ascii_lowercase`]
1996 - [`u8::eq_ignore_ascii_case`]
2000 - [Rustdoc lints are now treated as a tool lint, meaning that
2001 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
2002 Using the old style is still allowed, and will become a warning in
2004 - [Rustdoc now supports argument files.][82261]
2005 - [Rustdoc now generates smart punctuation for documentation.][79423]
2006 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
2014 - [You can now pass multiple filters to tests.][81356] E.g.
2015 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
2016 - [Rustup now distributes PDB symbols for the `std` library on Windows,
2017 allowing you to see `std` symbols when debugging.][82218]
2021 These changes provide no direct user facing benefits, but represent significant
2022 improvements to the internals and overall performance of rustc and
2025 - [Check the result cache before the DepGraph when ensuring queries][81855]
2026 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
2027 - [Only store a LocalDefId in some HIR nodes][81611]
2028 - [Store HIR attributes in a side table][79519]
2032 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
2033 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
2034 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
2035 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
2036 languages in code blocks.][78429]
2037 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
2038 - [Changes in how proc macros handle whitespace may lead to panics when used
2039 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
2040 - [Turn `#[derive]` into a regular macro attribute][79078]
2042 [84136]: https://github.com/rust-lang/rust/issues/84136
2043 [80763]: https://github.com/rust-lang/rust/pull/80763
2044 [82166]: https://github.com/rust-lang/rust/pull/82166
2045 [82121]: https://github.com/rust-lang/rust/pull/82121
2046 [81879]: https://github.com/rust-lang/rust/pull/81879
2047 [82261]: https://github.com/rust-lang/rust/pull/82261
2048 [82218]: https://github.com/rust-lang/rust/pull/82218
2049 [82216]: https://github.com/rust-lang/rust/pull/82216
2050 [82202]: https://github.com/rust-lang/rust/pull/82202
2051 [81855]: https://github.com/rust-lang/rust/pull/81855
2052 [81766]: https://github.com/rust-lang/rust/pull/81766
2053 [81744]: https://github.com/rust-lang/rust/pull/81744
2054 [81611]: https://github.com/rust-lang/rust/pull/81611
2055 [81479]: https://github.com/rust-lang/rust/pull/81479
2056 [81451]: https://github.com/rust-lang/rust/pull/81451
2057 [81356]: https://github.com/rust-lang/rust/pull/81356
2058 [80962]: https://github.com/rust-lang/rust/pull/80962
2059 [80553]: https://github.com/rust-lang/rust/pull/80553
2060 [80527]: https://github.com/rust-lang/rust/pull/80527
2061 [79519]: https://github.com/rust-lang/rust/pull/79519
2062 [79423]: https://github.com/rust-lang/rust/pull/79423
2063 [79208]: https://github.com/rust-lang/rust/pull/79208
2064 [78429]: https://github.com/rust-lang/rust/pull/78429
2065 [82733]: https://github.com/rust-lang/rust/pull/82733
2066 [82594]: https://github.com/rust-lang/rust/pull/82594
2067 [79078]: https://github.com/rust-lang/rust/pull/79078
2068 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
2069 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
2070 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
2071 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
2072 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
2073 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
2074 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
2075 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
2076 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
2077 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
2078 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
2079 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
2080 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
2081 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
2082 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
2083 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
2084 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
2085 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
2086 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
2087 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
2088 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
2089 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
2091 Version 1.51.0 (2021-03-25)
2092 ============================
2096 - [You can now parameterize items such as functions, traits, and `struct`s by constant
2097 values in addition to by types and lifetimes.][79135] Also known as "const generics"
2098 E.g. you can now write the following. Note: Only values of primitive integers,
2099 `bool`, or `char` types are currently permitted.
2101 struct GenericArray<T, const LENGTH: usize> {
2105 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2106 const fn last(&self) -> Option<&T> {
2110 Some(&self.inner[LENGTH - 1])
2120 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2121 This option controls whether debug information is split across multiple files
2122 or packed into a single file. **Note** This option is unstable on other platforms.
2123 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2124 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2125 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2126 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2128 \* Refer to Rust's [platform support page][platform-support-doc] for more
2129 information on Rust's tiered platform support.
2134 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2135 - [`str` now implements `AsMut<str>`.][80279]
2136 - [`u64` and `u128` now implement `From<char>`.][79502]
2137 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2138 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2139 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2140 - [`io::Empty` now implements `io::Seek`.][78044]
2141 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2142 `T: ?Sized` types.][80764]
2143 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2149 - [`Arc::decrement_strong_count`]
2150 - [`Arc::increment_strong_count`]
2151 - [`Once::call_once_force`]
2152 - [`Peekable::next_if_eq`]
2153 - [`Peekable::next_if`]
2154 - [`Seek::stream_position`]
2155 - [`array::IntoIter`]
2156 - [`panic::panic_any`]
2158 - [`ptr::addr_of_mut!`]
2159 - [`slice::fill_with`]
2160 - [`slice::split_inclusive_mut`]
2161 - [`slice::split_inclusive`]
2162 - [`slice::strip_prefix`]
2163 - [`slice::strip_suffix`]
2164 - [`str::split_inclusive`]
2165 - [`sync::OnceState`]
2167 - [`VecDeque::range`]
2168 - [`VecDeque::range_mut`]
2172 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2173 codegen option.][cargo/9112]
2174 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2175 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2176 to avoid unifying features of dependencies where that unification could be unwanted.
2177 Such as using the same dependency with a `std` feature in a build scripts and
2178 proc-macros, while using the `no-std` feature in the final binary. See the
2179 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2184 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2185 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2186 documentation.][79642]
2188 Various improvements to intra-doc links:
2190 - [You can link to non-path primitives such as `slice`.][80181]
2191 - [You can link to associated items.][74489]
2192 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2196 - [You can now pass `--include-ignored` to tests (e.g. with
2197 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2202 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2203 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2205 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2206 for the distributed artifacts.][81521]
2207 - `armv5te-unknown-linux-gnueabi`
2208 - `sparc64-unknown-linux-gnu`
2209 - `thumbv7neon-unknown-linux-gnueabihf`
2210 - `armv7-unknown-linux-gnueabi`
2211 - `x86_64-unknown-linux-gnux32`
2212 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2217 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2219 [79135]: https://github.com/rust-lang/rust/pull/79135
2220 [74489]: https://github.com/rust-lang/rust/pull/74489
2221 [76934]: https://github.com/rust-lang/rust/pull/76934
2222 [79570]: https://github.com/rust-lang/rust/pull/79570
2223 [80181]: https://github.com/rust-lang/rust/pull/80181
2224 [79642]: https://github.com/rust-lang/rust/pull/79642
2225 [80945]: https://github.com/rust-lang/rust/pull/80945
2226 [80279]: https://github.com/rust-lang/rust/pull/80279
2227 [80053]: https://github.com/rust-lang/rust/pull/80053
2228 [79502]: https://github.com/rust-lang/rust/pull/79502
2229 [75180]: https://github.com/rust-lang/rust/pull/75180
2230 [81521]: https://github.com/rust-lang/rust/pull/81521
2231 [80968]: https://github.com/rust-lang/rust/pull/80968
2232 [80959]: https://github.com/rust-lang/rust/pull/80959
2233 [80718]: https://github.com/rust-lang/rust/pull/80718
2234 [80653]: https://github.com/rust-lang/rust/pull/80653
2235 [80579]: https://github.com/rust-lang/rust/pull/80579
2236 [79998]: https://github.com/rust-lang/rust/pull/79998
2237 [78044]: https://github.com/rust-lang/rust/pull/78044
2238 [81455]: https://github.com/rust-lang/rust/pull/81455
2239 [80764]: https://github.com/rust-lang/rust/pull/80764
2240 [80749]: https://github.com/rust-lang/rust/pull/80749
2241 [80662]: https://github.com/rust-lang/rust/pull/80662
2242 [79134]: https://github.com/rust-lang/rust/pull/79134
2243 [80966]: https://github.com/rust-lang/rust/pull/80966
2244 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2245 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2246 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2247 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2248 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2249 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2250 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2251 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2252 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2253 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2254 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2255 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2256 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2257 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2258 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2259 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2260 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2261 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2262 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2263 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2264 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2265 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2266 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2268 Version 1.50.0 (2021-02-11)
2269 ============================
2272 -----------------------
2273 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2274 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2275 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2278 -----------------------
2279 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2280 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2281 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2282 - [Dropped support for all cloudabi targets.][78439]
2284 \* Refer to Rust's [platform support page][platform-support-doc] for more
2285 information on Rust's tiered platform support.
2288 -----------------------
2290 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2291 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2292 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2293 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2294 up the same amount of space as `File`.
2300 - [`btree_map::Entry::or_insert_with_key`]
2303 - [`hash_map::Entry::or_insert_with_key`]
2307 - [`UnsafeCell::get_mut`]
2309 The following previously stable methods are now `const`.
2311 - [`IpAddr::is_ipv4`]
2312 - [`IpAddr::is_ipv6`]
2313 - [`IpAddr::is_unspecified`]
2314 - [`IpAddr::is_loopback`]
2315 - [`IpAddr::is_multicast`]
2316 - [`Ipv4Addr::octets`]
2317 - [`Ipv4Addr::is_loopback`]
2318 - [`Ipv4Addr::is_private`]
2319 - [`Ipv4Addr::is_link_local`]
2320 - [`Ipv4Addr::is_multicast`]
2321 - [`Ipv4Addr::is_broadcast`]
2322 - [`Ipv4Addr::is_documentation`]
2323 - [`Ipv4Addr::to_ipv6_compatible`]
2324 - [`Ipv4Addr::to_ipv6_mapped`]
2325 - [`Ipv6Addr::segments`]
2326 - [`Ipv6Addr::is_unspecified`]
2327 - [`Ipv6Addr::is_loopback`]
2328 - [`Ipv6Addr::is_multicast`]
2329 - [`Ipv6Addr::to_ipv4`]
2332 - [`Layout::from_size_align`]
2333 - `pow` for all integer types.
2334 - `checked_pow` for all integer types.
2335 - `saturating_pow` for all integer types.
2336 - `wrapping_pow` for all integer types.
2337 - `next_power_of_two` for all unsigned integer types.
2338 - `checked_next_power_of_two` for all unsigned integer types.
2341 -----------------------
2343 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2344 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2345 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2346 contents of that directory for changes.][cargo/8973]
2347 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2352 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2353 - [Running tests will now print the total time taken to execute.][75752]
2358 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2359 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2360 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2361 unhygenic `macro_rules!` macros.][79472]
2362 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2363 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2364 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2365 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2366 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2367 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2369 [74989]: https://github.com/rust-lang/rust/pull/74989
2370 [79261]: https://github.com/rust-lang/rust/pull/79261
2371 [79896]: https://github.com/rust-lang/rust/pull/79896
2372 [79484]: https://github.com/rust-lang/rust/pull/79484
2373 [79472]: https://github.com/rust-lang/rust/pull/79472
2374 [79270]: https://github.com/rust-lang/rust/pull/79270
2375 [79003]: https://github.com/rust-lang/rust/pull/79003
2376 [78864]: https://github.com/rust-lang/rust/pull/78864
2377 [78636]: https://github.com/rust-lang/rust/pull/78636
2378 [78439]: https://github.com/rust-lang/rust/pull/78439
2379 [78343]: https://github.com/rust-lang/rust/pull/78343
2380 [78296]: https://github.com/rust-lang/rust/pull/78296
2381 [78068]: https://github.com/rust-lang/rust/pull/78068
2382 [75752]: https://github.com/rust-lang/rust/pull/75752
2383 [74699]: https://github.com/rust-lang/rust/pull/74699
2384 [78142]: https://github.com/rust-lang/rust/pull/78142
2385 [77484]: https://github.com/rust-lang/rust/pull/77484
2386 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2387 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2388 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2389 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2390 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2391 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2392 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2393 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2394 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2395 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2396 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2397 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2398 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2399 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2400 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2401 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2402 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2403 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2404 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2405 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2406 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2407 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2408 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2409 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2410 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2411 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2412 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2413 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2414 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2415 [`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
2416 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2417 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2418 [`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
2419 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2422 Version 1.49.0 (2020-12-31)
2423 ============================
2426 -----------------------
2428 - [Unions can now implement `Drop`, and you can now have a field in a union
2429 with `ManuallyDrop<T>`.][77547]
2430 - [You can now cast uninhabited enums to integers.][76199]
2431 - [You can now bind by reference and by move in patterns.][76119] This
2432 allows you to selectively borrow individual components of a type. E.g.
2440 let person = Person {
2441 name: String::from("Alice"),
2445 // `name` is moved out of person, but `age` is referenced.
2446 let Person { name, ref age } = person;
2447 println!("{} {}", name, age);
2451 -----------------------
2453 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2454 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2455 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2456 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2457 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2458 - [Output from threads spawned in tests is now captured.][78227]
2459 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2461 \* Refer to Rust's [platform support page][platform-support-doc] for more
2462 information on Rust's tiered platform support.
2465 -----------------------
2467 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2468 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2473 - [`slice::select_nth_unstable`]
2474 - [`slice::select_nth_unstable_by`]
2475 - [`slice::select_nth_unstable_by_key`]
2477 The following previously stable methods are now `const`.
2479 - [`Poll::is_ready`]
2480 - [`Poll::is_pending`]
2483 -----------------------
2484 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2485 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2486 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2487 variable will be set if the crate being built is one the user selected to build, either
2488 with `-p` or through defaults.
2489 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2495 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2496 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2497 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2498 Previously such invalid or unused attributes could be ignored.
2499 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2500 read [this post about the changes][rustdoc-ws-post] for more details.
2501 - [Trait bounds are no longer inferred for associated types.][79904]
2505 These changes provide no direct user facing benefits, but represent significant
2506 improvements to the internals and overall performance of rustc and
2509 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2510 Local Storage model.][78201]
2511 - [Calculate visibilities once in resolve.][78077]
2512 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2513 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2516 [75991]: https://github.com/rust-lang/rust/pull/75991
2517 [78951]: https://github.com/rust-lang/rust/pull/78951
2518 [78848]: https://github.com/rust-lang/rust/pull/78848
2519 [78746]: https://github.com/rust-lang/rust/pull/78746
2520 [78376]: https://github.com/rust-lang/rust/pull/78376
2521 [78228]: https://github.com/rust-lang/rust/pull/78228
2522 [78227]: https://github.com/rust-lang/rust/pull/78227
2523 [78201]: https://github.com/rust-lang/rust/pull/78201
2524 [78109]: https://github.com/rust-lang/rust/pull/78109
2525 [78077]: https://github.com/rust-lang/rust/pull/78077
2526 [77997]: https://github.com/rust-lang/rust/pull/77997
2527 [77703]: https://github.com/rust-lang/rust/pull/77703
2528 [77547]: https://github.com/rust-lang/rust/pull/77547
2529 [77015]: https://github.com/rust-lang/rust/pull/77015
2530 [76199]: https://github.com/rust-lang/rust/pull/76199
2531 [76119]: https://github.com/rust-lang/rust/pull/76119
2532 [75914]: https://github.com/rust-lang/rust/pull/75914
2533 [79004]: https://github.com/rust-lang/rust/pull/79004
2534 [78676]: https://github.com/rust-lang/rust/pull/78676
2535 [79904]: https://github.com/rust-lang/rust/issues/79904
2536 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2537 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2538 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2539 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2540 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2541 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2542 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2543 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2544 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2545 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2547 Version 1.48.0 (2020-11-19)
2548 ==========================
2553 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2554 is still rejected *semantically*, but can now be parsed by procedural macros.
2558 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2559 `rustc` whether to link its own C runtime and libraries or to rely on a external
2560 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2561 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2562 Note: If you're using cargo you must explicitly pass the `--target` flag.
2563 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2565 \* Refer to Rust's [platform support page][platform-support-doc] for more
2566 information on Rust's tiered platform support.
2570 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2571 and `&Stderr`.][76275]
2572 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2573 - [The `matches!` macro now supports having a trailing comma.][74880]
2574 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2575 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2579 - [`slice::as_ptr_range`]
2580 - [`slice::as_mut_ptr_range`]
2581 - [`VecDeque::make_contiguous`]
2582 - [`future::pending`]
2585 The following previously stable methods are now `const fn`'s:
2587 - [`Option::is_some`]
2588 - [`Option::is_none`]
2589 - [`Option::as_ref`]
2591 - [`Result::is_err`]
2592 - [`Result::as_ref`]
2593 - [`Ordering::reverse`]
2594 - [`Ordering::then`]
2601 - [You can now link to items in `rustdoc` using the intra-doc link
2602 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2603 a link to `std::future`'s documentation. See ["Linking to items by
2604 name"][intradoc-links] for more information.
2605 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2606 when searching through `rustdoc`'s UI.][75740]
2610 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2611 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2612 promoted to `'static` lifetime any more inside `const fn`s.
2613 - [Associated type bindings on trait objects are now verified to meet the bounds
2614 declared on the trait when checking that they implement the trait.][27675]
2615 - [When trait bounds on associated types or opaque types are ambiguous, the
2616 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2617 - [Fixed recursive nonterminals not being expanded in macros during
2618 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2619 correctly handling recursive nonterminal tokens.
2620 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2621 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2622 in places where they have no effect.][73461]
2623 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2624 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2625 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2626 disallow zero-initialization.][71274]
2627 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2628 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2629 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2630 see the [`catch_unwind`] documentation for further information.
2636 These changes provide no direct user facing benefits, but represent significant
2637 improvements to the internals and overall performance of rustc and
2640 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2641 You can continue building with `make` by setting `ninja=false` in
2643 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2644 - [Made `ensure_sufficient_stack()` non-generic][76680]
2646 [78143]: https://github.com/rust-lang/rust/issues/78143
2647 [76680]: https://github.com/rust-lang/rust/pull/76680/
2648 [76030]: https://github.com/rust-lang/rust/pull/76030/
2649 [70212]: https://github.com/rust-lang/rust/pull/70212/
2650 [27675]: https://github.com/rust-lang/rust/issues/27675/
2651 [54121]: https://github.com/rust-lang/rust/issues/54121/
2652 [71274]: https://github.com/rust-lang/rust/pull/71274/
2653 [77386]: https://github.com/rust-lang/rust/pull/77386/
2654 [77153]: https://github.com/rust-lang/rust/pull/77153/
2655 [77055]: https://github.com/rust-lang/rust/pull/77055/
2656 [76275]: https://github.com/rust-lang/rust/pull/76275/
2657 [76310]: https://github.com/rust-lang/rust/pull/76310/
2658 [76420]: https://github.com/rust-lang/rust/pull/76420/
2659 [76158]: https://github.com/rust-lang/rust/pull/76158/
2660 [75857]: https://github.com/rust-lang/rust/pull/75857/
2661 [75585]: https://github.com/rust-lang/rust/pull/75585/
2662 [75740]: https://github.com/rust-lang/rust/pull/75740/
2663 [75502]: https://github.com/rust-lang/rust/pull/75502/
2664 [74880]: https://github.com/rust-lang/rust/pull/74880/
2665 [74922]: https://github.com/rust-lang/rust/pull/74922/
2666 [74430]: https://github.com/rust-lang/rust/pull/74430/
2667 [74194]: https://github.com/rust-lang/rust/pull/74194/
2668 [73461]: https://github.com/rust-lang/rust/pull/73461/
2669 [73166]: https://github.com/rust-lang/rust/pull/73166/
2670 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2671 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2672 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2673 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2674 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2675 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2676 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2677 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2678 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2679 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2680 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2681 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2682 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2683 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2684 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2687 Version 1.47.0 (2020-10-08)
2688 ==========================
2692 - [Closures will now warn when not used.][74869]
2696 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2697 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2699 - [Upgraded to LLVM 11.][73526]
2700 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2701 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2702 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2704 \* Refer to Rust's [platform support page][platform-support-doc] for more
2705 information on Rust's tiered platform support.
2709 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2710 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2711 those of length less than 33.][74060]
2712 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2713 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2714 `PartialEq`, and `PartialOrd`.][73583]
2718 - [`Ident::new_raw`]
2719 - [`Range::is_empty`]
2720 - [`RangeInclusive::is_empty`]
2721 - [`Result::as_deref`]
2722 - [`Result::as_deref_mut`]
2724 - [`pointer::offset_from`]
2728 The following previously stable APIs have now been made const.
2730 - [The `new` method for all `NonZero` integers.][73858]
2731 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2732 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2733 methods for all integers.][73858]
2734 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2735 signed integers.][73858]
2736 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2737 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2738 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2739 `is_ascii_control` methods for `char` and `u8`.][73858]
2743 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2744 You can override this by setting the following in your `Cargo.toml`.
2746 [profile.release.build-override]
2749 - [`cargo-help` will now display man pages for commands rather just the
2750 `--help` text.][cargo/8456]
2751 - [`cargo-metadata` now emits a `test` field indicating if a target has
2752 tests enabled.][cargo/8478]
2753 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2754 - [`cargo-publish` will now use an alternative registry by default if it's the
2755 only registry specified in `package.publish`.][cargo/8571]
2759 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2760 type based search.][75366]
2761 - [Added the Ayu theme to rustdoc.][71237]
2765 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2766 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2767 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2768 help to preserve more span information.][73084] These changes may cause
2769 compilation errors if your macro was unhygenic or didn't correctly handle
2771 - [Moved support for the CloudABI target to tier 3.][75568]
2772 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2773 - [Added the `rustc-docs` component.][75560] This allows you to install
2774 and read the documentation for the compiler internal APIs. (Currently only
2775 available for `x86_64-unknown-linux-gnu`.)
2780 - [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.
2782 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2783 [75048]: https://github.com/rust-lang/rust/pull/75048/
2784 [74163]: https://github.com/rust-lang/rust/pull/74163/
2785 [71237]: https://github.com/rust-lang/rust/pull/71237/
2786 [74869]: https://github.com/rust-lang/rust/pull/74869/
2787 [73858]: https://github.com/rust-lang/rust/pull/73858/
2788 [75716]: https://github.com/rust-lang/rust/pull/75716/
2789 [75560]: https://github.com/rust-lang/rust/pull/75560/
2790 [75568]: https://github.com/rust-lang/rust/pull/75568/
2791 [75366]: https://github.com/rust-lang/rust/pull/75366/
2792 [75204]: https://github.com/rust-lang/rust/pull/75204/
2793 [74650]: https://github.com/rust-lang/rust/pull/74650/
2794 [74419]: https://github.com/rust-lang/rust/pull/74419/
2795 [73964]: https://github.com/rust-lang/rust/pull/73964/
2796 [74021]: https://github.com/rust-lang/rust/pull/74021/
2797 [74060]: https://github.com/rust-lang/rust/pull/74060/
2798 [73893]: https://github.com/rust-lang/rust/pull/73893/
2799 [73526]: https://github.com/rust-lang/rust/pull/73526/
2800 [73583]: https://github.com/rust-lang/rust/pull/73583/
2801 [73084]: https://github.com/rust-lang/rust/pull/73084/
2802 [73197]: https://github.com/rust-lang/rust/pull/73197/
2803 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2804 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2805 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2806 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2807 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2808 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2809 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2810 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2811 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2812 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2813 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2814 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2815 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2816 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2819 Version 1.46.0 (2020-08-27)
2820 ==========================
2824 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2825 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2826 const functions.][73862]
2827 - [The `#[track_caller]` attribute can now be added to functions to use the
2828 function's caller's location information for panic messages.][72445]
2829 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2830 `x.0.0` over `(x.0).0`.
2831 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2832 You currently can't use `mem::transmute` in constant functions.
2836 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2837 - [Enabled static "Position Independent Executables" by default
2838 for `x86_64-unknown-linux-musl`.][70740]
2842 - [`mem::forget` is now a `const fn`.][73887]
2843 - [`String` now implements `From<char>`.][73466]
2844 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2845 integer types.][73032]
2846 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2847 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2848 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2849 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2850 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2851 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2856 - [`vec::Drain::as_slice`]
2860 Added a number of new environment variables that are now available when
2861 compiling your crate.
2863 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2864 the specific binary being compiled and the name of the crate.
2865 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2866 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2870 - [The target configuration option `abi_blacklist` has been renamed
2871 to `unsupported_abis`.][74150] The old name will still continue to work.
2872 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2873 This was previously accepted but will become a hard error in a future release.
2874 - [Rustc will fail to compile if you have a struct with
2875 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2877 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2878 ensure that spans have the correct information, and may cause breakage if you
2879 were relying on receiving spans with dummy information.
2880 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2881 a legacy installer that was replaced by a MSI installer a few years ago but
2882 was still being built.
2883 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2884 - [Rustc will no longer accept overlapping trait implementations that only
2885 differ in how the lifetime was bound.][72493]
2886 - [Rustc now correctly relates the lifetime of an existential associated
2887 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2888 you to pass a shorter lifetime than expected.
2889 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2890 The library will need to be installed for `rustc` to work, even though we
2891 expect it to be already available on most systems.
2892 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2894 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2895 exact output returned by rustc's pretty printing is an unstable
2896 implementation detail: we recommend any macro relying on it to switch to a
2897 more robust parsing system.
2899 [75453]: https://github.com/rust-lang/rust/issues/75453/
2900 [74820]: https://github.com/rust-lang/rust/issues/74820/
2901 [74420]: https://github.com/rust-lang/rust/issues/74420/
2902 [74109]: https://github.com/rust-lang/rust/pull/74109/
2903 [74150]: https://github.com/rust-lang/rust/pull/74150/
2904 [73862]: https://github.com/rust-lang/rust/pull/73862/
2905 [73887]: https://github.com/rust-lang/rust/pull/73887/
2906 [73466]: https://github.com/rust-lang/rust/pull/73466/
2907 [73516]: https://github.com/rust-lang/rust/pull/73516/
2908 [73293]: https://github.com/rust-lang/rust/pull/73293/
2909 [73007]: https://github.com/rust-lang/rust/pull/73007/
2910 [73032]: https://github.com/rust-lang/rust/pull/73032/
2911 [72920]: https://github.com/rust-lang/rust/pull/72920/
2912 [72569]: https://github.com/rust-lang/rust/pull/72569/
2913 [72583]: https://github.com/rust-lang/rust/pull/72583/
2914 [72584]: https://github.com/rust-lang/rust/pull/72584/
2915 [72717]: https://github.com/rust-lang/rust/pull/72717/
2916 [72437]: https://github.com/rust-lang/rust/pull/72437/
2917 [72445]: https://github.com/rust-lang/rust/pull/72445/
2918 [72486]: https://github.com/rust-lang/rust/pull/72486/
2919 [72493]: https://github.com/rust-lang/rust/pull/72493/
2920 [72331]: https://github.com/rust-lang/rust/pull/72331/
2921 [71896]: https://github.com/rust-lang/rust/pull/71896/
2922 [71660]: https://github.com/rust-lang/rust/pull/71660/
2923 [71322]: https://github.com/rust-lang/rust/pull/71322/
2924 [70740]: https://github.com/rust-lang/rust/pull/70740/
2925 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2926 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2927 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2928 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2929 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2932 Version 1.45.2 (2020-08-03)
2933 ==========================
2935 * [Fix bindings in tuple struct patterns][74954]
2936 * [Fix track_caller integration with trait objects][74784]
2938 [74954]: https://github.com/rust-lang/rust/issues/74954
2939 [74784]: https://github.com/rust-lang/rust/issues/74784
2942 Version 1.45.1 (2020-07-30)
2943 ==========================
2945 * [Fix const propagation with references.][73613]
2946 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2947 * [Avoid spurious implicit region bound.][74509]
2948 * [Install clippy on x.py install][74457]
2950 [73613]: https://github.com/rust-lang/rust/pull/73613
2951 [73078]: https://github.com/rust-lang/rust/issues/73078
2952 [74509]: https://github.com/rust-lang/rust/pull/74509
2953 [74457]: https://github.com/rust-lang/rust/pull/74457
2956 Version 1.45.0 (2020-07-16)
2957 ==========================
2961 - [Out of range float to int conversions using `as` has been defined as a saturating
2962 conversion.][71269] This was previously undefined behaviour, but you can use the
2963 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2964 may be desirable in rare performance sensitive situations.
2965 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2966 using `u64`.][70705]
2967 - [Function like procedural macros can now be used in expression, pattern, and statement
2968 positions.][68717] This means you can now use a function-like procedural macro
2969 anywhere you can use a declarative (`macro_rules!`) macro.
2973 - [You can now override individual target features through the `target-feature`
2974 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2975 equivalent to `-C target-feature=+avx2,+fma`.
2976 - [Added the `force-unwind-tables` flag.][69984] This option allows
2977 rustc to always generate unwind tables regardless of panic strategy.
2978 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2979 to include LLVM bitcode into generated `rlib`s (this is on by default).
2980 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2981 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2982 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2983 - [Upgraded to LLVM 10.][67759]
2985 \* Refer to Rust's [platform support page][platform-support-doc] for more
2986 information on Rust's tiered platform support.
2991 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2993 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2994 - [You can now use `char` with
2995 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2996 a range of codepoints.][72413] E.g.
2997 you can now write the following;
2999 for ch in 'a'..='z' {
3003 // Prints "abcdefghijklmnopqrstuvwxyz"
3005 - [`OsString` now implements `FromStr`.][71662]
3006 - [The `saturating_neg` method has been added to all signed integer primitive
3007 types, and the `saturating_abs` method has been added for all integer
3008 primitive types.][71886]
3009 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
3010 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
3012 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
3013 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
3014 integer types.][69813]
3015 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
3016 integer types.][72324]
3017 - [The `fetch_update` method has been added to all atomic integer types.][71843]
3022 - [`BTreeMap::remove_entry`]
3024 - [`rc::Weak::as_ptr`]
3025 - [`rc::Weak::from_raw`]
3026 - [`rc::Weak::into_raw`]
3027 - [`str::strip_prefix`]
3028 - [`str::strip_suffix`]
3029 - [`sync::Weak::as_ptr`]
3030 - [`sync::Weak::from_raw`]
3031 - [`sync::Weak::into_raw`]
3032 - [`char::UNICODE_VERSION`]
3033 - [`Span::resolved_at`]
3034 - [`Span::located_at`]
3035 - [`Span::mixed_site`]
3036 - [`unix::process::CommandExt::arg0`]
3041 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
3046 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
3047 `~~outdated information~~` becomes "~~outdated information~~".
3048 - [Added an emoji to Rustdoc's deprecated API message.][72014]
3052 - [Trying to self initialize a static value (that is creating a value using
3053 itself) is unsound and now causes a compile error.][71140]
3054 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
3055 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
3056 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
3057 previously undocumented and not intended for public use. Rustdoc still provides
3058 a non-zero exit code on errors.
3059 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
3060 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
3061 flags while cargo is adding `embed-bitcode` itself. The recommended way to
3062 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
3063 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
3067 - [Make clippy a git subtree instead of a git submodule][70655]
3068 - [Unify the undo log of all snapshot types][69464]
3070 [71848]: https://github.com/rust-lang/rust/issues/71848/
3071 [73420]: https://github.com/rust-lang/rust/issues/73420/
3072 [72324]: https://github.com/rust-lang/rust/pull/72324/
3073 [71843]: https://github.com/rust-lang/rust/pull/71843/
3074 [71886]: https://github.com/rust-lang/rust/pull/71886/
3075 [72234]: https://github.com/rust-lang/rust/pull/72234/
3076 [72239]: https://github.com/rust-lang/rust/pull/72239/
3077 [72397]: https://github.com/rust-lang/rust/pull/72397/
3078 [72413]: https://github.com/rust-lang/rust/pull/72413/
3079 [72014]: https://github.com/rust-lang/rust/pull/72014/
3080 [72062]: https://github.com/rust-lang/rust/pull/72062/
3081 [72094]: https://github.com/rust-lang/rust/pull/72094/
3082 [72133]: https://github.com/rust-lang/rust/pull/72133/
3083 [67759]: https://github.com/rust-lang/rust/pull/67759/
3084 [71900]: https://github.com/rust-lang/rust/pull/71900/
3085 [71928]: https://github.com/rust-lang/rust/pull/71928/
3086 [71662]: https://github.com/rust-lang/rust/pull/71662/
3087 [71716]: https://github.com/rust-lang/rust/pull/71716/
3088 [71447]: https://github.com/rust-lang/rust/pull/71447/
3089 [71269]: https://github.com/rust-lang/rust/pull/71269/
3090 [71095]: https://github.com/rust-lang/rust/pull/71095/
3091 [71140]: https://github.com/rust-lang/rust/pull/71140/
3092 [70655]: https://github.com/rust-lang/rust/pull/70655/
3093 [70705]: https://github.com/rust-lang/rust/pull/70705/
3094 [69984]: https://github.com/rust-lang/rust/pull/69984/
3095 [69813]: https://github.com/rust-lang/rust/pull/69813/
3096 [69464]: https://github.com/rust-lang/rust/pull/69464/
3097 [68717]: https://github.com/rust-lang/rust/pull/68717/
3098 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
3099 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
3100 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
3101 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
3102 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3103 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3104 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3105 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3106 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3107 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3108 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3109 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3110 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3111 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3112 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3113 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3114 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3117 Version 1.44.1 (2020-06-18)
3118 ===========================
3120 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3121 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3122 * [Fix crashes when finding backtrace on macOS.][71397]
3123 * [Clippy applies lint levels into different files.][clippy/5356]
3125 [71397]: https://github.com/rust-lang/rust/issues/71397
3126 [73078]: https://github.com/rust-lang/rust/issues/73078
3127 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3128 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3131 Version 1.44.0 (2020-06-04)
3132 ==========================
3136 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3137 - [Added the `unused_braces` lint.][70081]
3139 **Syntax-only changes**
3141 - [Expansion-driven outline module parsing][69838]
3146 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3151 These are still rejected semantically, so you will likely receive an error but
3152 these changes can be seen and parsed by macros and conditional compilation.
3156 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3157 Additionally when in incremental mode rustc defaults to 256 codegen units.
3158 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3159 a panic is thrown.][67502]
3160 - [Added tier 3\* support for the `aarch64-unknown-none` and
3161 `aarch64-unknown-none-softfloat` targets.][68334]
3162 - [Added tier 3 support for `arm64-apple-tvos` and
3163 `x86_64-apple-tvos` targets.][68191]
3168 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3169 `vec![]` to be able to be used in `const` contexts.
3170 - [`convert::Infallible` now implements `Hash`.][70281]
3171 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3172 a `&mut OsStr`.][70048]
3173 - [Unicode 13 is now supported.][69929]
3174 - [`String` now implements `From<&mut str>`.][69661]
3175 - [`IoSlice` now implements `Copy`.][69403]
3176 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3177 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3178 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3179 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3180 integer types.][69373]
3184 - [`PathBuf::with_capacity`]
3185 - [`PathBuf::capacity`]
3186 - [`PathBuf::clear`]
3187 - [`PathBuf::reserve`]
3188 - [`PathBuf::reserve_exact`]
3189 - [`PathBuf::shrink_to_fit`]
3190 - [`f32::to_int_unchecked`]
3191 - [`f64::to_int_unchecked`]
3192 - [`Layout::align_to`]
3193 - [`Layout::pad_to_align`]
3195 - [`Layout::extend`]
3199 - [Added the `cargo tree` command which will print a tree graph of
3200 your dependencies.][cargo/8062] E.g.
3202 mdbook v0.3.2 (/Users/src/rust/mdbook)
3204 │ ├── html5ever v0.24.0
3206 │ │ │ └── cfg-if v0.1.9
3208 │ │ └── markup5ever v0.9.0
3209 │ │ ├── log v0.4.8 (*)
3211 │ │ │ └── phf_shared v0.7.24
3212 │ │ │ ├── siphasher v0.2.3
3213 │ │ │ └── unicase v1.4.2
3214 │ │ │ [build-dependencies]
3215 │ │ │ └── version_check v0.1.5
3218 You can also display dependencies on multiple versions of the same crate with
3219 `cargo tree -d` (short for `cargo tree --duplicates`).
3223 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3224 the version in the sidebar.][69494]
3228 - [Rustc now correctly generates static libraries on Windows GNU targets with
3229 the `.a` extension, rather than the previous `.lib`.][70937]
3230 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3231 - [The `file_name` property in JSON output of macro errors now points the actual
3232 source file rather than the previous format of `<NAME macros>`.][70969]
3233 **Note:** this may not point to a file that actually exists on the user's system.
3234 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3235 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3236 not allow zero initialization such as `NonZeroU8`.][66059] This was
3237 previously a warning.
3238 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3239 operator has been defined as a saturating operation.][71269] This was previously
3240 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3241 continue using the current behaviour, which may be desirable in rare performance
3242 sensitive situations.
3246 These changes provide no direct user facing benefits, but represent significant
3247 improvements to the internals and overall performance of rustc and
3250 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3251 - [Replace big JS dict with JSON parsing.][71250]
3253 [69373]: https://github.com/rust-lang/rust/pull/69373/
3254 [66059]: https://github.com/rust-lang/rust/pull/66059/
3255 [68191]: https://github.com/rust-lang/rust/pull/68191/
3256 [68899]: https://github.com/rust-lang/rust/pull/68899/
3257 [71147]: https://github.com/rust-lang/rust/pull/71147/
3258 [71250]: https://github.com/rust-lang/rust/pull/71250/
3259 [70937]: https://github.com/rust-lang/rust/pull/70937/
3260 [70969]: https://github.com/rust-lang/rust/pull/70969/
3261 [70632]: https://github.com/rust-lang/rust/pull/70632/
3262 [70281]: https://github.com/rust-lang/rust/pull/70281/
3263 [70345]: https://github.com/rust-lang/rust/pull/70345/
3264 [70048]: https://github.com/rust-lang/rust/pull/70048/
3265 [70081]: https://github.com/rust-lang/rust/pull/70081/
3266 [70156]: https://github.com/rust-lang/rust/pull/70156/
3267 [71269]: https://github.com/rust-lang/rust/pull/71269/
3268 [69838]: https://github.com/rust-lang/rust/pull/69838/
3269 [69929]: https://github.com/rust-lang/rust/pull/69929/
3270 [69661]: https://github.com/rust-lang/rust/pull/69661/
3271 [69778]: https://github.com/rust-lang/rust/pull/69778/
3272 [69494]: https://github.com/rust-lang/rust/pull/69494/
3273 [69403]: https://github.com/rust-lang/rust/pull/69403/
3274 [69033]: https://github.com/rust-lang/rust/pull/69033/
3275 [68692]: https://github.com/rust-lang/rust/pull/68692/
3276 [68334]: https://github.com/rust-lang/rust/pull/68334/
3277 [67502]: https://github.com/rust-lang/rust/pull/67502/
3278 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3279 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3280 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3281 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3282 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3283 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3284 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3285 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3286 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3287 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3288 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3289 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3290 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3293 Version 1.43.1 (2020-05-07)
3294 ===========================
3296 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3297 * [Fixed the stabilization of AVX-512 features.][71473]
3298 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3300 [71430]: https://github.com/rust-lang/rust/pull/71430
3301 [71473]: https://github.com/rust-lang/rust/issues/71473
3302 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3305 Version 1.43.0 (2020-04-23)
3306 ==========================
3310 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3311 the type inferred correctly.][68129]
3312 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3314 **Syntax only changes**
3315 - [Allow `type Foo: Ord` syntactically.][69361]
3316 - [Fuse associated and extern items up to defaultness.][69194]
3317 - [Syntactically allow `self` in all `fn` contexts.][68764]
3318 - [Merge `fn` syntax + cleanup item parsing.][68728]
3319 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3320 For example, you may now write:
3322 macro_rules! mac_trait {
3332 These are still rejected *semantically*, so you will likely receive an error but
3333 these changes can be seen and parsed by macros and
3334 conditional compilation.
3339 - [You can now pass multiple lint flags to rustc to override the previous
3340 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3341 everything in the `unused` lint group except `unused-variables` which
3342 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3343 everything in the `unused` lint group **including** `unused-variables` since
3344 the allow flag is specified before the deny flag (and therefore overridden).
3345 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3346 if they are available on `windows-gnu`.][67429]
3347 - [rustc now buffers errors/warnings printed in JSON.][69227]
3351 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3352 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3353 respectively.][69538] **Note** These conversions are only available when `N`
3355 - [You can now use associated constants on floats and integers directly, rather
3356 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3357 `f32::NAN` with no imports.
3358 - [`u8::is_ascii` is now `const`.][68984]
3359 - [`String` now implements `AsMut<str>`.][68742]
3360 - [Added the `primitive` module to `std` and `core`.][67637] This module
3361 reexports Rust's primitive types. This is mainly useful in macros
3362 where you want avoid these types being shadowed.
3363 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3364 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3368 - [`Once::is_completed`]
3373 - [`iter::once_with`]
3377 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3378 your environment.][cargo/7823]
3379 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3380 executable path when running integration tests or benchmarks.][cargo/7697]
3381 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3382 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3386 - [Certain checks in the `const_err` lint were deemed unrelated to const
3387 evaluation][69185], and have been moved to the `unconditional_panic` and
3388 `arithmetic_overflow` lints.
3393 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3394 has been a warning since 1.36.0.
3395 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3396 led to some instances being accepted, and now correctly emits a hard error.
3398 [69340]: https://github.com/rust-lang/rust/pull/69340
3402 These changes provide no direct user facing benefits, but represent significant
3403 improvements to the internals and overall performance of `rustc` and
3406 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3407 - [Improved how rustc generates drop code.][67332]
3408 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3409 - [traits: preallocate 2 Vecs of known initial size][69022]
3410 - [Avoid exponential behaviour when relating types][68772]
3411 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3412 - [Improve performance of coherence checks][68966]
3413 - [Deduplicate types in the generator witness][68672]
3414 - [Invert control in struct_lint_level.][68725]
3416 [67332]: https://github.com/rust-lang/rust/pull/67332/
3417 [67429]: https://github.com/rust-lang/rust/pull/67429/
3418 [67637]: https://github.com/rust-lang/rust/pull/67637/
3419 [67642]: https://github.com/rust-lang/rust/pull/67642/
3420 [67878]: https://github.com/rust-lang/rust/pull/67878/
3421 [67885]: https://github.com/rust-lang/rust/pull/67885/
3422 [68129]: https://github.com/rust-lang/rust/pull/68129/
3423 [68672]: https://github.com/rust-lang/rust/pull/68672/
3424 [68725]: https://github.com/rust-lang/rust/pull/68725/
3425 [68728]: https://github.com/rust-lang/rust/pull/68728/
3426 [68738]: https://github.com/rust-lang/rust/pull/68738/
3427 [68742]: https://github.com/rust-lang/rust/pull/68742/
3428 [68764]: https://github.com/rust-lang/rust/pull/68764/
3429 [68772]: https://github.com/rust-lang/rust/pull/68772/
3430 [68943]: https://github.com/rust-lang/rust/pull/68943/
3431 [68952]: https://github.com/rust-lang/rust/pull/68952/
3432 [68966]: https://github.com/rust-lang/rust/pull/68966/
3433 [68984]: https://github.com/rust-lang/rust/pull/68984/
3434 [69022]: https://github.com/rust-lang/rust/pull/69022/
3435 [69185]: https://github.com/rust-lang/rust/pull/69185/
3436 [69194]: https://github.com/rust-lang/rust/pull/69194/
3437 [69201]: https://github.com/rust-lang/rust/pull/69201/
3438 [69227]: https://github.com/rust-lang/rust/pull/69227/
3439 [69548]: https://github.com/rust-lang/rust/pull/69548/
3440 [69256]: https://github.com/rust-lang/rust/pull/69256/
3441 [69361]: https://github.com/rust-lang/rust/pull/69361/
3442 [69366]: https://github.com/rust-lang/rust/pull/69366/
3443 [69538]: https://github.com/rust-lang/rust/pull/69538/
3444 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3445 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3446 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3447 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3448 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3449 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3450 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3451 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3454 Version 1.42.0 (2020-03-12)
3455 ==========================
3459 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3461 fn foo(words: &[&str]) {
3463 ["Hello", "World", "!", ..] => println!("Hello World!"),
3464 ["Foo", "Bar", ..] => println!("Baz"),
3465 rest => println!("{:?}", rest),
3469 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3470 that you can create an enum that has the exact layout and ABI of the type
3472 - [You can now use outer attribute procedural macros on inline modules.][64273]
3473 - [There are some *syntax-only* changes:][67131]
3474 - `default` is syntactically allowed before items in `trait` definitions.
3475 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3476 leave out their bodies in favor of `;`.
3477 - Bounds on associated types in `impl`s are now syntactically allowed
3478 (e.g. `type Foo: Ord;`).
3479 - `...` (the C-variadic type) may occur syntactically directly as the type of
3480 any function parameter.
3482 These are still rejected *semantically*, so you will likely receive an error
3483 but these changes can be seen and parsed by procedural macros and
3484 conditional compilation.
3488 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3489 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3490 - [`Option::{expect,unwrap}` and
3491 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3492 pointing to the location where they were called, rather than
3493 `core`'s internals. ][67887]
3495 \* Refer to Rust's [platform support page][platform-support-doc] for more
3496 information on Rust's tiered platform support.
3500 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3501 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3502 to implement `Sized`.][67935]
3503 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3504 - [`Layout::new` is now `const`.][66254]
3505 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3510 - [`CondVar::wait_while`]
3511 - [`CondVar::wait_timeout_while`]
3513 - [`DebugMap::value`]
3514 - [`ManuallyDrop::take`]
3516 - [`ptr::slice_from_raw_parts_mut`]
3517 - [`ptr::slice_from_raw_parts`]
3521 - [You no longer need to include `extern crate proc_macro;` to be able to
3522 `use proc_macro;` in the `2018` edition.][cargo/7700]
3526 - [`Error::description` has been deprecated, and its use will now produce a
3527 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3529 [68253]: https://github.com/rust-lang/rust/pull/68253/
3530 [68348]: https://github.com/rust-lang/rust/pull/68348/
3531 [67935]: https://github.com/rust-lang/rust/pull/67935/
3532 [68339]: https://github.com/rust-lang/rust/pull/68339/
3533 [68122]: https://github.com/rust-lang/rust/pull/68122/
3534 [64273]: https://github.com/rust-lang/rust/pull/64273/
3535 [67712]: https://github.com/rust-lang/rust/pull/67712/
3536 [67887]: https://github.com/rust-lang/rust/pull/67887/
3537 [67131]: https://github.com/rust-lang/rust/pull/67131/
3538 [67233]: https://github.com/rust-lang/rust/pull/67233/
3539 [66899]: https://github.com/rust-lang/rust/pull/66899/
3540 [66919]: https://github.com/rust-lang/rust/pull/66919/
3541 [66254]: https://github.com/rust-lang/rust/pull/66254/
3542 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3543 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3544 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3545 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3546 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3547 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3548 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3549 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3550 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3553 Version 1.41.1 (2020-02-27)
3554 ===========================
3556 * [Always check types of static items][69145]
3557 * [Always check lifetime bounds of `Copy` impls][69145]
3558 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3560 [69225]: https://github.com/rust-lang/rust/issues/69225
3561 [69145]: https://github.com/rust-lang/rust/pull/69145
3564 Version 1.41.0 (2020-01-30)
3565 ===========================
3570 - [You can now pass type parameters to foreign items when implementing
3571 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3572 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3573 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3574 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3575 - [You can now use any valid identifier in a `format_args` macro.][66847]
3576 Previously identifiers starting with an underscore were not allowed.
3577 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3578 enum variants.][66183] These are still rejected semantically, but
3579 can be seen and parsed by procedural macros and conditional compilation.
3580 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3581 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3582 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3584 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3589 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3590 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3591 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3592 - [You can now pass an arguments file passing the `@path` syntax
3593 to rustc.][66172] Note that the format differs somewhat from what is
3594 found in other tooling; please see [the documentation][argfile-docs] for
3596 - [You can now provide `--extern` flag without a path, indicating that it is
3597 available from the search path or specified with an `-L` flag.][64882]
3599 \* Refer to Rust's [platform support page][platform-support-doc] for more
3600 information on Rust's tiered platform support.
3602 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3607 - [The `core::panic` module is now stable.][66771] It was already stable
3609 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3610 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3611 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3616 - [`Result::map_or`]
3617 - [`Result::map_or_else`]
3618 - [`std::rc::Weak::weak_count`]
3619 - [`std::rc::Weak::strong_count`]
3620 - [`std::sync::Weak::weak_count`]
3621 - [`std::sync::Weak::strong_count`]
3626 - [Cargo will now document all the private items for binary crates
3627 by default.][cargo/7593]
3628 - [`cargo-install` will now reinstall the package if it detects that it is out
3629 of date.][cargo/7560]
3630 - [Cargo.lock now uses a more git friendly format that should help to reduce
3631 merge conflicts.][cargo/7579]
3632 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3633 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3634 optimisation level to `2` for debug builds. You can also use
3635 `[profile.<profile>.build-override]` to override build scripts and
3641 - [You can now specify `edition` in documentation code blocks to compile the block
3642 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3643 should be compiled the 2018 edition of Rust.
3644 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3645 current theme with `--check-theme`.][54733]
3646 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3651 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3652 Apple targets.][apple-32bit-drop] This means that the source code is still
3653 available to build, but the targets are no longer being tested and release
3654 binaries for those platforms will no longer be distributed by the Rust project.
3655 Please refer to the linked blog post for more information.
3657 [54733]: https://github.com/rust-lang/rust/pull/54733/
3658 [61351]: https://github.com/rust-lang/rust/pull/61351/
3659 [62514]: https://github.com/rust-lang/rust/pull/62514/
3660 [67255]: https://github.com/rust-lang/rust/pull/67255/
3661 [66661]: https://github.com/rust-lang/rust/pull/66661/
3662 [66771]: https://github.com/rust-lang/rust/pull/66771/
3663 [66847]: https://github.com/rust-lang/rust/pull/66847/
3664 [66238]: https://github.com/rust-lang/rust/pull/66238/
3665 [66277]: https://github.com/rust-lang/rust/pull/66277/
3666 [66325]: https://github.com/rust-lang/rust/pull/66325/
3667 [66172]: https://github.com/rust-lang/rust/pull/66172/
3668 [66183]: https://github.com/rust-lang/rust/pull/66183/
3669 [65879]: https://github.com/rust-lang/rust/pull/65879/
3670 [65013]: https://github.com/rust-lang/rust/pull/65013/
3671 [64882]: https://github.com/rust-lang/rust/pull/64882/
3672 [64325]: https://github.com/rust-lang/rust/pull/64325/
3673 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3674 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3675 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3676 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3677 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3678 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3679 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3680 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3681 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3682 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3683 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3685 Version 1.40.0 (2019-12-19)
3686 ===========================
3690 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3691 `const` contexts.][65188] e.g.
3694 pub struct Point(i32, i32);
3696 const ORIGIN: Point = {
3697 let constructor = Point;
3703 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3704 indicate that there may be variants or fields added in the future.][64639]
3705 For example this requires adding a wild-card branch (`_ => {}`) to any match
3706 statements on a non-exhaustive `enum`. [(RFC 2008)]
3707 - [You can now use function-like procedural macros in `extern` blocks and in
3708 type positions.][63931] e.g. `type Generated = macro!();`
3709 - [Function-like and attribute procedural macros can now emit
3710 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3711 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3712 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3713 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3717 - [Added tier 3 support\* for the
3718 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3719 - [Added tier 3 support for the
3720 `aarch64-unknown-none-softfloat` target.][64589]
3721 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3722 `mips64el-unknown-linux-muslabi64` targets.][65843]
3724 \* Refer to Rust's [platform support page][platform-support-doc] for more
3725 information on Rust's tiered platform support.
3729 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3733 - [`BTreeMap::get_key_value`]
3734 - [`HashMap::get_key_value`]
3735 - [`Option::as_deref_mut`]
3736 - [`Option::as_deref`]
3737 - [`Option::flatten`]
3738 - [`UdpSocket::peer_addr`]
3739 - [`f32::to_be_bytes`]
3740 - [`f32::to_le_bytes`]
3741 - [`f32::to_ne_bytes`]
3742 - [`f64::to_be_bytes`]
3743 - [`f64::to_le_bytes`]
3744 - [`f64::to_ne_bytes`]
3745 - [`f32::from_be_bytes`]
3746 - [`f32::from_le_bytes`]
3747 - [`f32::from_ne_bytes`]
3748 - [`f64::from_be_bytes`]
3749 - [`f64::from_le_bytes`]
3750 - [`f64::from_ne_bytes`]
3757 - [Cargo will now always display warnings, rather than only on
3758 fresh builds.][cargo/7450]
3759 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3760 now produce an error.][cargo/7507] Previously these flags were ignored.
3761 - [You can now publish `dev-dependencies` without including
3762 a `version`.][cargo/7333]
3766 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3767 when running documentation tests with `rustdoc`.][63803]
3771 - [As previously announced, any previous NLL warnings in the 2015 edition are
3772 now hard errors.][64221]
3773 - [The `include!` macro will now warn if it failed to include the
3774 entire file.][64284] The `include!` macro unintentionally only includes the
3775 first _expression_ in a file, and this can be unintuitive. This will become
3776 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3777 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3778 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3779 or `extern` blocks now correctly emits a hard error.
3781 [65294]: https://github.com/rust-lang/rust/pull/65294/
3782 [66103]: https://github.com/rust-lang/rust/pull/66103/
3783 [65843]: https://github.com/rust-lang/rust/pull/65843/
3784 [65188]: https://github.com/rust-lang/rust/pull/65188/
3785 [65092]: https://github.com/rust-lang/rust/pull/65092/
3786 [64589]: https://github.com/rust-lang/rust/pull/64589/
3787 [64639]: https://github.com/rust-lang/rust/pull/64639/
3788 [64221]: https://github.com/rust-lang/rust/pull/64221/
3789 [64284]: https://github.com/rust-lang/rust/pull/64284/
3790 [63931]: https://github.com/rust-lang/rust/pull/63931/
3791 [64035]: https://github.com/rust-lang/rust/pull/64035/
3792 [63674]: https://github.com/rust-lang/rust/pull/63674/
3793 [63803]: https://github.com/rust-lang/rust/pull/63803/
3794 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3795 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3796 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3797 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3798 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3799 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3800 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3801 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3802 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3803 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3804 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3805 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3806 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3807 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3808 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3809 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3810 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3811 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3812 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3813 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3814 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3815 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3816 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3817 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3818 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3821 Version 1.39.0 (2019-11-07)
3822 ===========================
3826 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3827 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3828 - [You can now use certain attributes on function, closure, and function pointer
3829 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3830 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3831 attributes applied to items. e.g.
3834 #[cfg(windows)] slice: &[u16],
3835 #[cfg(not(windows))] slice: &[u8],
3840 - [You can now take shared references to bind-by-move patterns in the `if` guards
3841 of `match` arms.][63118] e.g.
3844 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3848 // ---- `nums` is bound by move.
3849 if nums.iter().sum::<u8>() == 10
3850 // ^------ `.iter()` implicitly takes a reference to `nums`.
3853 // ----------- Legal as `nums` was bound by move and so we have ownership.
3855 _ => unreachable!(),
3864 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3865 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3866 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3867 **Note** Cargo currently doesn't use this feature. Refer to
3868 [cargo#7315][cargo/7315] to track this feature's progress.
3869 - [You can now pass `--show-output` argument to test binaries to print the
3870 output of successful tests.][62600]
3873 \* Refer to Rust's [platform support page][platform-support-doc] for more
3874 information on Rust's tiered platform support.
3878 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3879 - [`LinkedList::new` is now a `const` function.][63684]
3880 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3881 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3882 now `const`.][63786]
3886 - [`Pin::into_inner`]
3887 - [`Instant::checked_duration_since`]
3888 - [`Instant::saturating_duration_since`]
3892 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3893 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3894 `--all` is now deprecated.
3898 - [You can now pass `-Clinker` to rustdoc to control the linker used
3899 for compiling doctests.][63834]
3903 - [Code that was previously accepted by the old borrow checker, but rejected by
3904 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3905 previously a warning, and will also become a hard error in the Rust 2015
3906 edition in the 1.40.0 release.
3907 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3908 run tests.][63827] This should improve performance when running a large
3910 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3911 recommended to use the `?` operator instead.
3912 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3915 [62600]: https://github.com/rust-lang/rust/pull/62600/
3916 [62672]: https://github.com/rust-lang/rust/pull/62672/
3917 [63118]: https://github.com/rust-lang/rust/pull/63118/
3918 [63209]: https://github.com/rust-lang/rust/pull/63209/
3919 [63402]: https://github.com/rust-lang/rust/pull/63402/
3920 [63565]: https://github.com/rust-lang/rust/pull/63565/
3921 [63595]: https://github.com/rust-lang/rust/pull/63595/
3922 [63684]: https://github.com/rust-lang/rust/pull/63684/
3923 [63698]: https://github.com/rust-lang/rust/pull/63698/
3924 [63770]: https://github.com/rust-lang/rust/pull/63770/
3925 [63786]: https://github.com/rust-lang/rust/pull/63786/
3926 [63827]: https://github.com/rust-lang/rust/pull/63827/
3927 [63834]: https://github.com/rust-lang/rust/pull/63834/
3928 [64010]: https://github.com/rust-lang/rust/pull/64010/
3929 [64028]: https://github.com/rust-lang/rust/pull/64028/
3930 [64334]: https://github.com/rust-lang/rust/pull/64334/
3931 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3932 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3933 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3934 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3935 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3936 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3938 Version 1.38.0 (2019-09-26)
3939 ==========================
3943 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3944 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3948 - [Added pipelined compilation support to `rustc`.][62766] This will
3949 improve compilation times in some cases. For further information please refer
3950 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3951 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3952 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3953 `x86_64-uwp-windows-msvc` targets.][60260]
3954 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3955 `armv7-unknown-linux-musleabi` targets.][63107]
3956 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3957 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3958 - [Upgraded to LLVM 9.][62592]
3960 \* Refer to Rust's [platform support page][platform-support-doc] for more
3961 information on Rust's tiered platform support.
3965 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3966 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3967 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3968 is available at `std::clone::Clone`). This also makes all built-in macros
3969 available in `std`/`core` root. e.g. `std::include_bytes!`.
3970 - [`str::Chars` now implements `Debug`.][63000]
3971 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3972 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3973 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3974 - [Added euclidean remainder and division operations (`div_euclid`,
3975 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3976 `overflowing`, and `wrapping` versions are available for all
3978 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3979 `PartialEq`.][61491]
3980 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3984 - [`<*const T>::cast`]
3985 - [`<*mut T>::cast`]
3986 - [`Duration::as_secs_f32`]
3987 - [`Duration::as_secs_f64`]
3988 - [`Duration::div_f32`]
3989 - [`Duration::div_f64`]
3990 - [`Duration::from_secs_f32`]
3991 - [`Duration::from_secs_f64`]
3992 - [`Duration::mul_f32`]
3993 - [`Duration::mul_f64`]
3994 - [`any::type_name`]
3998 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3999 - [You can now pass the `--features` option multiple times to enable
4000 multiple features.][cargo/7084]
4005 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
4009 - [`rustc` will now warn about some incorrect uses of
4010 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
4014 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
4016 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
4017 issues][62896] with certain crates such as libc.
4019 [60260]: https://github.com/rust-lang/rust/pull/60260/
4020 [61457]: https://github.com/rust-lang/rust/pull/61457/
4021 [61491]: https://github.com/rust-lang/rust/pull/61491/
4022 [61884]: https://github.com/rust-lang/rust/pull/61884/
4023 [61953]: https://github.com/rust-lang/rust/pull/61953/
4024 [62042]: https://github.com/rust-lang/rust/pull/62042/
4025 [62528]: https://github.com/rust-lang/rust/pull/62528/
4026 [62583]: https://github.com/rust-lang/rust/pull/62583/
4027 [62735]: https://github.com/rust-lang/rust/pull/62735/
4028 [62766]: https://github.com/rust-lang/rust/pull/62766/
4029 [62784]: https://github.com/rust-lang/rust/pull/62784/
4030 [62592]: https://github.com/rust-lang/rust/pull/62592/
4031 [62785]: https://github.com/rust-lang/rust/issues/62785/
4032 [62814]: https://github.com/rust-lang/rust/pull/62814/
4033 [62896]: https://github.com/rust-lang/rust/issues/62896/
4034 [63000]: https://github.com/rust-lang/rust/pull/63000/
4035 [63056]: https://github.com/rust-lang/rust/pull/63056/
4036 [63107]: https://github.com/rust-lang/rust/pull/63107/
4037 [63346]: https://github.com/rust-lang/rust/pull/63346/
4038 [63421]: https://github.com/rust-lang/rust/pull/63421/
4039 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
4040 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
4041 [63048]: https://github.com/rust-lang/rust/pull/63048
4042 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4043 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4044 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
4045 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
4046 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
4047 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
4048 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
4049 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
4050 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
4051 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
4052 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
4053 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
4054 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
4056 Version 1.37.0 (2019-08-15)
4057 ==========================
4061 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
4062 [`Box`][62228], or an [array][62235] and unused.
4063 - [You can now use the `cfg` and `cfg_attr` attributes on
4064 generic parameters.][61547]
4065 - [You can now use enum variants through type alias.][61682] e.g. You can
4066 write the following:
4068 type MyOption = Option<u8>;
4070 fn increment_or_zero(x: MyOption) -> u8 {
4072 MyOption::Some(y) => y + 1,
4073 MyOption::None => 0,
4077 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
4078 `const _: u32 = 5;`.
4079 - [You can now use `#[repr(align(X)]` on enums.][61229]
4080 - [The `?` Kleene macro operator is now available in the
4081 2015 edition.][60932]
4085 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
4086 and `-C profile-use` flags.][61268] For more information on how to use profile
4087 guided optimization, please refer to the [rustc book][rustc-book-pgo].
4088 - [The `rust-lldb` wrapper script should now work again.][61827]
4092 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
4096 - [`BufReader::buffer`]
4097 - [`BufWriter::buffer`]
4098 - [`Cell::from_mut`]
4099 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
4100 - [`DoubleEndedIterator::nth_back`]
4102 - [`Wrapping::reverse_bits`]
4103 - [`i128::reverse_bits`]
4104 - [`i16::reverse_bits`]
4105 - [`i32::reverse_bits`]
4106 - [`i64::reverse_bits`]
4107 - [`i8::reverse_bits`]
4108 - [`isize::reverse_bits`]
4109 - [`slice::copy_within`]
4110 - [`u128::reverse_bits`]
4111 - [`u16::reverse_bits`]
4112 - [`u32::reverse_bits`]
4113 - [`u64::reverse_bits`]
4114 - [`u8::reverse_bits`]
4115 - [`usize::reverse_bits`]
4119 - [`Cargo.lock` files are now included by default when publishing executable crates
4120 with executables.][cargo/7026]
4121 - [You can now specify `default-run="foo"` in `[package]` to specify the
4122 default executable to use for `cargo run`.][cargo/7056]
4129 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4130 Please transition your code to using the `..=` syntax for inclusive
4132 - [Using a trait object without the `dyn` will now warn by default.][61203]
4133 Please transition your code to use `dyn Trait` for trait objects instead.
4135 [62228]: https://github.com/rust-lang/rust/pull/62228/
4136 [62235]: https://github.com/rust-lang/rust/pull/62235/
4137 [61802]: https://github.com/rust-lang/rust/pull/61802/
4138 [61827]: https://github.com/rust-lang/rust/pull/61827/
4139 [61547]: https://github.com/rust-lang/rust/pull/61547/
4140 [61682]: https://github.com/rust-lang/rust/pull/61682/
4141 [61268]: https://github.com/rust-lang/rust/pull/61268/
4142 [61342]: https://github.com/rust-lang/rust/pull/61342/
4143 [61347]: https://github.com/rust-lang/rust/pull/61347/
4144 [61100]: https://github.com/rust-lang/rust/pull/61100/
4145 [61203]: https://github.com/rust-lang/rust/pull/61203/
4146 [61229]: https://github.com/rust-lang/rust/pull/61229/
4147 [60932]: https://github.com/rust-lang/rust/pull/60932/
4148 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4149 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4150 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4151 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4152 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4153 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4154 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4155 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4156 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4157 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4158 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4159 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4160 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4161 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4162 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4163 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4164 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4165 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4166 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4167 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4168 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4169 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4170 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4173 Version 1.36.0 (2019-07-04)
4174 ==========================
4178 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4179 - [The order of traits in trait objects no longer affects the semantics of that
4180 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4181 `dyn fmt::Debug + Send`, where this was previously not the case.
4185 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4186 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4187 - [`mem::needs_drop` is now available as a const fn.][60364]
4188 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4189 - [`String` now implements `BorrowMut<str>`.][60404]
4190 - [`io::Cursor` now implements `Default`.][60234]
4191 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4192 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4193 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4194 environment has access to heap memory allocation.
4195 - [`String` now implements `From<&String>`.][59825]
4196 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4197 return a tuple of each argument when there is multiple arguments.
4198 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4203 - [`VecDeque::rotate_left`]
4204 - [`VecDeque::rotate_right`]
4205 - [`Iterator::copied`]
4207 - [`io::IoSliceMut`]
4208 - [`Read::read_vectored`]
4209 - [`Write::write_vectored`]
4210 - [`str::as_mut_ptr`]
4211 - [`mem::MaybeUninit`]
4212 - [`pointer::align_offset`]
4213 - [`future::Future`]
4215 - [`task::RawWaker`]
4216 - [`task::RawWakerVTable`]
4222 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4223 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4225 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4229 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4236 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4237 longer recommended, and will be deprecated in 1.39.0.
4239 [60318]: https://github.com/rust-lang/rust/pull/60318/
4240 [60364]: https://github.com/rust-lang/rust/pull/60364/
4241 [60370]: https://github.com/rust-lang/rust/pull/60370/
4242 [60404]: https://github.com/rust-lang/rust/pull/60404/
4243 [60234]: https://github.com/rust-lang/rust/pull/60234/
4244 [60244]: https://github.com/rust-lang/rust/pull/60244/
4245 [58623]: https://github.com/rust-lang/rust/pull/58623/
4246 [59648]: https://github.com/rust-lang/rust/pull/59648/
4247 [59675]: https://github.com/rust-lang/rust/pull/59675/
4248 [59825]: https://github.com/rust-lang/rust/pull/59825/
4249 [59826]: https://github.com/rust-lang/rust/pull/59826/
4250 [59445]: https://github.com/rust-lang/rust/pull/59445/
4251 [59114]: https://github.com/rust-lang/rust/pull/59114/
4252 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4253 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4254 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4255 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4256 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4257 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4258 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4259 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4260 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4261 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4262 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4263 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4264 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4265 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4266 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4267 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4268 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4269 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4270 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4271 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4274 Version 1.35.0 (2019-05-23)
4275 ==========================
4279 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4280 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4281 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4283 unsafe fn call_unsafe(func: unsafe fn()) {
4288 unsafe { call_unsafe(|| {}); }
4295 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4296 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4297 - [Added the `wasm32-unknown-wasi` target.][59464]
4302 - [`Thread` will now show its ID in `Debug` output.][59460]
4303 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4304 - [`alloc::System` now implements `Default`.][59451]
4305 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4307 - [`char::{ToLowercase, ToUppercase}` now
4308 implement `ExactSizeIterator`.][58778]
4309 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4310 - [Removed the `Read` trait bounds
4311 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4312 - [You can now call the `dbg!` macro without any parameters to print the file
4313 and line where it is called.][57847]
4314 - [In place ASCII case conversions are now up to 4× faster.][59283]
4315 e.g. `str::make_ascii_lowercase`
4316 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4323 - [`RefCell::replace_with`]
4324 - [`RefCell::map_split`]
4326 - [`Range::contains`]
4327 - [`RangeFrom::contains`]
4328 - [`RangeTo::contains`]
4329 - [`RangeInclusive::contains`]
4330 - [`RangeToInclusive::contains`]
4331 - [`Option::copied`]
4335 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4336 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4341 - [The Rust toolchain is now available natively for musl based distros.][58575]
4343 [59460]: https://github.com/rust-lang/rust/pull/59460/
4344 [59464]: https://github.com/rust-lang/rust/pull/59464/
4345 [59500]: https://github.com/rust-lang/rust/pull/59500/
4346 [59512]: https://github.com/rust-lang/rust/pull/59512/
4347 [59580]: https://github.com/rust-lang/rust/pull/59580/
4348 [59283]: https://github.com/rust-lang/rust/pull/59283/
4349 [59451]: https://github.com/rust-lang/rust/pull/59451/
4350 [59076]: https://github.com/rust-lang/rust/pull/59076/
4351 [58778]: https://github.com/rust-lang/rust/pull/58778/
4352 [58717]: https://github.com/rust-lang/rust/pull/58717/
4353 [58369]: https://github.com/rust-lang/rust/pull/58369/
4354 [58423]: https://github.com/rust-lang/rust/pull/58423/
4355 [58080]: https://github.com/rust-lang/rust/pull/58080/
4356 [57847]: https://github.com/rust-lang/rust/pull/57847/
4357 [58575]: https://github.com/rust-lang/rust/pull/58575
4358 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4359 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4360 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4361 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4362 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4363 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4364 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4365 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4366 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4367 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4368 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4369 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4371 Version 1.34.2 (2019-05-14)
4372 ===========================
4374 * [Destabilize the `Error::type_id` function due to a security
4375 vulnerability][60785] ([CVE-2019-12083])
4377 [60785]: https://github.com/rust-lang/rust/pull/60785
4378 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4380 Version 1.34.1 (2019-04-25)
4381 ===========================
4383 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4384 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4385 * [Fix Clippy panic when checking some macros][clippy/3805]
4387 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4388 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4389 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4391 Version 1.34.0 (2019-04-11)
4392 ==========================
4396 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4397 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4399 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4400 `#[attr{}]` procedural macros.][57367]
4401 - [You can now write `extern crate self as foo;`][57407] to import your
4402 crate's root into the extern prelude.
4407 - [You can now target `riscv64imac-unknown-none-elf` and
4408 `riscv64gc-unknown-none-elf`.][58406]
4409 - [You can now enable linker plugin LTO optimisations with
4410 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4411 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4413 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4418 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4419 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4420 the `Hash` trait to create an iterator.
4421 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4422 methods.][58421] Most notably you no longer require the `Ord` trait to create
4424 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4425 for all numeric types.][58044]
4426 - [Indexing a `str` is now generic over all types that
4427 implement `SliceIndex<str>`.][57604]
4428 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4429 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4430 produce a warning if their returning type is unused.
4431 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4432 `overflowing_pow` are now available for all numeric types.][57873] These are
4433 equivalent to methods such as `wrapping_add` for the `pow` operation.
4441 * [`Error::type_id`]
4442 * [`atomic::AtomicI16`]
4443 * [`atomic::AtomicI32`]
4444 * [`atomic::AtomicI64`]
4445 * [`atomic::AtomicI8`]
4446 * [`atomic::AtomicU16`]
4447 * [`atomic::AtomicU32`]
4448 * [`atomic::AtomicU64`]
4449 * [`atomic::AtomicU8`]
4450 * [`convert::Infallible`]
4451 * [`convert::TryFrom`]
4452 * [`convert::TryInto`]
4454 * [`iter::successors`]
4455 * [`num::NonZeroI128`]
4456 * [`num::NonZeroI16`]
4457 * [`num::NonZeroI32`]
4458 * [`num::NonZeroI64`]
4459 * [`num::NonZeroI8`]
4460 * [`num::NonZeroIsize`]
4461 * [`slice::sort_by_cached_key`]
4462 * [`str::escape_debug`]
4463 * [`str::escape_default`]
4464 * [`str::escape_unicode`]
4465 * [`str::split_ascii_whitespace`]
4468 * [`Instant::checked_add`]
4469 * [`Instant::checked_sub`]
4470 * [`SystemTime::checked_add`]
4471 * [`SystemTime::checked_sub`]
4475 - [You can now use alternative registries to crates.io.][cargo/6654]
4479 - [You can now use the `?` operator in your documentation tests without manually
4480 adding `fn main() -> Result<(), _> {}`.][56470]
4484 - [`Command::before_exec` is being replaced by the unsafe method
4485 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4486 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4487 can now use `const` functions in `static` variables.
4489 [58370]: https://github.com/rust-lang/rust/pull/58370/
4490 [58406]: https://github.com/rust-lang/rust/pull/58406/
4491 [58421]: https://github.com/rust-lang/rust/pull/58421/
4492 [58166]: https://github.com/rust-lang/rust/pull/58166/
4493 [58044]: https://github.com/rust-lang/rust/pull/58044/
4494 [58057]: https://github.com/rust-lang/rust/pull/58057/
4495 [58059]: https://github.com/rust-lang/rust/pull/58059/
4496 [57809]: https://github.com/rust-lang/rust/pull/57809/
4497 [57873]: https://github.com/rust-lang/rust/pull/57873/
4498 [57604]: https://github.com/rust-lang/rust/pull/57604/
4499 [57367]: https://github.com/rust-lang/rust/pull/57367/
4500 [57407]: https://github.com/rust-lang/rust/pull/57407/
4501 [57425]: https://github.com/rust-lang/rust/pull/57425/
4502 [57106]: https://github.com/rust-lang/rust/pull/57106/
4503 [56470]: https://github.com/rust-lang/rust/pull/56470/
4504 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4505 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4506 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4507 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4508 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4509 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4510 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4511 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4512 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4513 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4514 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4515 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4516 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4517 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4518 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4519 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4520 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4521 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4522 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4523 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4524 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4525 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4526 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4527 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4528 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4529 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4530 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4531 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4532 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4533 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4534 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4537 Version 1.33.0 (2019-02-28)
4538 ==========================
4542 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4543 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4544 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4545 E.g. You can have match statement on a `u8` that covers `0..=255` and
4546 you would no longer be required to have a `_ => unreachable!()` case.
4547 - [You can now have multiple patterns in `if let` and `while let`
4548 expressions.][57532] You can do this with the same syntax as a `match`
4558 let state = Creature::Crab("Ferris");
4560 if let Creature::Crab(name) | Creature::Person(name) = state {
4561 println!("This creature's name is: {}", name);
4565 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4566 this feature will by default produce a warning as this behaviour can be
4567 unintuitive. E.g. `if let _ = 5 {}`
4568 - [You can now use `let` bindings, assignments, expression statements,
4569 and irrefutable pattern destructuring in const functions.][57175]
4570 - [You can now call unsafe const functions.][57067] E.g.
4572 const unsafe fn foo() -> i32 { 5 }
4573 const fn bar() -> i32 {
4577 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4578 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4579 - [You can now specify a specific alignment with the `#[repr(packed)]`
4580 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4581 with an alignment of 2 bytes and a size of 6 bytes.
4582 - [You can now import an item from a module as an `_`.][56303] This allows you to
4583 import a trait's impls, and not have the name in the namespace. E.g.
4585 use std::io::Read as _;
4587 // Allowed as there is only one `Read` in the module.
4590 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4594 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4595 command line argument.][56351]
4596 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4597 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4598 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4599 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4600 information on Rust's platform support.
4601 - [Added support for the `thumbv7neon-linux-androideabi` and
4602 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4603 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4607 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4608 functions for all numeric types.][57566]
4609 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4610 are now `const` functions for all numeric types.][57105]
4611 - [The methods `is_positive` and `is_negative` are now `const` functions for
4612 all signed numeric types.][57105]
4613 - [The `get` method for all `NonZero` types is now `const`.][57167]
4614 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4615 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4616 numeric types.][57234]
4617 - [`Ipv4Addr::new` is now a `const` function][57234]
4621 - [`unix::FileExt::read_exact_at`]
4622 - [`unix::FileExt::write_all_at`]
4623 - [`Option::transpose`]
4624 - [`Result::transpose`]
4625 - [`convert::identity`]
4628 - [`marker::PhantomPinned`]
4629 - [`Vec::resize_with`]
4630 - [`VecDeque::resize_with`]
4631 - [`Duration::as_millis`]
4632 - [`Duration::as_micros`]
4633 - [`Duration::as_nanos`]
4638 - [You can now publish crates that require a feature flag to compile with
4639 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4640 - [Cargo should now rebuild a crate if a file was modified during the initial
4645 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4646 are now deprecated in the standard library, and their usage will now produce a warning.
4647 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4649 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4651 - [Libtest no longer creates a new thread for each test when
4652 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4654 [56243]: https://github.com/rust-lang/rust/pull/56243
4655 [56303]: https://github.com/rust-lang/rust/pull/56303/
4656 [56351]: https://github.com/rust-lang/rust/pull/56351/
4657 [56362]: https://github.com/rust-lang/rust/pull/56362
4658 [56642]: https://github.com/rust-lang/rust/pull/56642/
4659 [56769]: https://github.com/rust-lang/rust/pull/56769/
4660 [56805]: https://github.com/rust-lang/rust/pull/56805
4661 [56947]: https://github.com/rust-lang/rust/pull/56947/
4662 [57049]: https://github.com/rust-lang/rust/pull/57049/
4663 [57067]: https://github.com/rust-lang/rust/pull/57067/
4664 [57105]: https://github.com/rust-lang/rust/pull/57105
4665 [57130]: https://github.com/rust-lang/rust/pull/57130/
4666 [57167]: https://github.com/rust-lang/rust/pull/57167/
4667 [57175]: https://github.com/rust-lang/rust/pull/57175/
4668 [57234]: https://github.com/rust-lang/rust/pull/57234/
4669 [57332]: https://github.com/rust-lang/rust/pull/57332/
4670 [57465]: https://github.com/rust-lang/rust/pull/57465/
4671 [57532]: https://github.com/rust-lang/rust/pull/57532/
4672 [57535]: https://github.com/rust-lang/rust/pull/57535/
4673 [57566]: https://github.com/rust-lang/rust/pull/57566/
4674 [57615]: https://github.com/rust-lang/rust/pull/57615/
4675 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4676 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4677 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4678 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4679 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4680 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4681 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4682 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4683 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4684 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4685 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4686 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4687 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4688 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4689 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4690 [platform-support]: https://forge.rust-lang.org/platform-support.html
4692 Version 1.32.0 (2019-01-17)
4693 ==========================
4698 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4699 operator allows you to specify zero or one repetitions similar to the `*` and
4701 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4702 now always resolve to the item (`enum`, `struct`, etc.) available in the
4703 module if present, before resolving to a external crate or an item the prelude.][56759]
4706 enum Color { Red, Green, Blue }
4712 - [You can now match against `PhantomData<T>` types.][55837]
4713 - [You can now match against literals in macros with the `literal`
4714 specifier.][56072] This will match against a literal of any type.
4715 E.g. `1`, `'A'`, `"Hello World"`
4716 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4718 struct Point(i32, i32);
4721 pub fn new(x: i32, y: i32) -> Self {
4725 pub fn is_origin(&self) -> bool {
4733 - [Self can also now be used in type definitions.][56366] E.g.
4737 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4740 Cons(T, Box<Self>) // likewise here
4743 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4744 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4748 - [The default allocator has changed from jemalloc to the default allocator on
4749 your system.][55238] The compiler itself on Linux & macOS will still use
4750 jemalloc, but programs compiled with it will use the system allocator.
4751 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4755 - [`PathBuf` now implements `FromStr`.][55148]
4756 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4757 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4758 easily debug expressions in your rust program. E.g.
4761 let b = dbg!(a * 2) + 1;
4762 // ^-- prints: [src/main.rs:4] a * 2 = 4
4766 The following APIs are now `const` functions and can be used in a
4770 - [`UnsafeCell::get`]
4771 - [`char::is_ascii`]
4773 - [`ManuallyDrop::new`]
4774 - [`ManuallyDrop::into_inner`]
4775 - [`RangeInclusive::start`]
4776 - [`RangeInclusive::end`]
4777 - [`NonNull::as_ptr`]
4780 - [`Duration::as_secs`]
4781 - [`Duration::subsec_millis`]
4782 - [`Duration::subsec_micros`]
4783 - [`Duration::subsec_nanos`]
4785 - [`Ipv4Addr::is_unspecified`]
4787 - [`Ipv6Addr::octets`]
4791 - [`i8::to_be_bytes`]
4792 - [`i8::to_le_bytes`]
4793 - [`i8::to_ne_bytes`]
4794 - [`i8::from_be_bytes`]
4795 - [`i8::from_le_bytes`]
4796 - [`i8::from_ne_bytes`]
4797 - [`i16::to_be_bytes`]
4798 - [`i16::to_le_bytes`]
4799 - [`i16::to_ne_bytes`]
4800 - [`i16::from_be_bytes`]
4801 - [`i16::from_le_bytes`]
4802 - [`i16::from_ne_bytes`]
4803 - [`i32::to_be_bytes`]
4804 - [`i32::to_le_bytes`]
4805 - [`i32::to_ne_bytes`]
4806 - [`i32::from_be_bytes`]
4807 - [`i32::from_le_bytes`]
4808 - [`i32::from_ne_bytes`]
4809 - [`i64::to_be_bytes`]
4810 - [`i64::to_le_bytes`]
4811 - [`i64::to_ne_bytes`]
4812 - [`i64::from_be_bytes`]
4813 - [`i64::from_le_bytes`]
4814 - [`i64::from_ne_bytes`]
4815 - [`i128::to_be_bytes`]
4816 - [`i128::to_le_bytes`]
4817 - [`i128::to_ne_bytes`]
4818 - [`i128::from_be_bytes`]
4819 - [`i128::from_le_bytes`]
4820 - [`i128::from_ne_bytes`]
4821 - [`isize::to_be_bytes`]
4822 - [`isize::to_le_bytes`]
4823 - [`isize::to_ne_bytes`]
4824 - [`isize::from_be_bytes`]
4825 - [`isize::from_le_bytes`]
4826 - [`isize::from_ne_bytes`]
4827 - [`u8::to_be_bytes`]
4828 - [`u8::to_le_bytes`]
4829 - [`u8::to_ne_bytes`]
4830 - [`u8::from_be_bytes`]
4831 - [`u8::from_le_bytes`]
4832 - [`u8::from_ne_bytes`]
4833 - [`u16::to_be_bytes`]
4834 - [`u16::to_le_bytes`]
4835 - [`u16::to_ne_bytes`]
4836 - [`u16::from_be_bytes`]
4837 - [`u16::from_le_bytes`]
4838 - [`u16::from_ne_bytes`]
4839 - [`u32::to_be_bytes`]
4840 - [`u32::to_le_bytes`]
4841 - [`u32::to_ne_bytes`]
4842 - [`u32::from_be_bytes`]
4843 - [`u32::from_le_bytes`]
4844 - [`u32::from_ne_bytes`]
4845 - [`u64::to_be_bytes`]
4846 - [`u64::to_le_bytes`]
4847 - [`u64::to_ne_bytes`]
4848 - [`u64::from_be_bytes`]
4849 - [`u64::from_le_bytes`]
4850 - [`u64::from_ne_bytes`]
4851 - [`u128::to_be_bytes`]
4852 - [`u128::to_le_bytes`]
4853 - [`u128::to_ne_bytes`]
4854 - [`u128::from_be_bytes`]
4855 - [`u128::from_le_bytes`]
4856 - [`u128::from_ne_bytes`]
4857 - [`usize::to_be_bytes`]
4858 - [`usize::to_le_bytes`]
4859 - [`usize::to_ne_bytes`]
4860 - [`usize::from_be_bytes`]
4861 - [`usize::from_le_bytes`]
4862 - [`usize::from_ne_bytes`]
4866 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4867 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4871 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4875 - [The argument types for AVX's
4876 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4877 been changed from `*const` to `*mut` as the previous implementation
4881 [55148]: https://github.com/rust-lang/rust/pull/55148/
4882 [55238]: https://github.com/rust-lang/rust/pull/55238/
4883 [55280]: https://github.com/rust-lang/rust/pull/55280/
4884 [55610]: https://github.com/rust-lang/rust/pull/55610/
4885 [55663]: https://github.com/rust-lang/rust/pull/55663/
4886 [55702]: https://github.com/rust-lang/rust/pull/55702/
4887 [55837]: https://github.com/rust-lang/rust/pull/55837/
4888 [55843]: https://github.com/rust-lang/rust/pull/55843/
4889 [56072]: https://github.com/rust-lang/rust/pull/56072/
4890 [56245]: https://github.com/rust-lang/rust/pull/56245/
4891 [56365]: https://github.com/rust-lang/rust/pull/56365/
4892 [56366]: https://github.com/rust-lang/rust/pull/56366/
4893 [56395]: https://github.com/rust-lang/rust/pull/56395/
4894 [56759]: https://github.com/rust-lang/rust/pull/56759/
4895 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4896 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4897 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4898 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4899 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4900 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4901 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4902 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4903 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4904 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4905 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4906 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4907 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4908 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4909 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4910 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4911 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4912 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4913 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4914 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4915 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4916 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4917 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4918 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4919 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4920 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4921 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4922 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4923 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4924 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4925 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4926 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4927 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4928 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4929 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4930 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4931 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4932 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4933 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4934 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4935 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4936 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4937 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4938 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4939 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4940 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4941 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4942 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4943 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4944 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4945 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4946 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4947 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4948 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4949 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4950 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4951 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4952 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4953 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4954 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4955 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4956 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4957 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4958 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4959 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4960 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4961 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4962 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4963 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4964 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4965 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4966 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4967 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4968 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4969 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4970 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4971 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4972 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4973 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4974 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4975 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4976 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4977 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4978 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4979 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4980 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4981 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4982 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4983 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4984 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4985 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4986 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4987 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4990 Version 1.31.1 (2018-12-20)
4991 ===========================
4993 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4994 - [Fix broken go-to-definition in RLS][rls/1171]
4995 - [Fix infinite loop on hover in RLS][rls/1170]
4997 [56562]: https://github.com/rust-lang/rust/pull/56562
4998 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4999 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
5001 Version 1.31.0 (2018-12-06)
5002 ==========================
5006 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
5007 - [New lifetime elision rules now allow for eliding lifetimes in functions and
5008 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
5009 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
5011 - [You can now define and use `const` functions.][54835] These are currently
5012 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
5013 [language reference][const-reference] for what exactly is available.
5014 - [You can now use tool lints, which allow you to scope lints from external
5015 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
5016 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
5017 a crate, not just in exported functions.][54451]
5018 - [You can now use parentheses in pattern matches.][54497]
5022 - [Updated musl to 1.1.20][54430]
5026 - [You can now convert `num::NonZero*` types to their raw equivalents using the
5027 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
5028 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
5029 into `Option<&mut T>` using the `From` trait.][53218]
5030 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
5035 - [`slice::align_to`]
5036 - [`slice::align_to_mut`]
5037 - [`slice::chunks_exact`]
5038 - [`slice::chunks_exact_mut`]
5039 - [`slice::rchunks`]
5040 - [`slice::rchunks_mut`]
5041 - [`slice::rchunks_exact`]
5042 - [`slice::rchunks_exact_mut`]
5043 - [`Option::replace`]
5047 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
5048 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
5049 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
5051 [52813]: https://github.com/rust-lang/rust/pull/52813/
5052 [53218]: https://github.com/rust-lang/rust/pull/53218/
5053 [54057]: https://github.com/rust-lang/rust/pull/54057/
5054 [54240]: https://github.com/rust-lang/rust/pull/54240/
5055 [54430]: https://github.com/rust-lang/rust/pull/54430/
5056 [54451]: https://github.com/rust-lang/rust/pull/54451/
5057 [54497]: https://github.com/rust-lang/rust/pull/54497/
5058 [54778]: https://github.com/rust-lang/rust/pull/54778/
5059 [54835]: https://github.com/rust-lang/rust/pull/54835/
5060 [54870]: https://github.com/rust-lang/rust/pull/54870/
5061 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
5062 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
5063 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
5064 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
5065 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
5066 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
5067 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5068 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
5069 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5070 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
5071 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
5072 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
5073 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
5074 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
5076 Version 1.30.1 (2018-11-08)
5077 ===========================
5079 - [Fixed overflow ICE in rustdoc][54199]
5080 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
5082 [54199]: https://github.com/rust-lang/rust/pull/54199
5083 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
5085 Version 1.30.0 (2018-10-25)
5086 ==========================
5090 - [Procedural macros are now available.][52081] These kinds of macros allow for
5091 more powerful code generation. There is a [new chapter available][proc-macros]
5092 in the Rust Programming Language book that goes further in depth.
5093 - [You can now use keywords as identifiers using the raw identifiers
5094 syntax (`r#`),][53236] e.g. `let r#for = true;`
5095 - [Using anonymous parameters in traits is now deprecated with a warning and
5096 will be a hard error in the 2018 edition.][53272]
5097 - [You can now use `crate` in paths.][54404] This allows you to refer to the
5098 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
5099 - [Using a external crate no longer requires being prefixed with `::`.][54404]
5100 Previously, using a external crate in a module without a use statement
5101 required `let json = ::serde_json::from_str(foo);` but can now be written
5102 as `let json = serde_json::from_str(foo);`.
5103 - [You can now apply the `#[used]` attribute to static items to prevent the
5104 compiler from optimising them away, even if they appear to be unused,][51363]
5105 e.g. `#[used] static FOO: u32 = 1;`
5106 - [You can now import and reexport macros from other crates with the `use`
5107 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5108 the root module of the crate. If your macro relies on calling other local
5109 macros, it is recommended to export with the
5110 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5112 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5113 using the `vis` specifier.][53370]
5114 - [Non-macro attributes now allow all forms of literals, not just
5115 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5116 write `#[attr(true)]`.
5117 - [You can now specify a function to handle a panic in the Rust runtime with the
5118 `#[panic_handler]` attribute.][51366]
5122 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5123 - [Added the `aarch64-unknown-netbsd` target][53165]
5124 - [Upgraded to LLVM 8.][53611]
5128 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5132 - [`Ipv4Addr::BROADCAST`]
5133 - [`Ipv4Addr::LOCALHOST`]
5134 - [`Ipv4Addr::UNSPECIFIED`]
5135 - [`Ipv6Addr::LOCALHOST`]
5136 - [`Ipv6Addr::UNSPECIFIED`]
5137 - [`Iterator::find_map`]
5139 The following methods are replacement methods for `trim_left`, `trim_right`,
5140 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5142 - [`str::trim_end_matches`]
5144 - [`str::trim_start_matches`]
5145 - [`str::trim_start`]
5149 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5150 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5151 equivalent to calling `rustdoc --error-format=json`.
5152 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5156 - [`rustdoc` allows you to specify what edition to treat your code as with the
5157 `--edition` option.][54057]
5158 - [`rustdoc` now has the `--color` (specify whether to output color) and
5159 `--error-format` (specify error format, e.g. `json`) options.][53003]
5160 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5161 debug symbols.][53774]
5162 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5163 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5165 [50911]: https://github.com/rust-lang/rust/pull/50911/
5166 [51363]: https://github.com/rust-lang/rust/pull/51363/
5167 [51366]: https://github.com/rust-lang/rust/pull/51366/
5168 [52081]: https://github.com/rust-lang/rust/pull/52081/
5169 [53003]: https://github.com/rust-lang/rust/pull/53003/
5170 [53033]: https://github.com/rust-lang/rust/pull/53033/
5171 [53044]: https://github.com/rust-lang/rust/pull/53044/
5172 [53165]: https://github.com/rust-lang/rust/pull/53165/
5173 [53611]: https://github.com/rust-lang/rust/pull/53611/
5174 [53236]: https://github.com/rust-lang/rust/pull/53236/
5175 [53272]: https://github.com/rust-lang/rust/pull/53272/
5176 [53370]: https://github.com/rust-lang/rust/pull/53370/
5177 [53459]: https://github.com/rust-lang/rust/pull/53459/
5178 [53774]: https://github.com/rust-lang/rust/pull/53774/
5179 [53822]: https://github.com/rust-lang/rust/pull/53822/
5180 [54057]: https://github.com/rust-lang/rust/pull/54057/
5181 [54404]: https://github.com/rust-lang/rust/pull/54404/
5182 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5183 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5184 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5185 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5187 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5188 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5189 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5190 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5191 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5192 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5193 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5194 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5195 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5196 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5199 Version 1.29.2 (2018-10-11)
5200 ===========================
5202 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5203 - The `rls-preview` component on the windows-gnu targets has been restored.
5205 [54639]: https://github.com/rust-lang/rust/pull/54639
5208 Version 1.29.1 (2018-09-25)
5209 ===========================
5214 - The standard library's `str::repeat` function contained an out of bounds write
5215 caused by an integer overflow. This has been fixed by deterministically
5216 panicking when an overflow happens.
5218 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5222 Version 1.29.0 (2018-09-13)
5223 ==========================
5227 - [Bumped minimum LLVM version to 5.0.][51899]
5228 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5229 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5230 - [Upgraded to LLVM 7.][51966]
5234 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5235 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5236 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5237 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5239 - [`Cell<T>` now allows `T` to be unsized.][50494]
5240 - [`SocketAddr` is now stable on Redox.][52656]
5245 - [`Iterator::flatten`]
5250 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5251 `--locked` to disable this behavior.
5252 - [`cargo-install` will now allow you to cross compile an install
5253 using `--target`.][cargo/5614]
5254 - [Added the `cargo-fix` subcommand to automatically move project code from
5255 2015 edition to 2018.][cargo/5723]
5256 - [`cargo doc` can now optionally document private types using the
5257 `--document-private-items` flag.][cargo/5543]
5261 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5262 the specified level to that level.][52354] For example `--cap-lints warn`
5263 will demote `deny` and `forbid` lints to `warn`.
5264 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5265 fails and `101` if there is a panic.][52197]
5266 - [A preview of clippy has been made available through rustup.][51122]
5267 You can install the preview with `rustup component add clippy-preview`.
5271 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5272 Use `str::get_unchecked(begin..end)` instead.
5273 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5274 Consider using the `home_dir` function from
5275 https://crates.io/crates/dirs instead.
5276 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5277 - [`cfg` attributes and `--cfg` command line flags are now more
5278 strictly validated.][53893]
5280 [53893]: https://github.com/rust-lang/rust/pull/53893/
5281 [52861]: https://github.com/rust-lang/rust/pull/52861/
5282 [51966]: https://github.com/rust-lang/rust/pull/51966/
5283 [52656]: https://github.com/rust-lang/rust/pull/52656/
5284 [52239]: https://github.com/rust-lang/rust/pull/52239/
5285 [52330]: https://github.com/rust-lang/rust/pull/52330/
5286 [52354]: https://github.com/rust-lang/rust/pull/52354/
5287 [52402]: https://github.com/rust-lang/rust/pull/52402/
5288 [52197]: https://github.com/rust-lang/rust/pull/52197/
5289 [51807]: https://github.com/rust-lang/rust/pull/51807/
5290 [51899]: https://github.com/rust-lang/rust/pull/51899/
5291 [51912]: https://github.com/rust-lang/rust/pull/51912/
5292 [51619]: https://github.com/rust-lang/rust/pull/51619/
5293 [51656]: https://github.com/rust-lang/rust/pull/51656/
5294 [51178]: https://github.com/rust-lang/rust/pull/51178/
5295 [51122]: https://github.com/rust-lang/rust/pull/51122
5296 [50494]: https://github.com/rust-lang/rust/pull/50494/
5297 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5298 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5299 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5300 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5301 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5302 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5303 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5306 Version 1.28.0 (2018-08-02)
5307 ===========================
5311 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5312 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5313 the inner type across Foreign Function Interface (FFI) boundaries.
5314 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5315 and can now be used as identifiers.][51196]
5316 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5317 stable.][51241] This will allow users to specify a global allocator for
5319 - [Unit test functions marked with the `#[test]` attribute can now return
5320 `Result<(), E: Debug>` in addition to `()`.][51298]
5321 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5322 allows macros to easily target lifetimes.
5326 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5327 prioritise making smaller binary sizes. `z` is the same as `s` with the
5328 exception that it does not vectorise loops, which typically results in an even
5330 - [The short error format is now stable.][49546] Specified with
5331 `--error-format=short` this option will provide a more compressed output of
5332 rust error messages.
5333 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5334 - [Reduced the number of allocations in the macro parser.][50855] This can
5335 improve compile times of macro heavy crates on average by 5%.
5339 - [Implemented `Default` for `&mut str`.][51306]
5340 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5341 - [Implemented `Extend` for `()`.][50234]
5342 - [The `Debug` implementation of `time::Duration` should now be more easily
5343 human readable.][50364] Previously a `Duration` of one second would printed as
5344 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5345 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5346 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5347 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5348 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5349 for `PathBuf`.][50170]
5350 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5351 and `Wrapping<i128>`.][50465]
5352 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5353 possible.][51050] This can provide up to a 40% speed increase.
5354 - [Improved error messages when using `format!`.][50610]
5358 - [`Iterator::step_by`]
5359 - [`Path::ancestors`]
5360 - [`SystemTime::UNIX_EPOCH`]
5361 - [`alloc::GlobalAlloc`]
5363 - [`alloc::LayoutErr`]
5366 - [`alloc::alloc_zeroed`]
5367 - [`alloc::dealloc`]
5368 - [`alloc::realloc`]
5369 - [`alloc::handle_alloc_error`]
5370 - [`btree_map::Entry::or_default`]
5371 - [`fmt::Alignment`]
5372 - [`hash_map::Entry::or_default`]
5373 - [`iter::repeat_with`]
5374 - [`num::NonZeroUsize`]
5375 - [`num::NonZeroU128`]
5376 - [`num::NonZeroU16`]
5377 - [`num::NonZeroU32`]
5378 - [`num::NonZeroU64`]
5379 - [`num::NonZeroU8`]
5380 - [`ops::RangeBounds`]
5381 - [`slice::SliceIndex`]
5382 - [`slice::from_mut`]
5383 - [`slice::from_ref`]
5384 - [`{Any + Send + Sync}::downcast_mut`]
5385 - [`{Any + Send + Sync}::downcast_ref`]
5386 - [`{Any + Send + Sync}::is`]
5390 - [Cargo will now no longer allow you to publish crates with build scripts that
5391 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5392 considered to be immutable.
5396 - [The `suggestion_applicability` field in `rustc`'s json output is now
5397 stable.][50486] This will allow dev tools to check whether a code suggestion
5398 would apply to them.
5402 - [Rust will consider trait objects with duplicated constraints to be the same
5403 type as without the duplicated constraint.][51276] For example the below code will
5404 now fail to compile.
5409 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5412 impl Trait + Send + Send {
5413 fn test(&self) { println!("two"); }
5417 [49546]: https://github.com/rust-lang/rust/pull/49546/
5418 [50143]: https://github.com/rust-lang/rust/pull/50143/
5419 [50170]: https://github.com/rust-lang/rust/pull/50170/
5420 [50234]: https://github.com/rust-lang/rust/pull/50234/
5421 [50265]: https://github.com/rust-lang/rust/pull/50265/
5422 [50364]: https://github.com/rust-lang/rust/pull/50364/
5423 [50385]: https://github.com/rust-lang/rust/pull/50385/
5424 [50465]: https://github.com/rust-lang/rust/pull/50465/
5425 [50486]: https://github.com/rust-lang/rust/pull/50486/
5426 [50554]: https://github.com/rust-lang/rust/pull/50554/
5427 [50610]: https://github.com/rust-lang/rust/pull/50610/
5428 [50855]: https://github.com/rust-lang/rust/pull/50855/
5429 [51050]: https://github.com/rust-lang/rust/pull/51050/
5430 [51196]: https://github.com/rust-lang/rust/pull/51196/
5431 [51241]: https://github.com/rust-lang/rust/pull/51241/
5432 [51276]: https://github.com/rust-lang/rust/pull/51276/
5433 [51298]: https://github.com/rust-lang/rust/pull/51298/
5434 [51306]: https://github.com/rust-lang/rust/pull/51306/
5435 [51562]: https://github.com/rust-lang/rust/pull/51562/
5436 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5437 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5438 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5439 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5440 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5441 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5442 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5443 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5444 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5445 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5446 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5447 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5448 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5449 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5450 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5451 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5452 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5453 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5454 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5455 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5456 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5457 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5458 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5459 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5460 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5461 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5462 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5463 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5464 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5465 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5467 Version 1.27.2 (2018-07-20)
5468 ===========================
5473 - The borrow checker was fixed to avoid potential unsoundness when using
5474 match ergonomics: [#52213][52213].
5476 [52213]: https://github.com/rust-lang/rust/issues/52213
5478 Version 1.27.1 (2018-07-10)
5479 ===========================
5484 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5485 when running, which enabled executing code as some other user on a
5486 given machine. This release fixes that vulnerability; you can read
5487 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5489 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5494 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5495 match ergonomics: [#51415][51415], [#49534][49534].
5497 [51415]: https://github.com/rust-lang/rust/issues/51415
5498 [49534]: https://github.com/rust-lang/rust/issues/49534
5499 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5500 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5502 Version 1.27.0 (2018-06-21)
5503 ==========================
5507 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5508 be used as an identifier.
5509 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5510 bare `Trait` syntax, and should make it clearer when being used in tandem with
5511 `impl Trait` because it is equivalent to the following syntax:
5512 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5513 `Box<Trait> == Box<dyn Trait>`.
5514 - [Attributes on generic parameters such as types and lifetimes are
5515 now stable.][48851] e.g.
5516 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5517 - [The `#[must_use]` attribute can now also be used on functions as well as
5518 types.][48925] It provides a lint that by default warns users when the
5519 value returned by a function has not been used.
5523 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5527 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5528 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5529 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5530 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5531 the `cfg` attribute.
5532 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5533 std are now available in core.][49896]
5534 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5536 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5537 that the operation isn't done in place.
5538 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5539 the `#[must_use]` attribute][49533] to warn about unused potentially
5540 expensive allocations.
5544 - [`DoubleEndedIterator::rfind`]
5545 - [`DoubleEndedIterator::rfold`]
5546 - [`DoubleEndedIterator::try_rfold`]
5547 - [`Duration::from_micros`]
5548 - [`Duration::from_nanos`]
5549 - [`Duration::subsec_micros`]
5550 - [`Duration::subsec_millis`]
5551 - [`HashMap::remove_entry`]
5552 - [`Iterator::try_fold`]
5553 - [`Iterator::try_for_each`]
5555 - [`Option::filter`]
5556 - [`String::replace_range`]
5557 - [`Take::set_limit`]
5558 - [`hint::unreachable_unchecked`]
5559 - [`os::unix::process::parent_id`]
5560 - [`ptr::swap_nonoverlapping`]
5561 - [`slice::rsplit_mut`]
5563 - [`slice::swap_with_slice`]
5567 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5568 `readme`, and `repository` fields.][cargo/5386]
5569 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5570 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5571 a different directory than `target` for placing compilation artifacts.
5572 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5573 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5574 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5575 where cargo would infer a binary, Cargo will produce a warning. You can
5576 disable this feature ahead of time by setting any of the following to false:
5577 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5578 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5579 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5583 - [Added “The Rustc book” into the official documentation.][49707]
5584 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5585 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5589 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5590 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5591 compile, `"".is_empty()` will still compile.
5592 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5593 will only print the inner type.][48553] E.g.
5594 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5595 not `AtomicBool(true)`.
5596 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5597 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5598 alignment should cover all use cases.
5599 - The `.description()` method on the `std::error::Error` trait
5600 [has been soft-deprecated][50163]. It is no longer required to implement it.
5602 [48553]: https://github.com/rust-lang/rust/pull/48553/
5603 [48851]: https://github.com/rust-lang/rust/pull/48851/
5604 [48925]: https://github.com/rust-lang/rust/pull/48925/
5605 [49533]: https://github.com/rust-lang/rust/pull/49533/
5606 [49623]: https://github.com/rust-lang/rust/pull/49623/
5607 [49630]: https://github.com/rust-lang/rust/pull/49630/
5608 [49664]: https://github.com/rust-lang/rust/pull/49664/
5609 [49699]: https://github.com/rust-lang/rust/pull/49699/
5610 [49707]: https://github.com/rust-lang/rust/pull/49707/
5611 [49896]: https://github.com/rust-lang/rust/pull/49896/
5612 [49968]: https://github.com/rust-lang/rust/pull/49968/
5613 [50163]: https://github.com/rust-lang/rust/pull/50163
5614 [50177]: https://github.com/rust-lang/rust/pull/50177/
5615 [50378]: https://github.com/rust-lang/rust/pull/50378/
5616 [50423]: https://github.com/rust-lang/rust/pull/50423/
5617 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5618 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5619 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5620 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5621 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5622 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5623 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5624 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5625 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5626 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5627 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5628 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5629 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5630 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5631 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5632 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5633 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5634 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5635 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5636 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5637 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5638 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5639 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5640 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5641 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5642 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5643 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5644 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5645 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5648 Version 1.26.2 (2018-06-05)
5649 ==========================
5654 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5656 [51117]: https://github.com/rust-lang/rust/issues/51117
5659 Version 1.26.1 (2018-05-29)
5660 ==========================
5665 - [RLS now works on Windows.][50646]
5666 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5672 - [`fn main() -> impl Trait` no longer works for non-Termination
5674 This reverts an accidental stabilization.
5675 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5676 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5678 [50646]: https://github.com/rust-lang/rust/issues/50646
5679 [50656]: https://github.com/rust-lang/rust/pull/50656
5680 [50812]: https://github.com/rust-lang/rust/pull/50812
5681 [50950]: https://github.com/rust-lang/rust/issues/50950
5682 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5684 Version 1.26.0 (2018-05-10)
5685 ==========================
5689 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5690 implement either or both traits.][49299]
5691 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5692 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5693 lifetime can be elided.][49458]
5694 - [`impl Trait` is now stable allowing you to have abstract types in returns
5695 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5696 `fn open(path: impl AsRef<Path>)`.
5697 - [Pattern matching will now automatically apply dereferences.][49394]
5698 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5699 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5700 - [A lot of operations are now available in a const context.][46882] E.g. You
5701 can now index into constant arrays, reference and dereference into constants,
5702 and use tuple struct constructors.
5703 - [Fixed entry slice patterns are now stable.][48516] E.g.
5705 let points = [1, 2, 3, 4];
5707 [1, 2, 3, 4] => println!("All points were sequential."),
5708 _ => println!("Not all points were sequential."),
5715 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5716 - [Fixed exponential projection complexity on nested types.][48296]
5717 This can provide up to a ~12% reduction in compile times for certain crates.
5718 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5719 to remap path prefixes outputted by the compiler.
5720 - [Added `powerpc-unknown-netbsd` target.][48281]
5724 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5725 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5726 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5727 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5728 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5729 - [`ascii::escape_default` is now available in libcore.][48735]
5730 - [Trailing commas are now supported in std and core macros.][48056]
5731 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5732 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5737 - [`*const T::copy_to_nonoverlapping`]
5738 - [`*const T::copy_to`]
5739 - [`*const T::read_unaligned`]
5740 - [`*const T::read_volatile`]
5741 - [`*const T::read`]
5743 - [`*const T::wrapping_add`]
5744 - [`*const T::wrapping_sub`]
5746 - [`*mut T::copy_to_nonoverlapping`]
5747 - [`*mut T::copy_to`]
5748 - [`*mut T::read_unaligned`]
5749 - [`*mut T::read_volatile`]
5751 - [`*mut T::replace`]
5754 - [`*mut T::wrapping_add`]
5755 - [`*mut T::wrapping_sub`]
5756 - [`*mut T::write_bytes`]
5757 - [`*mut T::write_unaligned`]
5758 - [`*mut T::write_volatile`]
5761 - [`FromUtf8Error::as_bytes`]
5762 - [`LocalKey::try_with`]
5763 - [`Option::cloned`]
5764 - [`btree_map::Entry::and_modify`]
5765 - [`fs::read_to_string`]
5768 - [`hash_map::Entry::and_modify`]
5769 - [`iter::FusedIterator`]
5770 - [`ops::RangeInclusive`]
5771 - [`ops::RangeToInclusive`]
5773 - [`slice::rotate_left`]
5774 - [`slice::rotate_right`]
5775 - [`String::retain`]
5780 - [Cargo will now output path to custom commands when `-v` is
5781 passed with `--list`][cargo/5041]
5782 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5786 - [The second edition of "The Rust Programming Language" book is now recommended
5787 over the first.][48404]
5792 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5793 syntax is now invalid.
5795 use std::ops::Fn as dyn;
5796 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5798 - [The result of dereferences are no longer promoted to `'static`.][47408]
5802 const PAIR: &(i32, i32) = &(0, 1);
5803 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5806 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5807 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5809 - [Removed hoedown from rustdoc.][48274]
5810 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5812 [46882]: https://github.com/rust-lang/rust/pull/46882
5813 [47379]: https://github.com/rust-lang/rust/pull/47379
5814 [47408]: https://github.com/rust-lang/rust/pull/47408
5815 [47813]: https://github.com/rust-lang/rust/pull/47813
5816 [48056]: https://github.com/rust-lang/rust/pull/48056
5817 [48125]: https://github.com/rust-lang/rust/pull/48125
5818 [48235]: https://github.com/rust-lang/rust/pull/48235
5819 [48274]: https://github.com/rust-lang/rust/pull/48274
5820 [48281]: https://github.com/rust-lang/rust/pull/48281
5821 [48296]: https://github.com/rust-lang/rust/pull/48296
5822 [48326]: https://github.com/rust-lang/rust/pull/48326
5823 [48359]: https://github.com/rust-lang/rust/pull/48359
5824 [48404]: https://github.com/rust-lang/rust/pull/48404
5825 [48481]: https://github.com/rust-lang/rust/pull/48481
5826 [48516]: https://github.com/rust-lang/rust/pull/48516
5827 [48628]: https://github.com/rust-lang/rust/pull/48628
5828 [48629]: https://github.com/rust-lang/rust/pull/48629
5829 [48657]: https://github.com/rust-lang/rust/pull/48657
5830 [48735]: https://github.com/rust-lang/rust/pull/48735
5831 [48978]: https://github.com/rust-lang/rust/pull/48978
5832 [49101]: https://github.com/rust-lang/rust/pull/49101
5833 [49109]: https://github.com/rust-lang/rust/pull/49109
5834 [49162]: https://github.com/rust-lang/rust/pull/49162
5835 [49255]: https://github.com/rust-lang/rust/pull/49255
5836 [49299]: https://github.com/rust-lang/rust/pull/49299
5837 [49305]: https://github.com/rust-lang/rust/pull/49305
5838 [49394]: https://github.com/rust-lang/rust/pull/49394
5839 [49458]: https://github.com/rust-lang/rust/pull/49458
5840 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5841 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5842 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5843 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5844 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5845 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5846 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5847 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5848 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5849 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5850 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5851 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5852 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5853 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5854 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5855 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5856 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5857 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5858 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5859 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5860 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5861 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5862 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5863 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5864 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5865 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5866 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5867 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5868 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5869 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5870 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5871 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5872 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5873 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5874 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5875 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5876 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5877 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5878 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5879 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5880 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5881 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5884 Version 1.25.0 (2018-03-29)
5885 ==========================
5889 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5890 - [You can now use nested groups of imports.][47948]
5891 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5892 - [You can now have `|` at the start of a match arm.][47947] e.g.
5894 enum Foo { A, B, C }
5900 | Foo::B => println!("AB"),
5901 | Foo::C => println!("C"),
5908 - [Upgraded to LLVM 6.][47828]
5909 - [Added `-C lto=val` option.][47521]
5910 - [Added `i586-unknown-linux-musl` target][47282]
5914 - [Impl Send for `process::Command` on Unix.][47760]
5915 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5916 - [`UnsafeCell::into_inner` is now safe.][47204]
5917 - [Implement libstd for CloudABI.][47268]
5918 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5919 - [Implement `AsRef<Path>` for Component][46985]
5920 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5921 - [Moved `Duration` to libcore.][46666]
5925 - [`Location::column`]
5928 The following functions can now be used in a constant expression.
5929 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5930 - [`Duration::new`][47300]
5931 - [`Duration::from_secs`][47300]
5932 - [`Duration::from_millis`][47300]
5936 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5937 - [`cargo new` now defaults to creating a binary crate, instead of a
5938 library crate.][cargo/5029]
5942 - [Rust by example is now shipped with new releases][46196]
5946 - [Deprecated `net::lookup_host`.][47510]
5947 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5948 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5949 around indexing operations (see [#47349][47349]). This has been fixed (which also
5950 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5951 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5953 [33903]: https://github.com/rust-lang/rust/pull/33903
5954 [47947]: https://github.com/rust-lang/rust/pull/47947
5955 [47948]: https://github.com/rust-lang/rust/pull/47948
5956 [47760]: https://github.com/rust-lang/rust/pull/47760
5957 [47790]: https://github.com/rust-lang/rust/pull/47790
5958 [47828]: https://github.com/rust-lang/rust/pull/47828
5959 [47398]: https://github.com/rust-lang/rust/pull/47398
5960 [47510]: https://github.com/rust-lang/rust/pull/47510
5961 [47521]: https://github.com/rust-lang/rust/pull/47521
5962 [47204]: https://github.com/rust-lang/rust/pull/47204
5963 [47251]: https://github.com/rust-lang/rust/pull/47251
5964 [47268]: https://github.com/rust-lang/rust/pull/47268
5965 [47282]: https://github.com/rust-lang/rust/pull/47282
5966 [47300]: https://github.com/rust-lang/rust/pull/47300
5967 [47349]: https://github.com/rust-lang/rust/pull/47349
5968 [46931]: https://github.com/rust-lang/rust/pull/46931
5969 [46985]: https://github.com/rust-lang/rust/pull/46985
5970 [47006]: https://github.com/rust-lang/rust/pull/47006
5971 [46830]: https://github.com/rust-lang/rust/pull/46830
5972 [46095]: https://github.com/rust-lang/rust/pull/46095
5973 [46666]: https://github.com/rust-lang/rust/pull/46666
5974 [46196]: https://github.com/rust-lang/rust/pull/46196
5975 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5976 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5977 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5978 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5979 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5982 Version 1.24.1 (2018-03-01)
5983 ==========================
5985 - [Do not abort when unwinding through FFI][48251]
5986 - [Emit UTF-16 files for linker arguments on Windows][48318]
5987 - [Make the error index generator work again][48308]
5988 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5990 [48251]: https://github.com/rust-lang/rust/issues/48251
5991 [48308]: https://github.com/rust-lang/rust/issues/48308
5992 [48318]: https://github.com/rust-lang/rust/issues/48318
5993 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5996 Version 1.24.0 (2018-02-15)
5997 ==========================
6001 - [External `sysv64` ffi is now available.][46528]
6002 eg. `extern "sysv64" fn foo () {}`
6006 - [rustc now uses 16 codegen units by default for release builds.][46910]
6007 For the fastest builds, utilize `codegen-units=1`.
6008 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
6009 - [Add `aarch64-unknown-openbsd` support][46760]
6013 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
6014 improvement in performance in the majority of cases.
6015 - [`OsStr`'s `Debug` implementation is now lossless and consistent
6016 with Windows.][46798]
6017 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
6018 - [impl `From<bool>` for `AtomicBool`][46293]
6019 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
6020 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
6021 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
6022 - [float::from_bits now just uses transmute.][46012] This provides
6023 some optimisations from LLVM.
6024 - [Copied `AsciiExt` methods onto `char`][46077]
6025 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
6026 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
6027 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
6028 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
6032 - [`RefCell::replace`]
6034 - [`atomic::spin_loop_hint`]
6036 The following functions can now be used in a constant expression.
6037 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
6039 - [`AtomicBool::new`][46287]
6040 - [`AtomicUsize::new`][46287]
6041 - [`AtomicIsize::new`][46287]
6042 - [`AtomicPtr::new`][46287]
6043 - [`Cell::new`][46287]
6044 - [`{integer}::min_value`][46287]
6045 - [`{integer}::max_value`][46287]
6046 - [`mem::size_of`][46287]
6047 - [`mem::align_of`][46287]
6048 - [`ptr::null`][46287]
6049 - [`ptr::null_mut`][46287]
6050 - [`RefCell::new`][46287]
6051 - [`UnsafeCell::new`][46287]
6055 - [Added a `workspace.default-members` config that
6056 overrides implied `--all` in virtual workspaces.][cargo/4743]
6057 - [Enable incremental by default on development builds.][cargo/4817] Also added
6058 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
6059 per-project or global basis respectively.
6066 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
6067 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
6068 in accordance with IETF RFC 4291 §2.2.
6069 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
6070 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
6071 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
6072 - [Leading zeros in tuple struct members is now an error][47084]
6073 - [`column!()` macro is one-based instead of zero-based][46977]
6074 - [`fmt::Arguments` can no longer be shared across threads][45198]
6075 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
6076 - [Cargo sets a different working directory for the compiler][cargo/4788]
6078 [44884]: https://github.com/rust-lang/rust/pull/44884
6079 [45198]: https://github.com/rust-lang/rust/pull/45198
6080 [45506]: https://github.com/rust-lang/rust/pull/45506
6081 [45990]: https://github.com/rust-lang/rust/pull/45990
6082 [46012]: https://github.com/rust-lang/rust/pull/46012
6083 [46077]: https://github.com/rust-lang/rust/pull/46077
6084 [46094]: https://github.com/rust-lang/rust/pull/46094
6085 [46284]: https://github.com/rust-lang/rust/pull/46284
6086 [46287]: https://github.com/rust-lang/rust/pull/46287
6087 [46293]: https://github.com/rust-lang/rust/pull/46293
6088 [46528]: https://github.com/rust-lang/rust/pull/46528
6089 [46671]: https://github.com/rust-lang/rust/pull/46671
6090 [46713]: https://github.com/rust-lang/rust/pull/46713
6091 [46735]: https://github.com/rust-lang/rust/pull/46735
6092 [46760]: https://github.com/rust-lang/rust/pull/46760
6093 [46798]: https://github.com/rust-lang/rust/pull/46798
6094 [46828]: https://github.com/rust-lang/rust/pull/46828
6095 [46831]: https://github.com/rust-lang/rust/pull/46831
6096 [46833]: https://github.com/rust-lang/rust/pull/46833
6097 [46910]: https://github.com/rust-lang/rust/pull/46910
6098 [46977]: https://github.com/rust-lang/rust/pull/46977
6099 [47018]: https://github.com/rust-lang/rust/pull/47018
6100 [47080]: https://github.com/rust-lang/rust/pull/47080
6101 [47084]: https://github.com/rust-lang/rust/pull/47084
6102 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6103 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6104 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6105 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6106 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6107 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6110 Version 1.23.0 (2018-01-04)
6111 ==========================
6115 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6116 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6117 Which should fix some confusing errors in some operations.
6121 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6122 undefined behavior.][45920]
6123 - [rustc now suggests renaming import if names clash.][45660]
6124 - [Display errors/warnings correctly when there are zero-width or
6125 wide characters.][45711]
6126 - [rustc now avoids unnecessary copies of arguments that are
6127 simple bindings][45380] This should improve memory usage on average by 5-10%.
6128 - [Updated musl used to build musl rustc to 1.1.17][45393]
6132 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6133 - [Implement Hash for raw pointers to unsized types][45483]
6134 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6135 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6136 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6137 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6138 and `<*mut T>::as_mut`][44932]
6139 - [Optimized `Thread::{park, unpark}` implementation][45524]
6140 - [Improved `SliceExt::binary_search` performance.][45333]
6141 - [impl `FromIterator<()>` for `()`][45379]
6142 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6150 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6151 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6152 - [Added unit test checking to `cargo check`][cargo/4592]
6153 - [Cargo now lets you install a specific version
6154 using `cargo install --version`][cargo/4637]
6158 - [Releases now ship with the Cargo book documentation.][45692]
6159 - [rustdoc now prints rendering warnings on every run.][45324]
6163 - [Changes have been made to type equality to make it more correct,
6164 in rare cases this could break some code.][45853] [Tracking issue for
6165 further information][45852]
6166 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6167 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6168 Android 9, the minimum supported version is Android 14.
6169 - [Bumped the minimum LLVM to 3.9][45326]
6171 [44042]: https://github.com/rust-lang/rust/pull/44042
6172 [44932]: https://github.com/rust-lang/rust/pull/44932
6173 [45267]: https://github.com/rust-lang/rust/pull/45267
6174 [45324]: https://github.com/rust-lang/rust/pull/45324
6175 [45326]: https://github.com/rust-lang/rust/pull/45326
6176 [45333]: https://github.com/rust-lang/rust/pull/45333
6177 [45379]: https://github.com/rust-lang/rust/pull/45379
6178 [45380]: https://github.com/rust-lang/rust/pull/45380
6179 [45393]: https://github.com/rust-lang/rust/pull/45393
6180 [45435]: https://github.com/rust-lang/rust/pull/45435
6181 [45483]: https://github.com/rust-lang/rust/pull/45483
6182 [45524]: https://github.com/rust-lang/rust/pull/45524
6183 [45571]: https://github.com/rust-lang/rust/pull/45571
6184 [45580]: https://github.com/rust-lang/rust/pull/45580
6185 [45610]: https://github.com/rust-lang/rust/pull/45610
6186 [45660]: https://github.com/rust-lang/rust/pull/45660
6187 [45692]: https://github.com/rust-lang/rust/pull/45692
6188 [45711]: https://github.com/rust-lang/rust/pull/45711
6189 [45772]: https://github.com/rust-lang/rust/pull/45772
6190 [45852]: https://github.com/rust-lang/rust/issues/45852
6191 [45853]: https://github.com/rust-lang/rust/pull/45853
6192 [45887]: https://github.com/rust-lang/rust/pull/45887
6193 [45920]: https://github.com/rust-lang/rust/pull/45920
6194 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6195 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6196 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6199 Version 1.22.1 (2017-11-22)
6200 ==========================
6202 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6204 [46183]: https://github.com/rust-lang/rust/pull/46183
6206 Version 1.22.0 (2017-11-22)
6207 ==========================
6211 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6212 - [Now accepts underscores in unicode escapes][43716]
6213 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6214 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6218 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6219 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6220 This should decrease compile times for debug builds.
6221 - [strict memory alignment now enabled on ARMv6][45094]
6222 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6226 - [Allow atomic operations up to 32 bits
6227 on `armv5te_unknown_linux_gnueabi`][44978]
6228 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6229 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6230 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6231 - [Properly detect overflow in `Instant += Duration`.][44220]
6232 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6233 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6234 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6241 - [Cargo will now build multi file examples in subdirectories of the `examples`
6242 folder that have a `main.rs` file.][cargo/4496]
6243 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6244 the old format will continue to work and can be updated with `cargo update`.
6245 - [Now supports vendoring git repositories][cargo/3992]
6249 - [`libbacktrace` is now available on Apple platforms.][44251]
6250 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6251 This now lets you specify that a given code example will fail to compile.
6255 - [The minimum Android version that rustc can build for has been bumped
6256 to `4.0` from `2.3`][45656]
6257 - [Allowing `T op= &T` for numeric types has broken some type
6258 inference cases][45480]
6261 [42526]: https://github.com/rust-lang/rust/pull/42526
6262 [43716]: https://github.com/rust-lang/rust/pull/43716
6263 [43949]: https://github.com/rust-lang/rust/pull/43949
6264 [44015]: https://github.com/rust-lang/rust/pull/44015
6265 [44220]: https://github.com/rust-lang/rust/pull/44220
6266 [44251]: https://github.com/rust-lang/rust/pull/44251
6267 [44287]: https://github.com/rust-lang/rust/pull/44287
6268 [44303]: https://github.com/rust-lang/rust/pull/44303
6269 [44456]: https://github.com/rust-lang/rust/pull/44456
6270 [44466]: https://github.com/rust-lang/rust/pull/44466
6271 [44895]: https://github.com/rust-lang/rust/pull/44895
6272 [44966]: https://github.com/rust-lang/rust/pull/44966
6273 [44978]: https://github.com/rust-lang/rust/pull/44978
6274 [45041]: https://github.com/rust-lang/rust/pull/45041
6275 [45064]: https://github.com/rust-lang/rust/pull/45064
6276 [45075]: https://github.com/rust-lang/rust/pull/45075
6277 [45094]: https://github.com/rust-lang/rust/pull/45094
6278 [45095]: https://github.com/rust-lang/rust/pull/45095
6279 [45480]: https://github.com/rust-lang/rust/issues/45480
6280 [45656]: https://github.com/rust-lang/rust/pull/45656
6281 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6282 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6283 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6290 Version 1.21.0 (2017-10-12)
6291 ==========================
6295 - [You can now use static references for literals.][43838]
6299 let x: &'static u32 = &0;
6302 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6305 my_macro!(Vec<i32>::new); // Always worked
6306 my_macro!(Vec::<i32>::new); // Now works
6311 - [Upgraded jemalloc to 4.5.0][43911]
6312 - [Enabled unwinding panics on Redox][43917]
6313 - [Now runs LLVM in parallel during translation phase.][43506]
6314 This should reduce peak memory usage.
6318 - [Generate builtin impls for `Clone` for all arrays and tuples that
6319 are `T: Clone`][43690]
6320 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6321 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6322 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6327 [`std::mem::discriminant`]
6331 - [You can now call `cargo install` with multiple package names][cargo/4216]
6332 - [Cargo commands inside a virtual workspace will now implicitly
6333 pass `--all`][cargo/4335]
6334 - [Added a `[patch]` section to `Cargo.toml` to handle
6335 prepublication dependencies][cargo/4123] [RFC 1969]
6336 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6337 like patterns][cargo/4270]
6338 - [Added the `--all-targets` option][cargo/4400]
6339 - [Using required dependencies as a feature is now deprecated and emits
6340 a warning][cargo/4364]
6345 - [Cargo docs are moving][43916]
6346 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6347 - [The rustdoc book is now available][43863]
6348 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6349 - [Added a preview of RLS has been made available through rustup][44204]
6350 Install with `rustup component add rls-preview`
6351 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6352 Previously only showed `std::os::unix`.
6356 - [Changes in method matching against higher-ranked types][43880] This may cause
6357 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6358 - [rustc's JSON error output's byte position start at top of file.][42973]
6359 Was previously relative to the rustc's internal `CodeMap` struct which
6360 required the unstable library `libsyntax` to correctly use.
6361 - [`unused_results` lint no longer ignores booleans][43728]
6363 [42565]: https://github.com/rust-lang/rust/pull/42565
6364 [42973]: https://github.com/rust-lang/rust/pull/42973
6365 [43348]: https://github.com/rust-lang/rust/pull/43348
6366 [43459]: https://github.com/rust-lang/rust/pull/43459
6367 [43506]: https://github.com/rust-lang/rust/pull/43506
6368 [43540]: https://github.com/rust-lang/rust/pull/43540
6369 [43690]: https://github.com/rust-lang/rust/pull/43690
6370 [43728]: https://github.com/rust-lang/rust/pull/43728
6371 [43838]: https://github.com/rust-lang/rust/pull/43838
6372 [43863]: https://github.com/rust-lang/rust/pull/43863
6373 [43880]: https://github.com/rust-lang/rust/pull/43880
6374 [43911]: https://github.com/rust-lang/rust/pull/43911
6375 [43916]: https://github.com/rust-lang/rust/pull/43916
6376 [43917]: https://github.com/rust-lang/rust/pull/43917
6377 [44204]: https://github.com/rust-lang/rust/pull/44204
6378 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6379 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6380 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6381 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6382 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6383 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6384 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6385 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6386 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6388 Version 1.20.0 (2017-08-31)
6389 ===========================
6393 - [Associated constants are now stabilised.][42809]
6394 - [A lot of macro bugs are now fixed.][42913]
6399 - [Struct fields are now properly coerced to the expected field type.][42807]
6400 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6401 `wasm32-experimental-emscripten` target.
6402 - [Changed some of the error messages to be more helpful.][42033]
6403 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6405 - [rustc now reports the total number of errors on compilation failure][43015]
6406 previously this was only the number of errors in the pass that failed.
6407 - [Expansion in rustc has been sped up 29x.][42533]
6408 - [added `msp430-none-elf` target.][43099]
6409 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6411 - [Fixes backtraces on Redox][43228]
6412 - [rustc now identifies different versions of same crate when absolute paths of
6413 different types match in an error message.][42826]
6419 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6420 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6422 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6423 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6424 - [Impl `Clone` for `DefaultHasher`.][42799]
6425 - [Impl `Sync` for `SyncSender`.][42397]
6426 - [Impl `FromStr` for `char`][42271]
6427 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6429 - [allow messages in the `unimplemented!()` macro.][42155]
6430 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6431 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6432 - [Upgrade to Unicode 10.0.0][42999]
6433 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6434 - [Skip the main thread's manual stack guard on Linux][43072]
6435 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6436 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6438 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6443 - [`CStr::into_c_string`]
6444 - [`CString::as_c_str`]
6445 - [`CString::into_boxed_c_str`]
6446 - [`Chain::get_mut`]
6447 - [`Chain::get_ref`]
6448 - [`Chain::into_inner`]
6449 - [`Option::get_or_insert_with`]
6450 - [`Option::get_or_insert`]
6451 - [`OsStr::into_os_string`]
6452 - [`OsString::into_boxed_os_str`]
6455 - [`Utf8Error::error_len`]
6456 - [`char::EscapeDebug`]
6457 - [`char::escape_debug`]
6458 - [`compile_error!`]
6459 - [`f32::from_bits`]
6461 - [`f64::from_bits`]
6463 - [`mem::ManuallyDrop`]
6464 - [`slice::sort_unstable_by_key`]
6465 - [`slice::sort_unstable_by`]
6466 - [`slice::sort_unstable`]
6467 - [`str::from_boxed_utf8_unchecked`]
6468 - [`str::as_bytes_mut`]
6469 - [`str::as_bytes_mut`]
6470 - [`str::from_utf8_mut`]
6471 - [`str::from_utf8_unchecked_mut`]
6473 - [`str::get_unchecked_mut`]
6474 - [`str::get_unchecked`]
6476 - [`str::into_boxed_bytes`]
6481 - [Cargo API token location moved from `~/.cargo/config` to
6482 `~/.cargo/credentials`.][cargo/3978]
6483 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6484 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6485 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6486 - [You can now specify version of a binary when installed through
6487 `cargo install` using `--vers`.][cargo/4229]
6488 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6489 failure.][cargo/4248]
6490 - [Changed the convention around which file is the crate root.][cargo/4259]
6495 - [Functions with `'static` in their return types will now not be as usable as
6496 if they were using lifetime parameters instead.][42417]
6497 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6498 takes the sign of NaN into account where previously didn't.][42430]
6500 [42033]: https://github.com/rust-lang/rust/pull/42033
6501 [42155]: https://github.com/rust-lang/rust/pull/42155
6502 [42271]: https://github.com/rust-lang/rust/pull/42271
6503 [42397]: https://github.com/rust-lang/rust/pull/42397
6504 [42417]: https://github.com/rust-lang/rust/pull/42417
6505 [42430]: https://github.com/rust-lang/rust/pull/42430
6506 [42431]: https://github.com/rust-lang/rust/pull/42431
6507 [42533]: https://github.com/rust-lang/rust/pull/42533
6508 [42571]: https://github.com/rust-lang/rust/pull/42571
6509 [42613]: https://github.com/rust-lang/rust/pull/42613
6510 [42799]: https://github.com/rust-lang/rust/pull/42799
6511 [42807]: https://github.com/rust-lang/rust/pull/42807
6512 [42809]: https://github.com/rust-lang/rust/pull/42809
6513 [42822]: https://github.com/rust-lang/rust/pull/42822
6514 [42826]: https://github.com/rust-lang/rust/pull/42826
6515 [42854]: https://github.com/rust-lang/rust/pull/42854
6516 [42913]: https://github.com/rust-lang/rust/pull/42913
6517 [42999]: https://github.com/rust-lang/rust/pull/42999
6518 [43011]: https://github.com/rust-lang/rust/pull/43011
6519 [43015]: https://github.com/rust-lang/rust/pull/43015
6520 [43072]: https://github.com/rust-lang/rust/pull/43072
6521 [43077]: https://github.com/rust-lang/rust/pull/43077
6522 [43097]: https://github.com/rust-lang/rust/pull/43097
6523 [43099]: https://github.com/rust-lang/rust/pull/43099
6524 [43170]: https://github.com/rust-lang/rust/pull/43170
6525 [43178]: https://github.com/rust-lang/rust/pull/43178
6526 [43185]: https://github.com/rust-lang/rust/pull/43185
6527 [43228]: https://github.com/rust-lang/rust/pull/43228
6528 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6529 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6530 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6531 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6532 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6533 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6534 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6535 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6536 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6537 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6538 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6539 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6540 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6541 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6542 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6543 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6544 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6545 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6546 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6547 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6548 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6549 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6550 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6551 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6552 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6553 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6554 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6555 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6556 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6557 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6558 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6559 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6560 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6561 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6562 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6563 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6564 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6565 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6568 Version 1.19.0 (2017-07-20)
6569 ===========================
6574 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6575 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6576 - [Macro recursion limit increased to 1024 from 64.][41676]
6577 - [Added lint for detecting unused macros.][41907]
6578 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6579 For example: `let x = loop { break 7; };`
6580 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6581 contain `Copy` types and cannot have a `Drop` implementation.
6582 Example: `union Foo { bar: u8, baz: usize }`
6583 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6584 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6589 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6590 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6591 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6592 you should use `--target armv7-linux-androideabi`.
6593 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6594 - [Minor optimisation of string operations.][42037]
6595 - [Compiler error message is now `aborting due to previous error(s)` instead of
6596 `aborting due to N previous errors`][42150] This was previously inaccurate and
6597 would only count certain kinds of errors.
6598 - [The compiler now supports Visual Studio 2017][42225]
6599 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6600 - [Added a lot][42264] of [new error codes][42302]
6601 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6602 libraries with C Run-time Libraries(CRT) to be statically linked.
6603 - [Fixed various ARM codegen bugs][42740]
6608 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6609 `Extend<Cow<'a, str>>`][41449]
6610 - [`Vec` now implements `From<&mut [T]>`][41530]
6611 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6612 - [`SplitWhitespace` now implements `Clone`][41659]
6613 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6615 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6616 macros, but for printing to stderr.
6621 - [`OsString::shrink_to_fit`]
6624 - [`thread::ThreadId`]
6629 - [Build scripts can now add environment variables to the environment
6630 the crate is being compiled in.
6631 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6632 - [Subcommands now replace the current process rather than spawning a new
6633 child process][cargo/3970]
6634 - [Workspace members can now accept glob file patterns][cargo/3979]
6635 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6636 the members in a given workspace.][cargo/3988]
6637 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6638 - [Target directory path is now in the cargo metadata][cargo/4022]
6639 - [Cargo no longer checks out a local working directory for the
6640 crates.io index][cargo/4026] This should provide smaller file size for the
6641 registry, and improve cloning times, especially on Windows machines.
6642 - [Added an `--exclude` option for excluding certain packages when using the
6643 `--all` option][cargo/4031]
6644 - [Cargo will now automatically retry when receiving a 5xx error
6645 from crates.io][cargo/4032]
6646 - [The `--features` option now accepts multiple comma or space
6647 delimited values.][cargo/4084]
6648 - [Added support for custom target specific runners][cargo/3954]
6653 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6655 - [Rust will now release XZ compressed packages][rust-installer/57]
6656 - [rustup will now prefer to download rust packages with
6657 XZ compression][rustup/1100] over GZip packages.
6658 - [Added the ability to escape `#` in rust documentation][41785] By adding
6659 additional `#`'s ie. `##` is now `#`
6664 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6665 - [`-Z` flags are now no longer allowed to be used on the stable
6666 compiler.][41751] This has been a warning for a year previous to this.
6667 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6668 longer works][42844]. Users should migrate to the built-in `check`
6669 command, which has been available since 1.16.
6670 - [Ending a float literal with `._` is now a hard error.
6671 Example: `42._` .][41946]
6672 - [Any use of a private `extern crate` outside of its module is now a
6673 hard error.][36886] This was previously a warning.
6674 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6675 relative while the `::` prefix makes a path absolute, but was ignored and the
6676 path was relative regardless.
6677 - [Floating point constants in match patterns is now a hard error][36890]
6678 This was previously a warning.
6679 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6680 match patterns is now a hard error][36891] This was previously a warning.
6681 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6683 - [From the pound escape, lines consisting of multiple `#`s are
6685 - [It is an error to re-export private enum variants][42460]. This is
6686 known to break a number of crates that depend on an older version of
6688 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6689 to use it to find the linker, and the build will fail where it did
6690 not previously][42607]
6692 [36886]: https://github.com/rust-lang/rust/issues/36886
6693 [36888]: https://github.com/rust-lang/rust/issues/36888
6694 [36890]: https://github.com/rust-lang/rust/issues/36890
6695 [36891]: https://github.com/rust-lang/rust/issues/36891
6696 [36892]: https://github.com/rust-lang/rust/issues/36892
6697 [37406]: https://github.com/rust-lang/rust/issues/37406
6698 [39983]: https://github.com/rust-lang/rust/pull/39983
6699 [41145]: https://github.com/rust-lang/rust/pull/41145
6700 [41192]: https://github.com/rust-lang/rust/pull/41192
6701 [41258]: https://github.com/rust-lang/rust/pull/41258
6702 [41370]: https://github.com/rust-lang/rust/pull/41370
6703 [41449]: https://github.com/rust-lang/rust/pull/41449
6704 [41530]: https://github.com/rust-lang/rust/pull/41530
6705 [41624]: https://github.com/rust-lang/rust/pull/41624
6706 [41656]: https://github.com/rust-lang/rust/pull/41656
6707 [41659]: https://github.com/rust-lang/rust/pull/41659
6708 [41676]: https://github.com/rust-lang/rust/pull/41676
6709 [41751]: https://github.com/rust-lang/rust/pull/41751
6710 [41764]: https://github.com/rust-lang/rust/pull/41764
6711 [41785]: https://github.com/rust-lang/rust/pull/41785
6712 [41873]: https://github.com/rust-lang/rust/pull/41873
6713 [41907]: https://github.com/rust-lang/rust/pull/41907
6714 [41946]: https://github.com/rust-lang/rust/pull/41946
6715 [42016]: https://github.com/rust-lang/rust/pull/42016
6716 [42037]: https://github.com/rust-lang/rust/pull/42037
6717 [42068]: https://github.com/rust-lang/rust/pull/42068
6718 [42150]: https://github.com/rust-lang/rust/pull/42150
6719 [42162]: https://github.com/rust-lang/rust/pull/42162
6720 [42225]: https://github.com/rust-lang/rust/pull/42225
6721 [42264]: https://github.com/rust-lang/rust/pull/42264
6722 [42302]: https://github.com/rust-lang/rust/pull/42302
6723 [42460]: https://github.com/rust-lang/rust/issues/42460
6724 [42607]: https://github.com/rust-lang/rust/issues/42607
6725 [42740]: https://github.com/rust-lang/rust/pull/42740
6726 [42844]: https://github.com/rust-lang/rust/issues/42844
6727 [42948]: https://github.com/rust-lang/rust/pull/42948
6728 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6729 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6730 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6731 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6732 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6733 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6734 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6735 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6736 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6737 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6738 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6739 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6740 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6741 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6742 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6743 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6744 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6745 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6746 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6747 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6748 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6749 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6752 Version 1.18.0 (2017-06-08)
6753 ===========================
6758 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6759 make the item visible to just that module tree. Also accepts the keyword
6760 `crate` to make something public to the whole crate but not users of the
6761 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6762 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6763 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6764 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6765 types like `Write + Send`, trailing `+` are now supported in trait objects,
6766 and better error reporting for trait objects starting with `?Sized`.
6767 - [0e+10 is now a valid floating point literal][40589]
6768 - [Now warns if you bind a lifetime parameter to 'static][40734]
6769 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6770 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6771 representation in some cases.][40377]
6776 - [rustc can now emit mir with `--emit mir`][39891]
6777 - [Improved LLVM IR for trivial functions][40367]
6778 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6779 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6780 opportunities found through profiling
6781 - [Improved backtrace formatting when panicking][38165]
6786 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6787 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6788 iteration or reallocation.
6789 - [Simplified HashMap Bucket interface][40561] provides performance
6790 improvements for iterating and cloning.
6791 - [Specialize Vec::from_elem to use calloc][40409]
6792 - [Fixed Race condition in fs::create_dir_all][39799]
6793 - [No longer caching stdio on Windows][40516]
6794 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6795 2.50%~ faster and in one case now 12.50% faster.
6796 - [Optimized `AtomicBool::fetch_nand`][41143]
6801 - [`Child::try_wait`]
6802 - [`HashMap::retain`]
6803 - [`HashSet::retain`]
6805 - [`TcpStream::peek`]
6806 - [`UdpSocket::peek`]
6807 - [`UdpSocket::peek_from`]
6812 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6813 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6814 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6815 - [Added Android build support][cargo/3885]
6816 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6817 of a certain type, for example `cargo build --bins` will build all
6819 - [Added support for haiku][cargo/3952]
6824 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6825 - [Rust now uses the official cross compiler for NetBSD][40612]
6826 - [rustdoc now accepts `#` at the start of files][40828]
6827 - [Fixed jemalloc support for musl][41168]
6832 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6833 always placed after the sign if it exists and before the digits. With the `#`
6834 flag the zeroes are placed after the prefix and before the digits.
6835 - [Due to the struct field optimisation][40377], using `transmute` on structs
6836 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6837 always been undefined behavior, but is now more likely to break in practice.
6838 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6839 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6840 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6841 - [Overlapping inherent `impl`s are now a hard error][40728]
6842 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6843 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6844 `out.asm` and `out.ll` instead of only one of the filetypes.
6845 - [ calling a function that returns `Self` will no longer work][41805] when
6846 the size of `Self` cannot be statically determined.
6847 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6848 this has caused a few regressions namely:
6850 - Changed the link order of local static/dynamic libraries (respecting the
6851 order on given rather than having the compiler reorder).
6852 - Changed how MinGW is linked, native code linked to dynamic libraries
6853 may require manually linking to the gcc support library (for the native
6856 [38165]: https://github.com/rust-lang/rust/pull/38165
6857 [39799]: https://github.com/rust-lang/rust/pull/39799
6858 [39891]: https://github.com/rust-lang/rust/pull/39891
6859 [40043]: https://github.com/rust-lang/rust/pull/40043
6860 [40241]: https://github.com/rust-lang/rust/pull/40241
6861 [40338]: https://github.com/rust-lang/rust/pull/40338
6862 [40367]: https://github.com/rust-lang/rust/pull/40367
6863 [40377]: https://github.com/rust-lang/rust/pull/40377
6864 [40409]: https://github.com/rust-lang/rust/pull/40409
6865 [40516]: https://github.com/rust-lang/rust/pull/40516
6866 [40556]: https://github.com/rust-lang/rust/pull/40556
6867 [40561]: https://github.com/rust-lang/rust/pull/40561
6868 [40589]: https://github.com/rust-lang/rust/pull/40589
6869 [40612]: https://github.com/rust-lang/rust/pull/40612
6870 [40723]: https://github.com/rust-lang/rust/pull/40723
6871 [40728]: https://github.com/rust-lang/rust/pull/40728
6872 [40731]: https://github.com/rust-lang/rust/pull/40731
6873 [40734]: https://github.com/rust-lang/rust/pull/40734
6874 [40805]: https://github.com/rust-lang/rust/pull/40805
6875 [40807]: https://github.com/rust-lang/rust/pull/40807
6876 [40828]: https://github.com/rust-lang/rust/pull/40828
6877 [40870]: https://github.com/rust-lang/rust/pull/40870
6878 [41085]: https://github.com/rust-lang/rust/pull/41085
6879 [41143]: https://github.com/rust-lang/rust/pull/41143
6880 [41168]: https://github.com/rust-lang/rust/pull/41168
6881 [41270]: https://github.com/rust-lang/rust/issues/41270
6882 [41469]: https://github.com/rust-lang/rust/pull/41469
6883 [41805]: https://github.com/rust-lang/rust/issues/41805
6884 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6885 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6886 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6887 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6888 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6889 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6890 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6891 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6892 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6893 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6894 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6895 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6896 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6897 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6900 Version 1.17.0 (2017-04-27)
6901 ===========================
6906 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6907 * [Fields of structs may be initialized without duplicating the field/variable
6908 names][39761]. [RFC 1682]
6909 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6910 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6911 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6912 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6913 `'b`. Soundness fix.
6914 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6915 * [Static variables may contain references to other statics][40027]
6920 * [Exit quickly on only `--emit dep-info`][40336]
6921 * [Make `-C relocation-model` more correctly determine whether the linker
6922 creates a position-independent executable][40245]
6923 * [Add `-C overflow-checks` to directly control whether integer overflow
6925 * [The rustc type checker now checks items on demand instead of in a single
6926 in-order pass][40008]. This is mostly an internal refactoring in support of
6927 future work, including incremental type checking, but also resolves [RFC
6928 1647], allowing `Self` to appear in `impl` `where` clauses.
6929 * [Optimize vtable loads][39995]
6930 * [Turn off vectorization for Emscripten targets][39990]
6931 * [Provide suggestions for unknown macros imported with `use`][39953]
6932 * [Fix ICEs in path resolution][39939]
6933 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6934 * [Add clearer error message using `&str + &str`][39116]
6945 * [`Ordering::then`]
6946 * [`Ordering::then_with`]
6947 * [`BTreeMap::range`]
6948 * [`BTreeMap::range_mut`]
6949 * [`collections::Bound`]
6950 * [`process::abort`]
6951 * [`ptr::read_unaligned`]
6952 * [`ptr::write_unaligned`]
6953 * [`Result::expect_err`]
6956 * [`Cell::into_inner`]
6962 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6963 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6964 * [`String` implements `FromIterator<&char>`][40028]
6965 * `Box` [implements][40009] a number of new conversions:
6966 `From<Box<str>> for String`,
6967 `From<Box<[T]>> for Vec<T>`,
6968 `From<Box<CStr>> for CString`,
6969 `From<Box<OsStr>> for OsString`,
6970 `From<Box<Path>> for PathBuf`,
6971 `Into<Box<str>> for String`,
6972 `Into<Box<[T]>> for Vec<T>`,
6973 `Into<Box<CStr>> for CString`,
6974 `Into<Box<OsStr>> for OsString`,
6975 `Into<Box<Path>> for PathBuf`,
6976 `Default for Box<str>`,
6977 `Default for Box<CStr>`,
6978 `Default for Box<OsStr>`,
6979 `From<&CStr> for Box<CStr>`,
6980 `From<&OsStr> for Box<OsStr>`,
6981 `From<&Path> for Box<Path>`
6982 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6983 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6984 * [Slightly optimize `slice::sort`][39538]
6985 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6986 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6987 `Box<str>` implements `From<&str>`][39438]
6988 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6989 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6990 * [`format!` estimates the needed capacity before writing a string][39356]
6991 * [Support unprivileged symlink creation in Windows][38921]
6992 * [`PathBuf` implements `Default`][38764]
6993 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6994 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6995 and poor hash functions.
7000 * [Add `cargo check --all`][cargo/3731]
7001 * [Add an option to ignore SSL revocation checking][cargo/3699]
7002 * [Add `cargo run --package`][cargo/3691]
7003 * [Add `required_features`][cargo/3667]
7004 * [Assume `build.rs` is a build script][cargo/3664]
7005 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
7010 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
7012 * [The "Unstable Book" documents nightly-only features][ubook]
7013 * [Improve the style of the sidebar in rustdoc output][40265]
7014 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
7015 * [Fix MSP430 breakage due to `i128`][40257]
7016 * [Preliminary Solaris/SPARCv9 support][39903]
7017 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
7018 run without installing the MSVC runtime.
7019 * [`rustdoc --test` includes file names in test names][39788]
7020 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
7021 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
7022 * [Initial support for `aarch64-unknown-freebsd`][39491]
7023 * [Initial support for `i686-unknown-netbsd`][39426]
7024 * [This release no longer includes the old makefile build system][39431]. Rust
7025 is built with a custom build system, written in Rust, and with Cargo.
7026 * [Add Debug implementations for libcollection structs][39002]
7027 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
7028 * [`--test-threads=0` produces an error][38945]
7029 * [`rustup` installs documentation by default][40526]
7030 * [The Rust source includes NatVis visualizations][39843]. These can be used by
7031 WinDbg and Visual Studio to improve the debugging experience.
7036 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
7037 workaround, either use MSVC 2015 or run vcvars.bat.
7038 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7039 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
7040 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
7042 * [`format!` and `Display::to_string` panic if an underlying formatting
7043 implementation returns an error][40117]. Previously the error was silently
7044 ignored. It is incorrect for `write_fmt` to return an error when writing
7046 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
7047 crates were marked stable and could be accessed from the stable toolchain.
7048 * [Rust git source no longer includes vendored crates][39728]. Those that need
7049 to build with vendored crates should build from release tarballs.
7050 * [Fix inert attributes from `proc_macro_derives`][39572]
7051 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
7052 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
7054 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
7055 existing code generally ignores the type of dead-code unless a type-hint is
7056 provided; this can cause surprising inference interactions particularly around
7057 defaulting. The new code uniformly ignores the result type of dead-code.
7058 * [Tuple-struct constructors with private fields are no longer visible][38932]
7059 * [Lifetime parameters that do not appear in the arguments are now considered
7060 early-bound][38897], resolving a soundness bug (#[32330]). The
7061 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
7063 * [rustdoc: fix doctests with non-feature crate attributes][38161]
7064 * [Make transmuting from fn item types to pointer-sized types a hard
7067 [27787]: https://github.com/rust-lang/rust/issues/27787
7068 [32330]: https://github.com/rust-lang/rust/issues/32330
7069 [34198]: https://github.com/rust-lang/rust/pull/34198
7070 [38161]: https://github.com/rust-lang/rust/pull/38161
7071 [38368]: https://github.com/rust-lang/rust/pull/38368
7072 [38584]: https://github.com/rust-lang/rust/issues/38584
7073 [38661]: https://github.com/rust-lang/rust/pull/38661
7074 [38764]: https://github.com/rust-lang/rust/pull/38764
7075 [38864]: https://github.com/rust-lang/rust/issues/38864
7076 [38897]: https://github.com/rust-lang/rust/pull/38897
7077 [38921]: https://github.com/rust-lang/rust/pull/38921
7078 [38932]: https://github.com/rust-lang/rust/pull/38932
7079 [38945]: https://github.com/rust-lang/rust/pull/38945
7080 [38981]: https://github.com/rust-lang/rust/pull/38981
7081 [39002]: https://github.com/rust-lang/rust/pull/39002
7082 [39116]: https://github.com/rust-lang/rust/pull/39116
7083 [39193]: https://github.com/rust-lang/rust/pull/39193
7084 [39265]: https://github.com/rust-lang/rust/pull/39265
7085 [39356]: https://github.com/rust-lang/rust/pull/39356
7086 [39372]: https://github.com/rust-lang/rust/pull/39372
7087 [39426]: https://github.com/rust-lang/rust/pull/39426
7088 [39431]: https://github.com/rust-lang/rust/pull/39431
7089 [39438]: https://github.com/rust-lang/rust/pull/39438
7090 [39440]: https://github.com/rust-lang/rust/pull/39440
7091 [39485]: https://github.com/rust-lang/rust/pull/39485
7092 [39491]: https://github.com/rust-lang/rust/pull/39491
7093 [39518]: https://github.com/rust-lang/rust/pull/39518
7094 [39538]: https://github.com/rust-lang/rust/pull/39538
7095 [39572]: https://github.com/rust-lang/rust/pull/39572
7096 [39633]: https://github.com/rust-lang/rust/pull/39633
7097 [39642]: https://github.com/rust-lang/rust/pull/39642
7098 [39728]: https://github.com/rust-lang/rust/pull/39728
7099 [39761]: https://github.com/rust-lang/rust/pull/39761
7100 [39788]: https://github.com/rust-lang/rust/pull/39788
7101 [39793]: https://github.com/rust-lang/rust/pull/39793
7102 [39837]: https://github.com/rust-lang/rust/pull/39837
7103 [39843]: https://github.com/rust-lang/rust/pull/39843
7104 [39851]: https://github.com/rust-lang/rust/pull/39851
7105 [39903]: https://github.com/rust-lang/rust/pull/39903
7106 [39939]: https://github.com/rust-lang/rust/pull/39939
7107 [39953]: https://github.com/rust-lang/rust/pull/39953
7108 [39960]: https://github.com/rust-lang/rust/pull/39960
7109 [39990]: https://github.com/rust-lang/rust/pull/39990
7110 [39995]: https://github.com/rust-lang/rust/pull/39995
7111 [40008]: https://github.com/rust-lang/rust/pull/40008
7112 [40009]: https://github.com/rust-lang/rust/pull/40009
7113 [40027]: https://github.com/rust-lang/rust/pull/40027
7114 [40028]: https://github.com/rust-lang/rust/pull/40028
7115 [40037]: https://github.com/rust-lang/rust/pull/40037
7116 [40117]: https://github.com/rust-lang/rust/pull/40117
7117 [40166]: https://github.com/rust-lang/rust/pull/40166
7118 [40245]: https://github.com/rust-lang/rust/pull/40245
7119 [40257]: https://github.com/rust-lang/rust/pull/40257
7120 [40261]: https://github.com/rust-lang/rust/pull/40261
7121 [40265]: https://github.com/rust-lang/rust/pull/40265
7122 [40319]: https://github.com/rust-lang/rust/pull/40319
7123 [40336]: https://github.com/rust-lang/rust/pull/40336
7124 [40526]: https://github.com/rust-lang/rust/pull/40526
7125 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7126 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7127 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7128 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7129 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7130 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7131 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7132 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7133 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7134 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7135 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7136 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7137 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7138 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7139 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7140 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7141 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7142 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7143 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7144 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7145 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7146 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7147 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7148 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7149 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7150 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7151 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7152 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7153 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7154 [ubook]: https://doc.rust-lang.org/unstable-book/
7157 Version 1.16.0 (2017-03-16)
7158 ===========================
7163 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7164 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7165 match patterns][38069]
7166 * [Clean up semantics of `self` in an import list][38313]
7167 * [`Self` may appear in `impl` headers][38920]
7168 * [`Self` may appear in struct expressions][39282]
7173 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7174 a `.rmeta` file containing only crate metadata][38571]. This can be
7175 used by tools like the Rust Language Service to perform
7176 metadata-only builds.
7177 * [Levenshtein based typo suggestions now work in most places, while
7178 previously they worked only for fields and sometimes for local
7179 variables][38927]. Together with the overhaul of "no
7180 resolution"/"unexpected resolution" errors (#[38154]) they result in
7181 large and systematic improvement in resolution diagnostics.
7182 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7184 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7185 * [`rustc` no longer attempts to provide "consider using an explicit
7186 lifetime" suggestions][37057]. They were inaccurate.
7191 * [`VecDeque::truncate`]
7192 * [`VecDeque::resize`]
7193 * [`String::insert_str`]
7194 * [`Duration::checked_add`]
7195 * [`Duration::checked_sub`]
7196 * [`Duration::checked_div`]
7197 * [`Duration::checked_mul`]
7200 * [`SocketAddr::is_ipv4`]
7201 * [`SocketAddr::is_ipv6`]
7202 * [`IpAddr::is_ipv4`]
7203 * [`IpAddr::is_ipv6`]
7205 * [`Vec::dedup_by_key`]
7206 * [`Result::unwrap_or_default`]
7207 * [`<*const T>::wrapping_offset`]
7208 * [`<*mut T>::wrapping_offset`]
7209 * `CommandExt::creation_flags`
7210 * [`File::set_permissions`]
7211 * [`String::split_off`]
7216 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7217 their argument by `Borrow` parameter][37761]
7218 * [All public types in std implement `Debug`][38006]
7219 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7220 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7221 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7223 * [std: Fix partial writes in `LineWriter`][38062]
7224 * [std: Clamp max read/write sizes on Unix][38622]
7225 * [Use more specific panic message for `&str` slicing errors][38066]
7226 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7227 functionality cannot be achieved in std currently.
7228 * [`writeln!`, like `println!`, now accepts a form with no string
7229 or formatting arguments, to just print a newline][38469]
7230 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7231 * [Reduce the size of static data in `std_unicode::tables`][38781]
7232 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7233 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7235 * [`Duration` implements `Sum`][38712]
7236 * [`String` implements `ToSocketAddrs`][39048]
7241 * [The `cargo check` command does a type check of a project without
7242 building it][cargo/3296]
7243 * [crates.io will display CI badges from Travis and AppVeyor, if
7244 specified in Cargo.toml][cargo/3546]
7245 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7246 * [Compilation profiles accept integer values for `debug`, in addition
7247 to `true` and `false`. These are passed to `rustc` as the value to
7248 `-C debuginfo`][cargo/3534]
7249 * [Implement `cargo --version --verbose`][cargo/3604]
7250 * [All builds now output 'dep-info' build dependencies compatible with
7251 make and ninja][cargo/3557]
7252 * [Build all workspace members with `build --all`][cargo/3511]
7253 * [Document all workspace members with `doc --all`][cargo/3515]
7254 * [Path deps outside workspace are not members][cargo/3443]
7259 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7260 the path to the Rust implementation][38589]
7261 * [The `armv7-linux-androideabi` target no longer enables NEON
7262 extensions, per Google's ABI guide][38413]
7263 * [The stock standard library can be compiled for Redox OS][38401]
7264 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7266 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7268 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7273 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7274 match patterns][38069]
7275 * In this release, references to uninhabited types can not be
7276 pattern-matched. This was accidentally allowed in 1.15.
7277 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7278 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7280 * [Clean up semantics of `self` in an import list][38313]
7281 * Reimplemented lifetime elision. This change was almost entirely compatible
7282 with existing code, but it did close a number of small bugs and loopholes,
7283 as well as being more accepting in some other [cases][41105].
7285 [37057]: https://github.com/rust-lang/rust/pull/37057
7286 [37761]: https://github.com/rust-lang/rust/pull/37761
7287 [38006]: https://github.com/rust-lang/rust/pull/38006
7288 [38051]: https://github.com/rust-lang/rust/pull/38051
7289 [38062]: https://github.com/rust-lang/rust/pull/38062
7290 [38622]: https://github.com/rust-lang/rust/pull/38622
7291 [38066]: https://github.com/rust-lang/rust/pull/38066
7292 [38069]: https://github.com/rust-lang/rust/pull/38069
7293 [38131]: https://github.com/rust-lang/rust/pull/38131
7294 [38154]: https://github.com/rust-lang/rust/pull/38154
7295 [38274]: https://github.com/rust-lang/rust/pull/38274
7296 [38304]: https://github.com/rust-lang/rust/pull/38304
7297 [38313]: https://github.com/rust-lang/rust/pull/38313
7298 [38327]: https://github.com/rust-lang/rust/pull/38327
7299 [38401]: https://github.com/rust-lang/rust/pull/38401
7300 [38413]: https://github.com/rust-lang/rust/pull/38413
7301 [38469]: https://github.com/rust-lang/rust/pull/38469
7302 [38559]: https://github.com/rust-lang/rust/pull/38559
7303 [38571]: https://github.com/rust-lang/rust/pull/38571
7304 [38580]: https://github.com/rust-lang/rust/pull/38580
7305 [38589]: https://github.com/rust-lang/rust/pull/38589
7306 [38670]: https://github.com/rust-lang/rust/pull/38670
7307 [38712]: https://github.com/rust-lang/rust/pull/38712
7308 [38726]: https://github.com/rust-lang/rust/pull/38726
7309 [38781]: https://github.com/rust-lang/rust/pull/38781
7310 [38798]: https://github.com/rust-lang/rust/pull/38798
7311 [38909]: https://github.com/rust-lang/rust/pull/38909
7312 [38920]: https://github.com/rust-lang/rust/pull/38920
7313 [38927]: https://github.com/rust-lang/rust/pull/38927
7314 [39048]: https://github.com/rust-lang/rust/pull/39048
7315 [39282]: https://github.com/rust-lang/rust/pull/39282
7316 [39379]: https://github.com/rust-lang/rust/pull/39379
7317 [41105]: https://github.com/rust-lang/rust/issues/41105
7318 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7319 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7320 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7321 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7322 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7323 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7324 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7325 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7326 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7327 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7328 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7329 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7330 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7331 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7332 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7333 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7334 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7335 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7336 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7337 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7338 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7339 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7340 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7341 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7342 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7343 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7344 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7345 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7346 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7349 Version 1.15.1 (2017-02-09)
7350 ===========================
7352 * [Fix IntoIter::as_mut_slice's signature][39466]
7353 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7355 [39466]: https://github.com/rust-lang/rust/pull/39466
7356 [39523]: https://github.com/rust-lang/rust/pull/39523
7359 Version 1.15.0 (2017-02-02)
7360 ===========================
7365 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7366 stable. This allows popular code-generating crates like Serde and Diesel to
7367 work ergonomically. [RFC 1681].
7368 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7369 with curly braces][36868]. Part of [RFC 1506].
7370 * [A number of minor changes to name resolution have been activated][37127].
7371 They add up to more consistent semantics, allowing for future evolution of
7372 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7373 details of what is different. The breaking changes here have been transitioned
7374 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7375 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7377 * [`?Sized` can be used in `where` clauses][37791]
7378 * [There is now a limit on the size of monomorphized types and it can be
7379 modified with the `#![type_size_limit]` crate attribute, similarly to
7380 the `#![recursion_limit]` attribute][37789]
7385 * [On Windows, the compiler will apply dllimport attributes when linking to
7386 extern functions][37973]. Additional attributes and flags can control which
7387 library kind is linked and its name. [RFC 1717].
7388 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7389 * [The `--test` flag works with procedural macro crates][38107]
7390 * [Fix `extern "aapcs" fn` ABI][37814]
7391 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7392 * [The `format!` expander recognizes incorrect `printf` and shell-style
7393 formatting directives and suggests the correct format][37613].
7394 * [Only report one error for all unused imports in an import list][37456]
7396 Compiler Performance
7397 --------------------
7399 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7400 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7401 * [Don't clone in `UnificationTable::probe`][37848]
7402 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7403 * [Use small vectors in type walker][37760]
7404 * [Macro expansion performance was improved][37701]
7405 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7406 * [Replace FNV with a faster hash function][37229]
7411 * [`std::iter::Iterator::min_by`]
7412 * [`std::iter::Iterator::max_by`]
7413 * [`std::os::*::fs::FileExt`]
7414 * [`std::sync::atomic::Atomic*::get_mut`]
7415 * [`std::sync::atomic::Atomic*::into_inner`]
7416 * [`std::vec::IntoIter::as_slice`]
7417 * [`std::vec::IntoIter::as_mut_slice`]
7418 * [`std::sync::mpsc::Receiver::try_iter`]
7419 * [`std::os::unix::process::CommandExt::before_exec`]
7420 * [`std::rc::Rc::strong_count`]
7421 * [`std::rc::Rc::weak_count`]
7422 * [`std::sync::Arc::strong_count`]
7423 * [`std::sync::Arc::weak_count`]
7424 * [`std::char::encode_utf8`]
7425 * [`std::char::encode_utf16`]
7426 * [`std::cell::Ref::clone`]
7427 * [`std::io::Take::into_inner`]
7432 * [The standard sorting algorithm has been rewritten for dramatic performance
7433 improvements][38192]. It is a hybrid merge sort, drawing influences from
7434 Timsort. Previously it was a naive merge sort.
7435 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7436 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7438 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7439 and `char_indices().last()`][37882]
7440 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7441 * [Chinese characters display correctly in `fmt::Debug`][37855]
7442 * [Derive `Default` for `Duration`][37699]
7443 * [Support creation of anonymous pipes on WinXP/2k][37677]
7444 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7445 * [Don't pass overlapped handles to processes][38835]
7450 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7451 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7452 should instead check the variable at runtime with `std::env`. That the value
7453 was set at build time was a bug, and incorrect when cross-compiling. This
7454 change is known to cause breakage.
7455 * [Add `--all` flag to `cargo test`][cargo/3221]
7456 * [Compile statically against the MSVC CRT][cargo/3363]
7457 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7458 * [Link OpenSSL statically on OSX][cargo/3311]
7459 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7460 * [Test for bad path overrides with summaries][cargo/3336]
7461 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7462 * [Fix retrying crate downloads for network errors][cargo/3348]
7463 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7464 * [Emit more info on --message-format=json][cargo/3319]
7465 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7466 * [Don't ignore errors in workspace manifest][cargo/3409]
7467 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7472 * [Test runners (binaries built with `--test`) now support a `--list` argument
7473 that lists the tests it contains][38185]
7474 * [Test runners now support a `--exact` argument that makes the test filter
7475 match exactly, instead of matching only a substring of the test name][38181]
7476 * [rustdoc supports a `--playground-url` flag][37763]
7477 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7482 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7483 continue to be used in this release by passing `--disable-rustbuild` to the
7484 configure script, but they will be deleted soon. Note that the new build
7485 system uses a different on-disk layout that will likely affect any scripts
7487 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7489 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7490 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7496 * [A number of minor changes to name resolution have been activated][37127].
7497 They add up to more consistent semantics, allowing for future evolution of
7498 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7499 details of what is different. The breaking changes here have been transitioned
7500 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7501 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7502 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7503 should instead check the variable at runtime with `std::env`. That the value
7504 was set at build time was a bug, and incorrect when cross-compiling. This
7505 change is known to cause breakage.
7506 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7507 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7508 1.10 and is now an error by default. It will become a hard error in the near
7510 * [The semantics relating modules to file system directories are changing in
7511 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7512 lint, which is a warning in this release, and will become a hard error in the
7514 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7515 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7516 the underlying iterator][37834]
7518 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7519 [33685]: https://github.com/rust-lang/rust/issues/33685
7520 [36868]: https://github.com/rust-lang/rust/pull/36868
7521 [37127]: https://github.com/rust-lang/rust/pull/37127
7522 [37229]: https://github.com/rust-lang/rust/pull/37229
7523 [37456]: https://github.com/rust-lang/rust/pull/37456
7524 [37527]: https://github.com/rust-lang/rust/pull/37527
7525 [37602]: https://github.com/rust-lang/rust/pull/37602
7526 [37613]: https://github.com/rust-lang/rust/pull/37613
7527 [37615]: https://github.com/rust-lang/rust/pull/37615
7528 [37636]: https://github.com/rust-lang/rust/pull/37636
7529 [37627]: https://github.com/rust-lang/rust/pull/37627
7530 [37642]: https://github.com/rust-lang/rust/pull/37642
7531 [37677]: https://github.com/rust-lang/rust/pull/37677
7532 [37699]: https://github.com/rust-lang/rust/pull/37699
7533 [37701]: https://github.com/rust-lang/rust/pull/37701
7534 [37705]: https://github.com/rust-lang/rust/pull/37705
7535 [37749]: https://github.com/rust-lang/rust/pull/37749
7536 [37760]: https://github.com/rust-lang/rust/pull/37760
7537 [37763]: https://github.com/rust-lang/rust/pull/37763
7538 [37764]: https://github.com/rust-lang/rust/pull/37764
7539 [37789]: https://github.com/rust-lang/rust/pull/37789
7540 [37791]: https://github.com/rust-lang/rust/pull/37791
7541 [37814]: https://github.com/rust-lang/rust/pull/37814
7542 [37817]: https://github.com/rust-lang/rust/pull/37817
7543 [37834]: https://github.com/rust-lang/rust/pull/37834
7544 [37848]: https://github.com/rust-lang/rust/pull/37848
7545 [37855]: https://github.com/rust-lang/rust/pull/37855
7546 [37882]: https://github.com/rust-lang/rust/pull/37882
7547 [37888]: https://github.com/rust-lang/rust/pull/37888
7548 [37973]: https://github.com/rust-lang/rust/pull/37973
7549 [37979]: https://github.com/rust-lang/rust/pull/37979
7550 [38086]: https://github.com/rust-lang/rust/pull/38086
7551 [38107]: https://github.com/rust-lang/rust/pull/38107
7552 [38117]: https://github.com/rust-lang/rust/pull/38117
7553 [38134]: https://github.com/rust-lang/rust/pull/38134
7554 [38146]: https://github.com/rust-lang/rust/pull/38146
7555 [38181]: https://github.com/rust-lang/rust/pull/38181
7556 [38182]: https://github.com/rust-lang/rust/pull/38182
7557 [38185]: https://github.com/rust-lang/rust/pull/38185
7558 [38192]: https://github.com/rust-lang/rust/pull/38192
7559 [38279]: https://github.com/rust-lang/rust/pull/38279
7560 [38835]: https://github.com/rust-lang/rust/pull/38835
7561 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7562 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7563 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7564 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7565 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7566 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7567 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7568 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7569 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7570 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7571 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7572 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7573 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7574 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7575 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7576 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7577 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7578 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7579 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7580 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7581 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7582 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7583 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7584 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7585 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7586 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7587 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7588 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7589 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7590 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7591 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7592 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7593 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7594 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7595 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7596 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7597 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7600 Version 1.14.0 (2016-12-22)
7601 ===========================
7606 * [`..` matches multiple tuple fields in enum variants, structs
7607 and tuples][36843]. [RFC 1492].
7608 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7609 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7610 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7611 dereferencing][36822]
7616 * [Mark enums with non-zero discriminant as non-zero][37224]
7617 * [Lower-case `static mut` names are linted like other
7618 statics and consts][37162]
7619 * [Fix ICE on some macros in const integer positions
7620 (e.g. `[u8; m!()]`)][36819]
7621 * [Improve error message and snippet for "did you mean `x`"][36798]
7622 * [Add a panic-strategy field to the target specification][36794]
7623 * [Include LLVM version in `--version --verbose`][37200]
7625 Compile-time Optimizations
7626 --------------------------
7628 * [Improve macro expansion performance][37569]
7629 * [Shrink `Expr_::ExprInlineAsm`][37445]
7630 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7631 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7632 * [Avoid more allocations when compiling html5ever][37373]
7633 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7634 * [Avoid some allocations in the macro parser][37318]
7635 * [Use a faster deflate setting][37298]
7636 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7637 during interning of slices][37270]
7638 * [Optimize `write_metadata`][37267]
7639 * [Don't process obligation forest cycles when stalled][37231]
7640 * [Avoid many `CrateConfig` clones][37161]
7641 * [Optimize `Substs::super_fold_with`][37108]
7642 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7643 * [Speed up `plug_leaks`][36917]
7648 * [`println!()`, with no arguments, prints newline][36825].
7649 Previously, an empty string was required to achieve the same.
7650 * [`Wrapping` impls standard binary and unary operators, as well as
7651 the `Sum` and `Product` iterators][37356]
7652 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7654 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7655 `VecDeque` iterators][37315]
7656 * [Improve `SipHasher` performance on small values][37312]
7657 * [Add Iterator trait TrustedLen to enable better FromIterator /
7659 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7660 * [`ReadDir` implements `Debug`][37221]
7661 * [Implement `RefUnwindSafe` for atomic types][37178]
7662 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7663 * [Avoid allocations in `Decoder::read_str`][37064]
7664 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7665 * [Impl `Debug` for raw pointers to unsized data][36880]
7666 * [Don't reuse `HashMap` random seeds][37470]
7667 * [The internal memory layout of `HashMap` is more cache-friendly, for
7668 significant improvements in some operations][36692]
7669 * [`HashMap` uses less memory on 32-bit architectures][36595]
7670 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7675 * [Expose rustc cfg values to build scripts][cargo/3243]
7676 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7677 * [Fix passing --features when testing multiple packages][cargo/3280]
7678 * [Use a single profile set per workspace][cargo/3249]
7679 * [Load `replace` sections from lock files][cargo/3220]
7680 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7685 * [rustup is the recommended Rust installation method][1.14rustup]
7686 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7687 S390x. These are [tier 2] platforms and may have major defects. Follow the
7688 instructions on the website to install, or add the targets to an existing
7689 installation with `rustup target add`. The new target triples are:
7690 - `mips-unknown-linux-gnu`
7691 - `mipsel-unknown-linux-gnu`
7692 - `mips64-unknown-linux-gnuabi64`
7693 - `mips64el-unknown-linux-gnuabi64 `
7694 - `powerpc-unknown-linux-gnu`
7695 - `powerpc64-unknown-linux-gnu`
7696 - `powerpc64le-unknown-linux-gnu`
7697 - `s390x-unknown-linux-gnu `
7698 * This release includes target (std) builds for ARM Linux running MUSL
7699 libc. These are [tier 2] platforms and may have major defects. Add the
7700 following triples to an existing rustup installation with `rustup target add`:
7701 - `arm-unknown-linux-musleabi`
7702 - `arm-unknown-linux-musleabihf`
7703 - `armv7-unknown-linux-musleabihf`
7704 * This release includes [experimental support for WebAssembly][1.14wasm], via
7705 the `wasm32-unknown-emscripten` target. This target is known to have major
7706 defects. Please test, report, and fix.
7707 * rustup no longer installs documentation by default. Run `rustup
7708 component add rust-docs` to install.
7709 * [Fix line stepping in debugger][37310]
7710 * [Enable line number debuginfo in releases][37280]
7715 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7716 * [Add support for Fuchsia OS][37313]
7717 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7722 * [A number of forward-compatibility lints used by the compiler
7723 to gradually introduce language changes have been converted
7724 to deny by default][36894]:
7725 - ["use of inaccessible extern crate erroneously allowed"][36886]
7726 - ["type parameter default erroneously allowed in invalid location"][36887]
7727 - ["detects super or self keywords at the beginning of global path"][36888]
7728 - ["two overlapping inherent impls define an item with the same name
7729 were erroneously allowed"][36889]
7730 - ["floating-point constants cannot be used in patterns"][36890]
7731 - ["constants of struct or enum type can only be used in a pattern if
7732 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7733 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7734 * [Prohibit patterns in trait methods without bodies][37378]
7735 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7736 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7737 * [The `$crate` macro variable is accepted in fewer locations][37213]
7738 * [Impls specifying extra region requirements beyond the trait
7739 they implement are rejected][37167]
7740 * [Enums may not be unsized][37111]. Unsized enums are intended to
7741 work but never have. For now they are forbidden.
7742 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7744 [tier 2]: https://forge.rust-lang.org/platform-support.html
7745 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7746 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7747 [36430]: https://github.com/rust-lang/rust/pull/36430
7748 [36595]: https://github.com/rust-lang/rust/pull/36595
7749 [36692]: https://github.com/rust-lang/rust/pull/36692
7750 [36767]: https://github.com/rust-lang/rust/pull/36767
7751 [36794]: https://github.com/rust-lang/rust/pull/36794
7752 [36798]: https://github.com/rust-lang/rust/pull/36798
7753 [36819]: https://github.com/rust-lang/rust/pull/36819
7754 [36822]: https://github.com/rust-lang/rust/pull/36822
7755 [36825]: https://github.com/rust-lang/rust/pull/36825
7756 [36843]: https://github.com/rust-lang/rust/pull/36843
7757 [36880]: https://github.com/rust-lang/rust/pull/36880
7758 [36886]: https://github.com/rust-lang/rust/issues/36886
7759 [36887]: https://github.com/rust-lang/rust/issues/36887
7760 [36888]: https://github.com/rust-lang/rust/issues/36888
7761 [36889]: https://github.com/rust-lang/rust/issues/36889
7762 [36890]: https://github.com/rust-lang/rust/issues/36890
7763 [36891]: https://github.com/rust-lang/rust/issues/36891
7764 [36892]: https://github.com/rust-lang/rust/issues/36892
7765 [36894]: https://github.com/rust-lang/rust/pull/36894
7766 [36917]: https://github.com/rust-lang/rust/pull/36917
7767 [36993]: https://github.com/rust-lang/rust/pull/36993
7768 [37037]: https://github.com/rust-lang/rust/pull/37037
7769 [37064]: https://github.com/rust-lang/rust/pull/37064
7770 [37094]: https://github.com/rust-lang/rust/pull/37094
7771 [37108]: https://github.com/rust-lang/rust/pull/37108
7772 [37111]: https://github.com/rust-lang/rust/pull/37111
7773 [37161]: https://github.com/rust-lang/rust/pull/37161
7774 [37162]: https://github.com/rust-lang/rust/pull/37162
7775 [37167]: https://github.com/rust-lang/rust/pull/37167
7776 [37178]: https://github.com/rust-lang/rust/pull/37178
7777 [37200]: https://github.com/rust-lang/rust/pull/37200
7778 [37213]: https://github.com/rust-lang/rust/pull/37213
7779 [37221]: https://github.com/rust-lang/rust/pull/37221
7780 [37224]: https://github.com/rust-lang/rust/pull/37224
7781 [37230]: https://github.com/rust-lang/rust/pull/37230
7782 [37231]: https://github.com/rust-lang/rust/pull/37231
7783 [37247]: https://github.com/rust-lang/rust/pull/37247
7784 [37267]: https://github.com/rust-lang/rust/pull/37267
7785 [37270]: https://github.com/rust-lang/rust/pull/37270
7786 [37273]: https://github.com/rust-lang/rust/pull/37273
7787 [37280]: https://github.com/rust-lang/rust/pull/37280
7788 [37298]: https://github.com/rust-lang/rust/pull/37298
7789 [37306]: https://github.com/rust-lang/rust/pull/37306
7790 [37310]: https://github.com/rust-lang/rust/pull/37310
7791 [37312]: https://github.com/rust-lang/rust/pull/37312
7792 [37313]: https://github.com/rust-lang/rust/pull/37313
7793 [37315]: https://github.com/rust-lang/rust/pull/37315
7794 [37318]: https://github.com/rust-lang/rust/pull/37318
7795 [37322]: https://github.com/rust-lang/rust/pull/37322
7796 [37326]: https://github.com/rust-lang/rust/pull/37326
7797 [37351]: https://github.com/rust-lang/rust/pull/37351
7798 [37356]: https://github.com/rust-lang/rust/pull/37356
7799 [37367]: https://github.com/rust-lang/rust/pull/37367
7800 [37373]: https://github.com/rust-lang/rust/pull/37373
7801 [37378]: https://github.com/rust-lang/rust/pull/37378
7802 [37389]: https://github.com/rust-lang/rust/pull/37389
7803 [37392]: https://github.com/rust-lang/rust/pull/37392
7804 [37427]: https://github.com/rust-lang/rust/pull/37427
7805 [37439]: https://github.com/rust-lang/rust/pull/37439
7806 [37445]: https://github.com/rust-lang/rust/pull/37445
7807 [37470]: https://github.com/rust-lang/rust/pull/37470
7808 [37569]: https://github.com/rust-lang/rust/pull/37569
7809 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7810 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7811 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7812 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7813 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7814 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7815 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7818 Version 1.13.0 (2016-11-10)
7819 ===========================
7824 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7825 errors, like the `try!` macro, described in [RFC 0243].
7826 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7827 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7828 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7829 * [Fix lifetime rules for 'if' conditions][36029]
7830 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7835 * [Add the `-C link-arg` argument][36574]
7836 * [Remove the old AST-based backend from rustc_trans][35764]
7837 * [Don't enable NEON by default on armv7 Linux][35814]
7838 * [Fix debug line number info for macro expansions][35238]
7839 * [Do not emit "class method" debuginfo for types that are not
7840 DICompositeType][36008]
7841 * [Warn about multiple conflicting #[repr] hints][34623]
7842 * [When sizing DST, don't double-count nested struct prefixes][36351]
7843 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7844 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7845 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7846 * [Expand macros without recursing to avoid stack overflows][36214]
7851 * [Replace macro backtraces with labeled local uses][35702]
7852 * [Improve error message for misplaced doc comments][33922]
7853 * [Buffer unix and lock windows to prevent message interleaving][35975]
7854 * [Update lifetime errors to specifically note temporaries][36171]
7855 * [Special case a few colors for Windows][36178]
7856 * [Suggest `use self` when such an import resolves][36289]
7857 * [Be more specific when type parameter shadows primitive type][36338]
7858 * Many minor improvements
7860 Compile-time Optimizations
7861 --------------------------
7863 * [Compute and cache HIR hashes at beginning][35854]
7864 * [Don't hash types in loan paths][36004]
7865 * [Cache projections in trans][35761]
7866 * [Optimize the parser's last token handling][36527]
7867 * [Only instantiate #[inline] functions in codegen units referencing
7868 them][36524]. This leads to big improvements in cases where crates export
7869 define many inline functions without using them directly.
7870 * [Lazily allocate TypedArena's first chunk][36592]
7871 * [Don't allocate during default HashSet creation][36734]
7878 * [`overflowing_abs`]
7879 * [`RefCell::try_borrow`]
7880 * [`RefCell::try_borrow_mut`]
7885 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7886 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7888 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7889 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7890 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7891 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7892 * [Use arc4rand on FreeBSD][35884]
7893 * [memrchr: Correct aligned offset computation][35969]
7894 * [Improve Demangling of Rust Symbols][36059]
7895 * [Use monotonic time in condition variables][35048]
7896 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7897 * [Implement conversion traits for `char`][35755]
7898 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7899 * [Zero first byte of CString on drop][36264]
7900 * [Inherit overflow checks for sum and product][36372]
7901 * [Add missing Eq implementations][36423]
7902 * [Implement `Debug` for `DirEntry`][36631]
7903 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7905 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7906 * [Implement more traits for `std::io::ErrorKind`][35911]
7907 * [Optimize BinaryHeap bounds checking][36072]
7908 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7909 `extend_with_element`][36355]
7910 * [Fix overflow checking in unsigned pow()][34942]
7915 * This release includes security fixes to both curl and OpenSSL.
7916 * [Fix transitive doctests when panic=abort][cargo/3021]
7917 * [Add --all-features flag to cargo][cargo/3038]
7918 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7919 * [Don't parse the home directory more than once][cargo/3078]
7920 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7921 * [Update OpenSSL to 1.0.2j][cargo/3121]
7922 * [Add license and license_file to cargo metadata output][cargo/3110]
7923 * [Make crates-io registry URL optional in config; ignore all changes to
7924 source.crates-io][cargo/3089]
7925 * [Don't download dependencies from other platforms][cargo/3123]
7926 * [Build transitive dev-dependencies when needed][cargo/3125]
7927 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7928 * [Avoid updating registry when adding existing deps][cargo/3144]
7929 * [Warn about path overrides that won't work][cargo/3136]
7930 * [Use workspaces during `cargo install`][cargo/3146]
7931 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7932 * [Add --message-format flag][cargo/3000]
7933 * [Pass target environment for rustdoc][cargo/3205]
7934 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7935 * [Update curl and curl-sys][cargo/3241]
7936 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7941 * [rustdoc: Add the `--sysroot` argument][36586]
7942 * [rustdoc: Fix a couple of issues with the search results][35655]
7943 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7944 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7945 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7950 * [Remove unmaintained style guide][35124]
7951 * [Add s390x support][36369]
7952 * [Initial work at Haiku OS support][36727]
7953 * [Add mips-uclibc targets][35734]
7954 * [Crate-ify compiler-rt into compiler-builtins][35021]
7955 * [Add rustc version info (git hash + date) to dist tarball][36213]
7956 * Many documentation improvements
7961 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7962 * [Deny (by default) transmuting from fn item types to pointer-sized
7963 types][34923]. Continuing the long transition to zero-sized fn items,
7965 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7967 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7968 * [Fix lifetime rules for 'if' conditions][36029].
7969 * [Inherit overflow checks for sum and product][36372].
7970 * [Forbid user-defined macros named "macro_rules"][36730].
7972 [33922]: https://github.com/rust-lang/rust/pull/33922
7973 [34623]: https://github.com/rust-lang/rust/pull/34623
7974 [34923]: https://github.com/rust-lang/rust/pull/34923
7975 [34942]: https://github.com/rust-lang/rust/pull/34942
7976 [35021]: https://github.com/rust-lang/rust/pull/35021
7977 [35048]: https://github.com/rust-lang/rust/pull/35048
7978 [35074]: https://github.com/rust-lang/rust/pull/35074
7979 [35124]: https://github.com/rust-lang/rust/pull/35124
7980 [35234]: https://github.com/rust-lang/rust/pull/35234
7981 [35238]: https://github.com/rust-lang/rust/pull/35238
7982 [35354]: https://github.com/rust-lang/rust/pull/35354
7983 [35559]: https://github.com/rust-lang/rust/pull/35559
7984 [35585]: https://github.com/rust-lang/rust/pull/35585
7985 [35627]: https://github.com/rust-lang/rust/pull/35627
7986 [35655]: https://github.com/rust-lang/rust/pull/35655
7987 [35702]: https://github.com/rust-lang/rust/pull/35702
7988 [35707]: https://github.com/rust-lang/rust/pull/35707
7989 [35728]: https://github.com/rust-lang/rust/pull/35728
7990 [35734]: https://github.com/rust-lang/rust/pull/35734
7991 [35755]: https://github.com/rust-lang/rust/pull/35755
7992 [35761]: https://github.com/rust-lang/rust/pull/35761
7993 [35764]: https://github.com/rust-lang/rust/pull/35764
7994 [35814]: https://github.com/rust-lang/rust/pull/35814
7995 [35854]: https://github.com/rust-lang/rust/pull/35854
7996 [35871]: https://github.com/rust-lang/rust/pull/35871
7997 [35884]: https://github.com/rust-lang/rust/pull/35884
7998 [35911]: https://github.com/rust-lang/rust/pull/35911
7999 [35969]: https://github.com/rust-lang/rust/pull/35969
8000 [35975]: https://github.com/rust-lang/rust/pull/35975
8001 [36004]: https://github.com/rust-lang/rust/pull/36004
8002 [36008]: https://github.com/rust-lang/rust/pull/36008
8003 [36014]: https://github.com/rust-lang/rust/pull/36014
8004 [36029]: https://github.com/rust-lang/rust/pull/36029
8005 [36059]: https://github.com/rust-lang/rust/pull/36059
8006 [36072]: https://github.com/rust-lang/rust/pull/36072
8007 [36101]: https://github.com/rust-lang/rust/pull/36101
8008 [36104]: https://github.com/rust-lang/rust/pull/36104
8009 [36171]: https://github.com/rust-lang/rust/pull/36171
8010 [36173]: https://github.com/rust-lang/rust/pull/36173
8011 [36178]: https://github.com/rust-lang/rust/pull/36178
8012 [36213]: https://github.com/rust-lang/rust/pull/36213
8013 [36214]: https://github.com/rust-lang/rust/pull/36214
8014 [36264]: https://github.com/rust-lang/rust/pull/36264
8015 [36266]: https://github.com/rust-lang/rust/pull/36266
8016 [36289]: https://github.com/rust-lang/rust/pull/36289
8017 [36338]: https://github.com/rust-lang/rust/pull/36338
8018 [36351]: https://github.com/rust-lang/rust/pull/36351
8019 [36355]: https://github.com/rust-lang/rust/pull/36355
8020 [36369]: https://github.com/rust-lang/rust/pull/36369
8021 [36372]: https://github.com/rust-lang/rust/pull/36372
8022 [36423]: https://github.com/rust-lang/rust/pull/36423
8023 [36482]: https://github.com/rust-lang/rust/pull/36482
8024 [36505]: https://github.com/rust-lang/rust/pull/36505
8025 [36524]: https://github.com/rust-lang/rust/pull/36524
8026 [36527]: https://github.com/rust-lang/rust/pull/36527
8027 [36551]: https://github.com/rust-lang/rust/pull/36551
8028 [36574]: https://github.com/rust-lang/rust/pull/36574
8029 [36586]: https://github.com/rust-lang/rust/pull/36586
8030 [36592]: https://github.com/rust-lang/rust/pull/36592
8031 [36631]: https://github.com/rust-lang/rust/pull/36631
8032 [36721]: https://github.com/rust-lang/rust/pull/36721
8033 [36727]: https://github.com/rust-lang/rust/pull/36727
8034 [36730]: https://github.com/rust-lang/rust/pull/36730
8035 [36734]: https://github.com/rust-lang/rust/pull/36734
8036 [36754]: https://github.com/rust-lang/rust/pull/36754
8037 [36995]: https://github.com/rust-lang/rust/pull/36995
8038 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
8039 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
8040 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
8041 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
8042 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
8043 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
8044 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
8045 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
8046 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
8047 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
8048 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
8049 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
8050 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
8051 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
8052 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
8053 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
8054 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
8055 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
8056 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
8057 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
8058 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
8059 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
8060 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
8061 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
8062 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
8063 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
8064 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
8065 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
8066 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
8067 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
8068 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
8069 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
8072 Version 1.12.1 (2016-10-20)
8073 ===========================
8078 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
8079 * [Confusion with double negation and booleans][36856]
8080 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
8081 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
8082 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
8083 * [Corrupted memory after updated to 1.12][36936]
8084 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
8085 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
8086 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
8088 [36381]: https://github.com/rust-lang/rust/issues/36381
8089 [36856]: https://github.com/rust-lang/rust/issues/36856
8090 [36875]: https://github.com/rust-lang/rust/issues/36875
8091 [36924]: https://github.com/rust-lang/rust/issues/36924
8092 [36926]: https://github.com/rust-lang/rust/issues/36926
8093 [36936]: https://github.com/rust-lang/rust/issues/36936
8094 [37026]: https://github.com/rust-lang/rust/issues/37026
8095 [37112]: https://github.com/rust-lang/rust/issues/37112
8096 [37153]: https://github.com/rust-lang/rust/issues/37153
8099 Version 1.12.0 (2016-09-29)
8100 ===========================
8105 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8106 This translation pass is far simpler than the previous AST->LLVM pass, and
8107 creates opportunities to perform new optimizations directly on the MIR. It
8108 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8109 * [`rustc` presents a new, more readable error format, along with
8110 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8111 Most common editors supporting Rust have been updated to work with it. It was
8112 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8117 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8118 This translation pass is far simpler than the previous AST->LLVM pass, and
8119 creates opportunities to perform new optimizations directly on the MIR. It
8120 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8121 * [Print the Rust target name, not the LLVM target name, with
8122 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8123 * [The computation of `TypeId` is correct in some cases where it was previously
8124 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8125 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8126 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8127 `--print relocation-models`, and `--print code-models` print the available
8128 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8129 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8130 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8131 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8132 These targets produce statically-linked binaries. There are no binary release
8138 * [`rustc` presents a new, more readable error format, along with
8139 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8140 Most common editors supporting Rust have been updated to work with it. It was
8141 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8142 * [In error descriptions, references are now described in plain English,
8143 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8144 * [In error type descriptions, unknown numeric types are named `{integer}` or
8145 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8146 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8151 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8152 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8153 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8154 useful](https://github.com/rust-lang/rust/pull/34908)
8155 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8156 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8157 * [Semicolons are properly required as statement delimiters inside
8158 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8159 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8164 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8165 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8166 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8167 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8168 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8169 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8170 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8171 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8172 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8173 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8174 Both on Unix and Windows.
8175 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8176 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8177 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8178 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8179 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8180 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8181 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8182 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8187 * [The `format!` macro and friends now allow a single argument to be formatted
8188 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8189 * [The lifetime bounds on `[T]::binary_search_by` and
8190 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8191 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8192 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8193 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8194 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8195 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8196 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8197 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8198 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8199 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8200 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8201 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8202 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8203 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8204 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8205 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8206 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8207 * [`mpsc::sync_channel` `Receiver`s return any available message before
8208 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8209 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8210 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8215 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8216 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8217 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8218 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8219 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8220 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8221 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8222 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8223 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8224 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8225 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8226 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8227 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8228 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8229 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8230 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8235 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8236 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8241 * [Test binaries now support a `--test-threads` argument to specify the number
8242 of threads used to run tests, and which acts the same as the
8243 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8244 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8245 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8246 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8247 * [Rust releases now come with source packages that can be installed by rustup
8248 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8249 The resulting source code can be used by tools and IDES, located in the
8250 sysroot under `lib/rustlib/src`.
8255 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8256 * Many minor improvements to the documentation.
8257 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8262 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8263 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8264 * [When formatting strings, if "precision" is specified, the "fill",
8265 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8266 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8269 Version 1.11.0 (2016-08-18)
8270 ===========================
8275 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8276 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8277 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8278 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8283 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8284 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8285 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8286 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8287 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8288 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8289 (in libcore - previously stabilized in libstd)
8290 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8291 (in libcore - previously stabilized in libstd)
8292 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8293 (in libcore - previously stabilized in libstd)
8294 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8295 (in libcore - previously stabilized in libstd)
8296 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8297 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8298 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8299 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8304 * [The `thread_local!` macro supports multiple definitions in a single
8305 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8306 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8307 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8308 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8309 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8310 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8311 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8312 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8317 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8318 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8319 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8320 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8321 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8322 and `-vv` prints warnings for all crates.
8323 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8324 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8325 This provides room for expansion by arbitrary tools.
8326 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8327 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8328 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8329 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8330 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8331 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8332 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8337 * [Caching projections speeds up type check dramatically for some
8338 workloads](https://github.com/rust-lang/rust/pull/33816)
8339 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8340 This hasher is faster, but is believed to provide sufficient
8341 protection from collision attacks.
8342 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8347 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8348 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8349 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8350 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8351 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8356 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8357 * [When emitting debug info, rustc emits frame pointers for closures,
8358 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8359 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8360 * Many more errors have been given error codes and extended
8362 * API documentation continues to be improved, with many new examples
8367 * [rustc no longer hangs when dependencies recursively re-export
8368 submodules](https://github.com/rust-lang/rust/pull/34542)
8369 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8370 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8371 rewritten](https://github.com/rust-lang/rust/pull/33895)
8372 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8373 No targets use this yet, but it works toward AVR support.
8378 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8379 * [The new follow-set rules that place restrictions on `macro_rules!`
8380 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8381 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8382 and has been a warning since 1.10.
8383 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8384 This causes breakage in some corner cases.
8387 Version 1.10.0 (2016-07-07)
8388 ===========================
8393 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8394 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8395 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8396 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8397 * [`panic!` can be converted to a runtime abort with the
8398 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8399 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8400 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8401 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8402 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8403 Note that Cargo does not yet directly support cdylibs.
8408 * `os::windows::fs::OpenOptionsExt::access_mode`
8409 * `os::windows::fs::OpenOptionsExt::share_mode`
8410 * `os::windows::fs::OpenOptionsExt::custom_flags`
8411 * `os::windows::fs::OpenOptionsExt::attributes`
8412 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8413 * `os::unix::fs::OpenOptionsExt::custom_flags`
8414 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8415 * `Default for sync::Weak`
8416 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8417 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8418 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8419 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8420 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8421 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8422 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8423 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8424 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8425 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8426 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8427 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8428 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8429 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8430 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8431 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8432 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8433 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8434 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8435 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8436 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8437 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8438 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8439 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8440 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8441 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8442 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8443 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8444 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8445 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8446 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8447 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8448 * Read/Write/RawFd impls for `UnixStream`
8449 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8450 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8451 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8452 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8453 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8454 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8455 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8456 * RawFd impls for `UnixListener`
8457 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8458 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8459 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8460 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8461 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8462 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8463 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8464 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8465 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8466 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8467 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8468 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8469 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8470 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8471 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8472 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8473 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8474 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8475 * RawFd impls for `UnixDatagram`
8476 * `{BTree,Hash}Map::values_mut`
8477 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8482 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8483 The semantics of this minor method are subtle and probably not what
8485 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8486 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8487 will fall back to `/dev/urandom` temporarily to avoid blocking
8488 during early boot](https://github.com/rust-lang/rust/pull/33086).
8489 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8490 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8491 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8492 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8493 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8494 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8495 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8499 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8500 This controls the runtime behavior of the `panic!` macro
8501 and can be either "unwind" (the default), or "abort".
8502 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8503 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8504 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8505 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8506 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8507 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8508 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8509 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8510 By default they are retried twice, which can be customized with the
8511 `net.retry` value in `.cargo/config`.
8512 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8513 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8514 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8515 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8516 Makes it possible to install multiple crates in parallel.
8517 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8518 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8519 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8520 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8521 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8522 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8527 * [rustc memory usage was reduced by refactoring the context used for
8528 type checking](https://github.com/rust-lang/rust/pull/33425).
8529 * [Speed up creation of `HashMap`s by caching the random keys used
8530 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8531 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8532 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8533 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8534 10x faster than the previous lookup tables.
8535 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8540 * Many incremental improvements to documentation and rustdoc.
8541 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8542 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8543 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8544 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8545 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8546 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8547 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8552 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8553 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8554 * [`std` no longer prints backtraces on platforms where the running
8555 module must be loaded with `env::current_exe`, which can't be relied
8556 on](https://github.com/rust-lang/rust/pull/33554).
8557 * This release includes std binaries for the i586-unknown-linux-gnu,
8558 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8559 i586 target is for old x86 hardware without SSE2, and the armv7
8560 target is for Android running on modern ARM architectures.
8561 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8562 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8563 * [On Unix the runtime aborts by calling `libc::abort` instead of
8564 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8565 * [Rust is now bootstrapped from the previous release of Rust,
8566 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8571 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8572 * [`target_env` for Linux ARM targets is just `gnu`, not
8573 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8574 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8575 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8576 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8577 Affects how macros are parsed.
8578 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8579 * [Feature-gated attributes on macro-generated macro invocations are
8580 now rejected](https://github.com/rust-lang/rust/pull/32791).
8581 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8582 This caused some minor changes to type inference.
8585 Version 1.9.0 (2016-05-26)
8586 ==========================
8591 * The `#[deprecated]` attribute when applied to an API will generate
8592 warnings when used. The warnings may be suppressed with
8593 `#[allow(deprecated)]`. [RFC 1270].
8594 * [`fn` item types are zero sized, and each `fn` names a unique
8595 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8596 `transmute` on a `fn` type will generate a warning for a few cycles,
8597 then will be converted to an error.
8598 * [Field and method resolution understand visibility, so private
8599 fields and methods cannot prevent the proper use of public fields
8600 and methods][1.9fv].
8601 * [The parser considers unicode codepoints in the
8602 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8608 * [`std::panic::catch_unwind`] (renamed from `recover`)
8609 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8610 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8611 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8612 * [`str::is_char_boundary`]
8613 * [`<*const T>::as_ref`]
8614 * [`<*mut T>::as_ref`]
8615 * [`<*mut T>::as_mut`]
8616 * [`AsciiExt::make_ascii_uppercase`]
8617 * [`AsciiExt::make_ascii_lowercase`]
8618 * [`char::decode_utf16`]
8619 * [`char::DecodeUtf16`]
8620 * [`char::DecodeUtf16Error`]
8621 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8622 * [`BTreeSet::take`]
8623 * [`BTreeSet::replace`]
8626 * [`HashSet::replace`]
8628 * [`OsString::with_capacity`]
8629 * [`OsString::clear`]
8630 * [`OsString::capacity`]
8631 * [`OsString::reserve`]
8632 * [`OsString::reserve_exact`]
8633 * [`OsStr::is_empty`]
8635 * [`std::os::unix::thread`]
8638 * [`JoinHandleExt::as_pthread_t`]
8639 * [`JoinHandleExt::into_pthread_t`]
8640 * [`HashSet::hasher`]
8641 * [`HashMap::hasher`]
8642 * [`CommandExt::exec`]
8643 * [`File::try_clone`]
8644 * [`SocketAddr::set_ip`]
8645 * [`SocketAddr::set_port`]
8646 * [`SocketAddrV4::set_ip`]
8647 * [`SocketAddrV4::set_port`]
8648 * [`SocketAddrV6::set_ip`]
8649 * [`SocketAddrV6::set_port`]
8650 * [`SocketAddrV6::set_flowinfo`]
8651 * [`SocketAddrV6::set_scope_id`]
8652 * [`slice::copy_from_slice`]
8653 * [`ptr::read_volatile`]
8654 * [`ptr::write_volatile`]
8655 * [`OpenOptions::create_new`]
8656 * [`TcpStream::set_nodelay`]
8657 * [`TcpStream::nodelay`]
8658 * [`TcpStream::set_ttl`]
8659 * [`TcpStream::ttl`]
8660 * [`TcpStream::set_only_v6`]
8661 * [`TcpStream::only_v6`]
8662 * [`TcpStream::take_error`]
8663 * [`TcpStream::set_nonblocking`]
8664 * [`TcpListener::set_ttl`]
8665 * [`TcpListener::ttl`]
8666 * [`TcpListener::set_only_v6`]
8667 * [`TcpListener::only_v6`]
8668 * [`TcpListener::take_error`]
8669 * [`TcpListener::set_nonblocking`]
8670 * [`UdpSocket::set_broadcast`]
8671 * [`UdpSocket::broadcast`]
8672 * [`UdpSocket::set_multicast_loop_v4`]
8673 * [`UdpSocket::multicast_loop_v4`]
8674 * [`UdpSocket::set_multicast_ttl_v4`]
8675 * [`UdpSocket::multicast_ttl_v4`]
8676 * [`UdpSocket::set_multicast_loop_v6`]
8677 * [`UdpSocket::multicast_loop_v6`]
8678 * [`UdpSocket::set_multicast_ttl_v6`]
8679 * [`UdpSocket::multicast_ttl_v6`]
8680 * [`UdpSocket::set_ttl`]
8681 * [`UdpSocket::ttl`]
8682 * [`UdpSocket::set_only_v6`]
8683 * [`UdpSocket::only_v6`]
8684 * [`UdpSocket::join_multicast_v4`]
8685 * [`UdpSocket::join_multicast_v6`]
8686 * [`UdpSocket::leave_multicast_v4`]
8687 * [`UdpSocket::leave_multicast_v6`]
8688 * [`UdpSocket::take_error`]
8689 * [`UdpSocket::connect`]
8690 * [`UdpSocket::send`]
8691 * [`UdpSocket::recv`]
8692 * [`UdpSocket::set_nonblocking`]
8697 * [`std::sync::Once` is poisoned if its initialization function
8699 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8700 * [Most types implement `fmt::Debug`][1.9db].
8701 * [The default buffer size used by `BufReader` and `BufWriter` was
8702 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8703 used by other languages.
8704 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8705 `Duration` additionally implements `*=` and `/=`][1.9ta].
8706 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8707 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8708 * [`Chain` implements `BufRead`][1.9ch].
8709 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8714 * [Cargo can now run concurrently][1.9cc].
8715 * [Top-level overrides allow specific revisions of crates to be
8716 overridden through the entire crate graph][1.9ct]. This is intended
8717 to make upgrades easier for large projects, by allowing crates to be
8718 forked temporarily until they've been upgraded and republished.
8719 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8720 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8721 on the commandline][1.9cf]. `rustc` arguments can also be specified
8722 in the `build.rustflags` configuration key.
8727 * [The time complexity of comparing variables for equivalence during type
8728 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8729 to major compilation time improvement in some scenarios.
8730 * [`ToString` is specialized for `str`, giving it the same performance
8731 as `to_owned`][1.9ts].
8732 * [Spawning processes with `Command::output` no longer creates extra
8734 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8735 for C-like enums][1.9cl].
8740 * [Passing the `--quiet` flag to a test runner will produce
8741 much-abbreviated output][1.9q].
8742 * The Rust Project now publishes std binaries for the
8743 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8744 `i586-pc-windows-msvc` targets.
8749 * [`std::sync::Once` is poisoned if its initialization function
8751 * [It is illegal to define methods with the same name in overlapping
8752 inherent `impl` blocks][1.9sn].
8753 * [`fn` item types are zero sized, and each `fn` names a unique
8754 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8755 `transmute` on a `fn` type will generate a warning for a few cycles,
8756 then will be converted to an error.
8757 * [Improvements to const evaluation may trigger new errors when integer
8758 literals are out of range][1.9ce].
8761 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8762 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8763 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8764 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8765 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8766 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8767 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8768 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8769 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8770 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8771 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8772 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8773 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8774 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8775 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8776 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8777 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8778 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8779 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8780 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8781 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8782 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8783 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8784 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8785 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8786 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8787 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8788 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8789 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8790 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8791 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8792 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8793 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8794 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8795 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8796 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8797 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8798 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8799 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8800 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8801 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8802 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8803 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8804 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8805 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8806 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8807 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8808 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8809 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8810 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8811 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8812 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8813 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8814 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8815 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8816 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8817 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8818 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8819 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8820 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8821 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8822 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8823 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8824 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8825 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8826 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8827 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8828 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8829 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8830 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8831 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8832 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8833 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8834 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8835 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8836 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8837 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8838 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8839 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8840 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8841 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8842 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8843 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8844 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8845 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8846 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8847 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8848 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8849 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8850 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8851 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8852 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8853 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8854 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8855 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8856 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8857 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8858 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8859 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8860 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8861 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8862 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8863 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8864 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8865 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8866 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8867 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8868 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8869 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8870 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8873 Version 1.8.0 (2016-04-14)
8874 ==========================
8879 * Rust supports overloading of compound assignment statements like
8880 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8881 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8882 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8884 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8885 addition to the non-braced form, `struct Foo;`. [RFC 218].
8891 * [`str::encode_utf16`] (renamed from `utf16_units`)
8892 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8895 * [`ptr::drop_in_place`]
8897 * [`time::SystemTime`]
8899 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8900 * [`Instant::elapsed`]
8901 * [`SystemTime::now`]
8902 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8903 * [`SystemTime::elapsed`]
8904 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8905 * [`SystemTimeError`]
8906 * [`SystemTimeError::duration`]
8907 * Various impls for `SystemTimeError`
8909 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8910 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8911 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8912 * [The `write!` and `writeln!` macros correctly emit errors if any of
8913 their arguments can't be formatted][1.8w].
8914 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8915 * [The Unix-specific `raw` modules, which contain a number of
8916 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8917 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8918 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8919 across platforms was making it difficult to implement `std`
8920 correctly. Those that need these definitions should use the `libc`
8922 * The Unix-specific `MetadataExt` traits, including
8923 `os::unix::fs::MetadataExt`, which expose values such as inode
8924 numbers [no longer return platform-specific types][1.8r], but
8925 instead return widened integers. [RFC 1415].
8926 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8927 * [Atomic loads and stores are not volatile][1.8a].
8928 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8933 * [Inlining hash functions lead to a 3% compile-time improvement in
8934 some workloads][1.8h].
8935 * When using jemalloc, its symbols are [unprefixed so that it
8936 overrides the libc malloc implementation][1.8h]. This means that for
8937 rustc, LLVM is now using jemalloc, which results in a 6%
8938 compile-time improvement on a specific workload.
8939 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8944 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8945 i686-pc-windows-msvc is now considered a tier-1 platform.
8946 * [The `--print targets` flag prints a list of supported targets][1.8t].
8947 * [The `--print cfg` flag prints the `cfg`s defined for the current
8949 * [`rustc` can be built with an new Cargo-based build system, written
8950 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8951 build system. To enable it configure with `configure --rustbuild`.
8952 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8953 variants while also indicating the total number of missing variants
8954 if more than 3][1.8m].
8955 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8956 * The Rust Project now publishes binary releases of the standard
8957 library for a number of tier-2 targets:
8958 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8959 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8960 `x86_64-rumprun-netbsd`. These can be installed with
8961 tools such as [multirust][1.8mr].
8966 * [`cargo init` creates a new Cargo project in the current
8967 directory][1.8ci]. It is otherwise like `cargo new`.
8968 * [Cargo has configuration keys for `-v` and
8969 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8970 `[term]` section of `.cargo/config`.
8971 * [Configuration keys that evaluate to strings or integers can be set
8972 via environment variables][1.8ce]. For example the `build.jobs` key
8973 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8974 precedence over config files.
8975 * [Target-specific dependencies support Rust `cfg` syntax for
8976 describing targets][1.8cfg] so that dependencies for multiple
8977 targets can be specified together. [RFC 1361].
8978 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8979 `RUSTDOC` take precedence over the `build.target-dir`,
8980 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8981 * [The child process tree is killed on Windows when Cargo is
8983 * [The `build.target` configuration value sets the target platform,
8984 like `--target`][1.8ct].
8989 * [Unstable compiler flags have been further restricted][1.8u]. Since
8990 1.0 `-Z` flags have been considered unstable, and other flags that
8991 were considered unstable additionally required passing `-Z
8992 unstable-options` to access. Unlike unstable language and library
8993 features though, these options have been accessible on the stable
8994 release channel. Going forward, *new unstable flags will not be
8995 available on the stable release channel*, and old unstable flags
8996 will warn about their usage. In the future, all unstable flags will
8997 be unavailable on the stable release channel.
8998 * [It is no longer possible to `match` on empty enum variants using
8999 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
9000 * The Unix-specific `MetadataExt` traits, including
9001 `os::unix::fs::MetadataExt`, which expose values such as inode
9002 numbers [no longer return platform-specific types][1.8r], but
9003 instead return widened integers. [RFC 1415].
9004 * [Modules sourced from the filesystem cannot appear within arbitrary
9005 blocks, but only within other modules][1.8mf].
9006 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
9007 * On Unix, [stack overflow triggers a runtime abort instead of a
9009 * [`Command::spawn` and its equivalents return an error if any of
9010 its command-line arguments contain interior `NUL`s][1.8n].
9011 * [Tuple and unit enum variants from other crates are in the type
9013 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
9014 type instead of `.a` files][1.8st]. Additionally, for the MSVC
9015 toolchain, `rustc` emits import libraries named `foo.dll.lib`
9016 instead of `foo.lib`.
9019 [1.8a]: https://github.com/rust-lang/rust/pull/30962
9020 [1.8b]: https://github.com/rust-lang/rust/pull/31123
9021 [1.8c]: https://github.com/rust-lang/rust/pull/31530
9022 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
9023 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
9024 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
9025 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
9026 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
9027 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
9028 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
9029 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
9030 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
9031 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
9032 [1.8h]: https://github.com/rust-lang/rust/pull/31460
9033 [1.8l]: https://github.com/rust-lang/rust/pull/31668
9034 [1.8m]: https://github.com/rust-lang/rust/pull/31020
9035 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
9036 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
9037 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
9038 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
9039 [1.8n]: https://github.com/rust-lang/rust/pull/31056
9040 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
9041 [1.8r]: https://github.com/rust-lang/rust/pull/31551
9042 [1.8so]: https://github.com/rust-lang/rust/pull/31333
9043 [1.8st]: https://github.com/rust-lang/rust/pull/29520
9044 [1.8t]: https://github.com/rust-lang/rust/pull/31358
9045 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
9046 [1.8u]: https://github.com/rust-lang/rust/pull/31793
9047 [1.8v]: https://github.com/rust-lang/rust/pull/31757
9048 [1.8w]: https://github.com/rust-lang/rust/pull/31904
9049 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
9050 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
9051 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
9052 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
9053 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
9054 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
9055 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
9056 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
9057 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
9058 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
9059 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
9060 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
9061 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
9062 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
9063 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
9064 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
9065 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
9066 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
9067 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
9068 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
9069 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
9070 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
9071 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
9072 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
9073 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
9074 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
9075 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
9076 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
9077 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
9078 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
9081 Version 1.7.0 (2016-03-03)
9082 ==========================
9089 * [`Path::strip_prefix`] (renamed from relative_from)
9090 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
9092 * [`Ipv4Addr::is_loopback`]
9093 * [`Ipv4Addr::is_private`]
9094 * [`Ipv4Addr::is_link_local`]
9095 * [`Ipv4Addr::is_multicast`]
9096 * [`Ipv4Addr::is_broadcast`]
9097 * [`Ipv4Addr::is_documentation`]
9099 * [`Ipv6Addr::is_unspecified`]
9100 * [`Ipv6Addr::is_loopback`]
9101 * [`Ipv6Addr::is_multicast`]
9104 * [`Vec::as_mut_slice`]
9106 * [`String::as_str`]
9107 * [`String::as_mut_str`]
9109 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9111 * `<[T]>::`[`sort_by_key`]
9112 * checked, saturated, and overflowing operations
9113 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9114 * [`i32::saturating_mul`]
9115 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9116 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9117 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9118 * [`u32::saturating_mul`]
9119 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9120 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9121 * and checked, saturated, and overflowing operations for other primitive types
9123 * [`ffi::IntoStringError`]
9124 * [`CString::into_string`]
9125 * [`CString::into_bytes`]
9126 * [`CString::into_bytes_with_nul`]
9127 * `From<CString> for Vec<u8>`
9129 * [`IntoStringError::into_cstring`]
9130 * [`IntoStringError::utf8_error`]
9131 * `Error for IntoStringError`
9133 * [`std::hash::BuildHasher`]
9134 * [`BuildHasher::Hasher`]
9135 * [`BuildHasher::build_hasher`]
9136 * [`std::hash::BuildHasherDefault`]
9137 * [`HashMap::with_hasher`]
9138 * [`HashMap::with_capacity_and_hasher`]
9139 * [`HashSet::with_hasher`]
9140 * [`HashSet::with_capacity_and_hasher`]
9141 * [`std::collections::hash_map::RandomState`]
9142 * [`RandomState::new`]
9143 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9144 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9145 from bytes is faster.
9146 * [The performance of `LineWriter` (and thus `io::stdout`) was
9147 improved by using `memchr` to search for newlines][1.7m].
9148 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9149 `f64` variants were stabilized previously.
9150 * [`BTreeMap` was rewritten to use less memory and improve the performance
9151 of insertion and iteration, the latter by as much as 5x][1.7bm].
9152 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9153 covariant over their contained type][1.7bt].
9154 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9155 over their contained type][1.7ll].
9156 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9158 * [`Any` is implemented for unsized types][1.7a].
9159 * [`Hash` is implemented for `Duration`][1.7h].
9164 * [When running tests with `--test`, rustdoc will pass `--cfg`
9165 arguments to the compiler][1.7dt].
9166 * [The compiler is built with RPATH information by default][1.7rpa].
9167 This means that it will be possible to run `rustc` when installed in
9168 unusual configurations without configuring the dynamic linker search
9170 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9171 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9172 over `LD_LIBRARY_PATH`.
9177 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9178 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9179 * [The `rerun-if-changed` build script directive no longer causes the
9180 build script to incorrectly run twice in certain scenarios][1.7rr].
9185 * Soundness fixes to the interactions between associated types and
9186 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9187 code that violates the new rules. This is a significant change that
9188 is known to break existing code, so it has emitted warnings for the
9189 new error cases since 1.4 to give crate authors time to adapt. The
9190 details of what is changing are subtle; read the RFC for more.
9191 * [Several bugs in the compiler's visibility calculations were
9192 fixed][1.7v]. Since this was found to break significant amounts of
9193 code, the new errors will be emitted as warnings for several release
9194 cycles, under the `private_in_public` lint.
9195 * Defaulted type parameters were accidentally accepted in positions
9196 that were not intended. In this release, [defaulted type parameters
9197 appearing outside of type definitions will generate a
9198 warning][1.7d], which will become an error in future releases.
9199 * [Parsing "." as a float results in an error instead of 0][1.7p].
9200 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9201 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9203 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9204 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9205 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9206 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9207 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9208 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9209 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9210 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9211 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9212 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9213 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9214 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9215 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9216 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9217 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9218 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9219 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9220 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9221 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9222 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9223 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9224 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9225 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9226 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9227 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9228 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9229 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9230 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9231 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9232 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9233 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9234 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9235 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9236 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9237 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9238 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9239 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9240 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9241 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9242 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9243 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9244 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9245 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9246 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9247 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9248 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9249 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9250 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9251 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9252 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9253 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9254 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9255 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9256 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9257 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9258 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9259 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9260 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9261 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9262 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9263 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9264 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9265 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9266 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9267 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9268 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9269 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9270 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9271 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9272 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9273 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9274 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9275 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9276 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9277 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9278 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9279 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9280 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9281 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9284 Version 1.6.0 (2016-01-21)
9285 ==========================
9290 * The `#![no_std]` attribute causes a crate to not be linked to the
9291 standard library, but only the [core library][1.6co], as described
9292 in [RFC 1184]. The core library defines common types and traits but
9293 has no platform dependencies whatsoever, and is the basis for Rust
9294 software in environments that cannot support a full port of the
9295 standard library, such as operating systems. Most of the core
9296 library is now stable.
9302 [`Read::read_exact`],
9303 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9304 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9305 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9306 [`os::unix::fs::DirBuilderExt`],
9307 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9308 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9309 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9310 [`collections::hash_map::Drain`],
9311 [`collections::hash_map::HashMap::drain`],
9312 [`collections::hash_set::Drain`],
9313 [`collections::hash_set::HashSet::drain`],
9314 [`collections::binary_heap::Drain`],
9315 [`collections::binary_heap::BinaryHeap::drain`],
9316 [`Vec::extend_from_slice`] (renamed from `push_all`),
9317 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9318 [`RwLock::into_inner`],
9319 [`Iterator::min_by_key`] (renamed from `min_by`),
9320 [`Iterator::max_by_key`] (renamed from `max_by`).
9321 * The [core library][1.6co] is stable, as are most of its APIs.
9322 * [The `assert_eq!` macro supports arguments that don't implement
9323 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9325 * Several timer functions that take duration in milliseconds [are
9326 deprecated in favor of those that take `Duration`][1.6ms]. These
9327 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9328 `thread::park_timeout_ms`.
9329 * The algorithm by which `Vec` reserves additional elements was
9330 [tweaked to not allocate excessive space][1.6a] while still growing
9332 * `From` conversions are [implemented from integers to floats][1.6f]
9333 in cases where the conversion is lossless. Thus they are not
9334 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9335 or `f64`. They are also not implemented for `isize` and `usize`
9336 because the implementations would be platform-specific. `From` is
9337 also implemented from `f32` to `f64`.
9338 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9339 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9340 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9341 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9343 * Sorting slices that are already sorted [is 50% faster in some
9349 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9350 * Cargo build scripts can specify their dependencies by emitting the
9351 [`rerun-if-changed`][1.6rr] key.
9352 * crates.io will reject publication of crates with dependencies that
9353 have a wildcard version constraint. Crates with wildcard
9354 dependencies were seen to cause a variety of problems, as described
9355 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9357 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9358 release folder. A variety of artifacts that Cargo failed to clean
9359 are now correctly deleted.
9364 * The `unreachable_code` lint [warns when a function call's argument
9366 * The parser indicates [failures that may be caused by
9367 confusingly-similar Unicode characters][1.6uc]
9368 * Certain macro errors [are reported at definition time][1.6m], not
9374 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9375 environment variable when locating crates. This was a pre-cargo
9376 feature for integrating with the package manager that was
9377 accidentally never removed.
9378 * [A number of bugs were fixed in the privacy checker][1.6p] that
9379 could cause previously-accepted code to break.
9380 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9381 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9382 struct pattern syntax (`Foo(..)`) can no longer be used to match
9383 unit structs. This is a warning now, but will become an error in
9384 future releases. Patterns that share the same name as a const are
9386 * A bug was fixed that causes [rustc not to apply default type
9387 parameters][1.6xc] when resolving certain method implementations of
9388 traits defined in other crates.
9390 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9391 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9392 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9393 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9394 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9395 [1.6co]: http://doc.rust-lang.org/core/index.html
9396 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9397 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9398 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9399 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9400 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9401 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9402 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9403 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9404 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9405 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9406 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9407 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9408 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9409 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9410 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9411 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9412 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9413 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9414 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9415 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9416 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9417 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9418 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9419 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9420 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9421 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9422 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9423 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9424 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9425 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9426 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9427 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9428 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9429 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9430 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9431 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9432 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9433 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9434 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9435 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9436 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9439 Version 1.5.0 (2015-12-10)
9440 ==========================
9442 * ~700 changes, numerous bugfixes
9448 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9449 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9450 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9451 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9452 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9453 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9454 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9455 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9456 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9457 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9458 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9459 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9460 [`Path::read_link`], [`Path::symlink_metadata`],
9461 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9462 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9463 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9464 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9465 [`slice::split_first_mut`], [`slice::split_first`],
9466 [`slice::split_last_mut`], [`slice::split_last`],
9467 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9468 [`str::MatchIndices`], [`str::RMatchIndices`],
9469 [`str::match_indices`], [`str::rmatch_indices`],
9470 [`str::slice_mut_unchecked`], [`string::ParseError`].
9471 * Rust applications hosted on crates.io can be installed locally to
9472 `~/.cargo/bin` with the [`cargo install`] command. Among other
9473 things this makes it easier to augment Cargo with new subcommands:
9474 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9475 invoked as `cargo foo`.
9476 * Crates with wildcard (`*`) dependencies will [emit warnings when
9477 published][1.5w]. In 1.6 it will no longer be possible to publish
9478 crates with wildcard dependencies.
9483 * The rules determining when a particular lifetime must outlive
9484 a particular value (known as '[dropck]') have been [modified
9485 to not rely on parametricity][1.5p].
9486 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9487 and `Arc`][1.5a]. Because these smart pointer types implement
9488 `Deref`, this causes breakage in cases where the interior type
9489 contains methods of the same name.
9490 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9491 that they could drop their content. Soundness fix.
9492 * All method invocations are [properly checked][1.5wf1] for
9493 [well-formedness][1.5wf2]. Soundness fix.
9494 * Traits whose supertraits contain `Self` are [not object
9495 safe][1.5o]. Soundness fix.
9496 * Target specifications support a [`no_default_libraries`][1.5nd]
9497 setting that controls whether `-nodefaultlibs` is passed to the
9498 linker, and in turn the `is_like_windows` setting no longer affects
9499 the `-nodefaultlibs` flag.
9500 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9501 * The `#[inline]` and `#[repr]` attributes [can only appear
9502 in valid locations][1.5at].
9503 * Native libraries linked from the local crate are [passed to
9504 the linker before native libraries from upstream crates][1.5nl].
9505 * Two rarely-used attributes, `#[no_debug]` and
9506 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9507 * Negation of unsigned integers, which has been a warning for
9508 several releases, [is now behind a feature gate and will
9509 generate errors][1.5nu].
9510 * The parser accidentally accepted visibility modifiers on
9511 enum variants, a bug [which has been fixed][1.5ev].
9512 * [A bug was fixed that allowed `use` statements to import unstable
9518 * When evaluating expressions at compile-time that are not
9519 compile-time constants (const-evaluating expressions in non-const
9520 contexts), incorrect code such as overlong bitshifts and arithmetic
9521 overflow will [generate a warning instead of an error][1.5ce],
9522 delaying the error until runtime. This will allow the
9523 const-evaluator to be expanded in the future backwards-compatibly.
9524 * The `improper_ctypes` lint [no longer warns about using `isize` and
9525 `usize` in FFI][1.5ict].
9530 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9532 * `Default` is [implemented for mutable slices][1.5d].
9533 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9534 * There are now `From` conversions [between floating point
9535 types][1.5f] where the conversions are lossless.
9536 * There are now `From` conversions [between integer types][1.5i] where
9537 the conversions are lossless.
9538 * [`fs::Metadata` implements `Clone`][1.5fs].
9539 * The `parse` method [accepts a leading "+" when parsing
9541 * [`AsMut` is implemented for `Vec`][1.5am].
9542 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9543 been optimized][1.5cf] and no longer rely on the default impl.
9544 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9545 `unsafe extern "C"` function types now [implement `Clone`,
9546 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9547 `fmt::Debug` for up to 12 arguments][1.5fp].
9548 * [Dropping `Vec`s is much faster in unoptimized builds when the
9549 element types don't implement `Drop`][1.5dv].
9550 * A bug that caused in incorrect behavior when [combining `VecDeque`
9551 with zero-sized types][1.5vdz] was resolved.
9552 * [`PartialOrd` for slices is faster][1.5po].
9557 * [Crate metadata size was reduced by 20%][1.5md].
9558 * [Improvements to code generation reduced the size of libcore by 3.3
9559 MB and rustc's memory usage by 18MB][1.5m].
9560 * [Improvements to deref translation increased performance in
9561 unoptimized builds][1.5dr].
9562 * Various errors in trait resolution [are deduplicated to only be
9563 reported once][1.5te].
9564 * Rust has preliminary [support for rumprun kernels][1.5rr].
9565 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9567 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9568 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9569 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9570 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9571 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9572 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9573 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9574 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9575 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9576 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9577 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9578 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9579 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9580 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9581 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9582 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9583 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9584 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9585 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9586 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9587 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9588 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9589 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9590 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9591 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9592 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9593 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9594 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9595 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9596 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9597 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9598 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9599 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9600 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9601 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9602 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9603 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9604 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9605 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9606 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9607 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9608 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9609 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9610 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9611 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9612 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9613 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9614 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9615 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9616 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9617 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9618 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9619 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9620 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9621 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9622 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9623 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9624 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9625 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9626 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9627 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9628 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9629 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9630 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9631 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9632 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9633 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9634 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9635 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9636 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9637 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9638 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9639 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9640 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9641 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9642 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9643 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9644 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9645 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9646 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9647 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9648 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9649 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9650 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9651 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9652 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9653 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9654 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9655 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9657 Version 1.4.0 (2015-10-29)
9658 ==========================
9660 * ~1200 changes, numerous bugfixes
9665 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9666 GNU) are now supported and recommended for use.
9671 * [Several changes have been made to fix type soundness and improve
9672 the behavior of associated types][sound]. See [RFC 1214]. Although
9673 we have mostly introduced these changes as warnings this release, to
9674 become errors next release, there are still some scenarios that will
9675 see immediate breakage.
9676 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9677 line breaks in addition to `\n`][crlf].
9678 * [Loans of `'static` lifetime extend to the end of a function][stat].
9679 * [`str::parse` no longer introduces avoidable rounding error when
9680 parsing floating point numbers. Together with earlier changes to
9681 float formatting/output, "round trips" like f.to_string().parse()
9682 now preserve the value of f exactly. Additionally, leading plus
9683 signs are now accepted][fp3].
9689 * `use` statements that import multiple items [can now rename
9690 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9691 * [Binops work correctly on fat pointers][binfat].
9692 * `pub extern crate`, which does not behave as expected, [issues a
9693 warning][pec] until a better solution is found.
9698 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9699 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9700 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9701 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9702 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9703 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9704 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9705 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9706 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9707 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9708 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9709 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9710 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9711 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9712 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9713 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9714 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9715 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9717 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9718 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9719 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9720 `f64::from_str_radix`.
9721 * [Reverse-searching strings is faster with the 'two-way'
9723 * [`std::io::copy` allows `?Sized` arguments][cc].
9724 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9725 [override `count`, `nth` and `last` with an *O*(1)
9726 implementation][it].
9727 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9728 * [`IntoRawFd` has been added to the Unix-specific prelude,
9729 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9731 * [`Extend<String>` and `FromIterator<String` are both implemented for
9733 * [`IntoIterator` is implemented for references to `Option` and
9735 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9736 Copy`][ext] as part of [RFC 839]. This will cause type inference
9737 breakage in rare situations.
9738 * [`BinaryHeap` implements `Debug`][bh2].
9739 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9741 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9742 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9743 * [String comparison is faster][faststr].
9744 * `&mut T` where `T: std::fmt::Write` [also implements
9745 `std::fmt::Write`][mutw].
9746 * [A stable regression in `VecDeque::push_back` and other
9747 capacity-altering methods that caused panics for zero-sized types
9749 * [Function pointers implement traits for up to 12 parameters][fp2].
9754 * The compiler [no longer uses the 'morestack' feature to prevent
9755 stack overflow][mm]. Instead it uses guard pages and stack
9756 probes (though stack probes are not yet implemented on any platform
9758 * [The compiler matches traits faster when projections are involved][p].
9759 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9761 * [Cargo now displays useful information about what its doing during
9762 `cargo update`][cu].
9764 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9765 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9766 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9767 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9768 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9769 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9770 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9771 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9772 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9773 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9774 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9775 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9776 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9777 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9778 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9779 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9780 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9781 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9782 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9783 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9784 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9785 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9786 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9787 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9788 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9789 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9790 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9791 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9792 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9793 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9794 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9795 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9796 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9797 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9798 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9799 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9800 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9801 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9802 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9803 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9804 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9805 [bh2]: https://github.com/rust-lang/rust/pull/28156
9806 [binfat]: https://github.com/rust-lang/rust/pull/28270
9807 [bm]: https://github.com/rust-lang/rust/pull/28197
9808 [cc]: https://github.com/rust-lang/rust/pull/27531
9809 [crlf]: https://github.com/rust-lang/rust/pull/28034
9810 [cu]: https://github.com/rust-lang/cargo/pull/1931
9811 [d]: https://github.com/rust-lang/rust/pull/27825
9812 [dep]: https://github.com/rust-lang/rust/pull/28339
9813 [es]: https://github.com/rust-lang/rust/pull/27956
9814 [ext]: https://github.com/rust-lang/rust/pull/28094
9815 [faststr]: https://github.com/rust-lang/rust/pull/28338
9816 [ffi]: https://github.com/rust-lang/rust/pull/28779
9817 [fp]: https://github.com/rust-lang/rust/pull/28268
9818 [fp2]: https://github.com/rust-lang/rust/pull/28560
9819 [fp3]: https://github.com/rust-lang/rust/pull/27307
9820 [i]: https://github.com/rust-lang/rust/pull/27451
9821 [into2]: https://github.com/rust-lang/rust/pull/28039
9822 [it]: https://github.com/rust-lang/rust/pull/27652
9823 [mm]: https://github.com/rust-lang/rust/pull/27338
9824 [mutw]: https://github.com/rust-lang/rust/pull/28368
9825 [sound]: https://github.com/rust-lang/rust/pull/27641
9826 [p]: https://github.com/rust-lang/rust/pull/27866
9827 [pec]: https://github.com/rust-lang/rust/pull/28486
9828 [pr]: https://github.com/rust-lang/rust/pull/27896
9829 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9830 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9831 [s]: https://github.com/rust-lang/rust/pull/27474
9832 [stab]: https://github.com/rust-lang/rust/pull/28339
9833 [stat]: https://github.com/rust-lang/rust/pull/28321
9834 [vd]: https://github.com/rust-lang/rust/pull/28494
9836 Version 1.3.0 (2015-09-17)
9837 ==============================
9839 * ~900 changes, numerous bugfixes
9844 * The [new object lifetime defaults][nold] have been [turned
9845 on][nold2] after a cycle of warnings about the change. Now types
9846 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9847 being interpreted as `&'a Box<Trait+'a>` to `&'a
9848 Box<Trait+'static>`.
9849 * [The Rustonomicon][nom] is a new book in the official documentation
9850 that dives into writing unsafe Rust.
9851 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9852 timekeeping is employed by other std APIs, as well as out-of-tree
9858 * The [new object lifetime defaults][nold] have been [turned
9859 on][nold2] after a cycle of warnings about the change.
9860 * There is a known [regression][lr] in how object lifetime elision is
9861 interpreted, the proper solution for which is undetermined.
9862 * The `#[prelude_import]` attribute, an internal implementation
9863 detail, was accidentally stabilized previously. [It has been put
9864 behind the `prelude_import` feature gate][pi]. This change is
9865 believed to break no existing code.
9866 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9867 [more sane for dynamically sized types][dst3]. Code that relied on
9868 the previous behavior is thought to be broken.
9869 * The `dropck` rules, which checks that destructors can't access
9870 destroyed values, [have been updated][dropck] to match the
9871 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9872 cause some previously-compiling code to no longer build.
9877 * The [new object lifetime defaults][nold] have been [turned
9878 on][nold2] after a cycle of warnings about the change.
9879 * Semicolons may [now follow types and paths in
9880 macros](https://github.com/rust-lang/rust/pull/27000).
9881 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9882 [more sane for dynamically sized types][dst3]. Code that relied on
9883 the previous behavior is not known to exist, and suspected to be
9885 * `'static` variables [may now be recursive][st].
9886 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9887 implementations correctly.
9888 * The `dropck` rules, which checks that destructors can't access
9889 destroyed values, [have been updated][dropck] to match the
9895 * The [`Duration`] API, [has been stabilized][ds], as well as the
9896 `std::time` module, which presently contains only `Duration`.
9897 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9898 * The owned C string, [`CString`], implements [`Borrow`] and the
9899 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9900 these allow C strings to be borrowed and cloned in generic code.
9901 * [`CStr`] implements [`Debug`].
9902 * [`AtomicPtr`] implements [`Debug`].
9903 * [`Error`] trait objects [can be downcast to their concrete types][e]
9904 in many common configurations, using the [`is`], [`downcast`],
9905 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9907 * Searching for substrings now [employs the two-way algorithm][search]
9908 instead of doing a naive search. This gives major speedups to a
9909 number of methods, including [`contains`][sc], [`find`][sf],
9910 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9911 [`ends_with`][sew] are also faster.
9912 * The performance of `PartialEq` for slices is [much faster][ps].
9913 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9914 is overridden and optimized by the implementations for scalars.
9915 * The [`Hasher`] trait now has a number of specialized `write_*`
9916 methods for primitive types, for efficiency.
9917 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9918 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9919 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9920 of [`std::error::Error::cause`][iec] also delegates to the inner
9922 * [`process::Child`][pc] gained the [`id`] method, which returns a
9923 `u32` representing the platform-specific process identifier.
9924 * The [`connect`] method on slices is deprecated, replaced by the new
9925 [`join`] method (note that both of these are on the *unstable*
9926 [`SliceConcatExt`] trait, but through the magic of the prelude are
9927 available to stable code anyway).
9928 * The [`Div`] operator is implemented for [`Wrapping`] types.
9929 * [`DerefMut` is implemented for `String`][dms].
9930 * Performance of SipHash (the default hasher for `HashMap`) is
9931 [better for long data][sh].
9932 * [`AtomicPtr`] implements [`Send`].
9933 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9934 are now [specialized to use uninitialized buffers for increased
9936 * Lifetime parameters of foreign functions [are now resolved
9942 * Rust can now, with some coercion, [produce programs that run on
9943 Windows XP][xp], though XP is not considered a supported platform.
9944 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9945 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9946 recommended for use in 1.3, though should be fully-functional
9947 in the [64-bit 1.4 beta][b14].
9948 * On Fedora-based systems installation will [properly configure the
9949 dynamic linker][fl].
9950 * The compiler gained many new extended error descriptions, which can
9951 be accessed with the `--explain` flag.
9952 * The `dropck` pass, which checks that destructors can't access
9953 destroyed values, [has been rewritten][27261]. This fixes some
9954 soundness holes, and as such will cause some previously-compiling
9955 code to no longer build.
9956 * `rustc` now uses [LLVM to write archive files where possible][ar].
9957 Eventually this will eliminate the compiler's dependency on the ar
9959 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9960 supported FreeBSD on x86_64).
9961 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9962 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9964 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9965 will kill the process instead of leaking][nlp].
9967 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9968 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9969 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9970 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9971 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9972 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9973 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9974 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9975 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9976 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9977 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9978 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9979 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9980 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9981 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9982 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9983 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9984 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9985 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9986 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9987 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9988 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9989 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9990 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9991 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9992 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9993 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9994 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9995 [ar]: https://github.com/rust-lang/rust/pull/26926
9996 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9997 [dms]: https://github.com/rust-lang/rust/pull/26241
9998 [27261]: https://github.com/rust-lang/rust/pull/27261
9999 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10000 [ds]: https://github.com/rust-lang/rust/pull/26818
10001 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
10002 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
10003 [dst3]: https://github.com/rust-lang/rust/pull/27351
10004 [e]: https://github.com/rust-lang/rust/pull/24793
10005 [f]: https://github.com/rust-lang/rust/pull/26588
10006 [26959]: https://github.com/rust-lang/rust/pull/26959
10007 [fl]: https://github.com/rust-lang/rust-installer/pull/41
10008 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
10009 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
10010 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
10011 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
10012 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
10013 [lic]: https://github.com/rust-lang/rust/pull/26583
10014 [lnu]: https://github.com/rust-lang/rust/pull/27026
10015 [lr]: https://github.com/rust-lang/rust/issues/27248
10016 [lum]: https://github.com/rust-lang/rust/pull/26378
10017 [lur]: https://github.com/rust-lang/rust/pull/26783
10018 [nlp]: https://github.com/rust-lang/rust/pull/27176
10019 [nold2]: https://github.com/rust-lang/rust/pull/27045
10020 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
10021 [nom]: http://doc.rust-lang.org/nightly/nomicon/
10022 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
10023 [pi]: https://github.com/rust-lang/rust/pull/26699
10024 [ps]: https://github.com/rust-lang/rust/pull/26884
10025 [rte]: https://github.com/rust-lang/rust/pull/26950
10026 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
10027 [search]: https://github.com/rust-lang/rust/pull/26327
10028 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
10029 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
10030 [sh]: https://github.com/rust-lang/rust/pull/27280
10031 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
10032 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
10033 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
10034 [st]: https://github.com/rust-lang/rust/pull/26630
10035 [win1]: https://github.com/rust-lang/rust/pull/26569
10036 [win2]: https://github.com/rust-lang/rust/pull/26741
10037 [win3]: https://github.com/rust-lang/rust/pull/26741
10038 [win4]: https://github.com/rust-lang/rust/pull/27210
10039 [xp]: https://github.com/rust-lang/rust/pull/26569
10041 Version 1.2.0 (2015-08-07)
10042 ==========================
10044 * ~1200 changes, numerous bugfixes
10049 * [Dynamically-sized-type coercions][dst] allow smart pointer types
10050 like `Rc` to contain types without a fixed size, arrays and trait
10051 objects, finally enabling use of `Rc<[T]>` and completing the
10052 implementation of DST.
10053 * [Parallel codegen][parcodegen] is now working again, which can
10054 substantially speed up large builds in debug mode; It also gets
10055 another ~33% speedup when bootstrapping on a 4 core machine (using 8
10056 jobs). It's not enabled by default, but will be "in the near
10057 future". It can be activated with the `-C codegen-units=N` flag to
10059 * This is the first release with [experimental support for linking
10060 with the MSVC linker and lib C on Windows (instead of using the GNU
10061 variants via MinGW)][win]. It is yet recommended only for the most
10062 intrepid Rustaceans.
10063 * Benchmark compilations are showing a 30% improvement in
10064 bootstrapping over 1.1.
10069 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
10070 unicode case mapping, which is a previously-planned change in
10071 behavior and considered a bugfix.
10072 * [`mem::align_of`] now specifies [the *minimum alignment* for
10073 T][align], which is usually the alignment programs are interested
10074 in, and the same value reported by clang's
10075 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
10077 * [The `#[packed]` attribute is no longer silently accepted by the
10078 compiler][packed]. This attribute did nothing and code that
10079 mentioned it likely did not work as intended.
10080 * Associated type defaults are [now behind the
10081 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
10082 defaults *did not work*, but could be mentioned syntactically. As
10083 such this breakage has minimal impact.
10088 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
10089 matching against dereferenceable values.
10094 * The [`Extend`] trait, which grows a collection from an iterator, is
10095 implemented over iterators of references, for `String`, `Vec`,
10096 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
10097 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
10098 * The [`iter::once`] function returns an iterator that yields a single
10099 element, and [`iter::empty`] returns an iterator that yields no
10101 * The [`matches`] and [`rmatches`] methods on `str` return iterators
10102 over substring matches.
10103 * [`Cell`] and [`RefCell`] both implement `Eq`.
10104 * A number of methods for wrapping arithmetic are added to the
10105 integral types, [`wrapping_div`], [`wrapping_rem`],
10106 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10107 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10108 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10109 type.. It is illegal for the default arithmetic operations in Rust
10110 to overflow; the desire to wrap must be explicit.
10111 * The `{:#?}` formatting specifier [displays the alternate,
10112 pretty-printed][debugfmt] form of the `Debug` formatter. This
10113 feature was actually introduced prior to 1.0 with little
10115 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10116 for writing data to formatted strings, similar to [`io::Write`].
10117 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10118 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10119 are used by code generators to emit implementations of [`Debug`].
10120 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10121 methods that convert case, following Unicode case mapping.
10122 * It is now easier to handle poisoned locks. The [`PoisonError`]
10123 type, returned by failing lock operations, exposes `into_inner`,
10124 `get_ref`, and `get_mut`, which all give access to the inner lock
10125 guard, and allow the poisoned lock to continue to operate. The
10126 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10127 poisoned lock without attempting to take the lock.
10128 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10129 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10130 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10131 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10133 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10139 * `rustc` employs smarter heuristics for guessing at [typos].
10140 * `rustc` emits more efficient code for [no-op conversions between
10141 unsafe pointers][nop].
10142 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10143 resulting in faster compile times and smaller code.
10145 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10146 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10147 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10148 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10149 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10150 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10151 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10152 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10153 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10154 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10155 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10156 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10157 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10158 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10159 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10160 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10161 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10162 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10163 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10164 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10165 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10166 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10167 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10168 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10169 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10170 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10171 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10172 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10173 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10174 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10175 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10176 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10177 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10178 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10179 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10180 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10181 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10182 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10183 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10184 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10185 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10186 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10187 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10188 [align]: https://github.com/rust-lang/rust/pull/25646
10189 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10190 [typos]: https://github.com/rust-lang/rust/pull/26087
10191 [nop]: https://github.com/rust-lang/rust/pull/26336
10192 [fat]: https://github.com/rust-lang/rust/pull/26411
10193 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10194 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10195 [packed]: https://github.com/rust-lang/rust/pull/25541
10196 [ad]: https://github.com/rust-lang/rust/pull/27382
10197 [win]: https://github.com/rust-lang/rust/pull/25350
10199 Version 1.1.0 (2015-06-25)
10200 =========================
10202 * ~850 changes, numerous bugfixes
10207 * The [`std::fs` module has been expanded][fs] to expand the set of
10208 functionality exposed:
10209 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10210 don't incur a syscall on some platforms.
10211 * A `symlink_metadata` function has been added.
10212 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10213 access to all underlying information.
10214 * The compiler now contains extended explanations of many errors. When an error
10215 with an explanation occurs the compiler suggests using the `--explain` flag
10216 to read the explanation. Error explanations are also [available online][err-index].
10217 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10218 well as other work, the time to bootstrap the compiler decreased by
10224 * The [`str::split_whitespace`] method splits a string on unicode
10225 whitespace boundaries.
10226 * On both Windows and Unix, new extension traits provide conversion of
10227 I/O types to and from the underlying system handles. On Unix, these
10228 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10229 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10230 `TcpListener`, and `UpdSocket`. Further implementations for
10231 `std::process` will be stabilized later.
10232 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10233 Windows, symlinks can be created with
10234 `std::os::windows::symlink_dir` and
10235 `std::os::windows::symlink_file`.
10236 * The `mpsc::Receiver` type can now be converted into an iterator with
10237 `into_iter` on the [`IntoIterator`] trait.
10238 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10239 implementation of the [`From`] trait.
10240 * The `Debug` implementation for `RangeFull` [creates output that is
10241 more consistent with other implementations][rf].
10242 * [`Debug` is implemented for `File`][file].
10243 * The `Default` implementation for `Arc` [no longer requires `Sync +
10245 * [The `Iterator` methods `count`, `nth`, and `last` have been
10246 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10247 * Incorrect handling of paths on Windows has been improved in both the
10248 compiler and the standard library.
10249 * [`AtomicPtr` gained a `Default` implementation][ap].
10250 * In accordance with Rust's policy on arithmetic overflow `abs` now
10251 [panics on overflow when debug assertions are enabled][abs].
10252 * The [`Cloned`] iterator, which was accidentally left unstable for
10253 1.0 [has been stabilized][c].
10254 * The [`Incoming`] iterator, which iterates over incoming TCP
10255 connections, and which was accidentally unnamable in 1.0, [is now
10256 properly exported][inc].
10257 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10258 `sift_up` or `sift_down` panic][bh].
10259 * The [`split_off`] method of `LinkedList` [no longer corrupts
10260 the list in certain scenarios][ll].
10265 * Type checking performance [has improved notably][sk] with
10266 [multiple improvements][pre].
10267 * The compiler [suggests code changes][ch] for more errors.
10268 * rustc and it's build system have experimental support for [building
10269 toolchains against MUSL][m] instead of glibc on Linux.
10270 * The compiler defines the `target_env` cfg value, which is used for
10271 distinguishing toolchains that are otherwise for the same
10272 platform. Presently this is set to `gnu` for common GNU Linux
10273 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10274 * The [`cargo rustc`][crc] command invokes a build with custom flags
10276 * [Android executables are always position independent][pie].
10277 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10278 with `Drop`][24935].
10280 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10281 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10282 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10283 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10284 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10285 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10286 [rf]: https://github.com/rust-lang/rust/pull/24491
10287 [err-index]: https://doc.rust-lang.org/error-index.html
10288 [sk]: https://github.com/rust-lang/rust/pull/24615
10289 [pre]: https://github.com/rust-lang/rust/pull/25323
10290 [file]: https://github.com/rust-lang/rust/pull/24598
10291 [ch]: https://github.com/rust-lang/rust/pull/24683
10292 [arc]: https://github.com/rust-lang/rust/pull/24695
10293 [si]: https://github.com/rust-lang/rust/pull/24701
10294 [ap]: https://github.com/rust-lang/rust/pull/24834
10295 [m]: https://github.com/rust-lang/rust/pull/24777
10296 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10297 [crc]: https://github.com/rust-lang/cargo/pull/1568
10298 [pie]: https://github.com/rust-lang/rust/pull/24953
10299 [abs]: https://github.com/rust-lang/rust/pull/25441
10300 [c]: https://github.com/rust-lang/rust/pull/25496
10301 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10302 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10303 [inc]: https://github.com/rust-lang/rust/pull/25522
10304 [bh]: https://github.com/rust-lang/rust/pull/25856
10305 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10306 [ll]: https://github.com/rust-lang/rust/pull/26022
10307 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10308 [24935]: https://github.com/rust-lang/rust/pull/24935
10310 Version 1.0.0 (2015-05-15)
10311 ========================
10313 * ~1500 changes, numerous bugfixes
10318 * The vast majority of the standard library is now `#[stable]`. It is
10319 no longer possible to use unstable features with a stable build of
10321 * Many popular crates on [crates.io] now work on the stable release
10323 * Arithmetic on basic integer types now [checks for overflow in debug
10329 * Several [restrictions have been added to trait coherence][coh] in
10330 order to make it easier for upstream authors to change traits
10331 without breaking downstream code.
10332 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10333 improve error messages and macro behavior. For example, `0b1234` is
10334 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10335 * Trait bounds [are always invariant][inv], eliminating the need for
10336 the `PhantomFn` and `MarkerTrait` lang items, which have been
10338 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10339 "foo" as bar` syntax has been replaced with `extern crate foo as
10340 bar`, and Cargo now automatically translates "-" in *package* names
10341 to underscore for the crate name.
10342 * [Lifetime shadowing is an error][lt].
10343 * [`Send` no longer implies `'static`][send-rfc].
10344 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10345 `MyType::default()`.
10346 * Primitive types [now have inherent methods][prim-inherent],
10347 obviating the need for extension traits like `SliceExt`.
10348 * Methods with `Self: Sized` in their `where` clause are [considered
10349 object-safe][self-sized], allowing many extension traits like
10350 `IteratorExt` to be merged into the traits they extended.
10351 * You can now [refer to associated types][assoc-where] whose
10352 corresponding trait bounds appear only in a `where` clause.
10353 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10354 like `Send` and `Sync` are now library-defined.
10355 * A [Reflect trait][reflect] was introduced, which means that
10356 downcasting via the `Any` trait is effectively limited to concrete
10357 types. This helps retain the potentially-important "parametricity"
10358 property: generic code cannot behave differently for different type
10359 arguments except in minor ways.
10360 * The `unsafe_destructor` feature is now deprecated in favor of the
10361 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10367 * The `thread_local` module [has been renamed to `std::thread`][th].
10368 * The methods of `IteratorExt` [have been moved to the `Iterator`
10369 trait itself][23300].
10370 * Several traits that implement Rust's conventions for type
10371 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10372 [centralized in the `std::convert` module][con].
10373 * The `FromError` trait [was removed in favor of `From`][fe].
10374 * The basic sleep function [has moved to
10375 `std::thread::sleep_ms`][slp].
10376 * The `splitn` function now takes an `n` parameter that represents the
10377 number of items yielded by the returned iterator [instead of the
10378 number of 'splits'][spl].
10379 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10380 * [Derived implementations of `PartialOrd` now order enums according
10381 to their explicitly-assigned discriminants][po].
10382 * [Methods for searching strings are generic over `Pattern`s][pat],
10383 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10385 * [In method resolution, object methods are resolved before inherent
10387 * [`String::from_str` has been deprecated in favor of the `From` impl,
10388 `String::from`][24517].
10389 * [`io::Error` implements `Sync`][ios].
10390 * [The `words` method on `&str` has been replaced with
10391 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10393 * The new path and IO modules are complete and `#[stable]`. This
10394 was the major library focus for this cycle.
10395 * The path API was [revised][path-normalize] to normalize `.`,
10396 adjusting the tradeoffs in favor of the most common usage.
10397 * A large number of remaining APIs in `std` were also stabilized
10398 during this cycle; about 75% of the non-deprecated API surface
10400 * The new [string pattern API][string-pattern] landed, which makes
10401 the string slice API much more internally consistent and flexible.
10402 * A new set of [generic conversion traits][conversion] replaced
10403 many existing ad hoc traits.
10404 * Generic numeric traits were [completely removed][num-traits]. This
10405 was made possible thanks to inherent methods for primitive types,
10406 and the removal gives maximal flexibility for designing a numeric
10407 hierarchy in the future.
10408 * The `Fn` traits are now related via [inheritance][fn-inherit]
10409 and provide ergonomic [blanket implementations][fn-blanket].
10410 * The `Index` and `IndexMut` traits were changed to
10411 [take the index by value][index-value], enabling code like
10412 `hash_map["string"]` to work.
10413 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10414 `Copy` data is known to be `Clone` as well.
10419 * Many errors now have extended explanations that can be accessed with
10420 the `--explain` flag to `rustc`.
10421 * Many new examples have been added to the standard library
10423 * rustdoc has received a number of improvements focused on completion
10425 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10426 * Much headway was made on ecosystem-wide CI, making it possible
10427 to [compare builds for breakage][ci-compare].
10430 [crates.io]: http://crates.io
10431 [clo]: https://github.com/rust-lang/rust/pull/24034
10432 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10433 [con]: https://github.com/rust-lang/rust/pull/23875
10434 [cr]: https://github.com/rust-lang/rust/pull/23419
10435 [fe]: https://github.com/rust-lang/rust/pull/23879
10436 [23300]: https://github.com/rust-lang/rust/pull/23300
10437 [inv]: https://github.com/rust-lang/rust/pull/23938
10438 [ios]: https://github.com/rust-lang/rust/pull/24133
10439 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10440 [lt]: https://github.com/rust-lang/rust/pull/24057
10441 [meth]: https://github.com/rust-lang/rust/pull/24056
10442 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10443 [po]: https://github.com/rust-lang/rust/pull/24270
10444 [24517]: https://github.com/rust-lang/rust/pull/24517
10445 [slp]: https://github.com/rust-lang/rust/pull/23949
10446 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10447 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10448 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10449 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10450 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10451 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10452 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10453 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10454 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10455 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10456 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10457 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10458 [reflect]: https://github.com/rust-lang/rust/pull/23712
10459 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10460 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10461 [index-value]: https://github.com/rust-lang/rust/pull/23601
10462 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10463 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10464 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10465 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10466 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10467 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10470 Version 1.0.0-alpha.2 (2015-02-20)
10471 =====================================
10473 * ~1300 changes, numerous bugfixes
10477 * The various I/O modules were [overhauled][io-rfc] to reduce
10478 unnecessary abstractions and provide better interoperation with
10479 the underlying platform. The old `io` module remains temporarily
10481 * The standard library now [participates in feature gating][feat],
10482 so use of unstable libraries now requires a `#![feature(...)]`
10483 attribute. The impact of this change is [described on the
10484 forum][feat-forum]. [RFC][feat-rfc].
10488 * `for` loops [now operate on the `IntoIterator` trait][into],
10489 which eliminates the need to call `.iter()`, etc. to iterate
10490 over collections. There are some new subtleties to remember
10491 though regarding what sort of iterators various types yield, in
10492 particular that `for foo in bar { }` yields values from a move
10493 iterator, destroying the original collection. [RFC][into-rfc].
10494 * Objects now have [default lifetime bounds][obj], so you don't
10495 have to write `Box<Trait+'static>` when you don't care about
10496 storing references. [RFC][obj-rfc].
10497 * In types that implement `Drop`, [lifetimes must outlive the
10498 value][drop]. This will soon make it possible to safely
10499 implement `Drop` for types where `#[unsafe_destructor]` is now
10500 required. Read the [gorgeous RFC][drop-rfc] for details.
10501 * The fully qualified <T as Trait>::X syntax lets you set the Self
10502 type for a trait method or associated type. [RFC][ufcs-rfc].
10503 * References to types that implement `Deref<U>` now [automatically
10504 coerce to references][deref] to the dereferenced type `U`,
10505 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10506 should eliminate many unsightly uses of `&*`, as when converting
10507 from references to vectors into references to
10508 slices. [RFC][deref-rfc].
10509 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10510 `|:|`) is obsolete and closure kind is inferred from context.
10511 * [`Self` is a keyword][Self].
10515 * The `Show` and `String` formatting traits [have been
10516 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10517 their related purposes. Automatically getting a string
10518 conversion to use with `format!("{:?}", something_to_debug)` is
10519 now written `#[derive(Debug)]`.
10520 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10521 OsStr}`, provide strings in platform-specific encodings for easier
10522 interop with system APIs. [RFC][osstr-rfc].
10523 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10524 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10525 creating raw pointers.
10529 * Certain long error messages of the form 'expected foo found bar'
10530 are now [split neatly across multiple
10531 lines][multiline]. Examples in the PR.
10532 * On Unix Rust can be [uninstalled][un] by running
10533 `/usr/local/lib/rustlib/uninstall.sh`.
10534 * The `#[rustc_on_unimplemented]` attribute, requiring the
10535 'on_unimplemented' feature, lets rustc [display custom error
10536 messages when a trait is expected to be implemented for a type
10541 * Rust is tested against a [LALR grammar][lalr], which parses
10542 almost all the Rust files that rustc does.
10544 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10545 [close]: https://github.com/rust-lang/rust/pull/21843
10546 [deref]: https://github.com/rust-lang/rust/pull/21351
10547 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10548 [drop]: https://github.com/rust-lang/rust/pull/21972
10549 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10550 [feat]: https://github.com/rust-lang/rust/pull/21248
10551 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10552 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10553 [fmt]: https://github.com/rust-lang/rust/pull/21457
10554 [into]: https://github.com/rust-lang/rust/pull/20790
10555 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10556 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10557 [lalr]: https://github.com/rust-lang/rust/pull/21452
10558 [multiline]: https://github.com/rust-lang/rust/pull/19870
10559 [obj]: https://github.com/rust-lang/rust/pull/22230
10560 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10561 [onun]: https://github.com/rust-lang/rust/pull/20889
10562 [osstr]: https://github.com/rust-lang/rust/pull/21488
10563 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10564 [Self]: https://github.com/rust-lang/rust/pull/22158
10565 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10566 [un]: https://github.com/rust-lang/rust/pull/22256
10569 Version 1.0.0-alpha (2015-01-09)
10570 ==================================
10572 * ~2400 changes, numerous bugfixes
10576 * The language itself is considered feature complete for 1.0,
10577 though there will be many usability improvements and bugfixes
10578 before the final release.
10579 * Nearly 50% of the public API surface of the standard library has
10580 been declared 'stable'. Those interfaces are unlikely to change
10582 * The long-running debate over integer types has been
10583 [settled][ints]: Rust will ship with types named `isize` and
10584 `usize`, rather than `int` and `uint`, for pointer-sized
10585 integers. Guidelines will be rolled out during the alpha cycle.
10586 * Most crates that are not `std` have been moved out of the Rust
10587 distribution into the Cargo ecosystem so they can evolve
10588 separately and don't need to be stabilized as quickly, including
10589 'time', 'getopts', 'num', 'regex', and 'term'.
10590 * Documentation continues to be expanded with more API coverage, more
10591 examples, and more in-depth explanations. The guides have been
10592 consolidated into [The Rust Programming Language][trpl].
10593 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10594 * All official Rust binary installers now come with [Cargo], the
10595 Rust package manager.
10599 * Closures have been [completely redesigned][unboxed] to be
10600 implemented in terms of traits, can now be used as generic type
10601 bounds and thus monomorphized and inlined, or via an opaque
10602 pointer (boxed) as in the old system. The new system is often
10603 referred to as 'unboxed' closures.
10604 * Traits now support [associated types][assoc], allowing families
10605 of related types to be defined together and used generically in
10607 * Enum variants are [namespaced by their type names][enum].
10608 * [`where` clauses][where] provide a more versatile and attractive
10609 syntax for specifying generic bounds, though the previous syntax
10611 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10613 * Rust [no longer has a runtime][rt] of any description, and only
10614 supports OS threads, not green threads.
10615 * At long last, Rust has been overhauled for 'dynamically-sized
10616 types' ([DST]), which integrates 'fat pointers' (object types,
10617 arrays, and `str`) more deeply into the type system, making it
10619 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10620 `..j` that produce range types and which, when combined with the
10621 `Index` operator and multidispatch, leads to a convenient slice
10622 notation, `[i..j]`.
10623 * The new range syntax revealed an ambiguity in the fixed-length
10624 array syntax, so now fixed length arrays [are written `[T;
10626 * The `Copy` trait is no longer implemented automatically. Unsafe
10627 pointers no longer implement `Sync` and `Send` so types
10628 containing them don't automatically either. `Sync` and `Send`
10629 are now 'unsafe traits' so one can "forcibly" implement them via
10630 `unsafe impl` if a type confirms to the requirements for them
10631 even though the internals do not (e.g. structs containing unsafe
10632 pointers like `Arc`). These changes are intended to prevent some
10633 footguns and are collectively known as [opt-in built-in
10634 traits][oibit] (though `Sync` and `Send` will soon become pure
10635 library types unknown to the compiler).
10636 * Operator traits now take their operands [by value][ops], and
10637 comparison traits can use multidispatch to compare one type
10638 against multiple other types, allowing e.g. `String` to be
10639 compared with `&str`.
10640 * `if let` and `while let` are no longer feature-gated.
10641 * Rust has adopted a more [uniform syntax for escaping unicode
10642 characters][unicode].
10643 * `macro_rules!` [has been declared stable][mac]. Though it is a
10644 flawed system it is sufficiently popular that it must be usable
10645 for 1.0. Effort has gone into [future-proofing][mac-future] it
10646 in ways that will allow other macro systems to be developed in
10647 parallel, and won't otherwise impact the evolution of the
10649 * The prelude has been [pared back significantly][prelude] such
10650 that it is the minimum necessary to support the most pervasive
10651 code patterns, and through [generalized where clauses][where]
10652 many of the prelude extension traits have been consolidated.
10653 * Rust's rudimentary reflection [has been removed][refl], as it
10654 incurred too much code generation for little benefit.
10655 * [Struct variants][structvars] are no longer feature-gated.
10656 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10657 known as 'higher-ranked trait bounds', this crucially allows
10658 unboxed closures to work.
10659 * Macros invocations surrounded by parens or square brackets and
10660 not terminated by a semicolon are [parsed as
10661 expressions][macros], which makes expressions like `vec![1i32,
10662 2, 3].len()` work as expected.
10663 * Trait objects now implement their traits automatically, and
10664 traits that can be coerced to objects now must be [object
10666 * Automatically deriving traits is now done with `#[derive(...)]`
10667 not `#[deriving(...)]` for [consistency with other naming
10668 conventions][derive].
10669 * Importing the containing module or enum at the same time as
10670 items or variants they contain is [now done with `self` instead
10671 of `mod`][self], as in use `foo::{self, bar}`
10672 * Glob imports are no longer feature-gated.
10673 * The `box` operator and `box` patterns have been feature-gated
10674 pending a redesign. For now unique boxes should be allocated
10675 like other containers, with `Box::new`.
10679 * A [series][coll1] of [efforts][coll2] to establish
10680 [conventions][coll3] for collections types has resulted in API
10681 improvements throughout the standard library.
10682 * New [APIs for error handling][err] provide ergonomic interop
10683 between error types, and [new conventions][err-conv] describe
10684 more clearly the recommended error handling strategies in Rust.
10685 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10686 it is easier to discuss failure in the context of error handling
10687 without making clarifications as to whether you are referring to
10688 the 'fail' macro or failure more generally.
10689 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10690 syscall when available.
10691 * The 'serialize' crate has been renamed 'rustc-serialize' and
10692 moved out of the distribution to Cargo. Although it is widely
10693 used now, it is expected to be superseded in the near future.
10694 * The `Show` formatter, typically implemented with
10695 `#[derive(Show)]` is [now requested with the `{:?}`
10696 specifier][show] and is intended for use by all types, for uses
10697 such as `println!` debugging. The new `String` formatter must be
10698 implemented by hand, uses the `{}` specifier, and is intended
10699 for full-fidelity conversions of things that can logically be
10700 represented as strings.
10704 * [Flexible target specification][flex] allows rustc's code
10705 generation to be configured to support otherwise-unsupported
10707 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10708 respective debuggers with Rust-appropriate pretty-printing.
10709 * The Windows installation of Rust is distributed with the
10710 MinGW components currently required to link binaries on that
10715 * Nullable enum optimizations have been extended to more types so
10716 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10717 space than the inner types themselves.
10718 * Work has begun on supporting AArch64.
10720 [Cargo]: https://crates.io
10721 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10722 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10723 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10724 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10725 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10726 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10727 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10728 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10729 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10730 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10731 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10732 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10733 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10734 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10735 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10736 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10737 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10738 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10739 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10740 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10741 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10742 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10743 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10744 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10745 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10746 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10747 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10748 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10749 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10750 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10751 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10752 [trpl]: https://doc.rust-lang.org/book/index.html
10753 [rbe]: http://rustbyexample.com/
10756 Version 0.12.0 (2014-10-09)
10757 =============================
10759 * ~1900 changes, numerous bugfixes
10763 * The introductory documentation (now called The Rust Guide) has
10764 been completely rewritten, as have a number of supplementary
10766 * Rust's package manager, Cargo, continues to improve and is
10767 sometimes considered to be quite awesome.
10768 * Many API's in `std` have been reviewed and updated for
10769 consistency with the in-development Rust coding
10770 guidelines. The standard library documentation tracks
10771 stabilization progress.
10772 * Minor libraries have been moved out-of-tree to the rust-lang org
10773 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10774 be installed with Cargo.
10775 * Lifetime elision allows lifetime annotations to be left off of
10776 function declarations in many common scenarios.
10777 * Rust now works on 64-bit Windows.
10780 * Indexing can be overloaded with the `Index` and `IndexMut`
10782 * The `if let` construct takes a branch only if the `let` pattern
10783 matches, currently behind the 'if_let' feature gate.
10784 * 'where clauses', a more flexible syntax for specifying trait
10785 bounds that is more aesthetic, have been added for traits and
10786 free functions. Where clauses will in the future make it
10787 possible to constrain associated types, which would be
10788 impossible with the existing syntax.
10789 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10790 the 'slicing_syntax' feature gate, and can be overloaded with
10791 the `Slice` or `SliceMut` traits.
10792 * The syntax for matching of sub-slices has been changed to use a
10793 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10794 consistency with other uses of `..` and to future-proof
10795 potential additional uses of the syntax.
10796 * The syntax for matching inclusive ranges in patterns has changed
10797 from `0..3` to `0...4` to be consistent with the exclusive range
10798 syntax for slicing.
10799 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10800 c]`) has been put behind the 'advanced_slice_patterns' feature
10801 gate and may be removed in the future.
10802 * Components of tuples and tuple structs can be extracted using
10803 the `value.0` syntax, currently behind the `tuple_indexing`
10805 * The `#[crate_id]` attribute is no longer supported; versioning
10806 is handled by the package manager.
10807 * Renaming crate imports are now written `extern crate foo as bar`
10808 instead of `extern crate bar = foo`.
10809 * Renaming use statements are now written `use foo as bar` instead
10810 of `use bar = foo`.
10811 * `let` and `match` bindings and argument names in macros are now
10813 * The new, more efficient, closure types ('unboxed closures') have
10814 been added under a feature gate, 'unboxed_closures'. These will
10815 soon replace the existing closure types, once higher-ranked
10816 trait lifetimes are added to the language.
10817 * `move` has been added as a keyword, for indicating closures
10818 that capture by value.
10819 * Mutation and assignment is no longer allowed in pattern guards.
10820 * Generic structs and enums can now have trait bounds.
10821 * The `Share` trait is now called `Sync` to free up the term
10822 'shared' to refer to 'shared reference' (the default reference
10824 * Dynamically-sized types have been mostly implemented,
10825 unifying the behavior of fat-pointer types with the rest of the
10827 * As part of dynamically-sized types, the `Sized` trait has been
10828 introduced, which qualifying types implement by default, and
10829 which type parameters expect by default. To specify that a type
10830 parameter does not need to be sized, write `<Sized? T>`. Most
10831 types are `Sized`, notable exceptions being unsized arrays
10832 (`[T]`) and trait types.
10833 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10834 * Lifetime bounds can now be applied to type parameters and object
10836 * The old, reference counted GC type, `Gc<T>` which was once
10837 denoted by the `@` sigil, has finally been removed. GC will be
10838 revisited in the future.
10841 * Library documentation has been improved for a number of modules.
10842 * Bit-vectors, collections::bitv has been modernized.
10843 * The url crate is deprecated in favor of
10844 http://github.com/servo/rust-url, which can be installed with
10846 * Most I/O stream types can be cloned and subsequently closed from
10847 a different thread.
10848 * A `std::time::Duration` type has been added for use in I/O
10849 methods that rely on timers, as well as in the 'time' crate's
10850 `Timespec` arithmetic.
10851 * The runtime I/O abstraction layer that enabled the green thread
10852 scheduler to do non-thread-blocking I/O has been removed, along
10853 with the libuv-based implementation employed by the green thread
10854 scheduler. This will greatly simplify the future I/O work.
10855 * `collections::btree` has been rewritten to have a more
10856 idiomatic and efficient design.
10859 * rustdoc output now indicates the stability levels of API's.
10860 * The `--crate-name` flag can specify the name of the crate
10861 being compiled, like `#[crate_name]`.
10862 * The `-C metadata` specifies additional metadata to hash into
10863 symbol names, and `-C extra-filename` specifies additional
10864 information to put into the output filename, for use by the
10865 package manager for versioning.
10866 * debug info generation has continued to improve and should be
10867 more reliable under both gdb and lldb.
10868 * rustc has experimental support for compiling in parallel
10869 using the `-C codegen-units` flag.
10870 * rustc no longer encodes rpath information into binaries by
10874 * Stack usage has been optimized with LLVM lifetime annotations.
10875 * Official Rust binaries on Linux are more compatible with older
10876 kernels and distributions, built on CentOS 5.10.
10879 Version 0.11.0 (2014-07-02)
10880 ==========================
10882 * ~1700 changes, numerous bugfixes
10885 * ~[T] has been removed from the language. This type is superseded by
10887 * ~str has been removed from the language. This type is superseded by
10889 * ~T has been removed from the language. This type is superseded by the
10891 * @T has been removed from the language. This type is superseded by the
10892 standard library's std::gc::Gc<T> type.
10893 * Struct fields are now all private by default.
10894 * Vector indices and shift amounts are both required to be a `uint`
10895 instead of any integral type.
10896 * Byte character, byte string, and raw byte string literals are now all
10897 supported by prefixing the normal literal with a `b`.
10898 * Multiple ABIs are no longer allowed in an ABI string
10899 * The syntax for lifetimes on closures/procedures has been tweaked
10900 slightly: `<'a>|A, B|: 'b + K -> T`
10901 * Floating point modulus has been removed from the language; however it
10902 is still provided by a library implementation.
10903 * Private enum variants are now disallowed.
10904 * The `priv` keyword has been removed from the language.
10905 * A closure can no longer be invoked through a &-pointer.
10906 * The `use foo, bar, baz;` syntax has been removed from the language.
10907 * The transmute intrinsic no longer works on type parameters.
10908 * Statics now allow blocks/items in their definition.
10909 * Trait bounds are separated from objects with + instead of : now.
10910 * Objects can no longer be read while they are mutably borrowed.
10911 * The address of a static is now marked as insignificant unless the
10912 #[inline(never)] attribute is placed it.
10913 * The #[unsafe_destructor] attribute is now behind a feature gate.
10914 * Struct literals are no longer allowed in ambiguous positions such as
10915 if, while, match, and for..in.
10916 * Declaration of lang items and intrinsics are now feature-gated by
10918 * Integral literals no longer default to `int`, and floating point
10919 literals no longer default to `f64`. Literals must be suffixed with an
10920 appropriate type if inference cannot determine the type of the
10922 * The Box<T> type is no longer implicitly borrowed to &mut T.
10923 * Procedures are now required to not capture borrowed references.
10926 * The standard library is now a "facade" over a number of underlying
10927 libraries. This means that development on the standard library should
10928 be speedier due to smaller crates, as well as a clearer line between
10930 * A new library, libcore, lives under the standard library's facade
10931 which is Rust's "0-assumption" library, suitable for embedded and
10932 kernel development for example.
10933 * A regex crate has been added to the standard distribution. This crate
10934 includes statically compiled regular expressions.
10935 * The unwrap/unwrap_err methods on Result require a Show bound for
10936 better error messages.
10937 * The return types of the std::comm primitives have been centralized
10938 around the Result type.
10939 * A number of I/O primitives have gained the ability to time out their
10941 * A number of I/O primitives have gained the ability to close their
10942 reading/writing halves to cancel pending operations.
10943 * Reverse iterator methods have been removed in favor of `rev()` on
10944 their forward-iteration counterparts.
10945 * A bitflags! macro has been added to enable easy interop with C and
10946 management of bit flags.
10947 * A debug_assert! macro is now provided which is disabled when
10948 `--cfg ndebug` is passed to the compiler.
10949 * A graphviz crate has been added for creating .dot files.
10950 * The std::cast module has been migrated into std::mem.
10951 * The std::local_data api has been migrated from freestanding functions
10952 to being based on methods.
10953 * The Pod trait has been renamed to Copy.
10954 * jemalloc has been added as the default allocator for types.
10955 * The API for allocating memory has been changed to use proper alignment
10956 and sized deallocation
10957 * Connecting a TcpStream or binding a TcpListener is now based on a
10958 string address and a u16 port. This allows connecting to a hostname as
10960 * The Reader trait now contains a core method, read_at_least(), which
10961 correctly handles many repeated 0-length reads.
10962 * The process-spawning API is now centered around a builder-style
10964 * The :? printing qualifier has been moved from the standard library to
10965 an external libdebug crate.
10966 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10967 have been renamed to Eq/Ord.
10968 * The select/plural methods have been removed from format!. The escapes
10969 for { and } have also changed from \{ and \} to {{ and }},
10971 * The TaskBuilder API has been re-worked to be a true builder, and
10972 extension traits for spawning native/green tasks have been added.
10975 * All breaking changes to the language or libraries now have their
10976 commit message annotated with `[breaking-change]` to allow for easy
10977 discovery of breaking changes.
10978 * The compiler will now try to suggest how to annotate lifetimes if a
10979 lifetime-related error occurs.
10980 * Debug info continues to be improved greatly with general bug fixes and
10981 better support for situations like link time optimization (LTO).
10982 * Usage of syntax extensions when cross-compiling has been fixed.
10983 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10984 -fdata-sections and --gc-sections has been enabled by default
10985 * The compiler is now stricter about where it will load module files
10986 from when a module is declared via `mod foo;`.
10987 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10988 Syntax extensions are now discovered via a "plugin registrar" type
10989 which will be extended in the future to other various plugins.
10990 * Lints have been restructured to allow for dynamically loadable lints.
10991 * A number of rustdoc improvements:
10992 * The HTML output has been visually redesigned.
10993 * Markdown is now powered by hoedown instead of sundown.
10994 * Searching heuristics have been greatly improved.
10995 * The search index has been reduced in size by a great amount.
10996 * Cross-crate documentation via `pub use` has been greatly improved.
10997 * Primitive types are now hyperlinked and documented.
10998 * Documentation has been moved from static.rust-lang.org/doc to
11000 * A new sandbox, play.rust-lang.org, is available for running and
11001 sharing rust code examples on-line.
11002 * Unused attributes are now more robustly warned about.
11003 * The dead_code lint now warns about unused struct fields.
11004 * Cross-compiling to iOS is now supported.
11005 * Cross-compiling to mipsel is now supported.
11006 * Stability attributes are now inherited by default and no longer apply
11007 to intra-crate usage, only inter-crate usage.
11008 * Error message related to non-exhaustive match expressions have been
11012 Version 0.10 (2014-04-03)
11013 =========================
11015 * ~1500 changes, numerous bugfixes
11018 * A new RFC process is now in place for modifying the language.
11019 * Patterns with `@`-pointers have been removed from the language.
11020 * Patterns with unique vectors (`~[T]`) have been removed from the
11022 * Patterns with unique strings (`~str`) have been removed from the
11024 * `@str` has been removed from the language.
11025 * `@[T]` has been removed from the language.
11026 * `@self` has been removed from the language.
11027 * `@Trait` has been removed from the language.
11028 * Headers on `~` allocations which contain `@` boxes inside the type for
11029 reference counting have been removed.
11030 * The semantics around the lifetimes of temporary expressions have changed,
11031 see #3511 and #11585 for more information.
11032 * Cross-crate syntax extensions are now possible, but feature gated. See
11033 #11151 for more information. This includes both `macro_rules!` macros as
11034 well as syntax extensions such as `format!`.
11035 * New lint modes have been added, and older ones have been turned on to be
11037 * Unnecessary parentheses
11038 * Uppercase statics
11040 * Uppercase variables
11041 * Publicly visible private types
11042 * `#[deriving]` with raw pointers
11043 * Unsafe functions can no longer be coerced to closures.
11044 * Various obscure macros such as `log_syntax!` are now behind feature gates.
11045 * The `#[simd]` attribute is now behind a feature gate.
11046 * Visibility is no longer allowed on `extern crate` statements, and
11047 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
11048 * Trailing commas are now allowed in argument lists and tuple patterns.
11049 * The `do` keyword has been removed, it is now a reserved keyword.
11050 * Default type parameters have been implemented, but are feature gated.
11051 * Borrowed variables through captures in closures are now considered soundly.
11052 * `extern mod` is now `extern crate`
11053 * The `Freeze` trait has been removed.
11054 * The `Share` trait has been added for types that can be shared among
11056 * Labels in macros are now hygienic.
11057 * Expression/statement macro invocations can be delimited with `{}` now.
11058 * Treatment of types allowed in `static mut` locations has been tweaked.
11059 * The `*` and `.` operators are now overloadable through the `Deref` and
11061 * `~Trait` and `proc` no longer have `Send` bounds by default.
11062 * Partial type hints are now supported with the `_` type marker.
11063 * An `Unsafe` type was introduced for interior mutability. It is now
11064 considered undefined to transmute from `&T` to `&mut T` without using the
11066 * The #[linkage] attribute was implemented for extern statics/functions.
11067 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
11068 * `Pod` was renamed to `Copy`.
11071 * The `libextra` library has been removed. It has now been decomposed into
11072 component libraries with smaller and more focused nuggets of
11073 functionality. The full list of libraries can be found on the
11074 documentation index page.
11075 * std: `std::condition` has been removed. All I/O errors are now propagated
11076 through the `Result` type. In order to assist with error handling, a
11077 `try!` macro for unwrapping errors with an early return and a lint for
11078 unused results has been added. See #12039 for more information.
11079 * std: The `vec` module has been renamed to `slice`.
11080 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
11081 This will become the only growable vector in the future.
11082 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
11083 are now found at `std::io::BufferedReader` instead of
11084 `std::io::buffered::BufferedReader`.
11085 * std: `print` and `println` are no longer in the prelude, the `print!` and
11086 `println!` macros are intended to be used instead.
11087 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
11088 attempts to statically prevent cycles.
11089 * std: The standard distribution is adopting the policy of pushing failure
11090 to the user rather than failing in libraries. Many functions (such as
11091 `slice::last()`) now return `Option<T>` instead of `T` + failing.
11092 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
11093 deriving mode: `#[deriving(Show)]`.
11094 * std: `ToStr` is now implemented for all types implementing `Show`.
11095 * std: The formatting trait methods now take `&self` instead of `&T`
11096 * std: The `invert()` method on iterators has been renamed to `rev()`
11097 * std: `std::num` has seen a reduction in the genericity of its traits,
11098 consolidating functionality into a few core traits.
11099 * std: Backtraces are now printed on task failure if the environment
11100 variable `RUST_BACKTRACE` is present.
11101 * std: Naming conventions for iterators have been standardized. More details
11102 can be found on the wiki's style guide.
11103 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11104 still implement the function.
11105 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11106 * std: `assert_approx_eq!` has been removed
11107 * std: The `e` and `E` formatting specifiers for floats have been added to
11108 print them in exponential notation.
11109 * std: The `Times` trait has been removed
11110 * std: Indications of variance and opting out of builtin bounds is done
11111 through marker types in `std::kinds::marker` now
11112 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11113 `#[deriving(Hash)]` is now possible.
11114 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11115 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11116 * std: `Chan::new` is now `channel()`.
11117 * std: A new synchronous channel type has been implemented.
11118 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11119 * std: `hashmap` and `trie` have been moved to `libcollections`
11120 * std: `run` has been rolled into `io::process`
11121 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11122 * std: The equality and comparison traits have seen some reorganization.
11123 * std: `rand` has moved to `librand`.
11124 * std: `to_{lower,upper}case` has been implemented for `char`.
11125 * std: Logging has been moved to `liblog`.
11126 * collections: `HashMap` has been rewritten for higher performance and less
11128 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11129 it can be booted manually. The runtime guide has more information and
11131 * native: All I/O functionality except signals has been implemented.
11132 * green: Task spawning with `libgreen` has been optimized with stack caching
11133 and various trimming of code.
11134 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11135 * sync: The `extra::sync` module has been updated to modern rust (and moved
11136 to the `sync` library), tweaking and improving various interfaces while
11137 dropping redundant functionality.
11138 * sync: A new `Barrier` type has been added to the `sync` library.
11139 * sync: An efficient mutex for native and green tasks has been implemented.
11140 * serialize: The `base64` module has seen some improvement. It treats
11141 newlines better, has non-string error values, and has seen general
11143 * fourcc: A `fourcc!` macro was introduced
11144 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11145 hexadecimal literal.
11148 * `rustpkg` has been deprecated and removed from the main repository. Its
11149 replacement, `cargo`, is under development.
11150 * Nightly builds of rust are now available
11151 * The memory usage of rustc has been improved many times throughout this
11153 * The build process supports disabling rpath support for the rustc binary
11155 * Code generation has improved in some cases, giving more information to the
11156 LLVM optimization passes to enable more extensive optimizations.
11157 * Debuginfo compatibility with lldb on OSX has been restored.
11158 * The master branch is now gated on an android bot, making building for
11159 android much more reliable.
11160 * Output flags have been centralized into one `--emit` flag.
11161 * Crate type flags have been centralized into one `--crate-type` flag.
11162 * Codegen flags have been consolidated behind a `-C` flag.
11163 * Linking against outdated crates now has improved error messages.
11164 * Error messages with lifetimes will often suggest how to annotate the
11165 function to fix the error.
11166 * Many more types are documented in the standard library, and new guides
11168 * Many `rustdoc` improvements:
11169 * code blocks are syntax highlighted.
11170 * render standalone markdown files.
11171 * the --test flag tests all code blocks by default.
11172 * exported macros are displayed.
11173 * re-exported types have their documentation inlined at the location of the
11175 * search works across crates that have been rendered to the same output
11179 Version 0.9 (2014-01-09)
11180 ==========================
11182 * ~1800 changes, numerous bugfixes
11185 * The `float` type has been removed. Use `f32` or `f64` instead.
11186 * A new facility for enabling experimental features (feature gating) has
11187 been added, using the crate-level `#[feature(foo)]` attribute.
11188 * Managed boxes (@) are now behind a feature gate
11189 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11190 standard library's `Gc` or `Rc` types instead.
11191 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11192 * Jumping back to the top of a loop is now done with `continue` instead of
11194 * Strings can no longer be mutated through index assignment.
11195 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11196 hash delimiters, as in `r###"foo"###`.
11197 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11199 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11200 * `@fn`s have been removed.
11201 * `do` only works with procs in order to make it obvious what the cost
11203 * Single-element tuple-like structs can no longer be dereferenced to
11204 obtain the inner value. A more comprehensive solution for overloading
11205 the dereference operator will be provided in the future.
11206 * The `#[link(...)]` attribute has been replaced with
11207 `#[crate_id = "name#vers"]`.
11208 * Empty `impl`s must be terminated with empty braces and may not be
11209 terminated with a semicolon.
11210 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11211 no longer has any special meaning.
11212 * The old `fmt!` string formatting macro has been removed.
11213 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11214 `print!` and `println!`.
11215 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11216 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11217 `extern mod foo = "bar"` instead.
11218 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11219 * Macros can have attributes.
11220 * Macros can expand to items with attributes.
11221 * Macros can expand to multiple items.
11222 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11223 * Comments may be nested.
11224 * Values automatically coerce to trait objects they implement, without
11226 * Enum discriminants are no longer an entire word but as small as needed to
11227 contain all the variants. The `repr` attribute can be used to override
11228 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11229 `#[repr(C)]` to match C enums.
11230 * Non-string literals are not allowed in attributes (they never worked).
11231 * The FFI now supports variadic functions.
11232 * Octal numeric literals, as in `0o7777`.
11233 * The `concat!` syntax extension performs compile-time string concatenation.
11234 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11235 removed as Rust no longer uses segmented stacks.
11236 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11237 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11238 not `*`; ignoring remaining fields of a struct is also done with `..`,
11239 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11240 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11241 * `rustc` supports the "system" calling convention, which defaults to the
11242 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11244 * The `type_overflow` lint (default: warn) checks literals for overflow.
11245 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11246 * The `attribute_usage` lint (default: warn) warns about unknown
11248 * The `unknown_features` lint (default: warn) warns about unknown
11250 * The `dead_code` lint (default: warn) checks for dead code.
11251 * Rust libraries can be linked statically to one another
11252 * `#[link_args]` is behind the `link_args` feature gate.
11253 * Native libraries are now linked with `#[link(name = "foo")]`
11254 * Native libraries can be statically linked to a rust crate
11255 (`#[link(name = "foo", kind = "static")]`).
11256 * Native OS X frameworks are now officially supported
11257 (`#[link(name = "foo", kind = "framework")]`).
11258 * The `#[thread_local]` attribute creates thread-local (not task-local)
11259 variables. Currently behind the `thread_local` feature gate.
11260 * The `return` keyword may be used in closures.
11261 * Types that can be copied via a memcpy implement the `Pod` kind.
11262 * The `cfg` attribute can now be used on struct fields and enum variants.
11265 * std: The `option` and `result` API's have been overhauled to make them
11266 simpler, more consistent, and more composable.
11267 * std: The entire `std::io` module has been replaced with one that is
11268 more comprehensive and that properly interfaces with the underlying
11269 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11271 * std: `io::util` contains a number of useful implementations of
11272 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11273 `ZeroReader`, `TeeReader`.
11274 * std: The reference counted pointer type `extra::rc` moved into std.
11275 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11276 just a wrapper around it).
11277 * std: The `Either` type has been removed.
11278 * std: `fmt::Default` can be implemented for any type to provide default
11279 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11280 * std: The `rand` API continues to be tweaked.
11281 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11282 on failure in gdb, is now named `rust_fail`.
11283 * std: The `each_key` and `each_value` methods on `HashMap` have been
11284 replaced by the `keys` and `values` iterators.
11285 * std: Functions dealing with type size and alignment have moved from the
11286 `sys` module to the `mem` module.
11287 * std: The `path` module was written and API changed.
11288 * std: `str::from_utf8` has been changed to cast instead of allocate.
11289 * std: `starts_with` and `ends_with` methods added to vectors via the
11290 `ImmutableEqVector` trait, which is in the prelude.
11291 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11292 if the index is out of bounds.
11293 * std: Task failure no longer propagates between tasks, as the model was
11294 complex, expensive, and incompatible with thread-based tasks.
11295 * std: The `Any` type can be used for dynamic typing.
11296 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11298 * std: Methods that produce iterators generally do not have an `_iter`
11300 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11301 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11302 * std: `util::ignore` renamed to `prelude::drop`.
11303 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11305 * std: `vec::raw` has seen a lot of cleanup and API changes.
11306 * std: The standard library no longer includes any C++ code, and very
11307 minimal C, eliminating the dependency on libstdc++.
11308 * std: Runtime scheduling and I/O functionality has been factored out into
11309 extensible interfaces and is now implemented by two different crates:
11310 libnative, for native threading and I/O; and libgreen, for green threading
11311 and I/O. This paves the way for using the standard library in more limited
11312 embedded environments.
11313 * std: The `comm` module has been rewritten to be much faster, have a
11314 simpler, more consistent API, and to work for both native and green
11316 * std: All libuv dependencies have been moved into the rustuv crate.
11317 * native: New implementations of runtime scheduling on top of OS threads.
11318 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11320 * green: The green thread scheduler and message passing types are almost
11321 entirely lock-free.
11322 * extra: The `flatpipes` module had bitrotted and was removed.
11323 * extra: All crypto functions have been removed and Rust now has a policy of
11324 not reimplementing crypto in the standard library. In the future crypto
11325 will be provided by external crates with bindings to established libraries.
11326 * extra: `c_vec` has been modernized.
11327 * extra: The `sort` module has been removed. Use the `sort` method on
11331 * The `rust` and `rusti` commands have been removed, due to lack of
11333 * `rustdoc` was completely rewritten.
11334 * `rustdoc` can test code examples in documentation.
11335 * `rustpkg` can test packages with the argument, 'test'.
11336 * `rustpkg` supports arbitrary dependencies, including C libraries.
11337 * `rustc`'s support for generating debug info is improved again.
11338 * `rustc` has better error reporting for unbalanced delimiters.
11339 * `rustc`'s JIT support was removed due to bitrot.
11340 * Executables and static libraries can be built with LTO (-Z lto)
11341 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11345 Version 0.8 (2013-09-26)
11346 ============================
11348 * ~2200 changes, numerous bugfixes
11351 * The `for` loop syntax has changed to work with the `Iterator` trait.
11352 * At long last, unwinding works on Windows.
11353 * Default methods are ready for use.
11354 * Many trait inheritance bugs fixed.
11355 * Owned and borrowed trait objects work more reliably.
11356 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11357 * rustc can omit emission of code for the `debug!` macro if it is passed
11359 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11360 for foo.rs, then foo/mod.rs, and will generate an error when both are
11362 * Strings no longer contain trailing nulls. The new `std::c_str` module
11363 provides new mechanisms for converting to C strings.
11364 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11365 * The FFI has been overhauled such that foreign functions are called directly,
11366 instead of through a stack-switching wrapper.
11367 * Calling a foreign function must be done through a Rust function with the
11368 `#[fixed_stack_segment]` attribute.
11369 * The `externfn!` macro can be used to declare both a foreign function and
11370 a `#[fixed_stack_segment]` wrapper at once.
11371 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11372 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11373 * `priv` is disallowed everywhere except for struct fields and enum variants.
11374 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11375 * `ref` bindings in irrefutable patterns work correctly now.
11376 * `char` is now prevented from containing invalid code points.
11377 * Casting to `bool` is no longer allowed.
11378 * `\0` is now accepted as an escape in chars and strings.
11379 * `yield` is a reserved keyword.
11380 * `typeof` is a reserved keyword.
11381 * Crates may be imported by URL with `extern mod foo = "url";`.
11382 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11383 * Static vectors can be initialized with repeating elements,
11384 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11385 * Static structs can be initialized with functional record update,
11386 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11387 * `cfg!` can be used to conditionally execute code based on the crate
11388 configuration, similarly to `#[cfg(...)]`.
11389 * The `unnecessary_qualification` lint detects unneeded module
11390 prefixes (default: allow).
11391 * Arithmetic operations have been implemented on the SIMD types in
11392 `std::unstable::simd`.
11393 * Exchange allocation headers were removed, reducing memory usage.
11394 * `format!` implements a completely new, extensible, and higher-performance
11395 string formatting system. It will replace `fmt!`.
11396 * `print!` and `println!` write formatted strings (using the `format!`
11397 extension) to stdout.
11398 * `write!` and `writeln!` write formatted strings (using the `format!`
11399 extension) to the new Writers in `std::rt::io`.
11400 * The library section in which a function or static is placed may
11401 be specified with `#[link_section = "..."]`.
11402 * The `proto!` syntax extension for defining bounded message protocols
11404 * `macro_rules!` is hygienic for `let` declarations.
11405 * The `#[export_name]` attribute specifies the name of a symbol.
11406 * `unreachable!` can be used to indicate unreachable code, and fails
11410 * std: Transitioned to the new runtime, written in Rust.
11411 * std: Added an experimental I/O library, `rt::io`, based on the new
11413 * std: A new generic `range` function was added to the prelude, replacing
11414 `uint::range` and friends.
11415 * std: `range_rev` no longer exists. Since range is an iterator it can be
11416 reversed with `range(lo, hi).invert()`.
11417 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11418 renamed to `unwrap_or`.
11419 * std: The `iterator` module was renamed to `iter`.
11420 * std: Integral types now support the `checked_add`, `checked_sub`, and
11421 `checked_mul` operations for detecting overflow.
11422 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11424 * std: Methods are standardizing on conventions for casting methods:
11425 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11427 * std: The `CString` type in `c_str` provides new ways to convert to and
11429 * std: `DoubleEndedIterator` can yield elements in two directions.
11430 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11432 * std: `str::from_bytes` renamed to `str::from_utf8`.
11433 * std: `pop_opt` and `shift_opt` methods added to vectors.
11434 * std: The task-local data interface no longer uses @, and keys are
11435 no longer function pointers.
11436 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11437 * std: Added `SharedPort` to `comm`.
11438 * std: `Eq` has a default method for `ne`; only `eq` is required
11439 in implementations.
11440 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11441 is required in implementations.
11442 * std: `is_utf8` performance is improved, impacting many string functions.
11443 * std: `os::MemoryMap` provides cross-platform mmap.
11444 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11445 are not 'in-bounds' are considered undefined.
11446 * std: Many freestanding functions in `vec` removed in favor of methods.
11447 * std: Many freestanding functions on scalar types removed in favor of
11449 * std: Many options to task builders were removed since they don't make
11450 sense in the new scheduler design.
11451 * std: More containers implement `FromIterator` so can be created by the
11453 * std: More complete atomic types in `unstable::atomics`.
11454 * std: `comm::PortSet` removed.
11455 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11456 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11457 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11458 default implementations.
11459 * std: Various `from_str` functions were removed in favor of a generic
11460 `from_str` which is available in the prelude.
11461 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11462 * extra: `dlist`, the doubly-linked list was modernized.
11463 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11464 * extra: Added `glob` module, replacing `std::os::glob`.
11465 * extra: `rope` was removed.
11466 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11467 * extra: `net`, and `timer` were removed. The experimental replacements
11468 are `std::rt::io::net` and `std::rt::io::timer`.
11469 * extra: Iterators implemented for `SmallIntMap`.
11470 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11471 * extra: `SmallIntSet` removed. Use `BitvSet`.
11472 * extra: Performance of JSON parsing greatly improved.
11473 * extra: `semver` updated to SemVer 2.0.0.
11474 * extra: `term` handles more terminals correctly.
11475 * extra: `dbg` module removed.
11476 * extra: `par` module removed.
11477 * extra: `future` was cleaned up, with some method renames.
11478 * extra: Most free functions in `getopts` were converted to methods.
11481 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11482 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11483 similarly to gcc's `--march` flag.
11484 * rustc's performance compiling small crates is much better.
11485 * rustpkg has received many improvements.
11486 * rustpkg supports git tags as package IDs.
11487 * rustpkg builds into target-specific directories so it can be used for
11489 * The number of concurrent test tasks is controlled by the environment
11490 variable RUST_TEST_TASKS.
11491 * The test harness can now report metrics for benchmarks.
11492 * All tools have man pages.
11493 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11494 * The runtime uses jemalloc for allocations.
11495 * Segmented stacks are temporarily disabled as part of the transition to
11496 the new runtime. Stack overflows are possible!
11497 * A new documentation backend, rustdoc_ng, is available for use. It is
11498 still invoked through the normal `rustdoc` command.
11501 Version 0.7 (2013-07-03)
11502 =======================
11504 * ~2000 changes, numerous bugfixes
11507 * `impl`s no longer accept a visibility qualifier. Put them on methods
11509 * The borrow checker has been rewritten with flow-sensitivity, fixing
11510 many bugs and inconveniences.
11511 * The `self` parameter no longer implicitly means `&'self self`,
11512 and can be explicitly marked with a lifetime.
11513 * Overloadable compound operators (`+=`, etc.) have been temporarily
11514 removed due to bugs.
11515 * The `for` loop protocol now requires `for`-iterators to return `bool`
11516 so they compose better.
11517 * The `Durable` trait is replaced with the `'static` bounds.
11518 * Trait default methods work more often.
11519 * Structs with the `#[packed]` attribute have byte alignment and
11520 no padding between fields.
11521 * Type parameters bound by `Copy` must now be copied explicitly with
11522 the `copy` keyword.
11523 * It is now illegal to move out of a dereferenced unsafe pointer.
11524 * `Option<~T>` is now represented as a nullable pointer.
11525 * `@mut` does dynamic borrow checks correctly.
11526 * The `main` function is only detected at the topmost level of the crate.
11527 The `#[main]` attribute is still valid anywhere.
11528 * Struct fields may no longer be mutable. Use inherited mutability.
11529 * The `#[no_send]` attribute makes a type that would otherwise be
11531 * The `#[no_freeze]` attribute makes a type that would otherwise be
11533 * Unbounded recursion will abort the process after reaching the limit
11534 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11535 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11536 are never implicitly copyable.
11537 * `#[static_assert]` makes compile-time assertions about static bools.
11538 * At long last, 'argument modes' no longer exist.
11539 * The rarely used `use mod` statement no longer exists.
11541 * Syntax extensions
11542 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11544 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11545 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11546 `#[deriving(...)]`.
11547 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11548 and unsuffixed integer literals.
11551 * The `core` crate was renamed to `std`.
11552 * The `std` crate was renamed to `extra`.
11553 * More and improved documentation.
11554 * std: `iterator` module for external iterator objects.
11555 * Many old-style (internal, higher-order function) iterators replaced by
11556 implementations of `Iterator`.
11557 * std: Many old internal vector and string iterators,
11558 incl. `any`, `all`. removed.
11559 * std: The `finalize` method of `Drop` renamed to `drop`.
11560 * std: The `drop` method now takes `&mut self` instead of `&self`.
11561 * std: The prelude no longer re-exports any modules, only types and traits.
11562 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11563 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11564 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11565 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11566 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11567 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11568 * std: Many types implement `Clone`.
11569 * std: `path` type renamed to `Path`.
11570 * std: `mut` module and `Mut` type removed.
11571 * std: Many standalone functions removed in favor of methods and iterators
11572 in `vec`, `str`. In the future methods will also work as functions.
11573 * std: `reinterpret_cast` removed. Use `transmute`.
11574 * std: ascii string handling in `std::ascii`.
11575 * std: `Rand` is implemented for ~/@.
11576 * std: `run` module for spawning processes overhauled.
11577 * std: Various atomic types added to `unstable::atomic`.
11578 * std: Various types implement `Zero`.
11579 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11580 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11581 * std: Added `os::mkdir_recursive`.
11582 * std: Added `os::glob` function performs filesystems globs.
11583 * std: `FuzzyEq` renamed to `ApproxEq`.
11584 * std: `Map` now defines `pop` and `swap` methods.
11585 * std: `Cell` constructors converted to static methods.
11586 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11587 * extra: `flate` module moved from `std` to `extra`.
11588 * extra: `fileinput` module for iterating over a series of files.
11589 * extra: `Complex` number type and `complex` module.
11590 * extra: `Rational` number type and `rational` module.
11591 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11592 * extra: `term` uses terminfo now, is more correct.
11593 * extra: `arc` functions converted to methods.
11594 * extra: Implementation of fixed output size variations of SHA-2.
11597 * `unused_variables` lint mode for unused variables (default: warn).
11598 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11600 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11602 * `dead_assignment` lint mode for unread variables (default: warn).
11603 * `unnecessary_allocation` lint mode detects some heap allocations that are
11604 immediately borrowed so could be written without allocating (default: warn).
11605 * `missing_doc` lint mode (default: allow).
11606 * `unreachable_code` lint mode (default: warn).
11607 * The `rusti` command has been rewritten and a number of bugs addressed.
11608 * rustc outputs in color on more terminals.
11609 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11610 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11611 * Compiling with `-g` will make the binary record information about
11612 dynamic borrowcheck failures for debugging.
11613 * rustdoc has a nicer stylesheet.
11614 * Various improvements to rustdoc.
11615 * Improvements to rustpkg (see the detailed release notes).
11618 Version 0.6 (2013-04-03)
11619 ========================
11621 * ~2100 changes, numerous bugfixes
11624 * The self type parameter in traits is now spelled `Self`
11625 * The `self` parameter in trait and impl methods must now be explicitly
11626 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11627 * Static methods no longer require the `static` keyword and instead
11628 are distinguished by the lack of a `self` parameter
11629 * Replaced the `Durable` trait with the `'static` lifetime
11630 * The old closure type syntax with the trailing sigil has been
11631 removed in favor of the more consistent leading sigil
11632 * `super` is a keyword, and may be prefixed to paths
11633 * Trait bounds are separated with `+` instead of whitespace
11634 * Traits are implemented with `impl Trait for Type`
11635 instead of `impl Type: Trait`
11636 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11637 * The `export` keyword has finally been removed
11638 * The `move` keyword has been removed (see "Semantic changes")
11639 * The interior mutability qualifier on vectors, `[mut T]`, has been
11640 removed. Use `&mut [T]`, etc.
11641 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11642 * `fail` is no longer a keyword. Use `fail!()`
11643 * `assert` is no longer a keyword. Use `assert!()`
11644 * `log` is no longer a keyword. use `debug!`, etc.
11645 * 1-tuples may be represented as `(T,)`
11646 * Struct fields may no longer be `mut`. Use inherited mutability,
11647 `@mut T`, `core::mut` or `core::cell`
11648 * `extern mod { ... }` is no longer valid syntax for foreign
11649 function modules. Use extern blocks: `extern { ... }`
11650 * Newtype enums removed. Use tuple-structs.
11651 * Trait implementations no longer support visibility modifiers
11652 * Pattern matching over vectors improved and expanded
11653 * `const` renamed to `static` to correspond to lifetime name,
11654 and make room for future `static mut` unsafe mutable globals.
11655 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11656 * `Clone` implementations can be automatically generated with
11657 `#[deriving(Clone)]`
11658 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11659 instead of `foo as Bar`.
11660 * Fixed length vector types are now written as `[int, .. 3]`
11661 instead of `[int * 3]`.
11662 * Fixed length vector types can express the length as a constant
11663 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11666 * Types with owned pointers or custom destructors move by default,
11667 eliminating the `move` keyword
11668 * All foreign functions are considered unsafe
11669 * &mut is now unaliasable
11670 * Writes to borrowed @mut pointers are prevented dynamically
11672 * The name of the main function can be customized using #[main]
11673 * The default type of an inferred closure is &fn instead of @fn
11674 * `use` statements may no longer be "chained" - they cannot import
11675 identifiers imported by previous `use` statements
11676 * `use` statements are crate relative, importing from the "top"
11677 of the crate by default. Paths may be prefixed with `super::`
11678 or `self::` to change the search behavior.
11679 * Method visibility is inherited from the implementation declaration
11680 * Structural records have been removed
11681 * Many more types can be used in static items, including enums
11682 'static-lifetime pointers and vectors
11683 * Pattern matching over vectors improved and expanded
11684 * Typechecking of closure types has been overhauled to
11685 improve inference and eliminate unsoundness
11686 * Macros leave scope at the end of modules, unless that module is
11687 tagged with #[macro_escape]
11690 * Added big integers to `std::bigint`
11691 * Removed `core::oldcomm` module
11692 * Added pipe-based `core::comm` module
11693 * Numeric traits have been reorganized under `core::num`
11694 * `vec::slice` finally returns a slice
11695 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11696 * Containers reorganized around traits in `core::container`
11697 * `core::dvec` removed, `~[T]` is a drop-in replacement
11698 * `core::send_map` renamed to `core::hashmap`
11699 * `std::map` removed; replaced with `core::hashmap`
11700 * `std::treemap` reimplemented as an owned balanced tree
11701 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11702 * `core::trie` added as a fast ordered map for integer keys
11703 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11704 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11705 overload the comparison operators, whereas `TotalOrd` is used
11706 by certain container types
11709 * Replaced the 'cargo' package manager with 'rustpkg'
11710 * Added all-purpose 'rust' tool
11711 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11712 * rustc now *attempts* to offer spelling suggestions
11713 * Improved support for ARM and Android
11714 * Preliminary MIPS backend
11715 * Improved foreign function ABI implementation for x86, x86_64
11716 * Various memory usage improvements
11717 * Rust code may be embedded in foreign code under limited circumstances
11718 * Inline assembler supported by new asm!() syntax extension.
11721 Version 0.5 (2012-12-21)
11722 ===========================
11724 * ~900 changes, numerous bugfixes
11727 * Removed `<-` move operator
11728 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11729 * Removed old fixed length vector syntax - `[T]/N`
11730 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11731 * Macros may now expand to items and statements
11732 * `a.b()` is always parsed as a method call, never as a field projection
11733 * `Eq` and `IterBytes` implementations can be automatically generated
11734 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11735 * Removed the special crate language for `.rc` files
11736 * Function arguments may consist of any irrefutable pattern
11739 * `&` and `~` pointers may point to objects
11740 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11741 * Enum variants may be structs
11742 * Destructors can be added to all nominal types with the Drop trait
11743 * Structs and nullary enum variants may be constants
11744 * Values that cannot be implicitly copied are now automatically moved
11745 without writing `move` explicitly
11746 * `&T` may now be coerced to `*T`
11747 * Coercions happen in `let` statements as well as function calls
11748 * `use` statements now take crate-relative paths
11749 * The module and type namespaces have been merged so that static
11750 method names can be resolved under the trait in which they are
11753 * Improved support for language features
11754 * Trait inheritance works in many scenarios
11755 * More support for explicit self arguments in methods - `self`, `&self`
11756 `@self`, and `~self` all generally work as expected
11757 * Static methods work in more situations
11758 * Experimental: Traits may declare default methods for the implementations
11762 * New condition handling system in `core::condition`
11763 * Timsort added to `std::sort`
11764 * New priority queue, `std::priority_queue`
11765 * Pipes for serializable types, `std::flatpipes'
11766 * Serialization overhauled to be trait-based
11767 * Expanded `getopts` definitions
11768 * Moved futures to `std`
11769 * More functions are pure now
11770 * `core::comm` renamed to `oldcomm`. Still deprecated
11771 * `rustdoc` and `cargo` are libraries now
11774 * Added a preliminary REPL, `rusti`
11775 * License changed from MIT to dual MIT/APL2
11778 Version 0.4 (2012-10-15)
11779 ==========================
11781 * ~2000 changes, numerous bugfixes
11784 * All keywords are now strict and may not be used as identifiers anywhere
11785 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11786 'of', 'with', 'to', 'class'.
11787 * Classes are replaced with simpler structs
11788 * Explicit method self types
11789 * `ret` became `return` and `alt` became `match`
11790 * `import` is now `use`; `use is now `extern mod`
11791 * `extern mod { ... }` is now `extern { ... }`
11792 * `use mod` is the recommended way to import modules
11793 * `pub` and `priv` replace deprecated export lists
11794 * The syntax of `match` pattern arms now uses fat arrow (=>)
11795 * `main` no longer accepts an args vector; use `os::args` instead
11798 * Trait implementations are now coherent, ala Haskell typeclasses
11799 * Trait methods may be static
11800 * Argument modes are deprecated
11801 * Borrowed pointers are much more mature and recommended for use
11802 * Strings and vectors in the static region are stored in constant memory
11803 * Typestate was removed
11804 * Resolution rewritten to be more reliable
11805 * Support for 'dual-mode' data structures (freezing and thawing)
11808 * Most binary operators can now be overloaded via the traits in
11810 * `std::net::url` for representing URLs
11811 * Sendable hash maps in `core::send_map`
11812 * `core::task' gained a (currently unsafe) task-local storage API
11815 * An efficient new intertask communication primitive called the pipe,
11816 along with a number of higher-level channel types, in `core::pipes`
11817 * `std::arc`, an atomically reference counted, immutable, shared memory
11819 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11820 * Futures are now based on pipes and sendable
11821 * More robust linked task failure
11822 * Improved task builder API
11825 * Improved error reporting
11826 * Preliminary JIT support
11827 * Preliminary work on precise GC
11828 * Extensive architectural improvements to rustc
11829 * Begun a transition away from buggy C++-based reflection (shape) code to
11830 Rust-based (visitor) code
11831 * All hash functions and tables converted to secure, randomized SipHash
11834 Version 0.3 (2012-07-12)
11835 ========================
11837 * ~1900 changes, numerous bugfixes
11839 * New coding conveniences
11840 * Integer-literal suffix inference
11841 * Per-item control over warnings, errors
11842 * #[cfg(windows)] and #[cfg(unix)] attributes
11843 * Documentation comments
11844 * More compact closure syntax
11845 * 'do' expressions for treating higher-order functions as
11847 * *-patterns (wildcard extended to all constructor fields)
11850 * Name resolution pass and exhaustiveness checker rewritten
11851 * Region pointers and borrow checking supersede alias
11853 * Init-ness checking is now provided by a region-based liveness
11854 pass instead of the typestate pass; same for last-use analysis
11855 * Extensive work on region pointers
11857 * Experimental new language features
11858 * Slices and fixed-size, interior-allocated vectors
11859 * #!-comments for lang versioning, shell execution
11860 * Destructors and iface implementation for classes;
11861 type-parameterized classes and class methods
11862 * 'const' type kind for types that can be used to implement
11863 shared-memory concurrency patterns
11867 * Removal of various obsolete features
11868 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11869 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11871 * Constructs: do-while loops ('do' repurposed), fn binding,
11872 resources (replaced by destructors)
11874 * Compiler reorganization
11875 * Syntax-layer of compiler split into separate crate
11876 * Clang (from LLVM project) integrated into build
11877 * Typechecker split into sub-modules
11880 * New time functions
11881 * Extension methods for many built-in types
11882 * Arc: atomic-refcount read-only / exclusive-use shared cells
11883 * Par: parallel map and search routines
11884 * Extensive work on libuv interface
11885 * Much vector code moved to libraries
11886 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11887 #include, #include_str, #include_bin
11889 * Tool improvements
11890 * Cargo automatically resolves dependencies
11893 Version 0.2 (2012-03-29)
11894 =========================
11896 * >1500 changes, numerous bugfixes
11898 * New docs and doc tooling
11900 * New port: FreeBSD x86_64
11902 * Compilation model enhancements
11903 * Generics now specialized, multiply instantiated
11904 * Functions now inlined across separate crates
11906 * Scheduling, stack and threading fixes
11907 * Noticeably improved message-passing performance
11908 * Explicit schedulers
11912 * Experimental new language features
11913 * Operator overloading
11917 * Various language extensions
11918 * C-callback function types: 'crust fn ...'
11919 * Infinite-loop construct: 'loop { ... }'
11920 * Shorten 'mutable' to 'mut'
11921 * Required mutable-local qualifier: 'let mut ...'
11922 * Basic glob-exporting: 'export foo::*;'
11923 * Alt now exhaustive, 'alt check' for runtime-checked
11924 * Block-function form of 'for' loop, with 'break' and 'ret'.
11927 * AST quasi-quote syntax extension
11928 * Revived libuv interface
11929 * New modules: core::{future, iter}, std::arena
11930 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11931 * Extensive cleanup, regularization in libstd, libcore
11934 Version 0.1 (2012-01-20)
11935 ===============================
11937 * Most language features work, including:
11938 * Unique pointers, unique closures, move semantics
11939 * Interface-constrained generics
11940 * Static interface dispatch
11942 * Multithread task scheduling
11943 * Typestate predicates
11944 * Failure unwinding, destructors
11945 * Pattern matching and destructuring assignment
11946 * Lightweight block-lambda syntax
11947 * Preliminary macro-by-example
11949 * Compiler works with the following configurations:
11950 * Linux: x86 and x86_64 hosts and targets
11951 * macOS: x86 and x86_64 hosts and targets
11952 * Windows: x86 hosts and targets
11954 * Cross compilation / multi-target configuration supported.
11956 * Preliminary API-documentation and package-management tools included.
11960 * Documentation is incomplete.
11962 * Performance is below intended target.
11964 * Standard library APIs are subject to extensive change, reorganization.
11966 * Language-level versioning is not yet operational - future code will
11967 break unexpectedly.