1 Version 1.64.0 (2022-09-22)
2 ===========================
6 - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
7 - 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/)
8 - 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.
12 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
13 - Refer to Rust's [platform support page][platform-support-doc] for more
14 information on Rust's tiered platform support.
15 - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
16 - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
17 - [Fix repr(align) enum handling](https://github.com/rust-lang/rust/pull/96814/)
18 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
22 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
23 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
24 - [Enforce that layout size fits in isize in Layout](https://github.com/rust-lang/rust/pull/95295/)
25 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
26 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
27 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
28 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
29 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
30 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
35 - [`ffi::CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html)
36 - [`ffi::CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html)
37 - [`ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesWithNulError.html)
38 - [`ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromVecWithNulError.html)
39 - [`ffi::IntoStringError`](https://doc.rust-lang.org/stable/std/ffi/struct.IntoStringError.html)
40 - [`ffi::NulError`](https://doc.rust-lang.org/stable/std/ffi/struct.NulError.html)
41 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
42 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
43 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
44 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
45 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
46 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
47 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
48 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
49 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
50 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
51 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
52 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
53 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
54 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
55 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
56 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
57 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
58 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
59 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
60 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
61 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
62 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
63 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
64 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
65 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
66 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
67 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
68 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
69 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
70 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
71 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
72 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
74 These APIs are now usable in const contexts:
76 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
80 - Packages can now inherit settings from the workspace so that the settings
81 can be centralized in one place. See
82 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
84 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
85 for more details on how to define these common settings.
86 [#10859](https://github.com/rust-lang/cargo/pull/10859)
87 - Cargo commands can now accept multiple `--target` flags to build for
88 multiple targets at once, and the
89 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
90 config option may now take an array of multiple targets.
91 [#10766](https://github.com/rust-lang/cargo/pull/10766)
92 - The `--jobs` argument can now take a negative number to count backwards from
94 [#10844](https://github.com/rust-lang/cargo/pull/10844)
95 - `cargo add` will now update `Cargo.lock`.
96 [#10902](https://github.com/rust-lang/cargo/pull/10902)
98 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
99 flag to `cargo rustc` to override the crate type.
100 [#10838](https://github.com/rust-lang/cargo/pull/10838)
101 - Significantly improved the performance fetching git dependencies from GitHub
102 when using a hash in the `rev` field.
103 [#10079](https://github.com/rust-lang/cargo/pull/10079)
107 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
111 - 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/)
112 - [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.
113 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
114 - [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.
115 - [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.
116 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
117 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
118 - 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/).
119 - [`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.
124 These changes do not affect any public interfaces of Rust, but they represent
125 significant improvements to the performance or internals of rustc and related
128 - 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/)
129 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
130 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
131 - Many improvements to generated code for derives, including performance improvements:
132 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
133 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
134 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
135 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
136 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
137 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
138 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
139 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
140 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
141 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
142 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
144 Version 1.63.0 (2022-08-11)
145 ==========================
149 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
150 - [Modify MIR building to drop repeat expressions with length zero.][95953]
151 - [Remove label/lifetime shadowing warnings.][96296]
152 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
153 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
154 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
155 - [lub: don't bail out due to empty binders.][97867]
159 - [Stabilize the `bundle` native library modifier,][95818] also removing the
160 deprecated `static-nobundle` linking kind.
161 - [Add Apple WatchOS compile targets\*.][95243]
162 - [Add a Windows application manifest to rustc-main.][96737]
164 \* Refer to Rust's [platform support page][platform-support-doc] for more
165 information on Rust's tiered platform support.
169 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
170 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
171 - [`impl Read and Write for VecDeque<u8>`.][95632]
172 - [STD support for the Nintendo 3DS.][95897]
173 - [Use rounding in float to Duration conversion methods.][96051]
174 - [Make write/print macros eagerly drop temporaries.][96455]
175 - [Implement internal traits that enable `[OsStr]::join`.][96881]
176 - [Implement `Hash` for `core::alloc::Layout`.][97034]
177 - [Add capacity documentation for `OsString`.][97202]
178 - [Put a bound on collection misbehavior.][97316]
179 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
180 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
181 - [Document Rust's stance on `/proc/self/mem`.][97837]
188 - [`BinaryHeap::try_reserve`]
189 - [`BinaryHeap::try_reserve_exact`]
190 - [`OsString::try_reserve`]
191 - [`OsString::try_reserve_exact`]
192 - [`PathBuf::try_reserve`]
193 - [`PathBuf::try_reserve_exact`]
194 - [`Path::try_exists`]
195 - [`Ref::filter_map`]
196 - [`RefMut::filter_map`]
197 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
198 - [`ToOwned::clone_into`]
199 - [`Ipv6Addr::to_ipv4_mapped`]
201 - [`unix::io::BorrowedFd<'fd>`]
202 - [`unix::io::OwnedFd`]
203 - [`windows::io::AsHandle`]
204 - [`windows::io::BorrowedHandle<'handle>`]
205 - [`windows::io::OwnedHandle`]
206 - [`windows::io::HandleOrInvalid`]
207 - [`windows::io::HandleOrNull`]
208 - [`windows::io::InvalidHandleError`]
209 - [`windows::io::NullHandleError`]
210 - [`windows::io::AsSocket`]
211 - [`windows::io::BorrowedSocket<'handle>`]
212 - [`windows::io::OwnedSocket`]
215 - [`thread::ScopedJoinHandle`]
217 These APIs are now usable in const contexts:
219 - [`array::from_ref`]
220 - [`slice::from_ref`]
221 - [`intrinsics::copy`]
222 - [`intrinsics::copy_nonoverlapping`]
223 - [`<*const T>::copy_to`]
224 - [`<*const T>::copy_to_nonoverlapping`]
225 - [`<*mut T>::copy_to`]
226 - [`<*mut T>::copy_to_nonoverlapping`]
227 - [`<*mut T>::copy_from`]
228 - [`<*mut T>::copy_from_nonoverlapping`]
230 - [`Utf8Error::error_len`]
231 - [`Utf8Error::valid_up_to`]
238 - [Stabilize the `--config path` command-line argument.][cargo/10755]
239 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
244 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
245 errors for invalid attribute arguments that were previously ignored.
246 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
247 duration can differ slightly from what it was.
252 These changes provide no direct user facing benefits, but represent significant
253 improvements to the internals and overall performance of rustc
256 - [Prepare Rust for LLVM opaque pointers.][94214]
258 [94214]: https://github.com/rust-lang/rust/pull/94214/
259 [94530]: https://github.com/rust-lang/rust/pull/94530/
260 [94954]: https://github.com/rust-lang/rust/pull/94954/
261 [95243]: https://github.com/rust-lang/rust/pull/95243/
262 [95565]: https://github.com/rust-lang/rust/pull/95565/
263 [95632]: https://github.com/rust-lang/rust/pull/95632/
264 [95818]: https://github.com/rust-lang/rust/pull/95818/
265 [95897]: https://github.com/rust-lang/rust/pull/95897/
266 [95953]: https://github.com/rust-lang/rust/pull/95953/
267 [96051]: https://github.com/rust-lang/rust/pull/96051/
268 [96296]: https://github.com/rust-lang/rust/pull/96296/
269 [96455]: https://github.com/rust-lang/rust/pull/96455/
270 [96737]: https://github.com/rust-lang/rust/pull/96737/
271 [96868]: https://github.com/rust-lang/rust/pull/96868/
272 [96881]: https://github.com/rust-lang/rust/pull/96881/
273 [96885]: https://github.com/rust-lang/rust/pull/96885/
274 [96959]: https://github.com/rust-lang/rust/pull/96959/
275 [97034]: https://github.com/rust-lang/rust/pull/97034/
276 [97202]: https://github.com/rust-lang/rust/pull/97202/
277 [97316]: https://github.com/rust-lang/rust/pull/97316/
278 [97652]: https://github.com/rust-lang/rust/pull/97652/
279 [97675]: https://github.com/rust-lang/rust/pull/97675/
280 [97803]: https://github.com/rust-lang/rust/pull/97803/
281 [97837]: https://github.com/rust-lang/rust/pull/97837/
282 [97867]: https://github.com/rust-lang/rust/pull/97867/
283 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
284 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
286 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
287 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
288 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
289 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
290 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
291 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
292 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
293 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
294 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
295 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
296 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
297 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
298 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
299 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
300 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
301 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
302 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
303 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
304 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
305 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
306 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
307 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
308 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
309 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
310 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
311 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
312 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
313 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
314 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
315 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
317 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
318 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
319 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
320 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
321 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
322 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
323 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
324 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
325 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
326 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
327 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
328 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
329 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
330 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
331 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
332 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
334 Version 1.62.1 (2022-07-19)
335 ==========================
337 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
338 library, and also mitigates a CPU vulnerability on Intel SGX.
340 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
341 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
342 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
343 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
344 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
346 [98608]: https://github.com/rust-lang/rust/issues/98608
347 [98890]: https://github.com/rust-lang/rust/issues/98890
348 [98950]: https://github.com/rust-lang/rust/pull/98950
349 [98126]: https://github.com/rust-lang/rust/pull/98126
350 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
352 Version 1.62.0 (2022-06-30)
353 ==========================
358 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
359 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
360 - [Fix constants not getting dropped if part of a diverging expression][94775]
361 - [Support unit struct/enum variant in destructuring assignment][95380]
362 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
363 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
368 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
369 - [Make `unaligned_references` lint deny-by-default][95372]
370 This lint is also a future compatibility lint, and is expected to eventually
372 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
373 - [Reject `#[thread_local]` attribute on non-static items][95006]
374 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
375 - [Implement a lint to warn about unused macro rules][96150]
376 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
378 \* Refer to Rust's [platform support page][platform-support-doc] for more
379 information on Rust's tiered platform support.
384 - [Windows: Use a pipe relay for chaining pipes][95841]
385 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
386 - [Replace RwLock by a futex based one on Linux][95801]
387 - [std: directly use pthread in UNIX parker implementation][96393]
392 - [`bool::then_some`]
396 - [`windows::CommandExt::raw_arg`]
397 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
398 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
399 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
400 - [`FusedIterator for EncodeWide`]
401 - [RDM intrinsics on aarch64][stdarch/1285]
406 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
411 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
413 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
414 - Package ID specs now support `name@version` syntax in addition to the
415 previous `name:version` to align with the behavior in `cargo add` and other
416 tools. `cargo install` and `cargo yank` also now support this syntax so the
417 version does not need to passed as a separate flag.
418 - The `git` and `registry` directories in Cargo's home directory (usually
419 `~/.cargo`) are now marked as cache directories so that they are not
420 included in backups or content indexing (on Windows).
421 - Added automatic `@` argfile support, which will use "response files" if the
422 command-line to `rustc` exceeds the operating system's limit.
427 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
428 the same as the host target.
429 [#10594](https://github.com/rust-lang/cargo/pull/10594)
430 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
431 - [rustdoc: Remove .woff font files][96279]
432 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
433 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
434 complete synchronously][95469].
439 - [Unify ReentrantMutex implementations across all platforms][96042]
441 These changes provide no direct user facing benefits, but represent significant
442 improvements to the internals and overall performance of rustc
445 [93313]: https://github.com/rust-lang/rust/pull/93313/
446 [93969]: https://github.com/rust-lang/rust/pull/93969/
447 [94206]: https://github.com/rust-lang/rust/pull/94206/
448 [94457]: https://github.com/rust-lang/rust/pull/94457/
449 [94775]: https://github.com/rust-lang/rust/pull/94775/
450 [94872]: https://github.com/rust-lang/rust/pull/94872/
451 [95006]: https://github.com/rust-lang/rust/pull/95006/
452 [95035]: https://github.com/rust-lang/rust/pull/95035/
453 [95346]: https://github.com/rust-lang/rust/pull/95346/
454 [95372]: https://github.com/rust-lang/rust/pull/95372/
455 [95380]: https://github.com/rust-lang/rust/pull/95380/
456 [95431]: https://github.com/rust-lang/rust/pull/95431/
457 [95469]: https://github.com/rust-lang/rust/pull/95469/
458 [95705]: https://github.com/rust-lang/rust/pull/95705/
459 [95801]: https://github.com/rust-lang/rust/pull/95801/
460 [95819]: https://github.com/rust-lang/rust/pull/95819/
461 [95841]: https://github.com/rust-lang/rust/pull/95841/
462 [96042]: https://github.com/rust-lang/rust/pull/96042/
463 [96150]: https://github.com/rust-lang/rust/pull/96150/
464 [96268]: https://github.com/rust-lang/rust/pull/96268/
465 [96279]: https://github.com/rust-lang/rust/pull/96279/
466 [96393]: https://github.com/rust-lang/rust/pull/96393/
467 [96436]: https://github.com/rust-lang/rust/pull/96436/
468 [96557]: https://github.com/rust-lang/rust/pull/96557/
469 [96630]: https://github.com/rust-lang/rust/pull/96630/
471 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
472 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
473 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
474 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
475 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
476 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
477 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
478 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
479 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
480 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
482 Version 1.61.0 (2022-05-19)
483 ==========================
488 - [`const fn` signatures can now include generic trait bounds][93827]
489 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
490 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
491 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
496 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
497 - [The `char` type is now described as UTF-32 in debuginfo][89887]
498 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
499 - X86 [`#[target_feature = "adx"]` is now stable][93745]
504 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
505 - [`#[ignore = "…"]` messages are printed when running tests][92714]
506 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
507 - [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.
508 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
509 - [`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.
514 - [`Pin::static_mut`]
515 - [`Pin::static_ref`]
516 - [`Vec::retain_mut`]
517 - [`VecDeque::retain_mut`]
518 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
519 - [`std::os::unix::net::SocketAddr::from_pathname`]
520 - [`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.
521 - [`std::thread::JoinHandle::is_finished`]
523 These APIs are now usable in const contexts:
525 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
526 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
527 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
528 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
529 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
530 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
531 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
532 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
533 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
538 No feature changes, but see compatibility notes.
543 - 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
544 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
545 - (less common) or be updated to use the [`+whole-archive`] modifier.
546 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
547 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
548 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
549 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
550 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
551 - [`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`.
552 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
557 These changes provide no direct user facing benefits, but represent significant
558 improvements to the internals and overall performance of rustc
561 - [debuginfo: Refactor debuginfo generation for types][94261]
562 - [Remove the everybody loops pass][93913]
564 [88375]: https://github.com/rust-lang/rust/pull/88375/
565 [89887]: https://github.com/rust-lang/rust/pull/89887/
566 [90621]: https://github.com/rust-lang/rust/pull/90621/
567 [92285]: https://github.com/rust-lang/rust/pull/92285/
568 [92472]: https://github.com/rust-lang/rust/pull/92472/
569 [92697]: https://github.com/rust-lang/rust/pull/92697/
570 [92714]: https://github.com/rust-lang/rust/pull/92714/
571 [92911]: https://github.com/rust-lang/rust/pull/92911/
572 [93263]: https://github.com/rust-lang/rust/pull/93263/
573 [93745]: https://github.com/rust-lang/rust/pull/93745/
574 [93827]: https://github.com/rust-lang/rust/pull/93827/
575 [93901]: https://github.com/rust-lang/rust/pull/93901/
576 [93913]: https://github.com/rust-lang/rust/pull/93913/
577 [93965]: https://github.com/rust-lang/rust/pull/93965/
578 [94081]: https://github.com/rust-lang/rust/pull/94081/
579 [94261]: https://github.com/rust-lang/rust/pull/94261/
580 [94295]: https://github.com/rust-lang/rust/pull/94295/
581 [94832]: https://github.com/rust-lang/rust/pull/94832/
582 [95016]: https://github.com/rust-lang/rust/pull/95016/
583 [95251]: https://github.com/rust-lang/rust/pull/95251/
584 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
585 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
586 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
587 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
588 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
589 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
590 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
591 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
592 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
593 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
594 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
595 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
596 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
597 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
598 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
599 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
600 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
601 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
602 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
603 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
604 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
605 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
608 Version 1.60.0 (2022-04-07)
609 ==========================
613 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
614 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
618 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
619 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
620 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
621 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
622 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
623 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
624 - [Fix invalid removal of newlines from doc comments][92357]
625 - [Add kernel target for RustyHermit][92670]
626 - [Deny mixing bin crate type with lib crate types][92933]
627 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
628 - [Upgrade to LLVM 14][93577]
630 \* Refer to Rust's [platform support page][platform-support-doc] for more
631 information on Rust's tiered platform support.
635 - [Guarantee call order for `sort_by_cached_key`][89621]
636 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
637 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
638 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
639 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
643 - [`Arc::new_cyclic`][arc_new_cyclic]
644 - [`Rc::new_cyclic`][rc_new_cyclic]
645 - [`slice::EscapeAscii`][slice_escape_ascii]
646 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
647 - [`u8::escape_ascii`][u8_escape_ascii]
648 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
649 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
650 - [`MaybeUninit::assume_init_read`][assume_init_read]
651 - [`i8::abs_diff`][i8_abs_diff]
652 - [`i16::abs_diff`][i16_abs_diff]
653 - [`i32::abs_diff`][i32_abs_diff]
654 - [`i64::abs_diff`][i64_abs_diff]
655 - [`i128::abs_diff`][i128_abs_diff]
656 - [`isize::abs_diff`][isize_abs_diff]
657 - [`u8::abs_diff`][u8_abs_diff]
658 - [`u16::abs_diff`][u16_abs_diff]
659 - [`u32::abs_diff`][u32_abs_diff]
660 - [`u64::abs_diff`][u64_abs_diff]
661 - [`u128::abs_diff`][u128_abs_diff]
662 - [`usize::abs_diff`][usize_abs_diff]
663 - [`Display for io::ErrorKind`][display_error_kind]
664 - [`From<u8> for ExitCode`][from_u8_exit_code]
665 - [`Not for !` (the "never" type)][not_never]
666 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
667 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
671 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
672 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
673 - [Stabilize namespaced and weak dependency features.][cargo/10269]
674 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
675 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
679 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
680 - [Drop rustc-docs from complete profile][93742]
681 - [bootstrap: tidy up flag handling for llvm build][93918]
685 - [Remove compiler-rt linking hack on Android][83822]
686 - [Mitigations for platforms with non-monotonic clocks have been removed from
687 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
688 instant is not guaranteed to be greater than an earlier instant anymore.
689 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
690 saturating to `0` instead][89926]. In the real world the panic happened mostly
691 on platforms with buggy monotonic clock implementations rather than catching
692 programming errors like reversing the start and end times. Such programming
693 errors will now results in `0` rather than a panic.
694 - In a future release we're planning to increase the baseline requirements for
695 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
696 your feedback in [PR #95026][95026].
701 These changes provide no direct user facing benefits, but represent significant
702 improvements to the internals and overall performance of rustc
705 - [Switch all libraries to the 2021 edition][92068]
707 [83822]: https://github.com/rust-lang/rust/pull/83822
708 [86374]: https://github.com/rust-lang/rust/pull/86374
709 [87487]: https://github.com/rust-lang/rust/pull/87487
710 [89621]: https://github.com/rust-lang/rust/pull/89621
711 [89926]: https://github.com/rust-lang/rust/pull/89926
712 [90132]: https://github.com/rust-lang/rust/pull/90132
713 [90247]: https://github.com/rust-lang/rust/pull/90247
714 [91606]: https://github.com/rust-lang/rust/pull/91606
715 [92068]: https://github.com/rust-lang/rust/pull/92068
716 [92300]: https://github.com/rust-lang/rust/pull/92300
717 [92357]: https://github.com/rust-lang/rust/pull/92357
718 [92383]: https://github.com/rust-lang/rust/pull/92383
719 [92630]: https://github.com/rust-lang/rust/pull/92630
720 [92670]: https://github.com/rust-lang/rust/pull/92670
721 [92800]: https://github.com/rust-lang/rust/pull/92800
722 [92933]: https://github.com/rust-lang/rust/pull/92933
723 [93566]: https://github.com/rust-lang/rust/pull/93566
724 [93577]: https://github.com/rust-lang/rust/pull/93577
725 [93658]: https://github.com/rust-lang/rust/pull/93658
726 [93742]: https://github.com/rust-lang/rust/pull/93742
727 [93824]: https://github.com/rust-lang/rust/pull/93824
728 [93918]: https://github.com/rust-lang/rust/pull/93918
729 [95026]: https://github.com/rust-lang/rust/pull/95026
731 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
732 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
733 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
734 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
735 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
737 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
738 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
739 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
740 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
741 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
742 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
743 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
744 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
745 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
746 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
747 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
748 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
749 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
750 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
751 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
752 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
753 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
754 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
755 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
756 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
757 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
758 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
759 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
760 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
761 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
763 Version 1.59.0 (2022-02-24)
764 ==========================
769 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
770 - [Stabilize destructuring assignment][90521]
771 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
772 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
777 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
778 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
779 - [Fix sparc64 ABI for aggregates with floating point members][91003]
780 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
781 - [Add support for riscv64gc-unknown-freebsd][91284]
782 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
783 - [Soft disable incremental compilation][94124]
785 This release disables incremental compilation, unless the user has explicitly
786 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
787 This is due to a known and relatively frequently occurring bug in incremental
788 compilation, which causes builds to issue internal compiler errors. This
789 particular bug is already fixed on nightly, but that fix has not yet rolled out
790 to stable and is deemed too risky for a direct stable backport.
792 As always, we encourage users to test with nightly and report bugs so that we
793 can track failures and fix issues earlier.
795 See [94124] for more details.
797 [94124]: https://github.com/rust-lang/rust/issues/94124
802 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
807 - [`std::thread::available_parallelism`][available_parallelism]
808 - [`Result::copied`][result-copied]
809 - [`Result::cloned`][result-cloned]
810 - [`arch::asm!`][asm]
811 - [`arch::global_asm!`][global_asm]
812 - [`ops::ControlFlow::is_break`][is_break]
813 - [`ops::ControlFlow::is_continue`][is_continue]
814 - [`TryFrom<char> for u8`][try_from_char_u8]
815 - [`char::TryFromCharError`][try_from_char_err]
816 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
818 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
819 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
820 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
821 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
822 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
823 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
824 - [`DoubleEndedIterator for ToLowercase`][lowercase]
825 - [`DoubleEndedIterator for ToUppercase`][uppercase]
826 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
827 - [`UnwindSafe for Once`][unwindsafe_once]
828 - [`RefUnwindSafe for Once`][refunwindsafe_once]
829 - [armv8 neon intrinsics for aarch64][stdarch/1266]
833 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
834 - [`mem::MaybeUninit::assume_init`][muninit_init]
835 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
836 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
841 - [Stabilize the `strip` profile option][cargo/10088]
842 - [Stabilize future-incompat-report][cargo/10165]
843 - [Support abbreviating `--release` as `-r`][cargo/10133]
844 - [Support `term.quiet` configuration][cargo/10152]
845 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
850 - [Refactor weak symbols in std::sys::unix][90846]
851 This may add new, versioned, symbols when building with a newer glibc, as the
852 standard library uses weak linkage rather than dynamically attempting to load
853 certain symbols at runtime.
854 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
855 This adds a future compatibility lint to supporting the use of cfg_attr
856 wrapping either crate_type or crate_name specification within Rust files;
857 it is recommended that users migrate to setting the equivalent command line
859 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
860 This may expose new names, leading to conflicts with preexisting names in a
861 given namespace and a compilation failure.
862 - [Cargo will document libraries before binaries.][cargo/10172]
863 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
864 - [Weaken guarantee around advancing underlying iterators in zip][83791]
865 - [Make split_inclusive() on an empty slice yield an empty output][89825]
866 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
867 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
872 These changes provide no direct user facing benefits, but represent significant
873 improvements to the internals and overall performance of rustc
876 - [Fix many cases of normalization-related ICEs][91255]
877 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
878 - [Store liveness in interval sets for region inference][90637]
880 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
881 unstable feature.][91867]
883 [91867]: https://github.com/rust-lang/rust/issues/91867
884 [83744]: https://github.com/rust-lang/rust/pull/83744/
885 [83791]: https://github.com/rust-lang/rust/pull/83791/
886 [85013]: https://github.com/rust-lang/rust/pull/85013/
887 [89825]: https://github.com/rust-lang/rust/pull/89825/
888 [89999]: https://github.com/rust-lang/rust/pull/89999/
889 [90128]: https://github.com/rust-lang/rust/pull/90128/
890 [90207]: https://github.com/rust-lang/rust/pull/90207/
891 [90521]: https://github.com/rust-lang/rust/pull/90521/
892 [90586]: https://github.com/rust-lang/rust/pull/90586/
893 [90637]: https://github.com/rust-lang/rust/pull/90637/
894 [90833]: https://github.com/rust-lang/rust/pull/90833/
895 [90846]: https://github.com/rust-lang/rust/pull/90846/
896 [91003]: https://github.com/rust-lang/rust/pull/91003/
897 [91172]: https://github.com/rust-lang/rust/pull/91172/
898 [91255]: https://github.com/rust-lang/rust/pull/91255/
899 [91284]: https://github.com/rust-lang/rust/pull/91284/
900 [91535]: https://github.com/rust-lang/rust/pull/91535/
901 [91593]: https://github.com/rust-lang/rust/pull/91593/
902 [91728]: https://github.com/rust-lang/rust/pull/91728/
903 [91878]: https://github.com/rust-lang/rust/pull/91878/
904 [91896]: https://github.com/rust-lang/rust/pull/91896/
905 [91926]: https://github.com/rust-lang/rust/pull/91926/
906 [91984]: https://github.com/rust-lang/rust/pull/91984/
907 [92020]: https://github.com/rust-lang/rust/pull/92020/
908 [92034]: https://github.com/rust-lang/rust/pull/92034/
909 [92137]: https://github.com/rust-lang/rust/pull/92137/
910 [92483]: https://github.com/rust-lang/rust/pull/92483/
911 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
912 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
913 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
914 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
915 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
916 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
917 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
918 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
920 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
921 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
922 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
923 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
924 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
925 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
926 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
927 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
928 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
929 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
930 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
931 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
932 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
933 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
934 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
935 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
936 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
937 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
938 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
939 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
940 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
941 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
942 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
943 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
944 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
945 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
947 Version 1.58.1 (2022-01-19)
948 ===========================
950 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
951 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
952 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
953 * [Fix wrong error message displayed when some imports are missing][91254]
954 * [Fix rustfmt not formatting generated files from stdin][92912]
956 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
957 [91254]: https://github.com/rust-lang/rust/pull/91254
958 [92912]: https://github.com/rust-lang/rust/pull/92912
959 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
960 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
962 Version 1.58.0 (2022-01-13)
963 ==========================
968 - [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.
969 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
970 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
975 - [Add LLVM CFI support to the Rust compiler][89652]
976 - [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.
977 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
978 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
979 - [Update the minimum external LLVM to 12][90175]
980 - [Add `x86_64-unknown-none` at Tier 3*][89062]
981 - [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.
982 - [Don't abort compilation after giving a lint error][87337]
983 - [Error messages point at the source of trait bound obligations in more places][89580]
985 \* Refer to Rust's [platform support page][platform-support-doc] for more
986 information on Rust's tiered platform support.
991 - [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.
992 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
993 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
994 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
995 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
996 - [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).
1001 - [`Metadata::is_symlink`]
1002 - [`Path::is_symlink`]
1003 - [`{integer}::saturating_div`]
1004 - [`Option::unwrap_unchecked`]
1005 - [`Result::unwrap_unchecked`]
1006 - [`Result::unwrap_err_unchecked`]
1009 These APIs are now usable in const contexts:
1012 - [`Duration::checked_add`]
1013 - [`Duration::saturating_add`]
1014 - [`Duration::checked_sub`]
1015 - [`Duration::saturating_sub`]
1016 - [`Duration::checked_mul`]
1017 - [`Duration::saturating_mul`]
1018 - [`Duration::checked_div`]
1023 - [Add --message-format for install command][cargo/10107]
1024 - [Warn when alias shadows external subcommand][cargo/10082]
1029 - [Show all Deref implementations recursively in rustdoc][90183]
1030 - [Use computed visibility in rustdoc][88447]
1035 - [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.
1036 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1037 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1038 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1039 - [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.
1040 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1045 These changes provide no direct user facing benefits, but represent significant
1046 improvements to the internals and overall performance of rustc
1049 - [Implement coherence checks for negative trait impls][90104]
1050 - [Add rustc lint, warning when iterating over hashmaps][89558]
1051 - [Optimize live point computation][90491]
1052 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1053 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1055 [87337]: https://github.com/rust-lang/rust/pull/87337/
1056 [87467]: https://github.com/rust-lang/rust/pull/87467/
1057 [87704]: https://github.com/rust-lang/rust/pull/87704/
1058 [88041]: https://github.com/rust-lang/rust/pull/88041/
1059 [88447]: https://github.com/rust-lang/rust/pull/88447/
1060 [88601]: https://github.com/rust-lang/rust/pull/88601/
1061 [89062]: https://github.com/rust-lang/rust/pull/89062/
1062 [89174]: https://github.com/rust-lang/rust/pull/89174/
1063 [89551]: https://github.com/rust-lang/rust/pull/89551/
1064 [89558]: https://github.com/rust-lang/rust/pull/89558/
1065 [89580]: https://github.com/rust-lang/rust/pull/89580/
1066 [89652]: https://github.com/rust-lang/rust/pull/89652/
1067 [90041]: https://github.com/rust-lang/rust/pull/90041/
1068 [90058]: https://github.com/rust-lang/rust/pull/90058/
1069 [90104]: https://github.com/rust-lang/rust/pull/90104/
1070 [90117]: https://github.com/rust-lang/rust/pull/90117/
1071 [90175]: https://github.com/rust-lang/rust/pull/90175/
1072 [90183]: https://github.com/rust-lang/rust/pull/90183/
1073 [90297]: https://github.com/rust-lang/rust/pull/90297/
1074 [90329]: https://github.com/rust-lang/rust/pull/90329/
1075 [90361]: https://github.com/rust-lang/rust/pull/90361/
1076 [90417]: https://github.com/rust-lang/rust/pull/90417/
1077 [90473]: https://github.com/rust-lang/rust/pull/90473/
1078 [90491]: https://github.com/rust-lang/rust/pull/90491/
1079 [90733]: https://github.com/rust-lang/rust/pull/90733/
1080 [90833]: https://github.com/rust-lang/rust/pull/90833/
1081 [90846]: https://github.com/rust-lang/rust/pull/90846/
1082 [91026]: https://github.com/rust-lang/rust/pull/91026/
1083 [91207]: https://github.com/rust-lang/rust/pull/91207/
1084 [91255]: https://github.com/rust-lang/rust/pull/91255/
1085 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1086 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1087 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1088 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1089 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1090 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1091 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1092 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1093 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1094 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1096 Version 1.57.0 (2021-12-02)
1097 ==========================
1102 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1103 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1104 - [Allow panicking in constant evaluation.][89508]
1105 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1110 - [Create more accurate debuginfo for vtables.][89597]
1111 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1112 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1113 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1114 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1116 \* Refer to Rust's [platform support page][platform-support-doc] for more
1117 information on Rust's tiered platform support.
1122 - [Avoid allocations and copying in `Vec::leak`][89337]
1123 - [Add `#[repr(i8)]` to `Ordering`][89507]
1124 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1125 - [Update to Unicode 14.0][89614]
1126 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1127 when ignoring their return value. This helps catch mistakes such as expecting
1128 a function to mutate a value in place rather than return a new value.
1133 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1134 - [`[T; N]::as_slice`][`array::as_slice`]
1135 - [`collections::TryReserveError`]
1136 - [`HashMap::try_reserve`]
1137 - [`HashSet::try_reserve`]
1138 - [`String::try_reserve`]
1139 - [`String::try_reserve_exact`]
1140 - [`Vec::try_reserve`]
1141 - [`Vec::try_reserve_exact`]
1142 - [`VecDeque::try_reserve`]
1143 - [`VecDeque::try_reserve_exact`]
1144 - [`Iterator::map_while`]
1145 - [`iter::MapWhile`]
1146 - [`proc_macro::is_available`]
1147 - [`Command::get_program`]
1148 - [`Command::get_args`]
1149 - [`Command::get_envs`]
1150 - [`Command::get_current_dir`]
1154 These APIs are now usable in const contexts:
1156 - [`hint::unreachable_unchecked`]
1161 - [Stabilize custom profiles][cargo/9943]
1166 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1167 This will break some builds that set `#![deny(dead_code)]`.
1171 These changes provide no direct user facing benefits, but represent significant
1172 improvements to the internals and overall performance of rustc
1175 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1177 [85200]: https://github.com/rust-lang/rust/pull/85200/
1178 [86191]: https://github.com/rust-lang/rust/pull/86191/
1179 [87220]: https://github.com/rust-lang/rust/pull/87220/
1180 [87260]: https://github.com/rust-lang/rust/pull/87260/
1181 [88321]: https://github.com/rust-lang/rust/pull/88321/
1182 [88529]: https://github.com/rust-lang/rust/pull/88529/
1183 [88690]: https://github.com/rust-lang/rust/pull/88690/
1184 [88952]: https://github.com/rust-lang/rust/pull/88952/
1185 [89337]: https://github.com/rust-lang/rust/pull/89337/
1186 [89507]: https://github.com/rust-lang/rust/pull/89507/
1187 [89508]: https://github.com/rust-lang/rust/pull/89508/
1188 [89582]: https://github.com/rust-lang/rust/pull/89582/
1189 [89597]: https://github.com/rust-lang/rust/pull/89597/
1190 [89614]: https://github.com/rust-lang/rust/pull/89614/
1191 [89692]: https://github.com/rust-lang/rust/issues/89692/
1192 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1193 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1194 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1195 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1196 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1197 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1198 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1199 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1200 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1201 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1202 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1203 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1204 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1205 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1206 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1207 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1208 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1209 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1210 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1211 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1212 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1214 Version 1.56.1 (2021-11-01)
1215 ===========================
1217 - New lints to detect the presence of bidirectional-override Unicode
1218 codepoints in the compiled source code ([CVE-2021-42574])
1220 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1222 Version 1.56.0 (2021-10-21)
1223 ========================
1228 - [The 2021 Edition is now stable.][rust#88100]
1229 See [the edition guide][rust-2021-edition-guide] for more details.
1230 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1231 - [Union field access is permitted in `const fn`.][rust#85769]
1233 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1238 - [Upgrade to LLVM 13.][rust#87570]
1239 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1240 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1241 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1242 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1243 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1244 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1245 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1247 \* Refer to Rust's [platform support page][platform-support-doc] for more
1248 information on Rust's tiered platform support.
1253 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1254 The Windows console still requires valid Unicode, but this change allows
1255 splitting a UTF-8 character across multiple write calls. This allows, for
1256 instance, programs that just read and write data buffers (e.g. copying a file
1257 to stdout) without regard for Unicode or character boundaries.
1258 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1259 For this use case, atomics scale much better under contention.
1260 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1261 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1262 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1263 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1264 - [Treat invalid environment variable names as non-existent.][rust#86183]
1265 Previously, the environment functions would panic if given a variable name
1266 with an internal null character or equal sign (`=`). Now, these functions will
1267 just treat such names as non-existent variables, since the OS cannot represent
1268 the existence of a variable with such a name.
1273 - [`std::os::unix::fs::chroot`]
1274 - [`UnsafeCell::raw_get`]
1275 - [`BufWriter::into_parts`]
1276 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1277 These APIs were previously stable in `std`, but are now also available in `core`.
1278 - [`Vec::shrink_to`]
1279 - [`String::shrink_to`]
1280 - [`OsString::shrink_to`]
1281 - [`PathBuf::shrink_to`]
1282 - [`BinaryHeap::shrink_to`]
1283 - [`VecDeque::shrink_to`]
1284 - [`HashMap::shrink_to`]
1285 - [`HashSet::shrink_to`]
1287 These APIs are now usable in const contexts:
1289 - [`std::mem::transmute`]
1290 - [`[T]::first`][`slice::first`]
1291 - [`[T]::split_first`][`slice::split_first`]
1292 - [`[T]::last`][`slice::last`]
1293 - [`[T]::split_last`][`slice::split_last`]
1298 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1299 This has no effect at present on dependency version selection.
1300 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1301 that support Rust code to include a crate's specified minimum version in the test matrix for that
1307 - [Update to new argument parsing rules on Windows.][rust#87580]
1308 This adjusts Rust's standard library to match the behavior of the standard
1309 libraries for C/C++. The rules have changed slightly over time, and this PR
1310 brings us to the latest set of rules (changed in 2008).
1311 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1312 This was already not supported by LLVM; this change surfaces this lack of
1313 support with a better error message.
1314 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1315 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1316 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1317 may return different values on glibc <= 2.24.][rust#81825]
1318 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1319 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1320 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1321 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1325 These changes provide no direct user facing benefits, but represent significant
1326 improvements to the internals and overall performance of rustc
1329 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1330 This improves the performance of most Rust builds.
1331 - [Unify representation of macros in internal data structures.][rust#88019]
1332 This change fixes a host of bugs with the handling of macros by the compiler,
1335 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1336 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1337 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1338 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1339 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1340 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1341 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1342 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1343 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1344 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1345 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1346 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1347 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1348 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1349 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1350 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1351 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1352 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1353 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1354 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1355 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1356 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1357 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1358 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1359 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1360 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1361 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1362 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1363 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1364 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1365 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1366 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1367 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1368 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1369 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1370 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1371 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1372 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1373 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1374 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1375 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1376 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1378 Version 1.55.0 (2021-09-09)
1379 ============================
1383 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1384 will end at the maximum value of the integer.][83918]
1385 - [You can now explicitly import the prelude of different editions
1386 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1390 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1392 \* Refer to Rust's [platform support page][platform-support-doc] for more
1393 information on Rust's tiered platform support.
1398 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1399 These improvements should in general provide faster string parsing of floats,
1400 no longer reject certain valid floating point values, and reduce
1401 the produced code size for non-stripped artifacts.
1402 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1409 - [`IntoInnerError::into_error`]
1410 - [`IntoInnerError::into_parts`]
1411 - [`MaybeUninit::assume_init_mut`]
1412 - [`MaybeUninit::assume_init_ref`]
1413 - [`MaybeUninit::write`]
1415 - [`ops::ControlFlow`]
1417 - [`x86::_bittestandcomplement`]
1418 - [`x86::_bittestandreset`]
1419 - [`x86::_bittestandset`]
1420 - [`x86_64::_bittest64`]
1421 - [`x86_64::_bittestandcomplement64`]
1422 - [`x86_64::_bittestandreset64`]
1423 - [`x86_64::_bittestandset64`]
1425 The following previously stable functions are now `const`.
1427 - [`str::from_utf8_unchecked`]
1432 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1433 rustc in parallel such as when using `cargo test`.][cargo/9675]
1434 - [The package definition in `cargo metadata` now includes the `"default_run"`
1435 field from the manifest.][cargo/9550]
1436 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1437 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1438 of packages.][cargo/9663]
1442 - [Added "Go to item on exact match" search option.][85876]
1443 - [The "Implementors" section on traits no longer shows redundant
1444 method definitions.][85970]
1445 - [Trait implementations are toggled open by default.][86260] This should make the
1446 implementations more searchable by tools like `CTRL+F` in your browser.
1447 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1448 through type aliases.][86334]
1449 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1450 "Trait Implementations" section.][86513]
1455 - [std functions that return an `io::Error` will no longer use the
1456 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1457 kinds of errors could be categorised [into newer more specific `ErrorKind`
1458 variants][79965], and that they do not represent a user error.
1459 - [Using environment variable names with `process::Command` on Windows now
1460 behaves as expected.][85270] Previously using envionment variables with
1461 `Command` would cause them to be ASCII-uppercased.
1462 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1463 with `rustdoc::`][86849]
1464 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1465 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1466 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1469 [86849]: https://github.com/rust-lang/rust/pull/86849
1470 [86513]: https://github.com/rust-lang/rust/pull/86513
1471 [86334]: https://github.com/rust-lang/rust/pull/86334
1472 [86260]: https://github.com/rust-lang/rust/pull/86260
1473 [85970]: https://github.com/rust-lang/rust/pull/85970
1474 [85876]: https://github.com/rust-lang/rust/pull/85876
1475 [83572]: https://github.com/rust-lang/rust/pull/83572
1476 [86294]: https://github.com/rust-lang/rust/pull/86294
1477 [86858]: https://github.com/rust-lang/rust/pull/86858
1478 [86761]: https://github.com/rust-lang/rust/pull/86761
1479 [85746]: https://github.com/rust-lang/rust/pull/85746
1480 [85270]: https://github.com/rust-lang/rust/pull/85270
1481 [83918]: https://github.com/rust-lang/rust/pull/83918
1482 [79965]: https://github.com/rust-lang/rust/pull/79965
1483 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1484 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1485 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1486 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1487 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1488 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1489 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1490 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1491 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1492 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1493 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1494 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1495 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1496 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1497 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1498 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1499 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1500 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1501 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1502 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1503 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1504 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1507 Version 1.54.0 (2021-07-29)
1508 ============================
1511 -----------------------
1513 - [You can now use macros for values in some built-in attributes.][83366]
1514 This primarily allows you to call macros within the `#[doc]` attribute. For
1515 example, to include external documentation in your crate, you can now write
1518 #![doc = include_str!("README.md")]
1521 - [You can now cast between unsized slice types (and types which contain
1522 unsized slices) in `const fn`.][85078]
1523 - [You can now use multiple generic lifetimes with `impl Trait` where the
1524 lifetimes don't explicitly outlive another.][84701] In code this means
1525 that you can now have `impl Trait<'a, 'b>` where as before you could
1526 only have `impl Trait<'a, 'b> where 'b: 'a`.
1529 -----------------------
1531 - [Rustc will now search for custom JSON targets in
1532 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1533 directory.][83800] You can find your sysroot directory by running
1534 `rustc --print sysroot`.
1535 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1536 - [You can now use `#[target_feature]` on safe functions when targeting
1537 WebAssembly platforms.][84988]
1538 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1539 - [Added tier 3\* support for `bpfel-unknown-none`
1540 and `bpfeb-unknown-none`.][79608]
1541 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1543 \* Refer to Rust's [platform support page][platform-support-doc] for more
1544 information on Rust's tiered platform support.
1547 -----------------------
1549 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1550 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1551 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1552 - [The implementations of vendor intrinsics in core::arch have been
1553 significantly refactored.][83278] The main user-visible changes are
1554 a 50% reduction in the size of libcore.rlib and stricter validation
1555 of constant operands passed to intrinsics. The latter is technically
1556 a breaking change, but allows Rust to more closely match the C vendor
1562 - [`BTreeMap::into_keys`]
1563 - [`BTreeMap::into_values`]
1564 - [`HashMap::into_keys`]
1565 - [`HashMap::into_values`]
1567 - [`VecDeque::binary_search`]
1568 - [`VecDeque::binary_search_by`]
1569 - [`VecDeque::binary_search_by_key`]
1570 - [`VecDeque::partition_point`]
1575 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1576 the dependency graph.][cargo/9520]
1577 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1578 in the tree ][cargo/9499]
1579 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1580 macro dependencies.][cargo/9488]
1581 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1582 This variable points to a directory that integration tests and benches
1583 can use as a "scratchpad" for testing filesystem operations.
1587 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1588 - [Previously unsound code is no longer permitted where different constructors in branches
1589 could require different lifetimes.][85574]
1590 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1591 than before and may reject some previously accepted code.
1592 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1593 when compiled with `codegen-units = 1`.][86063]
1595 [85574]: https://github.com/rust-lang/rust/issues/85574
1596 [86831]: https://github.com/rust-lang/rust/issues/86831
1597 [86063]: https://github.com/rust-lang/rust/issues/86063
1598 [79608]: https://github.com/rust-lang/rust/pull/79608
1599 [84988]: https://github.com/rust-lang/rust/pull/84988
1600 [84701]: https://github.com/rust-lang/rust/pull/84701
1601 [84072]: https://github.com/rust-lang/rust/pull/84072
1602 [85745]: https://github.com/rust-lang/rust/pull/85745
1603 [84744]: https://github.com/rust-lang/rust/pull/84744
1604 [85078]: https://github.com/rust-lang/rust/pull/85078
1605 [84717]: https://github.com/rust-lang/rust/pull/84717
1606 [83800]: https://github.com/rust-lang/rust/pull/83800
1607 [83366]: https://github.com/rust-lang/rust/pull/83366
1608 [83278]: https://github.com/rust-lang/rust/pull/83278
1609 [85292]: https://github.com/rust-lang/rust/pull/85292
1610 [82834]: https://github.com/rust-lang/rust/pull/82834
1611 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1612 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1613 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1614 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1615 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1616 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1617 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1618 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1619 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1620 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1621 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1623 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1625 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1627 Version 1.53.0 (2021-06-17)
1628 ============================
1631 -----------------------
1632 - [You can now use unicode for identifiers.][83799] This allows multilingual
1633 identifiers but still doesn't allow glyphs that are not considered characters
1634 such as `◆` or `🦀`. More specifically you can now use any identifier that
1635 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1636 is the same standard as languages like Python, however Rust uses NFC
1637 normalization which may be different from other languages.
1638 - [You can now specify "or patterns" inside pattern matches.][79278]
1639 Previously you could only use `|` (OR) on complete patterns. E.g.
1643 matches!(x, Some(1) | Some(2));
1645 matches!(x, Some(1 | 2));
1647 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1648 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1649 to change semantics to being a pattern fragment in a future edition.
1652 -----------------------
1653 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1654 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1655 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1657 \* Refer to Rust's [platform support page][platform-support-doc] for more
1658 information on Rust's tiered platform support.
1661 -----------------------
1662 - [Abort messages will now forward to `android_set_abort_message` on
1663 Android platforms when available.][81469]
1664 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1665 - [Arrays of any length now implement `IntoIterator`.][84147]
1666 Currently calling `.into_iter()` as a method on an array will
1667 return `impl Iterator<Item=&T>`, but this may change in a
1668 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1669 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1670 - [`leading_zeros`, and `trailing_zeros` are now available on all
1671 `NonZero` integer types.][84082]
1672 - [`{f32, f64}::from_str` now parse and print special values
1673 (`NaN`, `-0`) according to IEEE 754.][78618]
1674 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1675 - [Add the `BITS` associated constant to all numeric types.][82565]
1679 - [`AtomicBool::fetch_update`]
1680 - [`AtomicPtr::fetch_update`]
1681 - [`BTreeMap::retain`]
1682 - [`BTreeSet::retain`]
1683 - [`BufReader::seek_relative`]
1684 - [`DebugStruct::non_exhaustive`]
1686 - [`Duration::ZERO`]
1687 - [`Duration::is_zero`]
1688 - [`Duration::saturating_add`]
1689 - [`Duration::saturating_mul`]
1690 - [`Duration::saturating_sub`]
1691 - [`ErrorKind::Unsupported`]
1692 - [`Option::insert`]
1693 - [`Ordering::is_eq`]
1694 - [`Ordering::is_ge`]
1695 - [`Ordering::is_gt`]
1696 - [`Ordering::is_le`]
1697 - [`Ordering::is_lt`]
1698 - [`Ordering::is_ne`]
1699 - [`OsStr::is_ascii`]
1700 - [`OsStr::make_ascii_lowercase`]
1701 - [`OsStr::make_ascii_uppercase`]
1702 - [`OsStr::to_ascii_lowercase`]
1703 - [`OsStr::to_ascii_uppercase`]
1704 - [`Peekable::peek_mut`]
1705 - [`Rc::decrement_strong_count`]
1706 - [`Rc::increment_strong_count`]
1707 - [`Vec::extend_from_within`]
1708 - [`array::from_mut`]
1709 - [`array::from_ref`]
1710 - [`cmp::max_by_key`]
1712 - [`cmp::min_by_key`]
1714 - [`f32::is_subnormal`]
1715 - [`f64::is_subnormal`]
1718 -----------------------
1719 - [Cargo now supports git repositories where the default `HEAD` branch is not
1720 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1721 which can handle default branches correctly.
1722 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1723 - [The `authors` field is no longer included in `Cargo.toml` for new
1724 projects.][cargo/9282]
1727 -----------------------
1728 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1729 without hyperlinks.][81764]
1733 - [Implement token-based handling of attributes during expansion][82608]
1734 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1735 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1736 to confusion and potential security vulnerabilities and [is no
1737 longer recommended][ietf6943].
1738 - [The added `BITS` constant may conflict with external definitions.][85667]
1739 In particular, this was known to be a problem in the `lexical-core` crate,
1740 but they have published fixes for semantic versions 0.4 through 0.7. To
1741 update this dependency alone, use `cargo update -p lexical-core`.
1742 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1746 These changes provide no direct user facing benefits, but represent significant
1747 improvements to the internals and overall performance of rustc and
1750 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1751 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1752 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1753 - [Rework rustdoc const type][82873]
1755 [85667]: https://github.com/rust-lang/rust/pull/85667
1756 [83386]: https://github.com/rust-lang/rust/pull/83386
1757 [82771]: https://github.com/rust-lang/rust/pull/82771
1758 [84147]: https://github.com/rust-lang/rust/pull/84147
1759 [84082]: https://github.com/rust-lang/rust/pull/84082
1760 [83799]: https://github.com/rust-lang/rust/pull/83799
1761 [83681]: https://github.com/rust-lang/rust/pull/83681
1762 [83652]: https://github.com/rust-lang/rust/pull/83652
1763 [83387]: https://github.com/rust-lang/rust/pull/83387
1764 [82873]: https://github.com/rust-lang/rust/pull/82873
1765 [82864]: https://github.com/rust-lang/rust/pull/82864
1766 [82608]: https://github.com/rust-lang/rust/pull/82608
1767 [82565]: https://github.com/rust-lang/rust/pull/82565
1768 [80525]: https://github.com/rust-lang/rust/pull/80525
1769 [79278]: https://github.com/rust-lang/rust/pull/79278
1770 [78618]: https://github.com/rust-lang/rust/pull/78618
1771 [77704]: https://github.com/rust-lang/rust/pull/77704
1772 [83941]: https://github.com/rust-lang/rust/pull/83941
1773 [83065]: https://github.com/rust-lang/rust/pull/83065
1774 [81764]: https://github.com/rust-lang/rust/pull/81764
1775 [81469]: https://github.com/rust-lang/rust/pull/81469
1776 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1777 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1778 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1779 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1780 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1781 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1782 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1783 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1784 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1785 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1786 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1787 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1788 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1789 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1790 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1791 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1792 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1793 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1794 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1795 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1796 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1797 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1798 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1799 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1800 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1801 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1802 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1803 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1804 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1805 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1806 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1807 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1808 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1809 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1810 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1811 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1812 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1813 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1814 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1815 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1816 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1819 Version 1.52.1 (2021-05-10)
1820 ============================
1822 This release disables incremental compilation, unless the user has explicitly
1823 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1825 This is due to the widespread, and frequently occurring, breakage encountered by
1826 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1827 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1828 newly added incremental verification are still present in past stable versions,
1829 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1832 These problems only affect incremental builds, so release builds with Cargo
1833 should not be affected unless the user has explicitly opted into incremental.
1834 Debug and check builds are affected.
1836 See [84970] for more details.
1838 [84970]: https://github.com/rust-lang/rust/issues/84970
1840 Version 1.52.0 (2021-05-06)
1841 ============================
1845 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1846 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1847 is allowed by default, and may become a warning or hard error in a
1849 - [You can now cast mutable references to arrays to a pointer of the same type as
1850 the element.][81479]
1854 - [Upgraded the default LLVM to LLVM 12.][81451]
1856 Added tier 3\* support for the following targets.
1858 - [`s390x-unknown-linux-musl`][82166]
1859 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1860 - [`powerpc-unknown-openbsd`][82733]
1862 \* Refer to Rust's [platform support page][platform-support-doc] for more
1863 information on Rust's tiered platform support.
1867 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1868 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1869 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1870 - [All integer division and remainder operations are now `const`.][80962]
1874 - [`Arguments::as_str`]
1876 - [`char::REPLACEMENT_CHARACTER`]
1877 - [`char::UNICODE_VERSION`]
1878 - [`char::decode_utf16`]
1879 - [`char::from_digit`]
1880 - [`char::from_u32_unchecked`]
1881 - [`char::from_u32`]
1882 - [`slice::partition_point`]
1883 - [`str::rsplit_once`]
1884 - [`str::split_once`]
1886 The following previously stable APIs are now `const`.
1888 - [`char::len_utf8`]
1889 - [`char::len_utf16`]
1890 - [`char::to_ascii_uppercase`]
1891 - [`char::to_ascii_lowercase`]
1892 - [`char::eq_ignore_ascii_case`]
1893 - [`u8::to_ascii_uppercase`]
1894 - [`u8::to_ascii_lowercase`]
1895 - [`u8::eq_ignore_ascii_case`]
1899 - [Rustdoc lints are now treated as a tool lint, meaning that
1900 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1901 Using the old style is still allowed, and will become a warning in
1903 - [Rustdoc now supports argument files.][82261]
1904 - [Rustdoc now generates smart punctuation for documentation.][79423]
1905 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1913 - [You can now pass multiple filters to tests.][81356] E.g.
1914 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1915 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1916 allowing you to see `std` symbols when debugging.][82218]
1920 These changes provide no direct user facing benefits, but represent significant
1921 improvements to the internals and overall performance of rustc and
1924 - [Check the result cache before the DepGraph when ensuring queries][81855]
1925 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1926 - [Only store a LocalDefId in some HIR nodes][81611]
1927 - [Store HIR attributes in a side table][79519]
1931 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1932 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1933 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1934 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1935 languages in code blocks.][78429]
1936 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1937 - [Changes in how proc macros handle whitespace may lead to panics when used
1938 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1939 - [Turn `#[derive]` into a regular macro attribute][79078]
1941 [84136]: https://github.com/rust-lang/rust/issues/84136
1942 [80763]: https://github.com/rust-lang/rust/pull/80763
1943 [82166]: https://github.com/rust-lang/rust/pull/82166
1944 [82121]: https://github.com/rust-lang/rust/pull/82121
1945 [81879]: https://github.com/rust-lang/rust/pull/81879
1946 [82261]: https://github.com/rust-lang/rust/pull/82261
1947 [82218]: https://github.com/rust-lang/rust/pull/82218
1948 [82216]: https://github.com/rust-lang/rust/pull/82216
1949 [82202]: https://github.com/rust-lang/rust/pull/82202
1950 [81855]: https://github.com/rust-lang/rust/pull/81855
1951 [81766]: https://github.com/rust-lang/rust/pull/81766
1952 [81744]: https://github.com/rust-lang/rust/pull/81744
1953 [81611]: https://github.com/rust-lang/rust/pull/81611
1954 [81479]: https://github.com/rust-lang/rust/pull/81479
1955 [81451]: https://github.com/rust-lang/rust/pull/81451
1956 [81356]: https://github.com/rust-lang/rust/pull/81356
1957 [80962]: https://github.com/rust-lang/rust/pull/80962
1958 [80553]: https://github.com/rust-lang/rust/pull/80553
1959 [80527]: https://github.com/rust-lang/rust/pull/80527
1960 [79519]: https://github.com/rust-lang/rust/pull/79519
1961 [79423]: https://github.com/rust-lang/rust/pull/79423
1962 [79208]: https://github.com/rust-lang/rust/pull/79208
1963 [78429]: https://github.com/rust-lang/rust/pull/78429
1964 [82733]: https://github.com/rust-lang/rust/pull/82733
1965 [82594]: https://github.com/rust-lang/rust/pull/82594
1966 [79078]: https://github.com/rust-lang/rust/pull/79078
1967 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1968 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1969 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1970 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1971 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1972 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1973 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1974 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1975 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1976 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1977 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1978 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1979 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1980 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1981 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1982 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1983 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1984 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1985 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1986 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1987 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1988 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1990 Version 1.51.0 (2021-03-25)
1991 ============================
1995 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1996 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1997 E.g. you can now write the following. Note: Only values of primitive integers,
1998 `bool`, or `char` types are currently permitted.
2000 struct GenericArray<T, const LENGTH: usize> {
2004 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2005 const fn last(&self) -> Option<&T> {
2009 Some(&self.inner[LENGTH - 1])
2019 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2020 This option controls whether debug information is split across multiple files
2021 or packed into a single file. **Note** This option is unstable on other platforms.
2022 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2023 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2024 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2025 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2027 \* Refer to Rust's [platform support page][platform-support-doc] for more
2028 information on Rust's tiered platform support.
2033 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2034 - [`str` now implements `AsMut<str>`.][80279]
2035 - [`u64` and `u128` now implement `From<char>`.][79502]
2036 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2037 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2038 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2039 - [`io::Empty` now implements `io::Seek`.][78044]
2040 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2041 `T: ?Sized` types.][80764]
2042 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2048 - [`Arc::decrement_strong_count`]
2049 - [`Arc::increment_strong_count`]
2050 - [`Once::call_once_force`]
2051 - [`Peekable::next_if_eq`]
2052 - [`Peekable::next_if`]
2053 - [`Seek::stream_position`]
2054 - [`array::IntoIter`]
2055 - [`panic::panic_any`]
2057 - [`ptr::addr_of_mut!`]
2058 - [`slice::fill_with`]
2059 - [`slice::split_inclusive_mut`]
2060 - [`slice::split_inclusive`]
2061 - [`slice::strip_prefix`]
2062 - [`slice::strip_suffix`]
2063 - [`str::split_inclusive`]
2064 - [`sync::OnceState`]
2066 - [`VecDeque::range`]
2067 - [`VecDeque::range_mut`]
2071 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2072 codegen option.][cargo/9112]
2073 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2074 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2075 to avoid unifying features of dependencies where that unification could be unwanted.
2076 Such as using the same dependency with a `std` feature in a build scripts and
2077 proc-macros, while using the `no-std` feature in the final binary. See the
2078 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2083 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2084 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2085 documentation.][79642]
2087 Various improvements to intra-doc links:
2089 - [You can link to non-path primitives such as `slice`.][80181]
2090 - [You can link to associated items.][74489]
2091 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2095 - [You can now pass `--include-ignored` to tests (e.g. with
2096 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2101 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2102 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2104 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2105 for the distributed artifacts.][81521]
2106 - `armv5te-unknown-linux-gnueabi`
2107 - `sparc64-unknown-linux-gnu`
2108 - `thumbv7neon-unknown-linux-gnueabihf`
2109 - `armv7-unknown-linux-gnueabi`
2110 - `x86_64-unknown-linux-gnux32`
2111 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2116 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2118 [79135]: https://github.com/rust-lang/rust/pull/79135
2119 [74489]: https://github.com/rust-lang/rust/pull/74489
2120 [76934]: https://github.com/rust-lang/rust/pull/76934
2121 [79570]: https://github.com/rust-lang/rust/pull/79570
2122 [80181]: https://github.com/rust-lang/rust/pull/80181
2123 [79642]: https://github.com/rust-lang/rust/pull/79642
2124 [80945]: https://github.com/rust-lang/rust/pull/80945
2125 [80279]: https://github.com/rust-lang/rust/pull/80279
2126 [80053]: https://github.com/rust-lang/rust/pull/80053
2127 [79502]: https://github.com/rust-lang/rust/pull/79502
2128 [75180]: https://github.com/rust-lang/rust/pull/75180
2129 [81521]: https://github.com/rust-lang/rust/pull/81521
2130 [80968]: https://github.com/rust-lang/rust/pull/80968
2131 [80959]: https://github.com/rust-lang/rust/pull/80959
2132 [80718]: https://github.com/rust-lang/rust/pull/80718
2133 [80653]: https://github.com/rust-lang/rust/pull/80653
2134 [80579]: https://github.com/rust-lang/rust/pull/80579
2135 [79998]: https://github.com/rust-lang/rust/pull/79998
2136 [78044]: https://github.com/rust-lang/rust/pull/78044
2137 [81455]: https://github.com/rust-lang/rust/pull/81455
2138 [80764]: https://github.com/rust-lang/rust/pull/80764
2139 [80749]: https://github.com/rust-lang/rust/pull/80749
2140 [80662]: https://github.com/rust-lang/rust/pull/80662
2141 [79134]: https://github.com/rust-lang/rust/pull/79134
2142 [80966]: https://github.com/rust-lang/rust/pull/80966
2143 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2144 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2145 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2146 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2147 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2148 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2149 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2150 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2151 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2152 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2153 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2154 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2155 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2156 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2157 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2158 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2159 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2160 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2161 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2162 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2163 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2164 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2165 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2167 Version 1.50.0 (2021-02-11)
2168 ============================
2171 -----------------------
2172 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2173 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2174 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2177 -----------------------
2178 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2179 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2180 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2181 - [Dropped support for all cloudabi targets.][78439]
2183 \* Refer to Rust's [platform support page][platform-support-doc] for more
2184 information on Rust's tiered platform support.
2187 -----------------------
2189 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2190 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2191 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2192 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2193 up the same amount of space as `File`.
2199 - [`btree_map::Entry::or_insert_with_key`]
2202 - [`hash_map::Entry::or_insert_with_key`]
2206 - [`UnsafeCell::get_mut`]
2208 The following previously stable methods are now `const`.
2210 - [`IpAddr::is_ipv4`]
2211 - [`IpAddr::is_ipv6`]
2212 - [`IpAddr::is_unspecified`]
2213 - [`IpAddr::is_loopback`]
2214 - [`IpAddr::is_multicast`]
2215 - [`Ipv4Addr::octets`]
2216 - [`Ipv4Addr::is_loopback`]
2217 - [`Ipv4Addr::is_private`]
2218 - [`Ipv4Addr::is_link_local`]
2219 - [`Ipv4Addr::is_multicast`]
2220 - [`Ipv4Addr::is_broadcast`]
2221 - [`Ipv4Addr::is_documentation`]
2222 - [`Ipv4Addr::to_ipv6_compatible`]
2223 - [`Ipv4Addr::to_ipv6_mapped`]
2224 - [`Ipv6Addr::segments`]
2225 - [`Ipv6Addr::is_unspecified`]
2226 - [`Ipv6Addr::is_loopback`]
2227 - [`Ipv6Addr::is_multicast`]
2228 - [`Ipv6Addr::to_ipv4`]
2231 - [`Layout::from_size_align`]
2232 - `pow` for all integer types.
2233 - `checked_pow` for all integer types.
2234 - `saturating_pow` for all integer types.
2235 - `wrapping_pow` for all integer types.
2236 - `next_power_of_two` for all unsigned integer types.
2237 - `checked_next_power_of_two` for all unsigned integer types.
2240 -----------------------
2242 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2243 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2244 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2245 contents of that directory for changes.][cargo/8973]
2246 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2251 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2252 - [Running tests will now print the total time taken to execute.][75752]
2257 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2258 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2259 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2260 unhygenic `macro_rules!` macros.][79472]
2261 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2262 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2263 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2264 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2265 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2266 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2268 [74989]: https://github.com/rust-lang/rust/pull/74989
2269 [79261]: https://github.com/rust-lang/rust/pull/79261
2270 [79896]: https://github.com/rust-lang/rust/pull/79896
2271 [79484]: https://github.com/rust-lang/rust/pull/79484
2272 [79472]: https://github.com/rust-lang/rust/pull/79472
2273 [79270]: https://github.com/rust-lang/rust/pull/79270
2274 [79003]: https://github.com/rust-lang/rust/pull/79003
2275 [78864]: https://github.com/rust-lang/rust/pull/78864
2276 [78636]: https://github.com/rust-lang/rust/pull/78636
2277 [78439]: https://github.com/rust-lang/rust/pull/78439
2278 [78343]: https://github.com/rust-lang/rust/pull/78343
2279 [78296]: https://github.com/rust-lang/rust/pull/78296
2280 [78068]: https://github.com/rust-lang/rust/pull/78068
2281 [75752]: https://github.com/rust-lang/rust/pull/75752
2282 [74699]: https://github.com/rust-lang/rust/pull/74699
2283 [78142]: https://github.com/rust-lang/rust/pull/78142
2284 [77484]: https://github.com/rust-lang/rust/pull/77484
2285 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2286 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2287 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2288 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2289 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2290 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2291 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2292 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2293 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2294 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2295 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2296 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2297 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2298 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2299 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2300 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2301 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2302 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2303 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2304 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2305 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2306 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2307 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2308 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2309 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2310 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2311 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2312 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2313 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2314 [`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
2315 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2316 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2317 [`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
2318 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2321 Version 1.49.0 (2020-12-31)
2322 ============================
2325 -----------------------
2327 - [Unions can now implement `Drop`, and you can now have a field in a union
2328 with `ManuallyDrop<T>`.][77547]
2329 - [You can now cast uninhabited enums to integers.][76199]
2330 - [You can now bind by reference and by move in patterns.][76119] This
2331 allows you to selectively borrow individual components of a type. E.g.
2339 let person = Person {
2340 name: String::from("Alice"),
2344 // `name` is moved out of person, but `age` is referenced.
2345 let Person { name, ref age } = person;
2346 println!("{} {}", name, age);
2350 -----------------------
2352 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2353 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2354 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2355 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2356 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2357 - [Output from threads spawned in tests is now captured.][78227]
2358 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2360 \* Refer to Rust's [platform support page][platform-support-doc] for more
2361 information on Rust's tiered platform support.
2364 -----------------------
2366 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2367 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2372 - [`slice::select_nth_unstable`]
2373 - [`slice::select_nth_unstable_by`]
2374 - [`slice::select_nth_unstable_by_key`]
2376 The following previously stable methods are now `const`.
2378 - [`Poll::is_ready`]
2379 - [`Poll::is_pending`]
2382 -----------------------
2383 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2384 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2385 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2386 variable will be set if the crate being built is one the user selected to build, either
2387 with `-p` or through defaults.
2388 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2394 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2395 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2396 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2397 Previously such invalid or unused attributes could be ignored.
2398 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2399 read [this post about the changes][rustdoc-ws-post] for more details.
2400 - [Trait bounds are no longer inferred for associated types.][79904]
2404 These changes provide no direct user facing benefits, but represent significant
2405 improvements to the internals and overall performance of rustc and
2408 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2409 Local Storage model.][78201]
2410 - [Calculate visibilities once in resolve.][78077]
2411 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2412 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2415 [75991]: https://github.com/rust-lang/rust/pull/75991
2416 [78951]: https://github.com/rust-lang/rust/pull/78951
2417 [78848]: https://github.com/rust-lang/rust/pull/78848
2418 [78746]: https://github.com/rust-lang/rust/pull/78746
2419 [78376]: https://github.com/rust-lang/rust/pull/78376
2420 [78228]: https://github.com/rust-lang/rust/pull/78228
2421 [78227]: https://github.com/rust-lang/rust/pull/78227
2422 [78201]: https://github.com/rust-lang/rust/pull/78201
2423 [78109]: https://github.com/rust-lang/rust/pull/78109
2424 [78077]: https://github.com/rust-lang/rust/pull/78077
2425 [77997]: https://github.com/rust-lang/rust/pull/77997
2426 [77703]: https://github.com/rust-lang/rust/pull/77703
2427 [77547]: https://github.com/rust-lang/rust/pull/77547
2428 [77015]: https://github.com/rust-lang/rust/pull/77015
2429 [76199]: https://github.com/rust-lang/rust/pull/76199
2430 [76119]: https://github.com/rust-lang/rust/pull/76119
2431 [75914]: https://github.com/rust-lang/rust/pull/75914
2432 [79004]: https://github.com/rust-lang/rust/pull/79004
2433 [78676]: https://github.com/rust-lang/rust/pull/78676
2434 [79904]: https://github.com/rust-lang/rust/issues/79904
2435 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2436 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2437 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2438 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2439 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2440 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2441 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2442 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2443 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2444 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2446 Version 1.48.0 (2020-11-19)
2447 ==========================
2452 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2453 is still rejected *semantically*, but can now be parsed by procedural macros.
2457 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2458 `rustc` whether to link its own C runtime and libraries or to rely on a external
2459 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2460 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2461 Note: If you're using cargo you must explicitly pass the `--target` flag.
2462 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2464 \* Refer to Rust's [platform support page][platform-support-doc] for more
2465 information on Rust's tiered platform support.
2469 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2470 and `&Stderr`.][76275]
2471 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2472 - [The `matches!` macro now supports having a trailing comma.][74880]
2473 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2474 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2478 - [`slice::as_ptr_range`]
2479 - [`slice::as_mut_ptr_range`]
2480 - [`VecDeque::make_contiguous`]
2481 - [`future::pending`]
2484 The following previously stable methods are now `const fn`'s:
2486 - [`Option::is_some`]
2487 - [`Option::is_none`]
2488 - [`Option::as_ref`]
2490 - [`Result::is_err`]
2491 - [`Result::as_ref`]
2492 - [`Ordering::reverse`]
2493 - [`Ordering::then`]
2500 - [You can now link to items in `rustdoc` using the intra-doc link
2501 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2502 a link to `std::future`'s documentation. See ["Linking to items by
2503 name"][intradoc-links] for more information.
2504 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2505 when searching through `rustdoc`'s UI.][75740]
2509 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2510 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2511 promoted to `'static` lifetime any more inside `const fn`s.
2512 - [Associated type bindings on trait objects are now verified to meet the bounds
2513 declared on the trait when checking that they implement the trait.][27675]
2514 - [When trait bounds on associated types or opaque types are ambiguous, the
2515 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2516 - [Fixed recursive nonterminals not being expanded in macros during
2517 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2518 correctly handling recursive nonterminal tokens.
2519 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2520 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2521 in places where they have no effect.][73461]
2522 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2523 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2524 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2525 disallow zero-initialization.][71274]
2526 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2527 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2528 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2529 see the [`catch_unwind`] documentation for further information.
2535 These changes provide no direct user facing benefits, but represent significant
2536 improvements to the internals and overall performance of rustc and
2539 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2540 You can continue building with `make` by setting `ninja=false` in
2542 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2543 - [Made `ensure_sufficient_stack()` non-generic][76680]
2545 [78143]: https://github.com/rust-lang/rust/issues/78143
2546 [76680]: https://github.com/rust-lang/rust/pull/76680/
2547 [76030]: https://github.com/rust-lang/rust/pull/76030/
2548 [70212]: https://github.com/rust-lang/rust/pull/70212/
2549 [27675]: https://github.com/rust-lang/rust/issues/27675/
2550 [54121]: https://github.com/rust-lang/rust/issues/54121/
2551 [71274]: https://github.com/rust-lang/rust/pull/71274/
2552 [77386]: https://github.com/rust-lang/rust/pull/77386/
2553 [77153]: https://github.com/rust-lang/rust/pull/77153/
2554 [77055]: https://github.com/rust-lang/rust/pull/77055/
2555 [76275]: https://github.com/rust-lang/rust/pull/76275/
2556 [76310]: https://github.com/rust-lang/rust/pull/76310/
2557 [76420]: https://github.com/rust-lang/rust/pull/76420/
2558 [76158]: https://github.com/rust-lang/rust/pull/76158/
2559 [75857]: https://github.com/rust-lang/rust/pull/75857/
2560 [75585]: https://github.com/rust-lang/rust/pull/75585/
2561 [75740]: https://github.com/rust-lang/rust/pull/75740/
2562 [75502]: https://github.com/rust-lang/rust/pull/75502/
2563 [74880]: https://github.com/rust-lang/rust/pull/74880/
2564 [74922]: https://github.com/rust-lang/rust/pull/74922/
2565 [74430]: https://github.com/rust-lang/rust/pull/74430/
2566 [74194]: https://github.com/rust-lang/rust/pull/74194/
2567 [73461]: https://github.com/rust-lang/rust/pull/73461/
2568 [73166]: https://github.com/rust-lang/rust/pull/73166/
2569 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2570 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2571 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2572 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2573 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2574 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2575 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2576 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2577 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2578 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2579 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2580 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2581 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2582 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2583 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2586 Version 1.47.0 (2020-10-08)
2587 ==========================
2591 - [Closures will now warn when not used.][74869]
2595 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2596 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2598 - [Upgraded to LLVM 11.][73526]
2599 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2600 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2601 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2603 \* Refer to Rust's [platform support page][platform-support-doc] for more
2604 information on Rust's tiered platform support.
2608 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2609 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2610 those of length less than 33.][74060]
2611 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2612 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2613 `PartialEq`, and `PartialOrd`.][73583]
2617 - [`Ident::new_raw`]
2618 - [`Range::is_empty`]
2619 - [`RangeInclusive::is_empty`]
2620 - [`Result::as_deref`]
2621 - [`Result::as_deref_mut`]
2623 - [`pointer::offset_from`]
2627 The following previously stable APIs have now been made const.
2629 - [The `new` method for all `NonZero` integers.][73858]
2630 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2631 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2632 methods for all integers.][73858]
2633 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2634 signed integers.][73858]
2635 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2636 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2637 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2638 `is_ascii_control` methods for `char` and `u8`.][73858]
2642 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2643 You can override this by setting the following in your `Cargo.toml`.
2645 [profile.release.build-override]
2648 - [`cargo-help` will now display man pages for commands rather just the
2649 `--help` text.][cargo/8456]
2650 - [`cargo-metadata` now emits a `test` field indicating if a target has
2651 tests enabled.][cargo/8478]
2652 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2653 - [`cargo-publish` will now use an alternative registry by default if it's the
2654 only registry specified in `package.publish`.][cargo/8571]
2658 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2659 type based search.][75366]
2660 - [Added the Ayu theme to rustdoc.][71237]
2664 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2665 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2666 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2667 help to preserve more span information.][73084] These changes may cause
2668 compilation errors if your macro was unhygenic or didn't correctly handle
2670 - [Moved support for the CloudABI target to tier 3.][75568]
2671 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2672 - [Added the `rustc-docs` component.][75560] This allows you to install
2673 and read the documentation for the compiler internal APIs. (Currently only
2674 available for `x86_64-unknown-linux-gnu`.)
2679 - [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.
2681 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2682 [75048]: https://github.com/rust-lang/rust/pull/75048/
2683 [74163]: https://github.com/rust-lang/rust/pull/74163/
2684 [71237]: https://github.com/rust-lang/rust/pull/71237/
2685 [74869]: https://github.com/rust-lang/rust/pull/74869/
2686 [73858]: https://github.com/rust-lang/rust/pull/73858/
2687 [75716]: https://github.com/rust-lang/rust/pull/75716/
2688 [75560]: https://github.com/rust-lang/rust/pull/75560/
2689 [75568]: https://github.com/rust-lang/rust/pull/75568/
2690 [75366]: https://github.com/rust-lang/rust/pull/75366/
2691 [75204]: https://github.com/rust-lang/rust/pull/75204/
2692 [74650]: https://github.com/rust-lang/rust/pull/74650/
2693 [74419]: https://github.com/rust-lang/rust/pull/74419/
2694 [73964]: https://github.com/rust-lang/rust/pull/73964/
2695 [74021]: https://github.com/rust-lang/rust/pull/74021/
2696 [74060]: https://github.com/rust-lang/rust/pull/74060/
2697 [73893]: https://github.com/rust-lang/rust/pull/73893/
2698 [73526]: https://github.com/rust-lang/rust/pull/73526/
2699 [73583]: https://github.com/rust-lang/rust/pull/73583/
2700 [73084]: https://github.com/rust-lang/rust/pull/73084/
2701 [73197]: https://github.com/rust-lang/rust/pull/73197/
2702 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2703 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2704 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2705 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2706 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2707 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2708 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2709 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2710 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2711 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2712 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2713 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2714 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2715 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2718 Version 1.46.0 (2020-08-27)
2719 ==========================
2723 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2724 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2725 const functions.][73862]
2726 - [The `#[track_caller]` attribute can now be added to functions to use the
2727 function's caller's location information for panic messages.][72445]
2728 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2729 `x.0.0` over `(x.0).0`.
2730 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2731 You currently can't use `mem::transmute` in constant functions.
2735 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2736 - [Enabled static "Position Independent Executables" by default
2737 for `x86_64-unknown-linux-musl`.][70740]
2741 - [`mem::forget` is now a `const fn`.][73887]
2742 - [`String` now implements `From<char>`.][73466]
2743 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2744 integer types.][73032]
2745 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2746 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2747 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2748 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2749 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2750 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2755 - [`vec::Drain::as_slice`]
2759 Added a number of new environment variables that are now available when
2760 compiling your crate.
2762 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2763 the specific binary being compiled and the name of the crate.
2764 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2765 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2769 - [The target configuration option `abi_blacklist` has been renamed
2770 to `unsupported_abis`.][74150] The old name will still continue to work.
2771 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2772 This was previously accepted but will become a hard error in a future release.
2773 - [Rustc will fail to compile if you have a struct with
2774 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2776 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2777 ensure that spans have the correct information, and may cause breakage if you
2778 were relying on receiving spans with dummy information.
2779 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2780 a legacy installer that was replaced by a MSI installer a few years ago but
2781 was still being built.
2782 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2783 - [Rustc will no longer accept overlapping trait implementations that only
2784 differ in how the lifetime was bound.][72493]
2785 - [Rustc now correctly relates the lifetime of an existential associated
2786 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2787 you to pass a shorter lifetime than expected.
2788 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2789 The library will need to be installed for `rustc` to work, even though we
2790 expect it to be already available on most systems.
2791 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2793 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2794 exact output returned by rustc's pretty printing is an unstable
2795 implementation detail: we recommend any macro relying on it to switch to a
2796 more robust parsing system.
2798 [75453]: https://github.com/rust-lang/rust/issues/75453/
2799 [74820]: https://github.com/rust-lang/rust/issues/74820/
2800 [74420]: https://github.com/rust-lang/rust/issues/74420/
2801 [74109]: https://github.com/rust-lang/rust/pull/74109/
2802 [74150]: https://github.com/rust-lang/rust/pull/74150/
2803 [73862]: https://github.com/rust-lang/rust/pull/73862/
2804 [73887]: https://github.com/rust-lang/rust/pull/73887/
2805 [73466]: https://github.com/rust-lang/rust/pull/73466/
2806 [73516]: https://github.com/rust-lang/rust/pull/73516/
2807 [73293]: https://github.com/rust-lang/rust/pull/73293/
2808 [73007]: https://github.com/rust-lang/rust/pull/73007/
2809 [73032]: https://github.com/rust-lang/rust/pull/73032/
2810 [72920]: https://github.com/rust-lang/rust/pull/72920/
2811 [72569]: https://github.com/rust-lang/rust/pull/72569/
2812 [72583]: https://github.com/rust-lang/rust/pull/72583/
2813 [72584]: https://github.com/rust-lang/rust/pull/72584/
2814 [72717]: https://github.com/rust-lang/rust/pull/72717/
2815 [72437]: https://github.com/rust-lang/rust/pull/72437/
2816 [72445]: https://github.com/rust-lang/rust/pull/72445/
2817 [72486]: https://github.com/rust-lang/rust/pull/72486/
2818 [72493]: https://github.com/rust-lang/rust/pull/72493/
2819 [72331]: https://github.com/rust-lang/rust/pull/72331/
2820 [71896]: https://github.com/rust-lang/rust/pull/71896/
2821 [71660]: https://github.com/rust-lang/rust/pull/71660/
2822 [71322]: https://github.com/rust-lang/rust/pull/71322/
2823 [70740]: https://github.com/rust-lang/rust/pull/70740/
2824 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2825 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2826 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2827 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2828 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2831 Version 1.45.2 (2020-08-03)
2832 ==========================
2834 * [Fix bindings in tuple struct patterns][74954]
2835 * [Fix track_caller integration with trait objects][74784]
2837 [74954]: https://github.com/rust-lang/rust/issues/74954
2838 [74784]: https://github.com/rust-lang/rust/issues/74784
2841 Version 1.45.1 (2020-07-30)
2842 ==========================
2844 * [Fix const propagation with references.][73613]
2845 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2846 * [Avoid spurious implicit region bound.][74509]
2847 * [Install clippy on x.py install][74457]
2849 [73613]: https://github.com/rust-lang/rust/pull/73613
2850 [73078]: https://github.com/rust-lang/rust/issues/73078
2851 [74509]: https://github.com/rust-lang/rust/pull/74509
2852 [74457]: https://github.com/rust-lang/rust/pull/74457
2855 Version 1.45.0 (2020-07-16)
2856 ==========================
2860 - [Out of range float to int conversions using `as` has been defined as a saturating
2861 conversion.][71269] This was previously undefined behaviour, but you can use the
2862 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2863 may be desirable in rare performance sensitive situations.
2864 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2865 using `u64`.][70705]
2866 - [Function like procedural macros can now be used in expression, pattern, and statement
2867 positions.][68717] This means you can now use a function-like procedural macro
2868 anywhere you can use a declarative (`macro_rules!`) macro.
2872 - [You can now override individual target features through the `target-feature`
2873 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2874 equivalent to `-C target-feature=+avx2,+fma`.
2875 - [Added the `force-unwind-tables` flag.][69984] This option allows
2876 rustc to always generate unwind tables regardless of panic strategy.
2877 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2878 to include LLVM bitcode into generated `rlib`s (this is on by default).
2879 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2880 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2881 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2882 - [Upgraded to LLVM 10.][67759]
2884 \* Refer to Rust's [platform support page][platform-support-doc] for more
2885 information on Rust's tiered platform support.
2890 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2892 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2893 - [You can now use `char` with
2894 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2895 a range of codepoints.][72413] E.g.
2896 you can now write the following;
2898 for ch in 'a'..='z' {
2902 // Prints "abcdefghijklmnopqrstuvwxyz"
2904 - [`OsString` now implements `FromStr`.][71662]
2905 - [The `saturating_neg` method has been added to all signed integer primitive
2906 types, and the `saturating_abs` method has been added for all integer
2907 primitive types.][71886]
2908 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2909 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2911 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2912 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2913 integer types.][69813]
2914 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2915 integer types.][72324]
2916 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2921 - [`BTreeMap::remove_entry`]
2923 - [`rc::Weak::as_ptr`]
2924 - [`rc::Weak::from_raw`]
2925 - [`rc::Weak::into_raw`]
2926 - [`str::strip_prefix`]
2927 - [`str::strip_suffix`]
2928 - [`sync::Weak::as_ptr`]
2929 - [`sync::Weak::from_raw`]
2930 - [`sync::Weak::into_raw`]
2931 - [`char::UNICODE_VERSION`]
2932 - [`Span::resolved_at`]
2933 - [`Span::located_at`]
2934 - [`Span::mixed_site`]
2935 - [`unix::process::CommandExt::arg0`]
2940 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2945 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2946 `~~outdated information~~` becomes "~~outdated information~~".
2947 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2951 - [Trying to self initialize a static value (that is creating a value using
2952 itself) is unsound and now causes a compile error.][71140]
2953 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2954 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2955 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2956 previously undocumented and not intended for public use. Rustdoc still provides
2957 a non-zero exit code on errors.
2958 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2959 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2960 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2961 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2962 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2966 - [Make clippy a git subtree instead of a git submodule][70655]
2967 - [Unify the undo log of all snapshot types][69464]
2969 [71848]: https://github.com/rust-lang/rust/issues/71848/
2970 [73420]: https://github.com/rust-lang/rust/issues/73420/
2971 [72324]: https://github.com/rust-lang/rust/pull/72324/
2972 [71843]: https://github.com/rust-lang/rust/pull/71843/
2973 [71886]: https://github.com/rust-lang/rust/pull/71886/
2974 [72234]: https://github.com/rust-lang/rust/pull/72234/
2975 [72239]: https://github.com/rust-lang/rust/pull/72239/
2976 [72397]: https://github.com/rust-lang/rust/pull/72397/
2977 [72413]: https://github.com/rust-lang/rust/pull/72413/
2978 [72014]: https://github.com/rust-lang/rust/pull/72014/
2979 [72062]: https://github.com/rust-lang/rust/pull/72062/
2980 [72094]: https://github.com/rust-lang/rust/pull/72094/
2981 [72133]: https://github.com/rust-lang/rust/pull/72133/
2982 [67759]: https://github.com/rust-lang/rust/pull/67759/
2983 [71900]: https://github.com/rust-lang/rust/pull/71900/
2984 [71928]: https://github.com/rust-lang/rust/pull/71928/
2985 [71662]: https://github.com/rust-lang/rust/pull/71662/
2986 [71716]: https://github.com/rust-lang/rust/pull/71716/
2987 [71447]: https://github.com/rust-lang/rust/pull/71447/
2988 [71269]: https://github.com/rust-lang/rust/pull/71269/
2989 [71095]: https://github.com/rust-lang/rust/pull/71095/
2990 [71140]: https://github.com/rust-lang/rust/pull/71140/
2991 [70655]: https://github.com/rust-lang/rust/pull/70655/
2992 [70705]: https://github.com/rust-lang/rust/pull/70705/
2993 [69984]: https://github.com/rust-lang/rust/pull/69984/
2994 [69813]: https://github.com/rust-lang/rust/pull/69813/
2995 [69464]: https://github.com/rust-lang/rust/pull/69464/
2996 [68717]: https://github.com/rust-lang/rust/pull/68717/
2997 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2998 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2999 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
3000 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
3001 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3002 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3003 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3004 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3005 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3006 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3007 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3008 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3009 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3010 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3011 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3012 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3013 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3016 Version 1.44.1 (2020-06-18)
3017 ===========================
3019 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3020 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3021 * [Fix crashes when finding backtrace on macOS.][71397]
3022 * [Clippy applies lint levels into different files.][clippy/5356]
3024 [71397]: https://github.com/rust-lang/rust/issues/71397
3025 [73078]: https://github.com/rust-lang/rust/issues/73078
3026 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3027 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3030 Version 1.44.0 (2020-06-04)
3031 ==========================
3035 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3036 - [Added the `unused_braces` lint.][70081]
3038 **Syntax-only changes**
3040 - [Expansion-driven outline module parsing][69838]
3045 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3050 These are still rejected semantically, so you will likely receive an error but
3051 these changes can be seen and parsed by macros and conditional compilation.
3055 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3056 Additionally when in incremental mode rustc defaults to 256 codegen units.
3057 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3058 a panic is thrown.][67502]
3059 - [Added tier 3\* support for the `aarch64-unknown-none` and
3060 `aarch64-unknown-none-softfloat` targets.][68334]
3061 - [Added tier 3 support for `arm64-apple-tvos` and
3062 `x86_64-apple-tvos` targets.][68191]
3067 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3068 `vec![]` to be able to be used in `const` contexts.
3069 - [`convert::Infallible` now implements `Hash`.][70281]
3070 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3071 a `&mut OsStr`.][70048]
3072 - [Unicode 13 is now supported.][69929]
3073 - [`String` now implements `From<&mut str>`.][69661]
3074 - [`IoSlice` now implements `Copy`.][69403]
3075 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3076 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3077 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3078 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3079 integer types.][69373]
3083 - [`PathBuf::with_capacity`]
3084 - [`PathBuf::capacity`]
3085 - [`PathBuf::clear`]
3086 - [`PathBuf::reserve`]
3087 - [`PathBuf::reserve_exact`]
3088 - [`PathBuf::shrink_to_fit`]
3089 - [`f32::to_int_unchecked`]
3090 - [`f64::to_int_unchecked`]
3091 - [`Layout::align_to`]
3092 - [`Layout::pad_to_align`]
3094 - [`Layout::extend`]
3098 - [Added the `cargo tree` command which will print a tree graph of
3099 your dependencies.][cargo/8062] E.g.
3101 mdbook v0.3.2 (/Users/src/rust/mdbook)
3103 │ ├── html5ever v0.24.0
3105 │ │ │ └── cfg-if v0.1.9
3107 │ │ └── markup5ever v0.9.0
3108 │ │ ├── log v0.4.8 (*)
3110 │ │ │ └── phf_shared v0.7.24
3111 │ │ │ ├── siphasher v0.2.3
3112 │ │ │ └── unicase v1.4.2
3113 │ │ │ [build-dependencies]
3114 │ │ │ └── version_check v0.1.5
3117 You can also display dependencies on multiple versions of the same crate with
3118 `cargo tree -d` (short for `cargo tree --duplicates`).
3122 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3123 the version in the sidebar.][69494]
3127 - [Rustc now correctly generates static libraries on Windows GNU targets with
3128 the `.a` extension, rather than the previous `.lib`.][70937]
3129 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3130 - [The `file_name` property in JSON output of macro errors now points the actual
3131 source file rather than the previous format of `<NAME macros>`.][70969]
3132 **Note:** this may not point to a file that actually exists on the user's system.
3133 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3134 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3135 not allow zero initialization such as `NonZeroU8`.][66059] This was
3136 previously a warning.
3137 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3138 operator has been defined as a saturating operation.][71269] This was previously
3139 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3140 continue using the current behaviour, which may be desirable in rare performance
3141 sensitive situations.
3145 These changes provide no direct user facing benefits, but represent significant
3146 improvements to the internals and overall performance of rustc and
3149 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3150 - [Replace big JS dict with JSON parsing.][71250]
3152 [69373]: https://github.com/rust-lang/rust/pull/69373/
3153 [66059]: https://github.com/rust-lang/rust/pull/66059/
3154 [68191]: https://github.com/rust-lang/rust/pull/68191/
3155 [68899]: https://github.com/rust-lang/rust/pull/68899/
3156 [71147]: https://github.com/rust-lang/rust/pull/71147/
3157 [71250]: https://github.com/rust-lang/rust/pull/71250/
3158 [70937]: https://github.com/rust-lang/rust/pull/70937/
3159 [70969]: https://github.com/rust-lang/rust/pull/70969/
3160 [70632]: https://github.com/rust-lang/rust/pull/70632/
3161 [70281]: https://github.com/rust-lang/rust/pull/70281/
3162 [70345]: https://github.com/rust-lang/rust/pull/70345/
3163 [70048]: https://github.com/rust-lang/rust/pull/70048/
3164 [70081]: https://github.com/rust-lang/rust/pull/70081/
3165 [70156]: https://github.com/rust-lang/rust/pull/70156/
3166 [71269]: https://github.com/rust-lang/rust/pull/71269/
3167 [69838]: https://github.com/rust-lang/rust/pull/69838/
3168 [69929]: https://github.com/rust-lang/rust/pull/69929/
3169 [69661]: https://github.com/rust-lang/rust/pull/69661/
3170 [69778]: https://github.com/rust-lang/rust/pull/69778/
3171 [69494]: https://github.com/rust-lang/rust/pull/69494/
3172 [69403]: https://github.com/rust-lang/rust/pull/69403/
3173 [69033]: https://github.com/rust-lang/rust/pull/69033/
3174 [68692]: https://github.com/rust-lang/rust/pull/68692/
3175 [68334]: https://github.com/rust-lang/rust/pull/68334/
3176 [67502]: https://github.com/rust-lang/rust/pull/67502/
3177 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3178 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3179 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3180 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3181 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3182 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3183 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3184 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3185 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3186 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3187 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3188 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3189 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3192 Version 1.43.1 (2020-05-07)
3193 ===========================
3195 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3196 * [Fixed the stabilization of AVX-512 features.][71473]
3197 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3199 [71430]: https://github.com/rust-lang/rust/pull/71430
3200 [71473]: https://github.com/rust-lang/rust/issues/71473
3201 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3204 Version 1.43.0 (2020-04-23)
3205 ==========================
3209 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3210 the type inferred correctly.][68129]
3211 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3213 **Syntax only changes**
3214 - [Allow `type Foo: Ord` syntactically.][69361]
3215 - [Fuse associated and extern items up to defaultness.][69194]
3216 - [Syntactically allow `self` in all `fn` contexts.][68764]
3217 - [Merge `fn` syntax + cleanup item parsing.][68728]
3218 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3219 For example, you may now write:
3221 macro_rules! mac_trait {
3231 These are still rejected *semantically*, so you will likely receive an error but
3232 these changes can be seen and parsed by macros and
3233 conditional compilation.
3238 - [You can now pass multiple lint flags to rustc to override the previous
3239 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3240 everything in the `unused` lint group except `unused-variables` which
3241 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3242 everything in the `unused` lint group **including** `unused-variables` since
3243 the allow flag is specified before the deny flag (and therefore overridden).
3244 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3245 if they are available on `windows-gnu`.][67429]
3246 - [rustc now buffers errors/warnings printed in JSON.][69227]
3250 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3251 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3252 respectively.][69538] **Note** These conversions are only available when `N`
3254 - [You can now use associated constants on floats and integers directly, rather
3255 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3256 `f32::NAN` with no imports.
3257 - [`u8::is_ascii` is now `const`.][68984]
3258 - [`String` now implements `AsMut<str>`.][68742]
3259 - [Added the `primitive` module to `std` and `core`.][67637] This module
3260 reexports Rust's primitive types. This is mainly useful in macros
3261 where you want avoid these types being shadowed.
3262 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3263 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3267 - [`Once::is_completed`]
3272 - [`iter::once_with`]
3276 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3277 your environment.][cargo/7823]
3278 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3279 executable path when running integration tests or benchmarks.][cargo/7697]
3280 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3281 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3285 - [Certain checks in the `const_err` lint were deemed unrelated to const
3286 evaluation][69185], and have been moved to the `unconditional_panic` and
3287 `arithmetic_overflow` lints.
3292 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3293 has been a warning since 1.36.0.
3294 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3295 led to some instances being accepted, and now correctly emits a hard error.
3297 [69340]: https://github.com/rust-lang/rust/pull/69340
3301 These changes provide no direct user facing benefits, but represent significant
3302 improvements to the internals and overall performance of `rustc` and
3305 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3306 - [Improved how rustc generates drop code.][67332]
3307 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3308 - [traits: preallocate 2 Vecs of known initial size][69022]
3309 - [Avoid exponential behaviour when relating types][68772]
3310 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3311 - [Improve performance of coherence checks][68966]
3312 - [Deduplicate types in the generator witness][68672]
3313 - [Invert control in struct_lint_level.][68725]
3315 [67332]: https://github.com/rust-lang/rust/pull/67332/
3316 [67429]: https://github.com/rust-lang/rust/pull/67429/
3317 [67637]: https://github.com/rust-lang/rust/pull/67637/
3318 [67642]: https://github.com/rust-lang/rust/pull/67642/
3319 [67878]: https://github.com/rust-lang/rust/pull/67878/
3320 [67885]: https://github.com/rust-lang/rust/pull/67885/
3321 [68129]: https://github.com/rust-lang/rust/pull/68129/
3322 [68672]: https://github.com/rust-lang/rust/pull/68672/
3323 [68725]: https://github.com/rust-lang/rust/pull/68725/
3324 [68728]: https://github.com/rust-lang/rust/pull/68728/
3325 [68738]: https://github.com/rust-lang/rust/pull/68738/
3326 [68742]: https://github.com/rust-lang/rust/pull/68742/
3327 [68764]: https://github.com/rust-lang/rust/pull/68764/
3328 [68772]: https://github.com/rust-lang/rust/pull/68772/
3329 [68943]: https://github.com/rust-lang/rust/pull/68943/
3330 [68952]: https://github.com/rust-lang/rust/pull/68952/
3331 [68966]: https://github.com/rust-lang/rust/pull/68966/
3332 [68984]: https://github.com/rust-lang/rust/pull/68984/
3333 [69022]: https://github.com/rust-lang/rust/pull/69022/
3334 [69185]: https://github.com/rust-lang/rust/pull/69185/
3335 [69194]: https://github.com/rust-lang/rust/pull/69194/
3336 [69201]: https://github.com/rust-lang/rust/pull/69201/
3337 [69227]: https://github.com/rust-lang/rust/pull/69227/
3338 [69548]: https://github.com/rust-lang/rust/pull/69548/
3339 [69256]: https://github.com/rust-lang/rust/pull/69256/
3340 [69361]: https://github.com/rust-lang/rust/pull/69361/
3341 [69366]: https://github.com/rust-lang/rust/pull/69366/
3342 [69538]: https://github.com/rust-lang/rust/pull/69538/
3343 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3344 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3345 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3346 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3347 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3348 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3349 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3350 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3353 Version 1.42.0 (2020-03-12)
3354 ==========================
3358 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3360 fn foo(words: &[&str]) {
3362 ["Hello", "World", "!", ..] => println!("Hello World!"),
3363 ["Foo", "Bar", ..] => println!("Baz"),
3364 rest => println!("{:?}", rest),
3368 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3369 that you can create an enum that has the exact layout and ABI of the type
3371 - [You can now use outer attribute procedural macros on inline modules.][64273]
3372 - [There are some *syntax-only* changes:][67131]
3373 - `default` is syntactically allowed before items in `trait` definitions.
3374 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3375 leave out their bodies in favor of `;`.
3376 - Bounds on associated types in `impl`s are now syntactically allowed
3377 (e.g. `type Foo: Ord;`).
3378 - `...` (the C-variadic type) may occur syntactically directly as the type of
3379 any function parameter.
3381 These are still rejected *semantically*, so you will likely receive an error
3382 but these changes can be seen and parsed by procedural macros and
3383 conditional compilation.
3387 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3388 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3389 - [`Option::{expect,unwrap}` and
3390 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3391 pointing to the location where they were called, rather than
3392 `core`'s internals. ][67887]
3394 \* Refer to Rust's [platform support page][platform-support-doc] for more
3395 information on Rust's tiered platform support.
3399 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3400 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3401 to implement `Sized`.][67935]
3402 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3403 - [`Layout::new` is now `const`.][66254]
3404 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3409 - [`CondVar::wait_while`]
3410 - [`CondVar::wait_timeout_while`]
3412 - [`DebugMap::value`]
3413 - [`ManuallyDrop::take`]
3415 - [`ptr::slice_from_raw_parts_mut`]
3416 - [`ptr::slice_from_raw_parts`]
3420 - [You no longer need to include `extern crate proc_macro;` to be able to
3421 `use proc_macro;` in the `2018` edition.][cargo/7700]
3425 - [`Error::description` has been deprecated, and its use will now produce a
3426 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3428 [68253]: https://github.com/rust-lang/rust/pull/68253/
3429 [68348]: https://github.com/rust-lang/rust/pull/68348/
3430 [67935]: https://github.com/rust-lang/rust/pull/67935/
3431 [68339]: https://github.com/rust-lang/rust/pull/68339/
3432 [68122]: https://github.com/rust-lang/rust/pull/68122/
3433 [64273]: https://github.com/rust-lang/rust/pull/64273/
3434 [67712]: https://github.com/rust-lang/rust/pull/67712/
3435 [67887]: https://github.com/rust-lang/rust/pull/67887/
3436 [67131]: https://github.com/rust-lang/rust/pull/67131/
3437 [67233]: https://github.com/rust-lang/rust/pull/67233/
3438 [66899]: https://github.com/rust-lang/rust/pull/66899/
3439 [66919]: https://github.com/rust-lang/rust/pull/66919/
3440 [66254]: https://github.com/rust-lang/rust/pull/66254/
3441 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3442 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3443 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3444 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3445 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3446 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3447 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3448 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3449 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3452 Version 1.41.1 (2020-02-27)
3453 ===========================
3455 * [Always check types of static items][69145]
3456 * [Always check lifetime bounds of `Copy` impls][69145]
3457 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3459 [69225]: https://github.com/rust-lang/rust/issues/69225
3460 [69145]: https://github.com/rust-lang/rust/pull/69145
3463 Version 1.41.0 (2020-01-30)
3464 ===========================
3469 - [You can now pass type parameters to foreign items when implementing
3470 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3471 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3472 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3473 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3474 - [You can now use any valid identifier in a `format_args` macro.][66847]
3475 Previously identifiers starting with an underscore were not allowed.
3476 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3477 enum variants.][66183] These are still rejected semantically, but
3478 can be seen and parsed by procedural macros and conditional compilation.
3479 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3480 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3481 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3483 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3488 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3489 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3490 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3491 - [You can now pass an arguments file passing the `@path` syntax
3492 to rustc.][66172] Note that the format differs somewhat from what is
3493 found in other tooling; please see [the documentation][argfile-docs] for
3495 - [You can now provide `--extern` flag without a path, indicating that it is
3496 available from the search path or specified with an `-L` flag.][64882]
3498 \* Refer to Rust's [platform support page][platform-support-doc] for more
3499 information on Rust's tiered platform support.
3501 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3506 - [The `core::panic` module is now stable.][66771] It was already stable
3508 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3509 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3510 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3515 - [`Result::map_or`]
3516 - [`Result::map_or_else`]
3517 - [`std::rc::Weak::weak_count`]
3518 - [`std::rc::Weak::strong_count`]
3519 - [`std::sync::Weak::weak_count`]
3520 - [`std::sync::Weak::strong_count`]
3525 - [Cargo will now document all the private items for binary crates
3526 by default.][cargo/7593]
3527 - [`cargo-install` will now reinstall the package if it detects that it is out
3528 of date.][cargo/7560]
3529 - [Cargo.lock now uses a more git friendly format that should help to reduce
3530 merge conflicts.][cargo/7579]
3531 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3532 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3533 optimisation level to `2` for debug builds. You can also use
3534 `[profile.<profile>.build-override]` to override build scripts and
3540 - [You can now specify `edition` in documentation code blocks to compile the block
3541 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3542 should be compiled the 2018 edition of Rust.
3543 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3544 current theme with `--check-theme`.][54733]
3545 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3550 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3551 Apple targets.][apple-32bit-drop] This means that the source code is still
3552 available to build, but the targets are no longer being tested and release
3553 binaries for those platforms will no longer be distributed by the Rust project.
3554 Please refer to the linked blog post for more information.
3556 [54733]: https://github.com/rust-lang/rust/pull/54733/
3557 [61351]: https://github.com/rust-lang/rust/pull/61351/
3558 [62514]: https://github.com/rust-lang/rust/pull/62514/
3559 [67255]: https://github.com/rust-lang/rust/pull/67255/
3560 [66661]: https://github.com/rust-lang/rust/pull/66661/
3561 [66771]: https://github.com/rust-lang/rust/pull/66771/
3562 [66847]: https://github.com/rust-lang/rust/pull/66847/
3563 [66238]: https://github.com/rust-lang/rust/pull/66238/
3564 [66277]: https://github.com/rust-lang/rust/pull/66277/
3565 [66325]: https://github.com/rust-lang/rust/pull/66325/
3566 [66172]: https://github.com/rust-lang/rust/pull/66172/
3567 [66183]: https://github.com/rust-lang/rust/pull/66183/
3568 [65879]: https://github.com/rust-lang/rust/pull/65879/
3569 [65013]: https://github.com/rust-lang/rust/pull/65013/
3570 [64882]: https://github.com/rust-lang/rust/pull/64882/
3571 [64325]: https://github.com/rust-lang/rust/pull/64325/
3572 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3573 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3574 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3575 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3576 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3577 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3578 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3579 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3580 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3581 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3582 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3584 Version 1.40.0 (2019-12-19)
3585 ===========================
3589 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3590 `const` contexts.][65188] e.g.
3593 pub struct Point(i32, i32);
3595 const ORIGIN: Point = {
3596 let constructor = Point;
3602 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3603 indicate that there may be variants or fields added in the future.][64639]
3604 For example this requires adding a wild-card branch (`_ => {}`) to any match
3605 statements on a non-exhaustive `enum`. [(RFC 2008)]
3606 - [You can now use function-like procedural macros in `extern` blocks and in
3607 type positions.][63931] e.g. `type Generated = macro!();`
3608 - [Function-like and attribute procedural macros can now emit
3609 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3610 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3611 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3612 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3616 - [Added tier 3 support\* for the
3617 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3618 - [Added tier 3 support for the
3619 `aarch64-unknown-none-softfloat` target.][64589]
3620 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3621 `mips64el-unknown-linux-muslabi64` targets.][65843]
3623 \* Refer to Rust's [platform support page][platform-support-doc] for more
3624 information on Rust's tiered platform support.
3628 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3632 - [`BTreeMap::get_key_value`]
3633 - [`HashMap::get_key_value`]
3634 - [`Option::as_deref_mut`]
3635 - [`Option::as_deref`]
3636 - [`Option::flatten`]
3637 - [`UdpSocket::peer_addr`]
3638 - [`f32::to_be_bytes`]
3639 - [`f32::to_le_bytes`]
3640 - [`f32::to_ne_bytes`]
3641 - [`f64::to_be_bytes`]
3642 - [`f64::to_le_bytes`]
3643 - [`f64::to_ne_bytes`]
3644 - [`f32::from_be_bytes`]
3645 - [`f32::from_le_bytes`]
3646 - [`f32::from_ne_bytes`]
3647 - [`f64::from_be_bytes`]
3648 - [`f64::from_le_bytes`]
3649 - [`f64::from_ne_bytes`]
3656 - [Cargo will now always display warnings, rather than only on
3657 fresh builds.][cargo/7450]
3658 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3659 now produce an error.][cargo/7507] Previously these flags were ignored.
3660 - [You can now publish `dev-dependencies` without including
3661 a `version`.][cargo/7333]
3665 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3666 when running documentation tests with `rustdoc`.][63803]
3670 - [As previously announced, any previous NLL warnings in the 2015 edition are
3671 now hard errors.][64221]
3672 - [The `include!` macro will now warn if it failed to include the
3673 entire file.][64284] The `include!` macro unintentionally only includes the
3674 first _expression_ in a file, and this can be unintuitive. This will become
3675 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3676 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3677 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3678 or `extern` blocks now correctly emits a hard error.
3680 [65294]: https://github.com/rust-lang/rust/pull/65294/
3681 [66103]: https://github.com/rust-lang/rust/pull/66103/
3682 [65843]: https://github.com/rust-lang/rust/pull/65843/
3683 [65188]: https://github.com/rust-lang/rust/pull/65188/
3684 [65092]: https://github.com/rust-lang/rust/pull/65092/
3685 [64589]: https://github.com/rust-lang/rust/pull/64589/
3686 [64639]: https://github.com/rust-lang/rust/pull/64639/
3687 [64221]: https://github.com/rust-lang/rust/pull/64221/
3688 [64284]: https://github.com/rust-lang/rust/pull/64284/
3689 [63931]: https://github.com/rust-lang/rust/pull/63931/
3690 [64035]: https://github.com/rust-lang/rust/pull/64035/
3691 [63674]: https://github.com/rust-lang/rust/pull/63674/
3692 [63803]: https://github.com/rust-lang/rust/pull/63803/
3693 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3694 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3695 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3696 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3697 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3698 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3699 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3700 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3701 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3702 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3703 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3704 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3705 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3706 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3707 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3708 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3709 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3710 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3711 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3712 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3713 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3714 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3715 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3716 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3717 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3720 Version 1.39.0 (2019-11-07)
3721 ===========================
3725 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3726 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3727 - [You can now use certain attributes on function, closure, and function pointer
3728 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3729 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3730 attributes applied to items. e.g.
3733 #[cfg(windows)] slice: &[u16],
3734 #[cfg(not(windows))] slice: &[u8],
3739 - [You can now take shared references to bind-by-move patterns in the `if` guards
3740 of `match` arms.][63118] e.g.
3743 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3747 // ---- `nums` is bound by move.
3748 if nums.iter().sum::<u8>() == 10
3749 // ^------ `.iter()` implicitly takes a reference to `nums`.
3752 // ----------- Legal as `nums` was bound by move and so we have ownership.
3754 _ => unreachable!(),
3763 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3764 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3765 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3766 **Note** Cargo currently doesn't use this feature. Refer to
3767 [cargo#7315][cargo/7315] to track this feature's progress.
3768 - [You can now pass `--show-output` argument to test binaries to print the
3769 output of successful tests.][62600]
3772 \* Refer to Rust's [platform support page][platform-support-doc] for more
3773 information on Rust's tiered platform support.
3777 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3778 - [`LinkedList::new` is now a `const` function.][63684]
3779 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3780 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3781 now `const`.][63786]
3785 - [`Pin::into_inner`]
3786 - [`Instant::checked_duration_since`]
3787 - [`Instant::saturating_duration_since`]
3791 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3792 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3793 `--all` is now deprecated.
3797 - [You can now pass `-Clinker` to rustdoc to control the linker used
3798 for compiling doctests.][63834]
3802 - [Code that was previously accepted by the old borrow checker, but rejected by
3803 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3804 previously a warning, and will also become a hard error in the Rust 2015
3805 edition in the 1.40.0 release.
3806 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3807 run tests.][63827] This should improve performance when running a large
3809 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3810 recommended to use the `?` operator instead.
3811 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3814 [62600]: https://github.com/rust-lang/rust/pull/62600/
3815 [62672]: https://github.com/rust-lang/rust/pull/62672/
3816 [63118]: https://github.com/rust-lang/rust/pull/63118/
3817 [63209]: https://github.com/rust-lang/rust/pull/63209/
3818 [63402]: https://github.com/rust-lang/rust/pull/63402/
3819 [63565]: https://github.com/rust-lang/rust/pull/63565/
3820 [63595]: https://github.com/rust-lang/rust/pull/63595/
3821 [63684]: https://github.com/rust-lang/rust/pull/63684/
3822 [63698]: https://github.com/rust-lang/rust/pull/63698/
3823 [63770]: https://github.com/rust-lang/rust/pull/63770/
3824 [63786]: https://github.com/rust-lang/rust/pull/63786/
3825 [63827]: https://github.com/rust-lang/rust/pull/63827/
3826 [63834]: https://github.com/rust-lang/rust/pull/63834/
3827 [64010]: https://github.com/rust-lang/rust/pull/64010/
3828 [64028]: https://github.com/rust-lang/rust/pull/64028/
3829 [64334]: https://github.com/rust-lang/rust/pull/64334/
3830 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3831 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3832 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3833 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3834 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3835 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3837 Version 1.38.0 (2019-09-26)
3838 ==========================
3842 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3843 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3847 - [Added pipelined compilation support to `rustc`.][62766] This will
3848 improve compilation times in some cases. For further information please refer
3849 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3850 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3851 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3852 `x86_64-uwp-windows-msvc` targets.][60260]
3853 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3854 `armv7-unknown-linux-musleabi` targets.][63107]
3855 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3856 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3857 - [Upgraded to LLVM 9.][62592]
3859 \* Refer to Rust's [platform support page][platform-support-doc] for more
3860 information on Rust's tiered platform support.
3864 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3865 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3866 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3867 is available at `std::clone::Clone`). This also makes all built-in macros
3868 available in `std`/`core` root. e.g. `std::include_bytes!`.
3869 - [`str::Chars` now implements `Debug`.][63000]
3870 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3871 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3872 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3873 - [Added euclidean remainder and division operations (`div_euclid`,
3874 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3875 `overflowing`, and `wrapping` versions are available for all
3877 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3878 `PartialEq`.][61491]
3879 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3883 - [`<*const T>::cast`]
3884 - [`<*mut T>::cast`]
3885 - [`Duration::as_secs_f32`]
3886 - [`Duration::as_secs_f64`]
3887 - [`Duration::div_f32`]
3888 - [`Duration::div_f64`]
3889 - [`Duration::from_secs_f32`]
3890 - [`Duration::from_secs_f64`]
3891 - [`Duration::mul_f32`]
3892 - [`Duration::mul_f64`]
3893 - [`any::type_name`]
3897 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3898 - [You can now pass the `--features` option multiple times to enable
3899 multiple features.][cargo/7084]
3904 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3908 - [`rustc` will now warn about some incorrect uses of
3909 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3913 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3915 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3916 issues][62896] with certain crates such as libc.
3918 [60260]: https://github.com/rust-lang/rust/pull/60260/
3919 [61457]: https://github.com/rust-lang/rust/pull/61457/
3920 [61491]: https://github.com/rust-lang/rust/pull/61491/
3921 [61884]: https://github.com/rust-lang/rust/pull/61884/
3922 [61953]: https://github.com/rust-lang/rust/pull/61953/
3923 [62042]: https://github.com/rust-lang/rust/pull/62042/
3924 [62528]: https://github.com/rust-lang/rust/pull/62528/
3925 [62583]: https://github.com/rust-lang/rust/pull/62583/
3926 [62735]: https://github.com/rust-lang/rust/pull/62735/
3927 [62766]: https://github.com/rust-lang/rust/pull/62766/
3928 [62784]: https://github.com/rust-lang/rust/pull/62784/
3929 [62592]: https://github.com/rust-lang/rust/pull/62592/
3930 [62785]: https://github.com/rust-lang/rust/issues/62785/
3931 [62814]: https://github.com/rust-lang/rust/pull/62814/
3932 [62896]: https://github.com/rust-lang/rust/issues/62896/
3933 [63000]: https://github.com/rust-lang/rust/pull/63000/
3934 [63056]: https://github.com/rust-lang/rust/pull/63056/
3935 [63107]: https://github.com/rust-lang/rust/pull/63107/
3936 [63346]: https://github.com/rust-lang/rust/pull/63346/
3937 [63421]: https://github.com/rust-lang/rust/pull/63421/
3938 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3939 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3940 [63048]: https://github.com/rust-lang/rust/pull/63048
3941 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3942 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3943 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3944 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3945 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3946 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3947 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3948 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3949 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3950 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3951 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3952 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3953 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3955 Version 1.37.0 (2019-08-15)
3956 ==========================
3960 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3961 [`Box`][62228], or an [array][62235] and unused.
3962 - [You can now use the `cfg` and `cfg_attr` attributes on
3963 generic parameters.][61547]
3964 - [You can now use enum variants through type alias.][61682] e.g. You can
3965 write the following:
3967 type MyOption = Option<u8>;
3969 fn increment_or_zero(x: MyOption) -> u8 {
3971 MyOption::Some(y) => y + 1,
3972 MyOption::None => 0,
3976 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3977 `const _: u32 = 5;`.
3978 - [You can now use `#[repr(align(X)]` on enums.][61229]
3979 - [The `?` Kleene macro operator is now available in the
3980 2015 edition.][60932]
3984 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3985 and `-C profile-use` flags.][61268] For more information on how to use profile
3986 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3987 - [The `rust-lldb` wrapper script should now work again.][61827]
3991 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3995 - [`BufReader::buffer`]
3996 - [`BufWriter::buffer`]
3997 - [`Cell::from_mut`]
3998 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3999 - [`DoubleEndedIterator::nth_back`]
4001 - [`Wrapping::reverse_bits`]
4002 - [`i128::reverse_bits`]
4003 - [`i16::reverse_bits`]
4004 - [`i32::reverse_bits`]
4005 - [`i64::reverse_bits`]
4006 - [`i8::reverse_bits`]
4007 - [`isize::reverse_bits`]
4008 - [`slice::copy_within`]
4009 - [`u128::reverse_bits`]
4010 - [`u16::reverse_bits`]
4011 - [`u32::reverse_bits`]
4012 - [`u64::reverse_bits`]
4013 - [`u8::reverse_bits`]
4014 - [`usize::reverse_bits`]
4018 - [`Cargo.lock` files are now included by default when publishing executable crates
4019 with executables.][cargo/7026]
4020 - [You can now specify `default-run="foo"` in `[package]` to specify the
4021 default executable to use for `cargo run`.][cargo/7056]
4028 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4029 Please transition your code to using the `..=` syntax for inclusive
4031 - [Using a trait object without the `dyn` will now warn by default.][61203]
4032 Please transition your code to use `dyn Trait` for trait objects instead.
4034 [62228]: https://github.com/rust-lang/rust/pull/62228/
4035 [62235]: https://github.com/rust-lang/rust/pull/62235/
4036 [61802]: https://github.com/rust-lang/rust/pull/61802/
4037 [61827]: https://github.com/rust-lang/rust/pull/61827/
4038 [61547]: https://github.com/rust-lang/rust/pull/61547/
4039 [61682]: https://github.com/rust-lang/rust/pull/61682/
4040 [61268]: https://github.com/rust-lang/rust/pull/61268/
4041 [61342]: https://github.com/rust-lang/rust/pull/61342/
4042 [61347]: https://github.com/rust-lang/rust/pull/61347/
4043 [61100]: https://github.com/rust-lang/rust/pull/61100/
4044 [61203]: https://github.com/rust-lang/rust/pull/61203/
4045 [61229]: https://github.com/rust-lang/rust/pull/61229/
4046 [60932]: https://github.com/rust-lang/rust/pull/60932/
4047 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4048 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4049 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4050 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4051 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4052 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4053 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4054 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4055 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4056 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4057 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4058 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4059 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4060 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4061 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4062 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4063 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4064 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4065 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4066 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4067 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4068 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4069 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4072 Version 1.36.0 (2019-07-04)
4073 ==========================
4077 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4078 - [The order of traits in trait objects no longer affects the semantics of that
4079 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4080 `dyn fmt::Debug + Send`, where this was previously not the case.
4084 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4085 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4086 - [`mem::needs_drop` is now available as a const fn.][60364]
4087 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4088 - [`String` now implements `BorrowMut<str>`.][60404]
4089 - [`io::Cursor` now implements `Default`.][60234]
4090 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4091 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4092 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4093 environment has access to heap memory allocation.
4094 - [`String` now implements `From<&String>`.][59825]
4095 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4096 return a tuple of each argument when there is multiple arguments.
4097 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4102 - [`VecDeque::rotate_left`]
4103 - [`VecDeque::rotate_right`]
4104 - [`Iterator::copied`]
4106 - [`io::IoSliceMut`]
4107 - [`Read::read_vectored`]
4108 - [`Write::write_vectored`]
4109 - [`str::as_mut_ptr`]
4110 - [`mem::MaybeUninit`]
4111 - [`pointer::align_offset`]
4112 - [`future::Future`]
4114 - [`task::RawWaker`]
4115 - [`task::RawWakerVTable`]
4121 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4122 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4124 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4128 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4135 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4136 longer recommended, and will be deprecated in 1.39.0.
4138 [60318]: https://github.com/rust-lang/rust/pull/60318/
4139 [60364]: https://github.com/rust-lang/rust/pull/60364/
4140 [60370]: https://github.com/rust-lang/rust/pull/60370/
4141 [60404]: https://github.com/rust-lang/rust/pull/60404/
4142 [60234]: https://github.com/rust-lang/rust/pull/60234/
4143 [60244]: https://github.com/rust-lang/rust/pull/60244/
4144 [58623]: https://github.com/rust-lang/rust/pull/58623/
4145 [59648]: https://github.com/rust-lang/rust/pull/59648/
4146 [59675]: https://github.com/rust-lang/rust/pull/59675/
4147 [59825]: https://github.com/rust-lang/rust/pull/59825/
4148 [59826]: https://github.com/rust-lang/rust/pull/59826/
4149 [59445]: https://github.com/rust-lang/rust/pull/59445/
4150 [59114]: https://github.com/rust-lang/rust/pull/59114/
4151 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4152 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4153 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4154 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4155 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4156 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4157 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4158 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4159 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4160 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4161 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4162 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4163 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4164 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4165 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4166 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4167 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4168 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4169 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4170 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4173 Version 1.35.0 (2019-05-23)
4174 ==========================
4178 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4179 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4180 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4182 unsafe fn call_unsafe(func: unsafe fn()) {
4187 unsafe { call_unsafe(|| {}); }
4194 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4195 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4196 - [Added the `wasm32-unknown-wasi` target.][59464]
4201 - [`Thread` will now show its ID in `Debug` output.][59460]
4202 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4203 - [`alloc::System` now implements `Default`.][59451]
4204 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4206 - [`char::{ToLowercase, ToUppercase}` now
4207 implement `ExactSizeIterator`.][58778]
4208 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4209 - [Removed the `Read` trait bounds
4210 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4211 - [You can now call the `dbg!` macro without any parameters to print the file
4212 and line where it is called.][57847]
4213 - [In place ASCII case conversions are now up to 4× faster.][59283]
4214 e.g. `str::make_ascii_lowercase`
4215 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4222 - [`RefCell::replace_with`]
4223 - [`RefCell::map_split`]
4225 - [`Range::contains`]
4226 - [`RangeFrom::contains`]
4227 - [`RangeTo::contains`]
4228 - [`RangeInclusive::contains`]
4229 - [`RangeToInclusive::contains`]
4230 - [`Option::copied`]
4234 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4235 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4240 - [The Rust toolchain is now available natively for musl based distros.][58575]
4242 [59460]: https://github.com/rust-lang/rust/pull/59460/
4243 [59464]: https://github.com/rust-lang/rust/pull/59464/
4244 [59500]: https://github.com/rust-lang/rust/pull/59500/
4245 [59512]: https://github.com/rust-lang/rust/pull/59512/
4246 [59580]: https://github.com/rust-lang/rust/pull/59580/
4247 [59283]: https://github.com/rust-lang/rust/pull/59283/
4248 [59451]: https://github.com/rust-lang/rust/pull/59451/
4249 [59076]: https://github.com/rust-lang/rust/pull/59076/
4250 [58778]: https://github.com/rust-lang/rust/pull/58778/
4251 [58717]: https://github.com/rust-lang/rust/pull/58717/
4252 [58369]: https://github.com/rust-lang/rust/pull/58369/
4253 [58423]: https://github.com/rust-lang/rust/pull/58423/
4254 [58080]: https://github.com/rust-lang/rust/pull/58080/
4255 [57847]: https://github.com/rust-lang/rust/pull/57847/
4256 [58575]: https://github.com/rust-lang/rust/pull/58575
4257 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4258 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4259 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4260 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4261 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4262 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4263 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4264 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4265 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4266 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4267 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4268 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4270 Version 1.34.2 (2019-05-14)
4271 ===========================
4273 * [Destabilize the `Error::type_id` function due to a security
4274 vulnerability][60785] ([CVE-2019-12083])
4276 [60785]: https://github.com/rust-lang/rust/pull/60785
4277 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4279 Version 1.34.1 (2019-04-25)
4280 ===========================
4282 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4283 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4284 * [Fix Clippy panic when checking some macros][clippy/3805]
4286 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4287 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4288 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4290 Version 1.34.0 (2019-04-11)
4291 ==========================
4295 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4296 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4298 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4299 `#[attr{}]` procedural macros.][57367]
4300 - [You can now write `extern crate self as foo;`][57407] to import your
4301 crate's root into the extern prelude.
4306 - [You can now target `riscv64imac-unknown-none-elf` and
4307 `riscv64gc-unknown-none-elf`.][58406]
4308 - [You can now enable linker plugin LTO optimisations with
4309 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4310 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4312 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4317 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4318 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4319 the `Hash` trait to create an iterator.
4320 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4321 methods.][58421] Most notably you no longer require the `Ord` trait to create
4323 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4324 for all numeric types.][58044]
4325 - [Indexing a `str` is now generic over all types that
4326 implement `SliceIndex<str>`.][57604]
4327 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4328 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4329 produce a warning if their returning type is unused.
4330 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4331 `overflowing_pow` are now available for all numeric types.][57873] These are
4332 equivalent to methods such as `wrapping_add` for the `pow` operation.
4340 * [`Error::type_id`]
4341 * [`atomic::AtomicI16`]
4342 * [`atomic::AtomicI32`]
4343 * [`atomic::AtomicI64`]
4344 * [`atomic::AtomicI8`]
4345 * [`atomic::AtomicU16`]
4346 * [`atomic::AtomicU32`]
4347 * [`atomic::AtomicU64`]
4348 * [`atomic::AtomicU8`]
4349 * [`convert::Infallible`]
4350 * [`convert::TryFrom`]
4351 * [`convert::TryInto`]
4353 * [`iter::successors`]
4354 * [`num::NonZeroI128`]
4355 * [`num::NonZeroI16`]
4356 * [`num::NonZeroI32`]
4357 * [`num::NonZeroI64`]
4358 * [`num::NonZeroI8`]
4359 * [`num::NonZeroIsize`]
4360 * [`slice::sort_by_cached_key`]
4361 * [`str::escape_debug`]
4362 * [`str::escape_default`]
4363 * [`str::escape_unicode`]
4364 * [`str::split_ascii_whitespace`]
4367 * [`Instant::checked_add`]
4368 * [`Instant::checked_sub`]
4369 * [`SystemTime::checked_add`]
4370 * [`SystemTime::checked_sub`]
4374 - [You can now use alternative registries to crates.io.][cargo/6654]
4378 - [You can now use the `?` operator in your documentation tests without manually
4379 adding `fn main() -> Result<(), _> {}`.][56470]
4383 - [`Command::before_exec` is being replaced by the unsafe method
4384 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4385 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4386 can now use `const` functions in `static` variables.
4388 [58370]: https://github.com/rust-lang/rust/pull/58370/
4389 [58406]: https://github.com/rust-lang/rust/pull/58406/
4390 [58421]: https://github.com/rust-lang/rust/pull/58421/
4391 [58166]: https://github.com/rust-lang/rust/pull/58166/
4392 [58044]: https://github.com/rust-lang/rust/pull/58044/
4393 [58057]: https://github.com/rust-lang/rust/pull/58057/
4394 [58059]: https://github.com/rust-lang/rust/pull/58059/
4395 [57809]: https://github.com/rust-lang/rust/pull/57809/
4396 [57873]: https://github.com/rust-lang/rust/pull/57873/
4397 [57604]: https://github.com/rust-lang/rust/pull/57604/
4398 [57367]: https://github.com/rust-lang/rust/pull/57367/
4399 [57407]: https://github.com/rust-lang/rust/pull/57407/
4400 [57425]: https://github.com/rust-lang/rust/pull/57425/
4401 [57106]: https://github.com/rust-lang/rust/pull/57106/
4402 [56470]: https://github.com/rust-lang/rust/pull/56470/
4403 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4404 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4405 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4406 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4407 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4408 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4409 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4410 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4411 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4412 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4413 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4414 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4415 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4416 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4417 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4418 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4419 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4420 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4421 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4422 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4423 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4424 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4425 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4426 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4427 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4428 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4429 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4430 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4431 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4432 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4433 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4436 Version 1.33.0 (2019-02-28)
4437 ==========================
4441 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4442 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4443 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4444 E.g. You can have match statement on a `u8` that covers `0..=255` and
4445 you would no longer be required to have a `_ => unreachable!()` case.
4446 - [You can now have multiple patterns in `if let` and `while let`
4447 expressions.][57532] You can do this with the same syntax as a `match`
4457 let state = Creature::Crab("Ferris");
4459 if let Creature::Crab(name) | Creature::Person(name) = state {
4460 println!("This creature's name is: {}", name);
4464 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4465 this feature will by default produce a warning as this behaviour can be
4466 unintuitive. E.g. `if let _ = 5 {}`
4467 - [You can now use `let` bindings, assignments, expression statements,
4468 and irrefutable pattern destructuring in const functions.][57175]
4469 - [You can now call unsafe const functions.][57067] E.g.
4471 const unsafe fn foo() -> i32 { 5 }
4472 const fn bar() -> i32 {
4476 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4477 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4478 - [You can now specify a specific alignment with the `#[repr(packed)]`
4479 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4480 with an alignment of 2 bytes and a size of 6 bytes.
4481 - [You can now import an item from a module as an `_`.][56303] This allows you to
4482 import a trait's impls, and not have the name in the namespace. E.g.
4484 use std::io::Read as _;
4486 // Allowed as there is only one `Read` in the module.
4489 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4493 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4494 command line argument.][56351]
4495 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4496 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4497 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4498 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4499 information on Rust's platform support.
4500 - [Added support for the `thumbv7neon-linux-androideabi` and
4501 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4502 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4506 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4507 functions for all numeric types.][57566]
4508 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4509 are now `const` functions for all numeric types.][57105]
4510 - [The methods `is_positive` and `is_negative` are now `const` functions for
4511 all signed numeric types.][57105]
4512 - [The `get` method for all `NonZero` types is now `const`.][57167]
4513 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4514 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4515 numeric types.][57234]
4516 - [`Ipv4Addr::new` is now a `const` function][57234]
4520 - [`unix::FileExt::read_exact_at`]
4521 - [`unix::FileExt::write_all_at`]
4522 - [`Option::transpose`]
4523 - [`Result::transpose`]
4524 - [`convert::identity`]
4527 - [`marker::PhantomPinned`]
4528 - [`Vec::resize_with`]
4529 - [`VecDeque::resize_with`]
4530 - [`Duration::as_millis`]
4531 - [`Duration::as_micros`]
4532 - [`Duration::as_nanos`]
4537 - [You can now publish crates that require a feature flag to compile with
4538 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4539 - [Cargo should now rebuild a crate if a file was modified during the initial
4544 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4545 are now deprecated in the standard library, and their usage will now produce a warning.
4546 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4548 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4550 - [Libtest no longer creates a new thread for each test when
4551 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4553 [56243]: https://github.com/rust-lang/rust/pull/56243
4554 [56303]: https://github.com/rust-lang/rust/pull/56303/
4555 [56351]: https://github.com/rust-lang/rust/pull/56351/
4556 [56362]: https://github.com/rust-lang/rust/pull/56362
4557 [56642]: https://github.com/rust-lang/rust/pull/56642/
4558 [56769]: https://github.com/rust-lang/rust/pull/56769/
4559 [56805]: https://github.com/rust-lang/rust/pull/56805
4560 [56947]: https://github.com/rust-lang/rust/pull/56947/
4561 [57049]: https://github.com/rust-lang/rust/pull/57049/
4562 [57067]: https://github.com/rust-lang/rust/pull/57067/
4563 [57105]: https://github.com/rust-lang/rust/pull/57105
4564 [57130]: https://github.com/rust-lang/rust/pull/57130/
4565 [57167]: https://github.com/rust-lang/rust/pull/57167/
4566 [57175]: https://github.com/rust-lang/rust/pull/57175/
4567 [57234]: https://github.com/rust-lang/rust/pull/57234/
4568 [57332]: https://github.com/rust-lang/rust/pull/57332/
4569 [57465]: https://github.com/rust-lang/rust/pull/57465/
4570 [57532]: https://github.com/rust-lang/rust/pull/57532/
4571 [57535]: https://github.com/rust-lang/rust/pull/57535/
4572 [57566]: https://github.com/rust-lang/rust/pull/57566/
4573 [57615]: https://github.com/rust-lang/rust/pull/57615/
4574 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4575 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4576 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4577 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4578 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4579 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4580 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4581 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4582 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4583 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4584 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4585 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4586 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4587 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4588 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4589 [platform-support]: https://forge.rust-lang.org/platform-support.html
4591 Version 1.32.0 (2019-01-17)
4592 ==========================
4597 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4598 operator allows you to specify zero or one repetitions similar to the `*` and
4600 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4601 now always resolve to the item (`enum`, `struct`, etc.) available in the
4602 module if present, before resolving to a external crate or an item the prelude.][56759]
4605 enum Color { Red, Green, Blue }
4611 - [You can now match against `PhantomData<T>` types.][55837]
4612 - [You can now match against literals in macros with the `literal`
4613 specifier.][56072] This will match against a literal of any type.
4614 E.g. `1`, `'A'`, `"Hello World"`
4615 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4617 struct Point(i32, i32);
4620 pub fn new(x: i32, y: i32) -> Self {
4624 pub fn is_origin(&self) -> bool {
4632 - [Self can also now be used in type definitions.][56366] E.g.
4636 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4639 Cons(T, Box<Self>) // likewise here
4642 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4643 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4647 - [The default allocator has changed from jemalloc to the default allocator on
4648 your system.][55238] The compiler itself on Linux & macOS will still use
4649 jemalloc, but programs compiled with it will use the system allocator.
4650 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4654 - [`PathBuf` now implements `FromStr`.][55148]
4655 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4656 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4657 easily debug expressions in your rust program. E.g.
4660 let b = dbg!(a * 2) + 1;
4661 // ^-- prints: [src/main.rs:4] a * 2 = 4
4665 The following APIs are now `const` functions and can be used in a
4669 - [`UnsafeCell::get`]
4670 - [`char::is_ascii`]
4672 - [`ManuallyDrop::new`]
4673 - [`ManuallyDrop::into_inner`]
4674 - [`RangeInclusive::start`]
4675 - [`RangeInclusive::end`]
4676 - [`NonNull::as_ptr`]
4679 - [`Duration::as_secs`]
4680 - [`Duration::subsec_millis`]
4681 - [`Duration::subsec_micros`]
4682 - [`Duration::subsec_nanos`]
4684 - [`Ipv4Addr::is_unspecified`]
4686 - [`Ipv6Addr::octets`]
4690 - [`i8::to_be_bytes`]
4691 - [`i8::to_le_bytes`]
4692 - [`i8::to_ne_bytes`]
4693 - [`i8::from_be_bytes`]
4694 - [`i8::from_le_bytes`]
4695 - [`i8::from_ne_bytes`]
4696 - [`i16::to_be_bytes`]
4697 - [`i16::to_le_bytes`]
4698 - [`i16::to_ne_bytes`]
4699 - [`i16::from_be_bytes`]
4700 - [`i16::from_le_bytes`]
4701 - [`i16::from_ne_bytes`]
4702 - [`i32::to_be_bytes`]
4703 - [`i32::to_le_bytes`]
4704 - [`i32::to_ne_bytes`]
4705 - [`i32::from_be_bytes`]
4706 - [`i32::from_le_bytes`]
4707 - [`i32::from_ne_bytes`]
4708 - [`i64::to_be_bytes`]
4709 - [`i64::to_le_bytes`]
4710 - [`i64::to_ne_bytes`]
4711 - [`i64::from_be_bytes`]
4712 - [`i64::from_le_bytes`]
4713 - [`i64::from_ne_bytes`]
4714 - [`i128::to_be_bytes`]
4715 - [`i128::to_le_bytes`]
4716 - [`i128::to_ne_bytes`]
4717 - [`i128::from_be_bytes`]
4718 - [`i128::from_le_bytes`]
4719 - [`i128::from_ne_bytes`]
4720 - [`isize::to_be_bytes`]
4721 - [`isize::to_le_bytes`]
4722 - [`isize::to_ne_bytes`]
4723 - [`isize::from_be_bytes`]
4724 - [`isize::from_le_bytes`]
4725 - [`isize::from_ne_bytes`]
4726 - [`u8::to_be_bytes`]
4727 - [`u8::to_le_bytes`]
4728 - [`u8::to_ne_bytes`]
4729 - [`u8::from_be_bytes`]
4730 - [`u8::from_le_bytes`]
4731 - [`u8::from_ne_bytes`]
4732 - [`u16::to_be_bytes`]
4733 - [`u16::to_le_bytes`]
4734 - [`u16::to_ne_bytes`]
4735 - [`u16::from_be_bytes`]
4736 - [`u16::from_le_bytes`]
4737 - [`u16::from_ne_bytes`]
4738 - [`u32::to_be_bytes`]
4739 - [`u32::to_le_bytes`]
4740 - [`u32::to_ne_bytes`]
4741 - [`u32::from_be_bytes`]
4742 - [`u32::from_le_bytes`]
4743 - [`u32::from_ne_bytes`]
4744 - [`u64::to_be_bytes`]
4745 - [`u64::to_le_bytes`]
4746 - [`u64::to_ne_bytes`]
4747 - [`u64::from_be_bytes`]
4748 - [`u64::from_le_bytes`]
4749 - [`u64::from_ne_bytes`]
4750 - [`u128::to_be_bytes`]
4751 - [`u128::to_le_bytes`]
4752 - [`u128::to_ne_bytes`]
4753 - [`u128::from_be_bytes`]
4754 - [`u128::from_le_bytes`]
4755 - [`u128::from_ne_bytes`]
4756 - [`usize::to_be_bytes`]
4757 - [`usize::to_le_bytes`]
4758 - [`usize::to_ne_bytes`]
4759 - [`usize::from_be_bytes`]
4760 - [`usize::from_le_bytes`]
4761 - [`usize::from_ne_bytes`]
4765 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4766 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4770 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4774 - [The argument types for AVX's
4775 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4776 been changed from `*const` to `*mut` as the previous implementation
4780 [55148]: https://github.com/rust-lang/rust/pull/55148/
4781 [55238]: https://github.com/rust-lang/rust/pull/55238/
4782 [55280]: https://github.com/rust-lang/rust/pull/55280/
4783 [55610]: https://github.com/rust-lang/rust/pull/55610/
4784 [55663]: https://github.com/rust-lang/rust/pull/55663/
4785 [55702]: https://github.com/rust-lang/rust/pull/55702/
4786 [55837]: https://github.com/rust-lang/rust/pull/55837/
4787 [55843]: https://github.com/rust-lang/rust/pull/55843/
4788 [56072]: https://github.com/rust-lang/rust/pull/56072/
4789 [56245]: https://github.com/rust-lang/rust/pull/56245/
4790 [56365]: https://github.com/rust-lang/rust/pull/56365/
4791 [56366]: https://github.com/rust-lang/rust/pull/56366/
4792 [56395]: https://github.com/rust-lang/rust/pull/56395/
4793 [56759]: https://github.com/rust-lang/rust/pull/56759/
4794 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4795 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4796 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4797 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4798 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4799 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4800 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4801 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4802 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4803 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4804 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4805 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4806 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4807 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4808 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4809 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4810 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4811 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4812 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4813 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4814 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4815 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4816 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4817 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4818 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4819 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4820 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4821 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4822 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4823 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4824 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4825 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4826 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4827 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4828 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4829 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4830 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4831 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4832 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4833 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4834 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4835 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4836 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4837 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4838 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4839 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4840 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4841 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4842 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4843 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4844 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4845 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4846 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4847 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4848 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4849 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4850 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4851 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4852 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4853 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4854 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4855 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4856 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4857 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4858 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4859 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4860 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4861 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4862 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4863 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4864 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4865 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4866 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4867 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4868 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4869 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4870 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4871 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4872 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4873 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4874 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4875 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4876 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4877 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4878 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4879 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4880 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4881 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4882 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4883 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4884 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4885 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4886 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4889 Version 1.31.1 (2018-12-20)
4890 ===========================
4892 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4893 - [Fix broken go-to-definition in RLS][rls/1171]
4894 - [Fix infinite loop on hover in RLS][rls/1170]
4896 [56562]: https://github.com/rust-lang/rust/pull/56562
4897 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4898 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4900 Version 1.31.0 (2018-12-06)
4901 ==========================
4905 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4906 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4907 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4908 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4910 - [You can now define and use `const` functions.][54835] These are currently
4911 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4912 [language reference][const-reference] for what exactly is available.
4913 - [You can now use tool lints, which allow you to scope lints from external
4914 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4915 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4916 a crate, not just in exported functions.][54451]
4917 - [You can now use parentheses in pattern matches.][54497]
4921 - [Updated musl to 1.1.20][54430]
4925 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4926 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4927 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4928 into `Option<&mut T>` using the `From` trait.][53218]
4929 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4934 - [`slice::align_to`]
4935 - [`slice::align_to_mut`]
4936 - [`slice::chunks_exact`]
4937 - [`slice::chunks_exact_mut`]
4938 - [`slice::rchunks`]
4939 - [`slice::rchunks_mut`]
4940 - [`slice::rchunks_exact`]
4941 - [`slice::rchunks_exact_mut`]
4942 - [`Option::replace`]
4946 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4947 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4948 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4950 [52813]: https://github.com/rust-lang/rust/pull/52813/
4951 [53218]: https://github.com/rust-lang/rust/pull/53218/
4952 [54057]: https://github.com/rust-lang/rust/pull/54057/
4953 [54240]: https://github.com/rust-lang/rust/pull/54240/
4954 [54430]: https://github.com/rust-lang/rust/pull/54430/
4955 [54451]: https://github.com/rust-lang/rust/pull/54451/
4956 [54497]: https://github.com/rust-lang/rust/pull/54497/
4957 [54778]: https://github.com/rust-lang/rust/pull/54778/
4958 [54835]: https://github.com/rust-lang/rust/pull/54835/
4959 [54870]: https://github.com/rust-lang/rust/pull/54870/
4960 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4961 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4962 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4963 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4964 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4965 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4966 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4967 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4968 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4969 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4970 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4971 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4972 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4973 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4975 Version 1.30.1 (2018-11-08)
4976 ===========================
4978 - [Fixed overflow ICE in rustdoc][54199]
4979 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4981 [54199]: https://github.com/rust-lang/rust/pull/54199
4982 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4984 Version 1.30.0 (2018-10-25)
4985 ==========================
4989 - [Procedural macros are now available.][52081] These kinds of macros allow for
4990 more powerful code generation. There is a [new chapter available][proc-macros]
4991 in the Rust Programming Language book that goes further in depth.
4992 - [You can now use keywords as identifiers using the raw identifiers
4993 syntax (`r#`),][53236] e.g. `let r#for = true;`
4994 - [Using anonymous parameters in traits is now deprecated with a warning and
4995 will be a hard error in the 2018 edition.][53272]
4996 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4997 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4998 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4999 Previously, using a external crate in a module without a use statement
5000 required `let json = ::serde_json::from_str(foo);` but can now be written
5001 as `let json = serde_json::from_str(foo);`.
5002 - [You can now apply the `#[used]` attribute to static items to prevent the
5003 compiler from optimising them away, even if they appear to be unused,][51363]
5004 e.g. `#[used] static FOO: u32 = 1;`
5005 - [You can now import and reexport macros from other crates with the `use`
5006 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5007 the root module of the crate. If your macro relies on calling other local
5008 macros, it is recommended to export with the
5009 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5011 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5012 using the `vis` specifier.][53370]
5013 - [Non-macro attributes now allow all forms of literals, not just
5014 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5015 write `#[attr(true)]`.
5016 - [You can now specify a function to handle a panic in the Rust runtime with the
5017 `#[panic_handler]` attribute.][51366]
5021 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5022 - [Added the `aarch64-unknown-netbsd` target][53165]
5023 - [Upgraded to LLVM 8.][53611]
5027 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5031 - [`Ipv4Addr::BROADCAST`]
5032 - [`Ipv4Addr::LOCALHOST`]
5033 - [`Ipv4Addr::UNSPECIFIED`]
5034 - [`Ipv6Addr::LOCALHOST`]
5035 - [`Ipv6Addr::UNSPECIFIED`]
5036 - [`Iterator::find_map`]
5038 The following methods are replacement methods for `trim_left`, `trim_right`,
5039 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5041 - [`str::trim_end_matches`]
5043 - [`str::trim_start_matches`]
5044 - [`str::trim_start`]
5048 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5049 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5050 equivalent to calling `rustdoc --error-format=json`.
5051 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5055 - [`rustdoc` allows you to specify what edition to treat your code as with the
5056 `--edition` option.][54057]
5057 - [`rustdoc` now has the `--color` (specify whether to output color) and
5058 `--error-format` (specify error format, e.g. `json`) options.][53003]
5059 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5060 debug symbols.][53774]
5061 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5062 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5064 [50911]: https://github.com/rust-lang/rust/pull/50911/
5065 [51363]: https://github.com/rust-lang/rust/pull/51363/
5066 [51366]: https://github.com/rust-lang/rust/pull/51366/
5067 [52081]: https://github.com/rust-lang/rust/pull/52081/
5068 [53003]: https://github.com/rust-lang/rust/pull/53003/
5069 [53033]: https://github.com/rust-lang/rust/pull/53033/
5070 [53044]: https://github.com/rust-lang/rust/pull/53044/
5071 [53165]: https://github.com/rust-lang/rust/pull/53165/
5072 [53611]: https://github.com/rust-lang/rust/pull/53611/
5073 [53236]: https://github.com/rust-lang/rust/pull/53236/
5074 [53272]: https://github.com/rust-lang/rust/pull/53272/
5075 [53370]: https://github.com/rust-lang/rust/pull/53370/
5076 [53459]: https://github.com/rust-lang/rust/pull/53459/
5077 [53774]: https://github.com/rust-lang/rust/pull/53774/
5078 [53822]: https://github.com/rust-lang/rust/pull/53822/
5079 [54057]: https://github.com/rust-lang/rust/pull/54057/
5080 [54404]: https://github.com/rust-lang/rust/pull/54404/
5081 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5082 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5083 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5084 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5086 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5087 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5088 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5089 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5090 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5091 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5092 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5093 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5094 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5095 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5098 Version 1.29.2 (2018-10-11)
5099 ===========================
5101 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5102 - The `rls-preview` component on the windows-gnu targets has been restored.
5104 [54639]: https://github.com/rust-lang/rust/pull/54639
5107 Version 1.29.1 (2018-09-25)
5108 ===========================
5113 - The standard library's `str::repeat` function contained an out of bounds write
5114 caused by an integer overflow. This has been fixed by deterministically
5115 panicking when an overflow happens.
5117 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5121 Version 1.29.0 (2018-09-13)
5122 ==========================
5126 - [Bumped minimum LLVM version to 5.0.][51899]
5127 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5128 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5129 - [Upgraded to LLVM 7.][51966]
5133 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5134 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5135 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5136 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5138 - [`Cell<T>` now allows `T` to be unsized.][50494]
5139 - [`SocketAddr` is now stable on Redox.][52656]
5144 - [`Iterator::flatten`]
5149 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5150 `--locked` to disable this behavior.
5151 - [`cargo-install` will now allow you to cross compile an install
5152 using `--target`.][cargo/5614]
5153 - [Added the `cargo-fix` subcommand to automatically move project code from
5154 2015 edition to 2018.][cargo/5723]
5155 - [`cargo doc` can now optionally document private types using the
5156 `--document-private-items` flag.][cargo/5543]
5160 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5161 the specified level to that level.][52354] For example `--cap-lints warn`
5162 will demote `deny` and `forbid` lints to `warn`.
5163 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5164 fails and `101` if there is a panic.][52197]
5165 - [A preview of clippy has been made available through rustup.][51122]
5166 You can install the preview with `rustup component add clippy-preview`.
5170 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5171 Use `str::get_unchecked(begin..end)` instead.
5172 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5173 Consider using the `home_dir` function from
5174 https://crates.io/crates/dirs instead.
5175 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5176 - [`cfg` attributes and `--cfg` command line flags are now more
5177 strictly validated.][53893]
5179 [53893]: https://github.com/rust-lang/rust/pull/53893/
5180 [52861]: https://github.com/rust-lang/rust/pull/52861/
5181 [51966]: https://github.com/rust-lang/rust/pull/51966/
5182 [52656]: https://github.com/rust-lang/rust/pull/52656/
5183 [52239]: https://github.com/rust-lang/rust/pull/52239/
5184 [52330]: https://github.com/rust-lang/rust/pull/52330/
5185 [52354]: https://github.com/rust-lang/rust/pull/52354/
5186 [52402]: https://github.com/rust-lang/rust/pull/52402/
5187 [52197]: https://github.com/rust-lang/rust/pull/52197/
5188 [51807]: https://github.com/rust-lang/rust/pull/51807/
5189 [51899]: https://github.com/rust-lang/rust/pull/51899/
5190 [51912]: https://github.com/rust-lang/rust/pull/51912/
5191 [51619]: https://github.com/rust-lang/rust/pull/51619/
5192 [51656]: https://github.com/rust-lang/rust/pull/51656/
5193 [51178]: https://github.com/rust-lang/rust/pull/51178/
5194 [51122]: https://github.com/rust-lang/rust/pull/51122
5195 [50494]: https://github.com/rust-lang/rust/pull/50494/
5196 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5197 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5198 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5199 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5200 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5201 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5202 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5205 Version 1.28.0 (2018-08-02)
5206 ===========================
5210 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5211 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5212 the inner type across Foreign Function Interface (FFI) boundaries.
5213 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5214 and can now be used as identifiers.][51196]
5215 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5216 stable.][51241] This will allow users to specify a global allocator for
5218 - [Unit test functions marked with the `#[test]` attribute can now return
5219 `Result<(), E: Debug>` in addition to `()`.][51298]
5220 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5221 allows macros to easily target lifetimes.
5225 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5226 prioritise making smaller binary sizes. `z` is the same as `s` with the
5227 exception that it does not vectorise loops, which typically results in an even
5229 - [The short error format is now stable.][49546] Specified with
5230 `--error-format=short` this option will provide a more compressed output of
5231 rust error messages.
5232 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5233 - [Reduced the number of allocations in the macro parser.][50855] This can
5234 improve compile times of macro heavy crates on average by 5%.
5238 - [Implemented `Default` for `&mut str`.][51306]
5239 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5240 - [Implemented `Extend` for `()`.][50234]
5241 - [The `Debug` implementation of `time::Duration` should now be more easily
5242 human readable.][50364] Previously a `Duration` of one second would printed as
5243 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5244 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5245 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5246 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5247 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5248 for `PathBuf`.][50170]
5249 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5250 and `Wrapping<i128>`.][50465]
5251 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5252 possible.][51050] This can provide up to a 40% speed increase.
5253 - [Improved error messages when using `format!`.][50610]
5257 - [`Iterator::step_by`]
5258 - [`Path::ancestors`]
5259 - [`SystemTime::UNIX_EPOCH`]
5260 - [`alloc::GlobalAlloc`]
5262 - [`alloc::LayoutErr`]
5265 - [`alloc::alloc_zeroed`]
5266 - [`alloc::dealloc`]
5267 - [`alloc::realloc`]
5268 - [`alloc::handle_alloc_error`]
5269 - [`btree_map::Entry::or_default`]
5270 - [`fmt::Alignment`]
5271 - [`hash_map::Entry::or_default`]
5272 - [`iter::repeat_with`]
5273 - [`num::NonZeroUsize`]
5274 - [`num::NonZeroU128`]
5275 - [`num::NonZeroU16`]
5276 - [`num::NonZeroU32`]
5277 - [`num::NonZeroU64`]
5278 - [`num::NonZeroU8`]
5279 - [`ops::RangeBounds`]
5280 - [`slice::SliceIndex`]
5281 - [`slice::from_mut`]
5282 - [`slice::from_ref`]
5283 - [`{Any + Send + Sync}::downcast_mut`]
5284 - [`{Any + Send + Sync}::downcast_ref`]
5285 - [`{Any + Send + Sync}::is`]
5289 - [Cargo will now no longer allow you to publish crates with build scripts that
5290 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5291 considered to be immutable.
5295 - [The `suggestion_applicability` field in `rustc`'s json output is now
5296 stable.][50486] This will allow dev tools to check whether a code suggestion
5297 would apply to them.
5301 - [Rust will consider trait objects with duplicated constraints to be the same
5302 type as without the duplicated constraint.][51276] For example the below code will
5303 now fail to compile.
5308 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5311 impl Trait + Send + Send {
5312 fn test(&self) { println!("two"); }
5316 [49546]: https://github.com/rust-lang/rust/pull/49546/
5317 [50143]: https://github.com/rust-lang/rust/pull/50143/
5318 [50170]: https://github.com/rust-lang/rust/pull/50170/
5319 [50234]: https://github.com/rust-lang/rust/pull/50234/
5320 [50265]: https://github.com/rust-lang/rust/pull/50265/
5321 [50364]: https://github.com/rust-lang/rust/pull/50364/
5322 [50385]: https://github.com/rust-lang/rust/pull/50385/
5323 [50465]: https://github.com/rust-lang/rust/pull/50465/
5324 [50486]: https://github.com/rust-lang/rust/pull/50486/
5325 [50554]: https://github.com/rust-lang/rust/pull/50554/
5326 [50610]: https://github.com/rust-lang/rust/pull/50610/
5327 [50855]: https://github.com/rust-lang/rust/pull/50855/
5328 [51050]: https://github.com/rust-lang/rust/pull/51050/
5329 [51196]: https://github.com/rust-lang/rust/pull/51196/
5330 [51241]: https://github.com/rust-lang/rust/pull/51241/
5331 [51276]: https://github.com/rust-lang/rust/pull/51276/
5332 [51298]: https://github.com/rust-lang/rust/pull/51298/
5333 [51306]: https://github.com/rust-lang/rust/pull/51306/
5334 [51562]: https://github.com/rust-lang/rust/pull/51562/
5335 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5336 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5337 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5338 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5339 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5340 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5341 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5342 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5343 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5344 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5345 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5346 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5347 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5348 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5349 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5350 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5351 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5352 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5353 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5354 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5355 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5356 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5357 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5358 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5359 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5360 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5361 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5362 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5363 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5364 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5366 Version 1.27.2 (2018-07-20)
5367 ===========================
5372 - The borrow checker was fixed to avoid potential unsoundness when using
5373 match ergonomics: [#52213][52213].
5375 [52213]: https://github.com/rust-lang/rust/issues/52213
5377 Version 1.27.1 (2018-07-10)
5378 ===========================
5383 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5384 when running, which enabled executing code as some other user on a
5385 given machine. This release fixes that vulnerability; you can read
5386 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5388 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5393 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5394 match ergonomics: [#51415][51415], [#49534][49534].
5396 [51415]: https://github.com/rust-lang/rust/issues/51415
5397 [49534]: https://github.com/rust-lang/rust/issues/49534
5398 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5399 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5401 Version 1.27.0 (2018-06-21)
5402 ==========================
5406 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5407 be used as an identifier.
5408 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5409 bare `Trait` syntax, and should make it clearer when being used in tandem with
5410 `impl Trait` because it is equivalent to the following syntax:
5411 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5412 `Box<Trait> == Box<dyn Trait>`.
5413 - [Attributes on generic parameters such as types and lifetimes are
5414 now stable.][48851] e.g.
5415 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5416 - [The `#[must_use]` attribute can now also be used on functions as well as
5417 types.][48925] It provides a lint that by default warns users when the
5418 value returned by a function has not been used.
5422 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5426 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5427 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5428 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5429 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5430 the `cfg` attribute.
5431 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5432 std are now available in core.][49896]
5433 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5435 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5436 that the operation isn't done in place.
5437 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5438 the `#[must_use]` attribute][49533] to warn about unused potentially
5439 expensive allocations.
5443 - [`DoubleEndedIterator::rfind`]
5444 - [`DoubleEndedIterator::rfold`]
5445 - [`DoubleEndedIterator::try_rfold`]
5446 - [`Duration::from_micros`]
5447 - [`Duration::from_nanos`]
5448 - [`Duration::subsec_micros`]
5449 - [`Duration::subsec_millis`]
5450 - [`HashMap::remove_entry`]
5451 - [`Iterator::try_fold`]
5452 - [`Iterator::try_for_each`]
5454 - [`Option::filter`]
5455 - [`String::replace_range`]
5456 - [`Take::set_limit`]
5457 - [`hint::unreachable_unchecked`]
5458 - [`os::unix::process::parent_id`]
5459 - [`ptr::swap_nonoverlapping`]
5460 - [`slice::rsplit_mut`]
5462 - [`slice::swap_with_slice`]
5466 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5467 `readme`, and `repository` fields.][cargo/5386]
5468 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5469 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5470 a different directory than `target` for placing compilation artifacts.
5471 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5472 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5473 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5474 where cargo would infer a binary, Cargo will produce a warning. You can
5475 disable this feature ahead of time by setting any of the following to false:
5476 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5477 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5478 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5482 - [Added “The Rustc book” into the official documentation.][49707]
5483 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5484 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5488 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5489 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5490 compile, `"".is_empty()` will still compile.
5491 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5492 will only print the inner type.][48553] E.g.
5493 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5494 not `AtomicBool(true)`.
5495 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5496 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5497 alignment should cover all use cases.
5498 - The `.description()` method on the `std::error::Error` trait
5499 [has been soft-deprecated][50163]. It is no longer required to implement it.
5501 [48553]: https://github.com/rust-lang/rust/pull/48553/
5502 [48851]: https://github.com/rust-lang/rust/pull/48851/
5503 [48925]: https://github.com/rust-lang/rust/pull/48925/
5504 [49533]: https://github.com/rust-lang/rust/pull/49533/
5505 [49623]: https://github.com/rust-lang/rust/pull/49623/
5506 [49630]: https://github.com/rust-lang/rust/pull/49630/
5507 [49664]: https://github.com/rust-lang/rust/pull/49664/
5508 [49699]: https://github.com/rust-lang/rust/pull/49699/
5509 [49707]: https://github.com/rust-lang/rust/pull/49707/
5510 [49896]: https://github.com/rust-lang/rust/pull/49896/
5511 [49968]: https://github.com/rust-lang/rust/pull/49968/
5512 [50163]: https://github.com/rust-lang/rust/pull/50163
5513 [50177]: https://github.com/rust-lang/rust/pull/50177/
5514 [50378]: https://github.com/rust-lang/rust/pull/50378/
5515 [50423]: https://github.com/rust-lang/rust/pull/50423/
5516 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5517 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5518 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5519 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5520 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5521 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5522 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5523 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5524 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5525 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5526 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5527 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5528 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5529 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5530 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5531 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5532 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5533 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5534 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5535 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5536 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5537 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5538 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5539 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5540 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5541 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5542 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5543 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5544 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5547 Version 1.26.2 (2018-06-05)
5548 ==========================
5553 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5555 [51117]: https://github.com/rust-lang/rust/issues/51117
5558 Version 1.26.1 (2018-05-29)
5559 ==========================
5564 - [RLS now works on Windows.][50646]
5565 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5571 - [`fn main() -> impl Trait` no longer works for non-Termination
5573 This reverts an accidental stabilization.
5574 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5575 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5577 [50646]: https://github.com/rust-lang/rust/issues/50646
5578 [50656]: https://github.com/rust-lang/rust/pull/50656
5579 [50812]: https://github.com/rust-lang/rust/pull/50812
5580 [50950]: https://github.com/rust-lang/rust/issues/50950
5581 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5583 Version 1.26.0 (2018-05-10)
5584 ==========================
5588 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5589 implement either or both traits.][49299]
5590 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5591 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5592 lifetime can be elided.][49458]
5593 - [`impl Trait` is now stable allowing you to have abstract types in returns
5594 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5595 `fn open(path: impl AsRef<Path>)`.
5596 - [Pattern matching will now automatically apply dereferences.][49394]
5597 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5598 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5599 - [A lot of operations are now available in a const context.][46882] E.g. You
5600 can now index into constant arrays, reference and dereference into constants,
5601 and use tuple struct constructors.
5602 - [Fixed entry slice patterns are now stable.][48516] E.g.
5604 let points = [1, 2, 3, 4];
5606 [1, 2, 3, 4] => println!("All points were sequential."),
5607 _ => println!("Not all points were sequential."),
5614 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5615 - [Fixed exponential projection complexity on nested types.][48296]
5616 This can provide up to a ~12% reduction in compile times for certain crates.
5617 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5618 to remap path prefixes outputted by the compiler.
5619 - [Added `powerpc-unknown-netbsd` target.][48281]
5623 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5624 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5625 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5626 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5627 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5628 - [`ascii::escape_default` is now available in libcore.][48735]
5629 - [Trailing commas are now supported in std and core macros.][48056]
5630 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5631 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5636 - [`*const T::copy_to_nonoverlapping`]
5637 - [`*const T::copy_to`]
5638 - [`*const T::read_unaligned`]
5639 - [`*const T::read_volatile`]
5640 - [`*const T::read`]
5642 - [`*const T::wrapping_add`]
5643 - [`*const T::wrapping_sub`]
5645 - [`*mut T::copy_to_nonoverlapping`]
5646 - [`*mut T::copy_to`]
5647 - [`*mut T::read_unaligned`]
5648 - [`*mut T::read_volatile`]
5650 - [`*mut T::replace`]
5653 - [`*mut T::wrapping_add`]
5654 - [`*mut T::wrapping_sub`]
5655 - [`*mut T::write_bytes`]
5656 - [`*mut T::write_unaligned`]
5657 - [`*mut T::write_volatile`]
5660 - [`FromUtf8Error::as_bytes`]
5661 - [`LocalKey::try_with`]
5662 - [`Option::cloned`]
5663 - [`btree_map::Entry::and_modify`]
5664 - [`fs::read_to_string`]
5667 - [`hash_map::Entry::and_modify`]
5668 - [`iter::FusedIterator`]
5669 - [`ops::RangeInclusive`]
5670 - [`ops::RangeToInclusive`]
5672 - [`slice::rotate_left`]
5673 - [`slice::rotate_right`]
5674 - [`String::retain`]
5679 - [Cargo will now output path to custom commands when `-v` is
5680 passed with `--list`][cargo/5041]
5681 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5685 - [The second edition of "The Rust Programming Language" book is now recommended
5686 over the first.][48404]
5691 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5692 syntax is now invalid.
5694 use std::ops::Fn as dyn;
5695 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5697 - [The result of dereferences are no longer promoted to `'static`.][47408]
5701 const PAIR: &(i32, i32) = &(0, 1);
5702 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5705 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5706 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5708 - [Removed hoedown from rustdoc.][48274]
5709 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5711 [46882]: https://github.com/rust-lang/rust/pull/46882
5712 [47379]: https://github.com/rust-lang/rust/pull/47379
5713 [47408]: https://github.com/rust-lang/rust/pull/47408
5714 [47813]: https://github.com/rust-lang/rust/pull/47813
5715 [48056]: https://github.com/rust-lang/rust/pull/48056
5716 [48125]: https://github.com/rust-lang/rust/pull/48125
5717 [48235]: https://github.com/rust-lang/rust/pull/48235
5718 [48274]: https://github.com/rust-lang/rust/pull/48274
5719 [48281]: https://github.com/rust-lang/rust/pull/48281
5720 [48296]: https://github.com/rust-lang/rust/pull/48296
5721 [48326]: https://github.com/rust-lang/rust/pull/48326
5722 [48359]: https://github.com/rust-lang/rust/pull/48359
5723 [48404]: https://github.com/rust-lang/rust/pull/48404
5724 [48481]: https://github.com/rust-lang/rust/pull/48481
5725 [48516]: https://github.com/rust-lang/rust/pull/48516
5726 [48628]: https://github.com/rust-lang/rust/pull/48628
5727 [48629]: https://github.com/rust-lang/rust/pull/48629
5728 [48657]: https://github.com/rust-lang/rust/pull/48657
5729 [48735]: https://github.com/rust-lang/rust/pull/48735
5730 [48978]: https://github.com/rust-lang/rust/pull/48978
5731 [49101]: https://github.com/rust-lang/rust/pull/49101
5732 [49109]: https://github.com/rust-lang/rust/pull/49109
5733 [49162]: https://github.com/rust-lang/rust/pull/49162
5734 [49255]: https://github.com/rust-lang/rust/pull/49255
5735 [49299]: https://github.com/rust-lang/rust/pull/49299
5736 [49305]: https://github.com/rust-lang/rust/pull/49305
5737 [49394]: https://github.com/rust-lang/rust/pull/49394
5738 [49458]: https://github.com/rust-lang/rust/pull/49458
5739 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5740 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5741 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5742 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5743 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5744 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5745 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5746 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5747 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5748 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5749 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5750 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5751 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5752 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5753 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5754 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5755 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5756 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5757 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5758 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5759 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5760 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5761 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5762 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5763 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5764 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5765 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5766 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5767 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5768 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5769 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5770 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5771 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5772 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5773 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5774 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5775 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5776 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5777 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5778 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5779 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5780 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5783 Version 1.25.0 (2018-03-29)
5784 ==========================
5788 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5789 - [You can now use nested groups of imports.][47948]
5790 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5791 - [You can now have `|` at the start of a match arm.][47947] e.g.
5793 enum Foo { A, B, C }
5799 | Foo::B => println!("AB"),
5800 | Foo::C => println!("C"),
5807 - [Upgraded to LLVM 6.][47828]
5808 - [Added `-C lto=val` option.][47521]
5809 - [Added `i586-unknown-linux-musl` target][47282]
5813 - [Impl Send for `process::Command` on Unix.][47760]
5814 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5815 - [`UnsafeCell::into_inner` is now safe.][47204]
5816 - [Implement libstd for CloudABI.][47268]
5817 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5818 - [Implement `AsRef<Path>` for Component][46985]
5819 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5820 - [Moved `Duration` to libcore.][46666]
5824 - [`Location::column`]
5827 The following functions can now be used in a constant expression.
5828 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5829 - [`Duration::new`][47300]
5830 - [`Duration::from_secs`][47300]
5831 - [`Duration::from_millis`][47300]
5835 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5836 - [`cargo new` now defaults to creating a binary crate, instead of a
5837 library crate.][cargo/5029]
5841 - [Rust by example is now shipped with new releases][46196]
5845 - [Deprecated `net::lookup_host`.][47510]
5846 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5847 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5848 around indexing operations (see [#47349][47349]). This has been fixed (which also
5849 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5850 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5852 [33903]: https://github.com/rust-lang/rust/pull/33903
5853 [47947]: https://github.com/rust-lang/rust/pull/47947
5854 [47948]: https://github.com/rust-lang/rust/pull/47948
5855 [47760]: https://github.com/rust-lang/rust/pull/47760
5856 [47790]: https://github.com/rust-lang/rust/pull/47790
5857 [47828]: https://github.com/rust-lang/rust/pull/47828
5858 [47398]: https://github.com/rust-lang/rust/pull/47398
5859 [47510]: https://github.com/rust-lang/rust/pull/47510
5860 [47521]: https://github.com/rust-lang/rust/pull/47521
5861 [47204]: https://github.com/rust-lang/rust/pull/47204
5862 [47251]: https://github.com/rust-lang/rust/pull/47251
5863 [47268]: https://github.com/rust-lang/rust/pull/47268
5864 [47282]: https://github.com/rust-lang/rust/pull/47282
5865 [47300]: https://github.com/rust-lang/rust/pull/47300
5866 [47349]: https://github.com/rust-lang/rust/pull/47349
5867 [46931]: https://github.com/rust-lang/rust/pull/46931
5868 [46985]: https://github.com/rust-lang/rust/pull/46985
5869 [47006]: https://github.com/rust-lang/rust/pull/47006
5870 [46830]: https://github.com/rust-lang/rust/pull/46830
5871 [46095]: https://github.com/rust-lang/rust/pull/46095
5872 [46666]: https://github.com/rust-lang/rust/pull/46666
5873 [46196]: https://github.com/rust-lang/rust/pull/46196
5874 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5875 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5876 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5877 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5878 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5881 Version 1.24.1 (2018-03-01)
5882 ==========================
5884 - [Do not abort when unwinding through FFI][48251]
5885 - [Emit UTF-16 files for linker arguments on Windows][48318]
5886 - [Make the error index generator work again][48308]
5887 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5889 [48251]: https://github.com/rust-lang/rust/issues/48251
5890 [48308]: https://github.com/rust-lang/rust/issues/48308
5891 [48318]: https://github.com/rust-lang/rust/issues/48318
5892 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5895 Version 1.24.0 (2018-02-15)
5896 ==========================
5900 - [External `sysv64` ffi is now available.][46528]
5901 eg. `extern "sysv64" fn foo () {}`
5905 - [rustc now uses 16 codegen units by default for release builds.][46910]
5906 For the fastest builds, utilize `codegen-units=1`.
5907 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5908 - [Add `aarch64-unknown-openbsd` support][46760]
5912 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5913 improvement in performance in the majority of cases.
5914 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5915 with Windows.][46798]
5916 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5917 - [impl `From<bool>` for `AtomicBool`][46293]
5918 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5919 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5920 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5921 - [float::from_bits now just uses transmute.][46012] This provides
5922 some optimisations from LLVM.
5923 - [Copied `AsciiExt` methods onto `char`][46077]
5924 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5925 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5926 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5927 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5931 - [`RefCell::replace`]
5933 - [`atomic::spin_loop_hint`]
5935 The following functions can now be used in a constant expression.
5936 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5938 - [`AtomicBool::new`][46287]
5939 - [`AtomicUsize::new`][46287]
5940 - [`AtomicIsize::new`][46287]
5941 - [`AtomicPtr::new`][46287]
5942 - [`Cell::new`][46287]
5943 - [`{integer}::min_value`][46287]
5944 - [`{integer}::max_value`][46287]
5945 - [`mem::size_of`][46287]
5946 - [`mem::align_of`][46287]
5947 - [`ptr::null`][46287]
5948 - [`ptr::null_mut`][46287]
5949 - [`RefCell::new`][46287]
5950 - [`UnsafeCell::new`][46287]
5954 - [Added a `workspace.default-members` config that
5955 overrides implied `--all` in virtual workspaces.][cargo/4743]
5956 - [Enable incremental by default on development builds.][cargo/4817] Also added
5957 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5958 per-project or global basis respectively.
5965 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5966 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5967 in accordance with IETF RFC 4291 §2.2.
5968 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5969 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5970 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5971 - [Leading zeros in tuple struct members is now an error][47084]
5972 - [`column!()` macro is one-based instead of zero-based][46977]
5973 - [`fmt::Arguments` can no longer be shared across threads][45198]
5974 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5975 - [Cargo sets a different working directory for the compiler][cargo/4788]
5977 [44884]: https://github.com/rust-lang/rust/pull/44884
5978 [45198]: https://github.com/rust-lang/rust/pull/45198
5979 [45506]: https://github.com/rust-lang/rust/pull/45506
5980 [45990]: https://github.com/rust-lang/rust/pull/45990
5981 [46012]: https://github.com/rust-lang/rust/pull/46012
5982 [46077]: https://github.com/rust-lang/rust/pull/46077
5983 [46094]: https://github.com/rust-lang/rust/pull/46094
5984 [46284]: https://github.com/rust-lang/rust/pull/46284
5985 [46287]: https://github.com/rust-lang/rust/pull/46287
5986 [46293]: https://github.com/rust-lang/rust/pull/46293
5987 [46528]: https://github.com/rust-lang/rust/pull/46528
5988 [46671]: https://github.com/rust-lang/rust/pull/46671
5989 [46713]: https://github.com/rust-lang/rust/pull/46713
5990 [46735]: https://github.com/rust-lang/rust/pull/46735
5991 [46760]: https://github.com/rust-lang/rust/pull/46760
5992 [46798]: https://github.com/rust-lang/rust/pull/46798
5993 [46828]: https://github.com/rust-lang/rust/pull/46828
5994 [46831]: https://github.com/rust-lang/rust/pull/46831
5995 [46833]: https://github.com/rust-lang/rust/pull/46833
5996 [46910]: https://github.com/rust-lang/rust/pull/46910
5997 [46977]: https://github.com/rust-lang/rust/pull/46977
5998 [47018]: https://github.com/rust-lang/rust/pull/47018
5999 [47080]: https://github.com/rust-lang/rust/pull/47080
6000 [47084]: https://github.com/rust-lang/rust/pull/47084
6001 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6002 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6003 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6004 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6005 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6006 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6009 Version 1.23.0 (2018-01-04)
6010 ==========================
6014 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6015 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6016 Which should fix some confusing errors in some operations.
6020 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6021 undefined behavior.][45920]
6022 - [rustc now suggests renaming import if names clash.][45660]
6023 - [Display errors/warnings correctly when there are zero-width or
6024 wide characters.][45711]
6025 - [rustc now avoids unnecessary copies of arguments that are
6026 simple bindings][45380] This should improve memory usage on average by 5-10%.
6027 - [Updated musl used to build musl rustc to 1.1.17][45393]
6031 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6032 - [Implement Hash for raw pointers to unsized types][45483]
6033 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6034 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6035 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6036 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6037 and `<*mut T>::as_mut`][44932]
6038 - [Optimized `Thread::{park, unpark}` implementation][45524]
6039 - [Improved `SliceExt::binary_search` performance.][45333]
6040 - [impl `FromIterator<()>` for `()`][45379]
6041 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6049 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6050 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6051 - [Added unit test checking to `cargo check`][cargo/4592]
6052 - [Cargo now lets you install a specific version
6053 using `cargo install --version`][cargo/4637]
6057 - [Releases now ship with the Cargo book documentation.][45692]
6058 - [rustdoc now prints rendering warnings on every run.][45324]
6062 - [Changes have been made to type equality to make it more correct,
6063 in rare cases this could break some code.][45853] [Tracking issue for
6064 further information][45852]
6065 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6066 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6067 Android 9, the minimum supported version is Android 14.
6068 - [Bumped the minimum LLVM to 3.9][45326]
6070 [44042]: https://github.com/rust-lang/rust/pull/44042
6071 [44932]: https://github.com/rust-lang/rust/pull/44932
6072 [45267]: https://github.com/rust-lang/rust/pull/45267
6073 [45324]: https://github.com/rust-lang/rust/pull/45324
6074 [45326]: https://github.com/rust-lang/rust/pull/45326
6075 [45333]: https://github.com/rust-lang/rust/pull/45333
6076 [45379]: https://github.com/rust-lang/rust/pull/45379
6077 [45380]: https://github.com/rust-lang/rust/pull/45380
6078 [45393]: https://github.com/rust-lang/rust/pull/45393
6079 [45435]: https://github.com/rust-lang/rust/pull/45435
6080 [45483]: https://github.com/rust-lang/rust/pull/45483
6081 [45524]: https://github.com/rust-lang/rust/pull/45524
6082 [45571]: https://github.com/rust-lang/rust/pull/45571
6083 [45580]: https://github.com/rust-lang/rust/pull/45580
6084 [45610]: https://github.com/rust-lang/rust/pull/45610
6085 [45660]: https://github.com/rust-lang/rust/pull/45660
6086 [45692]: https://github.com/rust-lang/rust/pull/45692
6087 [45711]: https://github.com/rust-lang/rust/pull/45711
6088 [45772]: https://github.com/rust-lang/rust/pull/45772
6089 [45852]: https://github.com/rust-lang/rust/issues/45852
6090 [45853]: https://github.com/rust-lang/rust/pull/45853
6091 [45887]: https://github.com/rust-lang/rust/pull/45887
6092 [45920]: https://github.com/rust-lang/rust/pull/45920
6093 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6094 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6095 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6098 Version 1.22.1 (2017-11-22)
6099 ==========================
6101 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6103 [46183]: https://github.com/rust-lang/rust/pull/46183
6105 Version 1.22.0 (2017-11-22)
6106 ==========================
6110 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6111 - [Now accepts underscores in unicode escapes][43716]
6112 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6113 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6117 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6118 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6119 This should decrease compile times for debug builds.
6120 - [strict memory alignment now enabled on ARMv6][45094]
6121 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6125 - [Allow atomic operations up to 32 bits
6126 on `armv5te_unknown_linux_gnueabi`][44978]
6127 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6128 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6129 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6130 - [Properly detect overflow in `Instant += Duration`.][44220]
6131 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6132 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6133 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6140 - [Cargo will now build multi file examples in subdirectories of the `examples`
6141 folder that have a `main.rs` file.][cargo/4496]
6142 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6143 the old format will continue to work and can be updated with `cargo update`.
6144 - [Now supports vendoring git repositories][cargo/3992]
6148 - [`libbacktrace` is now available on Apple platforms.][44251]
6149 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6150 This now lets you specify that a given code example will fail to compile.
6154 - [The minimum Android version that rustc can build for has been bumped
6155 to `4.0` from `2.3`][45656]
6156 - [Allowing `T op= &T` for numeric types has broken some type
6157 inference cases][45480]
6160 [42526]: https://github.com/rust-lang/rust/pull/42526
6161 [43716]: https://github.com/rust-lang/rust/pull/43716
6162 [43949]: https://github.com/rust-lang/rust/pull/43949
6163 [44015]: https://github.com/rust-lang/rust/pull/44015
6164 [44220]: https://github.com/rust-lang/rust/pull/44220
6165 [44251]: https://github.com/rust-lang/rust/pull/44251
6166 [44287]: https://github.com/rust-lang/rust/pull/44287
6167 [44303]: https://github.com/rust-lang/rust/pull/44303
6168 [44456]: https://github.com/rust-lang/rust/pull/44456
6169 [44466]: https://github.com/rust-lang/rust/pull/44466
6170 [44895]: https://github.com/rust-lang/rust/pull/44895
6171 [44966]: https://github.com/rust-lang/rust/pull/44966
6172 [44978]: https://github.com/rust-lang/rust/pull/44978
6173 [45041]: https://github.com/rust-lang/rust/pull/45041
6174 [45064]: https://github.com/rust-lang/rust/pull/45064
6175 [45075]: https://github.com/rust-lang/rust/pull/45075
6176 [45094]: https://github.com/rust-lang/rust/pull/45094
6177 [45095]: https://github.com/rust-lang/rust/pull/45095
6178 [45480]: https://github.com/rust-lang/rust/issues/45480
6179 [45656]: https://github.com/rust-lang/rust/pull/45656
6180 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6181 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6182 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6189 Version 1.21.0 (2017-10-12)
6190 ==========================
6194 - [You can now use static references for literals.][43838]
6198 let x: &'static u32 = &0;
6201 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6204 my_macro!(Vec<i32>::new); // Always worked
6205 my_macro!(Vec::<i32>::new); // Now works
6210 - [Upgraded jemalloc to 4.5.0][43911]
6211 - [Enabled unwinding panics on Redox][43917]
6212 - [Now runs LLVM in parallel during translation phase.][43506]
6213 This should reduce peak memory usage.
6217 - [Generate builtin impls for `Clone` for all arrays and tuples that
6218 are `T: Clone`][43690]
6219 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6220 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6221 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6226 [`std::mem::discriminant`]
6230 - [You can now call `cargo install` with multiple package names][cargo/4216]
6231 - [Cargo commands inside a virtual workspace will now implicitly
6232 pass `--all`][cargo/4335]
6233 - [Added a `[patch]` section to `Cargo.toml` to handle
6234 prepublication dependencies][cargo/4123] [RFC 1969]
6235 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6236 like patterns][cargo/4270]
6237 - [Added the `--all-targets` option][cargo/4400]
6238 - [Using required dependencies as a feature is now deprecated and emits
6239 a warning][cargo/4364]
6244 - [Cargo docs are moving][43916]
6245 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6246 - [The rustdoc book is now available][43863]
6247 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6248 - [Added a preview of RLS has been made available through rustup][44204]
6249 Install with `rustup component add rls-preview`
6250 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6251 Previously only showed `std::os::unix`.
6255 - [Changes in method matching against higher-ranked types][43880] This may cause
6256 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6257 - [rustc's JSON error output's byte position start at top of file.][42973]
6258 Was previously relative to the rustc's internal `CodeMap` struct which
6259 required the unstable library `libsyntax` to correctly use.
6260 - [`unused_results` lint no longer ignores booleans][43728]
6262 [42565]: https://github.com/rust-lang/rust/pull/42565
6263 [42973]: https://github.com/rust-lang/rust/pull/42973
6264 [43348]: https://github.com/rust-lang/rust/pull/43348
6265 [43459]: https://github.com/rust-lang/rust/pull/43459
6266 [43506]: https://github.com/rust-lang/rust/pull/43506
6267 [43540]: https://github.com/rust-lang/rust/pull/43540
6268 [43690]: https://github.com/rust-lang/rust/pull/43690
6269 [43728]: https://github.com/rust-lang/rust/pull/43728
6270 [43838]: https://github.com/rust-lang/rust/pull/43838
6271 [43863]: https://github.com/rust-lang/rust/pull/43863
6272 [43880]: https://github.com/rust-lang/rust/pull/43880
6273 [43911]: https://github.com/rust-lang/rust/pull/43911
6274 [43916]: https://github.com/rust-lang/rust/pull/43916
6275 [43917]: https://github.com/rust-lang/rust/pull/43917
6276 [44204]: https://github.com/rust-lang/rust/pull/44204
6277 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6278 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6279 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6280 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6281 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6282 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6283 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6284 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6285 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6287 Version 1.20.0 (2017-08-31)
6288 ===========================
6292 - [Associated constants are now stabilised.][42809]
6293 - [A lot of macro bugs are now fixed.][42913]
6298 - [Struct fields are now properly coerced to the expected field type.][42807]
6299 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6300 `wasm32-experimental-emscripten` target.
6301 - [Changed some of the error messages to be more helpful.][42033]
6302 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6304 - [rustc now reports the total number of errors on compilation failure][43015]
6305 previously this was only the number of errors in the pass that failed.
6306 - [Expansion in rustc has been sped up 29x.][42533]
6307 - [added `msp430-none-elf` target.][43099]
6308 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6310 - [Fixes backtraces on Redox][43228]
6311 - [rustc now identifies different versions of same crate when absolute paths of
6312 different types match in an error message.][42826]
6318 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6319 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6321 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6322 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6323 - [Impl `Clone` for `DefaultHasher`.][42799]
6324 - [Impl `Sync` for `SyncSender`.][42397]
6325 - [Impl `FromStr` for `char`][42271]
6326 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6328 - [allow messages in the `unimplemented!()` macro.][42155]
6329 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6330 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6331 - [Upgrade to Unicode 10.0.0][42999]
6332 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6333 - [Skip the main thread's manual stack guard on Linux][43072]
6334 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6335 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6337 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6342 - [`CStr::into_c_string`]
6343 - [`CString::as_c_str`]
6344 - [`CString::into_boxed_c_str`]
6345 - [`Chain::get_mut`]
6346 - [`Chain::get_ref`]
6347 - [`Chain::into_inner`]
6348 - [`Option::get_or_insert_with`]
6349 - [`Option::get_or_insert`]
6350 - [`OsStr::into_os_string`]
6351 - [`OsString::into_boxed_os_str`]
6354 - [`Utf8Error::error_len`]
6355 - [`char::EscapeDebug`]
6356 - [`char::escape_debug`]
6357 - [`compile_error!`]
6358 - [`f32::from_bits`]
6360 - [`f64::from_bits`]
6362 - [`mem::ManuallyDrop`]
6363 - [`slice::sort_unstable_by_key`]
6364 - [`slice::sort_unstable_by`]
6365 - [`slice::sort_unstable`]
6366 - [`str::from_boxed_utf8_unchecked`]
6367 - [`str::as_bytes_mut`]
6368 - [`str::as_bytes_mut`]
6369 - [`str::from_utf8_mut`]
6370 - [`str::from_utf8_unchecked_mut`]
6372 - [`str::get_unchecked_mut`]
6373 - [`str::get_unchecked`]
6375 - [`str::into_boxed_bytes`]
6380 - [Cargo API token location moved from `~/.cargo/config` to
6381 `~/.cargo/credentials`.][cargo/3978]
6382 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6383 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6384 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6385 - [You can now specify version of a binary when installed through
6386 `cargo install` using `--vers`.][cargo/4229]
6387 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6388 failure.][cargo/4248]
6389 - [Changed the convention around which file is the crate root.][cargo/4259]
6394 - [Functions with `'static` in their return types will now not be as usable as
6395 if they were using lifetime parameters instead.][42417]
6396 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6397 takes the sign of NaN into account where previously didn't.][42430]
6399 [42033]: https://github.com/rust-lang/rust/pull/42033
6400 [42155]: https://github.com/rust-lang/rust/pull/42155
6401 [42271]: https://github.com/rust-lang/rust/pull/42271
6402 [42397]: https://github.com/rust-lang/rust/pull/42397
6403 [42417]: https://github.com/rust-lang/rust/pull/42417
6404 [42430]: https://github.com/rust-lang/rust/pull/42430
6405 [42431]: https://github.com/rust-lang/rust/pull/42431
6406 [42533]: https://github.com/rust-lang/rust/pull/42533
6407 [42571]: https://github.com/rust-lang/rust/pull/42571
6408 [42613]: https://github.com/rust-lang/rust/pull/42613
6409 [42799]: https://github.com/rust-lang/rust/pull/42799
6410 [42807]: https://github.com/rust-lang/rust/pull/42807
6411 [42809]: https://github.com/rust-lang/rust/pull/42809
6412 [42822]: https://github.com/rust-lang/rust/pull/42822
6413 [42826]: https://github.com/rust-lang/rust/pull/42826
6414 [42854]: https://github.com/rust-lang/rust/pull/42854
6415 [42913]: https://github.com/rust-lang/rust/pull/42913
6416 [42999]: https://github.com/rust-lang/rust/pull/42999
6417 [43011]: https://github.com/rust-lang/rust/pull/43011
6418 [43015]: https://github.com/rust-lang/rust/pull/43015
6419 [43072]: https://github.com/rust-lang/rust/pull/43072
6420 [43077]: https://github.com/rust-lang/rust/pull/43077
6421 [43097]: https://github.com/rust-lang/rust/pull/43097
6422 [43099]: https://github.com/rust-lang/rust/pull/43099
6423 [43170]: https://github.com/rust-lang/rust/pull/43170
6424 [43178]: https://github.com/rust-lang/rust/pull/43178
6425 [43185]: https://github.com/rust-lang/rust/pull/43185
6426 [43228]: https://github.com/rust-lang/rust/pull/43228
6427 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6428 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6429 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6430 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6431 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6432 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6433 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6434 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6435 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6436 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6437 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6438 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6439 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6440 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6441 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6442 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6443 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6444 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6445 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6446 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6447 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6448 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6449 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6450 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6451 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6452 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6453 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6454 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6455 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6456 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6457 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6458 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6459 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6460 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6461 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6462 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6463 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6464 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6467 Version 1.19.0 (2017-07-20)
6468 ===========================
6473 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6474 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6475 - [Macro recursion limit increased to 1024 from 64.][41676]
6476 - [Added lint for detecting unused macros.][41907]
6477 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6478 For example: `let x = loop { break 7; };`
6479 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6480 contain `Copy` types and cannot have a `Drop` implementation.
6481 Example: `union Foo { bar: u8, baz: usize }`
6482 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6483 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6488 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6489 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6490 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6491 you should use `--target armv7-linux-androideabi`.
6492 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6493 - [Minor optimisation of string operations.][42037]
6494 - [Compiler error message is now `aborting due to previous error(s)` instead of
6495 `aborting due to N previous errors`][42150] This was previously inaccurate and
6496 would only count certain kinds of errors.
6497 - [The compiler now supports Visual Studio 2017][42225]
6498 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6499 - [Added a lot][42264] of [new error codes][42302]
6500 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6501 libraries with C Run-time Libraries(CRT) to be statically linked.
6502 - [Fixed various ARM codegen bugs][42740]
6507 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6508 `Extend<Cow<'a, str>>`][41449]
6509 - [`Vec` now implements `From<&mut [T]>`][41530]
6510 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6511 - [`SplitWhitespace` now implements `Clone`][41659]
6512 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6514 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6515 macros, but for printing to stderr.
6520 - [`OsString::shrink_to_fit`]
6523 - [`thread::ThreadId`]
6528 - [Build scripts can now add environment variables to the environment
6529 the crate is being compiled in.
6530 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6531 - [Subcommands now replace the current process rather than spawning a new
6532 child process][cargo/3970]
6533 - [Workspace members can now accept glob file patterns][cargo/3979]
6534 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6535 the members in a given workspace.][cargo/3988]
6536 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6537 - [Target directory path is now in the cargo metadata][cargo/4022]
6538 - [Cargo no longer checks out a local working directory for the
6539 crates.io index][cargo/4026] This should provide smaller file size for the
6540 registry, and improve cloning times, especially on Windows machines.
6541 - [Added an `--exclude` option for excluding certain packages when using the
6542 `--all` option][cargo/4031]
6543 - [Cargo will now automatically retry when receiving a 5xx error
6544 from crates.io][cargo/4032]
6545 - [The `--features` option now accepts multiple comma or space
6546 delimited values.][cargo/4084]
6547 - [Added support for custom target specific runners][cargo/3954]
6552 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6554 - [Rust will now release XZ compressed packages][rust-installer/57]
6555 - [rustup will now prefer to download rust packages with
6556 XZ compression][rustup/1100] over GZip packages.
6557 - [Added the ability to escape `#` in rust documentation][41785] By adding
6558 additional `#`'s ie. `##` is now `#`
6563 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6564 - [`-Z` flags are now no longer allowed to be used on the stable
6565 compiler.][41751] This has been a warning for a year previous to this.
6566 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6567 longer works][42844]. Users should migrate to the built-in `check`
6568 command, which has been available since 1.16.
6569 - [Ending a float literal with `._` is now a hard error.
6570 Example: `42._` .][41946]
6571 - [Any use of a private `extern crate` outside of its module is now a
6572 hard error.][36886] This was previously a warning.
6573 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6574 relative while the `::` prefix makes a path absolute, but was ignored and the
6575 path was relative regardless.
6576 - [Floating point constants in match patterns is now a hard error][36890]
6577 This was previously a warning.
6578 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6579 match patterns is now a hard error][36891] This was previously a warning.
6580 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6582 - [From the pound escape, lines consisting of multiple `#`s are
6584 - [It is an error to re-export private enum variants][42460]. This is
6585 known to break a number of crates that depend on an older version of
6587 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6588 to use it to find the linker, and the build will fail where it did
6589 not previously][42607]
6591 [36886]: https://github.com/rust-lang/rust/issues/36886
6592 [36888]: https://github.com/rust-lang/rust/issues/36888
6593 [36890]: https://github.com/rust-lang/rust/issues/36890
6594 [36891]: https://github.com/rust-lang/rust/issues/36891
6595 [36892]: https://github.com/rust-lang/rust/issues/36892
6596 [37406]: https://github.com/rust-lang/rust/issues/37406
6597 [39983]: https://github.com/rust-lang/rust/pull/39983
6598 [41145]: https://github.com/rust-lang/rust/pull/41145
6599 [41192]: https://github.com/rust-lang/rust/pull/41192
6600 [41258]: https://github.com/rust-lang/rust/pull/41258
6601 [41370]: https://github.com/rust-lang/rust/pull/41370
6602 [41449]: https://github.com/rust-lang/rust/pull/41449
6603 [41530]: https://github.com/rust-lang/rust/pull/41530
6604 [41624]: https://github.com/rust-lang/rust/pull/41624
6605 [41656]: https://github.com/rust-lang/rust/pull/41656
6606 [41659]: https://github.com/rust-lang/rust/pull/41659
6607 [41676]: https://github.com/rust-lang/rust/pull/41676
6608 [41751]: https://github.com/rust-lang/rust/pull/41751
6609 [41764]: https://github.com/rust-lang/rust/pull/41764
6610 [41785]: https://github.com/rust-lang/rust/pull/41785
6611 [41873]: https://github.com/rust-lang/rust/pull/41873
6612 [41907]: https://github.com/rust-lang/rust/pull/41907
6613 [41946]: https://github.com/rust-lang/rust/pull/41946
6614 [42016]: https://github.com/rust-lang/rust/pull/42016
6615 [42037]: https://github.com/rust-lang/rust/pull/42037
6616 [42068]: https://github.com/rust-lang/rust/pull/42068
6617 [42150]: https://github.com/rust-lang/rust/pull/42150
6618 [42162]: https://github.com/rust-lang/rust/pull/42162
6619 [42225]: https://github.com/rust-lang/rust/pull/42225
6620 [42264]: https://github.com/rust-lang/rust/pull/42264
6621 [42302]: https://github.com/rust-lang/rust/pull/42302
6622 [42460]: https://github.com/rust-lang/rust/issues/42460
6623 [42607]: https://github.com/rust-lang/rust/issues/42607
6624 [42740]: https://github.com/rust-lang/rust/pull/42740
6625 [42844]: https://github.com/rust-lang/rust/issues/42844
6626 [42948]: https://github.com/rust-lang/rust/pull/42948
6627 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6628 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6629 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6630 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6631 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6632 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6633 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6634 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6635 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6636 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6637 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6638 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6639 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6640 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6641 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6642 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6643 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6644 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6645 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6646 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6647 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6648 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6651 Version 1.18.0 (2017-06-08)
6652 ===========================
6657 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6658 make the item visible to just that module tree. Also accepts the keyword
6659 `crate` to make something public to the whole crate but not users of the
6660 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6661 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6662 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6663 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6664 types like `Write + Send`, trailing `+` are now supported in trait objects,
6665 and better error reporting for trait objects starting with `?Sized`.
6666 - [0e+10 is now a valid floating point literal][40589]
6667 - [Now warns if you bind a lifetime parameter to 'static][40734]
6668 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6669 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6670 representation in some cases.][40377]
6675 - [rustc can now emit mir with `--emit mir`][39891]
6676 - [Improved LLVM IR for trivial functions][40367]
6677 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6678 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6679 opportunities found through profiling
6680 - [Improved backtrace formatting when panicking][38165]
6685 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6686 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6687 iteration or reallocation.
6688 - [Simplified HashMap Bucket interface][40561] provides performance
6689 improvements for iterating and cloning.
6690 - [Specialize Vec::from_elem to use calloc][40409]
6691 - [Fixed Race condition in fs::create_dir_all][39799]
6692 - [No longer caching stdio on Windows][40516]
6693 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6694 2.50%~ faster and in one case now 12.50% faster.
6695 - [Optimized `AtomicBool::fetch_nand`][41143]
6700 - [`Child::try_wait`]
6701 - [`HashMap::retain`]
6702 - [`HashSet::retain`]
6704 - [`TcpStream::peek`]
6705 - [`UdpSocket::peek`]
6706 - [`UdpSocket::peek_from`]
6711 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6712 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6713 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6714 - [Added Android build support][cargo/3885]
6715 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6716 of a certain type, for example `cargo build --bins` will build all
6718 - [Added support for haiku][cargo/3952]
6723 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6724 - [Rust now uses the official cross compiler for NetBSD][40612]
6725 - [rustdoc now accepts `#` at the start of files][40828]
6726 - [Fixed jemalloc support for musl][41168]
6731 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6732 always placed after the sign if it exists and before the digits. With the `#`
6733 flag the zeroes are placed after the prefix and before the digits.
6734 - [Due to the struct field optimisation][40377], using `transmute` on structs
6735 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6736 always been undefined behavior, but is now more likely to break in practice.
6737 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6738 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6739 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6740 - [Overlapping inherent `impl`s are now a hard error][40728]
6741 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6742 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6743 `out.asm` and `out.ll` instead of only one of the filetypes.
6744 - [ calling a function that returns `Self` will no longer work][41805] when
6745 the size of `Self` cannot be statically determined.
6746 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6747 this has caused a few regressions namely:
6749 - Changed the link order of local static/dynamic libraries (respecting the
6750 order on given rather than having the compiler reorder).
6751 - Changed how MinGW is linked, native code linked to dynamic libraries
6752 may require manually linking to the gcc support library (for the native
6755 [38165]: https://github.com/rust-lang/rust/pull/38165
6756 [39799]: https://github.com/rust-lang/rust/pull/39799
6757 [39891]: https://github.com/rust-lang/rust/pull/39891
6758 [40043]: https://github.com/rust-lang/rust/pull/40043
6759 [40241]: https://github.com/rust-lang/rust/pull/40241
6760 [40338]: https://github.com/rust-lang/rust/pull/40338
6761 [40367]: https://github.com/rust-lang/rust/pull/40367
6762 [40377]: https://github.com/rust-lang/rust/pull/40377
6763 [40409]: https://github.com/rust-lang/rust/pull/40409
6764 [40516]: https://github.com/rust-lang/rust/pull/40516
6765 [40556]: https://github.com/rust-lang/rust/pull/40556
6766 [40561]: https://github.com/rust-lang/rust/pull/40561
6767 [40589]: https://github.com/rust-lang/rust/pull/40589
6768 [40612]: https://github.com/rust-lang/rust/pull/40612
6769 [40723]: https://github.com/rust-lang/rust/pull/40723
6770 [40728]: https://github.com/rust-lang/rust/pull/40728
6771 [40731]: https://github.com/rust-lang/rust/pull/40731
6772 [40734]: https://github.com/rust-lang/rust/pull/40734
6773 [40805]: https://github.com/rust-lang/rust/pull/40805
6774 [40807]: https://github.com/rust-lang/rust/pull/40807
6775 [40828]: https://github.com/rust-lang/rust/pull/40828
6776 [40870]: https://github.com/rust-lang/rust/pull/40870
6777 [41085]: https://github.com/rust-lang/rust/pull/41085
6778 [41143]: https://github.com/rust-lang/rust/pull/41143
6779 [41168]: https://github.com/rust-lang/rust/pull/41168
6780 [41270]: https://github.com/rust-lang/rust/issues/41270
6781 [41469]: https://github.com/rust-lang/rust/pull/41469
6782 [41805]: https://github.com/rust-lang/rust/issues/41805
6783 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6784 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6785 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6786 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6787 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6788 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6789 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6790 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6791 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6792 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6793 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6794 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6795 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6796 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6799 Version 1.17.0 (2017-04-27)
6800 ===========================
6805 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6806 * [Fields of structs may be initialized without duplicating the field/variable
6807 names][39761]. [RFC 1682]
6808 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6809 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6810 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6811 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6812 `'b`. Soundness fix.
6813 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6814 * [Static variables may contain references to other statics][40027]
6819 * [Exit quickly on only `--emit dep-info`][40336]
6820 * [Make `-C relocation-model` more correctly determine whether the linker
6821 creates a position-independent executable][40245]
6822 * [Add `-C overflow-checks` to directly control whether integer overflow
6824 * [The rustc type checker now checks items on demand instead of in a single
6825 in-order pass][40008]. This is mostly an internal refactoring in support of
6826 future work, including incremental type checking, but also resolves [RFC
6827 1647], allowing `Self` to appear in `impl` `where` clauses.
6828 * [Optimize vtable loads][39995]
6829 * [Turn off vectorization for Emscripten targets][39990]
6830 * [Provide suggestions for unknown macros imported with `use`][39953]
6831 * [Fix ICEs in path resolution][39939]
6832 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6833 * [Add clearer error message using `&str + &str`][39116]
6844 * [`Ordering::then`]
6845 * [`Ordering::then_with`]
6846 * [`BTreeMap::range`]
6847 * [`BTreeMap::range_mut`]
6848 * [`collections::Bound`]
6849 * [`process::abort`]
6850 * [`ptr::read_unaligned`]
6851 * [`ptr::write_unaligned`]
6852 * [`Result::expect_err`]
6855 * [`Cell::into_inner`]
6861 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6862 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6863 * [`String` implements `FromIterator<&char>`][40028]
6864 * `Box` [implements][40009] a number of new conversions:
6865 `From<Box<str>> for String`,
6866 `From<Box<[T]>> for Vec<T>`,
6867 `From<Box<CStr>> for CString`,
6868 `From<Box<OsStr>> for OsString`,
6869 `From<Box<Path>> for PathBuf`,
6870 `Into<Box<str>> for String`,
6871 `Into<Box<[T]>> for Vec<T>`,
6872 `Into<Box<CStr>> for CString`,
6873 `Into<Box<OsStr>> for OsString`,
6874 `Into<Box<Path>> for PathBuf`,
6875 `Default for Box<str>`,
6876 `Default for Box<CStr>`,
6877 `Default for Box<OsStr>`,
6878 `From<&CStr> for Box<CStr>`,
6879 `From<&OsStr> for Box<OsStr>`,
6880 `From<&Path> for Box<Path>`
6881 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6882 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6883 * [Slightly optimize `slice::sort`][39538]
6884 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6885 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6886 `Box<str>` implements `From<&str>`][39438]
6887 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6888 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6889 * [`format!` estimates the needed capacity before writing a string][39356]
6890 * [Support unprivileged symlink creation in Windows][38921]
6891 * [`PathBuf` implements `Default`][38764]
6892 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6893 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6894 and poor hash functions.
6899 * [Add `cargo check --all`][cargo/3731]
6900 * [Add an option to ignore SSL revocation checking][cargo/3699]
6901 * [Add `cargo run --package`][cargo/3691]
6902 * [Add `required_features`][cargo/3667]
6903 * [Assume `build.rs` is a build script][cargo/3664]
6904 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6909 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6911 * [The "Unstable Book" documents nightly-only features][ubook]
6912 * [Improve the style of the sidebar in rustdoc output][40265]
6913 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6914 * [Fix MSP430 breakage due to `i128`][40257]
6915 * [Preliminary Solaris/SPARCv9 support][39903]
6916 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6917 run without installing the MSVC runtime.
6918 * [`rustdoc --test` includes file names in test names][39788]
6919 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6920 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6921 * [Initial support for `aarch64-unknown-freebsd`][39491]
6922 * [Initial support for `i686-unknown-netbsd`][39426]
6923 * [This release no longer includes the old makefile build system][39431]. Rust
6924 is built with a custom build system, written in Rust, and with Cargo.
6925 * [Add Debug implementations for libcollection structs][39002]
6926 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6927 * [`--test-threads=0` produces an error][38945]
6928 * [`rustup` installs documentation by default][40526]
6929 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6930 WinDbg and Visual Studio to improve the debugging experience.
6935 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6936 workaround, either use MSVC 2015 or run vcvars.bat.
6937 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6938 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6939 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6941 * [`format!` and `Display::to_string` panic if an underlying formatting
6942 implementation returns an error][40117]. Previously the error was silently
6943 ignored. It is incorrect for `write_fmt` to return an error when writing
6945 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6946 crates were marked stable and could be accessed from the stable toolchain.
6947 * [Rust git source no longer includes vendored crates][39728]. Those that need
6948 to build with vendored crates should build from release tarballs.
6949 * [Fix inert attributes from `proc_macro_derives`][39572]
6950 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6951 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6953 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6954 existing code generally ignores the type of dead-code unless a type-hint is
6955 provided; this can cause surprising inference interactions particularly around
6956 defaulting. The new code uniformly ignores the result type of dead-code.
6957 * [Tuple-struct constructors with private fields are no longer visible][38932]
6958 * [Lifetime parameters that do not appear in the arguments are now considered
6959 early-bound][38897], resolving a soundness bug (#[32330]). The
6960 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6962 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6963 * [Make transmuting from fn item types to pointer-sized types a hard
6966 [27787]: https://github.com/rust-lang/rust/issues/27787
6967 [32330]: https://github.com/rust-lang/rust/issues/32330
6968 [34198]: https://github.com/rust-lang/rust/pull/34198
6969 [38161]: https://github.com/rust-lang/rust/pull/38161
6970 [38368]: https://github.com/rust-lang/rust/pull/38368
6971 [38584]: https://github.com/rust-lang/rust/issues/38584
6972 [38661]: https://github.com/rust-lang/rust/pull/38661
6973 [38764]: https://github.com/rust-lang/rust/pull/38764
6974 [38864]: https://github.com/rust-lang/rust/issues/38864
6975 [38897]: https://github.com/rust-lang/rust/pull/38897
6976 [38921]: https://github.com/rust-lang/rust/pull/38921
6977 [38932]: https://github.com/rust-lang/rust/pull/38932
6978 [38945]: https://github.com/rust-lang/rust/pull/38945
6979 [38981]: https://github.com/rust-lang/rust/pull/38981
6980 [39002]: https://github.com/rust-lang/rust/pull/39002
6981 [39116]: https://github.com/rust-lang/rust/pull/39116
6982 [39193]: https://github.com/rust-lang/rust/pull/39193
6983 [39265]: https://github.com/rust-lang/rust/pull/39265
6984 [39356]: https://github.com/rust-lang/rust/pull/39356
6985 [39372]: https://github.com/rust-lang/rust/pull/39372
6986 [39426]: https://github.com/rust-lang/rust/pull/39426
6987 [39431]: https://github.com/rust-lang/rust/pull/39431
6988 [39438]: https://github.com/rust-lang/rust/pull/39438
6989 [39440]: https://github.com/rust-lang/rust/pull/39440
6990 [39485]: https://github.com/rust-lang/rust/pull/39485
6991 [39491]: https://github.com/rust-lang/rust/pull/39491
6992 [39518]: https://github.com/rust-lang/rust/pull/39518
6993 [39538]: https://github.com/rust-lang/rust/pull/39538
6994 [39572]: https://github.com/rust-lang/rust/pull/39572
6995 [39633]: https://github.com/rust-lang/rust/pull/39633
6996 [39642]: https://github.com/rust-lang/rust/pull/39642
6997 [39728]: https://github.com/rust-lang/rust/pull/39728
6998 [39761]: https://github.com/rust-lang/rust/pull/39761
6999 [39788]: https://github.com/rust-lang/rust/pull/39788
7000 [39793]: https://github.com/rust-lang/rust/pull/39793
7001 [39837]: https://github.com/rust-lang/rust/pull/39837
7002 [39843]: https://github.com/rust-lang/rust/pull/39843
7003 [39851]: https://github.com/rust-lang/rust/pull/39851
7004 [39903]: https://github.com/rust-lang/rust/pull/39903
7005 [39939]: https://github.com/rust-lang/rust/pull/39939
7006 [39953]: https://github.com/rust-lang/rust/pull/39953
7007 [39960]: https://github.com/rust-lang/rust/pull/39960
7008 [39990]: https://github.com/rust-lang/rust/pull/39990
7009 [39995]: https://github.com/rust-lang/rust/pull/39995
7010 [40008]: https://github.com/rust-lang/rust/pull/40008
7011 [40009]: https://github.com/rust-lang/rust/pull/40009
7012 [40027]: https://github.com/rust-lang/rust/pull/40027
7013 [40028]: https://github.com/rust-lang/rust/pull/40028
7014 [40037]: https://github.com/rust-lang/rust/pull/40037
7015 [40117]: https://github.com/rust-lang/rust/pull/40117
7016 [40166]: https://github.com/rust-lang/rust/pull/40166
7017 [40245]: https://github.com/rust-lang/rust/pull/40245
7018 [40257]: https://github.com/rust-lang/rust/pull/40257
7019 [40261]: https://github.com/rust-lang/rust/pull/40261
7020 [40265]: https://github.com/rust-lang/rust/pull/40265
7021 [40319]: https://github.com/rust-lang/rust/pull/40319
7022 [40336]: https://github.com/rust-lang/rust/pull/40336
7023 [40526]: https://github.com/rust-lang/rust/pull/40526
7024 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7025 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7026 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7027 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7028 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7029 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7030 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7031 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7032 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7033 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7034 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7035 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7036 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7037 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7038 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7039 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7040 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7041 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7042 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7043 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7044 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7045 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7046 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7047 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7048 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7049 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7050 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7051 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7052 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7053 [ubook]: https://doc.rust-lang.org/unstable-book/
7056 Version 1.16.0 (2017-03-16)
7057 ===========================
7062 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7063 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7064 match patterns][38069]
7065 * [Clean up semantics of `self` in an import list][38313]
7066 * [`Self` may appear in `impl` headers][38920]
7067 * [`Self` may appear in struct expressions][39282]
7072 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7073 a `.rmeta` file containing only crate metadata][38571]. This can be
7074 used by tools like the Rust Language Service to perform
7075 metadata-only builds.
7076 * [Levenshtein based typo suggestions now work in most places, while
7077 previously they worked only for fields and sometimes for local
7078 variables][38927]. Together with the overhaul of "no
7079 resolution"/"unexpected resolution" errors (#[38154]) they result in
7080 large and systematic improvement in resolution diagnostics.
7081 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7083 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7084 * [`rustc` no longer attempts to provide "consider using an explicit
7085 lifetime" suggestions][37057]. They were inaccurate.
7090 * [`VecDeque::truncate`]
7091 * [`VecDeque::resize`]
7092 * [`String::insert_str`]
7093 * [`Duration::checked_add`]
7094 * [`Duration::checked_sub`]
7095 * [`Duration::checked_div`]
7096 * [`Duration::checked_mul`]
7099 * [`SocketAddr::is_ipv4`]
7100 * [`SocketAddr::is_ipv6`]
7101 * [`IpAddr::is_ipv4`]
7102 * [`IpAddr::is_ipv6`]
7104 * [`Vec::dedup_by_key`]
7105 * [`Result::unwrap_or_default`]
7106 * [`<*const T>::wrapping_offset`]
7107 * [`<*mut T>::wrapping_offset`]
7108 * `CommandExt::creation_flags`
7109 * [`File::set_permissions`]
7110 * [`String::split_off`]
7115 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7116 their argument by `Borrow` parameter][37761]
7117 * [All public types in std implement `Debug`][38006]
7118 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7119 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7120 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7122 * [std: Fix partial writes in `LineWriter`][38062]
7123 * [std: Clamp max read/write sizes on Unix][38622]
7124 * [Use more specific panic message for `&str` slicing errors][38066]
7125 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7126 functionality cannot be achieved in std currently.
7127 * [`writeln!`, like `println!`, now accepts a form with no string
7128 or formatting arguments, to just print a newline][38469]
7129 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7130 * [Reduce the size of static data in `std_unicode::tables`][38781]
7131 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7132 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7134 * [`Duration` implements `Sum`][38712]
7135 * [`String` implements `ToSocketAddrs`][39048]
7140 * [The `cargo check` command does a type check of a project without
7141 building it][cargo/3296]
7142 * [crates.io will display CI badges from Travis and AppVeyor, if
7143 specified in Cargo.toml][cargo/3546]
7144 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7145 * [Compilation profiles accept integer values for `debug`, in addition
7146 to `true` and `false`. These are passed to `rustc` as the value to
7147 `-C debuginfo`][cargo/3534]
7148 * [Implement `cargo --version --verbose`][cargo/3604]
7149 * [All builds now output 'dep-info' build dependencies compatible with
7150 make and ninja][cargo/3557]
7151 * [Build all workspace members with `build --all`][cargo/3511]
7152 * [Document all workspace members with `doc --all`][cargo/3515]
7153 * [Path deps outside workspace are not members][cargo/3443]
7158 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7159 the path to the Rust implementation][38589]
7160 * [The `armv7-linux-androideabi` target no longer enables NEON
7161 extensions, per Google's ABI guide][38413]
7162 * [The stock standard library can be compiled for Redox OS][38401]
7163 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7165 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7167 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7172 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7173 match patterns][38069]
7174 * In this release, references to uninhabited types can not be
7175 pattern-matched. This was accidentally allowed in 1.15.
7176 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7177 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7179 * [Clean up semantics of `self` in an import list][38313]
7180 * Reimplemented lifetime elision. This change was almost entirely compatible
7181 with existing code, but it did close a number of small bugs and loopholes,
7182 as well as being more accepting in some other [cases][41105].
7184 [37057]: https://github.com/rust-lang/rust/pull/37057
7185 [37761]: https://github.com/rust-lang/rust/pull/37761
7186 [38006]: https://github.com/rust-lang/rust/pull/38006
7187 [38051]: https://github.com/rust-lang/rust/pull/38051
7188 [38062]: https://github.com/rust-lang/rust/pull/38062
7189 [38622]: https://github.com/rust-lang/rust/pull/38622
7190 [38066]: https://github.com/rust-lang/rust/pull/38066
7191 [38069]: https://github.com/rust-lang/rust/pull/38069
7192 [38131]: https://github.com/rust-lang/rust/pull/38131
7193 [38154]: https://github.com/rust-lang/rust/pull/38154
7194 [38274]: https://github.com/rust-lang/rust/pull/38274
7195 [38304]: https://github.com/rust-lang/rust/pull/38304
7196 [38313]: https://github.com/rust-lang/rust/pull/38313
7197 [38327]: https://github.com/rust-lang/rust/pull/38327
7198 [38401]: https://github.com/rust-lang/rust/pull/38401
7199 [38413]: https://github.com/rust-lang/rust/pull/38413
7200 [38469]: https://github.com/rust-lang/rust/pull/38469
7201 [38559]: https://github.com/rust-lang/rust/pull/38559
7202 [38571]: https://github.com/rust-lang/rust/pull/38571
7203 [38580]: https://github.com/rust-lang/rust/pull/38580
7204 [38589]: https://github.com/rust-lang/rust/pull/38589
7205 [38670]: https://github.com/rust-lang/rust/pull/38670
7206 [38712]: https://github.com/rust-lang/rust/pull/38712
7207 [38726]: https://github.com/rust-lang/rust/pull/38726
7208 [38781]: https://github.com/rust-lang/rust/pull/38781
7209 [38798]: https://github.com/rust-lang/rust/pull/38798
7210 [38909]: https://github.com/rust-lang/rust/pull/38909
7211 [38920]: https://github.com/rust-lang/rust/pull/38920
7212 [38927]: https://github.com/rust-lang/rust/pull/38927
7213 [39048]: https://github.com/rust-lang/rust/pull/39048
7214 [39282]: https://github.com/rust-lang/rust/pull/39282
7215 [39379]: https://github.com/rust-lang/rust/pull/39379
7216 [41105]: https://github.com/rust-lang/rust/issues/41105
7217 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7218 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7219 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7220 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7221 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7222 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7223 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7224 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7225 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7226 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7227 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7228 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7229 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7230 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7231 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7232 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7233 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7234 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7235 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7236 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7237 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7238 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7239 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7240 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7241 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7242 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7243 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7244 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7245 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7248 Version 1.15.1 (2017-02-09)
7249 ===========================
7251 * [Fix IntoIter::as_mut_slice's signature][39466]
7252 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7254 [39466]: https://github.com/rust-lang/rust/pull/39466
7255 [39523]: https://github.com/rust-lang/rust/pull/39523
7258 Version 1.15.0 (2017-02-02)
7259 ===========================
7264 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7265 stable. This allows popular code-generating crates like Serde and Diesel to
7266 work ergonomically. [RFC 1681].
7267 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7268 with curly braces][36868]. Part of [RFC 1506].
7269 * [A number of minor changes to name resolution have been activated][37127].
7270 They add up to more consistent semantics, allowing for future evolution of
7271 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7272 details of what is different. The breaking changes here have been transitioned
7273 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7274 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7276 * [`?Sized` can be used in `where` clauses][37791]
7277 * [There is now a limit on the size of monomorphized types and it can be
7278 modified with the `#![type_size_limit]` crate attribute, similarly to
7279 the `#![recursion_limit]` attribute][37789]
7284 * [On Windows, the compiler will apply dllimport attributes when linking to
7285 extern functions][37973]. Additional attributes and flags can control which
7286 library kind is linked and its name. [RFC 1717].
7287 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7288 * [The `--test` flag works with procedural macro crates][38107]
7289 * [Fix `extern "aapcs" fn` ABI][37814]
7290 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7291 * [The `format!` expander recognizes incorrect `printf` and shell-style
7292 formatting directives and suggests the correct format][37613].
7293 * [Only report one error for all unused imports in an import list][37456]
7295 Compiler Performance
7296 --------------------
7298 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7299 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7300 * [Don't clone in `UnificationTable::probe`][37848]
7301 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7302 * [Use small vectors in type walker][37760]
7303 * [Macro expansion performance was improved][37701]
7304 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7305 * [Replace FNV with a faster hash function][37229]
7310 * [`std::iter::Iterator::min_by`]
7311 * [`std::iter::Iterator::max_by`]
7312 * [`std::os::*::fs::FileExt`]
7313 * [`std::sync::atomic::Atomic*::get_mut`]
7314 * [`std::sync::atomic::Atomic*::into_inner`]
7315 * [`std::vec::IntoIter::as_slice`]
7316 * [`std::vec::IntoIter::as_mut_slice`]
7317 * [`std::sync::mpsc::Receiver::try_iter`]
7318 * [`std::os::unix::process::CommandExt::before_exec`]
7319 * [`std::rc::Rc::strong_count`]
7320 * [`std::rc::Rc::weak_count`]
7321 * [`std::sync::Arc::strong_count`]
7322 * [`std::sync::Arc::weak_count`]
7323 * [`std::char::encode_utf8`]
7324 * [`std::char::encode_utf16`]
7325 * [`std::cell::Ref::clone`]
7326 * [`std::io::Take::into_inner`]
7331 * [The standard sorting algorithm has been rewritten for dramatic performance
7332 improvements][38192]. It is a hybrid merge sort, drawing influences from
7333 Timsort. Previously it was a naive merge sort.
7334 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7335 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7337 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7338 and `char_indices().last()`][37882]
7339 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7340 * [Chinese characters display correctly in `fmt::Debug`][37855]
7341 * [Derive `Default` for `Duration`][37699]
7342 * [Support creation of anonymous pipes on WinXP/2k][37677]
7343 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7344 * [Don't pass overlapped handles to processes][38835]
7349 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7350 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7351 should instead check the variable at runtime with `std::env`. That the value
7352 was set at build time was a bug, and incorrect when cross-compiling. This
7353 change is known to cause breakage.
7354 * [Add `--all` flag to `cargo test`][cargo/3221]
7355 * [Compile statically against the MSVC CRT][cargo/3363]
7356 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7357 * [Link OpenSSL statically on OSX][cargo/3311]
7358 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7359 * [Test for bad path overrides with summaries][cargo/3336]
7360 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7361 * [Fix retrying crate downloads for network errors][cargo/3348]
7362 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7363 * [Emit more info on --message-format=json][cargo/3319]
7364 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7365 * [Don't ignore errors in workspace manifest][cargo/3409]
7366 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7371 * [Test runners (binaries built with `--test`) now support a `--list` argument
7372 that lists the tests it contains][38185]
7373 * [Test runners now support a `--exact` argument that makes the test filter
7374 match exactly, instead of matching only a substring of the test name][38181]
7375 * [rustdoc supports a `--playground-url` flag][37763]
7376 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7381 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7382 continue to be used in this release by passing `--disable-rustbuild` to the
7383 configure script, but they will be deleted soon. Note that the new build
7384 system uses a different on-disk layout that will likely affect any scripts
7386 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7388 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7389 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7395 * [A number of minor changes to name resolution have been activated][37127].
7396 They add up to more consistent semantics, allowing for future evolution of
7397 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7398 details of what is different. The breaking changes here have been transitioned
7399 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7400 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7401 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7402 should instead check the variable at runtime with `std::env`. That the value
7403 was set at build time was a bug, and incorrect when cross-compiling. This
7404 change is known to cause breakage.
7405 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7406 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7407 1.10 and is now an error by default. It will become a hard error in the near
7409 * [The semantics relating modules to file system directories are changing in
7410 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7411 lint, which is a warning in this release, and will become a hard error in the
7413 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7414 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7415 the underlying iterator][37834]
7417 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7418 [33685]: https://github.com/rust-lang/rust/issues/33685
7419 [36868]: https://github.com/rust-lang/rust/pull/36868
7420 [37127]: https://github.com/rust-lang/rust/pull/37127
7421 [37229]: https://github.com/rust-lang/rust/pull/37229
7422 [37456]: https://github.com/rust-lang/rust/pull/37456
7423 [37527]: https://github.com/rust-lang/rust/pull/37527
7424 [37602]: https://github.com/rust-lang/rust/pull/37602
7425 [37613]: https://github.com/rust-lang/rust/pull/37613
7426 [37615]: https://github.com/rust-lang/rust/pull/37615
7427 [37636]: https://github.com/rust-lang/rust/pull/37636
7428 [37627]: https://github.com/rust-lang/rust/pull/37627
7429 [37642]: https://github.com/rust-lang/rust/pull/37642
7430 [37677]: https://github.com/rust-lang/rust/pull/37677
7431 [37699]: https://github.com/rust-lang/rust/pull/37699
7432 [37701]: https://github.com/rust-lang/rust/pull/37701
7433 [37705]: https://github.com/rust-lang/rust/pull/37705
7434 [37749]: https://github.com/rust-lang/rust/pull/37749
7435 [37760]: https://github.com/rust-lang/rust/pull/37760
7436 [37763]: https://github.com/rust-lang/rust/pull/37763
7437 [37764]: https://github.com/rust-lang/rust/pull/37764
7438 [37789]: https://github.com/rust-lang/rust/pull/37789
7439 [37791]: https://github.com/rust-lang/rust/pull/37791
7440 [37814]: https://github.com/rust-lang/rust/pull/37814
7441 [37817]: https://github.com/rust-lang/rust/pull/37817
7442 [37834]: https://github.com/rust-lang/rust/pull/37834
7443 [37848]: https://github.com/rust-lang/rust/pull/37848
7444 [37855]: https://github.com/rust-lang/rust/pull/37855
7445 [37882]: https://github.com/rust-lang/rust/pull/37882
7446 [37888]: https://github.com/rust-lang/rust/pull/37888
7447 [37973]: https://github.com/rust-lang/rust/pull/37973
7448 [37979]: https://github.com/rust-lang/rust/pull/37979
7449 [38086]: https://github.com/rust-lang/rust/pull/38086
7450 [38107]: https://github.com/rust-lang/rust/pull/38107
7451 [38117]: https://github.com/rust-lang/rust/pull/38117
7452 [38134]: https://github.com/rust-lang/rust/pull/38134
7453 [38146]: https://github.com/rust-lang/rust/pull/38146
7454 [38181]: https://github.com/rust-lang/rust/pull/38181
7455 [38182]: https://github.com/rust-lang/rust/pull/38182
7456 [38185]: https://github.com/rust-lang/rust/pull/38185
7457 [38192]: https://github.com/rust-lang/rust/pull/38192
7458 [38279]: https://github.com/rust-lang/rust/pull/38279
7459 [38835]: https://github.com/rust-lang/rust/pull/38835
7460 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7461 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7462 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7463 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7464 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7465 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7466 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7467 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7468 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7469 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7470 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7471 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7472 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7473 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7474 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7475 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7476 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7477 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7478 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7479 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7480 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7481 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7482 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7483 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7484 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7485 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7486 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7487 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7488 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7489 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7490 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7491 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7492 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7493 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7494 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7495 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7496 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7499 Version 1.14.0 (2016-12-22)
7500 ===========================
7505 * [`..` matches multiple tuple fields in enum variants, structs
7506 and tuples][36843]. [RFC 1492].
7507 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7508 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7509 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7510 dereferencing][36822]
7515 * [Mark enums with non-zero discriminant as non-zero][37224]
7516 * [Lower-case `static mut` names are linted like other
7517 statics and consts][37162]
7518 * [Fix ICE on some macros in const integer positions
7519 (e.g. `[u8; m!()]`)][36819]
7520 * [Improve error message and snippet for "did you mean `x`"][36798]
7521 * [Add a panic-strategy field to the target specification][36794]
7522 * [Include LLVM version in `--version --verbose`][37200]
7524 Compile-time Optimizations
7525 --------------------------
7527 * [Improve macro expansion performance][37569]
7528 * [Shrink `Expr_::ExprInlineAsm`][37445]
7529 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7530 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7531 * [Avoid more allocations when compiling html5ever][37373]
7532 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7533 * [Avoid some allocations in the macro parser][37318]
7534 * [Use a faster deflate setting][37298]
7535 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7536 during interning of slices][37270]
7537 * [Optimize `write_metadata`][37267]
7538 * [Don't process obligation forest cycles when stalled][37231]
7539 * [Avoid many `CrateConfig` clones][37161]
7540 * [Optimize `Substs::super_fold_with`][37108]
7541 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7542 * [Speed up `plug_leaks`][36917]
7547 * [`println!()`, with no arguments, prints newline][36825].
7548 Previously, an empty string was required to achieve the same.
7549 * [`Wrapping` impls standard binary and unary operators, as well as
7550 the `Sum` and `Product` iterators][37356]
7551 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7553 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7554 `VecDeque` iterators][37315]
7555 * [Improve `SipHasher` performance on small values][37312]
7556 * [Add Iterator trait TrustedLen to enable better FromIterator /
7558 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7559 * [`ReadDir` implements `Debug`][37221]
7560 * [Implement `RefUnwindSafe` for atomic types][37178]
7561 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7562 * [Avoid allocations in `Decoder::read_str`][37064]
7563 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7564 * [Impl `Debug` for raw pointers to unsized data][36880]
7565 * [Don't reuse `HashMap` random seeds][37470]
7566 * [The internal memory layout of `HashMap` is more cache-friendly, for
7567 significant improvements in some operations][36692]
7568 * [`HashMap` uses less memory on 32-bit architectures][36595]
7569 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7574 * [Expose rustc cfg values to build scripts][cargo/3243]
7575 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7576 * [Fix passing --features when testing multiple packages][cargo/3280]
7577 * [Use a single profile set per workspace][cargo/3249]
7578 * [Load `replace` sections from lock files][cargo/3220]
7579 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7584 * [rustup is the recommended Rust installation method][1.14rustup]
7585 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7586 S390x. These are [tier 2] platforms and may have major defects. Follow the
7587 instructions on the website to install, or add the targets to an existing
7588 installation with `rustup target add`. The new target triples are:
7589 - `mips-unknown-linux-gnu`
7590 - `mipsel-unknown-linux-gnu`
7591 - `mips64-unknown-linux-gnuabi64`
7592 - `mips64el-unknown-linux-gnuabi64 `
7593 - `powerpc-unknown-linux-gnu`
7594 - `powerpc64-unknown-linux-gnu`
7595 - `powerpc64le-unknown-linux-gnu`
7596 - `s390x-unknown-linux-gnu `
7597 * This release includes target (std) builds for ARM Linux running MUSL
7598 libc. These are [tier 2] platforms and may have major defects. Add the
7599 following triples to an existing rustup installation with `rustup target add`:
7600 - `arm-unknown-linux-musleabi`
7601 - `arm-unknown-linux-musleabihf`
7602 - `armv7-unknown-linux-musleabihf`
7603 * This release includes [experimental support for WebAssembly][1.14wasm], via
7604 the `wasm32-unknown-emscripten` target. This target is known to have major
7605 defects. Please test, report, and fix.
7606 * rustup no longer installs documentation by default. Run `rustup
7607 component add rust-docs` to install.
7608 * [Fix line stepping in debugger][37310]
7609 * [Enable line number debuginfo in releases][37280]
7614 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7615 * [Add support for Fuchsia OS][37313]
7616 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7621 * [A number of forward-compatibility lints used by the compiler
7622 to gradually introduce language changes have been converted
7623 to deny by default][36894]:
7624 - ["use of inaccessible extern crate erroneously allowed"][36886]
7625 - ["type parameter default erroneously allowed in invalid location"][36887]
7626 - ["detects super or self keywords at the beginning of global path"][36888]
7627 - ["two overlapping inherent impls define an item with the same name
7628 were erroneously allowed"][36889]
7629 - ["floating-point constants cannot be used in patterns"][36890]
7630 - ["constants of struct or enum type can only be used in a pattern if
7631 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7632 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7633 * [Prohibit patterns in trait methods without bodies][37378]
7634 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7635 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7636 * [The `$crate` macro variable is accepted in fewer locations][37213]
7637 * [Impls specifying extra region requirements beyond the trait
7638 they implement are rejected][37167]
7639 * [Enums may not be unsized][37111]. Unsized enums are intended to
7640 work but never have. For now they are forbidden.
7641 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7643 [tier 2]: https://forge.rust-lang.org/platform-support.html
7644 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7645 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7646 [36430]: https://github.com/rust-lang/rust/pull/36430
7647 [36595]: https://github.com/rust-lang/rust/pull/36595
7648 [36692]: https://github.com/rust-lang/rust/pull/36692
7649 [36767]: https://github.com/rust-lang/rust/pull/36767
7650 [36794]: https://github.com/rust-lang/rust/pull/36794
7651 [36798]: https://github.com/rust-lang/rust/pull/36798
7652 [36819]: https://github.com/rust-lang/rust/pull/36819
7653 [36822]: https://github.com/rust-lang/rust/pull/36822
7654 [36825]: https://github.com/rust-lang/rust/pull/36825
7655 [36843]: https://github.com/rust-lang/rust/pull/36843
7656 [36880]: https://github.com/rust-lang/rust/pull/36880
7657 [36886]: https://github.com/rust-lang/rust/issues/36886
7658 [36887]: https://github.com/rust-lang/rust/issues/36887
7659 [36888]: https://github.com/rust-lang/rust/issues/36888
7660 [36889]: https://github.com/rust-lang/rust/issues/36889
7661 [36890]: https://github.com/rust-lang/rust/issues/36890
7662 [36891]: https://github.com/rust-lang/rust/issues/36891
7663 [36892]: https://github.com/rust-lang/rust/issues/36892
7664 [36894]: https://github.com/rust-lang/rust/pull/36894
7665 [36917]: https://github.com/rust-lang/rust/pull/36917
7666 [36993]: https://github.com/rust-lang/rust/pull/36993
7667 [37037]: https://github.com/rust-lang/rust/pull/37037
7668 [37064]: https://github.com/rust-lang/rust/pull/37064
7669 [37094]: https://github.com/rust-lang/rust/pull/37094
7670 [37108]: https://github.com/rust-lang/rust/pull/37108
7671 [37111]: https://github.com/rust-lang/rust/pull/37111
7672 [37161]: https://github.com/rust-lang/rust/pull/37161
7673 [37162]: https://github.com/rust-lang/rust/pull/37162
7674 [37167]: https://github.com/rust-lang/rust/pull/37167
7675 [37178]: https://github.com/rust-lang/rust/pull/37178
7676 [37200]: https://github.com/rust-lang/rust/pull/37200
7677 [37213]: https://github.com/rust-lang/rust/pull/37213
7678 [37221]: https://github.com/rust-lang/rust/pull/37221
7679 [37224]: https://github.com/rust-lang/rust/pull/37224
7680 [37230]: https://github.com/rust-lang/rust/pull/37230
7681 [37231]: https://github.com/rust-lang/rust/pull/37231
7682 [37247]: https://github.com/rust-lang/rust/pull/37247
7683 [37267]: https://github.com/rust-lang/rust/pull/37267
7684 [37270]: https://github.com/rust-lang/rust/pull/37270
7685 [37273]: https://github.com/rust-lang/rust/pull/37273
7686 [37280]: https://github.com/rust-lang/rust/pull/37280
7687 [37298]: https://github.com/rust-lang/rust/pull/37298
7688 [37306]: https://github.com/rust-lang/rust/pull/37306
7689 [37310]: https://github.com/rust-lang/rust/pull/37310
7690 [37312]: https://github.com/rust-lang/rust/pull/37312
7691 [37313]: https://github.com/rust-lang/rust/pull/37313
7692 [37315]: https://github.com/rust-lang/rust/pull/37315
7693 [37318]: https://github.com/rust-lang/rust/pull/37318
7694 [37322]: https://github.com/rust-lang/rust/pull/37322
7695 [37326]: https://github.com/rust-lang/rust/pull/37326
7696 [37351]: https://github.com/rust-lang/rust/pull/37351
7697 [37356]: https://github.com/rust-lang/rust/pull/37356
7698 [37367]: https://github.com/rust-lang/rust/pull/37367
7699 [37373]: https://github.com/rust-lang/rust/pull/37373
7700 [37378]: https://github.com/rust-lang/rust/pull/37378
7701 [37389]: https://github.com/rust-lang/rust/pull/37389
7702 [37392]: https://github.com/rust-lang/rust/pull/37392
7703 [37427]: https://github.com/rust-lang/rust/pull/37427
7704 [37439]: https://github.com/rust-lang/rust/pull/37439
7705 [37445]: https://github.com/rust-lang/rust/pull/37445
7706 [37470]: https://github.com/rust-lang/rust/pull/37470
7707 [37569]: https://github.com/rust-lang/rust/pull/37569
7708 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7709 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7710 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7711 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7712 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7713 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7714 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7717 Version 1.13.0 (2016-11-10)
7718 ===========================
7723 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7724 errors, like the `try!` macro, described in [RFC 0243].
7725 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7726 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7727 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7728 * [Fix lifetime rules for 'if' conditions][36029]
7729 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7734 * [Add the `-C link-arg` argument][36574]
7735 * [Remove the old AST-based backend from rustc_trans][35764]
7736 * [Don't enable NEON by default on armv7 Linux][35814]
7737 * [Fix debug line number info for macro expansions][35238]
7738 * [Do not emit "class method" debuginfo for types that are not
7739 DICompositeType][36008]
7740 * [Warn about multiple conflicting #[repr] hints][34623]
7741 * [When sizing DST, don't double-count nested struct prefixes][36351]
7742 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7743 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7744 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7745 * [Expand macros without recursing to avoid stack overflows][36214]
7750 * [Replace macro backtraces with labeled local uses][35702]
7751 * [Improve error message for misplaced doc comments][33922]
7752 * [Buffer unix and lock windows to prevent message interleaving][35975]
7753 * [Update lifetime errors to specifically note temporaries][36171]
7754 * [Special case a few colors for Windows][36178]
7755 * [Suggest `use self` when such an import resolves][36289]
7756 * [Be more specific when type parameter shadows primitive type][36338]
7757 * Many minor improvements
7759 Compile-time Optimizations
7760 --------------------------
7762 * [Compute and cache HIR hashes at beginning][35854]
7763 * [Don't hash types in loan paths][36004]
7764 * [Cache projections in trans][35761]
7765 * [Optimize the parser's last token handling][36527]
7766 * [Only instantiate #[inline] functions in codegen units referencing
7767 them][36524]. This leads to big improvements in cases where crates export
7768 define many inline functions without using them directly.
7769 * [Lazily allocate TypedArena's first chunk][36592]
7770 * [Don't allocate during default HashSet creation][36734]
7777 * [`overflowing_abs`]
7778 * [`RefCell::try_borrow`]
7779 * [`RefCell::try_borrow_mut`]
7784 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7785 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7787 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7788 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7789 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7790 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7791 * [Use arc4rand on FreeBSD][35884]
7792 * [memrchr: Correct aligned offset computation][35969]
7793 * [Improve Demangling of Rust Symbols][36059]
7794 * [Use monotonic time in condition variables][35048]
7795 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7796 * [Implement conversion traits for `char`][35755]
7797 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7798 * [Zero first byte of CString on drop][36264]
7799 * [Inherit overflow checks for sum and product][36372]
7800 * [Add missing Eq implementations][36423]
7801 * [Implement `Debug` for `DirEntry`][36631]
7802 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7804 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7805 * [Implement more traits for `std::io::ErrorKind`][35911]
7806 * [Optimize BinaryHeap bounds checking][36072]
7807 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7808 `extend_with_element`][36355]
7809 * [Fix overflow checking in unsigned pow()][34942]
7814 * This release includes security fixes to both curl and OpenSSL.
7815 * [Fix transitive doctests when panic=abort][cargo/3021]
7816 * [Add --all-features flag to cargo][cargo/3038]
7817 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7818 * [Don't parse the home directory more than once][cargo/3078]
7819 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7820 * [Update OpenSSL to 1.0.2j][cargo/3121]
7821 * [Add license and license_file to cargo metadata output][cargo/3110]
7822 * [Make crates-io registry URL optional in config; ignore all changes to
7823 source.crates-io][cargo/3089]
7824 * [Don't download dependencies from other platforms][cargo/3123]
7825 * [Build transitive dev-dependencies when needed][cargo/3125]
7826 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7827 * [Avoid updating registry when adding existing deps][cargo/3144]
7828 * [Warn about path overrides that won't work][cargo/3136]
7829 * [Use workspaces during `cargo install`][cargo/3146]
7830 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7831 * [Add --message-format flag][cargo/3000]
7832 * [Pass target environment for rustdoc][cargo/3205]
7833 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7834 * [Update curl and curl-sys][cargo/3241]
7835 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7840 * [rustdoc: Add the `--sysroot` argument][36586]
7841 * [rustdoc: Fix a couple of issues with the search results][35655]
7842 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7843 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7844 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7849 * [Remove unmaintained style guide][35124]
7850 * [Add s390x support][36369]
7851 * [Initial work at Haiku OS support][36727]
7852 * [Add mips-uclibc targets][35734]
7853 * [Crate-ify compiler-rt into compiler-builtins][35021]
7854 * [Add rustc version info (git hash + date) to dist tarball][36213]
7855 * Many documentation improvements
7860 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7861 * [Deny (by default) transmuting from fn item types to pointer-sized
7862 types][34923]. Continuing the long transition to zero-sized fn items,
7864 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7866 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7867 * [Fix lifetime rules for 'if' conditions][36029].
7868 * [Inherit overflow checks for sum and product][36372].
7869 * [Forbid user-defined macros named "macro_rules"][36730].
7871 [33922]: https://github.com/rust-lang/rust/pull/33922
7872 [34623]: https://github.com/rust-lang/rust/pull/34623
7873 [34923]: https://github.com/rust-lang/rust/pull/34923
7874 [34942]: https://github.com/rust-lang/rust/pull/34942
7875 [35021]: https://github.com/rust-lang/rust/pull/35021
7876 [35048]: https://github.com/rust-lang/rust/pull/35048
7877 [35074]: https://github.com/rust-lang/rust/pull/35074
7878 [35124]: https://github.com/rust-lang/rust/pull/35124
7879 [35234]: https://github.com/rust-lang/rust/pull/35234
7880 [35238]: https://github.com/rust-lang/rust/pull/35238
7881 [35354]: https://github.com/rust-lang/rust/pull/35354
7882 [35559]: https://github.com/rust-lang/rust/pull/35559
7883 [35585]: https://github.com/rust-lang/rust/pull/35585
7884 [35627]: https://github.com/rust-lang/rust/pull/35627
7885 [35655]: https://github.com/rust-lang/rust/pull/35655
7886 [35702]: https://github.com/rust-lang/rust/pull/35702
7887 [35707]: https://github.com/rust-lang/rust/pull/35707
7888 [35728]: https://github.com/rust-lang/rust/pull/35728
7889 [35734]: https://github.com/rust-lang/rust/pull/35734
7890 [35755]: https://github.com/rust-lang/rust/pull/35755
7891 [35761]: https://github.com/rust-lang/rust/pull/35761
7892 [35764]: https://github.com/rust-lang/rust/pull/35764
7893 [35814]: https://github.com/rust-lang/rust/pull/35814
7894 [35854]: https://github.com/rust-lang/rust/pull/35854
7895 [35871]: https://github.com/rust-lang/rust/pull/35871
7896 [35884]: https://github.com/rust-lang/rust/pull/35884
7897 [35911]: https://github.com/rust-lang/rust/pull/35911
7898 [35969]: https://github.com/rust-lang/rust/pull/35969
7899 [35975]: https://github.com/rust-lang/rust/pull/35975
7900 [36004]: https://github.com/rust-lang/rust/pull/36004
7901 [36008]: https://github.com/rust-lang/rust/pull/36008
7902 [36014]: https://github.com/rust-lang/rust/pull/36014
7903 [36029]: https://github.com/rust-lang/rust/pull/36029
7904 [36059]: https://github.com/rust-lang/rust/pull/36059
7905 [36072]: https://github.com/rust-lang/rust/pull/36072
7906 [36101]: https://github.com/rust-lang/rust/pull/36101
7907 [36104]: https://github.com/rust-lang/rust/pull/36104
7908 [36171]: https://github.com/rust-lang/rust/pull/36171
7909 [36173]: https://github.com/rust-lang/rust/pull/36173
7910 [36178]: https://github.com/rust-lang/rust/pull/36178
7911 [36213]: https://github.com/rust-lang/rust/pull/36213
7912 [36214]: https://github.com/rust-lang/rust/pull/36214
7913 [36264]: https://github.com/rust-lang/rust/pull/36264
7914 [36266]: https://github.com/rust-lang/rust/pull/36266
7915 [36289]: https://github.com/rust-lang/rust/pull/36289
7916 [36338]: https://github.com/rust-lang/rust/pull/36338
7917 [36351]: https://github.com/rust-lang/rust/pull/36351
7918 [36355]: https://github.com/rust-lang/rust/pull/36355
7919 [36369]: https://github.com/rust-lang/rust/pull/36369
7920 [36372]: https://github.com/rust-lang/rust/pull/36372
7921 [36423]: https://github.com/rust-lang/rust/pull/36423
7922 [36482]: https://github.com/rust-lang/rust/pull/36482
7923 [36505]: https://github.com/rust-lang/rust/pull/36505
7924 [36524]: https://github.com/rust-lang/rust/pull/36524
7925 [36527]: https://github.com/rust-lang/rust/pull/36527
7926 [36551]: https://github.com/rust-lang/rust/pull/36551
7927 [36574]: https://github.com/rust-lang/rust/pull/36574
7928 [36586]: https://github.com/rust-lang/rust/pull/36586
7929 [36592]: https://github.com/rust-lang/rust/pull/36592
7930 [36631]: https://github.com/rust-lang/rust/pull/36631
7931 [36721]: https://github.com/rust-lang/rust/pull/36721
7932 [36727]: https://github.com/rust-lang/rust/pull/36727
7933 [36730]: https://github.com/rust-lang/rust/pull/36730
7934 [36734]: https://github.com/rust-lang/rust/pull/36734
7935 [36754]: https://github.com/rust-lang/rust/pull/36754
7936 [36995]: https://github.com/rust-lang/rust/pull/36995
7937 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7938 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7939 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7940 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7941 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7942 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7943 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7944 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7945 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7946 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7947 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7948 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7949 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7950 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7951 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7952 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7953 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7954 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7955 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7956 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7957 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7958 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7959 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7960 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7961 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7962 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7963 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7964 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7965 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7966 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7967 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7968 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7971 Version 1.12.1 (2016-10-20)
7972 ===========================
7977 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7978 * [Confusion with double negation and booleans][36856]
7979 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7980 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7981 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7982 * [Corrupted memory after updated to 1.12][36936]
7983 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7984 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7985 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7987 [36381]: https://github.com/rust-lang/rust/issues/36381
7988 [36856]: https://github.com/rust-lang/rust/issues/36856
7989 [36875]: https://github.com/rust-lang/rust/issues/36875
7990 [36924]: https://github.com/rust-lang/rust/issues/36924
7991 [36926]: https://github.com/rust-lang/rust/issues/36926
7992 [36936]: https://github.com/rust-lang/rust/issues/36936
7993 [37026]: https://github.com/rust-lang/rust/issues/37026
7994 [37112]: https://github.com/rust-lang/rust/issues/37112
7995 [37153]: https://github.com/rust-lang/rust/issues/37153
7998 Version 1.12.0 (2016-09-29)
7999 ===========================
8004 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8005 This translation pass is far simpler than the previous AST->LLVM pass, and
8006 creates opportunities to perform new optimizations directly on the MIR. It
8007 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8008 * [`rustc` presents a new, more readable error format, along with
8009 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8010 Most common editors supporting Rust have been updated to work with it. It was
8011 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8016 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8017 This translation pass is far simpler than the previous AST->LLVM pass, and
8018 creates opportunities to perform new optimizations directly on the MIR. It
8019 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8020 * [Print the Rust target name, not the LLVM target name, with
8021 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8022 * [The computation of `TypeId` is correct in some cases where it was previously
8023 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8024 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8025 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8026 `--print relocation-models`, and `--print code-models` print the available
8027 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8028 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8029 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8030 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8031 These targets produce statically-linked binaries. There are no binary release
8037 * [`rustc` presents a new, more readable error format, along with
8038 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8039 Most common editors supporting Rust have been updated to work with it. It was
8040 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8041 * [In error descriptions, references are now described in plain English,
8042 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8043 * [In error type descriptions, unknown numeric types are named `{integer}` or
8044 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8045 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8050 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8051 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8052 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8053 useful](https://github.com/rust-lang/rust/pull/34908)
8054 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8055 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8056 * [Semicolons are properly required as statement delimiters inside
8057 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8058 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8063 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8064 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8065 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8066 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8067 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8068 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8069 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8070 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8071 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8072 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8073 Both on Unix and Windows.
8074 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8075 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8076 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8077 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8078 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8079 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8080 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8081 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8086 * [The `format!` macro and friends now allow a single argument to be formatted
8087 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8088 * [The lifetime bounds on `[T]::binary_search_by` and
8089 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8090 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8091 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8092 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8093 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8094 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8095 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8096 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8097 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8098 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8099 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8100 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8101 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8102 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8103 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8104 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8105 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8106 * [`mpsc::sync_channel` `Receiver`s return any available message before
8107 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8108 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8109 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8114 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8115 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8116 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8117 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8118 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8119 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8120 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8121 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8122 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8123 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8124 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8125 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8126 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8127 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8128 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8129 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8134 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8135 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8140 * [Test binaries now support a `--test-threads` argument to specify the number
8141 of threads used to run tests, and which acts the same as the
8142 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8143 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8144 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8145 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8146 * [Rust releases now come with source packages that can be installed by rustup
8147 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8148 The resulting source code can be used by tools and IDES, located in the
8149 sysroot under `lib/rustlib/src`.
8154 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8155 * Many minor improvements to the documentation.
8156 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8161 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8162 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8163 * [When formatting strings, if "precision" is specified, the "fill",
8164 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8165 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8168 Version 1.11.0 (2016-08-18)
8169 ===========================
8174 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8175 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8176 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8177 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8182 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8183 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8184 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8185 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8186 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8187 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8188 (in libcore - previously stabilized in libstd)
8189 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8190 (in libcore - previously stabilized in libstd)
8191 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8192 (in libcore - previously stabilized in libstd)
8193 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8194 (in libcore - previously stabilized in libstd)
8195 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8196 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8197 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8198 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8203 * [The `thread_local!` macro supports multiple definitions in a single
8204 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8205 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8206 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8207 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8208 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8209 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8210 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8211 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8216 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8217 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8218 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8219 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8220 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8221 and `-vv` prints warnings for all crates.
8222 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8223 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8224 This provides room for expansion by arbitrary tools.
8225 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8226 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8227 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8228 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8229 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8230 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8231 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8236 * [Caching projections speeds up type check dramatically for some
8237 workloads](https://github.com/rust-lang/rust/pull/33816)
8238 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8239 This hasher is faster, but is believed to provide sufficient
8240 protection from collision attacks.
8241 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8246 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8247 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8248 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8249 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8250 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8255 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8256 * [When emitting debug info, rustc emits frame pointers for closures,
8257 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8258 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8259 * Many more errors have been given error codes and extended
8261 * API documentation continues to be improved, with many new examples
8266 * [rustc no longer hangs when dependencies recursively re-export
8267 submodules](https://github.com/rust-lang/rust/pull/34542)
8268 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8269 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8270 rewritten](https://github.com/rust-lang/rust/pull/33895)
8271 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8272 No targets use this yet, but it works toward AVR support.
8277 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8278 * [The new follow-set rules that place restrictions on `macro_rules!`
8279 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8280 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8281 and has been a warning since 1.10.
8282 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8283 This causes breakage in some corner cases.
8286 Version 1.10.0 (2016-07-07)
8287 ===========================
8292 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8293 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8294 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8295 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8296 * [`panic!` can be converted to a runtime abort with the
8297 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8298 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8299 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8300 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8301 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8302 Note that Cargo does not yet directly support cdylibs.
8307 * `os::windows::fs::OpenOptionsExt::access_mode`
8308 * `os::windows::fs::OpenOptionsExt::share_mode`
8309 * `os::windows::fs::OpenOptionsExt::custom_flags`
8310 * `os::windows::fs::OpenOptionsExt::attributes`
8311 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8312 * `os::unix::fs::OpenOptionsExt::custom_flags`
8313 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8314 * `Default for sync::Weak`
8315 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8316 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8317 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8318 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8319 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8320 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8321 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8322 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8323 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8324 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8325 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8326 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8327 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8328 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8329 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8330 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8331 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8332 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8333 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8334 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8335 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8336 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8337 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8338 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8339 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8340 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8341 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8342 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8343 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8344 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8345 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8346 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8347 * Read/Write/RawFd impls for `UnixStream`
8348 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8349 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8350 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8351 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8352 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8353 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8354 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8355 * RawFd impls for `UnixListener`
8356 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8357 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8358 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8359 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8360 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8361 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8362 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8363 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8364 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8365 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8366 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8367 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8368 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8369 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8370 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8371 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8372 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8373 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8374 * RawFd impls for `UnixDatagram`
8375 * `{BTree,Hash}Map::values_mut`
8376 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8381 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8382 The semantics of this minor method are subtle and probably not what
8384 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8385 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8386 will fall back to `/dev/urandom` temporarily to avoid blocking
8387 during early boot](https://github.com/rust-lang/rust/pull/33086).
8388 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8389 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8390 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8391 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8392 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8393 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8394 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8398 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8399 This controls the runtime behavior of the `panic!` macro
8400 and can be either "unwind" (the default), or "abort".
8401 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8402 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8403 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8404 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8405 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8406 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8407 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8408 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8409 By default they are retried twice, which can be customized with the
8410 `net.retry` value in `.cargo/config`.
8411 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8412 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8413 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8414 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8415 Makes it possible to install multiple crates in parallel.
8416 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8417 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8418 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8419 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8420 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8421 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8426 * [rustc memory usage was reduced by refactoring the context used for
8427 type checking](https://github.com/rust-lang/rust/pull/33425).
8428 * [Speed up creation of `HashMap`s by caching the random keys used
8429 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8430 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8431 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8432 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8433 10x faster than the previous lookup tables.
8434 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8439 * Many incremental improvements to documentation and rustdoc.
8440 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8441 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8442 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8443 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8444 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8445 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8446 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8451 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8452 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8453 * [`std` no longer prints backtraces on platforms where the running
8454 module must be loaded with `env::current_exe`, which can't be relied
8455 on](https://github.com/rust-lang/rust/pull/33554).
8456 * This release includes std binaries for the i586-unknown-linux-gnu,
8457 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8458 i586 target is for old x86 hardware without SSE2, and the armv7
8459 target is for Android running on modern ARM architectures.
8460 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8461 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8462 * [On Unix the runtime aborts by calling `libc::abort` instead of
8463 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8464 * [Rust is now bootstrapped from the previous release of Rust,
8465 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8470 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8471 * [`target_env` for Linux ARM targets is just `gnu`, not
8472 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8473 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8474 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8475 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8476 Affects how macros are parsed.
8477 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8478 * [Feature-gated attributes on macro-generated macro invocations are
8479 now rejected](https://github.com/rust-lang/rust/pull/32791).
8480 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8481 This caused some minor changes to type inference.
8484 Version 1.9.0 (2016-05-26)
8485 ==========================
8490 * The `#[deprecated]` attribute when applied to an API will generate
8491 warnings when used. The warnings may be suppressed with
8492 `#[allow(deprecated)]`. [RFC 1270].
8493 * [`fn` item types are zero sized, and each `fn` names a unique
8494 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8495 `transmute` on a `fn` type will generate a warning for a few cycles,
8496 then will be converted to an error.
8497 * [Field and method resolution understand visibility, so private
8498 fields and methods cannot prevent the proper use of public fields
8499 and methods][1.9fv].
8500 * [The parser considers unicode codepoints in the
8501 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8507 * [`std::panic::catch_unwind`] (renamed from `recover`)
8508 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8509 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8510 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8511 * [`str::is_char_boundary`]
8512 * [`<*const T>::as_ref`]
8513 * [`<*mut T>::as_ref`]
8514 * [`<*mut T>::as_mut`]
8515 * [`AsciiExt::make_ascii_uppercase`]
8516 * [`AsciiExt::make_ascii_lowercase`]
8517 * [`char::decode_utf16`]
8518 * [`char::DecodeUtf16`]
8519 * [`char::DecodeUtf16Error`]
8520 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8521 * [`BTreeSet::take`]
8522 * [`BTreeSet::replace`]
8525 * [`HashSet::replace`]
8527 * [`OsString::with_capacity`]
8528 * [`OsString::clear`]
8529 * [`OsString::capacity`]
8530 * [`OsString::reserve`]
8531 * [`OsString::reserve_exact`]
8532 * [`OsStr::is_empty`]
8534 * [`std::os::unix::thread`]
8537 * [`JoinHandleExt::as_pthread_t`]
8538 * [`JoinHandleExt::into_pthread_t`]
8539 * [`HashSet::hasher`]
8540 * [`HashMap::hasher`]
8541 * [`CommandExt::exec`]
8542 * [`File::try_clone`]
8543 * [`SocketAddr::set_ip`]
8544 * [`SocketAddr::set_port`]
8545 * [`SocketAddrV4::set_ip`]
8546 * [`SocketAddrV4::set_port`]
8547 * [`SocketAddrV6::set_ip`]
8548 * [`SocketAddrV6::set_port`]
8549 * [`SocketAddrV6::set_flowinfo`]
8550 * [`SocketAddrV6::set_scope_id`]
8551 * [`slice::copy_from_slice`]
8552 * [`ptr::read_volatile`]
8553 * [`ptr::write_volatile`]
8554 * [`OpenOptions::create_new`]
8555 * [`TcpStream::set_nodelay`]
8556 * [`TcpStream::nodelay`]
8557 * [`TcpStream::set_ttl`]
8558 * [`TcpStream::ttl`]
8559 * [`TcpStream::set_only_v6`]
8560 * [`TcpStream::only_v6`]
8561 * [`TcpStream::take_error`]
8562 * [`TcpStream::set_nonblocking`]
8563 * [`TcpListener::set_ttl`]
8564 * [`TcpListener::ttl`]
8565 * [`TcpListener::set_only_v6`]
8566 * [`TcpListener::only_v6`]
8567 * [`TcpListener::take_error`]
8568 * [`TcpListener::set_nonblocking`]
8569 * [`UdpSocket::set_broadcast`]
8570 * [`UdpSocket::broadcast`]
8571 * [`UdpSocket::set_multicast_loop_v4`]
8572 * [`UdpSocket::multicast_loop_v4`]
8573 * [`UdpSocket::set_multicast_ttl_v4`]
8574 * [`UdpSocket::multicast_ttl_v4`]
8575 * [`UdpSocket::set_multicast_loop_v6`]
8576 * [`UdpSocket::multicast_loop_v6`]
8577 * [`UdpSocket::set_multicast_ttl_v6`]
8578 * [`UdpSocket::multicast_ttl_v6`]
8579 * [`UdpSocket::set_ttl`]
8580 * [`UdpSocket::ttl`]
8581 * [`UdpSocket::set_only_v6`]
8582 * [`UdpSocket::only_v6`]
8583 * [`UdpSocket::join_multicast_v4`]
8584 * [`UdpSocket::join_multicast_v6`]
8585 * [`UdpSocket::leave_multicast_v4`]
8586 * [`UdpSocket::leave_multicast_v6`]
8587 * [`UdpSocket::take_error`]
8588 * [`UdpSocket::connect`]
8589 * [`UdpSocket::send`]
8590 * [`UdpSocket::recv`]
8591 * [`UdpSocket::set_nonblocking`]
8596 * [`std::sync::Once` is poisoned if its initialization function
8598 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8599 * [Most types implement `fmt::Debug`][1.9db].
8600 * [The default buffer size used by `BufReader` and `BufWriter` was
8601 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8602 used by other languages.
8603 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8604 `Duration` additionally implements `*=` and `/=`][1.9ta].
8605 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8606 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8607 * [`Chain` implements `BufRead`][1.9ch].
8608 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8613 * [Cargo can now run concurrently][1.9cc].
8614 * [Top-level overrides allow specific revisions of crates to be
8615 overridden through the entire crate graph][1.9ct]. This is intended
8616 to make upgrades easier for large projects, by allowing crates to be
8617 forked temporarily until they've been upgraded and republished.
8618 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8619 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8620 on the commandline][1.9cf]. `rustc` arguments can also be specified
8621 in the `build.rustflags` configuration key.
8626 * [The time complexity of comparing variables for equivalence during type
8627 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8628 to major compilation time improvement in some scenarios.
8629 * [`ToString` is specialized for `str`, giving it the same performance
8630 as `to_owned`][1.9ts].
8631 * [Spawning processes with `Command::output` no longer creates extra
8633 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8634 for C-like enums][1.9cl].
8639 * [Passing the `--quiet` flag to a test runner will produce
8640 much-abbreviated output][1.9q].
8641 * The Rust Project now publishes std binaries for the
8642 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8643 `i586-pc-windows-msvc` targets.
8648 * [`std::sync::Once` is poisoned if its initialization function
8650 * [It is illegal to define methods with the same name in overlapping
8651 inherent `impl` blocks][1.9sn].
8652 * [`fn` item types are zero sized, and each `fn` names a unique
8653 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8654 `transmute` on a `fn` type will generate a warning for a few cycles,
8655 then will be converted to an error.
8656 * [Improvements to const evaluation may trigger new errors when integer
8657 literals are out of range][1.9ce].
8660 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8661 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8662 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8663 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8664 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8665 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8666 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8667 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8668 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8669 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8670 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8671 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8672 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8673 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8674 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8675 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8676 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8677 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8678 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8679 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8680 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8681 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8682 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8683 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8684 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8685 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8686 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8687 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8688 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8689 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8690 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8691 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8692 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8693 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8694 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8695 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8696 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8697 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8698 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8699 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8700 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8701 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8702 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8703 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8704 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8705 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8706 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8707 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8708 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8709 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8710 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8711 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8712 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8713 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8714 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8715 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8716 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8717 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8718 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8719 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8720 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8721 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8722 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8723 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8724 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8725 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8726 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8727 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8728 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8729 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8730 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8731 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8732 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8733 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8734 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8735 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8736 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8737 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8738 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8739 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8740 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8741 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8742 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8743 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8744 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8745 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8746 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8747 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8748 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8749 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8750 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8751 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8752 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8753 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8754 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8755 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8756 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8757 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8758 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8759 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8760 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8761 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8762 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8763 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8764 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8765 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8766 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8767 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8768 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8769 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8772 Version 1.8.0 (2016-04-14)
8773 ==========================
8778 * Rust supports overloading of compound assignment statements like
8779 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8780 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8781 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8783 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8784 addition to the non-braced form, `struct Foo;`. [RFC 218].
8790 * [`str::encode_utf16`] (renamed from `utf16_units`)
8791 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8794 * [`ptr::drop_in_place`]
8796 * [`time::SystemTime`]
8798 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8799 * [`Instant::elapsed`]
8800 * [`SystemTime::now`]
8801 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8802 * [`SystemTime::elapsed`]
8803 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8804 * [`SystemTimeError`]
8805 * [`SystemTimeError::duration`]
8806 * Various impls for `SystemTimeError`
8808 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8809 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8810 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8811 * [The `write!` and `writeln!` macros correctly emit errors if any of
8812 their arguments can't be formatted][1.8w].
8813 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8814 * [The Unix-specific `raw` modules, which contain a number of
8815 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8816 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8817 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8818 across platforms was making it difficult to implement `std`
8819 correctly. Those that need these definitions should use the `libc`
8821 * The Unix-specific `MetadataExt` traits, including
8822 `os::unix::fs::MetadataExt`, which expose values such as inode
8823 numbers [no longer return platform-specific types][1.8r], but
8824 instead return widened integers. [RFC 1415].
8825 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8826 * [Atomic loads and stores are not volatile][1.8a].
8827 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8832 * [Inlining hash functions lead to a 3% compile-time improvement in
8833 some workloads][1.8h].
8834 * When using jemalloc, its symbols are [unprefixed so that it
8835 overrides the libc malloc implementation][1.8h]. This means that for
8836 rustc, LLVM is now using jemalloc, which results in a 6%
8837 compile-time improvement on a specific workload.
8838 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8843 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8844 i686-pc-windows-msvc is now considered a tier-1 platform.
8845 * [The `--print targets` flag prints a list of supported targets][1.8t].
8846 * [The `--print cfg` flag prints the `cfg`s defined for the current
8848 * [`rustc` can be built with an new Cargo-based build system, written
8849 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8850 build system. To enable it configure with `configure --rustbuild`.
8851 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8852 variants while also indicating the total number of missing variants
8853 if more than 3][1.8m].
8854 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8855 * The Rust Project now publishes binary releases of the standard
8856 library for a number of tier-2 targets:
8857 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8858 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8859 `x86_64-rumprun-netbsd`. These can be installed with
8860 tools such as [multirust][1.8mr].
8865 * [`cargo init` creates a new Cargo project in the current
8866 directory][1.8ci]. It is otherwise like `cargo new`.
8867 * [Cargo has configuration keys for `-v` and
8868 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8869 `[term]` section of `.cargo/config`.
8870 * [Configuration keys that evaluate to strings or integers can be set
8871 via environment variables][1.8ce]. For example the `build.jobs` key
8872 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8873 precedence over config files.
8874 * [Target-specific dependencies support Rust `cfg` syntax for
8875 describing targets][1.8cfg] so that dependencies for multiple
8876 targets can be specified together. [RFC 1361].
8877 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8878 `RUSTDOC` take precedence over the `build.target-dir`,
8879 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8880 * [The child process tree is killed on Windows when Cargo is
8882 * [The `build.target` configuration value sets the target platform,
8883 like `--target`][1.8ct].
8888 * [Unstable compiler flags have been further restricted][1.8u]. Since
8889 1.0 `-Z` flags have been considered unstable, and other flags that
8890 were considered unstable additionally required passing `-Z
8891 unstable-options` to access. Unlike unstable language and library
8892 features though, these options have been accessible on the stable
8893 release channel. Going forward, *new unstable flags will not be
8894 available on the stable release channel*, and old unstable flags
8895 will warn about their usage. In the future, all unstable flags will
8896 be unavailable on the stable release channel.
8897 * [It is no longer possible to `match` on empty enum variants using
8898 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8899 * The Unix-specific `MetadataExt` traits, including
8900 `os::unix::fs::MetadataExt`, which expose values such as inode
8901 numbers [no longer return platform-specific types][1.8r], but
8902 instead return widened integers. [RFC 1415].
8903 * [Modules sourced from the filesystem cannot appear within arbitrary
8904 blocks, but only within other modules][1.8mf].
8905 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8906 * On Unix, [stack overflow triggers a runtime abort instead of a
8908 * [`Command::spawn` and its equivalents return an error if any of
8909 its command-line arguments contain interior `NUL`s][1.8n].
8910 * [Tuple and unit enum variants from other crates are in the type
8912 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8913 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8914 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8915 instead of `foo.lib`.
8918 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8919 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8920 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8921 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8922 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8923 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8924 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8925 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8926 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8927 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8928 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8929 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8930 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8931 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8932 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8933 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8934 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8935 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8936 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8937 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8938 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8939 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8940 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8941 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8942 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8943 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8944 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8945 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8946 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8947 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8948 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8949 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8950 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8951 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8952 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8953 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8954 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8955 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8956 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8957 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8958 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8959 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8960 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8961 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8962 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8963 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8964 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8965 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8966 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8967 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8968 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8969 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8970 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8971 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8972 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8973 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8974 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8975 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8976 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8977 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8980 Version 1.7.0 (2016-03-03)
8981 ==========================
8988 * [`Path::strip_prefix`] (renamed from relative_from)
8989 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8991 * [`Ipv4Addr::is_loopback`]
8992 * [`Ipv4Addr::is_private`]
8993 * [`Ipv4Addr::is_link_local`]
8994 * [`Ipv4Addr::is_multicast`]
8995 * [`Ipv4Addr::is_broadcast`]
8996 * [`Ipv4Addr::is_documentation`]
8998 * [`Ipv6Addr::is_unspecified`]
8999 * [`Ipv6Addr::is_loopback`]
9000 * [`Ipv6Addr::is_multicast`]
9003 * [`Vec::as_mut_slice`]
9005 * [`String::as_str`]
9006 * [`String::as_mut_str`]
9008 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9010 * `<[T]>::`[`sort_by_key`]
9011 * checked, saturated, and overflowing operations
9012 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9013 * [`i32::saturating_mul`]
9014 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9015 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9016 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9017 * [`u32::saturating_mul`]
9018 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9019 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9020 * and checked, saturated, and overflowing operations for other primitive types
9022 * [`ffi::IntoStringError`]
9023 * [`CString::into_string`]
9024 * [`CString::into_bytes`]
9025 * [`CString::into_bytes_with_nul`]
9026 * `From<CString> for Vec<u8>`
9028 * [`IntoStringError::into_cstring`]
9029 * [`IntoStringError::utf8_error`]
9030 * `Error for IntoStringError`
9032 * [`std::hash::BuildHasher`]
9033 * [`BuildHasher::Hasher`]
9034 * [`BuildHasher::build_hasher`]
9035 * [`std::hash::BuildHasherDefault`]
9036 * [`HashMap::with_hasher`]
9037 * [`HashMap::with_capacity_and_hasher`]
9038 * [`HashSet::with_hasher`]
9039 * [`HashSet::with_capacity_and_hasher`]
9040 * [`std::collections::hash_map::RandomState`]
9041 * [`RandomState::new`]
9042 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9043 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9044 from bytes is faster.
9045 * [The performance of `LineWriter` (and thus `io::stdout`) was
9046 improved by using `memchr` to search for newlines][1.7m].
9047 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9048 `f64` variants were stabilized previously.
9049 * [`BTreeMap` was rewritten to use less memory and improve the performance
9050 of insertion and iteration, the latter by as much as 5x][1.7bm].
9051 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9052 covariant over their contained type][1.7bt].
9053 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9054 over their contained type][1.7ll].
9055 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9057 * [`Any` is implemented for unsized types][1.7a].
9058 * [`Hash` is implemented for `Duration`][1.7h].
9063 * [When running tests with `--test`, rustdoc will pass `--cfg`
9064 arguments to the compiler][1.7dt].
9065 * [The compiler is built with RPATH information by default][1.7rpa].
9066 This means that it will be possible to run `rustc` when installed in
9067 unusual configurations without configuring the dynamic linker search
9069 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9070 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9071 over `LD_LIBRARY_PATH`.
9076 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9077 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9078 * [The `rerun-if-changed` build script directive no longer causes the
9079 build script to incorrectly run twice in certain scenarios][1.7rr].
9084 * Soundness fixes to the interactions between associated types and
9085 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9086 code that violates the new rules. This is a significant change that
9087 is known to break existing code, so it has emitted warnings for the
9088 new error cases since 1.4 to give crate authors time to adapt. The
9089 details of what is changing are subtle; read the RFC for more.
9090 * [Several bugs in the compiler's visibility calculations were
9091 fixed][1.7v]. Since this was found to break significant amounts of
9092 code, the new errors will be emitted as warnings for several release
9093 cycles, under the `private_in_public` lint.
9094 * Defaulted type parameters were accidentally accepted in positions
9095 that were not intended. In this release, [defaulted type parameters
9096 appearing outside of type definitions will generate a
9097 warning][1.7d], which will become an error in future releases.
9098 * [Parsing "." as a float results in an error instead of 0][1.7p].
9099 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9100 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9102 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9103 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9104 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9105 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9106 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9107 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9108 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9109 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9110 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9111 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9112 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9113 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9114 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9115 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9116 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9117 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9118 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9119 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9120 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9121 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9122 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9123 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9124 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9125 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9126 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9127 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9128 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9129 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9130 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9131 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9132 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9133 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9134 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9135 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9136 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9137 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9138 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9139 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9140 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9141 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9142 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9143 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9144 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9145 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9146 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9147 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9148 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9149 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9150 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9151 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9152 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9153 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9154 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9155 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9156 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9157 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9158 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9159 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9160 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9161 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9162 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9163 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9164 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9165 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9166 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9167 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9168 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9169 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9170 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9171 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9172 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9173 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9174 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9175 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9176 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9177 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9178 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9179 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9180 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9183 Version 1.6.0 (2016-01-21)
9184 ==========================
9189 * The `#![no_std]` attribute causes a crate to not be linked to the
9190 standard library, but only the [core library][1.6co], as described
9191 in [RFC 1184]. The core library defines common types and traits but
9192 has no platform dependencies whatsoever, and is the basis for Rust
9193 software in environments that cannot support a full port of the
9194 standard library, such as operating systems. Most of the core
9195 library is now stable.
9201 [`Read::read_exact`],
9202 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9203 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9204 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9205 [`os::unix::fs::DirBuilderExt`],
9206 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9207 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9208 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9209 [`collections::hash_map::Drain`],
9210 [`collections::hash_map::HashMap::drain`],
9211 [`collections::hash_set::Drain`],
9212 [`collections::hash_set::HashSet::drain`],
9213 [`collections::binary_heap::Drain`],
9214 [`collections::binary_heap::BinaryHeap::drain`],
9215 [`Vec::extend_from_slice`] (renamed from `push_all`),
9216 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9217 [`RwLock::into_inner`],
9218 [`Iterator::min_by_key`] (renamed from `min_by`),
9219 [`Iterator::max_by_key`] (renamed from `max_by`).
9220 * The [core library][1.6co] is stable, as are most of its APIs.
9221 * [The `assert_eq!` macro supports arguments that don't implement
9222 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9224 * Several timer functions that take duration in milliseconds [are
9225 deprecated in favor of those that take `Duration`][1.6ms]. These
9226 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9227 `thread::park_timeout_ms`.
9228 * The algorithm by which `Vec` reserves additional elements was
9229 [tweaked to not allocate excessive space][1.6a] while still growing
9231 * `From` conversions are [implemented from integers to floats][1.6f]
9232 in cases where the conversion is lossless. Thus they are not
9233 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9234 or `f64`. They are also not implemented for `isize` and `usize`
9235 because the implementations would be platform-specific. `From` is
9236 also implemented from `f32` to `f64`.
9237 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9238 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9239 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9240 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9242 * Sorting slices that are already sorted [is 50% faster in some
9248 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9249 * Cargo build scripts can specify their dependencies by emitting the
9250 [`rerun-if-changed`][1.6rr] key.
9251 * crates.io will reject publication of crates with dependencies that
9252 have a wildcard version constraint. Crates with wildcard
9253 dependencies were seen to cause a variety of problems, as described
9254 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9256 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9257 release folder. A variety of artifacts that Cargo failed to clean
9258 are now correctly deleted.
9263 * The `unreachable_code` lint [warns when a function call's argument
9265 * The parser indicates [failures that may be caused by
9266 confusingly-similar Unicode characters][1.6uc]
9267 * Certain macro errors [are reported at definition time][1.6m], not
9273 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9274 environment variable when locating crates. This was a pre-cargo
9275 feature for integrating with the package manager that was
9276 accidentally never removed.
9277 * [A number of bugs were fixed in the privacy checker][1.6p] that
9278 could cause previously-accepted code to break.
9279 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9280 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9281 struct pattern syntax (`Foo(..)`) can no longer be used to match
9282 unit structs. This is a warning now, but will become an error in
9283 future releases. Patterns that share the same name as a const are
9285 * A bug was fixed that causes [rustc not to apply default type
9286 parameters][1.6xc] when resolving certain method implementations of
9287 traits defined in other crates.
9289 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9290 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9291 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9292 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9293 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9294 [1.6co]: http://doc.rust-lang.org/core/index.html
9295 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9296 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9297 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9298 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9299 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9300 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9301 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9302 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9303 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9304 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9305 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9306 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9307 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9308 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9309 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9310 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9311 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9312 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9313 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9314 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9315 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9316 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9317 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9318 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9319 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9320 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9321 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9322 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9323 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9324 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9325 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9326 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9327 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9328 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9329 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9330 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9331 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9332 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9333 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9334 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9335 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9338 Version 1.5.0 (2015-12-10)
9339 ==========================
9341 * ~700 changes, numerous bugfixes
9347 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9348 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9349 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9350 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9351 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9352 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9353 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9354 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9355 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9356 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9357 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9358 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9359 [`Path::read_link`], [`Path::symlink_metadata`],
9360 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9361 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9362 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9363 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9364 [`slice::split_first_mut`], [`slice::split_first`],
9365 [`slice::split_last_mut`], [`slice::split_last`],
9366 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9367 [`str::MatchIndices`], [`str::RMatchIndices`],
9368 [`str::match_indices`], [`str::rmatch_indices`],
9369 [`str::slice_mut_unchecked`], [`string::ParseError`].
9370 * Rust applications hosted on crates.io can be installed locally to
9371 `~/.cargo/bin` with the [`cargo install`] command. Among other
9372 things this makes it easier to augment Cargo with new subcommands:
9373 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9374 invoked as `cargo foo`.
9375 * Crates with wildcard (`*`) dependencies will [emit warnings when
9376 published][1.5w]. In 1.6 it will no longer be possible to publish
9377 crates with wildcard dependencies.
9382 * The rules determining when a particular lifetime must outlive
9383 a particular value (known as '[dropck]') have been [modified
9384 to not rely on parametricity][1.5p].
9385 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9386 and `Arc`][1.5a]. Because these smart pointer types implement
9387 `Deref`, this causes breakage in cases where the interior type
9388 contains methods of the same name.
9389 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9390 that they could drop their content. Soundness fix.
9391 * All method invocations are [properly checked][1.5wf1] for
9392 [well-formedness][1.5wf2]. Soundness fix.
9393 * Traits whose supertraits contain `Self` are [not object
9394 safe][1.5o]. Soundness fix.
9395 * Target specifications support a [`no_default_libraries`][1.5nd]
9396 setting that controls whether `-nodefaultlibs` is passed to the
9397 linker, and in turn the `is_like_windows` setting no longer affects
9398 the `-nodefaultlibs` flag.
9399 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9400 * The `#[inline]` and `#[repr]` attributes [can only appear
9401 in valid locations][1.5at].
9402 * Native libraries linked from the local crate are [passed to
9403 the linker before native libraries from upstream crates][1.5nl].
9404 * Two rarely-used attributes, `#[no_debug]` and
9405 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9406 * Negation of unsigned integers, which has been a warning for
9407 several releases, [is now behind a feature gate and will
9408 generate errors][1.5nu].
9409 * The parser accidentally accepted visibility modifiers on
9410 enum variants, a bug [which has been fixed][1.5ev].
9411 * [A bug was fixed that allowed `use` statements to import unstable
9417 * When evaluating expressions at compile-time that are not
9418 compile-time constants (const-evaluating expressions in non-const
9419 contexts), incorrect code such as overlong bitshifts and arithmetic
9420 overflow will [generate a warning instead of an error][1.5ce],
9421 delaying the error until runtime. This will allow the
9422 const-evaluator to be expanded in the future backwards-compatibly.
9423 * The `improper_ctypes` lint [no longer warns about using `isize` and
9424 `usize` in FFI][1.5ict].
9429 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9431 * `Default` is [implemented for mutable slices][1.5d].
9432 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9433 * There are now `From` conversions [between floating point
9434 types][1.5f] where the conversions are lossless.
9435 * There are now `From` conversions [between integer types][1.5i] where
9436 the conversions are lossless.
9437 * [`fs::Metadata` implements `Clone`][1.5fs].
9438 * The `parse` method [accepts a leading "+" when parsing
9440 * [`AsMut` is implemented for `Vec`][1.5am].
9441 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9442 been optimized][1.5cf] and no longer rely on the default impl.
9443 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9444 `unsafe extern "C"` function types now [implement `Clone`,
9445 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9446 `fmt::Debug` for up to 12 arguments][1.5fp].
9447 * [Dropping `Vec`s is much faster in unoptimized builds when the
9448 element types don't implement `Drop`][1.5dv].
9449 * A bug that caused in incorrect behavior when [combining `VecDeque`
9450 with zero-sized types][1.5vdz] was resolved.
9451 * [`PartialOrd` for slices is faster][1.5po].
9456 * [Crate metadata size was reduced by 20%][1.5md].
9457 * [Improvements to code generation reduced the size of libcore by 3.3
9458 MB and rustc's memory usage by 18MB][1.5m].
9459 * [Improvements to deref translation increased performance in
9460 unoptimized builds][1.5dr].
9461 * Various errors in trait resolution [are deduplicated to only be
9462 reported once][1.5te].
9463 * Rust has preliminary [support for rumprun kernels][1.5rr].
9464 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9466 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9467 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9468 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9469 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9470 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9471 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9472 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9473 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9474 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9475 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9476 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9477 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9478 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9479 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9480 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9481 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9482 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9483 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9484 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9485 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9486 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9487 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9488 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9489 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9490 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9491 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9492 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9493 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9494 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9495 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9496 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9497 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9498 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9499 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9500 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9501 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9502 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9503 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9504 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9505 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9506 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9507 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9508 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9509 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9510 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9511 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9512 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9513 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9514 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9515 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9516 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9517 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9518 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9519 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9520 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9521 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9522 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9523 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9524 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9525 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9526 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9527 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9528 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9529 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9530 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9531 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9532 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9533 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9534 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9535 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9536 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9537 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9538 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9539 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9540 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9541 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9542 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9543 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9544 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9545 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9546 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9547 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9548 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9549 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9550 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9551 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9552 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9553 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9554 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9556 Version 1.4.0 (2015-10-29)
9557 ==========================
9559 * ~1200 changes, numerous bugfixes
9564 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9565 GNU) are now supported and recommended for use.
9570 * [Several changes have been made to fix type soundness and improve
9571 the behavior of associated types][sound]. See [RFC 1214]. Although
9572 we have mostly introduced these changes as warnings this release, to
9573 become errors next release, there are still some scenarios that will
9574 see immediate breakage.
9575 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9576 line breaks in addition to `\n`][crlf].
9577 * [Loans of `'static` lifetime extend to the end of a function][stat].
9578 * [`str::parse` no longer introduces avoidable rounding error when
9579 parsing floating point numbers. Together with earlier changes to
9580 float formatting/output, "round trips" like f.to_string().parse()
9581 now preserve the value of f exactly. Additionally, leading plus
9582 signs are now accepted][fp3].
9588 * `use` statements that import multiple items [can now rename
9589 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9590 * [Binops work correctly on fat pointers][binfat].
9591 * `pub extern crate`, which does not behave as expected, [issues a
9592 warning][pec] until a better solution is found.
9597 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9598 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9599 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9600 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9601 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9602 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9603 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9604 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9605 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9606 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9607 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9608 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9609 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9610 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9611 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9612 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9613 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9614 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9616 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9617 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9618 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9619 `f64::from_str_radix`.
9620 * [Reverse-searching strings is faster with the 'two-way'
9622 * [`std::io::copy` allows `?Sized` arguments][cc].
9623 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9624 [override `count`, `nth` and `last` with an *O*(1)
9625 implementation][it].
9626 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9627 * [`IntoRawFd` has been added to the Unix-specific prelude,
9628 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9630 * [`Extend<String>` and `FromIterator<String` are both implemented for
9632 * [`IntoIterator` is implemented for references to `Option` and
9634 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9635 Copy`][ext] as part of [RFC 839]. This will cause type inference
9636 breakage in rare situations.
9637 * [`BinaryHeap` implements `Debug`][bh2].
9638 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9640 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9641 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9642 * [String comparison is faster][faststr].
9643 * `&mut T` where `T: std::fmt::Write` [also implements
9644 `std::fmt::Write`][mutw].
9645 * [A stable regression in `VecDeque::push_back` and other
9646 capacity-altering methods that caused panics for zero-sized types
9648 * [Function pointers implement traits for up to 12 parameters][fp2].
9653 * The compiler [no longer uses the 'morestack' feature to prevent
9654 stack overflow][mm]. Instead it uses guard pages and stack
9655 probes (though stack probes are not yet implemented on any platform
9657 * [The compiler matches traits faster when projections are involved][p].
9658 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9660 * [Cargo now displays useful information about what its doing during
9661 `cargo update`][cu].
9663 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9664 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9665 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9666 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9667 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9668 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9669 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9670 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9671 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9672 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9673 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9674 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9675 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9676 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9677 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9678 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9679 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9680 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9681 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9682 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9683 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9684 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9685 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9686 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9687 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9688 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9689 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9690 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9691 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9692 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9693 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9694 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9695 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9696 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9697 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9698 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9699 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9700 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9701 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9702 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9703 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9704 [bh2]: https://github.com/rust-lang/rust/pull/28156
9705 [binfat]: https://github.com/rust-lang/rust/pull/28270
9706 [bm]: https://github.com/rust-lang/rust/pull/28197
9707 [cc]: https://github.com/rust-lang/rust/pull/27531
9708 [crlf]: https://github.com/rust-lang/rust/pull/28034
9709 [cu]: https://github.com/rust-lang/cargo/pull/1931
9710 [d]: https://github.com/rust-lang/rust/pull/27825
9711 [dep]: https://github.com/rust-lang/rust/pull/28339
9712 [es]: https://github.com/rust-lang/rust/pull/27956
9713 [ext]: https://github.com/rust-lang/rust/pull/28094
9714 [faststr]: https://github.com/rust-lang/rust/pull/28338
9715 [ffi]: https://github.com/rust-lang/rust/pull/28779
9716 [fp]: https://github.com/rust-lang/rust/pull/28268
9717 [fp2]: https://github.com/rust-lang/rust/pull/28560
9718 [fp3]: https://github.com/rust-lang/rust/pull/27307
9719 [i]: https://github.com/rust-lang/rust/pull/27451
9720 [into2]: https://github.com/rust-lang/rust/pull/28039
9721 [it]: https://github.com/rust-lang/rust/pull/27652
9722 [mm]: https://github.com/rust-lang/rust/pull/27338
9723 [mutw]: https://github.com/rust-lang/rust/pull/28368
9724 [sound]: https://github.com/rust-lang/rust/pull/27641
9725 [p]: https://github.com/rust-lang/rust/pull/27866
9726 [pec]: https://github.com/rust-lang/rust/pull/28486
9727 [pr]: https://github.com/rust-lang/rust/pull/27896
9728 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9729 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9730 [s]: https://github.com/rust-lang/rust/pull/27474
9731 [stab]: https://github.com/rust-lang/rust/pull/28339
9732 [stat]: https://github.com/rust-lang/rust/pull/28321
9733 [vd]: https://github.com/rust-lang/rust/pull/28494
9735 Version 1.3.0 (2015-09-17)
9736 ==============================
9738 * ~900 changes, numerous bugfixes
9743 * The [new object lifetime defaults][nold] have been [turned
9744 on][nold2] after a cycle of warnings about the change. Now types
9745 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9746 being interpreted as `&'a Box<Trait+'a>` to `&'a
9747 Box<Trait+'static>`.
9748 * [The Rustonomicon][nom] is a new book in the official documentation
9749 that dives into writing unsafe Rust.
9750 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9751 timekeeping is employed by other std APIs, as well as out-of-tree
9757 * The [new object lifetime defaults][nold] have been [turned
9758 on][nold2] after a cycle of warnings about the change.
9759 * There is a known [regression][lr] in how object lifetime elision is
9760 interpreted, the proper solution for which is undetermined.
9761 * The `#[prelude_import]` attribute, an internal implementation
9762 detail, was accidentally stabilized previously. [It has been put
9763 behind the `prelude_import` feature gate][pi]. This change is
9764 believed to break no existing code.
9765 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9766 [more sane for dynamically sized types][dst3]. Code that relied on
9767 the previous behavior is thought to be broken.
9768 * The `dropck` rules, which checks that destructors can't access
9769 destroyed values, [have been updated][dropck] to match the
9770 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9771 cause some previously-compiling code to no longer build.
9776 * The [new object lifetime defaults][nold] have been [turned
9777 on][nold2] after a cycle of warnings about the change.
9778 * Semicolons may [now follow types and paths in
9779 macros](https://github.com/rust-lang/rust/pull/27000).
9780 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9781 [more sane for dynamically sized types][dst3]. Code that relied on
9782 the previous behavior is not known to exist, and suspected to be
9784 * `'static` variables [may now be recursive][st].
9785 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9786 implementations correctly.
9787 * The `dropck` rules, which checks that destructors can't access
9788 destroyed values, [have been updated][dropck] to match the
9794 * The [`Duration`] API, [has been stabilized][ds], as well as the
9795 `std::time` module, which presently contains only `Duration`.
9796 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9797 * The owned C string, [`CString`], implements [`Borrow`] and the
9798 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9799 these allow C strings to be borrowed and cloned in generic code.
9800 * [`CStr`] implements [`Debug`].
9801 * [`AtomicPtr`] implements [`Debug`].
9802 * [`Error`] trait objects [can be downcast to their concrete types][e]
9803 in many common configurations, using the [`is`], [`downcast`],
9804 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9806 * Searching for substrings now [employs the two-way algorithm][search]
9807 instead of doing a naive search. This gives major speedups to a
9808 number of methods, including [`contains`][sc], [`find`][sf],
9809 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9810 [`ends_with`][sew] are also faster.
9811 * The performance of `PartialEq` for slices is [much faster][ps].
9812 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9813 is overridden and optimized by the implementations for scalars.
9814 * The [`Hasher`] trait now has a number of specialized `write_*`
9815 methods for primitive types, for efficiency.
9816 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9817 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9818 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9819 of [`std::error::Error::cause`][iec] also delegates to the inner
9821 * [`process::Child`][pc] gained the [`id`] method, which returns a
9822 `u32` representing the platform-specific process identifier.
9823 * The [`connect`] method on slices is deprecated, replaced by the new
9824 [`join`] method (note that both of these are on the *unstable*
9825 [`SliceConcatExt`] trait, but through the magic of the prelude are
9826 available to stable code anyway).
9827 * The [`Div`] operator is implemented for [`Wrapping`] types.
9828 * [`DerefMut` is implemented for `String`][dms].
9829 * Performance of SipHash (the default hasher for `HashMap`) is
9830 [better for long data][sh].
9831 * [`AtomicPtr`] implements [`Send`].
9832 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9833 are now [specialized to use uninitialized buffers for increased
9835 * Lifetime parameters of foreign functions [are now resolved
9841 * Rust can now, with some coercion, [produce programs that run on
9842 Windows XP][xp], though XP is not considered a supported platform.
9843 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9844 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9845 recommended for use in 1.3, though should be fully-functional
9846 in the [64-bit 1.4 beta][b14].
9847 * On Fedora-based systems installation will [properly configure the
9848 dynamic linker][fl].
9849 * The compiler gained many new extended error descriptions, which can
9850 be accessed with the `--explain` flag.
9851 * The `dropck` pass, which checks that destructors can't access
9852 destroyed values, [has been rewritten][27261]. This fixes some
9853 soundness holes, and as such will cause some previously-compiling
9854 code to no longer build.
9855 * `rustc` now uses [LLVM to write archive files where possible][ar].
9856 Eventually this will eliminate the compiler's dependency on the ar
9858 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9859 supported FreeBSD on x86_64).
9860 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9861 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9863 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9864 will kill the process instead of leaking][nlp].
9866 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9867 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9868 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9869 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9870 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9871 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9872 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9873 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9874 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9875 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9876 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9877 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9878 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9879 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9880 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9881 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9882 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9883 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9884 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9885 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9886 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9887 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9888 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9889 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9890 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9891 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9892 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9893 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9894 [ar]: https://github.com/rust-lang/rust/pull/26926
9895 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9896 [dms]: https://github.com/rust-lang/rust/pull/26241
9897 [27261]: https://github.com/rust-lang/rust/pull/27261
9898 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9899 [ds]: https://github.com/rust-lang/rust/pull/26818
9900 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9901 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9902 [dst3]: https://github.com/rust-lang/rust/pull/27351
9903 [e]: https://github.com/rust-lang/rust/pull/24793
9904 [f]: https://github.com/rust-lang/rust/pull/26588
9905 [26959]: https://github.com/rust-lang/rust/pull/26959
9906 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9907 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9908 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9909 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9910 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9911 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9912 [lic]: https://github.com/rust-lang/rust/pull/26583
9913 [lnu]: https://github.com/rust-lang/rust/pull/27026
9914 [lr]: https://github.com/rust-lang/rust/issues/27248
9915 [lum]: https://github.com/rust-lang/rust/pull/26378
9916 [lur]: https://github.com/rust-lang/rust/pull/26783
9917 [nlp]: https://github.com/rust-lang/rust/pull/27176
9918 [nold2]: https://github.com/rust-lang/rust/pull/27045
9919 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9920 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9921 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9922 [pi]: https://github.com/rust-lang/rust/pull/26699
9923 [ps]: https://github.com/rust-lang/rust/pull/26884
9924 [rte]: https://github.com/rust-lang/rust/pull/26950
9925 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9926 [search]: https://github.com/rust-lang/rust/pull/26327
9927 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9928 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9929 [sh]: https://github.com/rust-lang/rust/pull/27280
9930 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9931 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9932 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9933 [st]: https://github.com/rust-lang/rust/pull/26630
9934 [win1]: https://github.com/rust-lang/rust/pull/26569
9935 [win2]: https://github.com/rust-lang/rust/pull/26741
9936 [win3]: https://github.com/rust-lang/rust/pull/26741
9937 [win4]: https://github.com/rust-lang/rust/pull/27210
9938 [xp]: https://github.com/rust-lang/rust/pull/26569
9940 Version 1.2.0 (2015-08-07)
9941 ==========================
9943 * ~1200 changes, numerous bugfixes
9948 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9949 like `Rc` to contain types without a fixed size, arrays and trait
9950 objects, finally enabling use of `Rc<[T]>` and completing the
9951 implementation of DST.
9952 * [Parallel codegen][parcodegen] is now working again, which can
9953 substantially speed up large builds in debug mode; It also gets
9954 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9955 jobs). It's not enabled by default, but will be "in the near
9956 future". It can be activated with the `-C codegen-units=N` flag to
9958 * This is the first release with [experimental support for linking
9959 with the MSVC linker and lib C on Windows (instead of using the GNU
9960 variants via MinGW)][win]. It is yet recommended only for the most
9961 intrepid Rustaceans.
9962 * Benchmark compilations are showing a 30% improvement in
9963 bootstrapping over 1.1.
9968 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9969 unicode case mapping, which is a previously-planned change in
9970 behavior and considered a bugfix.
9971 * [`mem::align_of`] now specifies [the *minimum alignment* for
9972 T][align], which is usually the alignment programs are interested
9973 in, and the same value reported by clang's
9974 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9976 * [The `#[packed]` attribute is no longer silently accepted by the
9977 compiler][packed]. This attribute did nothing and code that
9978 mentioned it likely did not work as intended.
9979 * Associated type defaults are [now behind the
9980 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9981 defaults *did not work*, but could be mentioned syntactically. As
9982 such this breakage has minimal impact.
9987 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9988 matching against dereferenceable values.
9993 * The [`Extend`] trait, which grows a collection from an iterator, is
9994 implemented over iterators of references, for `String`, `Vec`,
9995 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9996 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9997 * The [`iter::once`] function returns an iterator that yields a single
9998 element, and [`iter::empty`] returns an iterator that yields no
10000 * The [`matches`] and [`rmatches`] methods on `str` return iterators
10001 over substring matches.
10002 * [`Cell`] and [`RefCell`] both implement `Eq`.
10003 * A number of methods for wrapping arithmetic are added to the
10004 integral types, [`wrapping_div`], [`wrapping_rem`],
10005 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10006 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10007 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10008 type.. It is illegal for the default arithmetic operations in Rust
10009 to overflow; the desire to wrap must be explicit.
10010 * The `{:#?}` formatting specifier [displays the alternate,
10011 pretty-printed][debugfmt] form of the `Debug` formatter. This
10012 feature was actually introduced prior to 1.0 with little
10014 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10015 for writing data to formatted strings, similar to [`io::Write`].
10016 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10017 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10018 are used by code generators to emit implementations of [`Debug`].
10019 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10020 methods that convert case, following Unicode case mapping.
10021 * It is now easier to handle poisoned locks. The [`PoisonError`]
10022 type, returned by failing lock operations, exposes `into_inner`,
10023 `get_ref`, and `get_mut`, which all give access to the inner lock
10024 guard, and allow the poisoned lock to continue to operate. The
10025 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10026 poisoned lock without attempting to take the lock.
10027 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10028 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10029 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10030 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10032 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10038 * `rustc` employs smarter heuristics for guessing at [typos].
10039 * `rustc` emits more efficient code for [no-op conversions between
10040 unsafe pointers][nop].
10041 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10042 resulting in faster compile times and smaller code.
10044 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10045 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10046 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10047 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10048 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10049 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10050 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10051 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10052 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10053 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10054 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10055 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10056 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10057 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10058 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10059 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10060 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10061 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10062 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10063 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10064 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10065 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10066 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10067 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10068 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10069 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10070 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10071 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10072 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10073 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10074 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10075 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10076 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10077 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10078 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10079 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10080 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10081 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10082 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10083 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10084 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10085 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10086 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10087 [align]: https://github.com/rust-lang/rust/pull/25646
10088 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10089 [typos]: https://github.com/rust-lang/rust/pull/26087
10090 [nop]: https://github.com/rust-lang/rust/pull/26336
10091 [fat]: https://github.com/rust-lang/rust/pull/26411
10092 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10093 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10094 [packed]: https://github.com/rust-lang/rust/pull/25541
10095 [ad]: https://github.com/rust-lang/rust/pull/27382
10096 [win]: https://github.com/rust-lang/rust/pull/25350
10098 Version 1.1.0 (2015-06-25)
10099 =========================
10101 * ~850 changes, numerous bugfixes
10106 * The [`std::fs` module has been expanded][fs] to expand the set of
10107 functionality exposed:
10108 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10109 don't incur a syscall on some platforms.
10110 * A `symlink_metadata` function has been added.
10111 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10112 access to all underlying information.
10113 * The compiler now contains extended explanations of many errors. When an error
10114 with an explanation occurs the compiler suggests using the `--explain` flag
10115 to read the explanation. Error explanations are also [available online][err-index].
10116 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10117 well as other work, the time to bootstrap the compiler decreased by
10123 * The [`str::split_whitespace`] method splits a string on unicode
10124 whitespace boundaries.
10125 * On both Windows and Unix, new extension traits provide conversion of
10126 I/O types to and from the underlying system handles. On Unix, these
10127 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10128 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10129 `TcpListener`, and `UpdSocket`. Further implementations for
10130 `std::process` will be stabilized later.
10131 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10132 Windows, symlinks can be created with
10133 `std::os::windows::symlink_dir` and
10134 `std::os::windows::symlink_file`.
10135 * The `mpsc::Receiver` type can now be converted into an iterator with
10136 `into_iter` on the [`IntoIterator`] trait.
10137 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10138 implementation of the [`From`] trait.
10139 * The `Debug` implementation for `RangeFull` [creates output that is
10140 more consistent with other implementations][rf].
10141 * [`Debug` is implemented for `File`][file].
10142 * The `Default` implementation for `Arc` [no longer requires `Sync +
10144 * [The `Iterator` methods `count`, `nth`, and `last` have been
10145 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10146 * Incorrect handling of paths on Windows has been improved in both the
10147 compiler and the standard library.
10148 * [`AtomicPtr` gained a `Default` implementation][ap].
10149 * In accordance with Rust's policy on arithmetic overflow `abs` now
10150 [panics on overflow when debug assertions are enabled][abs].
10151 * The [`Cloned`] iterator, which was accidentally left unstable for
10152 1.0 [has been stabilized][c].
10153 * The [`Incoming`] iterator, which iterates over incoming TCP
10154 connections, and which was accidentally unnamable in 1.0, [is now
10155 properly exported][inc].
10156 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10157 `sift_up` or `sift_down` panic][bh].
10158 * The [`split_off`] method of `LinkedList` [no longer corrupts
10159 the list in certain scenarios][ll].
10164 * Type checking performance [has improved notably][sk] with
10165 [multiple improvements][pre].
10166 * The compiler [suggests code changes][ch] for more errors.
10167 * rustc and it's build system have experimental support for [building
10168 toolchains against MUSL][m] instead of glibc on Linux.
10169 * The compiler defines the `target_env` cfg value, which is used for
10170 distinguishing toolchains that are otherwise for the same
10171 platform. Presently this is set to `gnu` for common GNU Linux
10172 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10173 * The [`cargo rustc`][crc] command invokes a build with custom flags
10175 * [Android executables are always position independent][pie].
10176 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10177 with `Drop`][24935].
10179 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10180 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10181 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10182 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10183 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10184 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10185 [rf]: https://github.com/rust-lang/rust/pull/24491
10186 [err-index]: https://doc.rust-lang.org/error-index.html
10187 [sk]: https://github.com/rust-lang/rust/pull/24615
10188 [pre]: https://github.com/rust-lang/rust/pull/25323
10189 [file]: https://github.com/rust-lang/rust/pull/24598
10190 [ch]: https://github.com/rust-lang/rust/pull/24683
10191 [arc]: https://github.com/rust-lang/rust/pull/24695
10192 [si]: https://github.com/rust-lang/rust/pull/24701
10193 [ap]: https://github.com/rust-lang/rust/pull/24834
10194 [m]: https://github.com/rust-lang/rust/pull/24777
10195 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10196 [crc]: https://github.com/rust-lang/cargo/pull/1568
10197 [pie]: https://github.com/rust-lang/rust/pull/24953
10198 [abs]: https://github.com/rust-lang/rust/pull/25441
10199 [c]: https://github.com/rust-lang/rust/pull/25496
10200 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10201 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10202 [inc]: https://github.com/rust-lang/rust/pull/25522
10203 [bh]: https://github.com/rust-lang/rust/pull/25856
10204 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10205 [ll]: https://github.com/rust-lang/rust/pull/26022
10206 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10207 [24935]: https://github.com/rust-lang/rust/pull/24935
10209 Version 1.0.0 (2015-05-15)
10210 ========================
10212 * ~1500 changes, numerous bugfixes
10217 * The vast majority of the standard library is now `#[stable]`. It is
10218 no longer possible to use unstable features with a stable build of
10220 * Many popular crates on [crates.io] now work on the stable release
10222 * Arithmetic on basic integer types now [checks for overflow in debug
10228 * Several [restrictions have been added to trait coherence][coh] in
10229 order to make it easier for upstream authors to change traits
10230 without breaking downstream code.
10231 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10232 improve error messages and macro behavior. For example, `0b1234` is
10233 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10234 * Trait bounds [are always invariant][inv], eliminating the need for
10235 the `PhantomFn` and `MarkerTrait` lang items, which have been
10237 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10238 "foo" as bar` syntax has been replaced with `extern crate foo as
10239 bar`, and Cargo now automatically translates "-" in *package* names
10240 to underscore for the crate name.
10241 * [Lifetime shadowing is an error][lt].
10242 * [`Send` no longer implies `'static`][send-rfc].
10243 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10244 `MyType::default()`.
10245 * Primitive types [now have inherent methods][prim-inherent],
10246 obviating the need for extension traits like `SliceExt`.
10247 * Methods with `Self: Sized` in their `where` clause are [considered
10248 object-safe][self-sized], allowing many extension traits like
10249 `IteratorExt` to be merged into the traits they extended.
10250 * You can now [refer to associated types][assoc-where] whose
10251 corresponding trait bounds appear only in a `where` clause.
10252 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10253 like `Send` and `Sync` are now library-defined.
10254 * A [Reflect trait][reflect] was introduced, which means that
10255 downcasting via the `Any` trait is effectively limited to concrete
10256 types. This helps retain the potentially-important "parametricity"
10257 property: generic code cannot behave differently for different type
10258 arguments except in minor ways.
10259 * The `unsafe_destructor` feature is now deprecated in favor of the
10260 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10266 * The `thread_local` module [has been renamed to `std::thread`][th].
10267 * The methods of `IteratorExt` [have been moved to the `Iterator`
10268 trait itself][23300].
10269 * Several traits that implement Rust's conventions for type
10270 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10271 [centralized in the `std::convert` module][con].
10272 * The `FromError` trait [was removed in favor of `From`][fe].
10273 * The basic sleep function [has moved to
10274 `std::thread::sleep_ms`][slp].
10275 * The `splitn` function now takes an `n` parameter that represents the
10276 number of items yielded by the returned iterator [instead of the
10277 number of 'splits'][spl].
10278 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10279 * [Derived implementations of `PartialOrd` now order enums according
10280 to their explicitly-assigned discriminants][po].
10281 * [Methods for searching strings are generic over `Pattern`s][pat],
10282 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10284 * [In method resolution, object methods are resolved before inherent
10286 * [`String::from_str` has been deprecated in favor of the `From` impl,
10287 `String::from`][24517].
10288 * [`io::Error` implements `Sync`][ios].
10289 * [The `words` method on `&str` has been replaced with
10290 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10292 * The new path and IO modules are complete and `#[stable]`. This
10293 was the major library focus for this cycle.
10294 * The path API was [revised][path-normalize] to normalize `.`,
10295 adjusting the tradeoffs in favor of the most common usage.
10296 * A large number of remaining APIs in `std` were also stabilized
10297 during this cycle; about 75% of the non-deprecated API surface
10299 * The new [string pattern API][string-pattern] landed, which makes
10300 the string slice API much more internally consistent and flexible.
10301 * A new set of [generic conversion traits][conversion] replaced
10302 many existing ad hoc traits.
10303 * Generic numeric traits were [completely removed][num-traits]. This
10304 was made possible thanks to inherent methods for primitive types,
10305 and the removal gives maximal flexibility for designing a numeric
10306 hierarchy in the future.
10307 * The `Fn` traits are now related via [inheritance][fn-inherit]
10308 and provide ergonomic [blanket implementations][fn-blanket].
10309 * The `Index` and `IndexMut` traits were changed to
10310 [take the index by value][index-value], enabling code like
10311 `hash_map["string"]` to work.
10312 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10313 `Copy` data is known to be `Clone` as well.
10318 * Many errors now have extended explanations that can be accessed with
10319 the `--explain` flag to `rustc`.
10320 * Many new examples have been added to the standard library
10322 * rustdoc has received a number of improvements focused on completion
10324 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10325 * Much headway was made on ecosystem-wide CI, making it possible
10326 to [compare builds for breakage][ci-compare].
10329 [crates.io]: http://crates.io
10330 [clo]: https://github.com/rust-lang/rust/pull/24034
10331 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10332 [con]: https://github.com/rust-lang/rust/pull/23875
10333 [cr]: https://github.com/rust-lang/rust/pull/23419
10334 [fe]: https://github.com/rust-lang/rust/pull/23879
10335 [23300]: https://github.com/rust-lang/rust/pull/23300
10336 [inv]: https://github.com/rust-lang/rust/pull/23938
10337 [ios]: https://github.com/rust-lang/rust/pull/24133
10338 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10339 [lt]: https://github.com/rust-lang/rust/pull/24057
10340 [meth]: https://github.com/rust-lang/rust/pull/24056
10341 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10342 [po]: https://github.com/rust-lang/rust/pull/24270
10343 [24517]: https://github.com/rust-lang/rust/pull/24517
10344 [slp]: https://github.com/rust-lang/rust/pull/23949
10345 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10346 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10347 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10348 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10349 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10350 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10351 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10352 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10353 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10354 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10355 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10356 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10357 [reflect]: https://github.com/rust-lang/rust/pull/23712
10358 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10359 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10360 [index-value]: https://github.com/rust-lang/rust/pull/23601
10361 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10362 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10363 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10364 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10365 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10366 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10369 Version 1.0.0-alpha.2 (2015-02-20)
10370 =====================================
10372 * ~1300 changes, numerous bugfixes
10376 * The various I/O modules were [overhauled][io-rfc] to reduce
10377 unnecessary abstractions and provide better interoperation with
10378 the underlying platform. The old `io` module remains temporarily
10380 * The standard library now [participates in feature gating][feat],
10381 so use of unstable libraries now requires a `#![feature(...)]`
10382 attribute. The impact of this change is [described on the
10383 forum][feat-forum]. [RFC][feat-rfc].
10387 * `for` loops [now operate on the `IntoIterator` trait][into],
10388 which eliminates the need to call `.iter()`, etc. to iterate
10389 over collections. There are some new subtleties to remember
10390 though regarding what sort of iterators various types yield, in
10391 particular that `for foo in bar { }` yields values from a move
10392 iterator, destroying the original collection. [RFC][into-rfc].
10393 * Objects now have [default lifetime bounds][obj], so you don't
10394 have to write `Box<Trait+'static>` when you don't care about
10395 storing references. [RFC][obj-rfc].
10396 * In types that implement `Drop`, [lifetimes must outlive the
10397 value][drop]. This will soon make it possible to safely
10398 implement `Drop` for types where `#[unsafe_destructor]` is now
10399 required. Read the [gorgeous RFC][drop-rfc] for details.
10400 * The fully qualified <T as Trait>::X syntax lets you set the Self
10401 type for a trait method or associated type. [RFC][ufcs-rfc].
10402 * References to types that implement `Deref<U>` now [automatically
10403 coerce to references][deref] to the dereferenced type `U`,
10404 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10405 should eliminate many unsightly uses of `&*`, as when converting
10406 from references to vectors into references to
10407 slices. [RFC][deref-rfc].
10408 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10409 `|:|`) is obsolete and closure kind is inferred from context.
10410 * [`Self` is a keyword][Self].
10414 * The `Show` and `String` formatting traits [have been
10415 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10416 their related purposes. Automatically getting a string
10417 conversion to use with `format!("{:?}", something_to_debug)` is
10418 now written `#[derive(Debug)]`.
10419 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10420 OsStr}`, provide strings in platform-specific encodings for easier
10421 interop with system APIs. [RFC][osstr-rfc].
10422 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10423 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10424 creating raw pointers.
10428 * Certain long error messages of the form 'expected foo found bar'
10429 are now [split neatly across multiple
10430 lines][multiline]. Examples in the PR.
10431 * On Unix Rust can be [uninstalled][un] by running
10432 `/usr/local/lib/rustlib/uninstall.sh`.
10433 * The `#[rustc_on_unimplemented]` attribute, requiring the
10434 'on_unimplemented' feature, lets rustc [display custom error
10435 messages when a trait is expected to be implemented for a type
10440 * Rust is tested against a [LALR grammar][lalr], which parses
10441 almost all the Rust files that rustc does.
10443 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10444 [close]: https://github.com/rust-lang/rust/pull/21843
10445 [deref]: https://github.com/rust-lang/rust/pull/21351
10446 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10447 [drop]: https://github.com/rust-lang/rust/pull/21972
10448 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10449 [feat]: https://github.com/rust-lang/rust/pull/21248
10450 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10451 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10452 [fmt]: https://github.com/rust-lang/rust/pull/21457
10453 [into]: https://github.com/rust-lang/rust/pull/20790
10454 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10455 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10456 [lalr]: https://github.com/rust-lang/rust/pull/21452
10457 [multiline]: https://github.com/rust-lang/rust/pull/19870
10458 [obj]: https://github.com/rust-lang/rust/pull/22230
10459 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10460 [onun]: https://github.com/rust-lang/rust/pull/20889
10461 [osstr]: https://github.com/rust-lang/rust/pull/21488
10462 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10463 [Self]: https://github.com/rust-lang/rust/pull/22158
10464 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10465 [un]: https://github.com/rust-lang/rust/pull/22256
10468 Version 1.0.0-alpha (2015-01-09)
10469 ==================================
10471 * ~2400 changes, numerous bugfixes
10475 * The language itself is considered feature complete for 1.0,
10476 though there will be many usability improvements and bugfixes
10477 before the final release.
10478 * Nearly 50% of the public API surface of the standard library has
10479 been declared 'stable'. Those interfaces are unlikely to change
10481 * The long-running debate over integer types has been
10482 [settled][ints]: Rust will ship with types named `isize` and
10483 `usize`, rather than `int` and `uint`, for pointer-sized
10484 integers. Guidelines will be rolled out during the alpha cycle.
10485 * Most crates that are not `std` have been moved out of the Rust
10486 distribution into the Cargo ecosystem so they can evolve
10487 separately and don't need to be stabilized as quickly, including
10488 'time', 'getopts', 'num', 'regex', and 'term'.
10489 * Documentation continues to be expanded with more API coverage, more
10490 examples, and more in-depth explanations. The guides have been
10491 consolidated into [The Rust Programming Language][trpl].
10492 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10493 * All official Rust binary installers now come with [Cargo], the
10494 Rust package manager.
10498 * Closures have been [completely redesigned][unboxed] to be
10499 implemented in terms of traits, can now be used as generic type
10500 bounds and thus monomorphized and inlined, or via an opaque
10501 pointer (boxed) as in the old system. The new system is often
10502 referred to as 'unboxed' closures.
10503 * Traits now support [associated types][assoc], allowing families
10504 of related types to be defined together and used generically in
10506 * Enum variants are [namespaced by their type names][enum].
10507 * [`where` clauses][where] provide a more versatile and attractive
10508 syntax for specifying generic bounds, though the previous syntax
10510 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10512 * Rust [no longer has a runtime][rt] of any description, and only
10513 supports OS threads, not green threads.
10514 * At long last, Rust has been overhauled for 'dynamically-sized
10515 types' ([DST]), which integrates 'fat pointers' (object types,
10516 arrays, and `str`) more deeply into the type system, making it
10518 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10519 `..j` that produce range types and which, when combined with the
10520 `Index` operator and multidispatch, leads to a convenient slice
10521 notation, `[i..j]`.
10522 * The new range syntax revealed an ambiguity in the fixed-length
10523 array syntax, so now fixed length arrays [are written `[T;
10525 * The `Copy` trait is no longer implemented automatically. Unsafe
10526 pointers no longer implement `Sync` and `Send` so types
10527 containing them don't automatically either. `Sync` and `Send`
10528 are now 'unsafe traits' so one can "forcibly" implement them via
10529 `unsafe impl` if a type confirms to the requirements for them
10530 even though the internals do not (e.g. structs containing unsafe
10531 pointers like `Arc`). These changes are intended to prevent some
10532 footguns and are collectively known as [opt-in built-in
10533 traits][oibit] (though `Sync` and `Send` will soon become pure
10534 library types unknown to the compiler).
10535 * Operator traits now take their operands [by value][ops], and
10536 comparison traits can use multidispatch to compare one type
10537 against multiple other types, allowing e.g. `String` to be
10538 compared with `&str`.
10539 * `if let` and `while let` are no longer feature-gated.
10540 * Rust has adopted a more [uniform syntax for escaping unicode
10541 characters][unicode].
10542 * `macro_rules!` [has been declared stable][mac]. Though it is a
10543 flawed system it is sufficiently popular that it must be usable
10544 for 1.0. Effort has gone into [future-proofing][mac-future] it
10545 in ways that will allow other macro systems to be developed in
10546 parallel, and won't otherwise impact the evolution of the
10548 * The prelude has been [pared back significantly][prelude] such
10549 that it is the minimum necessary to support the most pervasive
10550 code patterns, and through [generalized where clauses][where]
10551 many of the prelude extension traits have been consolidated.
10552 * Rust's rudimentary reflection [has been removed][refl], as it
10553 incurred too much code generation for little benefit.
10554 * [Struct variants][structvars] are no longer feature-gated.
10555 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10556 known as 'higher-ranked trait bounds', this crucially allows
10557 unboxed closures to work.
10558 * Macros invocations surrounded by parens or square brackets and
10559 not terminated by a semicolon are [parsed as
10560 expressions][macros], which makes expressions like `vec![1i32,
10561 2, 3].len()` work as expected.
10562 * Trait objects now implement their traits automatically, and
10563 traits that can be coerced to objects now must be [object
10565 * Automatically deriving traits is now done with `#[derive(...)]`
10566 not `#[deriving(...)]` for [consistency with other naming
10567 conventions][derive].
10568 * Importing the containing module or enum at the same time as
10569 items or variants they contain is [now done with `self` instead
10570 of `mod`][self], as in use `foo::{self, bar}`
10571 * Glob imports are no longer feature-gated.
10572 * The `box` operator and `box` patterns have been feature-gated
10573 pending a redesign. For now unique boxes should be allocated
10574 like other containers, with `Box::new`.
10578 * A [series][coll1] of [efforts][coll2] to establish
10579 [conventions][coll3] for collections types has resulted in API
10580 improvements throughout the standard library.
10581 * New [APIs for error handling][err] provide ergonomic interop
10582 between error types, and [new conventions][err-conv] describe
10583 more clearly the recommended error handling strategies in Rust.
10584 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10585 it is easier to discuss failure in the context of error handling
10586 without making clarifications as to whether you are referring to
10587 the 'fail' macro or failure more generally.
10588 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10589 syscall when available.
10590 * The 'serialize' crate has been renamed 'rustc-serialize' and
10591 moved out of the distribution to Cargo. Although it is widely
10592 used now, it is expected to be superseded in the near future.
10593 * The `Show` formatter, typically implemented with
10594 `#[derive(Show)]` is [now requested with the `{:?}`
10595 specifier][show] and is intended for use by all types, for uses
10596 such as `println!` debugging. The new `String` formatter must be
10597 implemented by hand, uses the `{}` specifier, and is intended
10598 for full-fidelity conversions of things that can logically be
10599 represented as strings.
10603 * [Flexible target specification][flex] allows rustc's code
10604 generation to be configured to support otherwise-unsupported
10606 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10607 respective debuggers with Rust-appropriate pretty-printing.
10608 * The Windows installation of Rust is distributed with the
10609 MinGW components currently required to link binaries on that
10614 * Nullable enum optimizations have been extended to more types so
10615 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10616 space than the inner types themselves.
10617 * Work has begun on supporting AArch64.
10619 [Cargo]: https://crates.io
10620 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10621 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10622 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10623 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10624 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10625 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10626 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10627 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10628 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10629 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10630 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10631 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10632 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10633 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10634 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10635 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10636 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10637 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10638 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10639 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10640 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10641 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10642 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10643 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10644 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10645 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10646 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10647 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10648 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10649 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10650 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10651 [trpl]: https://doc.rust-lang.org/book/index.html
10652 [rbe]: http://rustbyexample.com/
10655 Version 0.12.0 (2014-10-09)
10656 =============================
10658 * ~1900 changes, numerous bugfixes
10662 * The introductory documentation (now called The Rust Guide) has
10663 been completely rewritten, as have a number of supplementary
10665 * Rust's package manager, Cargo, continues to improve and is
10666 sometimes considered to be quite awesome.
10667 * Many API's in `std` have been reviewed and updated for
10668 consistency with the in-development Rust coding
10669 guidelines. The standard library documentation tracks
10670 stabilization progress.
10671 * Minor libraries have been moved out-of-tree to the rust-lang org
10672 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10673 be installed with Cargo.
10674 * Lifetime elision allows lifetime annotations to be left off of
10675 function declarations in many common scenarios.
10676 * Rust now works on 64-bit Windows.
10679 * Indexing can be overloaded with the `Index` and `IndexMut`
10681 * The `if let` construct takes a branch only if the `let` pattern
10682 matches, currently behind the 'if_let' feature gate.
10683 * 'where clauses', a more flexible syntax for specifying trait
10684 bounds that is more aesthetic, have been added for traits and
10685 free functions. Where clauses will in the future make it
10686 possible to constrain associated types, which would be
10687 impossible with the existing syntax.
10688 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10689 the 'slicing_syntax' feature gate, and can be overloaded with
10690 the `Slice` or `SliceMut` traits.
10691 * The syntax for matching of sub-slices has been changed to use a
10692 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10693 consistency with other uses of `..` and to future-proof
10694 potential additional uses of the syntax.
10695 * The syntax for matching inclusive ranges in patterns has changed
10696 from `0..3` to `0...4` to be consistent with the exclusive range
10697 syntax for slicing.
10698 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10699 c]`) has been put behind the 'advanced_slice_patterns' feature
10700 gate and may be removed in the future.
10701 * Components of tuples and tuple structs can be extracted using
10702 the `value.0` syntax, currently behind the `tuple_indexing`
10704 * The `#[crate_id]` attribute is no longer supported; versioning
10705 is handled by the package manager.
10706 * Renaming crate imports are now written `extern crate foo as bar`
10707 instead of `extern crate bar = foo`.
10708 * Renaming use statements are now written `use foo as bar` instead
10709 of `use bar = foo`.
10710 * `let` and `match` bindings and argument names in macros are now
10712 * The new, more efficient, closure types ('unboxed closures') have
10713 been added under a feature gate, 'unboxed_closures'. These will
10714 soon replace the existing closure types, once higher-ranked
10715 trait lifetimes are added to the language.
10716 * `move` has been added as a keyword, for indicating closures
10717 that capture by value.
10718 * Mutation and assignment is no longer allowed in pattern guards.
10719 * Generic structs and enums can now have trait bounds.
10720 * The `Share` trait is now called `Sync` to free up the term
10721 'shared' to refer to 'shared reference' (the default reference
10723 * Dynamically-sized types have been mostly implemented,
10724 unifying the behavior of fat-pointer types with the rest of the
10726 * As part of dynamically-sized types, the `Sized` trait has been
10727 introduced, which qualifying types implement by default, and
10728 which type parameters expect by default. To specify that a type
10729 parameter does not need to be sized, write `<Sized? T>`. Most
10730 types are `Sized`, notable exceptions being unsized arrays
10731 (`[T]`) and trait types.
10732 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10733 * Lifetime bounds can now be applied to type parameters and object
10735 * The old, reference counted GC type, `Gc<T>` which was once
10736 denoted by the `@` sigil, has finally been removed. GC will be
10737 revisited in the future.
10740 * Library documentation has been improved for a number of modules.
10741 * Bit-vectors, collections::bitv has been modernized.
10742 * The url crate is deprecated in favor of
10743 http://github.com/servo/rust-url, which can be installed with
10745 * Most I/O stream types can be cloned and subsequently closed from
10746 a different thread.
10747 * A `std::time::Duration` type has been added for use in I/O
10748 methods that rely on timers, as well as in the 'time' crate's
10749 `Timespec` arithmetic.
10750 * The runtime I/O abstraction layer that enabled the green thread
10751 scheduler to do non-thread-blocking I/O has been removed, along
10752 with the libuv-based implementation employed by the green thread
10753 scheduler. This will greatly simplify the future I/O work.
10754 * `collections::btree` has been rewritten to have a more
10755 idiomatic and efficient design.
10758 * rustdoc output now indicates the stability levels of API's.
10759 * The `--crate-name` flag can specify the name of the crate
10760 being compiled, like `#[crate_name]`.
10761 * The `-C metadata` specifies additional metadata to hash into
10762 symbol names, and `-C extra-filename` specifies additional
10763 information to put into the output filename, for use by the
10764 package manager for versioning.
10765 * debug info generation has continued to improve and should be
10766 more reliable under both gdb and lldb.
10767 * rustc has experimental support for compiling in parallel
10768 using the `-C codegen-units` flag.
10769 * rustc no longer encodes rpath information into binaries by
10773 * Stack usage has been optimized with LLVM lifetime annotations.
10774 * Official Rust binaries on Linux are more compatible with older
10775 kernels and distributions, built on CentOS 5.10.
10778 Version 0.11.0 (2014-07-02)
10779 ==========================
10781 * ~1700 changes, numerous bugfixes
10784 * ~[T] has been removed from the language. This type is superseded by
10786 * ~str has been removed from the language. This type is superseded by
10788 * ~T has been removed from the language. This type is superseded by the
10790 * @T has been removed from the language. This type is superseded by the
10791 standard library's std::gc::Gc<T> type.
10792 * Struct fields are now all private by default.
10793 * Vector indices and shift amounts are both required to be a `uint`
10794 instead of any integral type.
10795 * Byte character, byte string, and raw byte string literals are now all
10796 supported by prefixing the normal literal with a `b`.
10797 * Multiple ABIs are no longer allowed in an ABI string
10798 * The syntax for lifetimes on closures/procedures has been tweaked
10799 slightly: `<'a>|A, B|: 'b + K -> T`
10800 * Floating point modulus has been removed from the language; however it
10801 is still provided by a library implementation.
10802 * Private enum variants are now disallowed.
10803 * The `priv` keyword has been removed from the language.
10804 * A closure can no longer be invoked through a &-pointer.
10805 * The `use foo, bar, baz;` syntax has been removed from the language.
10806 * The transmute intrinsic no longer works on type parameters.
10807 * Statics now allow blocks/items in their definition.
10808 * Trait bounds are separated from objects with + instead of : now.
10809 * Objects can no longer be read while they are mutably borrowed.
10810 * The address of a static is now marked as insignificant unless the
10811 #[inline(never)] attribute is placed it.
10812 * The #[unsafe_destructor] attribute is now behind a feature gate.
10813 * Struct literals are no longer allowed in ambiguous positions such as
10814 if, while, match, and for..in.
10815 * Declaration of lang items and intrinsics are now feature-gated by
10817 * Integral literals no longer default to `int`, and floating point
10818 literals no longer default to `f64`. Literals must be suffixed with an
10819 appropriate type if inference cannot determine the type of the
10821 * The Box<T> type is no longer implicitly borrowed to &mut T.
10822 * Procedures are now required to not capture borrowed references.
10825 * The standard library is now a "facade" over a number of underlying
10826 libraries. This means that development on the standard library should
10827 be speedier due to smaller crates, as well as a clearer line between
10829 * A new library, libcore, lives under the standard library's facade
10830 which is Rust's "0-assumption" library, suitable for embedded and
10831 kernel development for example.
10832 * A regex crate has been added to the standard distribution. This crate
10833 includes statically compiled regular expressions.
10834 * The unwrap/unwrap_err methods on Result require a Show bound for
10835 better error messages.
10836 * The return types of the std::comm primitives have been centralized
10837 around the Result type.
10838 * A number of I/O primitives have gained the ability to time out their
10840 * A number of I/O primitives have gained the ability to close their
10841 reading/writing halves to cancel pending operations.
10842 * Reverse iterator methods have been removed in favor of `rev()` on
10843 their forward-iteration counterparts.
10844 * A bitflags! macro has been added to enable easy interop with C and
10845 management of bit flags.
10846 * A debug_assert! macro is now provided which is disabled when
10847 `--cfg ndebug` is passed to the compiler.
10848 * A graphviz crate has been added for creating .dot files.
10849 * The std::cast module has been migrated into std::mem.
10850 * The std::local_data api has been migrated from freestanding functions
10851 to being based on methods.
10852 * The Pod trait has been renamed to Copy.
10853 * jemalloc has been added as the default allocator for types.
10854 * The API for allocating memory has been changed to use proper alignment
10855 and sized deallocation
10856 * Connecting a TcpStream or binding a TcpListener is now based on a
10857 string address and a u16 port. This allows connecting to a hostname as
10859 * The Reader trait now contains a core method, read_at_least(), which
10860 correctly handles many repeated 0-length reads.
10861 * The process-spawning API is now centered around a builder-style
10863 * The :? printing qualifier has been moved from the standard library to
10864 an external libdebug crate.
10865 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10866 have been renamed to Eq/Ord.
10867 * The select/plural methods have been removed from format!. The escapes
10868 for { and } have also changed from \{ and \} to {{ and }},
10870 * The TaskBuilder API has been re-worked to be a true builder, and
10871 extension traits for spawning native/green tasks have been added.
10874 * All breaking changes to the language or libraries now have their
10875 commit message annotated with `[breaking-change]` to allow for easy
10876 discovery of breaking changes.
10877 * The compiler will now try to suggest how to annotate lifetimes if a
10878 lifetime-related error occurs.
10879 * Debug info continues to be improved greatly with general bug fixes and
10880 better support for situations like link time optimization (LTO).
10881 * Usage of syntax extensions when cross-compiling has been fixed.
10882 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10883 -fdata-sections and --gc-sections has been enabled by default
10884 * The compiler is now stricter about where it will load module files
10885 from when a module is declared via `mod foo;`.
10886 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10887 Syntax extensions are now discovered via a "plugin registrar" type
10888 which will be extended in the future to other various plugins.
10889 * Lints have been restructured to allow for dynamically loadable lints.
10890 * A number of rustdoc improvements:
10891 * The HTML output has been visually redesigned.
10892 * Markdown is now powered by hoedown instead of sundown.
10893 * Searching heuristics have been greatly improved.
10894 * The search index has been reduced in size by a great amount.
10895 * Cross-crate documentation via `pub use` has been greatly improved.
10896 * Primitive types are now hyperlinked and documented.
10897 * Documentation has been moved from static.rust-lang.org/doc to
10899 * A new sandbox, play.rust-lang.org, is available for running and
10900 sharing rust code examples on-line.
10901 * Unused attributes are now more robustly warned about.
10902 * The dead_code lint now warns about unused struct fields.
10903 * Cross-compiling to iOS is now supported.
10904 * Cross-compiling to mipsel is now supported.
10905 * Stability attributes are now inherited by default and no longer apply
10906 to intra-crate usage, only inter-crate usage.
10907 * Error message related to non-exhaustive match expressions have been
10911 Version 0.10 (2014-04-03)
10912 =========================
10914 * ~1500 changes, numerous bugfixes
10917 * A new RFC process is now in place for modifying the language.
10918 * Patterns with `@`-pointers have been removed from the language.
10919 * Patterns with unique vectors (`~[T]`) have been removed from the
10921 * Patterns with unique strings (`~str`) have been removed from the
10923 * `@str` has been removed from the language.
10924 * `@[T]` has been removed from the language.
10925 * `@self` has been removed from the language.
10926 * `@Trait` has been removed from the language.
10927 * Headers on `~` allocations which contain `@` boxes inside the type for
10928 reference counting have been removed.
10929 * The semantics around the lifetimes of temporary expressions have changed,
10930 see #3511 and #11585 for more information.
10931 * Cross-crate syntax extensions are now possible, but feature gated. See
10932 #11151 for more information. This includes both `macro_rules!` macros as
10933 well as syntax extensions such as `format!`.
10934 * New lint modes have been added, and older ones have been turned on to be
10936 * Unnecessary parentheses
10937 * Uppercase statics
10939 * Uppercase variables
10940 * Publicly visible private types
10941 * `#[deriving]` with raw pointers
10942 * Unsafe functions can no longer be coerced to closures.
10943 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10944 * The `#[simd]` attribute is now behind a feature gate.
10945 * Visibility is no longer allowed on `extern crate` statements, and
10946 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10947 * Trailing commas are now allowed in argument lists and tuple patterns.
10948 * The `do` keyword has been removed, it is now a reserved keyword.
10949 * Default type parameters have been implemented, but are feature gated.
10950 * Borrowed variables through captures in closures are now considered soundly.
10951 * `extern mod` is now `extern crate`
10952 * The `Freeze` trait has been removed.
10953 * The `Share` trait has been added for types that can be shared among
10955 * Labels in macros are now hygienic.
10956 * Expression/statement macro invocations can be delimited with `{}` now.
10957 * Treatment of types allowed in `static mut` locations has been tweaked.
10958 * The `*` and `.` operators are now overloadable through the `Deref` and
10960 * `~Trait` and `proc` no longer have `Send` bounds by default.
10961 * Partial type hints are now supported with the `_` type marker.
10962 * An `Unsafe` type was introduced for interior mutability. It is now
10963 considered undefined to transmute from `&T` to `&mut T` without using the
10965 * The #[linkage] attribute was implemented for extern statics/functions.
10966 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10967 * `Pod` was renamed to `Copy`.
10970 * The `libextra` library has been removed. It has now been decomposed into
10971 component libraries with smaller and more focused nuggets of
10972 functionality. The full list of libraries can be found on the
10973 documentation index page.
10974 * std: `std::condition` has been removed. All I/O errors are now propagated
10975 through the `Result` type. In order to assist with error handling, a
10976 `try!` macro for unwrapping errors with an early return and a lint for
10977 unused results has been added. See #12039 for more information.
10978 * std: The `vec` module has been renamed to `slice`.
10979 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10980 This will become the only growable vector in the future.
10981 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10982 are now found at `std::io::BufferedReader` instead of
10983 `std::io::buffered::BufferedReader`.
10984 * std: `print` and `println` are no longer in the prelude, the `print!` and
10985 `println!` macros are intended to be used instead.
10986 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10987 attempts to statically prevent cycles.
10988 * std: The standard distribution is adopting the policy of pushing failure
10989 to the user rather than failing in libraries. Many functions (such as
10990 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10991 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10992 deriving mode: `#[deriving(Show)]`.
10993 * std: `ToStr` is now implemented for all types implementing `Show`.
10994 * std: The formatting trait methods now take `&self` instead of `&T`
10995 * std: The `invert()` method on iterators has been renamed to `rev()`
10996 * std: `std::num` has seen a reduction in the genericity of its traits,
10997 consolidating functionality into a few core traits.
10998 * std: Backtraces are now printed on task failure if the environment
10999 variable `RUST_BACKTRACE` is present.
11000 * std: Naming conventions for iterators have been standardized. More details
11001 can be found on the wiki's style guide.
11002 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11003 still implement the function.
11004 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11005 * std: `assert_approx_eq!` has been removed
11006 * std: The `e` and `E` formatting specifiers for floats have been added to
11007 print them in exponential notation.
11008 * std: The `Times` trait has been removed
11009 * std: Indications of variance and opting out of builtin bounds is done
11010 through marker types in `std::kinds::marker` now
11011 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11012 `#[deriving(Hash)]` is now possible.
11013 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11014 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11015 * std: `Chan::new` is now `channel()`.
11016 * std: A new synchronous channel type has been implemented.
11017 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11018 * std: `hashmap` and `trie` have been moved to `libcollections`
11019 * std: `run` has been rolled into `io::process`
11020 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11021 * std: The equality and comparison traits have seen some reorganization.
11022 * std: `rand` has moved to `librand`.
11023 * std: `to_{lower,upper}case` has been implemented for `char`.
11024 * std: Logging has been moved to `liblog`.
11025 * collections: `HashMap` has been rewritten for higher performance and less
11027 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11028 it can be booted manually. The runtime guide has more information and
11030 * native: All I/O functionality except signals has been implemented.
11031 * green: Task spawning with `libgreen` has been optimized with stack caching
11032 and various trimming of code.
11033 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11034 * sync: The `extra::sync` module has been updated to modern rust (and moved
11035 to the `sync` library), tweaking and improving various interfaces while
11036 dropping redundant functionality.
11037 * sync: A new `Barrier` type has been added to the `sync` library.
11038 * sync: An efficient mutex for native and green tasks has been implemented.
11039 * serialize: The `base64` module has seen some improvement. It treats
11040 newlines better, has non-string error values, and has seen general
11042 * fourcc: A `fourcc!` macro was introduced
11043 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11044 hexadecimal literal.
11047 * `rustpkg` has been deprecated and removed from the main repository. Its
11048 replacement, `cargo`, is under development.
11049 * Nightly builds of rust are now available
11050 * The memory usage of rustc has been improved many times throughout this
11052 * The build process supports disabling rpath support for the rustc binary
11054 * Code generation has improved in some cases, giving more information to the
11055 LLVM optimization passes to enable more extensive optimizations.
11056 * Debuginfo compatibility with lldb on OSX has been restored.
11057 * The master branch is now gated on an android bot, making building for
11058 android much more reliable.
11059 * Output flags have been centralized into one `--emit` flag.
11060 * Crate type flags have been centralized into one `--crate-type` flag.
11061 * Codegen flags have been consolidated behind a `-C` flag.
11062 * Linking against outdated crates now has improved error messages.
11063 * Error messages with lifetimes will often suggest how to annotate the
11064 function to fix the error.
11065 * Many more types are documented in the standard library, and new guides
11067 * Many `rustdoc` improvements:
11068 * code blocks are syntax highlighted.
11069 * render standalone markdown files.
11070 * the --test flag tests all code blocks by default.
11071 * exported macros are displayed.
11072 * re-exported types have their documentation inlined at the location of the
11074 * search works across crates that have been rendered to the same output
11078 Version 0.9 (2014-01-09)
11079 ==========================
11081 * ~1800 changes, numerous bugfixes
11084 * The `float` type has been removed. Use `f32` or `f64` instead.
11085 * A new facility for enabling experimental features (feature gating) has
11086 been added, using the crate-level `#[feature(foo)]` attribute.
11087 * Managed boxes (@) are now behind a feature gate
11088 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11089 standard library's `Gc` or `Rc` types instead.
11090 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11091 * Jumping back to the top of a loop is now done with `continue` instead of
11093 * Strings can no longer be mutated through index assignment.
11094 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11095 hash delimiters, as in `r###"foo"###`.
11096 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11098 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11099 * `@fn`s have been removed.
11100 * `do` only works with procs in order to make it obvious what the cost
11102 * Single-element tuple-like structs can no longer be dereferenced to
11103 obtain the inner value. A more comprehensive solution for overloading
11104 the dereference operator will be provided in the future.
11105 * The `#[link(...)]` attribute has been replaced with
11106 `#[crate_id = "name#vers"]`.
11107 * Empty `impl`s must be terminated with empty braces and may not be
11108 terminated with a semicolon.
11109 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11110 no longer has any special meaning.
11111 * The old `fmt!` string formatting macro has been removed.
11112 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11113 `print!` and `println!`.
11114 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11115 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11116 `extern mod foo = "bar"` instead.
11117 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11118 * Macros can have attributes.
11119 * Macros can expand to items with attributes.
11120 * Macros can expand to multiple items.
11121 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11122 * Comments may be nested.
11123 * Values automatically coerce to trait objects they implement, without
11125 * Enum discriminants are no longer an entire word but as small as needed to
11126 contain all the variants. The `repr` attribute can be used to override
11127 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11128 `#[repr(C)]` to match C enums.
11129 * Non-string literals are not allowed in attributes (they never worked).
11130 * The FFI now supports variadic functions.
11131 * Octal numeric literals, as in `0o7777`.
11132 * The `concat!` syntax extension performs compile-time string concatenation.
11133 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11134 removed as Rust no longer uses segmented stacks.
11135 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11136 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11137 not `*`; ignoring remaining fields of a struct is also done with `..`,
11138 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11139 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11140 * `rustc` supports the "system" calling convention, which defaults to the
11141 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11143 * The `type_overflow` lint (default: warn) checks literals for overflow.
11144 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11145 * The `attribute_usage` lint (default: warn) warns about unknown
11147 * The `unknown_features` lint (default: warn) warns about unknown
11149 * The `dead_code` lint (default: warn) checks for dead code.
11150 * Rust libraries can be linked statically to one another
11151 * `#[link_args]` is behind the `link_args` feature gate.
11152 * Native libraries are now linked with `#[link(name = "foo")]`
11153 * Native libraries can be statically linked to a rust crate
11154 (`#[link(name = "foo", kind = "static")]`).
11155 * Native OS X frameworks are now officially supported
11156 (`#[link(name = "foo", kind = "framework")]`).
11157 * The `#[thread_local]` attribute creates thread-local (not task-local)
11158 variables. Currently behind the `thread_local` feature gate.
11159 * The `return` keyword may be used in closures.
11160 * Types that can be copied via a memcpy implement the `Pod` kind.
11161 * The `cfg` attribute can now be used on struct fields and enum variants.
11164 * std: The `option` and `result` API's have been overhauled to make them
11165 simpler, more consistent, and more composable.
11166 * std: The entire `std::io` module has been replaced with one that is
11167 more comprehensive and that properly interfaces with the underlying
11168 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11170 * std: `io::util` contains a number of useful implementations of
11171 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11172 `ZeroReader`, `TeeReader`.
11173 * std: The reference counted pointer type `extra::rc` moved into std.
11174 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11175 just a wrapper around it).
11176 * std: The `Either` type has been removed.
11177 * std: `fmt::Default` can be implemented for any type to provide default
11178 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11179 * std: The `rand` API continues to be tweaked.
11180 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11181 on failure in gdb, is now named `rust_fail`.
11182 * std: The `each_key` and `each_value` methods on `HashMap` have been
11183 replaced by the `keys` and `values` iterators.
11184 * std: Functions dealing with type size and alignment have moved from the
11185 `sys` module to the `mem` module.
11186 * std: The `path` module was written and API changed.
11187 * std: `str::from_utf8` has been changed to cast instead of allocate.
11188 * std: `starts_with` and `ends_with` methods added to vectors via the
11189 `ImmutableEqVector` trait, which is in the prelude.
11190 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11191 if the index is out of bounds.
11192 * std: Task failure no longer propagates between tasks, as the model was
11193 complex, expensive, and incompatible with thread-based tasks.
11194 * std: The `Any` type can be used for dynamic typing.
11195 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11197 * std: Methods that produce iterators generally do not have an `_iter`
11199 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11200 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11201 * std: `util::ignore` renamed to `prelude::drop`.
11202 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11204 * std: `vec::raw` has seen a lot of cleanup and API changes.
11205 * std: The standard library no longer includes any C++ code, and very
11206 minimal C, eliminating the dependency on libstdc++.
11207 * std: Runtime scheduling and I/O functionality has been factored out into
11208 extensible interfaces and is now implemented by two different crates:
11209 libnative, for native threading and I/O; and libgreen, for green threading
11210 and I/O. This paves the way for using the standard library in more limited
11211 embedded environments.
11212 * std: The `comm` module has been rewritten to be much faster, have a
11213 simpler, more consistent API, and to work for both native and green
11215 * std: All libuv dependencies have been moved into the rustuv crate.
11216 * native: New implementations of runtime scheduling on top of OS threads.
11217 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11219 * green: The green thread scheduler and message passing types are almost
11220 entirely lock-free.
11221 * extra: The `flatpipes` module had bitrotted and was removed.
11222 * extra: All crypto functions have been removed and Rust now has a policy of
11223 not reimplementing crypto in the standard library. In the future crypto
11224 will be provided by external crates with bindings to established libraries.
11225 * extra: `c_vec` has been modernized.
11226 * extra: The `sort` module has been removed. Use the `sort` method on
11230 * The `rust` and `rusti` commands have been removed, due to lack of
11232 * `rustdoc` was completely rewritten.
11233 * `rustdoc` can test code examples in documentation.
11234 * `rustpkg` can test packages with the argument, 'test'.
11235 * `rustpkg` supports arbitrary dependencies, including C libraries.
11236 * `rustc`'s support for generating debug info is improved again.
11237 * `rustc` has better error reporting for unbalanced delimiters.
11238 * `rustc`'s JIT support was removed due to bitrot.
11239 * Executables and static libraries can be built with LTO (-Z lto)
11240 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11244 Version 0.8 (2013-09-26)
11245 ============================
11247 * ~2200 changes, numerous bugfixes
11250 * The `for` loop syntax has changed to work with the `Iterator` trait.
11251 * At long last, unwinding works on Windows.
11252 * Default methods are ready for use.
11253 * Many trait inheritance bugs fixed.
11254 * Owned and borrowed trait objects work more reliably.
11255 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11256 * rustc can omit emission of code for the `debug!` macro if it is passed
11258 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11259 for foo.rs, then foo/mod.rs, and will generate an error when both are
11261 * Strings no longer contain trailing nulls. The new `std::c_str` module
11262 provides new mechanisms for converting to C strings.
11263 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11264 * The FFI has been overhauled such that foreign functions are called directly,
11265 instead of through a stack-switching wrapper.
11266 * Calling a foreign function must be done through a Rust function with the
11267 `#[fixed_stack_segment]` attribute.
11268 * The `externfn!` macro can be used to declare both a foreign function and
11269 a `#[fixed_stack_segment]` wrapper at once.
11270 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11271 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11272 * `priv` is disallowed everywhere except for struct fields and enum variants.
11273 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11274 * `ref` bindings in irrefutable patterns work correctly now.
11275 * `char` is now prevented from containing invalid code points.
11276 * Casting to `bool` is no longer allowed.
11277 * `\0` is now accepted as an escape in chars and strings.
11278 * `yield` is a reserved keyword.
11279 * `typeof` is a reserved keyword.
11280 * Crates may be imported by URL with `extern mod foo = "url";`.
11281 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11282 * Static vectors can be initialized with repeating elements,
11283 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11284 * Static structs can be initialized with functional record update,
11285 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11286 * `cfg!` can be used to conditionally execute code based on the crate
11287 configuration, similarly to `#[cfg(...)]`.
11288 * The `unnecessary_qualification` lint detects unneeded module
11289 prefixes (default: allow).
11290 * Arithmetic operations have been implemented on the SIMD types in
11291 `std::unstable::simd`.
11292 * Exchange allocation headers were removed, reducing memory usage.
11293 * `format!` implements a completely new, extensible, and higher-performance
11294 string formatting system. It will replace `fmt!`.
11295 * `print!` and `println!` write formatted strings (using the `format!`
11296 extension) to stdout.
11297 * `write!` and `writeln!` write formatted strings (using the `format!`
11298 extension) to the new Writers in `std::rt::io`.
11299 * The library section in which a function or static is placed may
11300 be specified with `#[link_section = "..."]`.
11301 * The `proto!` syntax extension for defining bounded message protocols
11303 * `macro_rules!` is hygienic for `let` declarations.
11304 * The `#[export_name]` attribute specifies the name of a symbol.
11305 * `unreachable!` can be used to indicate unreachable code, and fails
11309 * std: Transitioned to the new runtime, written in Rust.
11310 * std: Added an experimental I/O library, `rt::io`, based on the new
11312 * std: A new generic `range` function was added to the prelude, replacing
11313 `uint::range` and friends.
11314 * std: `range_rev` no longer exists. Since range is an iterator it can be
11315 reversed with `range(lo, hi).invert()`.
11316 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11317 renamed to `unwrap_or`.
11318 * std: The `iterator` module was renamed to `iter`.
11319 * std: Integral types now support the `checked_add`, `checked_sub`, and
11320 `checked_mul` operations for detecting overflow.
11321 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11323 * std: Methods are standardizing on conventions for casting methods:
11324 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11326 * std: The `CString` type in `c_str` provides new ways to convert to and
11328 * std: `DoubleEndedIterator` can yield elements in two directions.
11329 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11331 * std: `str::from_bytes` renamed to `str::from_utf8`.
11332 * std: `pop_opt` and `shift_opt` methods added to vectors.
11333 * std: The task-local data interface no longer uses @, and keys are
11334 no longer function pointers.
11335 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11336 * std: Added `SharedPort` to `comm`.
11337 * std: `Eq` has a default method for `ne`; only `eq` is required
11338 in implementations.
11339 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11340 is required in implementations.
11341 * std: `is_utf8` performance is improved, impacting many string functions.
11342 * std: `os::MemoryMap` provides cross-platform mmap.
11343 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11344 are not 'in-bounds' are considered undefined.
11345 * std: Many freestanding functions in `vec` removed in favor of methods.
11346 * std: Many freestanding functions on scalar types removed in favor of
11348 * std: Many options to task builders were removed since they don't make
11349 sense in the new scheduler design.
11350 * std: More containers implement `FromIterator` so can be created by the
11352 * std: More complete atomic types in `unstable::atomics`.
11353 * std: `comm::PortSet` removed.
11354 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11355 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11356 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11357 default implementations.
11358 * std: Various `from_str` functions were removed in favor of a generic
11359 `from_str` which is available in the prelude.
11360 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11361 * extra: `dlist`, the doubly-linked list was modernized.
11362 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11363 * extra: Added `glob` module, replacing `std::os::glob`.
11364 * extra: `rope` was removed.
11365 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11366 * extra: `net`, and `timer` were removed. The experimental replacements
11367 are `std::rt::io::net` and `std::rt::io::timer`.
11368 * extra: Iterators implemented for `SmallIntMap`.
11369 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11370 * extra: `SmallIntSet` removed. Use `BitvSet`.
11371 * extra: Performance of JSON parsing greatly improved.
11372 * extra: `semver` updated to SemVer 2.0.0.
11373 * extra: `term` handles more terminals correctly.
11374 * extra: `dbg` module removed.
11375 * extra: `par` module removed.
11376 * extra: `future` was cleaned up, with some method renames.
11377 * extra: Most free functions in `getopts` were converted to methods.
11380 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11381 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11382 similarly to gcc's `--march` flag.
11383 * rustc's performance compiling small crates is much better.
11384 * rustpkg has received many improvements.
11385 * rustpkg supports git tags as package IDs.
11386 * rustpkg builds into target-specific directories so it can be used for
11388 * The number of concurrent test tasks is controlled by the environment
11389 variable RUST_TEST_TASKS.
11390 * The test harness can now report metrics for benchmarks.
11391 * All tools have man pages.
11392 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11393 * The runtime uses jemalloc for allocations.
11394 * Segmented stacks are temporarily disabled as part of the transition to
11395 the new runtime. Stack overflows are possible!
11396 * A new documentation backend, rustdoc_ng, is available for use. It is
11397 still invoked through the normal `rustdoc` command.
11400 Version 0.7 (2013-07-03)
11401 =======================
11403 * ~2000 changes, numerous bugfixes
11406 * `impl`s no longer accept a visibility qualifier. Put them on methods
11408 * The borrow checker has been rewritten with flow-sensitivity, fixing
11409 many bugs and inconveniences.
11410 * The `self` parameter no longer implicitly means `&'self self`,
11411 and can be explicitly marked with a lifetime.
11412 * Overloadable compound operators (`+=`, etc.) have been temporarily
11413 removed due to bugs.
11414 * The `for` loop protocol now requires `for`-iterators to return `bool`
11415 so they compose better.
11416 * The `Durable` trait is replaced with the `'static` bounds.
11417 * Trait default methods work more often.
11418 * Structs with the `#[packed]` attribute have byte alignment and
11419 no padding between fields.
11420 * Type parameters bound by `Copy` must now be copied explicitly with
11421 the `copy` keyword.
11422 * It is now illegal to move out of a dereferenced unsafe pointer.
11423 * `Option<~T>` is now represented as a nullable pointer.
11424 * `@mut` does dynamic borrow checks correctly.
11425 * The `main` function is only detected at the topmost level of the crate.
11426 The `#[main]` attribute is still valid anywhere.
11427 * Struct fields may no longer be mutable. Use inherited mutability.
11428 * The `#[no_send]` attribute makes a type that would otherwise be
11430 * The `#[no_freeze]` attribute makes a type that would otherwise be
11432 * Unbounded recursion will abort the process after reaching the limit
11433 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11434 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11435 are never implicitly copyable.
11436 * `#[static_assert]` makes compile-time assertions about static bools.
11437 * At long last, 'argument modes' no longer exist.
11438 * The rarely used `use mod` statement no longer exists.
11440 * Syntax extensions
11441 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11443 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11444 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11445 `#[deriving(...)]`.
11446 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11447 and unsuffixed integer literals.
11450 * The `core` crate was renamed to `std`.
11451 * The `std` crate was renamed to `extra`.
11452 * More and improved documentation.
11453 * std: `iterator` module for external iterator objects.
11454 * Many old-style (internal, higher-order function) iterators replaced by
11455 implementations of `Iterator`.
11456 * std: Many old internal vector and string iterators,
11457 incl. `any`, `all`. removed.
11458 * std: The `finalize` method of `Drop` renamed to `drop`.
11459 * std: The `drop` method now takes `&mut self` instead of `&self`.
11460 * std: The prelude no longer re-exports any modules, only types and traits.
11461 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11462 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11463 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11464 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11465 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11466 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11467 * std: Many types implement `Clone`.
11468 * std: `path` type renamed to `Path`.
11469 * std: `mut` module and `Mut` type removed.
11470 * std: Many standalone functions removed in favor of methods and iterators
11471 in `vec`, `str`. In the future methods will also work as functions.
11472 * std: `reinterpret_cast` removed. Use `transmute`.
11473 * std: ascii string handling in `std::ascii`.
11474 * std: `Rand` is implemented for ~/@.
11475 * std: `run` module for spawning processes overhauled.
11476 * std: Various atomic types added to `unstable::atomic`.
11477 * std: Various types implement `Zero`.
11478 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11479 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11480 * std: Added `os::mkdir_recursive`.
11481 * std: Added `os::glob` function performs filesystems globs.
11482 * std: `FuzzyEq` renamed to `ApproxEq`.
11483 * std: `Map` now defines `pop` and `swap` methods.
11484 * std: `Cell` constructors converted to static methods.
11485 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11486 * extra: `flate` module moved from `std` to `extra`.
11487 * extra: `fileinput` module for iterating over a series of files.
11488 * extra: `Complex` number type and `complex` module.
11489 * extra: `Rational` number type and `rational` module.
11490 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11491 * extra: `term` uses terminfo now, is more correct.
11492 * extra: `arc` functions converted to methods.
11493 * extra: Implementation of fixed output size variations of SHA-2.
11496 * `unused_variables` lint mode for unused variables (default: warn).
11497 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11499 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11501 * `dead_assignment` lint mode for unread variables (default: warn).
11502 * `unnecessary_allocation` lint mode detects some heap allocations that are
11503 immediately borrowed so could be written without allocating (default: warn).
11504 * `missing_doc` lint mode (default: allow).
11505 * `unreachable_code` lint mode (default: warn).
11506 * The `rusti` command has been rewritten and a number of bugs addressed.
11507 * rustc outputs in color on more terminals.
11508 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11509 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11510 * Compiling with `-g` will make the binary record information about
11511 dynamic borrowcheck failures for debugging.
11512 * rustdoc has a nicer stylesheet.
11513 * Various improvements to rustdoc.
11514 * Improvements to rustpkg (see the detailed release notes).
11517 Version 0.6 (2013-04-03)
11518 ========================
11520 * ~2100 changes, numerous bugfixes
11523 * The self type parameter in traits is now spelled `Self`
11524 * The `self` parameter in trait and impl methods must now be explicitly
11525 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11526 * Static methods no longer require the `static` keyword and instead
11527 are distinguished by the lack of a `self` parameter
11528 * Replaced the `Durable` trait with the `'static` lifetime
11529 * The old closure type syntax with the trailing sigil has been
11530 removed in favor of the more consistent leading sigil
11531 * `super` is a keyword, and may be prefixed to paths
11532 * Trait bounds are separated with `+` instead of whitespace
11533 * Traits are implemented with `impl Trait for Type`
11534 instead of `impl Type: Trait`
11535 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11536 * The `export` keyword has finally been removed
11537 * The `move` keyword has been removed (see "Semantic changes")
11538 * The interior mutability qualifier on vectors, `[mut T]`, has been
11539 removed. Use `&mut [T]`, etc.
11540 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11541 * `fail` is no longer a keyword. Use `fail!()`
11542 * `assert` is no longer a keyword. Use `assert!()`
11543 * `log` is no longer a keyword. use `debug!`, etc.
11544 * 1-tuples may be represented as `(T,)`
11545 * Struct fields may no longer be `mut`. Use inherited mutability,
11546 `@mut T`, `core::mut` or `core::cell`
11547 * `extern mod { ... }` is no longer valid syntax for foreign
11548 function modules. Use extern blocks: `extern { ... }`
11549 * Newtype enums removed. Use tuple-structs.
11550 * Trait implementations no longer support visibility modifiers
11551 * Pattern matching over vectors improved and expanded
11552 * `const` renamed to `static` to correspond to lifetime name,
11553 and make room for future `static mut` unsafe mutable globals.
11554 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11555 * `Clone` implementations can be automatically generated with
11556 `#[deriving(Clone)]`
11557 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11558 instead of `foo as Bar`.
11559 * Fixed length vector types are now written as `[int, .. 3]`
11560 instead of `[int * 3]`.
11561 * Fixed length vector types can express the length as a constant
11562 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11565 * Types with owned pointers or custom destructors move by default,
11566 eliminating the `move` keyword
11567 * All foreign functions are considered unsafe
11568 * &mut is now unaliasable
11569 * Writes to borrowed @mut pointers are prevented dynamically
11571 * The name of the main function can be customized using #[main]
11572 * The default type of an inferred closure is &fn instead of @fn
11573 * `use` statements may no longer be "chained" - they cannot import
11574 identifiers imported by previous `use` statements
11575 * `use` statements are crate relative, importing from the "top"
11576 of the crate by default. Paths may be prefixed with `super::`
11577 or `self::` to change the search behavior.
11578 * Method visibility is inherited from the implementation declaration
11579 * Structural records have been removed
11580 * Many more types can be used in static items, including enums
11581 'static-lifetime pointers and vectors
11582 * Pattern matching over vectors improved and expanded
11583 * Typechecking of closure types has been overhauled to
11584 improve inference and eliminate unsoundness
11585 * Macros leave scope at the end of modules, unless that module is
11586 tagged with #[macro_escape]
11589 * Added big integers to `std::bigint`
11590 * Removed `core::oldcomm` module
11591 * Added pipe-based `core::comm` module
11592 * Numeric traits have been reorganized under `core::num`
11593 * `vec::slice` finally returns a slice
11594 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11595 * Containers reorganized around traits in `core::container`
11596 * `core::dvec` removed, `~[T]` is a drop-in replacement
11597 * `core::send_map` renamed to `core::hashmap`
11598 * `std::map` removed; replaced with `core::hashmap`
11599 * `std::treemap` reimplemented as an owned balanced tree
11600 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11601 * `core::trie` added as a fast ordered map for integer keys
11602 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11603 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11604 overload the comparison operators, whereas `TotalOrd` is used
11605 by certain container types
11608 * Replaced the 'cargo' package manager with 'rustpkg'
11609 * Added all-purpose 'rust' tool
11610 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11611 * rustc now *attempts* to offer spelling suggestions
11612 * Improved support for ARM and Android
11613 * Preliminary MIPS backend
11614 * Improved foreign function ABI implementation for x86, x86_64
11615 * Various memory usage improvements
11616 * Rust code may be embedded in foreign code under limited circumstances
11617 * Inline assembler supported by new asm!() syntax extension.
11620 Version 0.5 (2012-12-21)
11621 ===========================
11623 * ~900 changes, numerous bugfixes
11626 * Removed `<-` move operator
11627 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11628 * Removed old fixed length vector syntax - `[T]/N`
11629 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11630 * Macros may now expand to items and statements
11631 * `a.b()` is always parsed as a method call, never as a field projection
11632 * `Eq` and `IterBytes` implementations can be automatically generated
11633 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11634 * Removed the special crate language for `.rc` files
11635 * Function arguments may consist of any irrefutable pattern
11638 * `&` and `~` pointers may point to objects
11639 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11640 * Enum variants may be structs
11641 * Destructors can be added to all nominal types with the Drop trait
11642 * Structs and nullary enum variants may be constants
11643 * Values that cannot be implicitly copied are now automatically moved
11644 without writing `move` explicitly
11645 * `&T` may now be coerced to `*T`
11646 * Coercions happen in `let` statements as well as function calls
11647 * `use` statements now take crate-relative paths
11648 * The module and type namespaces have been merged so that static
11649 method names can be resolved under the trait in which they are
11652 * Improved support for language features
11653 * Trait inheritance works in many scenarios
11654 * More support for explicit self arguments in methods - `self`, `&self`
11655 `@self`, and `~self` all generally work as expected
11656 * Static methods work in more situations
11657 * Experimental: Traits may declare default methods for the implementations
11661 * New condition handling system in `core::condition`
11662 * Timsort added to `std::sort`
11663 * New priority queue, `std::priority_queue`
11664 * Pipes for serializable types, `std::flatpipes'
11665 * Serialization overhauled to be trait-based
11666 * Expanded `getopts` definitions
11667 * Moved futures to `std`
11668 * More functions are pure now
11669 * `core::comm` renamed to `oldcomm`. Still deprecated
11670 * `rustdoc` and `cargo` are libraries now
11673 * Added a preliminary REPL, `rusti`
11674 * License changed from MIT to dual MIT/APL2
11677 Version 0.4 (2012-10-15)
11678 ==========================
11680 * ~2000 changes, numerous bugfixes
11683 * All keywords are now strict and may not be used as identifiers anywhere
11684 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11685 'of', 'with', 'to', 'class'.
11686 * Classes are replaced with simpler structs
11687 * Explicit method self types
11688 * `ret` became `return` and `alt` became `match`
11689 * `import` is now `use`; `use is now `extern mod`
11690 * `extern mod { ... }` is now `extern { ... }`
11691 * `use mod` is the recommended way to import modules
11692 * `pub` and `priv` replace deprecated export lists
11693 * The syntax of `match` pattern arms now uses fat arrow (=>)
11694 * `main` no longer accepts an args vector; use `os::args` instead
11697 * Trait implementations are now coherent, ala Haskell typeclasses
11698 * Trait methods may be static
11699 * Argument modes are deprecated
11700 * Borrowed pointers are much more mature and recommended for use
11701 * Strings and vectors in the static region are stored in constant memory
11702 * Typestate was removed
11703 * Resolution rewritten to be more reliable
11704 * Support for 'dual-mode' data structures (freezing and thawing)
11707 * Most binary operators can now be overloaded via the traits in
11709 * `std::net::url` for representing URLs
11710 * Sendable hash maps in `core::send_map`
11711 * `core::task' gained a (currently unsafe) task-local storage API
11714 * An efficient new intertask communication primitive called the pipe,
11715 along with a number of higher-level channel types, in `core::pipes`
11716 * `std::arc`, an atomically reference counted, immutable, shared memory
11718 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11719 * Futures are now based on pipes and sendable
11720 * More robust linked task failure
11721 * Improved task builder API
11724 * Improved error reporting
11725 * Preliminary JIT support
11726 * Preliminary work on precise GC
11727 * Extensive architectural improvements to rustc
11728 * Begun a transition away from buggy C++-based reflection (shape) code to
11729 Rust-based (visitor) code
11730 * All hash functions and tables converted to secure, randomized SipHash
11733 Version 0.3 (2012-07-12)
11734 ========================
11736 * ~1900 changes, numerous bugfixes
11738 * New coding conveniences
11739 * Integer-literal suffix inference
11740 * Per-item control over warnings, errors
11741 * #[cfg(windows)] and #[cfg(unix)] attributes
11742 * Documentation comments
11743 * More compact closure syntax
11744 * 'do' expressions for treating higher-order functions as
11746 * *-patterns (wildcard extended to all constructor fields)
11749 * Name resolution pass and exhaustiveness checker rewritten
11750 * Region pointers and borrow checking supersede alias
11752 * Init-ness checking is now provided by a region-based liveness
11753 pass instead of the typestate pass; same for last-use analysis
11754 * Extensive work on region pointers
11756 * Experimental new language features
11757 * Slices and fixed-size, interior-allocated vectors
11758 * #!-comments for lang versioning, shell execution
11759 * Destructors and iface implementation for classes;
11760 type-parameterized classes and class methods
11761 * 'const' type kind for types that can be used to implement
11762 shared-memory concurrency patterns
11766 * Removal of various obsolete features
11767 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11768 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11770 * Constructs: do-while loops ('do' repurposed), fn binding,
11771 resources (replaced by destructors)
11773 * Compiler reorganization
11774 * Syntax-layer of compiler split into separate crate
11775 * Clang (from LLVM project) integrated into build
11776 * Typechecker split into sub-modules
11779 * New time functions
11780 * Extension methods for many built-in types
11781 * Arc: atomic-refcount read-only / exclusive-use shared cells
11782 * Par: parallel map and search routines
11783 * Extensive work on libuv interface
11784 * Much vector code moved to libraries
11785 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11786 #include, #include_str, #include_bin
11788 * Tool improvements
11789 * Cargo automatically resolves dependencies
11792 Version 0.2 (2012-03-29)
11793 =========================
11795 * >1500 changes, numerous bugfixes
11797 * New docs and doc tooling
11799 * New port: FreeBSD x86_64
11801 * Compilation model enhancements
11802 * Generics now specialized, multiply instantiated
11803 * Functions now inlined across separate crates
11805 * Scheduling, stack and threading fixes
11806 * Noticeably improved message-passing performance
11807 * Explicit schedulers
11811 * Experimental new language features
11812 * Operator overloading
11816 * Various language extensions
11817 * C-callback function types: 'crust fn ...'
11818 * Infinite-loop construct: 'loop { ... }'
11819 * Shorten 'mutable' to 'mut'
11820 * Required mutable-local qualifier: 'let mut ...'
11821 * Basic glob-exporting: 'export foo::*;'
11822 * Alt now exhaustive, 'alt check' for runtime-checked
11823 * Block-function form of 'for' loop, with 'break' and 'ret'.
11826 * AST quasi-quote syntax extension
11827 * Revived libuv interface
11828 * New modules: core::{future, iter}, std::arena
11829 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11830 * Extensive cleanup, regularization in libstd, libcore
11833 Version 0.1 (2012-01-20)
11834 ===============================
11836 * Most language features work, including:
11837 * Unique pointers, unique closures, move semantics
11838 * Interface-constrained generics
11839 * Static interface dispatch
11841 * Multithread task scheduling
11842 * Typestate predicates
11843 * Failure unwinding, destructors
11844 * Pattern matching and destructuring assignment
11845 * Lightweight block-lambda syntax
11846 * Preliminary macro-by-example
11848 * Compiler works with the following configurations:
11849 * Linux: x86 and x86_64 hosts and targets
11850 * macOS: x86 and x86_64 hosts and targets
11851 * Windows: x86 hosts and targets
11853 * Cross compilation / multi-target configuration supported.
11855 * Preliminary API-documentation and package-management tools included.
11859 * Documentation is incomplete.
11861 * Performance is below intended target.
11863 * Standard library APIs are subject to extensive change, reorganization.
11865 * Language-level versioning is not yet operational - future code will
11866 break unexpectedly.