1 Version 1.64.0 (2022-09-22)
2 ===========================
6 - [make `const_err` show up in future breakage reports](https://github.com/rust-lang/rust/pull/97743/)
7 - [allow unions with mutable references and tuples of allowed types](https://github.com/rust-lang/rust/pull/97995/)
8 - 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/)
9 - 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.
13 - 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/)
14 - [Keep unstable target features for asm feature checking](https://github.com/rust-lang/rust/pull/99155/)
15 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
16 - Refer to Rust's [platform support page][platform-support-doc] for more
17 information on Rust's tiered platform support.
18 - [Only compile #[used] as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
19 - [sess: stabilize `-Zterminal-width` as `--diagnostic-width`](https://github.com/rust-lang/rust/pull/95635/)
20 - [Fix repr(align) enum handling](https://github.com/rust-lang/rust/pull/96814/)
21 - [Suggest defining variable as mutable on `&mut _` type mismatch in pats](https://github.com/rust-lang/rust/pull/98431/)
22 - [Emit warning when named arguments are used positionally in format](https://github.com/rust-lang/rust/pull/98580/)
23 - [Add support for link-flavor rust-lld for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
24 - [Do not mention private types from other crates as impl candidates](https://github.com/rust-lang/rust/pull/99091/)
28 - [Implement network primitives with ideal Rust layout, not C system layout](https://github.com/rust-lang/rust/pull/78802/)
29 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
30 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
31 - [Enforce that layout size fits in isize in Layout](https://github.com/rust-lang/rust/pull/95295/)
32 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
33 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
34 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
35 - [ptr::copy and ptr::swap are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
36 - [Add assertion that `transmute_copy`'s U is not larger than T](https://github.com/rust-lang/rust/pull/98839/)
37 - [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.
38 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
39 - [mem::uninitialized: mitigate many incorrect uses of this function](https://github.com/rust-lang/rust/pull/99182/)
44 - [`ffi::CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html)
45 - [`ffi::CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html)
46 - [`ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesWithNulError.html)
47 - [`ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromVecWithNulError.html)
48 - [`ffi::IntoStringError`](https://doc.rust-lang.org/stable/std/ffi/struct.IntoStringError.html)
49 - [`ffi::NulError`](https://doc.rust-lang.org/stable/std/ffi/struct.NulError.html)
50 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
51 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
52 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
53 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
54 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
55 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
56 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
57 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
58 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
59 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
60 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
61 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
62 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
63 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
64 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
65 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
66 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
67 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
68 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
69 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
70 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
71 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
72 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
73 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
74 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
75 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
76 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
77 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
78 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
79 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
80 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
81 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
83 These APIs are now usable in const contexts:
85 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
89 - Packages can now inherit settings from the workspace so that the settings
90 can be centralized in one place. See
91 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
93 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
94 for more details on how to define these common settings.
95 [#10859](https://github.com/rust-lang/cargo/pull/10859)
96 - Cargo commands can now accept multiple `--target` flags to build for
97 multiple targets at once, and the
98 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
99 config option may now take an array of multiple targets.
100 [#10766](https://github.com/rust-lang/cargo/pull/10766)
101 - The `--jobs` argument can now take a negative number to count backwards from
103 [#10844](https://github.com/rust-lang/cargo/pull/10844)
104 - `cargo add` will now update `Cargo.lock`.
105 [#10902](https://github.com/rust-lang/cargo/pull/10902)
107 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
108 flag to `cargo rustc` to override the crate type.
109 [#10838](https://github.com/rust-lang/cargo/pull/10838)
110 - Significantly improved the performance fetching git dependencies from GitHub
111 when using a hash in the `rev` field.
112 [#10079](https://github.com/rust-lang/cargo/pull/10079)
116 - [Let rust-analyzer ship on stable, non-preview](https://github.com/rust-lang/rust/pull/98640/)
120 - 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/)
121 - [Implement network primitives with ideal Rust layout, not C system layout](https://github.com/rust-lang/rust/pull/78802/)
122 - [Add assertion that `transmute_copy`'s U is not larger than T](https://github.com/rust-lang/rust/pull/98839/)
123 - [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.
124 - [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.
125 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
126 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
127 - 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/).
128 - [`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.
133 These changes do not affect any public interfaces of Rust, but they represent
134 significant improvements to the performance or internals of rustc and related
137 - 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/)
138 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
139 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
140 - Many improvements to generated code for derives, including performance improvements:
141 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
142 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
143 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
144 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
145 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
146 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
147 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
148 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
149 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
150 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
151 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
153 Version 1.63.0 (2022-08-11)
154 ==========================
158 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
159 - [Modify MIR building to drop repeat expressions with length zero.][95953]
160 - [Remove label/lifetime shadowing warnings.][96296]
161 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
162 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
163 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
164 - [lub: don't bail out due to empty binders.][97867]
168 - [Stabilize the `bundle` native library modifier,][95818] also removing the
169 deprecated `static-nobundle` linking kind.
170 - [Add Apple WatchOS compile targets\*.][95243]
171 - [Add a Windows application manifest to rustc-main.][96737]
173 \* Refer to Rust's [platform support page][platform-support-doc] for more
174 information on Rust's tiered platform support.
178 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
179 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
180 - [`impl Read and Write for VecDeque<u8>`.][95632]
181 - [STD support for the Nintendo 3DS.][95897]
182 - [Use rounding in float to Duration conversion methods.][96051]
183 - [Make write/print macros eagerly drop temporaries.][96455]
184 - [Implement internal traits that enable `[OsStr]::join`.][96881]
185 - [Implement `Hash` for `core::alloc::Layout`.][97034]
186 - [Add capacity documentation for `OsString`.][97202]
187 - [Put a bound on collection misbehavior.][97316]
188 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
189 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
190 - [Document Rust's stance on `/proc/self/mem`.][97837]
197 - [`BinaryHeap::try_reserve`]
198 - [`BinaryHeap::try_reserve_exact`]
199 - [`OsString::try_reserve`]
200 - [`OsString::try_reserve_exact`]
201 - [`PathBuf::try_reserve`]
202 - [`PathBuf::try_reserve_exact`]
203 - [`Path::try_exists`]
204 - [`Ref::filter_map`]
205 - [`RefMut::filter_map`]
206 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
207 - [`ToOwned::clone_into`]
208 - [`Ipv6Addr::to_ipv4_mapped`]
210 - [`unix::io::BorrowedFd<'fd>`]
211 - [`unix::io::OwnedFd`]
212 - [`windows::io::AsHandle`]
213 - [`windows::io::BorrowedHandle<'handle>`]
214 - [`windows::io::OwnedHandle`]
215 - [`windows::io::HandleOrInvalid`]
216 - [`windows::io::HandleOrNull`]
217 - [`windows::io::InvalidHandleError`]
218 - [`windows::io::NullHandleError`]
219 - [`windows::io::AsSocket`]
220 - [`windows::io::BorrowedSocket<'handle>`]
221 - [`windows::io::OwnedSocket`]
224 - [`thread::ScopedJoinHandle`]
226 These APIs are now usable in const contexts:
228 - [`array::from_ref`]
229 - [`slice::from_ref`]
230 - [`intrinsics::copy`]
231 - [`intrinsics::copy_nonoverlapping`]
232 - [`<*const T>::copy_to`]
233 - [`<*const T>::copy_to_nonoverlapping`]
234 - [`<*mut T>::copy_to`]
235 - [`<*mut T>::copy_to_nonoverlapping`]
236 - [`<*mut T>::copy_from`]
237 - [`<*mut T>::copy_from_nonoverlapping`]
239 - [`Utf8Error::error_len`]
240 - [`Utf8Error::valid_up_to`]
247 - [Stabilize the `--config path` command-line argument.][cargo/10755]
248 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
253 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
254 errors for invalid attribute arguments that were previously ignored.
255 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
256 duration can differ slightly from what it was.
261 These changes provide no direct user facing benefits, but represent significant
262 improvements to the internals and overall performance of rustc
265 - [Prepare Rust for LLVM opaque pointers.][94214]
267 [94214]: https://github.com/rust-lang/rust/pull/94214/
268 [94530]: https://github.com/rust-lang/rust/pull/94530/
269 [94954]: https://github.com/rust-lang/rust/pull/94954/
270 [95243]: https://github.com/rust-lang/rust/pull/95243/
271 [95565]: https://github.com/rust-lang/rust/pull/95565/
272 [95632]: https://github.com/rust-lang/rust/pull/95632/
273 [95818]: https://github.com/rust-lang/rust/pull/95818/
274 [95897]: https://github.com/rust-lang/rust/pull/95897/
275 [95953]: https://github.com/rust-lang/rust/pull/95953/
276 [96051]: https://github.com/rust-lang/rust/pull/96051/
277 [96296]: https://github.com/rust-lang/rust/pull/96296/
278 [96455]: https://github.com/rust-lang/rust/pull/96455/
279 [96737]: https://github.com/rust-lang/rust/pull/96737/
280 [96868]: https://github.com/rust-lang/rust/pull/96868/
281 [96881]: https://github.com/rust-lang/rust/pull/96881/
282 [96885]: https://github.com/rust-lang/rust/pull/96885/
283 [96959]: https://github.com/rust-lang/rust/pull/96959/
284 [97034]: https://github.com/rust-lang/rust/pull/97034/
285 [97202]: https://github.com/rust-lang/rust/pull/97202/
286 [97316]: https://github.com/rust-lang/rust/pull/97316/
287 [97652]: https://github.com/rust-lang/rust/pull/97652/
288 [97675]: https://github.com/rust-lang/rust/pull/97675/
289 [97803]: https://github.com/rust-lang/rust/pull/97803/
290 [97837]: https://github.com/rust-lang/rust/pull/97837/
291 [97867]: https://github.com/rust-lang/rust/pull/97867/
292 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
293 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
295 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
296 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
297 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
298 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
299 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
300 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
301 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
302 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
303 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
304 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
305 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
306 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
307 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
308 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
309 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
310 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
311 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
312 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
313 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
314 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
315 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
316 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
317 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
318 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
319 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
320 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
321 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
322 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
323 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
324 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
326 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
327 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
328 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
329 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
330 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
331 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
332 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
333 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
334 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
335 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
336 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
337 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
338 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
339 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
340 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
341 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
343 Version 1.62.1 (2022-07-19)
344 ==========================
346 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
347 library, and also mitigates a CPU vulnerability on Intel SGX.
349 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
350 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
351 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
352 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
353 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
355 [98608]: https://github.com/rust-lang/rust/issues/98608
356 [98890]: https://github.com/rust-lang/rust/issues/98890
357 [98950]: https://github.com/rust-lang/rust/pull/98950
358 [98126]: https://github.com/rust-lang/rust/pull/98126
359 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
361 Version 1.62.0 (2022-06-30)
362 ==========================
367 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
368 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
369 - [Fix constants not getting dropped if part of a diverging expression][94775]
370 - [Support unit struct/enum variant in destructuring assignment][95380]
371 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
372 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
377 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
378 - [Make `unaligned_references` lint deny-by-default][95372]
379 This lint is also a future compatibility lint, and is expected to eventually
381 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
382 - [Reject `#[thread_local]` attribute on non-static items][95006]
383 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
384 - [Implement a lint to warn about unused macro rules][96150]
385 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
387 \* Refer to Rust's [platform support page][platform-support-doc] for more
388 information on Rust's tiered platform support.
393 - [Windows: Use a pipe relay for chaining pipes][95841]
394 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
395 - [Replace RwLock by a futex based one on Linux][95801]
396 - [std: directly use pthread in UNIX parker implementation][96393]
401 - [`bool::then_some`]
405 - [`windows::CommandExt::raw_arg`]
406 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
407 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
408 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
409 - [`FusedIterator for EncodeWide`]
410 - [RDM intrinsics on aarch64][stdarch/1285]
415 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
420 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
422 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
423 - Package ID specs now support `name@version` syntax in addition to the
424 previous `name:version` to align with the behavior in `cargo add` and other
425 tools. `cargo install` and `cargo yank` also now support this syntax so the
426 version does not need to passed as a separate flag.
427 - The `git` and `registry` directories in Cargo's home directory (usually
428 `~/.cargo`) are now marked as cache directories so that they are not
429 included in backups or content indexing (on Windows).
430 - Added automatic `@` argfile support, which will use "response files" if the
431 command-line to `rustc` exceeds the operating system's limit.
436 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
437 the same as the host target.
438 [#10594](https://github.com/rust-lang/cargo/pull/10594)
439 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
440 - [rustdoc: Remove .woff font files][96279]
441 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
442 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
443 complete synchronously][95469].
448 - [Unify ReentrantMutex implementations across all platforms][96042]
450 These changes provide no direct user facing benefits, but represent significant
451 improvements to the internals and overall performance of rustc
454 [93313]: https://github.com/rust-lang/rust/pull/93313/
455 [93969]: https://github.com/rust-lang/rust/pull/93969/
456 [94206]: https://github.com/rust-lang/rust/pull/94206/
457 [94457]: https://github.com/rust-lang/rust/pull/94457/
458 [94775]: https://github.com/rust-lang/rust/pull/94775/
459 [94872]: https://github.com/rust-lang/rust/pull/94872/
460 [95006]: https://github.com/rust-lang/rust/pull/95006/
461 [95035]: https://github.com/rust-lang/rust/pull/95035/
462 [95346]: https://github.com/rust-lang/rust/pull/95346/
463 [95372]: https://github.com/rust-lang/rust/pull/95372/
464 [95380]: https://github.com/rust-lang/rust/pull/95380/
465 [95431]: https://github.com/rust-lang/rust/pull/95431/
466 [95469]: https://github.com/rust-lang/rust/pull/95469/
467 [95705]: https://github.com/rust-lang/rust/pull/95705/
468 [95801]: https://github.com/rust-lang/rust/pull/95801/
469 [95819]: https://github.com/rust-lang/rust/pull/95819/
470 [95841]: https://github.com/rust-lang/rust/pull/95841/
471 [96042]: https://github.com/rust-lang/rust/pull/96042/
472 [96150]: https://github.com/rust-lang/rust/pull/96150/
473 [96268]: https://github.com/rust-lang/rust/pull/96268/
474 [96279]: https://github.com/rust-lang/rust/pull/96279/
475 [96393]: https://github.com/rust-lang/rust/pull/96393/
476 [96436]: https://github.com/rust-lang/rust/pull/96436/
477 [96557]: https://github.com/rust-lang/rust/pull/96557/
478 [96630]: https://github.com/rust-lang/rust/pull/96630/
480 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
481 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
482 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
483 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
484 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
485 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
486 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
487 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
488 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
489 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
491 Version 1.61.0 (2022-05-19)
492 ==========================
497 - [`const fn` signatures can now include generic trait bounds][93827]
498 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
499 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
500 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
505 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
506 - [The `char` type is now described as UTF-32 in debuginfo][89887]
507 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
508 - X86 [`#[target_feature = "adx"]` is now stable][93745]
513 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
514 - [`#[ignore = "…"]` messages are printed when running tests][92714]
515 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
516 - [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.
517 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
518 - [`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.
523 - [`Pin::static_mut`]
524 - [`Pin::static_ref`]
525 - [`Vec::retain_mut`]
526 - [`VecDeque::retain_mut`]
527 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
528 - [`std::os::unix::net::SocketAddr::from_pathname`]
529 - [`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.
530 - [`std::thread::JoinHandle::is_finished`]
532 These APIs are now usable in const contexts:
534 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
535 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
536 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
537 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
538 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
539 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
540 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
541 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
542 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
547 No feature changes, but see compatibility notes.
552 - 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
553 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
554 - (less common) or be updated to use the [`+whole-archive`] modifier.
555 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
556 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
557 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
558 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
559 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
560 - [`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`.
561 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
566 These changes provide no direct user facing benefits, but represent significant
567 improvements to the internals and overall performance of rustc
570 - [debuginfo: Refactor debuginfo generation for types][94261]
571 - [Remove the everybody loops pass][93913]
573 [88375]: https://github.com/rust-lang/rust/pull/88375/
574 [89887]: https://github.com/rust-lang/rust/pull/89887/
575 [90621]: https://github.com/rust-lang/rust/pull/90621/
576 [92285]: https://github.com/rust-lang/rust/pull/92285/
577 [92472]: https://github.com/rust-lang/rust/pull/92472/
578 [92697]: https://github.com/rust-lang/rust/pull/92697/
579 [92714]: https://github.com/rust-lang/rust/pull/92714/
580 [92911]: https://github.com/rust-lang/rust/pull/92911/
581 [93263]: https://github.com/rust-lang/rust/pull/93263/
582 [93745]: https://github.com/rust-lang/rust/pull/93745/
583 [93827]: https://github.com/rust-lang/rust/pull/93827/
584 [93901]: https://github.com/rust-lang/rust/pull/93901/
585 [93913]: https://github.com/rust-lang/rust/pull/93913/
586 [93965]: https://github.com/rust-lang/rust/pull/93965/
587 [94081]: https://github.com/rust-lang/rust/pull/94081/
588 [94261]: https://github.com/rust-lang/rust/pull/94261/
589 [94295]: https://github.com/rust-lang/rust/pull/94295/
590 [94832]: https://github.com/rust-lang/rust/pull/94832/
591 [95016]: https://github.com/rust-lang/rust/pull/95016/
592 [95251]: https://github.com/rust-lang/rust/pull/95251/
593 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
594 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
595 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
596 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
597 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
598 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
599 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
600 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
601 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
602 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
603 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
604 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
605 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
606 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
607 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
608 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
609 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
610 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
611 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
612 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
613 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
614 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
617 Version 1.60.0 (2022-04-07)
618 ==========================
622 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
623 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
627 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
628 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
629 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
630 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
631 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
632 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
633 - [Fix invalid removal of newlines from doc comments][92357]
634 - [Add kernel target for RustyHermit][92670]
635 - [Deny mixing bin crate type with lib crate types][92933]
636 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
637 - [Upgrade to LLVM 14][93577]
639 \* Refer to Rust's [platform support page][platform-support-doc] for more
640 information on Rust's tiered platform support.
644 - [Guarantee call order for `sort_by_cached_key`][89621]
645 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
646 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
647 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
648 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
652 - [`Arc::new_cyclic`][arc_new_cyclic]
653 - [`Rc::new_cyclic`][rc_new_cyclic]
654 - [`slice::EscapeAscii`][slice_escape_ascii]
655 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
656 - [`u8::escape_ascii`][u8_escape_ascii]
657 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
658 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
659 - [`MaybeUninit::assume_init_read`][assume_init_read]
660 - [`i8::abs_diff`][i8_abs_diff]
661 - [`i16::abs_diff`][i16_abs_diff]
662 - [`i32::abs_diff`][i32_abs_diff]
663 - [`i64::abs_diff`][i64_abs_diff]
664 - [`i128::abs_diff`][i128_abs_diff]
665 - [`isize::abs_diff`][isize_abs_diff]
666 - [`u8::abs_diff`][u8_abs_diff]
667 - [`u16::abs_diff`][u16_abs_diff]
668 - [`u32::abs_diff`][u32_abs_diff]
669 - [`u64::abs_diff`][u64_abs_diff]
670 - [`u128::abs_diff`][u128_abs_diff]
671 - [`usize::abs_diff`][usize_abs_diff]
672 - [`Display for io::ErrorKind`][display_error_kind]
673 - [`From<u8> for ExitCode`][from_u8_exit_code]
674 - [`Not for !` (the "never" type)][not_never]
675 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
676 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
680 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
681 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
682 - [Stabilize namespaced and weak dependency features.][cargo/10269]
683 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
684 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
688 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
689 - [Drop rustc-docs from complete profile][93742]
690 - [bootstrap: tidy up flag handling for llvm build][93918]
694 - [Remove compiler-rt linking hack on Android][83822]
695 - [Mitigations for platforms with non-monotonic clocks have been removed from
696 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
697 instant is not guaranteed to be greater than an earlier instant anymore.
698 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
699 saturating to `0` instead][89926]. In the real world the panic happened mostly
700 on platforms with buggy monotonic clock implementations rather than catching
701 programming errors like reversing the start and end times. Such programming
702 errors will now results in `0` rather than a panic.
703 - In a future release we're planning to increase the baseline requirements for
704 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
705 your feedback in [PR #95026][95026].
710 These changes provide no direct user facing benefits, but represent significant
711 improvements to the internals and overall performance of rustc
714 - [Switch all libraries to the 2021 edition][92068]
716 [83822]: https://github.com/rust-lang/rust/pull/83822
717 [86374]: https://github.com/rust-lang/rust/pull/86374
718 [87487]: https://github.com/rust-lang/rust/pull/87487
719 [89621]: https://github.com/rust-lang/rust/pull/89621
720 [89926]: https://github.com/rust-lang/rust/pull/89926
721 [90132]: https://github.com/rust-lang/rust/pull/90132
722 [90247]: https://github.com/rust-lang/rust/pull/90247
723 [91606]: https://github.com/rust-lang/rust/pull/91606
724 [92068]: https://github.com/rust-lang/rust/pull/92068
725 [92300]: https://github.com/rust-lang/rust/pull/92300
726 [92357]: https://github.com/rust-lang/rust/pull/92357
727 [92383]: https://github.com/rust-lang/rust/pull/92383
728 [92630]: https://github.com/rust-lang/rust/pull/92630
729 [92670]: https://github.com/rust-lang/rust/pull/92670
730 [92800]: https://github.com/rust-lang/rust/pull/92800
731 [92933]: https://github.com/rust-lang/rust/pull/92933
732 [93566]: https://github.com/rust-lang/rust/pull/93566
733 [93577]: https://github.com/rust-lang/rust/pull/93577
734 [93658]: https://github.com/rust-lang/rust/pull/93658
735 [93742]: https://github.com/rust-lang/rust/pull/93742
736 [93824]: https://github.com/rust-lang/rust/pull/93824
737 [93918]: https://github.com/rust-lang/rust/pull/93918
738 [95026]: https://github.com/rust-lang/rust/pull/95026
740 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
741 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
742 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
743 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
744 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
746 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
747 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
748 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
749 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
750 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
751 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
752 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
753 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
754 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
755 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
756 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
757 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
758 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
759 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
760 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
761 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
762 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
763 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
764 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
765 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
766 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
767 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
768 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
769 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
770 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
772 Version 1.59.0 (2022-02-24)
773 ==========================
778 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
779 - [Stabilize destructuring assignment][90521]
780 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
781 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
786 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
787 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
788 - [Fix sparc64 ABI for aggregates with floating point members][91003]
789 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
790 - [Add support for riscv64gc-unknown-freebsd][91284]
791 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
792 - [Soft disable incremental compilation][94124]
794 This release disables incremental compilation, unless the user has explicitly
795 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
796 This is due to a known and relatively frequently occurring bug in incremental
797 compilation, which causes builds to issue internal compiler errors. This
798 particular bug is already fixed on nightly, but that fix has not yet rolled out
799 to stable and is deemed too risky for a direct stable backport.
801 As always, we encourage users to test with nightly and report bugs so that we
802 can track failures and fix issues earlier.
804 See [94124] for more details.
806 [94124]: https://github.com/rust-lang/rust/issues/94124
811 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
816 - [`std::thread::available_parallelism`][available_parallelism]
817 - [`Result::copied`][result-copied]
818 - [`Result::cloned`][result-cloned]
819 - [`arch::asm!`][asm]
820 - [`arch::global_asm!`][global_asm]
821 - [`ops::ControlFlow::is_break`][is_break]
822 - [`ops::ControlFlow::is_continue`][is_continue]
823 - [`TryFrom<char> for u8`][try_from_char_u8]
824 - [`char::TryFromCharError`][try_from_char_err]
825 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
827 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
828 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
829 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
830 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
831 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
832 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
833 - [`DoubleEndedIterator for ToLowercase`][lowercase]
834 - [`DoubleEndedIterator for ToUppercase`][uppercase]
835 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
836 - [`UnwindSafe for Once`][unwindsafe_once]
837 - [`RefUnwindSafe for Once`][refunwindsafe_once]
838 - [armv8 neon intrinsics for aarch64][stdarch/1266]
842 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
843 - [`mem::MaybeUninit::assume_init`][muninit_init]
844 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
845 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
850 - [Stabilize the `strip` profile option][cargo/10088]
851 - [Stabilize future-incompat-report][cargo/10165]
852 - [Support abbreviating `--release` as `-r`][cargo/10133]
853 - [Support `term.quiet` configuration][cargo/10152]
854 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
859 - [Refactor weak symbols in std::sys::unix][90846]
860 This may add new, versioned, symbols when building with a newer glibc, as the
861 standard library uses weak linkage rather than dynamically attempting to load
862 certain symbols at runtime.
863 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
864 This adds a future compatibility lint to supporting the use of cfg_attr
865 wrapping either crate_type or crate_name specification within Rust files;
866 it is recommended that users migrate to setting the equivalent command line
868 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
869 This may expose new names, leading to conflicts with preexisting names in a
870 given namespace and a compilation failure.
871 - [Cargo will document libraries before binaries.][cargo/10172]
872 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
873 - [Weaken guarantee around advancing underlying iterators in zip][83791]
874 - [Make split_inclusive() on an empty slice yield an empty output][89825]
875 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
876 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
881 These changes provide no direct user facing benefits, but represent significant
882 improvements to the internals and overall performance of rustc
885 - [Fix many cases of normalization-related ICEs][91255]
886 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
887 - [Store liveness in interval sets for region inference][90637]
889 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
890 unstable feature.][91867]
892 [91867]: https://github.com/rust-lang/rust/issues/91867
893 [83744]: https://github.com/rust-lang/rust/pull/83744/
894 [83791]: https://github.com/rust-lang/rust/pull/83791/
895 [85013]: https://github.com/rust-lang/rust/pull/85013/
896 [89825]: https://github.com/rust-lang/rust/pull/89825/
897 [89999]: https://github.com/rust-lang/rust/pull/89999/
898 [90128]: https://github.com/rust-lang/rust/pull/90128/
899 [90207]: https://github.com/rust-lang/rust/pull/90207/
900 [90521]: https://github.com/rust-lang/rust/pull/90521/
901 [90586]: https://github.com/rust-lang/rust/pull/90586/
902 [90637]: https://github.com/rust-lang/rust/pull/90637/
903 [90833]: https://github.com/rust-lang/rust/pull/90833/
904 [90846]: https://github.com/rust-lang/rust/pull/90846/
905 [91003]: https://github.com/rust-lang/rust/pull/91003/
906 [91172]: https://github.com/rust-lang/rust/pull/91172/
907 [91255]: https://github.com/rust-lang/rust/pull/91255/
908 [91284]: https://github.com/rust-lang/rust/pull/91284/
909 [91535]: https://github.com/rust-lang/rust/pull/91535/
910 [91593]: https://github.com/rust-lang/rust/pull/91593/
911 [91728]: https://github.com/rust-lang/rust/pull/91728/
912 [91878]: https://github.com/rust-lang/rust/pull/91878/
913 [91896]: https://github.com/rust-lang/rust/pull/91896/
914 [91926]: https://github.com/rust-lang/rust/pull/91926/
915 [91984]: https://github.com/rust-lang/rust/pull/91984/
916 [92020]: https://github.com/rust-lang/rust/pull/92020/
917 [92034]: https://github.com/rust-lang/rust/pull/92034/
918 [92137]: https://github.com/rust-lang/rust/pull/92137/
919 [92483]: https://github.com/rust-lang/rust/pull/92483/
920 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
921 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
922 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
923 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
924 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
925 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
926 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
927 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
929 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
930 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
931 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
932 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
933 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
934 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
935 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
936 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
937 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
938 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
939 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
940 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
941 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
942 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
943 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
944 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
945 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
946 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
947 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
948 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
949 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
950 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
951 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
952 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
953 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
954 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
956 Version 1.58.1 (2022-01-19)
957 ===========================
959 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
960 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
961 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
962 * [Fix wrong error message displayed when some imports are missing][91254]
963 * [Fix rustfmt not formatting generated files from stdin][92912]
965 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
966 [91254]: https://github.com/rust-lang/rust/pull/91254
967 [92912]: https://github.com/rust-lang/rust/pull/92912
968 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
969 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
971 Version 1.58.0 (2022-01-13)
972 ==========================
977 - [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.
978 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
979 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
984 - [Add LLVM CFI support to the Rust compiler][89652]
985 - [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.
986 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
987 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
988 - [Update the minimum external LLVM to 12][90175]
989 - [Add `x86_64-unknown-none` at Tier 3*][89062]
990 - [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.
991 - [Don't abort compilation after giving a lint error][87337]
992 - [Error messages point at the source of trait bound obligations in more places][89580]
994 \* Refer to Rust's [platform support page][platform-support-doc] for more
995 information on Rust's tiered platform support.
1000 - [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.
1001 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
1002 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
1003 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
1004 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
1005 - [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).
1010 - [`Metadata::is_symlink`]
1011 - [`Path::is_symlink`]
1012 - [`{integer}::saturating_div`]
1013 - [`Option::unwrap_unchecked`]
1014 - [`Result::unwrap_unchecked`]
1015 - [`Result::unwrap_err_unchecked`]
1018 These APIs are now usable in const contexts:
1021 - [`Duration::checked_add`]
1022 - [`Duration::saturating_add`]
1023 - [`Duration::checked_sub`]
1024 - [`Duration::saturating_sub`]
1025 - [`Duration::checked_mul`]
1026 - [`Duration::saturating_mul`]
1027 - [`Duration::checked_div`]
1032 - [Add --message-format for install command][cargo/10107]
1033 - [Warn when alias shadows external subcommand][cargo/10082]
1038 - [Show all Deref implementations recursively in rustdoc][90183]
1039 - [Use computed visibility in rustdoc][88447]
1044 - [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.
1045 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1046 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1047 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1048 - [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.
1049 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1054 These changes provide no direct user facing benefits, but represent significant
1055 improvements to the internals and overall performance of rustc
1058 - [Implement coherence checks for negative trait impls][90104]
1059 - [Add rustc lint, warning when iterating over hashmaps][89558]
1060 - [Optimize live point computation][90491]
1061 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1062 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1064 [87337]: https://github.com/rust-lang/rust/pull/87337/
1065 [87467]: https://github.com/rust-lang/rust/pull/87467/
1066 [87704]: https://github.com/rust-lang/rust/pull/87704/
1067 [88041]: https://github.com/rust-lang/rust/pull/88041/
1068 [88447]: https://github.com/rust-lang/rust/pull/88447/
1069 [88601]: https://github.com/rust-lang/rust/pull/88601/
1070 [89062]: https://github.com/rust-lang/rust/pull/89062/
1071 [89174]: https://github.com/rust-lang/rust/pull/89174/
1072 [89551]: https://github.com/rust-lang/rust/pull/89551/
1073 [89558]: https://github.com/rust-lang/rust/pull/89558/
1074 [89580]: https://github.com/rust-lang/rust/pull/89580/
1075 [89652]: https://github.com/rust-lang/rust/pull/89652/
1076 [90041]: https://github.com/rust-lang/rust/pull/90041/
1077 [90058]: https://github.com/rust-lang/rust/pull/90058/
1078 [90104]: https://github.com/rust-lang/rust/pull/90104/
1079 [90117]: https://github.com/rust-lang/rust/pull/90117/
1080 [90175]: https://github.com/rust-lang/rust/pull/90175/
1081 [90183]: https://github.com/rust-lang/rust/pull/90183/
1082 [90297]: https://github.com/rust-lang/rust/pull/90297/
1083 [90329]: https://github.com/rust-lang/rust/pull/90329/
1084 [90361]: https://github.com/rust-lang/rust/pull/90361/
1085 [90417]: https://github.com/rust-lang/rust/pull/90417/
1086 [90473]: https://github.com/rust-lang/rust/pull/90473/
1087 [90491]: https://github.com/rust-lang/rust/pull/90491/
1088 [90733]: https://github.com/rust-lang/rust/pull/90733/
1089 [90833]: https://github.com/rust-lang/rust/pull/90833/
1090 [90846]: https://github.com/rust-lang/rust/pull/90846/
1091 [91026]: https://github.com/rust-lang/rust/pull/91026/
1092 [91207]: https://github.com/rust-lang/rust/pull/91207/
1093 [91255]: https://github.com/rust-lang/rust/pull/91255/
1094 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1095 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1096 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1097 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1098 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1099 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1100 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1101 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1102 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1103 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1105 Version 1.57.0 (2021-12-02)
1106 ==========================
1111 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1112 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1113 - [Allow panicking in constant evaluation.][89508]
1114 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1119 - [Create more accurate debuginfo for vtables.][89597]
1120 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1121 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1122 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1123 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1125 \* Refer to Rust's [platform support page][platform-support-doc] for more
1126 information on Rust's tiered platform support.
1131 - [Avoid allocations and copying in `Vec::leak`][89337]
1132 - [Add `#[repr(i8)]` to `Ordering`][89507]
1133 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1134 - [Update to Unicode 14.0][89614]
1135 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1136 when ignoring their return value. This helps catch mistakes such as expecting
1137 a function to mutate a value in place rather than return a new value.
1142 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1143 - [`[T; N]::as_slice`][`array::as_slice`]
1144 - [`collections::TryReserveError`]
1145 - [`HashMap::try_reserve`]
1146 - [`HashSet::try_reserve`]
1147 - [`String::try_reserve`]
1148 - [`String::try_reserve_exact`]
1149 - [`Vec::try_reserve`]
1150 - [`Vec::try_reserve_exact`]
1151 - [`VecDeque::try_reserve`]
1152 - [`VecDeque::try_reserve_exact`]
1153 - [`Iterator::map_while`]
1154 - [`iter::MapWhile`]
1155 - [`proc_macro::is_available`]
1156 - [`Command::get_program`]
1157 - [`Command::get_args`]
1158 - [`Command::get_envs`]
1159 - [`Command::get_current_dir`]
1163 These APIs are now usable in const contexts:
1165 - [`hint::unreachable_unchecked`]
1170 - [Stabilize custom profiles][cargo/9943]
1175 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1176 This will break some builds that set `#![deny(dead_code)]`.
1180 These changes provide no direct user facing benefits, but represent significant
1181 improvements to the internals and overall performance of rustc
1184 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1186 [85200]: https://github.com/rust-lang/rust/pull/85200/
1187 [86191]: https://github.com/rust-lang/rust/pull/86191/
1188 [87220]: https://github.com/rust-lang/rust/pull/87220/
1189 [87260]: https://github.com/rust-lang/rust/pull/87260/
1190 [88321]: https://github.com/rust-lang/rust/pull/88321/
1191 [88529]: https://github.com/rust-lang/rust/pull/88529/
1192 [88690]: https://github.com/rust-lang/rust/pull/88690/
1193 [88952]: https://github.com/rust-lang/rust/pull/88952/
1194 [89337]: https://github.com/rust-lang/rust/pull/89337/
1195 [89507]: https://github.com/rust-lang/rust/pull/89507/
1196 [89508]: https://github.com/rust-lang/rust/pull/89508/
1197 [89582]: https://github.com/rust-lang/rust/pull/89582/
1198 [89597]: https://github.com/rust-lang/rust/pull/89597/
1199 [89614]: https://github.com/rust-lang/rust/pull/89614/
1200 [89692]: https://github.com/rust-lang/rust/issues/89692/
1201 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1202 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1203 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1204 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1205 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1206 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1207 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1208 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1209 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1210 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1211 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1212 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1213 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1214 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1215 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1216 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1217 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1218 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1219 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1220 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1221 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1223 Version 1.56.1 (2021-11-01)
1224 ===========================
1226 - New lints to detect the presence of bidirectional-override Unicode
1227 codepoints in the compiled source code ([CVE-2021-42574])
1229 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1231 Version 1.56.0 (2021-10-21)
1232 ========================
1237 - [The 2021 Edition is now stable.][rust#88100]
1238 See [the edition guide][rust-2021-edition-guide] for more details.
1239 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1240 - [Union field access is permitted in `const fn`.][rust#85769]
1242 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1247 - [Upgrade to LLVM 13.][rust#87570]
1248 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1249 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1250 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1251 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1252 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1253 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1254 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1256 \* Refer to Rust's [platform support page][platform-support-doc] for more
1257 information on Rust's tiered platform support.
1262 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1263 The Windows console still requires valid Unicode, but this change allows
1264 splitting a UTF-8 character across multiple write calls. This allows, for
1265 instance, programs that just read and write data buffers (e.g. copying a file
1266 to stdout) without regard for Unicode or character boundaries.
1267 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1268 For this use case, atomics scale much better under contention.
1269 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1270 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1271 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1272 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1273 - [Treat invalid environment variable names as non-existent.][rust#86183]
1274 Previously, the environment functions would panic if given a variable name
1275 with an internal null character or equal sign (`=`). Now, these functions will
1276 just treat such names as non-existent variables, since the OS cannot represent
1277 the existence of a variable with such a name.
1282 - [`std::os::unix::fs::chroot`]
1283 - [`UnsafeCell::raw_get`]
1284 - [`BufWriter::into_parts`]
1285 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1286 These APIs were previously stable in `std`, but are now also available in `core`.
1287 - [`Vec::shrink_to`]
1288 - [`String::shrink_to`]
1289 - [`OsString::shrink_to`]
1290 - [`PathBuf::shrink_to`]
1291 - [`BinaryHeap::shrink_to`]
1292 - [`VecDeque::shrink_to`]
1293 - [`HashMap::shrink_to`]
1294 - [`HashSet::shrink_to`]
1296 These APIs are now usable in const contexts:
1298 - [`std::mem::transmute`]
1299 - [`[T]::first`][`slice::first`]
1300 - [`[T]::split_first`][`slice::split_first`]
1301 - [`[T]::last`][`slice::last`]
1302 - [`[T]::split_last`][`slice::split_last`]
1307 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1308 This has no effect at present on dependency version selection.
1309 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1310 that support Rust code to include a crate's specified minimum version in the test matrix for that
1316 - [Update to new argument parsing rules on Windows.][rust#87580]
1317 This adjusts Rust's standard library to match the behavior of the standard
1318 libraries for C/C++. The rules have changed slightly over time, and this PR
1319 brings us to the latest set of rules (changed in 2008).
1320 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1321 This was already not supported by LLVM; this change surfaces this lack of
1322 support with a better error message.
1323 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1324 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1325 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1326 may return different values on glibc <= 2.24.][rust#81825]
1327 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1328 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1329 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1330 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1334 These changes provide no direct user facing benefits, but represent significant
1335 improvements to the internals and overall performance of rustc
1338 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1339 This improves the performance of most Rust builds.
1340 - [Unify representation of macros in internal data structures.][rust#88019]
1341 This change fixes a host of bugs with the handling of macros by the compiler,
1344 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1345 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1346 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1347 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1348 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1349 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1350 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1351 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1352 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1353 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1354 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1355 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1356 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1357 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1358 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1359 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1360 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1361 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1362 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1363 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1364 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1365 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1366 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1367 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1368 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1369 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1370 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1371 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1372 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1373 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1374 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1375 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1376 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1377 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1378 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1379 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1380 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1381 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1382 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1383 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1384 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1385 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1387 Version 1.55.0 (2021-09-09)
1388 ============================
1392 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1393 will end at the maximum value of the integer.][83918]
1394 - [You can now explicitly import the prelude of different editions
1395 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1399 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1401 \* Refer to Rust's [platform support page][platform-support-doc] for more
1402 information on Rust's tiered platform support.
1407 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1408 These improvements should in general provide faster string parsing of floats,
1409 no longer reject certain valid floating point values, and reduce
1410 the produced code size for non-stripped artifacts.
1411 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1418 - [`IntoInnerError::into_error`]
1419 - [`IntoInnerError::into_parts`]
1420 - [`MaybeUninit::assume_init_mut`]
1421 - [`MaybeUninit::assume_init_ref`]
1422 - [`MaybeUninit::write`]
1424 - [`ops::ControlFlow`]
1426 - [`x86::_bittestandcomplement`]
1427 - [`x86::_bittestandreset`]
1428 - [`x86::_bittestandset`]
1429 - [`x86_64::_bittest64`]
1430 - [`x86_64::_bittestandcomplement64`]
1431 - [`x86_64::_bittestandreset64`]
1432 - [`x86_64::_bittestandset64`]
1434 The following previously stable functions are now `const`.
1436 - [`str::from_utf8_unchecked`]
1441 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1442 rustc in parallel such as when using `cargo test`.][cargo/9675]
1443 - [The package definition in `cargo metadata` now includes the `"default_run"`
1444 field from the manifest.][cargo/9550]
1445 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1446 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1447 of packages.][cargo/9663]
1451 - [Added "Go to item on exact match" search option.][85876]
1452 - [The "Implementors" section on traits no longer shows redundant
1453 method definitions.][85970]
1454 - [Trait implementations are toggled open by default.][86260] This should make the
1455 implementations more searchable by tools like `CTRL+F` in your browser.
1456 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1457 through type aliases.][86334]
1458 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1459 "Trait Implementations" section.][86513]
1464 - [std functions that return an `io::Error` will no longer use the
1465 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1466 kinds of errors could be categorised [into newer more specific `ErrorKind`
1467 variants][79965], and that they do not represent a user error.
1468 - [Using environment variable names with `process::Command` on Windows now
1469 behaves as expected.][85270] Previously using envionment variables with
1470 `Command` would cause them to be ASCII-uppercased.
1471 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1472 with `rustdoc::`][86849]
1473 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1474 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1475 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1478 [86849]: https://github.com/rust-lang/rust/pull/86849
1479 [86513]: https://github.com/rust-lang/rust/pull/86513
1480 [86334]: https://github.com/rust-lang/rust/pull/86334
1481 [86260]: https://github.com/rust-lang/rust/pull/86260
1482 [85970]: https://github.com/rust-lang/rust/pull/85970
1483 [85876]: https://github.com/rust-lang/rust/pull/85876
1484 [83572]: https://github.com/rust-lang/rust/pull/83572
1485 [86294]: https://github.com/rust-lang/rust/pull/86294
1486 [86858]: https://github.com/rust-lang/rust/pull/86858
1487 [86761]: https://github.com/rust-lang/rust/pull/86761
1488 [85746]: https://github.com/rust-lang/rust/pull/85746
1489 [85270]: https://github.com/rust-lang/rust/pull/85270
1490 [83918]: https://github.com/rust-lang/rust/pull/83918
1491 [79965]: https://github.com/rust-lang/rust/pull/79965
1492 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1493 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1494 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1495 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1496 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1497 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1498 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1499 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1500 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1501 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1502 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1503 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1504 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1505 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1506 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1507 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1508 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1509 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1510 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1511 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1512 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1513 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1516 Version 1.54.0 (2021-07-29)
1517 ============================
1520 -----------------------
1522 - [You can now use macros for values in some built-in attributes.][83366]
1523 This primarily allows you to call macros within the `#[doc]` attribute. For
1524 example, to include external documentation in your crate, you can now write
1527 #![doc = include_str!("README.md")]
1530 - [You can now cast between unsized slice types (and types which contain
1531 unsized slices) in `const fn`.][85078]
1532 - [You can now use multiple generic lifetimes with `impl Trait` where the
1533 lifetimes don't explicitly outlive another.][84701] In code this means
1534 that you can now have `impl Trait<'a, 'b>` where as before you could
1535 only have `impl Trait<'a, 'b> where 'b: 'a`.
1538 -----------------------
1540 - [Rustc will now search for custom JSON targets in
1541 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1542 directory.][83800] You can find your sysroot directory by running
1543 `rustc --print sysroot`.
1544 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1545 - [You can now use `#[target_feature]` on safe functions when targeting
1546 WebAssembly platforms.][84988]
1547 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1548 - [Added tier 3\* support for `bpfel-unknown-none`
1549 and `bpfeb-unknown-none`.][79608]
1550 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1552 \* Refer to Rust's [platform support page][platform-support-doc] for more
1553 information on Rust's tiered platform support.
1556 -----------------------
1558 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1559 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1560 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1561 - [The implementations of vendor intrinsics in core::arch have been
1562 significantly refactored.][83278] The main user-visible changes are
1563 a 50% reduction in the size of libcore.rlib and stricter validation
1564 of constant operands passed to intrinsics. The latter is technically
1565 a breaking change, but allows Rust to more closely match the C vendor
1571 - [`BTreeMap::into_keys`]
1572 - [`BTreeMap::into_values`]
1573 - [`HashMap::into_keys`]
1574 - [`HashMap::into_values`]
1576 - [`VecDeque::binary_search`]
1577 - [`VecDeque::binary_search_by`]
1578 - [`VecDeque::binary_search_by_key`]
1579 - [`VecDeque::partition_point`]
1584 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1585 the dependency graph.][cargo/9520]
1586 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1587 in the tree ][cargo/9499]
1588 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1589 macro dependencies.][cargo/9488]
1590 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1591 This variable points to a directory that integration tests and benches
1592 can use as a "scratchpad" for testing filesystem operations.
1596 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1597 - [Previously unsound code is no longer permitted where different constructors in branches
1598 could require different lifetimes.][85574]
1599 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1600 than before and may reject some previously accepted code.
1601 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1602 when compiled with `codegen-units = 1`.][86063]
1604 [85574]: https://github.com/rust-lang/rust/issues/85574
1605 [86831]: https://github.com/rust-lang/rust/issues/86831
1606 [86063]: https://github.com/rust-lang/rust/issues/86063
1607 [79608]: https://github.com/rust-lang/rust/pull/79608
1608 [84988]: https://github.com/rust-lang/rust/pull/84988
1609 [84701]: https://github.com/rust-lang/rust/pull/84701
1610 [84072]: https://github.com/rust-lang/rust/pull/84072
1611 [85745]: https://github.com/rust-lang/rust/pull/85745
1612 [84744]: https://github.com/rust-lang/rust/pull/84744
1613 [85078]: https://github.com/rust-lang/rust/pull/85078
1614 [84717]: https://github.com/rust-lang/rust/pull/84717
1615 [83800]: https://github.com/rust-lang/rust/pull/83800
1616 [83366]: https://github.com/rust-lang/rust/pull/83366
1617 [83278]: https://github.com/rust-lang/rust/pull/83278
1618 [85292]: https://github.com/rust-lang/rust/pull/85292
1619 [82834]: https://github.com/rust-lang/rust/pull/82834
1620 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1621 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1622 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1623 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1624 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1625 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1626 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1627 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1628 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1629 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1630 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1632 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1634 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1636 Version 1.53.0 (2021-06-17)
1637 ============================
1640 -----------------------
1641 - [You can now use unicode for identifiers.][83799] This allows multilingual
1642 identifiers but still doesn't allow glyphs that are not considered characters
1643 such as `◆` or `🦀`. More specifically you can now use any identifier that
1644 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1645 is the same standard as languages like Python, however Rust uses NFC
1646 normalization which may be different from other languages.
1647 - [You can now specify "or patterns" inside pattern matches.][79278]
1648 Previously you could only use `|` (OR) on complete patterns. E.g.
1652 matches!(x, Some(1) | Some(2));
1654 matches!(x, Some(1 | 2));
1656 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1657 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1658 to change semantics to being a pattern fragment in a future edition.
1661 -----------------------
1662 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1663 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1664 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1666 \* Refer to Rust's [platform support page][platform-support-doc] for more
1667 information on Rust's tiered platform support.
1670 -----------------------
1671 - [Abort messages will now forward to `android_set_abort_message` on
1672 Android platforms when available.][81469]
1673 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1674 - [Arrays of any length now implement `IntoIterator`.][84147]
1675 Currently calling `.into_iter()` as a method on an array will
1676 return `impl Iterator<Item=&T>`, but this may change in a
1677 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1678 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1679 - [`leading_zeros`, and `trailing_zeros` are now available on all
1680 `NonZero` integer types.][84082]
1681 - [`{f32, f64}::from_str` now parse and print special values
1682 (`NaN`, `-0`) according to IEEE 754.][78618]
1683 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1684 - [Add the `BITS` associated constant to all numeric types.][82565]
1688 - [`AtomicBool::fetch_update`]
1689 - [`AtomicPtr::fetch_update`]
1690 - [`BTreeMap::retain`]
1691 - [`BTreeSet::retain`]
1692 - [`BufReader::seek_relative`]
1693 - [`DebugStruct::non_exhaustive`]
1695 - [`Duration::ZERO`]
1696 - [`Duration::is_zero`]
1697 - [`Duration::saturating_add`]
1698 - [`Duration::saturating_mul`]
1699 - [`Duration::saturating_sub`]
1700 - [`ErrorKind::Unsupported`]
1701 - [`Option::insert`]
1702 - [`Ordering::is_eq`]
1703 - [`Ordering::is_ge`]
1704 - [`Ordering::is_gt`]
1705 - [`Ordering::is_le`]
1706 - [`Ordering::is_lt`]
1707 - [`Ordering::is_ne`]
1708 - [`OsStr::is_ascii`]
1709 - [`OsStr::make_ascii_lowercase`]
1710 - [`OsStr::make_ascii_uppercase`]
1711 - [`OsStr::to_ascii_lowercase`]
1712 - [`OsStr::to_ascii_uppercase`]
1713 - [`Peekable::peek_mut`]
1714 - [`Rc::decrement_strong_count`]
1715 - [`Rc::increment_strong_count`]
1716 - [`Vec::extend_from_within`]
1717 - [`array::from_mut`]
1718 - [`array::from_ref`]
1719 - [`cmp::max_by_key`]
1721 - [`cmp::min_by_key`]
1723 - [`f32::is_subnormal`]
1724 - [`f64::is_subnormal`]
1727 -----------------------
1728 - [Cargo now supports git repositories where the default `HEAD` branch is not
1729 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1730 which can handle default branches correctly.
1731 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1732 - [The `authors` field is no longer included in `Cargo.toml` for new
1733 projects.][cargo/9282]
1736 -----------------------
1737 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1738 without hyperlinks.][81764]
1742 - [Implement token-based handling of attributes during expansion][82608]
1743 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1744 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1745 to confusion and potential security vulnerabilities and [is no
1746 longer recommended][ietf6943].
1747 - [The added `BITS` constant may conflict with external definitions.][85667]
1748 In particular, this was known to be a problem in the `lexical-core` crate,
1749 but they have published fixes for semantic versions 0.4 through 0.7. To
1750 update this dependency alone, use `cargo update -p lexical-core`.
1751 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1755 These changes provide no direct user facing benefits, but represent significant
1756 improvements to the internals and overall performance of rustc and
1759 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1760 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1761 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1762 - [Rework rustdoc const type][82873]
1764 [85667]: https://github.com/rust-lang/rust/pull/85667
1765 [83386]: https://github.com/rust-lang/rust/pull/83386
1766 [82771]: https://github.com/rust-lang/rust/pull/82771
1767 [84147]: https://github.com/rust-lang/rust/pull/84147
1768 [84082]: https://github.com/rust-lang/rust/pull/84082
1769 [83799]: https://github.com/rust-lang/rust/pull/83799
1770 [83681]: https://github.com/rust-lang/rust/pull/83681
1771 [83652]: https://github.com/rust-lang/rust/pull/83652
1772 [83387]: https://github.com/rust-lang/rust/pull/83387
1773 [82873]: https://github.com/rust-lang/rust/pull/82873
1774 [82864]: https://github.com/rust-lang/rust/pull/82864
1775 [82608]: https://github.com/rust-lang/rust/pull/82608
1776 [82565]: https://github.com/rust-lang/rust/pull/82565
1777 [80525]: https://github.com/rust-lang/rust/pull/80525
1778 [79278]: https://github.com/rust-lang/rust/pull/79278
1779 [78618]: https://github.com/rust-lang/rust/pull/78618
1780 [77704]: https://github.com/rust-lang/rust/pull/77704
1781 [83941]: https://github.com/rust-lang/rust/pull/83941
1782 [83065]: https://github.com/rust-lang/rust/pull/83065
1783 [81764]: https://github.com/rust-lang/rust/pull/81764
1784 [81469]: https://github.com/rust-lang/rust/pull/81469
1785 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1786 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1787 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1788 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1789 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1790 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1791 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1792 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1793 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1794 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1795 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1796 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1797 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1798 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1799 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1800 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1801 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1802 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1803 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1804 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1805 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1806 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1807 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1808 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1809 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1810 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1811 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1812 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1813 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1814 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1815 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1816 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1817 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1818 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1819 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1820 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1821 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1822 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1823 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1824 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1825 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1828 Version 1.52.1 (2021-05-10)
1829 ============================
1831 This release disables incremental compilation, unless the user has explicitly
1832 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1834 This is due to the widespread, and frequently occurring, breakage encountered by
1835 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1836 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1837 newly added incremental verification are still present in past stable versions,
1838 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1841 These problems only affect incremental builds, so release builds with Cargo
1842 should not be affected unless the user has explicitly opted into incremental.
1843 Debug and check builds are affected.
1845 See [84970] for more details.
1847 [84970]: https://github.com/rust-lang/rust/issues/84970
1849 Version 1.52.0 (2021-05-06)
1850 ============================
1854 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1855 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1856 is allowed by default, and may become a warning or hard error in a
1858 - [You can now cast mutable references to arrays to a pointer of the same type as
1859 the element.][81479]
1863 - [Upgraded the default LLVM to LLVM 12.][81451]
1865 Added tier 3\* support for the following targets.
1867 - [`s390x-unknown-linux-musl`][82166]
1868 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1869 - [`powerpc-unknown-openbsd`][82733]
1871 \* Refer to Rust's [platform support page][platform-support-doc] for more
1872 information on Rust's tiered platform support.
1876 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1877 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1878 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1879 - [All integer division and remainder operations are now `const`.][80962]
1883 - [`Arguments::as_str`]
1885 - [`char::REPLACEMENT_CHARACTER`]
1886 - [`char::UNICODE_VERSION`]
1887 - [`char::decode_utf16`]
1888 - [`char::from_digit`]
1889 - [`char::from_u32_unchecked`]
1890 - [`char::from_u32`]
1891 - [`slice::partition_point`]
1892 - [`str::rsplit_once`]
1893 - [`str::split_once`]
1895 The following previously stable APIs are now `const`.
1897 - [`char::len_utf8`]
1898 - [`char::len_utf16`]
1899 - [`char::to_ascii_uppercase`]
1900 - [`char::to_ascii_lowercase`]
1901 - [`char::eq_ignore_ascii_case`]
1902 - [`u8::to_ascii_uppercase`]
1903 - [`u8::to_ascii_lowercase`]
1904 - [`u8::eq_ignore_ascii_case`]
1908 - [Rustdoc lints are now treated as a tool lint, meaning that
1909 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1910 Using the old style is still allowed, and will become a warning in
1912 - [Rustdoc now supports argument files.][82261]
1913 - [Rustdoc now generates smart punctuation for documentation.][79423]
1914 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1922 - [You can now pass multiple filters to tests.][81356] E.g.
1923 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1924 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1925 allowing you to see `std` symbols when debugging.][82218]
1929 These changes provide no direct user facing benefits, but represent significant
1930 improvements to the internals and overall performance of rustc and
1933 - [Check the result cache before the DepGraph when ensuring queries][81855]
1934 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1935 - [Only store a LocalDefId in some HIR nodes][81611]
1936 - [Store HIR attributes in a side table][79519]
1940 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1941 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1942 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1943 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1944 languages in code blocks.][78429]
1945 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1946 - [Changes in how proc macros handle whitespace may lead to panics when used
1947 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1948 - [Turn `#[derive]` into a regular macro attribute][79078]
1950 [84136]: https://github.com/rust-lang/rust/issues/84136
1951 [80763]: https://github.com/rust-lang/rust/pull/80763
1952 [82166]: https://github.com/rust-lang/rust/pull/82166
1953 [82121]: https://github.com/rust-lang/rust/pull/82121
1954 [81879]: https://github.com/rust-lang/rust/pull/81879
1955 [82261]: https://github.com/rust-lang/rust/pull/82261
1956 [82218]: https://github.com/rust-lang/rust/pull/82218
1957 [82216]: https://github.com/rust-lang/rust/pull/82216
1958 [82202]: https://github.com/rust-lang/rust/pull/82202
1959 [81855]: https://github.com/rust-lang/rust/pull/81855
1960 [81766]: https://github.com/rust-lang/rust/pull/81766
1961 [81744]: https://github.com/rust-lang/rust/pull/81744
1962 [81611]: https://github.com/rust-lang/rust/pull/81611
1963 [81479]: https://github.com/rust-lang/rust/pull/81479
1964 [81451]: https://github.com/rust-lang/rust/pull/81451
1965 [81356]: https://github.com/rust-lang/rust/pull/81356
1966 [80962]: https://github.com/rust-lang/rust/pull/80962
1967 [80553]: https://github.com/rust-lang/rust/pull/80553
1968 [80527]: https://github.com/rust-lang/rust/pull/80527
1969 [79519]: https://github.com/rust-lang/rust/pull/79519
1970 [79423]: https://github.com/rust-lang/rust/pull/79423
1971 [79208]: https://github.com/rust-lang/rust/pull/79208
1972 [78429]: https://github.com/rust-lang/rust/pull/78429
1973 [82733]: https://github.com/rust-lang/rust/pull/82733
1974 [82594]: https://github.com/rust-lang/rust/pull/82594
1975 [79078]: https://github.com/rust-lang/rust/pull/79078
1976 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1977 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1978 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1979 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1980 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1981 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1982 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1983 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1984 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1985 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1986 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1987 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1988 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1989 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1990 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1991 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1992 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1993 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1994 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1995 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1996 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1997 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1999 Version 1.51.0 (2021-03-25)
2000 ============================
2004 - [You can now parameterize items such as functions, traits, and `struct`s by constant
2005 values in addition to by types and lifetimes.][79135] Also known as "const generics"
2006 E.g. you can now write the following. Note: Only values of primitive integers,
2007 `bool`, or `char` types are currently permitted.
2009 struct GenericArray<T, const LENGTH: usize> {
2013 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2014 const fn last(&self) -> Option<&T> {
2018 Some(&self.inner[LENGTH - 1])
2028 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2029 This option controls whether debug information is split across multiple files
2030 or packed into a single file. **Note** This option is unstable on other platforms.
2031 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2032 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2033 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2034 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2036 \* Refer to Rust's [platform support page][platform-support-doc] for more
2037 information on Rust's tiered platform support.
2042 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2043 - [`str` now implements `AsMut<str>`.][80279]
2044 - [`u64` and `u128` now implement `From<char>`.][79502]
2045 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2046 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2047 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2048 - [`io::Empty` now implements `io::Seek`.][78044]
2049 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2050 `T: ?Sized` types.][80764]
2051 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2057 - [`Arc::decrement_strong_count`]
2058 - [`Arc::increment_strong_count`]
2059 - [`Once::call_once_force`]
2060 - [`Peekable::next_if_eq`]
2061 - [`Peekable::next_if`]
2062 - [`Seek::stream_position`]
2063 - [`array::IntoIter`]
2064 - [`panic::panic_any`]
2066 - [`ptr::addr_of_mut!`]
2067 - [`slice::fill_with`]
2068 - [`slice::split_inclusive_mut`]
2069 - [`slice::split_inclusive`]
2070 - [`slice::strip_prefix`]
2071 - [`slice::strip_suffix`]
2072 - [`str::split_inclusive`]
2073 - [`sync::OnceState`]
2075 - [`VecDeque::range`]
2076 - [`VecDeque::range_mut`]
2080 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2081 codegen option.][cargo/9112]
2082 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2083 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2084 to avoid unifying features of dependencies where that unification could be unwanted.
2085 Such as using the same dependency with a `std` feature in a build scripts and
2086 proc-macros, while using the `no-std` feature in the final binary. See the
2087 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2092 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2093 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2094 documentation.][79642]
2096 Various improvements to intra-doc links:
2098 - [You can link to non-path primitives such as `slice`.][80181]
2099 - [You can link to associated items.][74489]
2100 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2104 - [You can now pass `--include-ignored` to tests (e.g. with
2105 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2110 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2111 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2113 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2114 for the distributed artifacts.][81521]
2115 - `armv5te-unknown-linux-gnueabi`
2116 - `sparc64-unknown-linux-gnu`
2117 - `thumbv7neon-unknown-linux-gnueabihf`
2118 - `armv7-unknown-linux-gnueabi`
2119 - `x86_64-unknown-linux-gnux32`
2120 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2125 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2127 [79135]: https://github.com/rust-lang/rust/pull/79135
2128 [74489]: https://github.com/rust-lang/rust/pull/74489
2129 [76934]: https://github.com/rust-lang/rust/pull/76934
2130 [79570]: https://github.com/rust-lang/rust/pull/79570
2131 [80181]: https://github.com/rust-lang/rust/pull/80181
2132 [79642]: https://github.com/rust-lang/rust/pull/79642
2133 [80945]: https://github.com/rust-lang/rust/pull/80945
2134 [80279]: https://github.com/rust-lang/rust/pull/80279
2135 [80053]: https://github.com/rust-lang/rust/pull/80053
2136 [79502]: https://github.com/rust-lang/rust/pull/79502
2137 [75180]: https://github.com/rust-lang/rust/pull/75180
2138 [81521]: https://github.com/rust-lang/rust/pull/81521
2139 [80968]: https://github.com/rust-lang/rust/pull/80968
2140 [80959]: https://github.com/rust-lang/rust/pull/80959
2141 [80718]: https://github.com/rust-lang/rust/pull/80718
2142 [80653]: https://github.com/rust-lang/rust/pull/80653
2143 [80579]: https://github.com/rust-lang/rust/pull/80579
2144 [79998]: https://github.com/rust-lang/rust/pull/79998
2145 [78044]: https://github.com/rust-lang/rust/pull/78044
2146 [81455]: https://github.com/rust-lang/rust/pull/81455
2147 [80764]: https://github.com/rust-lang/rust/pull/80764
2148 [80749]: https://github.com/rust-lang/rust/pull/80749
2149 [80662]: https://github.com/rust-lang/rust/pull/80662
2150 [79134]: https://github.com/rust-lang/rust/pull/79134
2151 [80966]: https://github.com/rust-lang/rust/pull/80966
2152 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2153 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2154 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2155 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2156 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2157 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2158 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2159 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2160 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2161 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2162 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2163 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2164 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2165 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2166 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2167 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2168 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2169 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2170 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2171 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2172 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2173 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2174 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2176 Version 1.50.0 (2021-02-11)
2177 ============================
2180 -----------------------
2181 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2182 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2183 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2186 -----------------------
2187 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2188 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2189 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2190 - [Dropped support for all cloudabi targets.][78439]
2192 \* Refer to Rust's [platform support page][platform-support-doc] for more
2193 information on Rust's tiered platform support.
2196 -----------------------
2198 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2199 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2200 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2201 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2202 up the same amount of space as `File`.
2208 - [`btree_map::Entry::or_insert_with_key`]
2211 - [`hash_map::Entry::or_insert_with_key`]
2215 - [`UnsafeCell::get_mut`]
2217 The following previously stable methods are now `const`.
2219 - [`IpAddr::is_ipv4`]
2220 - [`IpAddr::is_ipv6`]
2221 - [`IpAddr::is_unspecified`]
2222 - [`IpAddr::is_loopback`]
2223 - [`IpAddr::is_multicast`]
2224 - [`Ipv4Addr::octets`]
2225 - [`Ipv4Addr::is_loopback`]
2226 - [`Ipv4Addr::is_private`]
2227 - [`Ipv4Addr::is_link_local`]
2228 - [`Ipv4Addr::is_multicast`]
2229 - [`Ipv4Addr::is_broadcast`]
2230 - [`Ipv4Addr::is_documentation`]
2231 - [`Ipv4Addr::to_ipv6_compatible`]
2232 - [`Ipv4Addr::to_ipv6_mapped`]
2233 - [`Ipv6Addr::segments`]
2234 - [`Ipv6Addr::is_unspecified`]
2235 - [`Ipv6Addr::is_loopback`]
2236 - [`Ipv6Addr::is_multicast`]
2237 - [`Ipv6Addr::to_ipv4`]
2240 - [`Layout::from_size_align`]
2241 - `pow` for all integer types.
2242 - `checked_pow` for all integer types.
2243 - `saturating_pow` for all integer types.
2244 - `wrapping_pow` for all integer types.
2245 - `next_power_of_two` for all unsigned integer types.
2246 - `checked_next_power_of_two` for all unsigned integer types.
2249 -----------------------
2251 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2252 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2253 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2254 contents of that directory for changes.][cargo/8973]
2255 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2260 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2261 - [Running tests will now print the total time taken to execute.][75752]
2266 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2267 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2268 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2269 unhygenic `macro_rules!` macros.][79472]
2270 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2271 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2272 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2273 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2274 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2275 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2277 [74989]: https://github.com/rust-lang/rust/pull/74989
2278 [79261]: https://github.com/rust-lang/rust/pull/79261
2279 [79896]: https://github.com/rust-lang/rust/pull/79896
2280 [79484]: https://github.com/rust-lang/rust/pull/79484
2281 [79472]: https://github.com/rust-lang/rust/pull/79472
2282 [79270]: https://github.com/rust-lang/rust/pull/79270
2283 [79003]: https://github.com/rust-lang/rust/pull/79003
2284 [78864]: https://github.com/rust-lang/rust/pull/78864
2285 [78636]: https://github.com/rust-lang/rust/pull/78636
2286 [78439]: https://github.com/rust-lang/rust/pull/78439
2287 [78343]: https://github.com/rust-lang/rust/pull/78343
2288 [78296]: https://github.com/rust-lang/rust/pull/78296
2289 [78068]: https://github.com/rust-lang/rust/pull/78068
2290 [75752]: https://github.com/rust-lang/rust/pull/75752
2291 [74699]: https://github.com/rust-lang/rust/pull/74699
2292 [78142]: https://github.com/rust-lang/rust/pull/78142
2293 [77484]: https://github.com/rust-lang/rust/pull/77484
2294 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2295 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2296 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2297 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2298 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2299 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2300 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2301 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2302 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2303 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2304 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2305 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2306 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2307 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2308 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2309 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2310 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2311 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2312 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2313 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2314 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2315 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2316 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2317 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2318 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2319 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2320 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2321 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2322 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2323 [`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
2324 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2325 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2326 [`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
2327 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2330 Version 1.49.0 (2020-12-31)
2331 ============================
2334 -----------------------
2336 - [Unions can now implement `Drop`, and you can now have a field in a union
2337 with `ManuallyDrop<T>`.][77547]
2338 - [You can now cast uninhabited enums to integers.][76199]
2339 - [You can now bind by reference and by move in patterns.][76119] This
2340 allows you to selectively borrow individual components of a type. E.g.
2348 let person = Person {
2349 name: String::from("Alice"),
2353 // `name` is moved out of person, but `age` is referenced.
2354 let Person { name, ref age } = person;
2355 println!("{} {}", name, age);
2359 -----------------------
2361 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2362 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2363 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2364 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2365 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2366 - [Output from threads spawned in tests is now captured.][78227]
2367 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2369 \* Refer to Rust's [platform support page][platform-support-doc] for more
2370 information on Rust's tiered platform support.
2373 -----------------------
2375 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2376 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2381 - [`slice::select_nth_unstable`]
2382 - [`slice::select_nth_unstable_by`]
2383 - [`slice::select_nth_unstable_by_key`]
2385 The following previously stable methods are now `const`.
2387 - [`Poll::is_ready`]
2388 - [`Poll::is_pending`]
2391 -----------------------
2392 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2393 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2394 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2395 variable will be set if the crate being built is one the user selected to build, either
2396 with `-p` or through defaults.
2397 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2403 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2404 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2405 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2406 Previously such invalid or unused attributes could be ignored.
2407 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2408 read [this post about the changes][rustdoc-ws-post] for more details.
2409 - [Trait bounds are no longer inferred for associated types.][79904]
2413 These changes provide no direct user facing benefits, but represent significant
2414 improvements to the internals and overall performance of rustc and
2417 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2418 Local Storage model.][78201]
2419 - [Calculate visibilities once in resolve.][78077]
2420 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2421 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2424 [75991]: https://github.com/rust-lang/rust/pull/75991
2425 [78951]: https://github.com/rust-lang/rust/pull/78951
2426 [78848]: https://github.com/rust-lang/rust/pull/78848
2427 [78746]: https://github.com/rust-lang/rust/pull/78746
2428 [78376]: https://github.com/rust-lang/rust/pull/78376
2429 [78228]: https://github.com/rust-lang/rust/pull/78228
2430 [78227]: https://github.com/rust-lang/rust/pull/78227
2431 [78201]: https://github.com/rust-lang/rust/pull/78201
2432 [78109]: https://github.com/rust-lang/rust/pull/78109
2433 [78077]: https://github.com/rust-lang/rust/pull/78077
2434 [77997]: https://github.com/rust-lang/rust/pull/77997
2435 [77703]: https://github.com/rust-lang/rust/pull/77703
2436 [77547]: https://github.com/rust-lang/rust/pull/77547
2437 [77015]: https://github.com/rust-lang/rust/pull/77015
2438 [76199]: https://github.com/rust-lang/rust/pull/76199
2439 [76119]: https://github.com/rust-lang/rust/pull/76119
2440 [75914]: https://github.com/rust-lang/rust/pull/75914
2441 [79004]: https://github.com/rust-lang/rust/pull/79004
2442 [78676]: https://github.com/rust-lang/rust/pull/78676
2443 [79904]: https://github.com/rust-lang/rust/issues/79904
2444 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2445 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2446 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2447 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2448 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2449 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2450 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2451 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2452 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2453 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2455 Version 1.48.0 (2020-11-19)
2456 ==========================
2461 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2462 is still rejected *semantically*, but can now be parsed by procedural macros.
2466 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2467 `rustc` whether to link its own C runtime and libraries or to rely on a external
2468 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2469 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2470 Note: If you're using cargo you must explicitly pass the `--target` flag.
2471 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2473 \* Refer to Rust's [platform support page][platform-support-doc] for more
2474 information on Rust's tiered platform support.
2478 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2479 and `&Stderr`.][76275]
2480 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2481 - [The `matches!` macro now supports having a trailing comma.][74880]
2482 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2483 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2487 - [`slice::as_ptr_range`]
2488 - [`slice::as_mut_ptr_range`]
2489 - [`VecDeque::make_contiguous`]
2490 - [`future::pending`]
2493 The following previously stable methods are now `const fn`'s:
2495 - [`Option::is_some`]
2496 - [`Option::is_none`]
2497 - [`Option::as_ref`]
2499 - [`Result::is_err`]
2500 - [`Result::as_ref`]
2501 - [`Ordering::reverse`]
2502 - [`Ordering::then`]
2509 - [You can now link to items in `rustdoc` using the intra-doc link
2510 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2511 a link to `std::future`'s documentation. See ["Linking to items by
2512 name"][intradoc-links] for more information.
2513 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2514 when searching through `rustdoc`'s UI.][75740]
2518 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2519 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2520 promoted to `'static` lifetime any more inside `const fn`s.
2521 - [Associated type bindings on trait objects are now verified to meet the bounds
2522 declared on the trait when checking that they implement the trait.][27675]
2523 - [When trait bounds on associated types or opaque types are ambiguous, the
2524 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2525 - [Fixed recursive nonterminals not being expanded in macros during
2526 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2527 correctly handling recursive nonterminal tokens.
2528 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2529 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2530 in places where they have no effect.][73461]
2531 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2532 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2533 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2534 disallow zero-initialization.][71274]
2535 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2536 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2537 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2538 see the [`catch_unwind`] documentation for further information.
2544 These changes provide no direct user facing benefits, but represent significant
2545 improvements to the internals and overall performance of rustc and
2548 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2549 You can continue building with `make` by setting `ninja=false` in
2551 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2552 - [Made `ensure_sufficient_stack()` non-generic][76680]
2554 [78143]: https://github.com/rust-lang/rust/issues/78143
2555 [76680]: https://github.com/rust-lang/rust/pull/76680/
2556 [76030]: https://github.com/rust-lang/rust/pull/76030/
2557 [70212]: https://github.com/rust-lang/rust/pull/70212/
2558 [27675]: https://github.com/rust-lang/rust/issues/27675/
2559 [54121]: https://github.com/rust-lang/rust/issues/54121/
2560 [71274]: https://github.com/rust-lang/rust/pull/71274/
2561 [77386]: https://github.com/rust-lang/rust/pull/77386/
2562 [77153]: https://github.com/rust-lang/rust/pull/77153/
2563 [77055]: https://github.com/rust-lang/rust/pull/77055/
2564 [76275]: https://github.com/rust-lang/rust/pull/76275/
2565 [76310]: https://github.com/rust-lang/rust/pull/76310/
2566 [76420]: https://github.com/rust-lang/rust/pull/76420/
2567 [76158]: https://github.com/rust-lang/rust/pull/76158/
2568 [75857]: https://github.com/rust-lang/rust/pull/75857/
2569 [75585]: https://github.com/rust-lang/rust/pull/75585/
2570 [75740]: https://github.com/rust-lang/rust/pull/75740/
2571 [75502]: https://github.com/rust-lang/rust/pull/75502/
2572 [74880]: https://github.com/rust-lang/rust/pull/74880/
2573 [74922]: https://github.com/rust-lang/rust/pull/74922/
2574 [74430]: https://github.com/rust-lang/rust/pull/74430/
2575 [74194]: https://github.com/rust-lang/rust/pull/74194/
2576 [73461]: https://github.com/rust-lang/rust/pull/73461/
2577 [73166]: https://github.com/rust-lang/rust/pull/73166/
2578 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2579 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2580 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2581 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2582 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2583 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2584 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2585 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2586 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2587 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2588 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2589 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2590 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2591 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2592 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2595 Version 1.47.0 (2020-10-08)
2596 ==========================
2600 - [Closures will now warn when not used.][74869]
2604 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2605 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2607 - [Upgraded to LLVM 11.][73526]
2608 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2609 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2610 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2612 \* Refer to Rust's [platform support page][platform-support-doc] for more
2613 information on Rust's tiered platform support.
2617 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2618 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2619 those of length less than 33.][74060]
2620 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2621 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2622 `PartialEq`, and `PartialOrd`.][73583]
2626 - [`Ident::new_raw`]
2627 - [`Range::is_empty`]
2628 - [`RangeInclusive::is_empty`]
2629 - [`Result::as_deref`]
2630 - [`Result::as_deref_mut`]
2632 - [`pointer::offset_from`]
2636 The following previously stable APIs have now been made const.
2638 - [The `new` method for all `NonZero` integers.][73858]
2639 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2640 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2641 methods for all integers.][73858]
2642 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2643 signed integers.][73858]
2644 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2645 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2646 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2647 `is_ascii_control` methods for `char` and `u8`.][73858]
2651 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2652 You can override this by setting the following in your `Cargo.toml`.
2654 [profile.release.build-override]
2657 - [`cargo-help` will now display man pages for commands rather just the
2658 `--help` text.][cargo/8456]
2659 - [`cargo-metadata` now emits a `test` field indicating if a target has
2660 tests enabled.][cargo/8478]
2661 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2662 - [`cargo-publish` will now use an alternative registry by default if it's the
2663 only registry specified in `package.publish`.][cargo/8571]
2667 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2668 type based search.][75366]
2669 - [Added the Ayu theme to rustdoc.][71237]
2673 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2674 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2675 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2676 help to preserve more span information.][73084] These changes may cause
2677 compilation errors if your macro was unhygenic or didn't correctly handle
2679 - [Moved support for the CloudABI target to tier 3.][75568]
2680 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2681 - [Added the `rustc-docs` component.][75560] This allows you to install
2682 and read the documentation for the compiler internal APIs. (Currently only
2683 available for `x86_64-unknown-linux-gnu`.)
2688 - [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.
2690 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2691 [75048]: https://github.com/rust-lang/rust/pull/75048/
2692 [74163]: https://github.com/rust-lang/rust/pull/74163/
2693 [71237]: https://github.com/rust-lang/rust/pull/71237/
2694 [74869]: https://github.com/rust-lang/rust/pull/74869/
2695 [73858]: https://github.com/rust-lang/rust/pull/73858/
2696 [75716]: https://github.com/rust-lang/rust/pull/75716/
2697 [75560]: https://github.com/rust-lang/rust/pull/75560/
2698 [75568]: https://github.com/rust-lang/rust/pull/75568/
2699 [75366]: https://github.com/rust-lang/rust/pull/75366/
2700 [75204]: https://github.com/rust-lang/rust/pull/75204/
2701 [74650]: https://github.com/rust-lang/rust/pull/74650/
2702 [74419]: https://github.com/rust-lang/rust/pull/74419/
2703 [73964]: https://github.com/rust-lang/rust/pull/73964/
2704 [74021]: https://github.com/rust-lang/rust/pull/74021/
2705 [74060]: https://github.com/rust-lang/rust/pull/74060/
2706 [73893]: https://github.com/rust-lang/rust/pull/73893/
2707 [73526]: https://github.com/rust-lang/rust/pull/73526/
2708 [73583]: https://github.com/rust-lang/rust/pull/73583/
2709 [73084]: https://github.com/rust-lang/rust/pull/73084/
2710 [73197]: https://github.com/rust-lang/rust/pull/73197/
2711 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2712 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2713 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2714 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2715 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2716 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2717 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2718 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2719 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2720 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2721 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2722 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2723 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2724 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2727 Version 1.46.0 (2020-08-27)
2728 ==========================
2732 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2733 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2734 const functions.][73862]
2735 - [The `#[track_caller]` attribute can now be added to functions to use the
2736 function's caller's location information for panic messages.][72445]
2737 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2738 `x.0.0` over `(x.0).0`.
2739 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2740 You currently can't use `mem::transmute` in constant functions.
2744 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2745 - [Enabled static "Position Independent Executables" by default
2746 for `x86_64-unknown-linux-musl`.][70740]
2750 - [`mem::forget` is now a `const fn`.][73887]
2751 - [`String` now implements `From<char>`.][73466]
2752 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2753 integer types.][73032]
2754 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2755 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2756 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2757 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2758 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2759 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2764 - [`vec::Drain::as_slice`]
2768 Added a number of new environment variables that are now available when
2769 compiling your crate.
2771 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2772 the specific binary being compiled and the name of the crate.
2773 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2774 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2778 - [The target configuration option `abi_blacklist` has been renamed
2779 to `unsupported_abis`.][74150] The old name will still continue to work.
2780 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2781 This was previously accepted but will become a hard error in a future release.
2782 - [Rustc will fail to compile if you have a struct with
2783 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2785 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2786 ensure that spans have the correct information, and may cause breakage if you
2787 were relying on receiving spans with dummy information.
2788 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2789 a legacy installer that was replaced by a MSI installer a few years ago but
2790 was still being built.
2791 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2792 - [Rustc will no longer accept overlapping trait implementations that only
2793 differ in how the lifetime was bound.][72493]
2794 - [Rustc now correctly relates the lifetime of an existential associated
2795 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2796 you to pass a shorter lifetime than expected.
2797 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2798 The library will need to be installed for `rustc` to work, even though we
2799 expect it to be already available on most systems.
2800 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2802 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2803 exact output returned by rustc's pretty printing is an unstable
2804 implementation detail: we recommend any macro relying on it to switch to a
2805 more robust parsing system.
2807 [75453]: https://github.com/rust-lang/rust/issues/75453/
2808 [74820]: https://github.com/rust-lang/rust/issues/74820/
2809 [74420]: https://github.com/rust-lang/rust/issues/74420/
2810 [74109]: https://github.com/rust-lang/rust/pull/74109/
2811 [74150]: https://github.com/rust-lang/rust/pull/74150/
2812 [73862]: https://github.com/rust-lang/rust/pull/73862/
2813 [73887]: https://github.com/rust-lang/rust/pull/73887/
2814 [73466]: https://github.com/rust-lang/rust/pull/73466/
2815 [73516]: https://github.com/rust-lang/rust/pull/73516/
2816 [73293]: https://github.com/rust-lang/rust/pull/73293/
2817 [73007]: https://github.com/rust-lang/rust/pull/73007/
2818 [73032]: https://github.com/rust-lang/rust/pull/73032/
2819 [72920]: https://github.com/rust-lang/rust/pull/72920/
2820 [72569]: https://github.com/rust-lang/rust/pull/72569/
2821 [72583]: https://github.com/rust-lang/rust/pull/72583/
2822 [72584]: https://github.com/rust-lang/rust/pull/72584/
2823 [72717]: https://github.com/rust-lang/rust/pull/72717/
2824 [72437]: https://github.com/rust-lang/rust/pull/72437/
2825 [72445]: https://github.com/rust-lang/rust/pull/72445/
2826 [72486]: https://github.com/rust-lang/rust/pull/72486/
2827 [72493]: https://github.com/rust-lang/rust/pull/72493/
2828 [72331]: https://github.com/rust-lang/rust/pull/72331/
2829 [71896]: https://github.com/rust-lang/rust/pull/71896/
2830 [71660]: https://github.com/rust-lang/rust/pull/71660/
2831 [71322]: https://github.com/rust-lang/rust/pull/71322/
2832 [70740]: https://github.com/rust-lang/rust/pull/70740/
2833 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2834 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2835 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2836 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2837 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2840 Version 1.45.2 (2020-08-03)
2841 ==========================
2843 * [Fix bindings in tuple struct patterns][74954]
2844 * [Fix track_caller integration with trait objects][74784]
2846 [74954]: https://github.com/rust-lang/rust/issues/74954
2847 [74784]: https://github.com/rust-lang/rust/issues/74784
2850 Version 1.45.1 (2020-07-30)
2851 ==========================
2853 * [Fix const propagation with references.][73613]
2854 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2855 * [Avoid spurious implicit region bound.][74509]
2856 * [Install clippy on x.py install][74457]
2858 [73613]: https://github.com/rust-lang/rust/pull/73613
2859 [73078]: https://github.com/rust-lang/rust/issues/73078
2860 [74509]: https://github.com/rust-lang/rust/pull/74509
2861 [74457]: https://github.com/rust-lang/rust/pull/74457
2864 Version 1.45.0 (2020-07-16)
2865 ==========================
2869 - [Out of range float to int conversions using `as` has been defined as a saturating
2870 conversion.][71269] This was previously undefined behaviour, but you can use the
2871 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2872 may be desirable in rare performance sensitive situations.
2873 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2874 using `u64`.][70705]
2875 - [Function like procedural macros can now be used in expression, pattern, and statement
2876 positions.][68717] This means you can now use a function-like procedural macro
2877 anywhere you can use a declarative (`macro_rules!`) macro.
2881 - [You can now override individual target features through the `target-feature`
2882 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2883 equivalent to `-C target-feature=+avx2,+fma`.
2884 - [Added the `force-unwind-tables` flag.][69984] This option allows
2885 rustc to always generate unwind tables regardless of panic strategy.
2886 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2887 to include LLVM bitcode into generated `rlib`s (this is on by default).
2888 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2889 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2890 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2891 - [Upgraded to LLVM 10.][67759]
2893 \* Refer to Rust's [platform support page][platform-support-doc] for more
2894 information on Rust's tiered platform support.
2899 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2901 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2902 - [You can now use `char` with
2903 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2904 a range of codepoints.][72413] E.g.
2905 you can now write the following;
2907 for ch in 'a'..='z' {
2911 // Prints "abcdefghijklmnopqrstuvwxyz"
2913 - [`OsString` now implements `FromStr`.][71662]
2914 - [The `saturating_neg` method has been added to all signed integer primitive
2915 types, and the `saturating_abs` method has been added for all integer
2916 primitive types.][71886]
2917 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2918 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2920 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2921 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2922 integer types.][69813]
2923 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2924 integer types.][72324]
2925 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2930 - [`BTreeMap::remove_entry`]
2932 - [`rc::Weak::as_ptr`]
2933 - [`rc::Weak::from_raw`]
2934 - [`rc::Weak::into_raw`]
2935 - [`str::strip_prefix`]
2936 - [`str::strip_suffix`]
2937 - [`sync::Weak::as_ptr`]
2938 - [`sync::Weak::from_raw`]
2939 - [`sync::Weak::into_raw`]
2940 - [`char::UNICODE_VERSION`]
2941 - [`Span::resolved_at`]
2942 - [`Span::located_at`]
2943 - [`Span::mixed_site`]
2944 - [`unix::process::CommandExt::arg0`]
2949 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2954 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2955 `~~outdated information~~` becomes "~~outdated information~~".
2956 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2960 - [Trying to self initialize a static value (that is creating a value using
2961 itself) is unsound and now causes a compile error.][71140]
2962 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2963 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2964 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2965 previously undocumented and not intended for public use. Rustdoc still provides
2966 a non-zero exit code on errors.
2967 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2968 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2969 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2970 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2971 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2975 - [Make clippy a git subtree instead of a git submodule][70655]
2976 - [Unify the undo log of all snapshot types][69464]
2978 [71848]: https://github.com/rust-lang/rust/issues/71848/
2979 [73420]: https://github.com/rust-lang/rust/issues/73420/
2980 [72324]: https://github.com/rust-lang/rust/pull/72324/
2981 [71843]: https://github.com/rust-lang/rust/pull/71843/
2982 [71886]: https://github.com/rust-lang/rust/pull/71886/
2983 [72234]: https://github.com/rust-lang/rust/pull/72234/
2984 [72239]: https://github.com/rust-lang/rust/pull/72239/
2985 [72397]: https://github.com/rust-lang/rust/pull/72397/
2986 [72413]: https://github.com/rust-lang/rust/pull/72413/
2987 [72014]: https://github.com/rust-lang/rust/pull/72014/
2988 [72062]: https://github.com/rust-lang/rust/pull/72062/
2989 [72094]: https://github.com/rust-lang/rust/pull/72094/
2990 [72133]: https://github.com/rust-lang/rust/pull/72133/
2991 [67759]: https://github.com/rust-lang/rust/pull/67759/
2992 [71900]: https://github.com/rust-lang/rust/pull/71900/
2993 [71928]: https://github.com/rust-lang/rust/pull/71928/
2994 [71662]: https://github.com/rust-lang/rust/pull/71662/
2995 [71716]: https://github.com/rust-lang/rust/pull/71716/
2996 [71447]: https://github.com/rust-lang/rust/pull/71447/
2997 [71269]: https://github.com/rust-lang/rust/pull/71269/
2998 [71095]: https://github.com/rust-lang/rust/pull/71095/
2999 [71140]: https://github.com/rust-lang/rust/pull/71140/
3000 [70655]: https://github.com/rust-lang/rust/pull/70655/
3001 [70705]: https://github.com/rust-lang/rust/pull/70705/
3002 [69984]: https://github.com/rust-lang/rust/pull/69984/
3003 [69813]: https://github.com/rust-lang/rust/pull/69813/
3004 [69464]: https://github.com/rust-lang/rust/pull/69464/
3005 [68717]: https://github.com/rust-lang/rust/pull/68717/
3006 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
3007 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
3008 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
3009 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
3010 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3011 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3012 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3013 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3014 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3015 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3016 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3017 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3018 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3019 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3020 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3021 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3022 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3025 Version 1.44.1 (2020-06-18)
3026 ===========================
3028 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3029 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3030 * [Fix crashes when finding backtrace on macOS.][71397]
3031 * [Clippy applies lint levels into different files.][clippy/5356]
3033 [71397]: https://github.com/rust-lang/rust/issues/71397
3034 [73078]: https://github.com/rust-lang/rust/issues/73078
3035 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3036 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3039 Version 1.44.0 (2020-06-04)
3040 ==========================
3044 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3045 - [Added the `unused_braces` lint.][70081]
3047 **Syntax-only changes**
3049 - [Expansion-driven outline module parsing][69838]
3054 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3059 These are still rejected semantically, so you will likely receive an error but
3060 these changes can be seen and parsed by macros and conditional compilation.
3064 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3065 Additionally when in incremental mode rustc defaults to 256 codegen units.
3066 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3067 a panic is thrown.][67502]
3068 - [Added tier 3\* support for the `aarch64-unknown-none` and
3069 `aarch64-unknown-none-softfloat` targets.][68334]
3070 - [Added tier 3 support for `arm64-apple-tvos` and
3071 `x86_64-apple-tvos` targets.][68191]
3076 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3077 `vec![]` to be able to be used in `const` contexts.
3078 - [`convert::Infallible` now implements `Hash`.][70281]
3079 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3080 a `&mut OsStr`.][70048]
3081 - [Unicode 13 is now supported.][69929]
3082 - [`String` now implements `From<&mut str>`.][69661]
3083 - [`IoSlice` now implements `Copy`.][69403]
3084 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3085 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3086 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3087 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3088 integer types.][69373]
3092 - [`PathBuf::with_capacity`]
3093 - [`PathBuf::capacity`]
3094 - [`PathBuf::clear`]
3095 - [`PathBuf::reserve`]
3096 - [`PathBuf::reserve_exact`]
3097 - [`PathBuf::shrink_to_fit`]
3098 - [`f32::to_int_unchecked`]
3099 - [`f64::to_int_unchecked`]
3100 - [`Layout::align_to`]
3101 - [`Layout::pad_to_align`]
3103 - [`Layout::extend`]
3107 - [Added the `cargo tree` command which will print a tree graph of
3108 your dependencies.][cargo/8062] E.g.
3110 mdbook v0.3.2 (/Users/src/rust/mdbook)
3112 │ ├── html5ever v0.24.0
3114 │ │ │ └── cfg-if v0.1.9
3116 │ │ └── markup5ever v0.9.0
3117 │ │ ├── log v0.4.8 (*)
3119 │ │ │ └── phf_shared v0.7.24
3120 │ │ │ ├── siphasher v0.2.3
3121 │ │ │ └── unicase v1.4.2
3122 │ │ │ [build-dependencies]
3123 │ │ │ └── version_check v0.1.5
3126 You can also display dependencies on multiple versions of the same crate with
3127 `cargo tree -d` (short for `cargo tree --duplicates`).
3131 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3132 the version in the sidebar.][69494]
3136 - [Rustc now correctly generates static libraries on Windows GNU targets with
3137 the `.a` extension, rather than the previous `.lib`.][70937]
3138 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3139 - [The `file_name` property in JSON output of macro errors now points the actual
3140 source file rather than the previous format of `<NAME macros>`.][70969]
3141 **Note:** this may not point to a file that actually exists on the user's system.
3142 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3143 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3144 not allow zero initialization such as `NonZeroU8`.][66059] This was
3145 previously a warning.
3146 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3147 operator has been defined as a saturating operation.][71269] This was previously
3148 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3149 continue using the current behaviour, which may be desirable in rare performance
3150 sensitive situations.
3154 These changes provide no direct user facing benefits, but represent significant
3155 improvements to the internals and overall performance of rustc and
3158 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3159 - [Replace big JS dict with JSON parsing.][71250]
3161 [69373]: https://github.com/rust-lang/rust/pull/69373/
3162 [66059]: https://github.com/rust-lang/rust/pull/66059/
3163 [68191]: https://github.com/rust-lang/rust/pull/68191/
3164 [68899]: https://github.com/rust-lang/rust/pull/68899/
3165 [71147]: https://github.com/rust-lang/rust/pull/71147/
3166 [71250]: https://github.com/rust-lang/rust/pull/71250/
3167 [70937]: https://github.com/rust-lang/rust/pull/70937/
3168 [70969]: https://github.com/rust-lang/rust/pull/70969/
3169 [70632]: https://github.com/rust-lang/rust/pull/70632/
3170 [70281]: https://github.com/rust-lang/rust/pull/70281/
3171 [70345]: https://github.com/rust-lang/rust/pull/70345/
3172 [70048]: https://github.com/rust-lang/rust/pull/70048/
3173 [70081]: https://github.com/rust-lang/rust/pull/70081/
3174 [70156]: https://github.com/rust-lang/rust/pull/70156/
3175 [71269]: https://github.com/rust-lang/rust/pull/71269/
3176 [69838]: https://github.com/rust-lang/rust/pull/69838/
3177 [69929]: https://github.com/rust-lang/rust/pull/69929/
3178 [69661]: https://github.com/rust-lang/rust/pull/69661/
3179 [69778]: https://github.com/rust-lang/rust/pull/69778/
3180 [69494]: https://github.com/rust-lang/rust/pull/69494/
3181 [69403]: https://github.com/rust-lang/rust/pull/69403/
3182 [69033]: https://github.com/rust-lang/rust/pull/69033/
3183 [68692]: https://github.com/rust-lang/rust/pull/68692/
3184 [68334]: https://github.com/rust-lang/rust/pull/68334/
3185 [67502]: https://github.com/rust-lang/rust/pull/67502/
3186 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3187 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3188 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3189 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3190 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3191 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3192 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3193 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3194 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3195 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3196 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3197 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3198 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3201 Version 1.43.1 (2020-05-07)
3202 ===========================
3204 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3205 * [Fixed the stabilization of AVX-512 features.][71473]
3206 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3208 [71430]: https://github.com/rust-lang/rust/pull/71430
3209 [71473]: https://github.com/rust-lang/rust/issues/71473
3210 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3213 Version 1.43.0 (2020-04-23)
3214 ==========================
3218 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3219 the type inferred correctly.][68129]
3220 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3222 **Syntax only changes**
3223 - [Allow `type Foo: Ord` syntactically.][69361]
3224 - [Fuse associated and extern items up to defaultness.][69194]
3225 - [Syntactically allow `self` in all `fn` contexts.][68764]
3226 - [Merge `fn` syntax + cleanup item parsing.][68728]
3227 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3228 For example, you may now write:
3230 macro_rules! mac_trait {
3240 These are still rejected *semantically*, so you will likely receive an error but
3241 these changes can be seen and parsed by macros and
3242 conditional compilation.
3247 - [You can now pass multiple lint flags to rustc to override the previous
3248 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3249 everything in the `unused` lint group except `unused-variables` which
3250 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3251 everything in the `unused` lint group **including** `unused-variables` since
3252 the allow flag is specified before the deny flag (and therefore overridden).
3253 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3254 if they are available on `windows-gnu`.][67429]
3255 - [rustc now buffers errors/warnings printed in JSON.][69227]
3259 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3260 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3261 respectively.][69538] **Note** These conversions are only available when `N`
3263 - [You can now use associated constants on floats and integers directly, rather
3264 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3265 `f32::NAN` with no imports.
3266 - [`u8::is_ascii` is now `const`.][68984]
3267 - [`String` now implements `AsMut<str>`.][68742]
3268 - [Added the `primitive` module to `std` and `core`.][67637] This module
3269 reexports Rust's primitive types. This is mainly useful in macros
3270 where you want avoid these types being shadowed.
3271 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3272 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3276 - [`Once::is_completed`]
3281 - [`iter::once_with`]
3285 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3286 your environment.][cargo/7823]
3287 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3288 executable path when running integration tests or benchmarks.][cargo/7697]
3289 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3290 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3294 - [Certain checks in the `const_err` lint were deemed unrelated to const
3295 evaluation][69185], and have been moved to the `unconditional_panic` and
3296 `arithmetic_overflow` lints.
3301 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3302 has been a warning since 1.36.0.
3303 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3304 led to some instances being accepted, and now correctly emits a hard error.
3306 [69340]: https://github.com/rust-lang/rust/pull/69340
3310 These changes provide no direct user facing benefits, but represent significant
3311 improvements to the internals and overall performance of `rustc` and
3314 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3315 - [Improved how rustc generates drop code.][67332]
3316 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3317 - [traits: preallocate 2 Vecs of known initial size][69022]
3318 - [Avoid exponential behaviour when relating types][68772]
3319 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3320 - [Improve performance of coherence checks][68966]
3321 - [Deduplicate types in the generator witness][68672]
3322 - [Invert control in struct_lint_level.][68725]
3324 [67332]: https://github.com/rust-lang/rust/pull/67332/
3325 [67429]: https://github.com/rust-lang/rust/pull/67429/
3326 [67637]: https://github.com/rust-lang/rust/pull/67637/
3327 [67642]: https://github.com/rust-lang/rust/pull/67642/
3328 [67878]: https://github.com/rust-lang/rust/pull/67878/
3329 [67885]: https://github.com/rust-lang/rust/pull/67885/
3330 [68129]: https://github.com/rust-lang/rust/pull/68129/
3331 [68672]: https://github.com/rust-lang/rust/pull/68672/
3332 [68725]: https://github.com/rust-lang/rust/pull/68725/
3333 [68728]: https://github.com/rust-lang/rust/pull/68728/
3334 [68738]: https://github.com/rust-lang/rust/pull/68738/
3335 [68742]: https://github.com/rust-lang/rust/pull/68742/
3336 [68764]: https://github.com/rust-lang/rust/pull/68764/
3337 [68772]: https://github.com/rust-lang/rust/pull/68772/
3338 [68943]: https://github.com/rust-lang/rust/pull/68943/
3339 [68952]: https://github.com/rust-lang/rust/pull/68952/
3340 [68966]: https://github.com/rust-lang/rust/pull/68966/
3341 [68984]: https://github.com/rust-lang/rust/pull/68984/
3342 [69022]: https://github.com/rust-lang/rust/pull/69022/
3343 [69185]: https://github.com/rust-lang/rust/pull/69185/
3344 [69194]: https://github.com/rust-lang/rust/pull/69194/
3345 [69201]: https://github.com/rust-lang/rust/pull/69201/
3346 [69227]: https://github.com/rust-lang/rust/pull/69227/
3347 [69548]: https://github.com/rust-lang/rust/pull/69548/
3348 [69256]: https://github.com/rust-lang/rust/pull/69256/
3349 [69361]: https://github.com/rust-lang/rust/pull/69361/
3350 [69366]: https://github.com/rust-lang/rust/pull/69366/
3351 [69538]: https://github.com/rust-lang/rust/pull/69538/
3352 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3353 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3354 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3355 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3356 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3357 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3358 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3359 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3362 Version 1.42.0 (2020-03-12)
3363 ==========================
3367 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3369 fn foo(words: &[&str]) {
3371 ["Hello", "World", "!", ..] => println!("Hello World!"),
3372 ["Foo", "Bar", ..] => println!("Baz"),
3373 rest => println!("{:?}", rest),
3377 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3378 that you can create an enum that has the exact layout and ABI of the type
3380 - [You can now use outer attribute procedural macros on inline modules.][64273]
3381 - [There are some *syntax-only* changes:][67131]
3382 - `default` is syntactically allowed before items in `trait` definitions.
3383 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3384 leave out their bodies in favor of `;`.
3385 - Bounds on associated types in `impl`s are now syntactically allowed
3386 (e.g. `type Foo: Ord;`).
3387 - `...` (the C-variadic type) may occur syntactically directly as the type of
3388 any function parameter.
3390 These are still rejected *semantically*, so you will likely receive an error
3391 but these changes can be seen and parsed by procedural macros and
3392 conditional compilation.
3396 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3397 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3398 - [`Option::{expect,unwrap}` and
3399 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3400 pointing to the location where they were called, rather than
3401 `core`'s internals. ][67887]
3403 \* Refer to Rust's [platform support page][platform-support-doc] for more
3404 information on Rust's tiered platform support.
3408 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3409 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3410 to implement `Sized`.][67935]
3411 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3412 - [`Layout::new` is now `const`.][66254]
3413 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3418 - [`CondVar::wait_while`]
3419 - [`CondVar::wait_timeout_while`]
3421 - [`DebugMap::value`]
3422 - [`ManuallyDrop::take`]
3424 - [`ptr::slice_from_raw_parts_mut`]
3425 - [`ptr::slice_from_raw_parts`]
3429 - [You no longer need to include `extern crate proc_macro;` to be able to
3430 `use proc_macro;` in the `2018` edition.][cargo/7700]
3434 - [`Error::description` has been deprecated, and its use will now produce a
3435 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3437 [68253]: https://github.com/rust-lang/rust/pull/68253/
3438 [68348]: https://github.com/rust-lang/rust/pull/68348/
3439 [67935]: https://github.com/rust-lang/rust/pull/67935/
3440 [68339]: https://github.com/rust-lang/rust/pull/68339/
3441 [68122]: https://github.com/rust-lang/rust/pull/68122/
3442 [64273]: https://github.com/rust-lang/rust/pull/64273/
3443 [67712]: https://github.com/rust-lang/rust/pull/67712/
3444 [67887]: https://github.com/rust-lang/rust/pull/67887/
3445 [67131]: https://github.com/rust-lang/rust/pull/67131/
3446 [67233]: https://github.com/rust-lang/rust/pull/67233/
3447 [66899]: https://github.com/rust-lang/rust/pull/66899/
3448 [66919]: https://github.com/rust-lang/rust/pull/66919/
3449 [66254]: https://github.com/rust-lang/rust/pull/66254/
3450 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3451 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3452 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3453 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3454 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3455 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3456 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3457 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3458 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3461 Version 1.41.1 (2020-02-27)
3462 ===========================
3464 * [Always check types of static items][69145]
3465 * [Always check lifetime bounds of `Copy` impls][69145]
3466 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3468 [69225]: https://github.com/rust-lang/rust/issues/69225
3469 [69145]: https://github.com/rust-lang/rust/pull/69145
3472 Version 1.41.0 (2020-01-30)
3473 ===========================
3478 - [You can now pass type parameters to foreign items when implementing
3479 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3480 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3481 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3482 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3483 - [You can now use any valid identifier in a `format_args` macro.][66847]
3484 Previously identifiers starting with an underscore were not allowed.
3485 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3486 enum variants.][66183] These are still rejected semantically, but
3487 can be seen and parsed by procedural macros and conditional compilation.
3488 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3489 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3490 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3492 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3497 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3498 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3499 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3500 - [You can now pass an arguments file passing the `@path` syntax
3501 to rustc.][66172] Note that the format differs somewhat from what is
3502 found in other tooling; please see [the documentation][argfile-docs] for
3504 - [You can now provide `--extern` flag without a path, indicating that it is
3505 available from the search path or specified with an `-L` flag.][64882]
3507 \* Refer to Rust's [platform support page][platform-support-doc] for more
3508 information on Rust's tiered platform support.
3510 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3515 - [The `core::panic` module is now stable.][66771] It was already stable
3517 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3518 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3519 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3524 - [`Result::map_or`]
3525 - [`Result::map_or_else`]
3526 - [`std::rc::Weak::weak_count`]
3527 - [`std::rc::Weak::strong_count`]
3528 - [`std::sync::Weak::weak_count`]
3529 - [`std::sync::Weak::strong_count`]
3534 - [Cargo will now document all the private items for binary crates
3535 by default.][cargo/7593]
3536 - [`cargo-install` will now reinstall the package if it detects that it is out
3537 of date.][cargo/7560]
3538 - [Cargo.lock now uses a more git friendly format that should help to reduce
3539 merge conflicts.][cargo/7579]
3540 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3541 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3542 optimisation level to `2` for debug builds. You can also use
3543 `[profile.<profile>.build-override]` to override build scripts and
3549 - [You can now specify `edition` in documentation code blocks to compile the block
3550 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3551 should be compiled the 2018 edition of Rust.
3552 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3553 current theme with `--check-theme`.][54733]
3554 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3559 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3560 Apple targets.][apple-32bit-drop] This means that the source code is still
3561 available to build, but the targets are no longer being tested and release
3562 binaries for those platforms will no longer be distributed by the Rust project.
3563 Please refer to the linked blog post for more information.
3565 [54733]: https://github.com/rust-lang/rust/pull/54733/
3566 [61351]: https://github.com/rust-lang/rust/pull/61351/
3567 [62514]: https://github.com/rust-lang/rust/pull/62514/
3568 [67255]: https://github.com/rust-lang/rust/pull/67255/
3569 [66661]: https://github.com/rust-lang/rust/pull/66661/
3570 [66771]: https://github.com/rust-lang/rust/pull/66771/
3571 [66847]: https://github.com/rust-lang/rust/pull/66847/
3572 [66238]: https://github.com/rust-lang/rust/pull/66238/
3573 [66277]: https://github.com/rust-lang/rust/pull/66277/
3574 [66325]: https://github.com/rust-lang/rust/pull/66325/
3575 [66172]: https://github.com/rust-lang/rust/pull/66172/
3576 [66183]: https://github.com/rust-lang/rust/pull/66183/
3577 [65879]: https://github.com/rust-lang/rust/pull/65879/
3578 [65013]: https://github.com/rust-lang/rust/pull/65013/
3579 [64882]: https://github.com/rust-lang/rust/pull/64882/
3580 [64325]: https://github.com/rust-lang/rust/pull/64325/
3581 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3582 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3583 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3584 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3585 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3586 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3587 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3588 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3589 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3590 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3591 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3593 Version 1.40.0 (2019-12-19)
3594 ===========================
3598 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3599 `const` contexts.][65188] e.g.
3602 pub struct Point(i32, i32);
3604 const ORIGIN: Point = {
3605 let constructor = Point;
3611 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3612 indicate that there may be variants or fields added in the future.][64639]
3613 For example this requires adding a wild-card branch (`_ => {}`) to any match
3614 statements on a non-exhaustive `enum`. [(RFC 2008)]
3615 - [You can now use function-like procedural macros in `extern` blocks and in
3616 type positions.][63931] e.g. `type Generated = macro!();`
3617 - [Function-like and attribute procedural macros can now emit
3618 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3619 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3620 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3621 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3625 - [Added tier 3 support\* for the
3626 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3627 - [Added tier 3 support for the
3628 `aarch64-unknown-none-softfloat` target.][64589]
3629 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3630 `mips64el-unknown-linux-muslabi64` targets.][65843]
3632 \* Refer to Rust's [platform support page][platform-support-doc] for more
3633 information on Rust's tiered platform support.
3637 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3641 - [`BTreeMap::get_key_value`]
3642 - [`HashMap::get_key_value`]
3643 - [`Option::as_deref_mut`]
3644 - [`Option::as_deref`]
3645 - [`Option::flatten`]
3646 - [`UdpSocket::peer_addr`]
3647 - [`f32::to_be_bytes`]
3648 - [`f32::to_le_bytes`]
3649 - [`f32::to_ne_bytes`]
3650 - [`f64::to_be_bytes`]
3651 - [`f64::to_le_bytes`]
3652 - [`f64::to_ne_bytes`]
3653 - [`f32::from_be_bytes`]
3654 - [`f32::from_le_bytes`]
3655 - [`f32::from_ne_bytes`]
3656 - [`f64::from_be_bytes`]
3657 - [`f64::from_le_bytes`]
3658 - [`f64::from_ne_bytes`]
3665 - [Cargo will now always display warnings, rather than only on
3666 fresh builds.][cargo/7450]
3667 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3668 now produce an error.][cargo/7507] Previously these flags were ignored.
3669 - [You can now publish `dev-dependencies` without including
3670 a `version`.][cargo/7333]
3674 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3675 when running documentation tests with `rustdoc`.][63803]
3679 - [As previously announced, any previous NLL warnings in the 2015 edition are
3680 now hard errors.][64221]
3681 - [The `include!` macro will now warn if it failed to include the
3682 entire file.][64284] The `include!` macro unintentionally only includes the
3683 first _expression_ in a file, and this can be unintuitive. This will become
3684 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3685 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3686 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3687 or `extern` blocks now correctly emits a hard error.
3689 [65294]: https://github.com/rust-lang/rust/pull/65294/
3690 [66103]: https://github.com/rust-lang/rust/pull/66103/
3691 [65843]: https://github.com/rust-lang/rust/pull/65843/
3692 [65188]: https://github.com/rust-lang/rust/pull/65188/
3693 [65092]: https://github.com/rust-lang/rust/pull/65092/
3694 [64589]: https://github.com/rust-lang/rust/pull/64589/
3695 [64639]: https://github.com/rust-lang/rust/pull/64639/
3696 [64221]: https://github.com/rust-lang/rust/pull/64221/
3697 [64284]: https://github.com/rust-lang/rust/pull/64284/
3698 [63931]: https://github.com/rust-lang/rust/pull/63931/
3699 [64035]: https://github.com/rust-lang/rust/pull/64035/
3700 [63674]: https://github.com/rust-lang/rust/pull/63674/
3701 [63803]: https://github.com/rust-lang/rust/pull/63803/
3702 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3703 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3704 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3705 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3706 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3707 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3708 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3709 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3710 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3711 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3712 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3713 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3714 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3715 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3716 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3717 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3718 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3719 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3720 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3721 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3722 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3723 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3724 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3725 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3726 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3729 Version 1.39.0 (2019-11-07)
3730 ===========================
3734 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3735 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3736 - [You can now use certain attributes on function, closure, and function pointer
3737 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3738 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3739 attributes applied to items. e.g.
3742 #[cfg(windows)] slice: &[u16],
3743 #[cfg(not(windows))] slice: &[u8],
3748 - [You can now take shared references to bind-by-move patterns in the `if` guards
3749 of `match` arms.][63118] e.g.
3752 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3756 // ---- `nums` is bound by move.
3757 if nums.iter().sum::<u8>() == 10
3758 // ^------ `.iter()` implicitly takes a reference to `nums`.
3761 // ----------- Legal as `nums` was bound by move and so we have ownership.
3763 _ => unreachable!(),
3772 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3773 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3774 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3775 **Note** Cargo currently doesn't use this feature. Refer to
3776 [cargo#7315][cargo/7315] to track this feature's progress.
3777 - [You can now pass `--show-output` argument to test binaries to print the
3778 output of successful tests.][62600]
3781 \* Refer to Rust's [platform support page][platform-support-doc] for more
3782 information on Rust's tiered platform support.
3786 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3787 - [`LinkedList::new` is now a `const` function.][63684]
3788 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3789 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3790 now `const`.][63786]
3794 - [`Pin::into_inner`]
3795 - [`Instant::checked_duration_since`]
3796 - [`Instant::saturating_duration_since`]
3800 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3801 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3802 `--all` is now deprecated.
3806 - [You can now pass `-Clinker` to rustdoc to control the linker used
3807 for compiling doctests.][63834]
3811 - [Code that was previously accepted by the old borrow checker, but rejected by
3812 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3813 previously a warning, and will also become a hard error in the Rust 2015
3814 edition in the 1.40.0 release.
3815 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3816 run tests.][63827] This should improve performance when running a large
3818 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3819 recommended to use the `?` operator instead.
3820 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3823 [62600]: https://github.com/rust-lang/rust/pull/62600/
3824 [62672]: https://github.com/rust-lang/rust/pull/62672/
3825 [63118]: https://github.com/rust-lang/rust/pull/63118/
3826 [63209]: https://github.com/rust-lang/rust/pull/63209/
3827 [63402]: https://github.com/rust-lang/rust/pull/63402/
3828 [63565]: https://github.com/rust-lang/rust/pull/63565/
3829 [63595]: https://github.com/rust-lang/rust/pull/63595/
3830 [63684]: https://github.com/rust-lang/rust/pull/63684/
3831 [63698]: https://github.com/rust-lang/rust/pull/63698/
3832 [63770]: https://github.com/rust-lang/rust/pull/63770/
3833 [63786]: https://github.com/rust-lang/rust/pull/63786/
3834 [63827]: https://github.com/rust-lang/rust/pull/63827/
3835 [63834]: https://github.com/rust-lang/rust/pull/63834/
3836 [64010]: https://github.com/rust-lang/rust/pull/64010/
3837 [64028]: https://github.com/rust-lang/rust/pull/64028/
3838 [64334]: https://github.com/rust-lang/rust/pull/64334/
3839 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3840 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3841 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3842 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3843 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3844 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3846 Version 1.38.0 (2019-09-26)
3847 ==========================
3851 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3852 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3856 - [Added pipelined compilation support to `rustc`.][62766] This will
3857 improve compilation times in some cases. For further information please refer
3858 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3859 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3860 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3861 `x86_64-uwp-windows-msvc` targets.][60260]
3862 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3863 `armv7-unknown-linux-musleabi` targets.][63107]
3864 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3865 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3866 - [Upgraded to LLVM 9.][62592]
3868 \* Refer to Rust's [platform support page][platform-support-doc] for more
3869 information on Rust's tiered platform support.
3873 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3874 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3875 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3876 is available at `std::clone::Clone`). This also makes all built-in macros
3877 available in `std`/`core` root. e.g. `std::include_bytes!`.
3878 - [`str::Chars` now implements `Debug`.][63000]
3879 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3880 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3881 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3882 - [Added euclidean remainder and division operations (`div_euclid`,
3883 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3884 `overflowing`, and `wrapping` versions are available for all
3886 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3887 `PartialEq`.][61491]
3888 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3892 - [`<*const T>::cast`]
3893 - [`<*mut T>::cast`]
3894 - [`Duration::as_secs_f32`]
3895 - [`Duration::as_secs_f64`]
3896 - [`Duration::div_f32`]
3897 - [`Duration::div_f64`]
3898 - [`Duration::from_secs_f32`]
3899 - [`Duration::from_secs_f64`]
3900 - [`Duration::mul_f32`]
3901 - [`Duration::mul_f64`]
3902 - [`any::type_name`]
3906 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3907 - [You can now pass the `--features` option multiple times to enable
3908 multiple features.][cargo/7084]
3913 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3917 - [`rustc` will now warn about some incorrect uses of
3918 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3922 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3924 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3925 issues][62896] with certain crates such as libc.
3927 [60260]: https://github.com/rust-lang/rust/pull/60260/
3928 [61457]: https://github.com/rust-lang/rust/pull/61457/
3929 [61491]: https://github.com/rust-lang/rust/pull/61491/
3930 [61884]: https://github.com/rust-lang/rust/pull/61884/
3931 [61953]: https://github.com/rust-lang/rust/pull/61953/
3932 [62042]: https://github.com/rust-lang/rust/pull/62042/
3933 [62528]: https://github.com/rust-lang/rust/pull/62528/
3934 [62583]: https://github.com/rust-lang/rust/pull/62583/
3935 [62735]: https://github.com/rust-lang/rust/pull/62735/
3936 [62766]: https://github.com/rust-lang/rust/pull/62766/
3937 [62784]: https://github.com/rust-lang/rust/pull/62784/
3938 [62592]: https://github.com/rust-lang/rust/pull/62592/
3939 [62785]: https://github.com/rust-lang/rust/issues/62785/
3940 [62814]: https://github.com/rust-lang/rust/pull/62814/
3941 [62896]: https://github.com/rust-lang/rust/issues/62896/
3942 [63000]: https://github.com/rust-lang/rust/pull/63000/
3943 [63056]: https://github.com/rust-lang/rust/pull/63056/
3944 [63107]: https://github.com/rust-lang/rust/pull/63107/
3945 [63346]: https://github.com/rust-lang/rust/pull/63346/
3946 [63421]: https://github.com/rust-lang/rust/pull/63421/
3947 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3948 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3949 [63048]: https://github.com/rust-lang/rust/pull/63048
3950 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3951 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3952 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3953 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3954 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3955 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3956 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3957 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3958 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3959 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3960 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3961 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3962 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3964 Version 1.37.0 (2019-08-15)
3965 ==========================
3969 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3970 [`Box`][62228], or an [array][62235] and unused.
3971 - [You can now use the `cfg` and `cfg_attr` attributes on
3972 generic parameters.][61547]
3973 - [You can now use enum variants through type alias.][61682] e.g. You can
3974 write the following:
3976 type MyOption = Option<u8>;
3978 fn increment_or_zero(x: MyOption) -> u8 {
3980 MyOption::Some(y) => y + 1,
3981 MyOption::None => 0,
3985 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3986 `const _: u32 = 5;`.
3987 - [You can now use `#[repr(align(X)]` on enums.][61229]
3988 - [The `?` Kleene macro operator is now available in the
3989 2015 edition.][60932]
3993 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3994 and `-C profile-use` flags.][61268] For more information on how to use profile
3995 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3996 - [The `rust-lldb` wrapper script should now work again.][61827]
4000 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
4004 - [`BufReader::buffer`]
4005 - [`BufWriter::buffer`]
4006 - [`Cell::from_mut`]
4007 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
4008 - [`DoubleEndedIterator::nth_back`]
4010 - [`Wrapping::reverse_bits`]
4011 - [`i128::reverse_bits`]
4012 - [`i16::reverse_bits`]
4013 - [`i32::reverse_bits`]
4014 - [`i64::reverse_bits`]
4015 - [`i8::reverse_bits`]
4016 - [`isize::reverse_bits`]
4017 - [`slice::copy_within`]
4018 - [`u128::reverse_bits`]
4019 - [`u16::reverse_bits`]
4020 - [`u32::reverse_bits`]
4021 - [`u64::reverse_bits`]
4022 - [`u8::reverse_bits`]
4023 - [`usize::reverse_bits`]
4027 - [`Cargo.lock` files are now included by default when publishing executable crates
4028 with executables.][cargo/7026]
4029 - [You can now specify `default-run="foo"` in `[package]` to specify the
4030 default executable to use for `cargo run`.][cargo/7056]
4037 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4038 Please transition your code to using the `..=` syntax for inclusive
4040 - [Using a trait object without the `dyn` will now warn by default.][61203]
4041 Please transition your code to use `dyn Trait` for trait objects instead.
4043 [62228]: https://github.com/rust-lang/rust/pull/62228/
4044 [62235]: https://github.com/rust-lang/rust/pull/62235/
4045 [61802]: https://github.com/rust-lang/rust/pull/61802/
4046 [61827]: https://github.com/rust-lang/rust/pull/61827/
4047 [61547]: https://github.com/rust-lang/rust/pull/61547/
4048 [61682]: https://github.com/rust-lang/rust/pull/61682/
4049 [61268]: https://github.com/rust-lang/rust/pull/61268/
4050 [61342]: https://github.com/rust-lang/rust/pull/61342/
4051 [61347]: https://github.com/rust-lang/rust/pull/61347/
4052 [61100]: https://github.com/rust-lang/rust/pull/61100/
4053 [61203]: https://github.com/rust-lang/rust/pull/61203/
4054 [61229]: https://github.com/rust-lang/rust/pull/61229/
4055 [60932]: https://github.com/rust-lang/rust/pull/60932/
4056 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4057 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4058 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4059 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4060 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4061 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4062 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4063 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4064 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4065 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4066 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4067 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4068 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4069 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4070 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4071 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4072 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4073 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4074 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4075 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4076 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4077 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4078 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4081 Version 1.36.0 (2019-07-04)
4082 ==========================
4086 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4087 - [The order of traits in trait objects no longer affects the semantics of that
4088 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4089 `dyn fmt::Debug + Send`, where this was previously not the case.
4093 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4094 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4095 - [`mem::needs_drop` is now available as a const fn.][60364]
4096 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4097 - [`String` now implements `BorrowMut<str>`.][60404]
4098 - [`io::Cursor` now implements `Default`.][60234]
4099 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4100 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4101 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4102 environment has access to heap memory allocation.
4103 - [`String` now implements `From<&String>`.][59825]
4104 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4105 return a tuple of each argument when there is multiple arguments.
4106 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4111 - [`VecDeque::rotate_left`]
4112 - [`VecDeque::rotate_right`]
4113 - [`Iterator::copied`]
4115 - [`io::IoSliceMut`]
4116 - [`Read::read_vectored`]
4117 - [`Write::write_vectored`]
4118 - [`str::as_mut_ptr`]
4119 - [`mem::MaybeUninit`]
4120 - [`pointer::align_offset`]
4121 - [`future::Future`]
4123 - [`task::RawWaker`]
4124 - [`task::RawWakerVTable`]
4130 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4131 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4133 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4137 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4144 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4145 longer recommended, and will be deprecated in 1.39.0.
4147 [60318]: https://github.com/rust-lang/rust/pull/60318/
4148 [60364]: https://github.com/rust-lang/rust/pull/60364/
4149 [60370]: https://github.com/rust-lang/rust/pull/60370/
4150 [60404]: https://github.com/rust-lang/rust/pull/60404/
4151 [60234]: https://github.com/rust-lang/rust/pull/60234/
4152 [60244]: https://github.com/rust-lang/rust/pull/60244/
4153 [58623]: https://github.com/rust-lang/rust/pull/58623/
4154 [59648]: https://github.com/rust-lang/rust/pull/59648/
4155 [59675]: https://github.com/rust-lang/rust/pull/59675/
4156 [59825]: https://github.com/rust-lang/rust/pull/59825/
4157 [59826]: https://github.com/rust-lang/rust/pull/59826/
4158 [59445]: https://github.com/rust-lang/rust/pull/59445/
4159 [59114]: https://github.com/rust-lang/rust/pull/59114/
4160 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4161 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4162 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4163 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4164 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4165 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4166 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4167 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4168 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4169 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4170 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4171 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4172 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4173 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4174 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4175 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4176 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4177 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4178 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4179 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4182 Version 1.35.0 (2019-05-23)
4183 ==========================
4187 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4188 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4189 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4191 unsafe fn call_unsafe(func: unsafe fn()) {
4196 unsafe { call_unsafe(|| {}); }
4203 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4204 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4205 - [Added the `wasm32-unknown-wasi` target.][59464]
4210 - [`Thread` will now show its ID in `Debug` output.][59460]
4211 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4212 - [`alloc::System` now implements `Default`.][59451]
4213 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4215 - [`char::{ToLowercase, ToUppercase}` now
4216 implement `ExactSizeIterator`.][58778]
4217 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4218 - [Removed the `Read` trait bounds
4219 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4220 - [You can now call the `dbg!` macro without any parameters to print the file
4221 and line where it is called.][57847]
4222 - [In place ASCII case conversions are now up to 4× faster.][59283]
4223 e.g. `str::make_ascii_lowercase`
4224 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4231 - [`RefCell::replace_with`]
4232 - [`RefCell::map_split`]
4234 - [`Range::contains`]
4235 - [`RangeFrom::contains`]
4236 - [`RangeTo::contains`]
4237 - [`RangeInclusive::contains`]
4238 - [`RangeToInclusive::contains`]
4239 - [`Option::copied`]
4243 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4244 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4249 - [The Rust toolchain is now available natively for musl based distros.][58575]
4251 [59460]: https://github.com/rust-lang/rust/pull/59460/
4252 [59464]: https://github.com/rust-lang/rust/pull/59464/
4253 [59500]: https://github.com/rust-lang/rust/pull/59500/
4254 [59512]: https://github.com/rust-lang/rust/pull/59512/
4255 [59580]: https://github.com/rust-lang/rust/pull/59580/
4256 [59283]: https://github.com/rust-lang/rust/pull/59283/
4257 [59451]: https://github.com/rust-lang/rust/pull/59451/
4258 [59076]: https://github.com/rust-lang/rust/pull/59076/
4259 [58778]: https://github.com/rust-lang/rust/pull/58778/
4260 [58717]: https://github.com/rust-lang/rust/pull/58717/
4261 [58369]: https://github.com/rust-lang/rust/pull/58369/
4262 [58423]: https://github.com/rust-lang/rust/pull/58423/
4263 [58080]: https://github.com/rust-lang/rust/pull/58080/
4264 [57847]: https://github.com/rust-lang/rust/pull/57847/
4265 [58575]: https://github.com/rust-lang/rust/pull/58575
4266 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4267 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4268 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4269 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4270 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4271 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4272 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4273 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4274 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4275 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4276 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4277 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4279 Version 1.34.2 (2019-05-14)
4280 ===========================
4282 * [Destabilize the `Error::type_id` function due to a security
4283 vulnerability][60785] ([CVE-2019-12083])
4285 [60785]: https://github.com/rust-lang/rust/pull/60785
4286 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4288 Version 1.34.1 (2019-04-25)
4289 ===========================
4291 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4292 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4293 * [Fix Clippy panic when checking some macros][clippy/3805]
4295 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4296 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4297 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4299 Version 1.34.0 (2019-04-11)
4300 ==========================
4304 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4305 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4307 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4308 `#[attr{}]` procedural macros.][57367]
4309 - [You can now write `extern crate self as foo;`][57407] to import your
4310 crate's root into the extern prelude.
4315 - [You can now target `riscv64imac-unknown-none-elf` and
4316 `riscv64gc-unknown-none-elf`.][58406]
4317 - [You can now enable linker plugin LTO optimisations with
4318 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4319 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4321 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4326 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4327 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4328 the `Hash` trait to create an iterator.
4329 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4330 methods.][58421] Most notably you no longer require the `Ord` trait to create
4332 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4333 for all numeric types.][58044]
4334 - [Indexing a `str` is now generic over all types that
4335 implement `SliceIndex<str>`.][57604]
4336 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4337 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4338 produce a warning if their returning type is unused.
4339 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4340 `overflowing_pow` are now available for all numeric types.][57873] These are
4341 equivalent to methods such as `wrapping_add` for the `pow` operation.
4349 * [`Error::type_id`]
4350 * [`atomic::AtomicI16`]
4351 * [`atomic::AtomicI32`]
4352 * [`atomic::AtomicI64`]
4353 * [`atomic::AtomicI8`]
4354 * [`atomic::AtomicU16`]
4355 * [`atomic::AtomicU32`]
4356 * [`atomic::AtomicU64`]
4357 * [`atomic::AtomicU8`]
4358 * [`convert::Infallible`]
4359 * [`convert::TryFrom`]
4360 * [`convert::TryInto`]
4362 * [`iter::successors`]
4363 * [`num::NonZeroI128`]
4364 * [`num::NonZeroI16`]
4365 * [`num::NonZeroI32`]
4366 * [`num::NonZeroI64`]
4367 * [`num::NonZeroI8`]
4368 * [`num::NonZeroIsize`]
4369 * [`slice::sort_by_cached_key`]
4370 * [`str::escape_debug`]
4371 * [`str::escape_default`]
4372 * [`str::escape_unicode`]
4373 * [`str::split_ascii_whitespace`]
4376 * [`Instant::checked_add`]
4377 * [`Instant::checked_sub`]
4378 * [`SystemTime::checked_add`]
4379 * [`SystemTime::checked_sub`]
4383 - [You can now use alternative registries to crates.io.][cargo/6654]
4387 - [You can now use the `?` operator in your documentation tests without manually
4388 adding `fn main() -> Result<(), _> {}`.][56470]
4392 - [`Command::before_exec` is being replaced by the unsafe method
4393 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4394 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4395 can now use `const` functions in `static` variables.
4397 [58370]: https://github.com/rust-lang/rust/pull/58370/
4398 [58406]: https://github.com/rust-lang/rust/pull/58406/
4399 [58421]: https://github.com/rust-lang/rust/pull/58421/
4400 [58166]: https://github.com/rust-lang/rust/pull/58166/
4401 [58044]: https://github.com/rust-lang/rust/pull/58044/
4402 [58057]: https://github.com/rust-lang/rust/pull/58057/
4403 [58059]: https://github.com/rust-lang/rust/pull/58059/
4404 [57809]: https://github.com/rust-lang/rust/pull/57809/
4405 [57873]: https://github.com/rust-lang/rust/pull/57873/
4406 [57604]: https://github.com/rust-lang/rust/pull/57604/
4407 [57367]: https://github.com/rust-lang/rust/pull/57367/
4408 [57407]: https://github.com/rust-lang/rust/pull/57407/
4409 [57425]: https://github.com/rust-lang/rust/pull/57425/
4410 [57106]: https://github.com/rust-lang/rust/pull/57106/
4411 [56470]: https://github.com/rust-lang/rust/pull/56470/
4412 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4413 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4414 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4415 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4416 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4417 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4418 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4419 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4420 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4421 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4422 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4423 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4424 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4425 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4426 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4427 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4428 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4429 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4430 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4431 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4432 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4433 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4434 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4435 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4436 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4437 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4438 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4439 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4440 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4441 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4442 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4445 Version 1.33.0 (2019-02-28)
4446 ==========================
4450 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4451 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4452 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4453 E.g. You can have match statement on a `u8` that covers `0..=255` and
4454 you would no longer be required to have a `_ => unreachable!()` case.
4455 - [You can now have multiple patterns in `if let` and `while let`
4456 expressions.][57532] You can do this with the same syntax as a `match`
4466 let state = Creature::Crab("Ferris");
4468 if let Creature::Crab(name) | Creature::Person(name) = state {
4469 println!("This creature's name is: {}", name);
4473 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4474 this feature will by default produce a warning as this behaviour can be
4475 unintuitive. E.g. `if let _ = 5 {}`
4476 - [You can now use `let` bindings, assignments, expression statements,
4477 and irrefutable pattern destructuring in const functions.][57175]
4478 - [You can now call unsafe const functions.][57067] E.g.
4480 const unsafe fn foo() -> i32 { 5 }
4481 const fn bar() -> i32 {
4485 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4486 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4487 - [You can now specify a specific alignment with the `#[repr(packed)]`
4488 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4489 with an alignment of 2 bytes and a size of 6 bytes.
4490 - [You can now import an item from a module as an `_`.][56303] This allows you to
4491 import a trait's impls, and not have the name in the namespace. E.g.
4493 use std::io::Read as _;
4495 // Allowed as there is only one `Read` in the module.
4498 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4502 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4503 command line argument.][56351]
4504 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4505 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4506 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4507 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4508 information on Rust's platform support.
4509 - [Added support for the `thumbv7neon-linux-androideabi` and
4510 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4511 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4515 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4516 functions for all numeric types.][57566]
4517 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4518 are now `const` functions for all numeric types.][57105]
4519 - [The methods `is_positive` and `is_negative` are now `const` functions for
4520 all signed numeric types.][57105]
4521 - [The `get` method for all `NonZero` types is now `const`.][57167]
4522 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4523 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4524 numeric types.][57234]
4525 - [`Ipv4Addr::new` is now a `const` function][57234]
4529 - [`unix::FileExt::read_exact_at`]
4530 - [`unix::FileExt::write_all_at`]
4531 - [`Option::transpose`]
4532 - [`Result::transpose`]
4533 - [`convert::identity`]
4536 - [`marker::PhantomPinned`]
4537 - [`Vec::resize_with`]
4538 - [`VecDeque::resize_with`]
4539 - [`Duration::as_millis`]
4540 - [`Duration::as_micros`]
4541 - [`Duration::as_nanos`]
4546 - [You can now publish crates that require a feature flag to compile with
4547 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4548 - [Cargo should now rebuild a crate if a file was modified during the initial
4553 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4554 are now deprecated in the standard library, and their usage will now produce a warning.
4555 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4557 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4559 - [Libtest no longer creates a new thread for each test when
4560 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4562 [56243]: https://github.com/rust-lang/rust/pull/56243
4563 [56303]: https://github.com/rust-lang/rust/pull/56303/
4564 [56351]: https://github.com/rust-lang/rust/pull/56351/
4565 [56362]: https://github.com/rust-lang/rust/pull/56362
4566 [56642]: https://github.com/rust-lang/rust/pull/56642/
4567 [56769]: https://github.com/rust-lang/rust/pull/56769/
4568 [56805]: https://github.com/rust-lang/rust/pull/56805
4569 [56947]: https://github.com/rust-lang/rust/pull/56947/
4570 [57049]: https://github.com/rust-lang/rust/pull/57049/
4571 [57067]: https://github.com/rust-lang/rust/pull/57067/
4572 [57105]: https://github.com/rust-lang/rust/pull/57105
4573 [57130]: https://github.com/rust-lang/rust/pull/57130/
4574 [57167]: https://github.com/rust-lang/rust/pull/57167/
4575 [57175]: https://github.com/rust-lang/rust/pull/57175/
4576 [57234]: https://github.com/rust-lang/rust/pull/57234/
4577 [57332]: https://github.com/rust-lang/rust/pull/57332/
4578 [57465]: https://github.com/rust-lang/rust/pull/57465/
4579 [57532]: https://github.com/rust-lang/rust/pull/57532/
4580 [57535]: https://github.com/rust-lang/rust/pull/57535/
4581 [57566]: https://github.com/rust-lang/rust/pull/57566/
4582 [57615]: https://github.com/rust-lang/rust/pull/57615/
4583 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4584 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4585 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4586 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4587 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4588 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4589 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4590 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4591 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4592 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4593 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4594 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4595 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4596 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4597 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4598 [platform-support]: https://forge.rust-lang.org/platform-support.html
4600 Version 1.32.0 (2019-01-17)
4601 ==========================
4606 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4607 operator allows you to specify zero or one repetitions similar to the `*` and
4609 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4610 now always resolve to the item (`enum`, `struct`, etc.) available in the
4611 module if present, before resolving to a external crate or an item the prelude.][56759]
4614 enum Color { Red, Green, Blue }
4620 - [You can now match against `PhantomData<T>` types.][55837]
4621 - [You can now match against literals in macros with the `literal`
4622 specifier.][56072] This will match against a literal of any type.
4623 E.g. `1`, `'A'`, `"Hello World"`
4624 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4626 struct Point(i32, i32);
4629 pub fn new(x: i32, y: i32) -> Self {
4633 pub fn is_origin(&self) -> bool {
4641 - [Self can also now be used in type definitions.][56366] E.g.
4645 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4648 Cons(T, Box<Self>) // likewise here
4651 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4652 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4656 - [The default allocator has changed from jemalloc to the default allocator on
4657 your system.][55238] The compiler itself on Linux & macOS will still use
4658 jemalloc, but programs compiled with it will use the system allocator.
4659 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4663 - [`PathBuf` now implements `FromStr`.][55148]
4664 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4665 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4666 easily debug expressions in your rust program. E.g.
4669 let b = dbg!(a * 2) + 1;
4670 // ^-- prints: [src/main.rs:4] a * 2 = 4
4674 The following APIs are now `const` functions and can be used in a
4678 - [`UnsafeCell::get`]
4679 - [`char::is_ascii`]
4681 - [`ManuallyDrop::new`]
4682 - [`ManuallyDrop::into_inner`]
4683 - [`RangeInclusive::start`]
4684 - [`RangeInclusive::end`]
4685 - [`NonNull::as_ptr`]
4688 - [`Duration::as_secs`]
4689 - [`Duration::subsec_millis`]
4690 - [`Duration::subsec_micros`]
4691 - [`Duration::subsec_nanos`]
4693 - [`Ipv4Addr::is_unspecified`]
4695 - [`Ipv6Addr::octets`]
4699 - [`i8::to_be_bytes`]
4700 - [`i8::to_le_bytes`]
4701 - [`i8::to_ne_bytes`]
4702 - [`i8::from_be_bytes`]
4703 - [`i8::from_le_bytes`]
4704 - [`i8::from_ne_bytes`]
4705 - [`i16::to_be_bytes`]
4706 - [`i16::to_le_bytes`]
4707 - [`i16::to_ne_bytes`]
4708 - [`i16::from_be_bytes`]
4709 - [`i16::from_le_bytes`]
4710 - [`i16::from_ne_bytes`]
4711 - [`i32::to_be_bytes`]
4712 - [`i32::to_le_bytes`]
4713 - [`i32::to_ne_bytes`]
4714 - [`i32::from_be_bytes`]
4715 - [`i32::from_le_bytes`]
4716 - [`i32::from_ne_bytes`]
4717 - [`i64::to_be_bytes`]
4718 - [`i64::to_le_bytes`]
4719 - [`i64::to_ne_bytes`]
4720 - [`i64::from_be_bytes`]
4721 - [`i64::from_le_bytes`]
4722 - [`i64::from_ne_bytes`]
4723 - [`i128::to_be_bytes`]
4724 - [`i128::to_le_bytes`]
4725 - [`i128::to_ne_bytes`]
4726 - [`i128::from_be_bytes`]
4727 - [`i128::from_le_bytes`]
4728 - [`i128::from_ne_bytes`]
4729 - [`isize::to_be_bytes`]
4730 - [`isize::to_le_bytes`]
4731 - [`isize::to_ne_bytes`]
4732 - [`isize::from_be_bytes`]
4733 - [`isize::from_le_bytes`]
4734 - [`isize::from_ne_bytes`]
4735 - [`u8::to_be_bytes`]
4736 - [`u8::to_le_bytes`]
4737 - [`u8::to_ne_bytes`]
4738 - [`u8::from_be_bytes`]
4739 - [`u8::from_le_bytes`]
4740 - [`u8::from_ne_bytes`]
4741 - [`u16::to_be_bytes`]
4742 - [`u16::to_le_bytes`]
4743 - [`u16::to_ne_bytes`]
4744 - [`u16::from_be_bytes`]
4745 - [`u16::from_le_bytes`]
4746 - [`u16::from_ne_bytes`]
4747 - [`u32::to_be_bytes`]
4748 - [`u32::to_le_bytes`]
4749 - [`u32::to_ne_bytes`]
4750 - [`u32::from_be_bytes`]
4751 - [`u32::from_le_bytes`]
4752 - [`u32::from_ne_bytes`]
4753 - [`u64::to_be_bytes`]
4754 - [`u64::to_le_bytes`]
4755 - [`u64::to_ne_bytes`]
4756 - [`u64::from_be_bytes`]
4757 - [`u64::from_le_bytes`]
4758 - [`u64::from_ne_bytes`]
4759 - [`u128::to_be_bytes`]
4760 - [`u128::to_le_bytes`]
4761 - [`u128::to_ne_bytes`]
4762 - [`u128::from_be_bytes`]
4763 - [`u128::from_le_bytes`]
4764 - [`u128::from_ne_bytes`]
4765 - [`usize::to_be_bytes`]
4766 - [`usize::to_le_bytes`]
4767 - [`usize::to_ne_bytes`]
4768 - [`usize::from_be_bytes`]
4769 - [`usize::from_le_bytes`]
4770 - [`usize::from_ne_bytes`]
4774 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4775 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4779 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4783 - [The argument types for AVX's
4784 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4785 been changed from `*const` to `*mut` as the previous implementation
4789 [55148]: https://github.com/rust-lang/rust/pull/55148/
4790 [55238]: https://github.com/rust-lang/rust/pull/55238/
4791 [55280]: https://github.com/rust-lang/rust/pull/55280/
4792 [55610]: https://github.com/rust-lang/rust/pull/55610/
4793 [55663]: https://github.com/rust-lang/rust/pull/55663/
4794 [55702]: https://github.com/rust-lang/rust/pull/55702/
4795 [55837]: https://github.com/rust-lang/rust/pull/55837/
4796 [55843]: https://github.com/rust-lang/rust/pull/55843/
4797 [56072]: https://github.com/rust-lang/rust/pull/56072/
4798 [56245]: https://github.com/rust-lang/rust/pull/56245/
4799 [56365]: https://github.com/rust-lang/rust/pull/56365/
4800 [56366]: https://github.com/rust-lang/rust/pull/56366/
4801 [56395]: https://github.com/rust-lang/rust/pull/56395/
4802 [56759]: https://github.com/rust-lang/rust/pull/56759/
4803 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4804 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4805 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4806 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4807 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4808 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4809 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4810 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4811 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4812 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4813 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4814 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4815 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4816 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4817 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4818 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4819 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4820 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4821 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4822 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4823 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4824 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4825 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4826 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4827 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4828 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4829 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4830 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4831 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4832 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4833 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4834 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4835 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4836 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4837 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4838 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4839 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4840 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4841 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4842 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4843 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4844 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4845 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4846 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4847 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4848 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4849 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4850 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4851 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4852 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4853 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4854 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4855 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4856 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4857 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4858 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4859 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4860 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4861 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4862 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4863 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4864 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4865 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4866 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4867 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4868 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4869 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4870 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4871 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4872 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4873 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4874 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4875 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4876 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4877 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4878 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4879 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4880 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4881 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4882 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4883 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4884 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4885 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4886 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4887 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4888 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4889 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4890 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4891 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4892 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4893 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4894 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4895 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4898 Version 1.31.1 (2018-12-20)
4899 ===========================
4901 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4902 - [Fix broken go-to-definition in RLS][rls/1171]
4903 - [Fix infinite loop on hover in RLS][rls/1170]
4905 [56562]: https://github.com/rust-lang/rust/pull/56562
4906 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4907 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4909 Version 1.31.0 (2018-12-06)
4910 ==========================
4914 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4915 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4916 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4917 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4919 - [You can now define and use `const` functions.][54835] These are currently
4920 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4921 [language reference][const-reference] for what exactly is available.
4922 - [You can now use tool lints, which allow you to scope lints from external
4923 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4924 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4925 a crate, not just in exported functions.][54451]
4926 - [You can now use parentheses in pattern matches.][54497]
4930 - [Updated musl to 1.1.20][54430]
4934 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4935 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4936 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4937 into `Option<&mut T>` using the `From` trait.][53218]
4938 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4943 - [`slice::align_to`]
4944 - [`slice::align_to_mut`]
4945 - [`slice::chunks_exact`]
4946 - [`slice::chunks_exact_mut`]
4947 - [`slice::rchunks`]
4948 - [`slice::rchunks_mut`]
4949 - [`slice::rchunks_exact`]
4950 - [`slice::rchunks_exact_mut`]
4951 - [`Option::replace`]
4955 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4956 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4957 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4959 [52813]: https://github.com/rust-lang/rust/pull/52813/
4960 [53218]: https://github.com/rust-lang/rust/pull/53218/
4961 [54057]: https://github.com/rust-lang/rust/pull/54057/
4962 [54240]: https://github.com/rust-lang/rust/pull/54240/
4963 [54430]: https://github.com/rust-lang/rust/pull/54430/
4964 [54451]: https://github.com/rust-lang/rust/pull/54451/
4965 [54497]: https://github.com/rust-lang/rust/pull/54497/
4966 [54778]: https://github.com/rust-lang/rust/pull/54778/
4967 [54835]: https://github.com/rust-lang/rust/pull/54835/
4968 [54870]: https://github.com/rust-lang/rust/pull/54870/
4969 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4970 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4971 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4972 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4973 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4974 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4975 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4976 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4977 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4978 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4979 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4980 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4981 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4982 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4984 Version 1.30.1 (2018-11-08)
4985 ===========================
4987 - [Fixed overflow ICE in rustdoc][54199]
4988 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4990 [54199]: https://github.com/rust-lang/rust/pull/54199
4991 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4993 Version 1.30.0 (2018-10-25)
4994 ==========================
4998 - [Procedural macros are now available.][52081] These kinds of macros allow for
4999 more powerful code generation. There is a [new chapter available][proc-macros]
5000 in the Rust Programming Language book that goes further in depth.
5001 - [You can now use keywords as identifiers using the raw identifiers
5002 syntax (`r#`),][53236] e.g. `let r#for = true;`
5003 - [Using anonymous parameters in traits is now deprecated with a warning and
5004 will be a hard error in the 2018 edition.][53272]
5005 - [You can now use `crate` in paths.][54404] This allows you to refer to the
5006 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
5007 - [Using a external crate no longer requires being prefixed with `::`.][54404]
5008 Previously, using a external crate in a module without a use statement
5009 required `let json = ::serde_json::from_str(foo);` but can now be written
5010 as `let json = serde_json::from_str(foo);`.
5011 - [You can now apply the `#[used]` attribute to static items to prevent the
5012 compiler from optimising them away, even if they appear to be unused,][51363]
5013 e.g. `#[used] static FOO: u32 = 1;`
5014 - [You can now import and reexport macros from other crates with the `use`
5015 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5016 the root module of the crate. If your macro relies on calling other local
5017 macros, it is recommended to export with the
5018 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5020 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5021 using the `vis` specifier.][53370]
5022 - [Non-macro attributes now allow all forms of literals, not just
5023 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5024 write `#[attr(true)]`.
5025 - [You can now specify a function to handle a panic in the Rust runtime with the
5026 `#[panic_handler]` attribute.][51366]
5030 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5031 - [Added the `aarch64-unknown-netbsd` target][53165]
5032 - [Upgraded to LLVM 8.][53611]
5036 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5040 - [`Ipv4Addr::BROADCAST`]
5041 - [`Ipv4Addr::LOCALHOST`]
5042 - [`Ipv4Addr::UNSPECIFIED`]
5043 - [`Ipv6Addr::LOCALHOST`]
5044 - [`Ipv6Addr::UNSPECIFIED`]
5045 - [`Iterator::find_map`]
5047 The following methods are replacement methods for `trim_left`, `trim_right`,
5048 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5050 - [`str::trim_end_matches`]
5052 - [`str::trim_start_matches`]
5053 - [`str::trim_start`]
5057 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5058 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5059 equivalent to calling `rustdoc --error-format=json`.
5060 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5064 - [`rustdoc` allows you to specify what edition to treat your code as with the
5065 `--edition` option.][54057]
5066 - [`rustdoc` now has the `--color` (specify whether to output color) and
5067 `--error-format` (specify error format, e.g. `json`) options.][53003]
5068 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5069 debug symbols.][53774]
5070 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5071 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5073 [50911]: https://github.com/rust-lang/rust/pull/50911/
5074 [51363]: https://github.com/rust-lang/rust/pull/51363/
5075 [51366]: https://github.com/rust-lang/rust/pull/51366/
5076 [52081]: https://github.com/rust-lang/rust/pull/52081/
5077 [53003]: https://github.com/rust-lang/rust/pull/53003/
5078 [53033]: https://github.com/rust-lang/rust/pull/53033/
5079 [53044]: https://github.com/rust-lang/rust/pull/53044/
5080 [53165]: https://github.com/rust-lang/rust/pull/53165/
5081 [53611]: https://github.com/rust-lang/rust/pull/53611/
5082 [53236]: https://github.com/rust-lang/rust/pull/53236/
5083 [53272]: https://github.com/rust-lang/rust/pull/53272/
5084 [53370]: https://github.com/rust-lang/rust/pull/53370/
5085 [53459]: https://github.com/rust-lang/rust/pull/53459/
5086 [53774]: https://github.com/rust-lang/rust/pull/53774/
5087 [53822]: https://github.com/rust-lang/rust/pull/53822/
5088 [54057]: https://github.com/rust-lang/rust/pull/54057/
5089 [54404]: https://github.com/rust-lang/rust/pull/54404/
5090 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5091 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5092 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5093 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5095 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5096 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5097 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5098 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5099 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5100 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5101 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5102 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5103 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5104 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5107 Version 1.29.2 (2018-10-11)
5108 ===========================
5110 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5111 - The `rls-preview` component on the windows-gnu targets has been restored.
5113 [54639]: https://github.com/rust-lang/rust/pull/54639
5116 Version 1.29.1 (2018-09-25)
5117 ===========================
5122 - The standard library's `str::repeat` function contained an out of bounds write
5123 caused by an integer overflow. This has been fixed by deterministically
5124 panicking when an overflow happens.
5126 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5130 Version 1.29.0 (2018-09-13)
5131 ==========================
5135 - [Bumped minimum LLVM version to 5.0.][51899]
5136 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5137 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5138 - [Upgraded to LLVM 7.][51966]
5142 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5143 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5144 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5145 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5147 - [`Cell<T>` now allows `T` to be unsized.][50494]
5148 - [`SocketAddr` is now stable on Redox.][52656]
5153 - [`Iterator::flatten`]
5158 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5159 `--locked` to disable this behavior.
5160 - [`cargo-install` will now allow you to cross compile an install
5161 using `--target`.][cargo/5614]
5162 - [Added the `cargo-fix` subcommand to automatically move project code from
5163 2015 edition to 2018.][cargo/5723]
5164 - [`cargo doc` can now optionally document private types using the
5165 `--document-private-items` flag.][cargo/5543]
5169 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5170 the specified level to that level.][52354] For example `--cap-lints warn`
5171 will demote `deny` and `forbid` lints to `warn`.
5172 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5173 fails and `101` if there is a panic.][52197]
5174 - [A preview of clippy has been made available through rustup.][51122]
5175 You can install the preview with `rustup component add clippy-preview`.
5179 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5180 Use `str::get_unchecked(begin..end)` instead.
5181 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5182 Consider using the `home_dir` function from
5183 https://crates.io/crates/dirs instead.
5184 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5185 - [`cfg` attributes and `--cfg` command line flags are now more
5186 strictly validated.][53893]
5188 [53893]: https://github.com/rust-lang/rust/pull/53893/
5189 [52861]: https://github.com/rust-lang/rust/pull/52861/
5190 [51966]: https://github.com/rust-lang/rust/pull/51966/
5191 [52656]: https://github.com/rust-lang/rust/pull/52656/
5192 [52239]: https://github.com/rust-lang/rust/pull/52239/
5193 [52330]: https://github.com/rust-lang/rust/pull/52330/
5194 [52354]: https://github.com/rust-lang/rust/pull/52354/
5195 [52402]: https://github.com/rust-lang/rust/pull/52402/
5196 [52197]: https://github.com/rust-lang/rust/pull/52197/
5197 [51807]: https://github.com/rust-lang/rust/pull/51807/
5198 [51899]: https://github.com/rust-lang/rust/pull/51899/
5199 [51912]: https://github.com/rust-lang/rust/pull/51912/
5200 [51619]: https://github.com/rust-lang/rust/pull/51619/
5201 [51656]: https://github.com/rust-lang/rust/pull/51656/
5202 [51178]: https://github.com/rust-lang/rust/pull/51178/
5203 [51122]: https://github.com/rust-lang/rust/pull/51122
5204 [50494]: https://github.com/rust-lang/rust/pull/50494/
5205 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5206 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5207 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5208 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5209 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5210 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5211 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5214 Version 1.28.0 (2018-08-02)
5215 ===========================
5219 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5220 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5221 the inner type across Foreign Function Interface (FFI) boundaries.
5222 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5223 and can now be used as identifiers.][51196]
5224 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5225 stable.][51241] This will allow users to specify a global allocator for
5227 - [Unit test functions marked with the `#[test]` attribute can now return
5228 `Result<(), E: Debug>` in addition to `()`.][51298]
5229 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5230 allows macros to easily target lifetimes.
5234 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5235 prioritise making smaller binary sizes. `z` is the same as `s` with the
5236 exception that it does not vectorise loops, which typically results in an even
5238 - [The short error format is now stable.][49546] Specified with
5239 `--error-format=short` this option will provide a more compressed output of
5240 rust error messages.
5241 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5242 - [Reduced the number of allocations in the macro parser.][50855] This can
5243 improve compile times of macro heavy crates on average by 5%.
5247 - [Implemented `Default` for `&mut str`.][51306]
5248 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5249 - [Implemented `Extend` for `()`.][50234]
5250 - [The `Debug` implementation of `time::Duration` should now be more easily
5251 human readable.][50364] Previously a `Duration` of one second would printed as
5252 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5253 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5254 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5255 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5256 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5257 for `PathBuf`.][50170]
5258 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5259 and `Wrapping<i128>`.][50465]
5260 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5261 possible.][51050] This can provide up to a 40% speed increase.
5262 - [Improved error messages when using `format!`.][50610]
5266 - [`Iterator::step_by`]
5267 - [`Path::ancestors`]
5268 - [`SystemTime::UNIX_EPOCH`]
5269 - [`alloc::GlobalAlloc`]
5271 - [`alloc::LayoutErr`]
5274 - [`alloc::alloc_zeroed`]
5275 - [`alloc::dealloc`]
5276 - [`alloc::realloc`]
5277 - [`alloc::handle_alloc_error`]
5278 - [`btree_map::Entry::or_default`]
5279 - [`fmt::Alignment`]
5280 - [`hash_map::Entry::or_default`]
5281 - [`iter::repeat_with`]
5282 - [`num::NonZeroUsize`]
5283 - [`num::NonZeroU128`]
5284 - [`num::NonZeroU16`]
5285 - [`num::NonZeroU32`]
5286 - [`num::NonZeroU64`]
5287 - [`num::NonZeroU8`]
5288 - [`ops::RangeBounds`]
5289 - [`slice::SliceIndex`]
5290 - [`slice::from_mut`]
5291 - [`slice::from_ref`]
5292 - [`{Any + Send + Sync}::downcast_mut`]
5293 - [`{Any + Send + Sync}::downcast_ref`]
5294 - [`{Any + Send + Sync}::is`]
5298 - [Cargo will now no longer allow you to publish crates with build scripts that
5299 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5300 considered to be immutable.
5304 - [The `suggestion_applicability` field in `rustc`'s json output is now
5305 stable.][50486] This will allow dev tools to check whether a code suggestion
5306 would apply to them.
5310 - [Rust will consider trait objects with duplicated constraints to be the same
5311 type as without the duplicated constraint.][51276] For example the below code will
5312 now fail to compile.
5317 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5320 impl Trait + Send + Send {
5321 fn test(&self) { println!("two"); }
5325 [49546]: https://github.com/rust-lang/rust/pull/49546/
5326 [50143]: https://github.com/rust-lang/rust/pull/50143/
5327 [50170]: https://github.com/rust-lang/rust/pull/50170/
5328 [50234]: https://github.com/rust-lang/rust/pull/50234/
5329 [50265]: https://github.com/rust-lang/rust/pull/50265/
5330 [50364]: https://github.com/rust-lang/rust/pull/50364/
5331 [50385]: https://github.com/rust-lang/rust/pull/50385/
5332 [50465]: https://github.com/rust-lang/rust/pull/50465/
5333 [50486]: https://github.com/rust-lang/rust/pull/50486/
5334 [50554]: https://github.com/rust-lang/rust/pull/50554/
5335 [50610]: https://github.com/rust-lang/rust/pull/50610/
5336 [50855]: https://github.com/rust-lang/rust/pull/50855/
5337 [51050]: https://github.com/rust-lang/rust/pull/51050/
5338 [51196]: https://github.com/rust-lang/rust/pull/51196/
5339 [51241]: https://github.com/rust-lang/rust/pull/51241/
5340 [51276]: https://github.com/rust-lang/rust/pull/51276/
5341 [51298]: https://github.com/rust-lang/rust/pull/51298/
5342 [51306]: https://github.com/rust-lang/rust/pull/51306/
5343 [51562]: https://github.com/rust-lang/rust/pull/51562/
5344 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5345 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5346 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5347 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5348 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5349 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5350 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5351 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5352 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5353 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5354 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5355 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5356 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5357 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5358 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5359 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5360 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5361 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5362 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5363 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5364 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5365 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5366 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5367 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5368 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5369 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5370 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5371 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5372 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5373 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5375 Version 1.27.2 (2018-07-20)
5376 ===========================
5381 - The borrow checker was fixed to avoid potential unsoundness when using
5382 match ergonomics: [#52213][52213].
5384 [52213]: https://github.com/rust-lang/rust/issues/52213
5386 Version 1.27.1 (2018-07-10)
5387 ===========================
5392 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5393 when running, which enabled executing code as some other user on a
5394 given machine. This release fixes that vulnerability; you can read
5395 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5397 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5402 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5403 match ergonomics: [#51415][51415], [#49534][49534].
5405 [51415]: https://github.com/rust-lang/rust/issues/51415
5406 [49534]: https://github.com/rust-lang/rust/issues/49534
5407 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5408 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5410 Version 1.27.0 (2018-06-21)
5411 ==========================
5415 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5416 be used as an identifier.
5417 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5418 bare `Trait` syntax, and should make it clearer when being used in tandem with
5419 `impl Trait` because it is equivalent to the following syntax:
5420 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5421 `Box<Trait> == Box<dyn Trait>`.
5422 - [Attributes on generic parameters such as types and lifetimes are
5423 now stable.][48851] e.g.
5424 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5425 - [The `#[must_use]` attribute can now also be used on functions as well as
5426 types.][48925] It provides a lint that by default warns users when the
5427 value returned by a function has not been used.
5431 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5435 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5436 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5437 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5438 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5439 the `cfg` attribute.
5440 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5441 std are now available in core.][49896]
5442 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5444 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5445 that the operation isn't done in place.
5446 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5447 the `#[must_use]` attribute][49533] to warn about unused potentially
5448 expensive allocations.
5452 - [`DoubleEndedIterator::rfind`]
5453 - [`DoubleEndedIterator::rfold`]
5454 - [`DoubleEndedIterator::try_rfold`]
5455 - [`Duration::from_micros`]
5456 - [`Duration::from_nanos`]
5457 - [`Duration::subsec_micros`]
5458 - [`Duration::subsec_millis`]
5459 - [`HashMap::remove_entry`]
5460 - [`Iterator::try_fold`]
5461 - [`Iterator::try_for_each`]
5463 - [`Option::filter`]
5464 - [`String::replace_range`]
5465 - [`Take::set_limit`]
5466 - [`hint::unreachable_unchecked`]
5467 - [`os::unix::process::parent_id`]
5468 - [`ptr::swap_nonoverlapping`]
5469 - [`slice::rsplit_mut`]
5471 - [`slice::swap_with_slice`]
5475 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5476 `readme`, and `repository` fields.][cargo/5386]
5477 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5478 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5479 a different directory than `target` for placing compilation artifacts.
5480 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5481 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5482 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5483 where cargo would infer a binary, Cargo will produce a warning. You can
5484 disable this feature ahead of time by setting any of the following to false:
5485 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5486 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5487 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5491 - [Added “The Rustc book” into the official documentation.][49707]
5492 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5493 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5497 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5498 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5499 compile, `"".is_empty()` will still compile.
5500 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5501 will only print the inner type.][48553] E.g.
5502 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5503 not `AtomicBool(true)`.
5504 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5505 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5506 alignment should cover all use cases.
5507 - The `.description()` method on the `std::error::Error` trait
5508 [has been soft-deprecated][50163]. It is no longer required to implement it.
5510 [48553]: https://github.com/rust-lang/rust/pull/48553/
5511 [48851]: https://github.com/rust-lang/rust/pull/48851/
5512 [48925]: https://github.com/rust-lang/rust/pull/48925/
5513 [49533]: https://github.com/rust-lang/rust/pull/49533/
5514 [49623]: https://github.com/rust-lang/rust/pull/49623/
5515 [49630]: https://github.com/rust-lang/rust/pull/49630/
5516 [49664]: https://github.com/rust-lang/rust/pull/49664/
5517 [49699]: https://github.com/rust-lang/rust/pull/49699/
5518 [49707]: https://github.com/rust-lang/rust/pull/49707/
5519 [49896]: https://github.com/rust-lang/rust/pull/49896/
5520 [49968]: https://github.com/rust-lang/rust/pull/49968/
5521 [50163]: https://github.com/rust-lang/rust/pull/50163
5522 [50177]: https://github.com/rust-lang/rust/pull/50177/
5523 [50378]: https://github.com/rust-lang/rust/pull/50378/
5524 [50423]: https://github.com/rust-lang/rust/pull/50423/
5525 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5526 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5527 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5528 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5529 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5530 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5531 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5532 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5533 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5534 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5535 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5536 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5537 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5538 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5539 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5540 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5541 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5542 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5543 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5544 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5545 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5546 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5547 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5548 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5549 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5550 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5551 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5552 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5553 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5556 Version 1.26.2 (2018-06-05)
5557 ==========================
5562 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5564 [51117]: https://github.com/rust-lang/rust/issues/51117
5567 Version 1.26.1 (2018-05-29)
5568 ==========================
5573 - [RLS now works on Windows.][50646]
5574 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5580 - [`fn main() -> impl Trait` no longer works for non-Termination
5582 This reverts an accidental stabilization.
5583 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5584 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5586 [50646]: https://github.com/rust-lang/rust/issues/50646
5587 [50656]: https://github.com/rust-lang/rust/pull/50656
5588 [50812]: https://github.com/rust-lang/rust/pull/50812
5589 [50950]: https://github.com/rust-lang/rust/issues/50950
5590 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5592 Version 1.26.0 (2018-05-10)
5593 ==========================
5597 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5598 implement either or both traits.][49299]
5599 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5600 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5601 lifetime can be elided.][49458]
5602 - [`impl Trait` is now stable allowing you to have abstract types in returns
5603 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5604 `fn open(path: impl AsRef<Path>)`.
5605 - [Pattern matching will now automatically apply dereferences.][49394]
5606 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5607 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5608 - [A lot of operations are now available in a const context.][46882] E.g. You
5609 can now index into constant arrays, reference and dereference into constants,
5610 and use tuple struct constructors.
5611 - [Fixed entry slice patterns are now stable.][48516] E.g.
5613 let points = [1, 2, 3, 4];
5615 [1, 2, 3, 4] => println!("All points were sequential."),
5616 _ => println!("Not all points were sequential."),
5623 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5624 - [Fixed exponential projection complexity on nested types.][48296]
5625 This can provide up to a ~12% reduction in compile times for certain crates.
5626 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5627 to remap path prefixes outputted by the compiler.
5628 - [Added `powerpc-unknown-netbsd` target.][48281]
5632 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5633 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5634 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5635 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5636 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5637 - [`ascii::escape_default` is now available in libcore.][48735]
5638 - [Trailing commas are now supported in std and core macros.][48056]
5639 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5640 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5645 - [`*const T::copy_to_nonoverlapping`]
5646 - [`*const T::copy_to`]
5647 - [`*const T::read_unaligned`]
5648 - [`*const T::read_volatile`]
5649 - [`*const T::read`]
5651 - [`*const T::wrapping_add`]
5652 - [`*const T::wrapping_sub`]
5654 - [`*mut T::copy_to_nonoverlapping`]
5655 - [`*mut T::copy_to`]
5656 - [`*mut T::read_unaligned`]
5657 - [`*mut T::read_volatile`]
5659 - [`*mut T::replace`]
5662 - [`*mut T::wrapping_add`]
5663 - [`*mut T::wrapping_sub`]
5664 - [`*mut T::write_bytes`]
5665 - [`*mut T::write_unaligned`]
5666 - [`*mut T::write_volatile`]
5669 - [`FromUtf8Error::as_bytes`]
5670 - [`LocalKey::try_with`]
5671 - [`Option::cloned`]
5672 - [`btree_map::Entry::and_modify`]
5673 - [`fs::read_to_string`]
5676 - [`hash_map::Entry::and_modify`]
5677 - [`iter::FusedIterator`]
5678 - [`ops::RangeInclusive`]
5679 - [`ops::RangeToInclusive`]
5681 - [`slice::rotate_left`]
5682 - [`slice::rotate_right`]
5683 - [`String::retain`]
5688 - [Cargo will now output path to custom commands when `-v` is
5689 passed with `--list`][cargo/5041]
5690 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5694 - [The second edition of "The Rust Programming Language" book is now recommended
5695 over the first.][48404]
5700 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5701 syntax is now invalid.
5703 use std::ops::Fn as dyn;
5704 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5706 - [The result of dereferences are no longer promoted to `'static`.][47408]
5710 const PAIR: &(i32, i32) = &(0, 1);
5711 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5714 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5715 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5717 - [Removed hoedown from rustdoc.][48274]
5718 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5720 [46882]: https://github.com/rust-lang/rust/pull/46882
5721 [47379]: https://github.com/rust-lang/rust/pull/47379
5722 [47408]: https://github.com/rust-lang/rust/pull/47408
5723 [47813]: https://github.com/rust-lang/rust/pull/47813
5724 [48056]: https://github.com/rust-lang/rust/pull/48056
5725 [48125]: https://github.com/rust-lang/rust/pull/48125
5726 [48235]: https://github.com/rust-lang/rust/pull/48235
5727 [48274]: https://github.com/rust-lang/rust/pull/48274
5728 [48281]: https://github.com/rust-lang/rust/pull/48281
5729 [48296]: https://github.com/rust-lang/rust/pull/48296
5730 [48326]: https://github.com/rust-lang/rust/pull/48326
5731 [48359]: https://github.com/rust-lang/rust/pull/48359
5732 [48404]: https://github.com/rust-lang/rust/pull/48404
5733 [48481]: https://github.com/rust-lang/rust/pull/48481
5734 [48516]: https://github.com/rust-lang/rust/pull/48516
5735 [48628]: https://github.com/rust-lang/rust/pull/48628
5736 [48629]: https://github.com/rust-lang/rust/pull/48629
5737 [48657]: https://github.com/rust-lang/rust/pull/48657
5738 [48735]: https://github.com/rust-lang/rust/pull/48735
5739 [48978]: https://github.com/rust-lang/rust/pull/48978
5740 [49101]: https://github.com/rust-lang/rust/pull/49101
5741 [49109]: https://github.com/rust-lang/rust/pull/49109
5742 [49162]: https://github.com/rust-lang/rust/pull/49162
5743 [49255]: https://github.com/rust-lang/rust/pull/49255
5744 [49299]: https://github.com/rust-lang/rust/pull/49299
5745 [49305]: https://github.com/rust-lang/rust/pull/49305
5746 [49394]: https://github.com/rust-lang/rust/pull/49394
5747 [49458]: https://github.com/rust-lang/rust/pull/49458
5748 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5749 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5750 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5751 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5752 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5753 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5754 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5755 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5756 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5757 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5758 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5759 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5760 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5761 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5762 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5763 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5764 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5765 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5766 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5767 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5768 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5769 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5770 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5771 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5772 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5773 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5774 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5775 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5776 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5777 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5778 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5779 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5780 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5781 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5782 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5783 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5784 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5785 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5786 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5787 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5788 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5789 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5792 Version 1.25.0 (2018-03-29)
5793 ==========================
5797 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5798 - [You can now use nested groups of imports.][47948]
5799 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5800 - [You can now have `|` at the start of a match arm.][47947] e.g.
5802 enum Foo { A, B, C }
5808 | Foo::B => println!("AB"),
5809 | Foo::C => println!("C"),
5816 - [Upgraded to LLVM 6.][47828]
5817 - [Added `-C lto=val` option.][47521]
5818 - [Added `i586-unknown-linux-musl` target][47282]
5822 - [Impl Send for `process::Command` on Unix.][47760]
5823 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5824 - [`UnsafeCell::into_inner` is now safe.][47204]
5825 - [Implement libstd for CloudABI.][47268]
5826 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5827 - [Implement `AsRef<Path>` for Component][46985]
5828 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5829 - [Moved `Duration` to libcore.][46666]
5833 - [`Location::column`]
5836 The following functions can now be used in a constant expression.
5837 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5838 - [`Duration::new`][47300]
5839 - [`Duration::from_secs`][47300]
5840 - [`Duration::from_millis`][47300]
5844 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5845 - [`cargo new` now defaults to creating a binary crate, instead of a
5846 library crate.][cargo/5029]
5850 - [Rust by example is now shipped with new releases][46196]
5854 - [Deprecated `net::lookup_host`.][47510]
5855 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5856 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5857 around indexing operations (see [#47349][47349]). This has been fixed (which also
5858 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5859 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5861 [33903]: https://github.com/rust-lang/rust/pull/33903
5862 [47947]: https://github.com/rust-lang/rust/pull/47947
5863 [47948]: https://github.com/rust-lang/rust/pull/47948
5864 [47760]: https://github.com/rust-lang/rust/pull/47760
5865 [47790]: https://github.com/rust-lang/rust/pull/47790
5866 [47828]: https://github.com/rust-lang/rust/pull/47828
5867 [47398]: https://github.com/rust-lang/rust/pull/47398
5868 [47510]: https://github.com/rust-lang/rust/pull/47510
5869 [47521]: https://github.com/rust-lang/rust/pull/47521
5870 [47204]: https://github.com/rust-lang/rust/pull/47204
5871 [47251]: https://github.com/rust-lang/rust/pull/47251
5872 [47268]: https://github.com/rust-lang/rust/pull/47268
5873 [47282]: https://github.com/rust-lang/rust/pull/47282
5874 [47300]: https://github.com/rust-lang/rust/pull/47300
5875 [47349]: https://github.com/rust-lang/rust/pull/47349
5876 [46931]: https://github.com/rust-lang/rust/pull/46931
5877 [46985]: https://github.com/rust-lang/rust/pull/46985
5878 [47006]: https://github.com/rust-lang/rust/pull/47006
5879 [46830]: https://github.com/rust-lang/rust/pull/46830
5880 [46095]: https://github.com/rust-lang/rust/pull/46095
5881 [46666]: https://github.com/rust-lang/rust/pull/46666
5882 [46196]: https://github.com/rust-lang/rust/pull/46196
5883 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5884 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5885 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5886 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5887 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5890 Version 1.24.1 (2018-03-01)
5891 ==========================
5893 - [Do not abort when unwinding through FFI][48251]
5894 - [Emit UTF-16 files for linker arguments on Windows][48318]
5895 - [Make the error index generator work again][48308]
5896 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5898 [48251]: https://github.com/rust-lang/rust/issues/48251
5899 [48308]: https://github.com/rust-lang/rust/issues/48308
5900 [48318]: https://github.com/rust-lang/rust/issues/48318
5901 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5904 Version 1.24.0 (2018-02-15)
5905 ==========================
5909 - [External `sysv64` ffi is now available.][46528]
5910 eg. `extern "sysv64" fn foo () {}`
5914 - [rustc now uses 16 codegen units by default for release builds.][46910]
5915 For the fastest builds, utilize `codegen-units=1`.
5916 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5917 - [Add `aarch64-unknown-openbsd` support][46760]
5921 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5922 improvement in performance in the majority of cases.
5923 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5924 with Windows.][46798]
5925 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5926 - [impl `From<bool>` for `AtomicBool`][46293]
5927 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5928 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5929 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5930 - [float::from_bits now just uses transmute.][46012] This provides
5931 some optimisations from LLVM.
5932 - [Copied `AsciiExt` methods onto `char`][46077]
5933 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5934 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5935 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5936 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5940 - [`RefCell::replace`]
5942 - [`atomic::spin_loop_hint`]
5944 The following functions can now be used in a constant expression.
5945 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5947 - [`AtomicBool::new`][46287]
5948 - [`AtomicUsize::new`][46287]
5949 - [`AtomicIsize::new`][46287]
5950 - [`AtomicPtr::new`][46287]
5951 - [`Cell::new`][46287]
5952 - [`{integer}::min_value`][46287]
5953 - [`{integer}::max_value`][46287]
5954 - [`mem::size_of`][46287]
5955 - [`mem::align_of`][46287]
5956 - [`ptr::null`][46287]
5957 - [`ptr::null_mut`][46287]
5958 - [`RefCell::new`][46287]
5959 - [`UnsafeCell::new`][46287]
5963 - [Added a `workspace.default-members` config that
5964 overrides implied `--all` in virtual workspaces.][cargo/4743]
5965 - [Enable incremental by default on development builds.][cargo/4817] Also added
5966 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5967 per-project or global basis respectively.
5974 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5975 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5976 in accordance with IETF RFC 4291 §2.2.
5977 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5978 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5979 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5980 - [Leading zeros in tuple struct members is now an error][47084]
5981 - [`column!()` macro is one-based instead of zero-based][46977]
5982 - [`fmt::Arguments` can no longer be shared across threads][45198]
5983 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5984 - [Cargo sets a different working directory for the compiler][cargo/4788]
5986 [44884]: https://github.com/rust-lang/rust/pull/44884
5987 [45198]: https://github.com/rust-lang/rust/pull/45198
5988 [45506]: https://github.com/rust-lang/rust/pull/45506
5989 [45990]: https://github.com/rust-lang/rust/pull/45990
5990 [46012]: https://github.com/rust-lang/rust/pull/46012
5991 [46077]: https://github.com/rust-lang/rust/pull/46077
5992 [46094]: https://github.com/rust-lang/rust/pull/46094
5993 [46284]: https://github.com/rust-lang/rust/pull/46284
5994 [46287]: https://github.com/rust-lang/rust/pull/46287
5995 [46293]: https://github.com/rust-lang/rust/pull/46293
5996 [46528]: https://github.com/rust-lang/rust/pull/46528
5997 [46671]: https://github.com/rust-lang/rust/pull/46671
5998 [46713]: https://github.com/rust-lang/rust/pull/46713
5999 [46735]: https://github.com/rust-lang/rust/pull/46735
6000 [46760]: https://github.com/rust-lang/rust/pull/46760
6001 [46798]: https://github.com/rust-lang/rust/pull/46798
6002 [46828]: https://github.com/rust-lang/rust/pull/46828
6003 [46831]: https://github.com/rust-lang/rust/pull/46831
6004 [46833]: https://github.com/rust-lang/rust/pull/46833
6005 [46910]: https://github.com/rust-lang/rust/pull/46910
6006 [46977]: https://github.com/rust-lang/rust/pull/46977
6007 [47018]: https://github.com/rust-lang/rust/pull/47018
6008 [47080]: https://github.com/rust-lang/rust/pull/47080
6009 [47084]: https://github.com/rust-lang/rust/pull/47084
6010 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6011 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6012 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6013 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6014 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6015 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6018 Version 1.23.0 (2018-01-04)
6019 ==========================
6023 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6024 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6025 Which should fix some confusing errors in some operations.
6029 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6030 undefined behavior.][45920]
6031 - [rustc now suggests renaming import if names clash.][45660]
6032 - [Display errors/warnings correctly when there are zero-width or
6033 wide characters.][45711]
6034 - [rustc now avoids unnecessary copies of arguments that are
6035 simple bindings][45380] This should improve memory usage on average by 5-10%.
6036 - [Updated musl used to build musl rustc to 1.1.17][45393]
6040 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6041 - [Implement Hash for raw pointers to unsized types][45483]
6042 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6043 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6044 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6045 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6046 and `<*mut T>::as_mut`][44932]
6047 - [Optimized `Thread::{park, unpark}` implementation][45524]
6048 - [Improved `SliceExt::binary_search` performance.][45333]
6049 - [impl `FromIterator<()>` for `()`][45379]
6050 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6058 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6059 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6060 - [Added unit test checking to `cargo check`][cargo/4592]
6061 - [Cargo now lets you install a specific version
6062 using `cargo install --version`][cargo/4637]
6066 - [Releases now ship with the Cargo book documentation.][45692]
6067 - [rustdoc now prints rendering warnings on every run.][45324]
6071 - [Changes have been made to type equality to make it more correct,
6072 in rare cases this could break some code.][45853] [Tracking issue for
6073 further information][45852]
6074 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6075 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6076 Android 9, the minimum supported version is Android 14.
6077 - [Bumped the minimum LLVM to 3.9][45326]
6079 [44042]: https://github.com/rust-lang/rust/pull/44042
6080 [44932]: https://github.com/rust-lang/rust/pull/44932
6081 [45267]: https://github.com/rust-lang/rust/pull/45267
6082 [45324]: https://github.com/rust-lang/rust/pull/45324
6083 [45326]: https://github.com/rust-lang/rust/pull/45326
6084 [45333]: https://github.com/rust-lang/rust/pull/45333
6085 [45379]: https://github.com/rust-lang/rust/pull/45379
6086 [45380]: https://github.com/rust-lang/rust/pull/45380
6087 [45393]: https://github.com/rust-lang/rust/pull/45393
6088 [45435]: https://github.com/rust-lang/rust/pull/45435
6089 [45483]: https://github.com/rust-lang/rust/pull/45483
6090 [45524]: https://github.com/rust-lang/rust/pull/45524
6091 [45571]: https://github.com/rust-lang/rust/pull/45571
6092 [45580]: https://github.com/rust-lang/rust/pull/45580
6093 [45610]: https://github.com/rust-lang/rust/pull/45610
6094 [45660]: https://github.com/rust-lang/rust/pull/45660
6095 [45692]: https://github.com/rust-lang/rust/pull/45692
6096 [45711]: https://github.com/rust-lang/rust/pull/45711
6097 [45772]: https://github.com/rust-lang/rust/pull/45772
6098 [45852]: https://github.com/rust-lang/rust/issues/45852
6099 [45853]: https://github.com/rust-lang/rust/pull/45853
6100 [45887]: https://github.com/rust-lang/rust/pull/45887
6101 [45920]: https://github.com/rust-lang/rust/pull/45920
6102 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6103 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6104 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6107 Version 1.22.1 (2017-11-22)
6108 ==========================
6110 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6112 [46183]: https://github.com/rust-lang/rust/pull/46183
6114 Version 1.22.0 (2017-11-22)
6115 ==========================
6119 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6120 - [Now accepts underscores in unicode escapes][43716]
6121 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6122 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6126 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6127 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6128 This should decrease compile times for debug builds.
6129 - [strict memory alignment now enabled on ARMv6][45094]
6130 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6134 - [Allow atomic operations up to 32 bits
6135 on `armv5te_unknown_linux_gnueabi`][44978]
6136 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6137 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6138 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6139 - [Properly detect overflow in `Instant += Duration`.][44220]
6140 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6141 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6142 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6149 - [Cargo will now build multi file examples in subdirectories of the `examples`
6150 folder that have a `main.rs` file.][cargo/4496]
6151 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6152 the old format will continue to work and can be updated with `cargo update`.
6153 - [Now supports vendoring git repositories][cargo/3992]
6157 - [`libbacktrace` is now available on Apple platforms.][44251]
6158 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6159 This now lets you specify that a given code example will fail to compile.
6163 - [The minimum Android version that rustc can build for has been bumped
6164 to `4.0` from `2.3`][45656]
6165 - [Allowing `T op= &T` for numeric types has broken some type
6166 inference cases][45480]
6169 [42526]: https://github.com/rust-lang/rust/pull/42526
6170 [43716]: https://github.com/rust-lang/rust/pull/43716
6171 [43949]: https://github.com/rust-lang/rust/pull/43949
6172 [44015]: https://github.com/rust-lang/rust/pull/44015
6173 [44220]: https://github.com/rust-lang/rust/pull/44220
6174 [44251]: https://github.com/rust-lang/rust/pull/44251
6175 [44287]: https://github.com/rust-lang/rust/pull/44287
6176 [44303]: https://github.com/rust-lang/rust/pull/44303
6177 [44456]: https://github.com/rust-lang/rust/pull/44456
6178 [44466]: https://github.com/rust-lang/rust/pull/44466
6179 [44895]: https://github.com/rust-lang/rust/pull/44895
6180 [44966]: https://github.com/rust-lang/rust/pull/44966
6181 [44978]: https://github.com/rust-lang/rust/pull/44978
6182 [45041]: https://github.com/rust-lang/rust/pull/45041
6183 [45064]: https://github.com/rust-lang/rust/pull/45064
6184 [45075]: https://github.com/rust-lang/rust/pull/45075
6185 [45094]: https://github.com/rust-lang/rust/pull/45094
6186 [45095]: https://github.com/rust-lang/rust/pull/45095
6187 [45480]: https://github.com/rust-lang/rust/issues/45480
6188 [45656]: https://github.com/rust-lang/rust/pull/45656
6189 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6190 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6191 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6198 Version 1.21.0 (2017-10-12)
6199 ==========================
6203 - [You can now use static references for literals.][43838]
6207 let x: &'static u32 = &0;
6210 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6213 my_macro!(Vec<i32>::new); // Always worked
6214 my_macro!(Vec::<i32>::new); // Now works
6219 - [Upgraded jemalloc to 4.5.0][43911]
6220 - [Enabled unwinding panics on Redox][43917]
6221 - [Now runs LLVM in parallel during translation phase.][43506]
6222 This should reduce peak memory usage.
6226 - [Generate builtin impls for `Clone` for all arrays and tuples that
6227 are `T: Clone`][43690]
6228 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6229 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6230 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6235 [`std::mem::discriminant`]
6239 - [You can now call `cargo install` with multiple package names][cargo/4216]
6240 - [Cargo commands inside a virtual workspace will now implicitly
6241 pass `--all`][cargo/4335]
6242 - [Added a `[patch]` section to `Cargo.toml` to handle
6243 prepublication dependencies][cargo/4123] [RFC 1969]
6244 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6245 like patterns][cargo/4270]
6246 - [Added the `--all-targets` option][cargo/4400]
6247 - [Using required dependencies as a feature is now deprecated and emits
6248 a warning][cargo/4364]
6253 - [Cargo docs are moving][43916]
6254 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6255 - [The rustdoc book is now available][43863]
6256 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6257 - [Added a preview of RLS has been made available through rustup][44204]
6258 Install with `rustup component add rls-preview`
6259 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6260 Previously only showed `std::os::unix`.
6264 - [Changes in method matching against higher-ranked types][43880] This may cause
6265 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6266 - [rustc's JSON error output's byte position start at top of file.][42973]
6267 Was previously relative to the rustc's internal `CodeMap` struct which
6268 required the unstable library `libsyntax` to correctly use.
6269 - [`unused_results` lint no longer ignores booleans][43728]
6271 [42565]: https://github.com/rust-lang/rust/pull/42565
6272 [42973]: https://github.com/rust-lang/rust/pull/42973
6273 [43348]: https://github.com/rust-lang/rust/pull/43348
6274 [43459]: https://github.com/rust-lang/rust/pull/43459
6275 [43506]: https://github.com/rust-lang/rust/pull/43506
6276 [43540]: https://github.com/rust-lang/rust/pull/43540
6277 [43690]: https://github.com/rust-lang/rust/pull/43690
6278 [43728]: https://github.com/rust-lang/rust/pull/43728
6279 [43838]: https://github.com/rust-lang/rust/pull/43838
6280 [43863]: https://github.com/rust-lang/rust/pull/43863
6281 [43880]: https://github.com/rust-lang/rust/pull/43880
6282 [43911]: https://github.com/rust-lang/rust/pull/43911
6283 [43916]: https://github.com/rust-lang/rust/pull/43916
6284 [43917]: https://github.com/rust-lang/rust/pull/43917
6285 [44204]: https://github.com/rust-lang/rust/pull/44204
6286 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6287 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6288 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6289 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6290 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6291 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6292 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6293 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6294 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6296 Version 1.20.0 (2017-08-31)
6297 ===========================
6301 - [Associated constants are now stabilised.][42809]
6302 - [A lot of macro bugs are now fixed.][42913]
6307 - [Struct fields are now properly coerced to the expected field type.][42807]
6308 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6309 `wasm32-experimental-emscripten` target.
6310 - [Changed some of the error messages to be more helpful.][42033]
6311 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6313 - [rustc now reports the total number of errors on compilation failure][43015]
6314 previously this was only the number of errors in the pass that failed.
6315 - [Expansion in rustc has been sped up 29x.][42533]
6316 - [added `msp430-none-elf` target.][43099]
6317 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6319 - [Fixes backtraces on Redox][43228]
6320 - [rustc now identifies different versions of same crate when absolute paths of
6321 different types match in an error message.][42826]
6327 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6328 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6330 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6331 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6332 - [Impl `Clone` for `DefaultHasher`.][42799]
6333 - [Impl `Sync` for `SyncSender`.][42397]
6334 - [Impl `FromStr` for `char`][42271]
6335 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6337 - [allow messages in the `unimplemented!()` macro.][42155]
6338 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6339 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6340 - [Upgrade to Unicode 10.0.0][42999]
6341 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6342 - [Skip the main thread's manual stack guard on Linux][43072]
6343 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6344 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6346 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6351 - [`CStr::into_c_string`]
6352 - [`CString::as_c_str`]
6353 - [`CString::into_boxed_c_str`]
6354 - [`Chain::get_mut`]
6355 - [`Chain::get_ref`]
6356 - [`Chain::into_inner`]
6357 - [`Option::get_or_insert_with`]
6358 - [`Option::get_or_insert`]
6359 - [`OsStr::into_os_string`]
6360 - [`OsString::into_boxed_os_str`]
6363 - [`Utf8Error::error_len`]
6364 - [`char::EscapeDebug`]
6365 - [`char::escape_debug`]
6366 - [`compile_error!`]
6367 - [`f32::from_bits`]
6369 - [`f64::from_bits`]
6371 - [`mem::ManuallyDrop`]
6372 - [`slice::sort_unstable_by_key`]
6373 - [`slice::sort_unstable_by`]
6374 - [`slice::sort_unstable`]
6375 - [`str::from_boxed_utf8_unchecked`]
6376 - [`str::as_bytes_mut`]
6377 - [`str::as_bytes_mut`]
6378 - [`str::from_utf8_mut`]
6379 - [`str::from_utf8_unchecked_mut`]
6381 - [`str::get_unchecked_mut`]
6382 - [`str::get_unchecked`]
6384 - [`str::into_boxed_bytes`]
6389 - [Cargo API token location moved from `~/.cargo/config` to
6390 `~/.cargo/credentials`.][cargo/3978]
6391 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6392 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6393 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6394 - [You can now specify version of a binary when installed through
6395 `cargo install` using `--vers`.][cargo/4229]
6396 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6397 failure.][cargo/4248]
6398 - [Changed the convention around which file is the crate root.][cargo/4259]
6403 - [Functions with `'static` in their return types will now not be as usable as
6404 if they were using lifetime parameters instead.][42417]
6405 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6406 takes the sign of NaN into account where previously didn't.][42430]
6408 [42033]: https://github.com/rust-lang/rust/pull/42033
6409 [42155]: https://github.com/rust-lang/rust/pull/42155
6410 [42271]: https://github.com/rust-lang/rust/pull/42271
6411 [42397]: https://github.com/rust-lang/rust/pull/42397
6412 [42417]: https://github.com/rust-lang/rust/pull/42417
6413 [42430]: https://github.com/rust-lang/rust/pull/42430
6414 [42431]: https://github.com/rust-lang/rust/pull/42431
6415 [42533]: https://github.com/rust-lang/rust/pull/42533
6416 [42571]: https://github.com/rust-lang/rust/pull/42571
6417 [42613]: https://github.com/rust-lang/rust/pull/42613
6418 [42799]: https://github.com/rust-lang/rust/pull/42799
6419 [42807]: https://github.com/rust-lang/rust/pull/42807
6420 [42809]: https://github.com/rust-lang/rust/pull/42809
6421 [42822]: https://github.com/rust-lang/rust/pull/42822
6422 [42826]: https://github.com/rust-lang/rust/pull/42826
6423 [42854]: https://github.com/rust-lang/rust/pull/42854
6424 [42913]: https://github.com/rust-lang/rust/pull/42913
6425 [42999]: https://github.com/rust-lang/rust/pull/42999
6426 [43011]: https://github.com/rust-lang/rust/pull/43011
6427 [43015]: https://github.com/rust-lang/rust/pull/43015
6428 [43072]: https://github.com/rust-lang/rust/pull/43072
6429 [43077]: https://github.com/rust-lang/rust/pull/43077
6430 [43097]: https://github.com/rust-lang/rust/pull/43097
6431 [43099]: https://github.com/rust-lang/rust/pull/43099
6432 [43170]: https://github.com/rust-lang/rust/pull/43170
6433 [43178]: https://github.com/rust-lang/rust/pull/43178
6434 [43185]: https://github.com/rust-lang/rust/pull/43185
6435 [43228]: https://github.com/rust-lang/rust/pull/43228
6436 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6437 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6438 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6439 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6440 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6441 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6442 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6443 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6444 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6445 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6446 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6447 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6448 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6449 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6450 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6451 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6452 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6453 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6454 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6455 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6456 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6457 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6458 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6459 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6460 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6461 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6462 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6463 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6464 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6465 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6466 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6467 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6468 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6469 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6470 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6471 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6472 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6473 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6476 Version 1.19.0 (2017-07-20)
6477 ===========================
6482 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6483 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6484 - [Macro recursion limit increased to 1024 from 64.][41676]
6485 - [Added lint for detecting unused macros.][41907]
6486 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6487 For example: `let x = loop { break 7; };`
6488 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6489 contain `Copy` types and cannot have a `Drop` implementation.
6490 Example: `union Foo { bar: u8, baz: usize }`
6491 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6492 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6497 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6498 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6499 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6500 you should use `--target armv7-linux-androideabi`.
6501 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6502 - [Minor optimisation of string operations.][42037]
6503 - [Compiler error message is now `aborting due to previous error(s)` instead of
6504 `aborting due to N previous errors`][42150] This was previously inaccurate and
6505 would only count certain kinds of errors.
6506 - [The compiler now supports Visual Studio 2017][42225]
6507 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6508 - [Added a lot][42264] of [new error codes][42302]
6509 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6510 libraries with C Run-time Libraries(CRT) to be statically linked.
6511 - [Fixed various ARM codegen bugs][42740]
6516 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6517 `Extend<Cow<'a, str>>`][41449]
6518 - [`Vec` now implements `From<&mut [T]>`][41530]
6519 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6520 - [`SplitWhitespace` now implements `Clone`][41659]
6521 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6523 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6524 macros, but for printing to stderr.
6529 - [`OsString::shrink_to_fit`]
6532 - [`thread::ThreadId`]
6537 - [Build scripts can now add environment variables to the environment
6538 the crate is being compiled in.
6539 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6540 - [Subcommands now replace the current process rather than spawning a new
6541 child process][cargo/3970]
6542 - [Workspace members can now accept glob file patterns][cargo/3979]
6543 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6544 the members in a given workspace.][cargo/3988]
6545 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6546 - [Target directory path is now in the cargo metadata][cargo/4022]
6547 - [Cargo no longer checks out a local working directory for the
6548 crates.io index][cargo/4026] This should provide smaller file size for the
6549 registry, and improve cloning times, especially on Windows machines.
6550 - [Added an `--exclude` option for excluding certain packages when using the
6551 `--all` option][cargo/4031]
6552 - [Cargo will now automatically retry when receiving a 5xx error
6553 from crates.io][cargo/4032]
6554 - [The `--features` option now accepts multiple comma or space
6555 delimited values.][cargo/4084]
6556 - [Added support for custom target specific runners][cargo/3954]
6561 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6563 - [Rust will now release XZ compressed packages][rust-installer/57]
6564 - [rustup will now prefer to download rust packages with
6565 XZ compression][rustup/1100] over GZip packages.
6566 - [Added the ability to escape `#` in rust documentation][41785] By adding
6567 additional `#`'s ie. `##` is now `#`
6572 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6573 - [`-Z` flags are now no longer allowed to be used on the stable
6574 compiler.][41751] This has been a warning for a year previous to this.
6575 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6576 longer works][42844]. Users should migrate to the built-in `check`
6577 command, which has been available since 1.16.
6578 - [Ending a float literal with `._` is now a hard error.
6579 Example: `42._` .][41946]
6580 - [Any use of a private `extern crate` outside of its module is now a
6581 hard error.][36886] This was previously a warning.
6582 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6583 relative while the `::` prefix makes a path absolute, but was ignored and the
6584 path was relative regardless.
6585 - [Floating point constants in match patterns is now a hard error][36890]
6586 This was previously a warning.
6587 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6588 match patterns is now a hard error][36891] This was previously a warning.
6589 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6591 - [From the pound escape, lines consisting of multiple `#`s are
6593 - [It is an error to re-export private enum variants][42460]. This is
6594 known to break a number of crates that depend on an older version of
6596 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6597 to use it to find the linker, and the build will fail where it did
6598 not previously][42607]
6600 [36886]: https://github.com/rust-lang/rust/issues/36886
6601 [36888]: https://github.com/rust-lang/rust/issues/36888
6602 [36890]: https://github.com/rust-lang/rust/issues/36890
6603 [36891]: https://github.com/rust-lang/rust/issues/36891
6604 [36892]: https://github.com/rust-lang/rust/issues/36892
6605 [37406]: https://github.com/rust-lang/rust/issues/37406
6606 [39983]: https://github.com/rust-lang/rust/pull/39983
6607 [41145]: https://github.com/rust-lang/rust/pull/41145
6608 [41192]: https://github.com/rust-lang/rust/pull/41192
6609 [41258]: https://github.com/rust-lang/rust/pull/41258
6610 [41370]: https://github.com/rust-lang/rust/pull/41370
6611 [41449]: https://github.com/rust-lang/rust/pull/41449
6612 [41530]: https://github.com/rust-lang/rust/pull/41530
6613 [41624]: https://github.com/rust-lang/rust/pull/41624
6614 [41656]: https://github.com/rust-lang/rust/pull/41656
6615 [41659]: https://github.com/rust-lang/rust/pull/41659
6616 [41676]: https://github.com/rust-lang/rust/pull/41676
6617 [41751]: https://github.com/rust-lang/rust/pull/41751
6618 [41764]: https://github.com/rust-lang/rust/pull/41764
6619 [41785]: https://github.com/rust-lang/rust/pull/41785
6620 [41873]: https://github.com/rust-lang/rust/pull/41873
6621 [41907]: https://github.com/rust-lang/rust/pull/41907
6622 [41946]: https://github.com/rust-lang/rust/pull/41946
6623 [42016]: https://github.com/rust-lang/rust/pull/42016
6624 [42037]: https://github.com/rust-lang/rust/pull/42037
6625 [42068]: https://github.com/rust-lang/rust/pull/42068
6626 [42150]: https://github.com/rust-lang/rust/pull/42150
6627 [42162]: https://github.com/rust-lang/rust/pull/42162
6628 [42225]: https://github.com/rust-lang/rust/pull/42225
6629 [42264]: https://github.com/rust-lang/rust/pull/42264
6630 [42302]: https://github.com/rust-lang/rust/pull/42302
6631 [42460]: https://github.com/rust-lang/rust/issues/42460
6632 [42607]: https://github.com/rust-lang/rust/issues/42607
6633 [42740]: https://github.com/rust-lang/rust/pull/42740
6634 [42844]: https://github.com/rust-lang/rust/issues/42844
6635 [42948]: https://github.com/rust-lang/rust/pull/42948
6636 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6637 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6638 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6639 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6640 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6641 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6642 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6643 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6644 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6645 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6646 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6647 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6648 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6649 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6650 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6651 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6652 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6653 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6654 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6655 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6656 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6657 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6660 Version 1.18.0 (2017-06-08)
6661 ===========================
6666 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6667 make the item visible to just that module tree. Also accepts the keyword
6668 `crate` to make something public to the whole crate but not users of the
6669 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6670 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6671 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6672 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6673 types like `Write + Send`, trailing `+` are now supported in trait objects,
6674 and better error reporting for trait objects starting with `?Sized`.
6675 - [0e+10 is now a valid floating point literal][40589]
6676 - [Now warns if you bind a lifetime parameter to 'static][40734]
6677 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6678 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6679 representation in some cases.][40377]
6684 - [rustc can now emit mir with `--emit mir`][39891]
6685 - [Improved LLVM IR for trivial functions][40367]
6686 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6687 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6688 opportunities found through profiling
6689 - [Improved backtrace formatting when panicking][38165]
6694 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6695 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6696 iteration or reallocation.
6697 - [Simplified HashMap Bucket interface][40561] provides performance
6698 improvements for iterating and cloning.
6699 - [Specialize Vec::from_elem to use calloc][40409]
6700 - [Fixed Race condition in fs::create_dir_all][39799]
6701 - [No longer caching stdio on Windows][40516]
6702 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6703 2.50%~ faster and in one case now 12.50% faster.
6704 - [Optimized `AtomicBool::fetch_nand`][41143]
6709 - [`Child::try_wait`]
6710 - [`HashMap::retain`]
6711 - [`HashSet::retain`]
6713 - [`TcpStream::peek`]
6714 - [`UdpSocket::peek`]
6715 - [`UdpSocket::peek_from`]
6720 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6721 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6722 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6723 - [Added Android build support][cargo/3885]
6724 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6725 of a certain type, for example `cargo build --bins` will build all
6727 - [Added support for haiku][cargo/3952]
6732 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6733 - [Rust now uses the official cross compiler for NetBSD][40612]
6734 - [rustdoc now accepts `#` at the start of files][40828]
6735 - [Fixed jemalloc support for musl][41168]
6740 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6741 always placed after the sign if it exists and before the digits. With the `#`
6742 flag the zeroes are placed after the prefix and before the digits.
6743 - [Due to the struct field optimisation][40377], using `transmute` on structs
6744 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6745 always been undefined behavior, but is now more likely to break in practice.
6746 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6747 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6748 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6749 - [Overlapping inherent `impl`s are now a hard error][40728]
6750 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6751 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6752 `out.asm` and `out.ll` instead of only one of the filetypes.
6753 - [ calling a function that returns `Self` will no longer work][41805] when
6754 the size of `Self` cannot be statically determined.
6755 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6756 this has caused a few regressions namely:
6758 - Changed the link order of local static/dynamic libraries (respecting the
6759 order on given rather than having the compiler reorder).
6760 - Changed how MinGW is linked, native code linked to dynamic libraries
6761 may require manually linking to the gcc support library (for the native
6764 [38165]: https://github.com/rust-lang/rust/pull/38165
6765 [39799]: https://github.com/rust-lang/rust/pull/39799
6766 [39891]: https://github.com/rust-lang/rust/pull/39891
6767 [40043]: https://github.com/rust-lang/rust/pull/40043
6768 [40241]: https://github.com/rust-lang/rust/pull/40241
6769 [40338]: https://github.com/rust-lang/rust/pull/40338
6770 [40367]: https://github.com/rust-lang/rust/pull/40367
6771 [40377]: https://github.com/rust-lang/rust/pull/40377
6772 [40409]: https://github.com/rust-lang/rust/pull/40409
6773 [40516]: https://github.com/rust-lang/rust/pull/40516
6774 [40556]: https://github.com/rust-lang/rust/pull/40556
6775 [40561]: https://github.com/rust-lang/rust/pull/40561
6776 [40589]: https://github.com/rust-lang/rust/pull/40589
6777 [40612]: https://github.com/rust-lang/rust/pull/40612
6778 [40723]: https://github.com/rust-lang/rust/pull/40723
6779 [40728]: https://github.com/rust-lang/rust/pull/40728
6780 [40731]: https://github.com/rust-lang/rust/pull/40731
6781 [40734]: https://github.com/rust-lang/rust/pull/40734
6782 [40805]: https://github.com/rust-lang/rust/pull/40805
6783 [40807]: https://github.com/rust-lang/rust/pull/40807
6784 [40828]: https://github.com/rust-lang/rust/pull/40828
6785 [40870]: https://github.com/rust-lang/rust/pull/40870
6786 [41085]: https://github.com/rust-lang/rust/pull/41085
6787 [41143]: https://github.com/rust-lang/rust/pull/41143
6788 [41168]: https://github.com/rust-lang/rust/pull/41168
6789 [41270]: https://github.com/rust-lang/rust/issues/41270
6790 [41469]: https://github.com/rust-lang/rust/pull/41469
6791 [41805]: https://github.com/rust-lang/rust/issues/41805
6792 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6793 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6794 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6795 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6796 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6797 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6798 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6799 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6800 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6801 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6802 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6803 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6804 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6805 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6808 Version 1.17.0 (2017-04-27)
6809 ===========================
6814 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6815 * [Fields of structs may be initialized without duplicating the field/variable
6816 names][39761]. [RFC 1682]
6817 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6818 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6819 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6820 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6821 `'b`. Soundness fix.
6822 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6823 * [Static variables may contain references to other statics][40027]
6828 * [Exit quickly on only `--emit dep-info`][40336]
6829 * [Make `-C relocation-model` more correctly determine whether the linker
6830 creates a position-independent executable][40245]
6831 * [Add `-C overflow-checks` to directly control whether integer overflow
6833 * [The rustc type checker now checks items on demand instead of in a single
6834 in-order pass][40008]. This is mostly an internal refactoring in support of
6835 future work, including incremental type checking, but also resolves [RFC
6836 1647], allowing `Self` to appear in `impl` `where` clauses.
6837 * [Optimize vtable loads][39995]
6838 * [Turn off vectorization for Emscripten targets][39990]
6839 * [Provide suggestions for unknown macros imported with `use`][39953]
6840 * [Fix ICEs in path resolution][39939]
6841 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6842 * [Add clearer error message using `&str + &str`][39116]
6853 * [`Ordering::then`]
6854 * [`Ordering::then_with`]
6855 * [`BTreeMap::range`]
6856 * [`BTreeMap::range_mut`]
6857 * [`collections::Bound`]
6858 * [`process::abort`]
6859 * [`ptr::read_unaligned`]
6860 * [`ptr::write_unaligned`]
6861 * [`Result::expect_err`]
6864 * [`Cell::into_inner`]
6870 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6871 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6872 * [`String` implements `FromIterator<&char>`][40028]
6873 * `Box` [implements][40009] a number of new conversions:
6874 `From<Box<str>> for String`,
6875 `From<Box<[T]>> for Vec<T>`,
6876 `From<Box<CStr>> for CString`,
6877 `From<Box<OsStr>> for OsString`,
6878 `From<Box<Path>> for PathBuf`,
6879 `Into<Box<str>> for String`,
6880 `Into<Box<[T]>> for Vec<T>`,
6881 `Into<Box<CStr>> for CString`,
6882 `Into<Box<OsStr>> for OsString`,
6883 `Into<Box<Path>> for PathBuf`,
6884 `Default for Box<str>`,
6885 `Default for Box<CStr>`,
6886 `Default for Box<OsStr>`,
6887 `From<&CStr> for Box<CStr>`,
6888 `From<&OsStr> for Box<OsStr>`,
6889 `From<&Path> for Box<Path>`
6890 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6891 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6892 * [Slightly optimize `slice::sort`][39538]
6893 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6894 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6895 `Box<str>` implements `From<&str>`][39438]
6896 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6897 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6898 * [`format!` estimates the needed capacity before writing a string][39356]
6899 * [Support unprivileged symlink creation in Windows][38921]
6900 * [`PathBuf` implements `Default`][38764]
6901 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6902 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6903 and poor hash functions.
6908 * [Add `cargo check --all`][cargo/3731]
6909 * [Add an option to ignore SSL revocation checking][cargo/3699]
6910 * [Add `cargo run --package`][cargo/3691]
6911 * [Add `required_features`][cargo/3667]
6912 * [Assume `build.rs` is a build script][cargo/3664]
6913 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6918 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6920 * [The "Unstable Book" documents nightly-only features][ubook]
6921 * [Improve the style of the sidebar in rustdoc output][40265]
6922 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6923 * [Fix MSP430 breakage due to `i128`][40257]
6924 * [Preliminary Solaris/SPARCv9 support][39903]
6925 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6926 run without installing the MSVC runtime.
6927 * [`rustdoc --test` includes file names in test names][39788]
6928 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6929 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6930 * [Initial support for `aarch64-unknown-freebsd`][39491]
6931 * [Initial support for `i686-unknown-netbsd`][39426]
6932 * [This release no longer includes the old makefile build system][39431]. Rust
6933 is built with a custom build system, written in Rust, and with Cargo.
6934 * [Add Debug implementations for libcollection structs][39002]
6935 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6936 * [`--test-threads=0` produces an error][38945]
6937 * [`rustup` installs documentation by default][40526]
6938 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6939 WinDbg and Visual Studio to improve the debugging experience.
6944 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6945 workaround, either use MSVC 2015 or run vcvars.bat.
6946 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6947 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6948 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6950 * [`format!` and `Display::to_string` panic if an underlying formatting
6951 implementation returns an error][40117]. Previously the error was silently
6952 ignored. It is incorrect for `write_fmt` to return an error when writing
6954 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6955 crates were marked stable and could be accessed from the stable toolchain.
6956 * [Rust git source no longer includes vendored crates][39728]. Those that need
6957 to build with vendored crates should build from release tarballs.
6958 * [Fix inert attributes from `proc_macro_derives`][39572]
6959 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6960 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6962 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6963 existing code generally ignores the type of dead-code unless a type-hint is
6964 provided; this can cause surprising inference interactions particularly around
6965 defaulting. The new code uniformly ignores the result type of dead-code.
6966 * [Tuple-struct constructors with private fields are no longer visible][38932]
6967 * [Lifetime parameters that do not appear in the arguments are now considered
6968 early-bound][38897], resolving a soundness bug (#[32330]). The
6969 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6971 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6972 * [Make transmuting from fn item types to pointer-sized types a hard
6975 [27787]: https://github.com/rust-lang/rust/issues/27787
6976 [32330]: https://github.com/rust-lang/rust/issues/32330
6977 [34198]: https://github.com/rust-lang/rust/pull/34198
6978 [38161]: https://github.com/rust-lang/rust/pull/38161
6979 [38368]: https://github.com/rust-lang/rust/pull/38368
6980 [38584]: https://github.com/rust-lang/rust/issues/38584
6981 [38661]: https://github.com/rust-lang/rust/pull/38661
6982 [38764]: https://github.com/rust-lang/rust/pull/38764
6983 [38864]: https://github.com/rust-lang/rust/issues/38864
6984 [38897]: https://github.com/rust-lang/rust/pull/38897
6985 [38921]: https://github.com/rust-lang/rust/pull/38921
6986 [38932]: https://github.com/rust-lang/rust/pull/38932
6987 [38945]: https://github.com/rust-lang/rust/pull/38945
6988 [38981]: https://github.com/rust-lang/rust/pull/38981
6989 [39002]: https://github.com/rust-lang/rust/pull/39002
6990 [39116]: https://github.com/rust-lang/rust/pull/39116
6991 [39193]: https://github.com/rust-lang/rust/pull/39193
6992 [39265]: https://github.com/rust-lang/rust/pull/39265
6993 [39356]: https://github.com/rust-lang/rust/pull/39356
6994 [39372]: https://github.com/rust-lang/rust/pull/39372
6995 [39426]: https://github.com/rust-lang/rust/pull/39426
6996 [39431]: https://github.com/rust-lang/rust/pull/39431
6997 [39438]: https://github.com/rust-lang/rust/pull/39438
6998 [39440]: https://github.com/rust-lang/rust/pull/39440
6999 [39485]: https://github.com/rust-lang/rust/pull/39485
7000 [39491]: https://github.com/rust-lang/rust/pull/39491
7001 [39518]: https://github.com/rust-lang/rust/pull/39518
7002 [39538]: https://github.com/rust-lang/rust/pull/39538
7003 [39572]: https://github.com/rust-lang/rust/pull/39572
7004 [39633]: https://github.com/rust-lang/rust/pull/39633
7005 [39642]: https://github.com/rust-lang/rust/pull/39642
7006 [39728]: https://github.com/rust-lang/rust/pull/39728
7007 [39761]: https://github.com/rust-lang/rust/pull/39761
7008 [39788]: https://github.com/rust-lang/rust/pull/39788
7009 [39793]: https://github.com/rust-lang/rust/pull/39793
7010 [39837]: https://github.com/rust-lang/rust/pull/39837
7011 [39843]: https://github.com/rust-lang/rust/pull/39843
7012 [39851]: https://github.com/rust-lang/rust/pull/39851
7013 [39903]: https://github.com/rust-lang/rust/pull/39903
7014 [39939]: https://github.com/rust-lang/rust/pull/39939
7015 [39953]: https://github.com/rust-lang/rust/pull/39953
7016 [39960]: https://github.com/rust-lang/rust/pull/39960
7017 [39990]: https://github.com/rust-lang/rust/pull/39990
7018 [39995]: https://github.com/rust-lang/rust/pull/39995
7019 [40008]: https://github.com/rust-lang/rust/pull/40008
7020 [40009]: https://github.com/rust-lang/rust/pull/40009
7021 [40027]: https://github.com/rust-lang/rust/pull/40027
7022 [40028]: https://github.com/rust-lang/rust/pull/40028
7023 [40037]: https://github.com/rust-lang/rust/pull/40037
7024 [40117]: https://github.com/rust-lang/rust/pull/40117
7025 [40166]: https://github.com/rust-lang/rust/pull/40166
7026 [40245]: https://github.com/rust-lang/rust/pull/40245
7027 [40257]: https://github.com/rust-lang/rust/pull/40257
7028 [40261]: https://github.com/rust-lang/rust/pull/40261
7029 [40265]: https://github.com/rust-lang/rust/pull/40265
7030 [40319]: https://github.com/rust-lang/rust/pull/40319
7031 [40336]: https://github.com/rust-lang/rust/pull/40336
7032 [40526]: https://github.com/rust-lang/rust/pull/40526
7033 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7034 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7035 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7036 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7037 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7038 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7039 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7040 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7041 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7042 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7043 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7044 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7045 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7046 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7047 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7048 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7049 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7050 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7051 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7052 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7053 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7054 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7055 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7056 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7057 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7058 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7059 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7060 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7061 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7062 [ubook]: https://doc.rust-lang.org/unstable-book/
7065 Version 1.16.0 (2017-03-16)
7066 ===========================
7071 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7072 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7073 match patterns][38069]
7074 * [Clean up semantics of `self` in an import list][38313]
7075 * [`Self` may appear in `impl` headers][38920]
7076 * [`Self` may appear in struct expressions][39282]
7081 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7082 a `.rmeta` file containing only crate metadata][38571]. This can be
7083 used by tools like the Rust Language Service to perform
7084 metadata-only builds.
7085 * [Levenshtein based typo suggestions now work in most places, while
7086 previously they worked only for fields and sometimes for local
7087 variables][38927]. Together with the overhaul of "no
7088 resolution"/"unexpected resolution" errors (#[38154]) they result in
7089 large and systematic improvement in resolution diagnostics.
7090 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7092 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7093 * [`rustc` no longer attempts to provide "consider using an explicit
7094 lifetime" suggestions][37057]. They were inaccurate.
7099 * [`VecDeque::truncate`]
7100 * [`VecDeque::resize`]
7101 * [`String::insert_str`]
7102 * [`Duration::checked_add`]
7103 * [`Duration::checked_sub`]
7104 * [`Duration::checked_div`]
7105 * [`Duration::checked_mul`]
7108 * [`SocketAddr::is_ipv4`]
7109 * [`SocketAddr::is_ipv6`]
7110 * [`IpAddr::is_ipv4`]
7111 * [`IpAddr::is_ipv6`]
7113 * [`Vec::dedup_by_key`]
7114 * [`Result::unwrap_or_default`]
7115 * [`<*const T>::wrapping_offset`]
7116 * [`<*mut T>::wrapping_offset`]
7117 * `CommandExt::creation_flags`
7118 * [`File::set_permissions`]
7119 * [`String::split_off`]
7124 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7125 their argument by `Borrow` parameter][37761]
7126 * [All public types in std implement `Debug`][38006]
7127 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7128 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7129 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7131 * [std: Fix partial writes in `LineWriter`][38062]
7132 * [std: Clamp max read/write sizes on Unix][38622]
7133 * [Use more specific panic message for `&str` slicing errors][38066]
7134 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7135 functionality cannot be achieved in std currently.
7136 * [`writeln!`, like `println!`, now accepts a form with no string
7137 or formatting arguments, to just print a newline][38469]
7138 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7139 * [Reduce the size of static data in `std_unicode::tables`][38781]
7140 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7141 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7143 * [`Duration` implements `Sum`][38712]
7144 * [`String` implements `ToSocketAddrs`][39048]
7149 * [The `cargo check` command does a type check of a project without
7150 building it][cargo/3296]
7151 * [crates.io will display CI badges from Travis and AppVeyor, if
7152 specified in Cargo.toml][cargo/3546]
7153 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7154 * [Compilation profiles accept integer values for `debug`, in addition
7155 to `true` and `false`. These are passed to `rustc` as the value to
7156 `-C debuginfo`][cargo/3534]
7157 * [Implement `cargo --version --verbose`][cargo/3604]
7158 * [All builds now output 'dep-info' build dependencies compatible with
7159 make and ninja][cargo/3557]
7160 * [Build all workspace members with `build --all`][cargo/3511]
7161 * [Document all workspace members with `doc --all`][cargo/3515]
7162 * [Path deps outside workspace are not members][cargo/3443]
7167 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7168 the path to the Rust implementation][38589]
7169 * [The `armv7-linux-androideabi` target no longer enables NEON
7170 extensions, per Google's ABI guide][38413]
7171 * [The stock standard library can be compiled for Redox OS][38401]
7172 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7174 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7176 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7181 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7182 match patterns][38069]
7183 * In this release, references to uninhabited types can not be
7184 pattern-matched. This was accidentally allowed in 1.15.
7185 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7186 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7188 * [Clean up semantics of `self` in an import list][38313]
7189 * Reimplemented lifetime elision. This change was almost entirely compatible
7190 with existing code, but it did close a number of small bugs and loopholes,
7191 as well as being more accepting in some other [cases][41105].
7193 [37057]: https://github.com/rust-lang/rust/pull/37057
7194 [37761]: https://github.com/rust-lang/rust/pull/37761
7195 [38006]: https://github.com/rust-lang/rust/pull/38006
7196 [38051]: https://github.com/rust-lang/rust/pull/38051
7197 [38062]: https://github.com/rust-lang/rust/pull/38062
7198 [38622]: https://github.com/rust-lang/rust/pull/38622
7199 [38066]: https://github.com/rust-lang/rust/pull/38066
7200 [38069]: https://github.com/rust-lang/rust/pull/38069
7201 [38131]: https://github.com/rust-lang/rust/pull/38131
7202 [38154]: https://github.com/rust-lang/rust/pull/38154
7203 [38274]: https://github.com/rust-lang/rust/pull/38274
7204 [38304]: https://github.com/rust-lang/rust/pull/38304
7205 [38313]: https://github.com/rust-lang/rust/pull/38313
7206 [38327]: https://github.com/rust-lang/rust/pull/38327
7207 [38401]: https://github.com/rust-lang/rust/pull/38401
7208 [38413]: https://github.com/rust-lang/rust/pull/38413
7209 [38469]: https://github.com/rust-lang/rust/pull/38469
7210 [38559]: https://github.com/rust-lang/rust/pull/38559
7211 [38571]: https://github.com/rust-lang/rust/pull/38571
7212 [38580]: https://github.com/rust-lang/rust/pull/38580
7213 [38589]: https://github.com/rust-lang/rust/pull/38589
7214 [38670]: https://github.com/rust-lang/rust/pull/38670
7215 [38712]: https://github.com/rust-lang/rust/pull/38712
7216 [38726]: https://github.com/rust-lang/rust/pull/38726
7217 [38781]: https://github.com/rust-lang/rust/pull/38781
7218 [38798]: https://github.com/rust-lang/rust/pull/38798
7219 [38909]: https://github.com/rust-lang/rust/pull/38909
7220 [38920]: https://github.com/rust-lang/rust/pull/38920
7221 [38927]: https://github.com/rust-lang/rust/pull/38927
7222 [39048]: https://github.com/rust-lang/rust/pull/39048
7223 [39282]: https://github.com/rust-lang/rust/pull/39282
7224 [39379]: https://github.com/rust-lang/rust/pull/39379
7225 [41105]: https://github.com/rust-lang/rust/issues/41105
7226 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7227 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7228 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7229 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7230 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7231 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7232 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7233 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7234 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7235 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7236 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7237 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7238 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7239 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7240 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7241 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7242 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7243 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7244 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7245 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7246 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7247 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7248 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7249 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7250 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7251 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7252 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7253 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7254 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7257 Version 1.15.1 (2017-02-09)
7258 ===========================
7260 * [Fix IntoIter::as_mut_slice's signature][39466]
7261 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7263 [39466]: https://github.com/rust-lang/rust/pull/39466
7264 [39523]: https://github.com/rust-lang/rust/pull/39523
7267 Version 1.15.0 (2017-02-02)
7268 ===========================
7273 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7274 stable. This allows popular code-generating crates like Serde and Diesel to
7275 work ergonomically. [RFC 1681].
7276 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7277 with curly braces][36868]. Part of [RFC 1506].
7278 * [A number of minor changes to name resolution have been activated][37127].
7279 They add up to more consistent semantics, allowing for future evolution of
7280 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7281 details of what is different. The breaking changes here have been transitioned
7282 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7283 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7285 * [`?Sized` can be used in `where` clauses][37791]
7286 * [There is now a limit on the size of monomorphized types and it can be
7287 modified with the `#![type_size_limit]` crate attribute, similarly to
7288 the `#![recursion_limit]` attribute][37789]
7293 * [On Windows, the compiler will apply dllimport attributes when linking to
7294 extern functions][37973]. Additional attributes and flags can control which
7295 library kind is linked and its name. [RFC 1717].
7296 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7297 * [The `--test` flag works with procedural macro crates][38107]
7298 * [Fix `extern "aapcs" fn` ABI][37814]
7299 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7300 * [The `format!` expander recognizes incorrect `printf` and shell-style
7301 formatting directives and suggests the correct format][37613].
7302 * [Only report one error for all unused imports in an import list][37456]
7304 Compiler Performance
7305 --------------------
7307 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7308 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7309 * [Don't clone in `UnificationTable::probe`][37848]
7310 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7311 * [Use small vectors in type walker][37760]
7312 * [Macro expansion performance was improved][37701]
7313 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7314 * [Replace FNV with a faster hash function][37229]
7319 * [`std::iter::Iterator::min_by`]
7320 * [`std::iter::Iterator::max_by`]
7321 * [`std::os::*::fs::FileExt`]
7322 * [`std::sync::atomic::Atomic*::get_mut`]
7323 * [`std::sync::atomic::Atomic*::into_inner`]
7324 * [`std::vec::IntoIter::as_slice`]
7325 * [`std::vec::IntoIter::as_mut_slice`]
7326 * [`std::sync::mpsc::Receiver::try_iter`]
7327 * [`std::os::unix::process::CommandExt::before_exec`]
7328 * [`std::rc::Rc::strong_count`]
7329 * [`std::rc::Rc::weak_count`]
7330 * [`std::sync::Arc::strong_count`]
7331 * [`std::sync::Arc::weak_count`]
7332 * [`std::char::encode_utf8`]
7333 * [`std::char::encode_utf16`]
7334 * [`std::cell::Ref::clone`]
7335 * [`std::io::Take::into_inner`]
7340 * [The standard sorting algorithm has been rewritten for dramatic performance
7341 improvements][38192]. It is a hybrid merge sort, drawing influences from
7342 Timsort. Previously it was a naive merge sort.
7343 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7344 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7346 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7347 and `char_indices().last()`][37882]
7348 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7349 * [Chinese characters display correctly in `fmt::Debug`][37855]
7350 * [Derive `Default` for `Duration`][37699]
7351 * [Support creation of anonymous pipes on WinXP/2k][37677]
7352 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7353 * [Don't pass overlapped handles to processes][38835]
7358 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7359 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7360 should instead check the variable at runtime with `std::env`. That the value
7361 was set at build time was a bug, and incorrect when cross-compiling. This
7362 change is known to cause breakage.
7363 * [Add `--all` flag to `cargo test`][cargo/3221]
7364 * [Compile statically against the MSVC CRT][cargo/3363]
7365 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7366 * [Link OpenSSL statically on OSX][cargo/3311]
7367 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7368 * [Test for bad path overrides with summaries][cargo/3336]
7369 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7370 * [Fix retrying crate downloads for network errors][cargo/3348]
7371 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7372 * [Emit more info on --message-format=json][cargo/3319]
7373 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7374 * [Don't ignore errors in workspace manifest][cargo/3409]
7375 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7380 * [Test runners (binaries built with `--test`) now support a `--list` argument
7381 that lists the tests it contains][38185]
7382 * [Test runners now support a `--exact` argument that makes the test filter
7383 match exactly, instead of matching only a substring of the test name][38181]
7384 * [rustdoc supports a `--playground-url` flag][37763]
7385 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7390 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7391 continue to be used in this release by passing `--disable-rustbuild` to the
7392 configure script, but they will be deleted soon. Note that the new build
7393 system uses a different on-disk layout that will likely affect any scripts
7395 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7397 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7398 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7404 * [A number of minor changes to name resolution have been activated][37127].
7405 They add up to more consistent semantics, allowing for future evolution of
7406 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7407 details of what is different. The breaking changes here have been transitioned
7408 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7409 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7410 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7411 should instead check the variable at runtime with `std::env`. That the value
7412 was set at build time was a bug, and incorrect when cross-compiling. This
7413 change is known to cause breakage.
7414 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7415 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7416 1.10 and is now an error by default. It will become a hard error in the near
7418 * [The semantics relating modules to file system directories are changing in
7419 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7420 lint, which is a warning in this release, and will become a hard error in the
7422 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7423 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7424 the underlying iterator][37834]
7426 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7427 [33685]: https://github.com/rust-lang/rust/issues/33685
7428 [36868]: https://github.com/rust-lang/rust/pull/36868
7429 [37127]: https://github.com/rust-lang/rust/pull/37127
7430 [37229]: https://github.com/rust-lang/rust/pull/37229
7431 [37456]: https://github.com/rust-lang/rust/pull/37456
7432 [37527]: https://github.com/rust-lang/rust/pull/37527
7433 [37602]: https://github.com/rust-lang/rust/pull/37602
7434 [37613]: https://github.com/rust-lang/rust/pull/37613
7435 [37615]: https://github.com/rust-lang/rust/pull/37615
7436 [37636]: https://github.com/rust-lang/rust/pull/37636
7437 [37627]: https://github.com/rust-lang/rust/pull/37627
7438 [37642]: https://github.com/rust-lang/rust/pull/37642
7439 [37677]: https://github.com/rust-lang/rust/pull/37677
7440 [37699]: https://github.com/rust-lang/rust/pull/37699
7441 [37701]: https://github.com/rust-lang/rust/pull/37701
7442 [37705]: https://github.com/rust-lang/rust/pull/37705
7443 [37749]: https://github.com/rust-lang/rust/pull/37749
7444 [37760]: https://github.com/rust-lang/rust/pull/37760
7445 [37763]: https://github.com/rust-lang/rust/pull/37763
7446 [37764]: https://github.com/rust-lang/rust/pull/37764
7447 [37789]: https://github.com/rust-lang/rust/pull/37789
7448 [37791]: https://github.com/rust-lang/rust/pull/37791
7449 [37814]: https://github.com/rust-lang/rust/pull/37814
7450 [37817]: https://github.com/rust-lang/rust/pull/37817
7451 [37834]: https://github.com/rust-lang/rust/pull/37834
7452 [37848]: https://github.com/rust-lang/rust/pull/37848
7453 [37855]: https://github.com/rust-lang/rust/pull/37855
7454 [37882]: https://github.com/rust-lang/rust/pull/37882
7455 [37888]: https://github.com/rust-lang/rust/pull/37888
7456 [37973]: https://github.com/rust-lang/rust/pull/37973
7457 [37979]: https://github.com/rust-lang/rust/pull/37979
7458 [38086]: https://github.com/rust-lang/rust/pull/38086
7459 [38107]: https://github.com/rust-lang/rust/pull/38107
7460 [38117]: https://github.com/rust-lang/rust/pull/38117
7461 [38134]: https://github.com/rust-lang/rust/pull/38134
7462 [38146]: https://github.com/rust-lang/rust/pull/38146
7463 [38181]: https://github.com/rust-lang/rust/pull/38181
7464 [38182]: https://github.com/rust-lang/rust/pull/38182
7465 [38185]: https://github.com/rust-lang/rust/pull/38185
7466 [38192]: https://github.com/rust-lang/rust/pull/38192
7467 [38279]: https://github.com/rust-lang/rust/pull/38279
7468 [38835]: https://github.com/rust-lang/rust/pull/38835
7469 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7470 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7471 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7472 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7473 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7474 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7475 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7476 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7477 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7478 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7479 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7480 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7481 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7482 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7483 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7484 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7485 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7486 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7487 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7488 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7489 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7490 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7491 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7492 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7493 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7494 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7495 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7496 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7497 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7498 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7499 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7500 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7501 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7502 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7503 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7504 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7505 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7508 Version 1.14.0 (2016-12-22)
7509 ===========================
7514 * [`..` matches multiple tuple fields in enum variants, structs
7515 and tuples][36843]. [RFC 1492].
7516 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7517 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7518 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7519 dereferencing][36822]
7524 * [Mark enums with non-zero discriminant as non-zero][37224]
7525 * [Lower-case `static mut` names are linted like other
7526 statics and consts][37162]
7527 * [Fix ICE on some macros in const integer positions
7528 (e.g. `[u8; m!()]`)][36819]
7529 * [Improve error message and snippet for "did you mean `x`"][36798]
7530 * [Add a panic-strategy field to the target specification][36794]
7531 * [Include LLVM version in `--version --verbose`][37200]
7533 Compile-time Optimizations
7534 --------------------------
7536 * [Improve macro expansion performance][37569]
7537 * [Shrink `Expr_::ExprInlineAsm`][37445]
7538 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7539 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7540 * [Avoid more allocations when compiling html5ever][37373]
7541 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7542 * [Avoid some allocations in the macro parser][37318]
7543 * [Use a faster deflate setting][37298]
7544 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7545 during interning of slices][37270]
7546 * [Optimize `write_metadata`][37267]
7547 * [Don't process obligation forest cycles when stalled][37231]
7548 * [Avoid many `CrateConfig` clones][37161]
7549 * [Optimize `Substs::super_fold_with`][37108]
7550 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7551 * [Speed up `plug_leaks`][36917]
7556 * [`println!()`, with no arguments, prints newline][36825].
7557 Previously, an empty string was required to achieve the same.
7558 * [`Wrapping` impls standard binary and unary operators, as well as
7559 the `Sum` and `Product` iterators][37356]
7560 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7562 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7563 `VecDeque` iterators][37315]
7564 * [Improve `SipHasher` performance on small values][37312]
7565 * [Add Iterator trait TrustedLen to enable better FromIterator /
7567 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7568 * [`ReadDir` implements `Debug`][37221]
7569 * [Implement `RefUnwindSafe` for atomic types][37178]
7570 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7571 * [Avoid allocations in `Decoder::read_str`][37064]
7572 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7573 * [Impl `Debug` for raw pointers to unsized data][36880]
7574 * [Don't reuse `HashMap` random seeds][37470]
7575 * [The internal memory layout of `HashMap` is more cache-friendly, for
7576 significant improvements in some operations][36692]
7577 * [`HashMap` uses less memory on 32-bit architectures][36595]
7578 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7583 * [Expose rustc cfg values to build scripts][cargo/3243]
7584 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7585 * [Fix passing --features when testing multiple packages][cargo/3280]
7586 * [Use a single profile set per workspace][cargo/3249]
7587 * [Load `replace` sections from lock files][cargo/3220]
7588 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7593 * [rustup is the recommended Rust installation method][1.14rustup]
7594 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7595 S390x. These are [tier 2] platforms and may have major defects. Follow the
7596 instructions on the website to install, or add the targets to an existing
7597 installation with `rustup target add`. The new target triples are:
7598 - `mips-unknown-linux-gnu`
7599 - `mipsel-unknown-linux-gnu`
7600 - `mips64-unknown-linux-gnuabi64`
7601 - `mips64el-unknown-linux-gnuabi64 `
7602 - `powerpc-unknown-linux-gnu`
7603 - `powerpc64-unknown-linux-gnu`
7604 - `powerpc64le-unknown-linux-gnu`
7605 - `s390x-unknown-linux-gnu `
7606 * This release includes target (std) builds for ARM Linux running MUSL
7607 libc. These are [tier 2] platforms and may have major defects. Add the
7608 following triples to an existing rustup installation with `rustup target add`:
7609 - `arm-unknown-linux-musleabi`
7610 - `arm-unknown-linux-musleabihf`
7611 - `armv7-unknown-linux-musleabihf`
7612 * This release includes [experimental support for WebAssembly][1.14wasm], via
7613 the `wasm32-unknown-emscripten` target. This target is known to have major
7614 defects. Please test, report, and fix.
7615 * rustup no longer installs documentation by default. Run `rustup
7616 component add rust-docs` to install.
7617 * [Fix line stepping in debugger][37310]
7618 * [Enable line number debuginfo in releases][37280]
7623 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7624 * [Add support for Fuchsia OS][37313]
7625 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7630 * [A number of forward-compatibility lints used by the compiler
7631 to gradually introduce language changes have been converted
7632 to deny by default][36894]:
7633 - ["use of inaccessible extern crate erroneously allowed"][36886]
7634 - ["type parameter default erroneously allowed in invalid location"][36887]
7635 - ["detects super or self keywords at the beginning of global path"][36888]
7636 - ["two overlapping inherent impls define an item with the same name
7637 were erroneously allowed"][36889]
7638 - ["floating-point constants cannot be used in patterns"][36890]
7639 - ["constants of struct or enum type can only be used in a pattern if
7640 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7641 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7642 * [Prohibit patterns in trait methods without bodies][37378]
7643 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7644 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7645 * [The `$crate` macro variable is accepted in fewer locations][37213]
7646 * [Impls specifying extra region requirements beyond the trait
7647 they implement are rejected][37167]
7648 * [Enums may not be unsized][37111]. Unsized enums are intended to
7649 work but never have. For now they are forbidden.
7650 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7652 [tier 2]: https://forge.rust-lang.org/platform-support.html
7653 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7654 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7655 [36430]: https://github.com/rust-lang/rust/pull/36430
7656 [36595]: https://github.com/rust-lang/rust/pull/36595
7657 [36692]: https://github.com/rust-lang/rust/pull/36692
7658 [36767]: https://github.com/rust-lang/rust/pull/36767
7659 [36794]: https://github.com/rust-lang/rust/pull/36794
7660 [36798]: https://github.com/rust-lang/rust/pull/36798
7661 [36819]: https://github.com/rust-lang/rust/pull/36819
7662 [36822]: https://github.com/rust-lang/rust/pull/36822
7663 [36825]: https://github.com/rust-lang/rust/pull/36825
7664 [36843]: https://github.com/rust-lang/rust/pull/36843
7665 [36880]: https://github.com/rust-lang/rust/pull/36880
7666 [36886]: https://github.com/rust-lang/rust/issues/36886
7667 [36887]: https://github.com/rust-lang/rust/issues/36887
7668 [36888]: https://github.com/rust-lang/rust/issues/36888
7669 [36889]: https://github.com/rust-lang/rust/issues/36889
7670 [36890]: https://github.com/rust-lang/rust/issues/36890
7671 [36891]: https://github.com/rust-lang/rust/issues/36891
7672 [36892]: https://github.com/rust-lang/rust/issues/36892
7673 [36894]: https://github.com/rust-lang/rust/pull/36894
7674 [36917]: https://github.com/rust-lang/rust/pull/36917
7675 [36993]: https://github.com/rust-lang/rust/pull/36993
7676 [37037]: https://github.com/rust-lang/rust/pull/37037
7677 [37064]: https://github.com/rust-lang/rust/pull/37064
7678 [37094]: https://github.com/rust-lang/rust/pull/37094
7679 [37108]: https://github.com/rust-lang/rust/pull/37108
7680 [37111]: https://github.com/rust-lang/rust/pull/37111
7681 [37161]: https://github.com/rust-lang/rust/pull/37161
7682 [37162]: https://github.com/rust-lang/rust/pull/37162
7683 [37167]: https://github.com/rust-lang/rust/pull/37167
7684 [37178]: https://github.com/rust-lang/rust/pull/37178
7685 [37200]: https://github.com/rust-lang/rust/pull/37200
7686 [37213]: https://github.com/rust-lang/rust/pull/37213
7687 [37221]: https://github.com/rust-lang/rust/pull/37221
7688 [37224]: https://github.com/rust-lang/rust/pull/37224
7689 [37230]: https://github.com/rust-lang/rust/pull/37230
7690 [37231]: https://github.com/rust-lang/rust/pull/37231
7691 [37247]: https://github.com/rust-lang/rust/pull/37247
7692 [37267]: https://github.com/rust-lang/rust/pull/37267
7693 [37270]: https://github.com/rust-lang/rust/pull/37270
7694 [37273]: https://github.com/rust-lang/rust/pull/37273
7695 [37280]: https://github.com/rust-lang/rust/pull/37280
7696 [37298]: https://github.com/rust-lang/rust/pull/37298
7697 [37306]: https://github.com/rust-lang/rust/pull/37306
7698 [37310]: https://github.com/rust-lang/rust/pull/37310
7699 [37312]: https://github.com/rust-lang/rust/pull/37312
7700 [37313]: https://github.com/rust-lang/rust/pull/37313
7701 [37315]: https://github.com/rust-lang/rust/pull/37315
7702 [37318]: https://github.com/rust-lang/rust/pull/37318
7703 [37322]: https://github.com/rust-lang/rust/pull/37322
7704 [37326]: https://github.com/rust-lang/rust/pull/37326
7705 [37351]: https://github.com/rust-lang/rust/pull/37351
7706 [37356]: https://github.com/rust-lang/rust/pull/37356
7707 [37367]: https://github.com/rust-lang/rust/pull/37367
7708 [37373]: https://github.com/rust-lang/rust/pull/37373
7709 [37378]: https://github.com/rust-lang/rust/pull/37378
7710 [37389]: https://github.com/rust-lang/rust/pull/37389
7711 [37392]: https://github.com/rust-lang/rust/pull/37392
7712 [37427]: https://github.com/rust-lang/rust/pull/37427
7713 [37439]: https://github.com/rust-lang/rust/pull/37439
7714 [37445]: https://github.com/rust-lang/rust/pull/37445
7715 [37470]: https://github.com/rust-lang/rust/pull/37470
7716 [37569]: https://github.com/rust-lang/rust/pull/37569
7717 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7718 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7719 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7720 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7721 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7722 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7723 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7726 Version 1.13.0 (2016-11-10)
7727 ===========================
7732 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7733 errors, like the `try!` macro, described in [RFC 0243].
7734 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7735 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7736 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7737 * [Fix lifetime rules for 'if' conditions][36029]
7738 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7743 * [Add the `-C link-arg` argument][36574]
7744 * [Remove the old AST-based backend from rustc_trans][35764]
7745 * [Don't enable NEON by default on armv7 Linux][35814]
7746 * [Fix debug line number info for macro expansions][35238]
7747 * [Do not emit "class method" debuginfo for types that are not
7748 DICompositeType][36008]
7749 * [Warn about multiple conflicting #[repr] hints][34623]
7750 * [When sizing DST, don't double-count nested struct prefixes][36351]
7751 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7752 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7753 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7754 * [Expand macros without recursing to avoid stack overflows][36214]
7759 * [Replace macro backtraces with labeled local uses][35702]
7760 * [Improve error message for misplaced doc comments][33922]
7761 * [Buffer unix and lock windows to prevent message interleaving][35975]
7762 * [Update lifetime errors to specifically note temporaries][36171]
7763 * [Special case a few colors for Windows][36178]
7764 * [Suggest `use self` when such an import resolves][36289]
7765 * [Be more specific when type parameter shadows primitive type][36338]
7766 * Many minor improvements
7768 Compile-time Optimizations
7769 --------------------------
7771 * [Compute and cache HIR hashes at beginning][35854]
7772 * [Don't hash types in loan paths][36004]
7773 * [Cache projections in trans][35761]
7774 * [Optimize the parser's last token handling][36527]
7775 * [Only instantiate #[inline] functions in codegen units referencing
7776 them][36524]. This leads to big improvements in cases where crates export
7777 define many inline functions without using them directly.
7778 * [Lazily allocate TypedArena's first chunk][36592]
7779 * [Don't allocate during default HashSet creation][36734]
7786 * [`overflowing_abs`]
7787 * [`RefCell::try_borrow`]
7788 * [`RefCell::try_borrow_mut`]
7793 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7794 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7796 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7797 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7798 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7799 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7800 * [Use arc4rand on FreeBSD][35884]
7801 * [memrchr: Correct aligned offset computation][35969]
7802 * [Improve Demangling of Rust Symbols][36059]
7803 * [Use monotonic time in condition variables][35048]
7804 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7805 * [Implement conversion traits for `char`][35755]
7806 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7807 * [Zero first byte of CString on drop][36264]
7808 * [Inherit overflow checks for sum and product][36372]
7809 * [Add missing Eq implementations][36423]
7810 * [Implement `Debug` for `DirEntry`][36631]
7811 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7813 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7814 * [Implement more traits for `std::io::ErrorKind`][35911]
7815 * [Optimize BinaryHeap bounds checking][36072]
7816 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7817 `extend_with_element`][36355]
7818 * [Fix overflow checking in unsigned pow()][34942]
7823 * This release includes security fixes to both curl and OpenSSL.
7824 * [Fix transitive doctests when panic=abort][cargo/3021]
7825 * [Add --all-features flag to cargo][cargo/3038]
7826 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7827 * [Don't parse the home directory more than once][cargo/3078]
7828 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7829 * [Update OpenSSL to 1.0.2j][cargo/3121]
7830 * [Add license and license_file to cargo metadata output][cargo/3110]
7831 * [Make crates-io registry URL optional in config; ignore all changes to
7832 source.crates-io][cargo/3089]
7833 * [Don't download dependencies from other platforms][cargo/3123]
7834 * [Build transitive dev-dependencies when needed][cargo/3125]
7835 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7836 * [Avoid updating registry when adding existing deps][cargo/3144]
7837 * [Warn about path overrides that won't work][cargo/3136]
7838 * [Use workspaces during `cargo install`][cargo/3146]
7839 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7840 * [Add --message-format flag][cargo/3000]
7841 * [Pass target environment for rustdoc][cargo/3205]
7842 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7843 * [Update curl and curl-sys][cargo/3241]
7844 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7849 * [rustdoc: Add the `--sysroot` argument][36586]
7850 * [rustdoc: Fix a couple of issues with the search results][35655]
7851 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7852 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7853 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7858 * [Remove unmaintained style guide][35124]
7859 * [Add s390x support][36369]
7860 * [Initial work at Haiku OS support][36727]
7861 * [Add mips-uclibc targets][35734]
7862 * [Crate-ify compiler-rt into compiler-builtins][35021]
7863 * [Add rustc version info (git hash + date) to dist tarball][36213]
7864 * Many documentation improvements
7869 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7870 * [Deny (by default) transmuting from fn item types to pointer-sized
7871 types][34923]. Continuing the long transition to zero-sized fn items,
7873 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7875 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7876 * [Fix lifetime rules for 'if' conditions][36029].
7877 * [Inherit overflow checks for sum and product][36372].
7878 * [Forbid user-defined macros named "macro_rules"][36730].
7880 [33922]: https://github.com/rust-lang/rust/pull/33922
7881 [34623]: https://github.com/rust-lang/rust/pull/34623
7882 [34923]: https://github.com/rust-lang/rust/pull/34923
7883 [34942]: https://github.com/rust-lang/rust/pull/34942
7884 [35021]: https://github.com/rust-lang/rust/pull/35021
7885 [35048]: https://github.com/rust-lang/rust/pull/35048
7886 [35074]: https://github.com/rust-lang/rust/pull/35074
7887 [35124]: https://github.com/rust-lang/rust/pull/35124
7888 [35234]: https://github.com/rust-lang/rust/pull/35234
7889 [35238]: https://github.com/rust-lang/rust/pull/35238
7890 [35354]: https://github.com/rust-lang/rust/pull/35354
7891 [35559]: https://github.com/rust-lang/rust/pull/35559
7892 [35585]: https://github.com/rust-lang/rust/pull/35585
7893 [35627]: https://github.com/rust-lang/rust/pull/35627
7894 [35655]: https://github.com/rust-lang/rust/pull/35655
7895 [35702]: https://github.com/rust-lang/rust/pull/35702
7896 [35707]: https://github.com/rust-lang/rust/pull/35707
7897 [35728]: https://github.com/rust-lang/rust/pull/35728
7898 [35734]: https://github.com/rust-lang/rust/pull/35734
7899 [35755]: https://github.com/rust-lang/rust/pull/35755
7900 [35761]: https://github.com/rust-lang/rust/pull/35761
7901 [35764]: https://github.com/rust-lang/rust/pull/35764
7902 [35814]: https://github.com/rust-lang/rust/pull/35814
7903 [35854]: https://github.com/rust-lang/rust/pull/35854
7904 [35871]: https://github.com/rust-lang/rust/pull/35871
7905 [35884]: https://github.com/rust-lang/rust/pull/35884
7906 [35911]: https://github.com/rust-lang/rust/pull/35911
7907 [35969]: https://github.com/rust-lang/rust/pull/35969
7908 [35975]: https://github.com/rust-lang/rust/pull/35975
7909 [36004]: https://github.com/rust-lang/rust/pull/36004
7910 [36008]: https://github.com/rust-lang/rust/pull/36008
7911 [36014]: https://github.com/rust-lang/rust/pull/36014
7912 [36029]: https://github.com/rust-lang/rust/pull/36029
7913 [36059]: https://github.com/rust-lang/rust/pull/36059
7914 [36072]: https://github.com/rust-lang/rust/pull/36072
7915 [36101]: https://github.com/rust-lang/rust/pull/36101
7916 [36104]: https://github.com/rust-lang/rust/pull/36104
7917 [36171]: https://github.com/rust-lang/rust/pull/36171
7918 [36173]: https://github.com/rust-lang/rust/pull/36173
7919 [36178]: https://github.com/rust-lang/rust/pull/36178
7920 [36213]: https://github.com/rust-lang/rust/pull/36213
7921 [36214]: https://github.com/rust-lang/rust/pull/36214
7922 [36264]: https://github.com/rust-lang/rust/pull/36264
7923 [36266]: https://github.com/rust-lang/rust/pull/36266
7924 [36289]: https://github.com/rust-lang/rust/pull/36289
7925 [36338]: https://github.com/rust-lang/rust/pull/36338
7926 [36351]: https://github.com/rust-lang/rust/pull/36351
7927 [36355]: https://github.com/rust-lang/rust/pull/36355
7928 [36369]: https://github.com/rust-lang/rust/pull/36369
7929 [36372]: https://github.com/rust-lang/rust/pull/36372
7930 [36423]: https://github.com/rust-lang/rust/pull/36423
7931 [36482]: https://github.com/rust-lang/rust/pull/36482
7932 [36505]: https://github.com/rust-lang/rust/pull/36505
7933 [36524]: https://github.com/rust-lang/rust/pull/36524
7934 [36527]: https://github.com/rust-lang/rust/pull/36527
7935 [36551]: https://github.com/rust-lang/rust/pull/36551
7936 [36574]: https://github.com/rust-lang/rust/pull/36574
7937 [36586]: https://github.com/rust-lang/rust/pull/36586
7938 [36592]: https://github.com/rust-lang/rust/pull/36592
7939 [36631]: https://github.com/rust-lang/rust/pull/36631
7940 [36721]: https://github.com/rust-lang/rust/pull/36721
7941 [36727]: https://github.com/rust-lang/rust/pull/36727
7942 [36730]: https://github.com/rust-lang/rust/pull/36730
7943 [36734]: https://github.com/rust-lang/rust/pull/36734
7944 [36754]: https://github.com/rust-lang/rust/pull/36754
7945 [36995]: https://github.com/rust-lang/rust/pull/36995
7946 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7947 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7948 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7949 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7950 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7951 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7952 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7953 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7954 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7955 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7956 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7957 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7958 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7959 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7960 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7961 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7962 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7963 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7964 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7965 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7966 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7967 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7968 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7969 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7970 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7971 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7972 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7973 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7974 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7975 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7976 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7977 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7980 Version 1.12.1 (2016-10-20)
7981 ===========================
7986 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7987 * [Confusion with double negation and booleans][36856]
7988 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7989 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7990 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7991 * [Corrupted memory after updated to 1.12][36936]
7992 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7993 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7994 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7996 [36381]: https://github.com/rust-lang/rust/issues/36381
7997 [36856]: https://github.com/rust-lang/rust/issues/36856
7998 [36875]: https://github.com/rust-lang/rust/issues/36875
7999 [36924]: https://github.com/rust-lang/rust/issues/36924
8000 [36926]: https://github.com/rust-lang/rust/issues/36926
8001 [36936]: https://github.com/rust-lang/rust/issues/36936
8002 [37026]: https://github.com/rust-lang/rust/issues/37026
8003 [37112]: https://github.com/rust-lang/rust/issues/37112
8004 [37153]: https://github.com/rust-lang/rust/issues/37153
8007 Version 1.12.0 (2016-09-29)
8008 ===========================
8013 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8014 This translation pass is far simpler than the previous AST->LLVM pass, and
8015 creates opportunities to perform new optimizations directly on the MIR. It
8016 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8017 * [`rustc` presents a new, more readable error format, along with
8018 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8019 Most common editors supporting Rust have been updated to work with it. It was
8020 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8025 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8026 This translation pass is far simpler than the previous AST->LLVM pass, and
8027 creates opportunities to perform new optimizations directly on the MIR. It
8028 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8029 * [Print the Rust target name, not the LLVM target name, with
8030 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8031 * [The computation of `TypeId` is correct in some cases where it was previously
8032 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8033 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8034 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8035 `--print relocation-models`, and `--print code-models` print the available
8036 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8037 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8038 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8039 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8040 These targets produce statically-linked binaries. There are no binary release
8046 * [`rustc` presents a new, more readable error format, along with
8047 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8048 Most common editors supporting Rust have been updated to work with it. It was
8049 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8050 * [In error descriptions, references are now described in plain English,
8051 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8052 * [In error type descriptions, unknown numeric types are named `{integer}` or
8053 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8054 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8059 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8060 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8061 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8062 useful](https://github.com/rust-lang/rust/pull/34908)
8063 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8064 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8065 * [Semicolons are properly required as statement delimiters inside
8066 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8067 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8072 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8073 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8074 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8075 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8076 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8077 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8078 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8079 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8080 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8081 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8082 Both on Unix and Windows.
8083 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8084 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8085 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8086 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8087 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8088 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8089 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8090 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8095 * [The `format!` macro and friends now allow a single argument to be formatted
8096 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8097 * [The lifetime bounds on `[T]::binary_search_by` and
8098 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8099 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8100 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8101 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8102 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8103 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8104 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8105 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8106 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8107 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8108 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8109 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8110 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8111 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8112 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8113 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8114 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8115 * [`mpsc::sync_channel` `Receiver`s return any available message before
8116 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8117 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8118 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8123 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8124 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8125 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8126 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8127 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8128 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8129 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8130 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8131 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8132 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8133 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8134 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8135 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8136 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8137 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8138 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8143 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8144 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8149 * [Test binaries now support a `--test-threads` argument to specify the number
8150 of threads used to run tests, and which acts the same as the
8151 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8152 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8153 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8154 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8155 * [Rust releases now come with source packages that can be installed by rustup
8156 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8157 The resulting source code can be used by tools and IDES, located in the
8158 sysroot under `lib/rustlib/src`.
8163 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8164 * Many minor improvements to the documentation.
8165 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8170 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8171 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8172 * [When formatting strings, if "precision" is specified, the "fill",
8173 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8174 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8177 Version 1.11.0 (2016-08-18)
8178 ===========================
8183 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8184 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8185 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8186 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8191 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8192 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8193 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8194 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8195 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8196 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8197 (in libcore - previously stabilized in libstd)
8198 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8199 (in libcore - previously stabilized in libstd)
8200 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8201 (in libcore - previously stabilized in libstd)
8202 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8203 (in libcore - previously stabilized in libstd)
8204 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8205 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8206 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8207 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8212 * [The `thread_local!` macro supports multiple definitions in a single
8213 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8214 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8215 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8216 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8217 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8218 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8219 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8220 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8225 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8226 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8227 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8228 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8229 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8230 and `-vv` prints warnings for all crates.
8231 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8232 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8233 This provides room for expansion by arbitrary tools.
8234 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8235 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8236 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8237 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8238 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8239 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8240 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8245 * [Caching projections speeds up type check dramatically for some
8246 workloads](https://github.com/rust-lang/rust/pull/33816)
8247 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8248 This hasher is faster, but is believed to provide sufficient
8249 protection from collision attacks.
8250 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8255 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8256 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8257 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8258 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8259 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8264 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8265 * [When emitting debug info, rustc emits frame pointers for closures,
8266 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8267 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8268 * Many more errors have been given error codes and extended
8270 * API documentation continues to be improved, with many new examples
8275 * [rustc no longer hangs when dependencies recursively re-export
8276 submodules](https://github.com/rust-lang/rust/pull/34542)
8277 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8278 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8279 rewritten](https://github.com/rust-lang/rust/pull/33895)
8280 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8281 No targets use this yet, but it works toward AVR support.
8286 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8287 * [The new follow-set rules that place restrictions on `macro_rules!`
8288 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8289 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8290 and has been a warning since 1.10.
8291 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8292 This causes breakage in some corner cases.
8295 Version 1.10.0 (2016-07-07)
8296 ===========================
8301 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8302 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8303 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8304 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8305 * [`panic!` can be converted to a runtime abort with the
8306 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8307 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8308 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8309 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8310 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8311 Note that Cargo does not yet directly support cdylibs.
8316 * `os::windows::fs::OpenOptionsExt::access_mode`
8317 * `os::windows::fs::OpenOptionsExt::share_mode`
8318 * `os::windows::fs::OpenOptionsExt::custom_flags`
8319 * `os::windows::fs::OpenOptionsExt::attributes`
8320 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8321 * `os::unix::fs::OpenOptionsExt::custom_flags`
8322 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8323 * `Default for sync::Weak`
8324 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8325 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8326 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8327 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8328 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8329 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8330 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8331 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8332 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8333 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8334 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8335 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8336 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8337 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8338 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8339 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8340 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8341 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8342 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8343 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8344 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8345 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8346 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8347 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8348 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8349 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8350 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8351 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8352 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8353 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8354 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8355 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8356 * Read/Write/RawFd impls for `UnixStream`
8357 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8358 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8359 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8360 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8361 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8362 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8363 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8364 * RawFd impls for `UnixListener`
8365 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8366 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8367 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8368 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8369 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8370 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8371 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8372 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8373 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8374 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8375 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8376 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8377 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8378 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8379 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8380 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8381 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8382 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8383 * RawFd impls for `UnixDatagram`
8384 * `{BTree,Hash}Map::values_mut`
8385 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8390 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8391 The semantics of this minor method are subtle and probably not what
8393 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8394 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8395 will fall back to `/dev/urandom` temporarily to avoid blocking
8396 during early boot](https://github.com/rust-lang/rust/pull/33086).
8397 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8398 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8399 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8400 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8401 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8402 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8403 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8407 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8408 This controls the runtime behavior of the `panic!` macro
8409 and can be either "unwind" (the default), or "abort".
8410 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8411 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8412 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8413 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8414 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8415 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8416 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8417 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8418 By default they are retried twice, which can be customized with the
8419 `net.retry` value in `.cargo/config`.
8420 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8421 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8422 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8423 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8424 Makes it possible to install multiple crates in parallel.
8425 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8426 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8427 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8428 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8429 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8430 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8435 * [rustc memory usage was reduced by refactoring the context used for
8436 type checking](https://github.com/rust-lang/rust/pull/33425).
8437 * [Speed up creation of `HashMap`s by caching the random keys used
8438 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8439 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8440 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8441 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8442 10x faster than the previous lookup tables.
8443 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8448 * Many incremental improvements to documentation and rustdoc.
8449 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8450 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8451 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8452 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8453 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8454 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8455 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8460 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8461 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8462 * [`std` no longer prints backtraces on platforms where the running
8463 module must be loaded with `env::current_exe`, which can't be relied
8464 on](https://github.com/rust-lang/rust/pull/33554).
8465 * This release includes std binaries for the i586-unknown-linux-gnu,
8466 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8467 i586 target is for old x86 hardware without SSE2, and the armv7
8468 target is for Android running on modern ARM architectures.
8469 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8470 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8471 * [On Unix the runtime aborts by calling `libc::abort` instead of
8472 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8473 * [Rust is now bootstrapped from the previous release of Rust,
8474 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8479 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8480 * [`target_env` for Linux ARM targets is just `gnu`, not
8481 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8482 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8483 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8484 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8485 Affects how macros are parsed.
8486 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8487 * [Feature-gated attributes on macro-generated macro invocations are
8488 now rejected](https://github.com/rust-lang/rust/pull/32791).
8489 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8490 This caused some minor changes to type inference.
8493 Version 1.9.0 (2016-05-26)
8494 ==========================
8499 * The `#[deprecated]` attribute when applied to an API will generate
8500 warnings when used. The warnings may be suppressed with
8501 `#[allow(deprecated)]`. [RFC 1270].
8502 * [`fn` item types are zero sized, and each `fn` names a unique
8503 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8504 `transmute` on a `fn` type will generate a warning for a few cycles,
8505 then will be converted to an error.
8506 * [Field and method resolution understand visibility, so private
8507 fields and methods cannot prevent the proper use of public fields
8508 and methods][1.9fv].
8509 * [The parser considers unicode codepoints in the
8510 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8516 * [`std::panic::catch_unwind`] (renamed from `recover`)
8517 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8518 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8519 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8520 * [`str::is_char_boundary`]
8521 * [`<*const T>::as_ref`]
8522 * [`<*mut T>::as_ref`]
8523 * [`<*mut T>::as_mut`]
8524 * [`AsciiExt::make_ascii_uppercase`]
8525 * [`AsciiExt::make_ascii_lowercase`]
8526 * [`char::decode_utf16`]
8527 * [`char::DecodeUtf16`]
8528 * [`char::DecodeUtf16Error`]
8529 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8530 * [`BTreeSet::take`]
8531 * [`BTreeSet::replace`]
8534 * [`HashSet::replace`]
8536 * [`OsString::with_capacity`]
8537 * [`OsString::clear`]
8538 * [`OsString::capacity`]
8539 * [`OsString::reserve`]
8540 * [`OsString::reserve_exact`]
8541 * [`OsStr::is_empty`]
8543 * [`std::os::unix::thread`]
8546 * [`JoinHandleExt::as_pthread_t`]
8547 * [`JoinHandleExt::into_pthread_t`]
8548 * [`HashSet::hasher`]
8549 * [`HashMap::hasher`]
8550 * [`CommandExt::exec`]
8551 * [`File::try_clone`]
8552 * [`SocketAddr::set_ip`]
8553 * [`SocketAddr::set_port`]
8554 * [`SocketAddrV4::set_ip`]
8555 * [`SocketAddrV4::set_port`]
8556 * [`SocketAddrV6::set_ip`]
8557 * [`SocketAddrV6::set_port`]
8558 * [`SocketAddrV6::set_flowinfo`]
8559 * [`SocketAddrV6::set_scope_id`]
8560 * [`slice::copy_from_slice`]
8561 * [`ptr::read_volatile`]
8562 * [`ptr::write_volatile`]
8563 * [`OpenOptions::create_new`]
8564 * [`TcpStream::set_nodelay`]
8565 * [`TcpStream::nodelay`]
8566 * [`TcpStream::set_ttl`]
8567 * [`TcpStream::ttl`]
8568 * [`TcpStream::set_only_v6`]
8569 * [`TcpStream::only_v6`]
8570 * [`TcpStream::take_error`]
8571 * [`TcpStream::set_nonblocking`]
8572 * [`TcpListener::set_ttl`]
8573 * [`TcpListener::ttl`]
8574 * [`TcpListener::set_only_v6`]
8575 * [`TcpListener::only_v6`]
8576 * [`TcpListener::take_error`]
8577 * [`TcpListener::set_nonblocking`]
8578 * [`UdpSocket::set_broadcast`]
8579 * [`UdpSocket::broadcast`]
8580 * [`UdpSocket::set_multicast_loop_v4`]
8581 * [`UdpSocket::multicast_loop_v4`]
8582 * [`UdpSocket::set_multicast_ttl_v4`]
8583 * [`UdpSocket::multicast_ttl_v4`]
8584 * [`UdpSocket::set_multicast_loop_v6`]
8585 * [`UdpSocket::multicast_loop_v6`]
8586 * [`UdpSocket::set_multicast_ttl_v6`]
8587 * [`UdpSocket::multicast_ttl_v6`]
8588 * [`UdpSocket::set_ttl`]
8589 * [`UdpSocket::ttl`]
8590 * [`UdpSocket::set_only_v6`]
8591 * [`UdpSocket::only_v6`]
8592 * [`UdpSocket::join_multicast_v4`]
8593 * [`UdpSocket::join_multicast_v6`]
8594 * [`UdpSocket::leave_multicast_v4`]
8595 * [`UdpSocket::leave_multicast_v6`]
8596 * [`UdpSocket::take_error`]
8597 * [`UdpSocket::connect`]
8598 * [`UdpSocket::send`]
8599 * [`UdpSocket::recv`]
8600 * [`UdpSocket::set_nonblocking`]
8605 * [`std::sync::Once` is poisoned if its initialization function
8607 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8608 * [Most types implement `fmt::Debug`][1.9db].
8609 * [The default buffer size used by `BufReader` and `BufWriter` was
8610 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8611 used by other languages.
8612 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8613 `Duration` additionally implements `*=` and `/=`][1.9ta].
8614 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8615 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8616 * [`Chain` implements `BufRead`][1.9ch].
8617 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8622 * [Cargo can now run concurrently][1.9cc].
8623 * [Top-level overrides allow specific revisions of crates to be
8624 overridden through the entire crate graph][1.9ct]. This is intended
8625 to make upgrades easier for large projects, by allowing crates to be
8626 forked temporarily until they've been upgraded and republished.
8627 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8628 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8629 on the commandline][1.9cf]. `rustc` arguments can also be specified
8630 in the `build.rustflags` configuration key.
8635 * [The time complexity of comparing variables for equivalence during type
8636 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8637 to major compilation time improvement in some scenarios.
8638 * [`ToString` is specialized for `str`, giving it the same performance
8639 as `to_owned`][1.9ts].
8640 * [Spawning processes with `Command::output` no longer creates extra
8642 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8643 for C-like enums][1.9cl].
8648 * [Passing the `--quiet` flag to a test runner will produce
8649 much-abbreviated output][1.9q].
8650 * The Rust Project now publishes std binaries for the
8651 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8652 `i586-pc-windows-msvc` targets.
8657 * [`std::sync::Once` is poisoned if its initialization function
8659 * [It is illegal to define methods with the same name in overlapping
8660 inherent `impl` blocks][1.9sn].
8661 * [`fn` item types are zero sized, and each `fn` names a unique
8662 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8663 `transmute` on a `fn` type will generate a warning for a few cycles,
8664 then will be converted to an error.
8665 * [Improvements to const evaluation may trigger new errors when integer
8666 literals are out of range][1.9ce].
8669 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8670 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8671 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8672 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8673 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8674 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8675 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8676 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8677 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8678 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8679 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8680 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8681 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8682 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8683 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8684 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8685 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8686 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8687 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8688 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8689 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8690 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8691 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8692 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8693 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8694 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8695 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8696 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8697 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8698 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8699 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8700 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8701 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8702 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8703 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8704 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8705 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8706 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8707 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8708 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8709 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8710 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8711 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8712 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8713 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8714 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8715 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8716 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8717 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8718 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8719 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8720 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8721 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8722 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8723 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8724 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8725 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8726 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8727 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8728 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8729 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8730 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8731 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8732 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8733 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8734 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8735 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8736 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8737 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8738 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8739 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8740 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8741 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8742 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8743 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8744 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8745 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8746 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8747 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8748 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8749 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8750 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8751 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8752 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8753 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8754 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8755 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8756 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8757 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8758 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8759 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8760 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8761 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8762 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8763 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8764 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8765 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8766 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8767 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8768 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8769 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8770 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8771 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8772 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8773 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8774 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8775 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8776 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8777 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8778 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8781 Version 1.8.0 (2016-04-14)
8782 ==========================
8787 * Rust supports overloading of compound assignment statements like
8788 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8789 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8790 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8792 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8793 addition to the non-braced form, `struct Foo;`. [RFC 218].
8799 * [`str::encode_utf16`] (renamed from `utf16_units`)
8800 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8803 * [`ptr::drop_in_place`]
8805 * [`time::SystemTime`]
8807 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8808 * [`Instant::elapsed`]
8809 * [`SystemTime::now`]
8810 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8811 * [`SystemTime::elapsed`]
8812 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8813 * [`SystemTimeError`]
8814 * [`SystemTimeError::duration`]
8815 * Various impls for `SystemTimeError`
8817 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8818 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8819 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8820 * [The `write!` and `writeln!` macros correctly emit errors if any of
8821 their arguments can't be formatted][1.8w].
8822 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8823 * [The Unix-specific `raw` modules, which contain a number of
8824 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8825 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8826 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8827 across platforms was making it difficult to implement `std`
8828 correctly. Those that need these definitions should use the `libc`
8830 * The Unix-specific `MetadataExt` traits, including
8831 `os::unix::fs::MetadataExt`, which expose values such as inode
8832 numbers [no longer return platform-specific types][1.8r], but
8833 instead return widened integers. [RFC 1415].
8834 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8835 * [Atomic loads and stores are not volatile][1.8a].
8836 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8841 * [Inlining hash functions lead to a 3% compile-time improvement in
8842 some workloads][1.8h].
8843 * When using jemalloc, its symbols are [unprefixed so that it
8844 overrides the libc malloc implementation][1.8h]. This means that for
8845 rustc, LLVM is now using jemalloc, which results in a 6%
8846 compile-time improvement on a specific workload.
8847 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8852 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8853 i686-pc-windows-msvc is now considered a tier-1 platform.
8854 * [The `--print targets` flag prints a list of supported targets][1.8t].
8855 * [The `--print cfg` flag prints the `cfg`s defined for the current
8857 * [`rustc` can be built with an new Cargo-based build system, written
8858 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8859 build system. To enable it configure with `configure --rustbuild`.
8860 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8861 variants while also indicating the total number of missing variants
8862 if more than 3][1.8m].
8863 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8864 * The Rust Project now publishes binary releases of the standard
8865 library for a number of tier-2 targets:
8866 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8867 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8868 `x86_64-rumprun-netbsd`. These can be installed with
8869 tools such as [multirust][1.8mr].
8874 * [`cargo init` creates a new Cargo project in the current
8875 directory][1.8ci]. It is otherwise like `cargo new`.
8876 * [Cargo has configuration keys for `-v` and
8877 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8878 `[term]` section of `.cargo/config`.
8879 * [Configuration keys that evaluate to strings or integers can be set
8880 via environment variables][1.8ce]. For example the `build.jobs` key
8881 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8882 precedence over config files.
8883 * [Target-specific dependencies support Rust `cfg` syntax for
8884 describing targets][1.8cfg] so that dependencies for multiple
8885 targets can be specified together. [RFC 1361].
8886 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8887 `RUSTDOC` take precedence over the `build.target-dir`,
8888 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8889 * [The child process tree is killed on Windows when Cargo is
8891 * [The `build.target` configuration value sets the target platform,
8892 like `--target`][1.8ct].
8897 * [Unstable compiler flags have been further restricted][1.8u]. Since
8898 1.0 `-Z` flags have been considered unstable, and other flags that
8899 were considered unstable additionally required passing `-Z
8900 unstable-options` to access. Unlike unstable language and library
8901 features though, these options have been accessible on the stable
8902 release channel. Going forward, *new unstable flags will not be
8903 available on the stable release channel*, and old unstable flags
8904 will warn about their usage. In the future, all unstable flags will
8905 be unavailable on the stable release channel.
8906 * [It is no longer possible to `match` on empty enum variants using
8907 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8908 * The Unix-specific `MetadataExt` traits, including
8909 `os::unix::fs::MetadataExt`, which expose values such as inode
8910 numbers [no longer return platform-specific types][1.8r], but
8911 instead return widened integers. [RFC 1415].
8912 * [Modules sourced from the filesystem cannot appear within arbitrary
8913 blocks, but only within other modules][1.8mf].
8914 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8915 * On Unix, [stack overflow triggers a runtime abort instead of a
8917 * [`Command::spawn` and its equivalents return an error if any of
8918 its command-line arguments contain interior `NUL`s][1.8n].
8919 * [Tuple and unit enum variants from other crates are in the type
8921 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8922 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8923 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8924 instead of `foo.lib`.
8927 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8928 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8929 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8930 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8931 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8932 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8933 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8934 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8935 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8936 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8937 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8938 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8939 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8940 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8941 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8942 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8943 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8944 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8945 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8946 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8947 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8948 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8949 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8950 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8951 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8952 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8953 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8954 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8955 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8956 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8957 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8958 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8959 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8960 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8961 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8962 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8963 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8964 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8965 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8966 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8967 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8968 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8969 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8970 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8971 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8972 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8973 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8974 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8975 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8976 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8977 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8978 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8979 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8980 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8981 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8982 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8983 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8984 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8985 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8986 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8989 Version 1.7.0 (2016-03-03)
8990 ==========================
8997 * [`Path::strip_prefix`] (renamed from relative_from)
8998 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
9000 * [`Ipv4Addr::is_loopback`]
9001 * [`Ipv4Addr::is_private`]
9002 * [`Ipv4Addr::is_link_local`]
9003 * [`Ipv4Addr::is_multicast`]
9004 * [`Ipv4Addr::is_broadcast`]
9005 * [`Ipv4Addr::is_documentation`]
9007 * [`Ipv6Addr::is_unspecified`]
9008 * [`Ipv6Addr::is_loopback`]
9009 * [`Ipv6Addr::is_multicast`]
9012 * [`Vec::as_mut_slice`]
9014 * [`String::as_str`]
9015 * [`String::as_mut_str`]
9017 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9019 * `<[T]>::`[`sort_by_key`]
9020 * checked, saturated, and overflowing operations
9021 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9022 * [`i32::saturating_mul`]
9023 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9024 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9025 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9026 * [`u32::saturating_mul`]
9027 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9028 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9029 * and checked, saturated, and overflowing operations for other primitive types
9031 * [`ffi::IntoStringError`]
9032 * [`CString::into_string`]
9033 * [`CString::into_bytes`]
9034 * [`CString::into_bytes_with_nul`]
9035 * `From<CString> for Vec<u8>`
9037 * [`IntoStringError::into_cstring`]
9038 * [`IntoStringError::utf8_error`]
9039 * `Error for IntoStringError`
9041 * [`std::hash::BuildHasher`]
9042 * [`BuildHasher::Hasher`]
9043 * [`BuildHasher::build_hasher`]
9044 * [`std::hash::BuildHasherDefault`]
9045 * [`HashMap::with_hasher`]
9046 * [`HashMap::with_capacity_and_hasher`]
9047 * [`HashSet::with_hasher`]
9048 * [`HashSet::with_capacity_and_hasher`]
9049 * [`std::collections::hash_map::RandomState`]
9050 * [`RandomState::new`]
9051 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9052 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9053 from bytes is faster.
9054 * [The performance of `LineWriter` (and thus `io::stdout`) was
9055 improved by using `memchr` to search for newlines][1.7m].
9056 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9057 `f64` variants were stabilized previously.
9058 * [`BTreeMap` was rewritten to use less memory and improve the performance
9059 of insertion and iteration, the latter by as much as 5x][1.7bm].
9060 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9061 covariant over their contained type][1.7bt].
9062 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9063 over their contained type][1.7ll].
9064 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9066 * [`Any` is implemented for unsized types][1.7a].
9067 * [`Hash` is implemented for `Duration`][1.7h].
9072 * [When running tests with `--test`, rustdoc will pass `--cfg`
9073 arguments to the compiler][1.7dt].
9074 * [The compiler is built with RPATH information by default][1.7rpa].
9075 This means that it will be possible to run `rustc` when installed in
9076 unusual configurations without configuring the dynamic linker search
9078 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9079 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9080 over `LD_LIBRARY_PATH`.
9085 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9086 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9087 * [The `rerun-if-changed` build script directive no longer causes the
9088 build script to incorrectly run twice in certain scenarios][1.7rr].
9093 * Soundness fixes to the interactions between associated types and
9094 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9095 code that violates the new rules. This is a significant change that
9096 is known to break existing code, so it has emitted warnings for the
9097 new error cases since 1.4 to give crate authors time to adapt. The
9098 details of what is changing are subtle; read the RFC for more.
9099 * [Several bugs in the compiler's visibility calculations were
9100 fixed][1.7v]. Since this was found to break significant amounts of
9101 code, the new errors will be emitted as warnings for several release
9102 cycles, under the `private_in_public` lint.
9103 * Defaulted type parameters were accidentally accepted in positions
9104 that were not intended. In this release, [defaulted type parameters
9105 appearing outside of type definitions will generate a
9106 warning][1.7d], which will become an error in future releases.
9107 * [Parsing "." as a float results in an error instead of 0][1.7p].
9108 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9109 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9111 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9112 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9113 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9114 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9115 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9116 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9117 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9118 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9119 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9120 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9121 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9122 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9123 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9124 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9125 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9126 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9127 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9128 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9129 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9130 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9131 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9132 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9133 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9134 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9135 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9136 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9137 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9138 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9139 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9140 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9141 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9142 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9143 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9144 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9145 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9146 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9147 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9148 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9149 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9150 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9151 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9152 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9153 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9154 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9155 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9156 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9157 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9158 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9159 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9160 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9161 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9162 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9163 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9164 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9165 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9166 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9167 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9168 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9169 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9170 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9171 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9172 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9173 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9174 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9175 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9176 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9177 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9178 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9179 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9180 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9181 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9182 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9183 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9184 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9185 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9186 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9187 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9188 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9189 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9192 Version 1.6.0 (2016-01-21)
9193 ==========================
9198 * The `#![no_std]` attribute causes a crate to not be linked to the
9199 standard library, but only the [core library][1.6co], as described
9200 in [RFC 1184]. The core library defines common types and traits but
9201 has no platform dependencies whatsoever, and is the basis for Rust
9202 software in environments that cannot support a full port of the
9203 standard library, such as operating systems. Most of the core
9204 library is now stable.
9210 [`Read::read_exact`],
9211 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9212 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9213 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9214 [`os::unix::fs::DirBuilderExt`],
9215 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9216 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9217 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9218 [`collections::hash_map::Drain`],
9219 [`collections::hash_map::HashMap::drain`],
9220 [`collections::hash_set::Drain`],
9221 [`collections::hash_set::HashSet::drain`],
9222 [`collections::binary_heap::Drain`],
9223 [`collections::binary_heap::BinaryHeap::drain`],
9224 [`Vec::extend_from_slice`] (renamed from `push_all`),
9225 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9226 [`RwLock::into_inner`],
9227 [`Iterator::min_by_key`] (renamed from `min_by`),
9228 [`Iterator::max_by_key`] (renamed from `max_by`).
9229 * The [core library][1.6co] is stable, as are most of its APIs.
9230 * [The `assert_eq!` macro supports arguments that don't implement
9231 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9233 * Several timer functions that take duration in milliseconds [are
9234 deprecated in favor of those that take `Duration`][1.6ms]. These
9235 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9236 `thread::park_timeout_ms`.
9237 * The algorithm by which `Vec` reserves additional elements was
9238 [tweaked to not allocate excessive space][1.6a] while still growing
9240 * `From` conversions are [implemented from integers to floats][1.6f]
9241 in cases where the conversion is lossless. Thus they are not
9242 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9243 or `f64`. They are also not implemented for `isize` and `usize`
9244 because the implementations would be platform-specific. `From` is
9245 also implemented from `f32` to `f64`.
9246 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9247 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9248 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9249 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9251 * Sorting slices that are already sorted [is 50% faster in some
9257 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9258 * Cargo build scripts can specify their dependencies by emitting the
9259 [`rerun-if-changed`][1.6rr] key.
9260 * crates.io will reject publication of crates with dependencies that
9261 have a wildcard version constraint. Crates with wildcard
9262 dependencies were seen to cause a variety of problems, as described
9263 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9265 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9266 release folder. A variety of artifacts that Cargo failed to clean
9267 are now correctly deleted.
9272 * The `unreachable_code` lint [warns when a function call's argument
9274 * The parser indicates [failures that may be caused by
9275 confusingly-similar Unicode characters][1.6uc]
9276 * Certain macro errors [are reported at definition time][1.6m], not
9282 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9283 environment variable when locating crates. This was a pre-cargo
9284 feature for integrating with the package manager that was
9285 accidentally never removed.
9286 * [A number of bugs were fixed in the privacy checker][1.6p] that
9287 could cause previously-accepted code to break.
9288 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9289 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9290 struct pattern syntax (`Foo(..)`) can no longer be used to match
9291 unit structs. This is a warning now, but will become an error in
9292 future releases. Patterns that share the same name as a const are
9294 * A bug was fixed that causes [rustc not to apply default type
9295 parameters][1.6xc] when resolving certain method implementations of
9296 traits defined in other crates.
9298 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9299 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9300 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9301 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9302 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9303 [1.6co]: http://doc.rust-lang.org/core/index.html
9304 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9305 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9306 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9307 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9308 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9309 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9310 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9311 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9312 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9313 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9314 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9315 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9316 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9317 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9318 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9319 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9320 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9321 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9322 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9323 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9324 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9325 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9326 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9327 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9328 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9329 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9330 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9331 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9332 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9333 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9334 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9335 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9336 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9337 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9338 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9339 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9340 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9341 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9342 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9343 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9344 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9347 Version 1.5.0 (2015-12-10)
9348 ==========================
9350 * ~700 changes, numerous bugfixes
9356 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9357 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9358 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9359 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9360 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9361 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9362 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9363 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9364 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9365 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9366 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9367 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9368 [`Path::read_link`], [`Path::symlink_metadata`],
9369 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9370 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9371 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9372 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9373 [`slice::split_first_mut`], [`slice::split_first`],
9374 [`slice::split_last_mut`], [`slice::split_last`],
9375 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9376 [`str::MatchIndices`], [`str::RMatchIndices`],
9377 [`str::match_indices`], [`str::rmatch_indices`],
9378 [`str::slice_mut_unchecked`], [`string::ParseError`].
9379 * Rust applications hosted on crates.io can be installed locally to
9380 `~/.cargo/bin` with the [`cargo install`] command. Among other
9381 things this makes it easier to augment Cargo with new subcommands:
9382 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9383 invoked as `cargo foo`.
9384 * Crates with wildcard (`*`) dependencies will [emit warnings when
9385 published][1.5w]. In 1.6 it will no longer be possible to publish
9386 crates with wildcard dependencies.
9391 * The rules determining when a particular lifetime must outlive
9392 a particular value (known as '[dropck]') have been [modified
9393 to not rely on parametricity][1.5p].
9394 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9395 and `Arc`][1.5a]. Because these smart pointer types implement
9396 `Deref`, this causes breakage in cases where the interior type
9397 contains methods of the same name.
9398 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9399 that they could drop their content. Soundness fix.
9400 * All method invocations are [properly checked][1.5wf1] for
9401 [well-formedness][1.5wf2]. Soundness fix.
9402 * Traits whose supertraits contain `Self` are [not object
9403 safe][1.5o]. Soundness fix.
9404 * Target specifications support a [`no_default_libraries`][1.5nd]
9405 setting that controls whether `-nodefaultlibs` is passed to the
9406 linker, and in turn the `is_like_windows` setting no longer affects
9407 the `-nodefaultlibs` flag.
9408 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9409 * The `#[inline]` and `#[repr]` attributes [can only appear
9410 in valid locations][1.5at].
9411 * Native libraries linked from the local crate are [passed to
9412 the linker before native libraries from upstream crates][1.5nl].
9413 * Two rarely-used attributes, `#[no_debug]` and
9414 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9415 * Negation of unsigned integers, which has been a warning for
9416 several releases, [is now behind a feature gate and will
9417 generate errors][1.5nu].
9418 * The parser accidentally accepted visibility modifiers on
9419 enum variants, a bug [which has been fixed][1.5ev].
9420 * [A bug was fixed that allowed `use` statements to import unstable
9426 * When evaluating expressions at compile-time that are not
9427 compile-time constants (const-evaluating expressions in non-const
9428 contexts), incorrect code such as overlong bitshifts and arithmetic
9429 overflow will [generate a warning instead of an error][1.5ce],
9430 delaying the error until runtime. This will allow the
9431 const-evaluator to be expanded in the future backwards-compatibly.
9432 * The `improper_ctypes` lint [no longer warns about using `isize` and
9433 `usize` in FFI][1.5ict].
9438 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9440 * `Default` is [implemented for mutable slices][1.5d].
9441 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9442 * There are now `From` conversions [between floating point
9443 types][1.5f] where the conversions are lossless.
9444 * There are now `From` conversions [between integer types][1.5i] where
9445 the conversions are lossless.
9446 * [`fs::Metadata` implements `Clone`][1.5fs].
9447 * The `parse` method [accepts a leading "+" when parsing
9449 * [`AsMut` is implemented for `Vec`][1.5am].
9450 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9451 been optimized][1.5cf] and no longer rely on the default impl.
9452 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9453 `unsafe extern "C"` function types now [implement `Clone`,
9454 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9455 `fmt::Debug` for up to 12 arguments][1.5fp].
9456 * [Dropping `Vec`s is much faster in unoptimized builds when the
9457 element types don't implement `Drop`][1.5dv].
9458 * A bug that caused in incorrect behavior when [combining `VecDeque`
9459 with zero-sized types][1.5vdz] was resolved.
9460 * [`PartialOrd` for slices is faster][1.5po].
9465 * [Crate metadata size was reduced by 20%][1.5md].
9466 * [Improvements to code generation reduced the size of libcore by 3.3
9467 MB and rustc's memory usage by 18MB][1.5m].
9468 * [Improvements to deref translation increased performance in
9469 unoptimized builds][1.5dr].
9470 * Various errors in trait resolution [are deduplicated to only be
9471 reported once][1.5te].
9472 * Rust has preliminary [support for rumprun kernels][1.5rr].
9473 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9475 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9476 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9477 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9478 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9479 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9480 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9481 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9482 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9483 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9484 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9485 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9486 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9487 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9488 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9489 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9490 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9491 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9492 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9493 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9494 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9495 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9496 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9497 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9498 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9499 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9500 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9501 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9502 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9503 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9504 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9505 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9506 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9507 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9508 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9509 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9510 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9511 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9512 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9513 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9514 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9515 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9516 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9517 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9518 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9519 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9520 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9521 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9522 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9523 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9524 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9525 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9526 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9527 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9528 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9529 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9530 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9531 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9532 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9533 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9534 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9535 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9536 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9537 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9538 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9539 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9540 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9541 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9542 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9543 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9544 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9545 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9546 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9547 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9548 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9549 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9550 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9551 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9552 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9553 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9554 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9555 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9556 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9557 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9558 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9559 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9560 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9561 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9562 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9563 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9565 Version 1.4.0 (2015-10-29)
9566 ==========================
9568 * ~1200 changes, numerous bugfixes
9573 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9574 GNU) are now supported and recommended for use.
9579 * [Several changes have been made to fix type soundness and improve
9580 the behavior of associated types][sound]. See [RFC 1214]. Although
9581 we have mostly introduced these changes as warnings this release, to
9582 become errors next release, there are still some scenarios that will
9583 see immediate breakage.
9584 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9585 line breaks in addition to `\n`][crlf].
9586 * [Loans of `'static` lifetime extend to the end of a function][stat].
9587 * [`str::parse` no longer introduces avoidable rounding error when
9588 parsing floating point numbers. Together with earlier changes to
9589 float formatting/output, "round trips" like f.to_string().parse()
9590 now preserve the value of f exactly. Additionally, leading plus
9591 signs are now accepted][fp3].
9597 * `use` statements that import multiple items [can now rename
9598 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9599 * [Binops work correctly on fat pointers][binfat].
9600 * `pub extern crate`, which does not behave as expected, [issues a
9601 warning][pec] until a better solution is found.
9606 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9607 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9608 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9609 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9610 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9611 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9612 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9613 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9614 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9615 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9616 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9617 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9618 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9619 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9620 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9621 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9622 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9623 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9625 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9626 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9627 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9628 `f64::from_str_radix`.
9629 * [Reverse-searching strings is faster with the 'two-way'
9631 * [`std::io::copy` allows `?Sized` arguments][cc].
9632 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9633 [override `count`, `nth` and `last` with an *O*(1)
9634 implementation][it].
9635 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9636 * [`IntoRawFd` has been added to the Unix-specific prelude,
9637 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9639 * [`Extend<String>` and `FromIterator<String` are both implemented for
9641 * [`IntoIterator` is implemented for references to `Option` and
9643 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9644 Copy`][ext] as part of [RFC 839]. This will cause type inference
9645 breakage in rare situations.
9646 * [`BinaryHeap` implements `Debug`][bh2].
9647 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9649 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9650 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9651 * [String comparison is faster][faststr].
9652 * `&mut T` where `T: std::fmt::Write` [also implements
9653 `std::fmt::Write`][mutw].
9654 * [A stable regression in `VecDeque::push_back` and other
9655 capacity-altering methods that caused panics for zero-sized types
9657 * [Function pointers implement traits for up to 12 parameters][fp2].
9662 * The compiler [no longer uses the 'morestack' feature to prevent
9663 stack overflow][mm]. Instead it uses guard pages and stack
9664 probes (though stack probes are not yet implemented on any platform
9666 * [The compiler matches traits faster when projections are involved][p].
9667 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9669 * [Cargo now displays useful information about what its doing during
9670 `cargo update`][cu].
9672 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9673 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9674 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9675 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9676 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9677 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9678 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9679 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9680 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9681 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9682 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9683 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9684 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9685 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9686 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9687 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9688 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9689 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9690 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9691 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9692 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9693 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9694 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9695 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9696 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9697 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9698 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9699 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9700 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9701 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9702 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9703 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9704 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9705 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9706 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9707 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9708 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9709 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9710 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9711 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9712 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9713 [bh2]: https://github.com/rust-lang/rust/pull/28156
9714 [binfat]: https://github.com/rust-lang/rust/pull/28270
9715 [bm]: https://github.com/rust-lang/rust/pull/28197
9716 [cc]: https://github.com/rust-lang/rust/pull/27531
9717 [crlf]: https://github.com/rust-lang/rust/pull/28034
9718 [cu]: https://github.com/rust-lang/cargo/pull/1931
9719 [d]: https://github.com/rust-lang/rust/pull/27825
9720 [dep]: https://github.com/rust-lang/rust/pull/28339
9721 [es]: https://github.com/rust-lang/rust/pull/27956
9722 [ext]: https://github.com/rust-lang/rust/pull/28094
9723 [faststr]: https://github.com/rust-lang/rust/pull/28338
9724 [ffi]: https://github.com/rust-lang/rust/pull/28779
9725 [fp]: https://github.com/rust-lang/rust/pull/28268
9726 [fp2]: https://github.com/rust-lang/rust/pull/28560
9727 [fp3]: https://github.com/rust-lang/rust/pull/27307
9728 [i]: https://github.com/rust-lang/rust/pull/27451
9729 [into2]: https://github.com/rust-lang/rust/pull/28039
9730 [it]: https://github.com/rust-lang/rust/pull/27652
9731 [mm]: https://github.com/rust-lang/rust/pull/27338
9732 [mutw]: https://github.com/rust-lang/rust/pull/28368
9733 [sound]: https://github.com/rust-lang/rust/pull/27641
9734 [p]: https://github.com/rust-lang/rust/pull/27866
9735 [pec]: https://github.com/rust-lang/rust/pull/28486
9736 [pr]: https://github.com/rust-lang/rust/pull/27896
9737 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9738 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9739 [s]: https://github.com/rust-lang/rust/pull/27474
9740 [stab]: https://github.com/rust-lang/rust/pull/28339
9741 [stat]: https://github.com/rust-lang/rust/pull/28321
9742 [vd]: https://github.com/rust-lang/rust/pull/28494
9744 Version 1.3.0 (2015-09-17)
9745 ==============================
9747 * ~900 changes, numerous bugfixes
9752 * The [new object lifetime defaults][nold] have been [turned
9753 on][nold2] after a cycle of warnings about the change. Now types
9754 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9755 being interpreted as `&'a Box<Trait+'a>` to `&'a
9756 Box<Trait+'static>`.
9757 * [The Rustonomicon][nom] is a new book in the official documentation
9758 that dives into writing unsafe Rust.
9759 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9760 timekeeping is employed by other std APIs, as well as out-of-tree
9766 * The [new object lifetime defaults][nold] have been [turned
9767 on][nold2] after a cycle of warnings about the change.
9768 * There is a known [regression][lr] in how object lifetime elision is
9769 interpreted, the proper solution for which is undetermined.
9770 * The `#[prelude_import]` attribute, an internal implementation
9771 detail, was accidentally stabilized previously. [It has been put
9772 behind the `prelude_import` feature gate][pi]. This change is
9773 believed to break no existing code.
9774 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9775 [more sane for dynamically sized types][dst3]. Code that relied on
9776 the previous behavior is thought to be broken.
9777 * The `dropck` rules, which checks that destructors can't access
9778 destroyed values, [have been updated][dropck] to match the
9779 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9780 cause some previously-compiling code to no longer build.
9785 * The [new object lifetime defaults][nold] have been [turned
9786 on][nold2] after a cycle of warnings about the change.
9787 * Semicolons may [now follow types and paths in
9788 macros](https://github.com/rust-lang/rust/pull/27000).
9789 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9790 [more sane for dynamically sized types][dst3]. Code that relied on
9791 the previous behavior is not known to exist, and suspected to be
9793 * `'static` variables [may now be recursive][st].
9794 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9795 implementations correctly.
9796 * The `dropck` rules, which checks that destructors can't access
9797 destroyed values, [have been updated][dropck] to match the
9803 * The [`Duration`] API, [has been stabilized][ds], as well as the
9804 `std::time` module, which presently contains only `Duration`.
9805 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9806 * The owned C string, [`CString`], implements [`Borrow`] and the
9807 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9808 these allow C strings to be borrowed and cloned in generic code.
9809 * [`CStr`] implements [`Debug`].
9810 * [`AtomicPtr`] implements [`Debug`].
9811 * [`Error`] trait objects [can be downcast to their concrete types][e]
9812 in many common configurations, using the [`is`], [`downcast`],
9813 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9815 * Searching for substrings now [employs the two-way algorithm][search]
9816 instead of doing a naive search. This gives major speedups to a
9817 number of methods, including [`contains`][sc], [`find`][sf],
9818 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9819 [`ends_with`][sew] are also faster.
9820 * The performance of `PartialEq` for slices is [much faster][ps].
9821 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9822 is overridden and optimized by the implementations for scalars.
9823 * The [`Hasher`] trait now has a number of specialized `write_*`
9824 methods for primitive types, for efficiency.
9825 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9826 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9827 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9828 of [`std::error::Error::cause`][iec] also delegates to the inner
9830 * [`process::Child`][pc] gained the [`id`] method, which returns a
9831 `u32` representing the platform-specific process identifier.
9832 * The [`connect`] method on slices is deprecated, replaced by the new
9833 [`join`] method (note that both of these are on the *unstable*
9834 [`SliceConcatExt`] trait, but through the magic of the prelude are
9835 available to stable code anyway).
9836 * The [`Div`] operator is implemented for [`Wrapping`] types.
9837 * [`DerefMut` is implemented for `String`][dms].
9838 * Performance of SipHash (the default hasher for `HashMap`) is
9839 [better for long data][sh].
9840 * [`AtomicPtr`] implements [`Send`].
9841 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9842 are now [specialized to use uninitialized buffers for increased
9844 * Lifetime parameters of foreign functions [are now resolved
9850 * Rust can now, with some coercion, [produce programs that run on
9851 Windows XP][xp], though XP is not considered a supported platform.
9852 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9853 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9854 recommended for use in 1.3, though should be fully-functional
9855 in the [64-bit 1.4 beta][b14].
9856 * On Fedora-based systems installation will [properly configure the
9857 dynamic linker][fl].
9858 * The compiler gained many new extended error descriptions, which can
9859 be accessed with the `--explain` flag.
9860 * The `dropck` pass, which checks that destructors can't access
9861 destroyed values, [has been rewritten][27261]. This fixes some
9862 soundness holes, and as such will cause some previously-compiling
9863 code to no longer build.
9864 * `rustc` now uses [LLVM to write archive files where possible][ar].
9865 Eventually this will eliminate the compiler's dependency on the ar
9867 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9868 supported FreeBSD on x86_64).
9869 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9870 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9872 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9873 will kill the process instead of leaking][nlp].
9875 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9876 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9877 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9878 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9879 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9880 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9881 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9882 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9883 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9884 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9885 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9886 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9887 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9888 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9889 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9890 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9891 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9892 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9893 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9894 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9895 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9896 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9897 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9898 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9899 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9900 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9901 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9902 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9903 [ar]: https://github.com/rust-lang/rust/pull/26926
9904 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9905 [dms]: https://github.com/rust-lang/rust/pull/26241
9906 [27261]: https://github.com/rust-lang/rust/pull/27261
9907 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9908 [ds]: https://github.com/rust-lang/rust/pull/26818
9909 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9910 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9911 [dst3]: https://github.com/rust-lang/rust/pull/27351
9912 [e]: https://github.com/rust-lang/rust/pull/24793
9913 [f]: https://github.com/rust-lang/rust/pull/26588
9914 [26959]: https://github.com/rust-lang/rust/pull/26959
9915 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9916 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9917 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9918 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9919 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9920 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9921 [lic]: https://github.com/rust-lang/rust/pull/26583
9922 [lnu]: https://github.com/rust-lang/rust/pull/27026
9923 [lr]: https://github.com/rust-lang/rust/issues/27248
9924 [lum]: https://github.com/rust-lang/rust/pull/26378
9925 [lur]: https://github.com/rust-lang/rust/pull/26783
9926 [nlp]: https://github.com/rust-lang/rust/pull/27176
9927 [nold2]: https://github.com/rust-lang/rust/pull/27045
9928 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9929 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9930 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9931 [pi]: https://github.com/rust-lang/rust/pull/26699
9932 [ps]: https://github.com/rust-lang/rust/pull/26884
9933 [rte]: https://github.com/rust-lang/rust/pull/26950
9934 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9935 [search]: https://github.com/rust-lang/rust/pull/26327
9936 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9937 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9938 [sh]: https://github.com/rust-lang/rust/pull/27280
9939 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9940 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9941 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9942 [st]: https://github.com/rust-lang/rust/pull/26630
9943 [win1]: https://github.com/rust-lang/rust/pull/26569
9944 [win2]: https://github.com/rust-lang/rust/pull/26741
9945 [win3]: https://github.com/rust-lang/rust/pull/26741
9946 [win4]: https://github.com/rust-lang/rust/pull/27210
9947 [xp]: https://github.com/rust-lang/rust/pull/26569
9949 Version 1.2.0 (2015-08-07)
9950 ==========================
9952 * ~1200 changes, numerous bugfixes
9957 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9958 like `Rc` to contain types without a fixed size, arrays and trait
9959 objects, finally enabling use of `Rc<[T]>` and completing the
9960 implementation of DST.
9961 * [Parallel codegen][parcodegen] is now working again, which can
9962 substantially speed up large builds in debug mode; It also gets
9963 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9964 jobs). It's not enabled by default, but will be "in the near
9965 future". It can be activated with the `-C codegen-units=N` flag to
9967 * This is the first release with [experimental support for linking
9968 with the MSVC linker and lib C on Windows (instead of using the GNU
9969 variants via MinGW)][win]. It is yet recommended only for the most
9970 intrepid Rustaceans.
9971 * Benchmark compilations are showing a 30% improvement in
9972 bootstrapping over 1.1.
9977 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9978 unicode case mapping, which is a previously-planned change in
9979 behavior and considered a bugfix.
9980 * [`mem::align_of`] now specifies [the *minimum alignment* for
9981 T][align], which is usually the alignment programs are interested
9982 in, and the same value reported by clang's
9983 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9985 * [The `#[packed]` attribute is no longer silently accepted by the
9986 compiler][packed]. This attribute did nothing and code that
9987 mentioned it likely did not work as intended.
9988 * Associated type defaults are [now behind the
9989 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9990 defaults *did not work*, but could be mentioned syntactically. As
9991 such this breakage has minimal impact.
9996 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9997 matching against dereferenceable values.
10002 * The [`Extend`] trait, which grows a collection from an iterator, is
10003 implemented over iterators of references, for `String`, `Vec`,
10004 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
10005 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
10006 * The [`iter::once`] function returns an iterator that yields a single
10007 element, and [`iter::empty`] returns an iterator that yields no
10009 * The [`matches`] and [`rmatches`] methods on `str` return iterators
10010 over substring matches.
10011 * [`Cell`] and [`RefCell`] both implement `Eq`.
10012 * A number of methods for wrapping arithmetic are added to the
10013 integral types, [`wrapping_div`], [`wrapping_rem`],
10014 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10015 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10016 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10017 type.. It is illegal for the default arithmetic operations in Rust
10018 to overflow; the desire to wrap must be explicit.
10019 * The `{:#?}` formatting specifier [displays the alternate,
10020 pretty-printed][debugfmt] form of the `Debug` formatter. This
10021 feature was actually introduced prior to 1.0 with little
10023 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10024 for writing data to formatted strings, similar to [`io::Write`].
10025 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10026 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10027 are used by code generators to emit implementations of [`Debug`].
10028 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10029 methods that convert case, following Unicode case mapping.
10030 * It is now easier to handle poisoned locks. The [`PoisonError`]
10031 type, returned by failing lock operations, exposes `into_inner`,
10032 `get_ref`, and `get_mut`, which all give access to the inner lock
10033 guard, and allow the poisoned lock to continue to operate. The
10034 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10035 poisoned lock without attempting to take the lock.
10036 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10037 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10038 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10039 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10041 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10047 * `rustc` employs smarter heuristics for guessing at [typos].
10048 * `rustc` emits more efficient code for [no-op conversions between
10049 unsafe pointers][nop].
10050 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10051 resulting in faster compile times and smaller code.
10053 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10054 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10055 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10056 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10057 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10058 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10059 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10060 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10061 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10062 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10063 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10064 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10065 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10066 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10067 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10068 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10069 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10070 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10071 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10072 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10073 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10074 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10075 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10076 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10077 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10078 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10079 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10080 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10081 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10082 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10083 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10084 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10085 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10086 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10087 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10088 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10089 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10090 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10091 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10092 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10093 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10094 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10095 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10096 [align]: https://github.com/rust-lang/rust/pull/25646
10097 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10098 [typos]: https://github.com/rust-lang/rust/pull/26087
10099 [nop]: https://github.com/rust-lang/rust/pull/26336
10100 [fat]: https://github.com/rust-lang/rust/pull/26411
10101 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10102 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10103 [packed]: https://github.com/rust-lang/rust/pull/25541
10104 [ad]: https://github.com/rust-lang/rust/pull/27382
10105 [win]: https://github.com/rust-lang/rust/pull/25350
10107 Version 1.1.0 (2015-06-25)
10108 =========================
10110 * ~850 changes, numerous bugfixes
10115 * The [`std::fs` module has been expanded][fs] to expand the set of
10116 functionality exposed:
10117 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10118 don't incur a syscall on some platforms.
10119 * A `symlink_metadata` function has been added.
10120 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10121 access to all underlying information.
10122 * The compiler now contains extended explanations of many errors. When an error
10123 with an explanation occurs the compiler suggests using the `--explain` flag
10124 to read the explanation. Error explanations are also [available online][err-index].
10125 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10126 well as other work, the time to bootstrap the compiler decreased by
10132 * The [`str::split_whitespace`] method splits a string on unicode
10133 whitespace boundaries.
10134 * On both Windows and Unix, new extension traits provide conversion of
10135 I/O types to and from the underlying system handles. On Unix, these
10136 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10137 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10138 `TcpListener`, and `UpdSocket`. Further implementations for
10139 `std::process` will be stabilized later.
10140 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10141 Windows, symlinks can be created with
10142 `std::os::windows::symlink_dir` and
10143 `std::os::windows::symlink_file`.
10144 * The `mpsc::Receiver` type can now be converted into an iterator with
10145 `into_iter` on the [`IntoIterator`] trait.
10146 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10147 implementation of the [`From`] trait.
10148 * The `Debug` implementation for `RangeFull` [creates output that is
10149 more consistent with other implementations][rf].
10150 * [`Debug` is implemented for `File`][file].
10151 * The `Default` implementation for `Arc` [no longer requires `Sync +
10153 * [The `Iterator` methods `count`, `nth`, and `last` have been
10154 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10155 * Incorrect handling of paths on Windows has been improved in both the
10156 compiler and the standard library.
10157 * [`AtomicPtr` gained a `Default` implementation][ap].
10158 * In accordance with Rust's policy on arithmetic overflow `abs` now
10159 [panics on overflow when debug assertions are enabled][abs].
10160 * The [`Cloned`] iterator, which was accidentally left unstable for
10161 1.0 [has been stabilized][c].
10162 * The [`Incoming`] iterator, which iterates over incoming TCP
10163 connections, and which was accidentally unnamable in 1.0, [is now
10164 properly exported][inc].
10165 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10166 `sift_up` or `sift_down` panic][bh].
10167 * The [`split_off`] method of `LinkedList` [no longer corrupts
10168 the list in certain scenarios][ll].
10173 * Type checking performance [has improved notably][sk] with
10174 [multiple improvements][pre].
10175 * The compiler [suggests code changes][ch] for more errors.
10176 * rustc and it's build system have experimental support for [building
10177 toolchains against MUSL][m] instead of glibc on Linux.
10178 * The compiler defines the `target_env` cfg value, which is used for
10179 distinguishing toolchains that are otherwise for the same
10180 platform. Presently this is set to `gnu` for common GNU Linux
10181 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10182 * The [`cargo rustc`][crc] command invokes a build with custom flags
10184 * [Android executables are always position independent][pie].
10185 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10186 with `Drop`][24935].
10188 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10189 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10190 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10191 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10192 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10193 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10194 [rf]: https://github.com/rust-lang/rust/pull/24491
10195 [err-index]: https://doc.rust-lang.org/error-index.html
10196 [sk]: https://github.com/rust-lang/rust/pull/24615
10197 [pre]: https://github.com/rust-lang/rust/pull/25323
10198 [file]: https://github.com/rust-lang/rust/pull/24598
10199 [ch]: https://github.com/rust-lang/rust/pull/24683
10200 [arc]: https://github.com/rust-lang/rust/pull/24695
10201 [si]: https://github.com/rust-lang/rust/pull/24701
10202 [ap]: https://github.com/rust-lang/rust/pull/24834
10203 [m]: https://github.com/rust-lang/rust/pull/24777
10204 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10205 [crc]: https://github.com/rust-lang/cargo/pull/1568
10206 [pie]: https://github.com/rust-lang/rust/pull/24953
10207 [abs]: https://github.com/rust-lang/rust/pull/25441
10208 [c]: https://github.com/rust-lang/rust/pull/25496
10209 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10210 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10211 [inc]: https://github.com/rust-lang/rust/pull/25522
10212 [bh]: https://github.com/rust-lang/rust/pull/25856
10213 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10214 [ll]: https://github.com/rust-lang/rust/pull/26022
10215 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10216 [24935]: https://github.com/rust-lang/rust/pull/24935
10218 Version 1.0.0 (2015-05-15)
10219 ========================
10221 * ~1500 changes, numerous bugfixes
10226 * The vast majority of the standard library is now `#[stable]`. It is
10227 no longer possible to use unstable features with a stable build of
10229 * Many popular crates on [crates.io] now work on the stable release
10231 * Arithmetic on basic integer types now [checks for overflow in debug
10237 * Several [restrictions have been added to trait coherence][coh] in
10238 order to make it easier for upstream authors to change traits
10239 without breaking downstream code.
10240 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10241 improve error messages and macro behavior. For example, `0b1234` is
10242 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10243 * Trait bounds [are always invariant][inv], eliminating the need for
10244 the `PhantomFn` and `MarkerTrait` lang items, which have been
10246 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10247 "foo" as bar` syntax has been replaced with `extern crate foo as
10248 bar`, and Cargo now automatically translates "-" in *package* names
10249 to underscore for the crate name.
10250 * [Lifetime shadowing is an error][lt].
10251 * [`Send` no longer implies `'static`][send-rfc].
10252 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10253 `MyType::default()`.
10254 * Primitive types [now have inherent methods][prim-inherent],
10255 obviating the need for extension traits like `SliceExt`.
10256 * Methods with `Self: Sized` in their `where` clause are [considered
10257 object-safe][self-sized], allowing many extension traits like
10258 `IteratorExt` to be merged into the traits they extended.
10259 * You can now [refer to associated types][assoc-where] whose
10260 corresponding trait bounds appear only in a `where` clause.
10261 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10262 like `Send` and `Sync` are now library-defined.
10263 * A [Reflect trait][reflect] was introduced, which means that
10264 downcasting via the `Any` trait is effectively limited to concrete
10265 types. This helps retain the potentially-important "parametricity"
10266 property: generic code cannot behave differently for different type
10267 arguments except in minor ways.
10268 * The `unsafe_destructor` feature is now deprecated in favor of the
10269 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10275 * The `thread_local` module [has been renamed to `std::thread`][th].
10276 * The methods of `IteratorExt` [have been moved to the `Iterator`
10277 trait itself][23300].
10278 * Several traits that implement Rust's conventions for type
10279 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10280 [centralized in the `std::convert` module][con].
10281 * The `FromError` trait [was removed in favor of `From`][fe].
10282 * The basic sleep function [has moved to
10283 `std::thread::sleep_ms`][slp].
10284 * The `splitn` function now takes an `n` parameter that represents the
10285 number of items yielded by the returned iterator [instead of the
10286 number of 'splits'][spl].
10287 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10288 * [Derived implementations of `PartialOrd` now order enums according
10289 to their explicitly-assigned discriminants][po].
10290 * [Methods for searching strings are generic over `Pattern`s][pat],
10291 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10293 * [In method resolution, object methods are resolved before inherent
10295 * [`String::from_str` has been deprecated in favor of the `From` impl,
10296 `String::from`][24517].
10297 * [`io::Error` implements `Sync`][ios].
10298 * [The `words` method on `&str` has been replaced with
10299 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10301 * The new path and IO modules are complete and `#[stable]`. This
10302 was the major library focus for this cycle.
10303 * The path API was [revised][path-normalize] to normalize `.`,
10304 adjusting the tradeoffs in favor of the most common usage.
10305 * A large number of remaining APIs in `std` were also stabilized
10306 during this cycle; about 75% of the non-deprecated API surface
10308 * The new [string pattern API][string-pattern] landed, which makes
10309 the string slice API much more internally consistent and flexible.
10310 * A new set of [generic conversion traits][conversion] replaced
10311 many existing ad hoc traits.
10312 * Generic numeric traits were [completely removed][num-traits]. This
10313 was made possible thanks to inherent methods for primitive types,
10314 and the removal gives maximal flexibility for designing a numeric
10315 hierarchy in the future.
10316 * The `Fn` traits are now related via [inheritance][fn-inherit]
10317 and provide ergonomic [blanket implementations][fn-blanket].
10318 * The `Index` and `IndexMut` traits were changed to
10319 [take the index by value][index-value], enabling code like
10320 `hash_map["string"]` to work.
10321 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10322 `Copy` data is known to be `Clone` as well.
10327 * Many errors now have extended explanations that can be accessed with
10328 the `--explain` flag to `rustc`.
10329 * Many new examples have been added to the standard library
10331 * rustdoc has received a number of improvements focused on completion
10333 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10334 * Much headway was made on ecosystem-wide CI, making it possible
10335 to [compare builds for breakage][ci-compare].
10338 [crates.io]: http://crates.io
10339 [clo]: https://github.com/rust-lang/rust/pull/24034
10340 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10341 [con]: https://github.com/rust-lang/rust/pull/23875
10342 [cr]: https://github.com/rust-lang/rust/pull/23419
10343 [fe]: https://github.com/rust-lang/rust/pull/23879
10344 [23300]: https://github.com/rust-lang/rust/pull/23300
10345 [inv]: https://github.com/rust-lang/rust/pull/23938
10346 [ios]: https://github.com/rust-lang/rust/pull/24133
10347 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10348 [lt]: https://github.com/rust-lang/rust/pull/24057
10349 [meth]: https://github.com/rust-lang/rust/pull/24056
10350 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10351 [po]: https://github.com/rust-lang/rust/pull/24270
10352 [24517]: https://github.com/rust-lang/rust/pull/24517
10353 [slp]: https://github.com/rust-lang/rust/pull/23949
10354 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10355 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10356 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10357 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10358 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10359 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10360 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10361 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10362 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10363 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10364 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10365 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10366 [reflect]: https://github.com/rust-lang/rust/pull/23712
10367 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10368 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10369 [index-value]: https://github.com/rust-lang/rust/pull/23601
10370 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10371 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10372 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10373 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10374 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10375 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10378 Version 1.0.0-alpha.2 (2015-02-20)
10379 =====================================
10381 * ~1300 changes, numerous bugfixes
10385 * The various I/O modules were [overhauled][io-rfc] to reduce
10386 unnecessary abstractions and provide better interoperation with
10387 the underlying platform. The old `io` module remains temporarily
10389 * The standard library now [participates in feature gating][feat],
10390 so use of unstable libraries now requires a `#![feature(...)]`
10391 attribute. The impact of this change is [described on the
10392 forum][feat-forum]. [RFC][feat-rfc].
10396 * `for` loops [now operate on the `IntoIterator` trait][into],
10397 which eliminates the need to call `.iter()`, etc. to iterate
10398 over collections. There are some new subtleties to remember
10399 though regarding what sort of iterators various types yield, in
10400 particular that `for foo in bar { }` yields values from a move
10401 iterator, destroying the original collection. [RFC][into-rfc].
10402 * Objects now have [default lifetime bounds][obj], so you don't
10403 have to write `Box<Trait+'static>` when you don't care about
10404 storing references. [RFC][obj-rfc].
10405 * In types that implement `Drop`, [lifetimes must outlive the
10406 value][drop]. This will soon make it possible to safely
10407 implement `Drop` for types where `#[unsafe_destructor]` is now
10408 required. Read the [gorgeous RFC][drop-rfc] for details.
10409 * The fully qualified <T as Trait>::X syntax lets you set the Self
10410 type for a trait method or associated type. [RFC][ufcs-rfc].
10411 * References to types that implement `Deref<U>` now [automatically
10412 coerce to references][deref] to the dereferenced type `U`,
10413 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10414 should eliminate many unsightly uses of `&*`, as when converting
10415 from references to vectors into references to
10416 slices. [RFC][deref-rfc].
10417 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10418 `|:|`) is obsolete and closure kind is inferred from context.
10419 * [`Self` is a keyword][Self].
10423 * The `Show` and `String` formatting traits [have been
10424 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10425 their related purposes. Automatically getting a string
10426 conversion to use with `format!("{:?}", something_to_debug)` is
10427 now written `#[derive(Debug)]`.
10428 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10429 OsStr}`, provide strings in platform-specific encodings for easier
10430 interop with system APIs. [RFC][osstr-rfc].
10431 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10432 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10433 creating raw pointers.
10437 * Certain long error messages of the form 'expected foo found bar'
10438 are now [split neatly across multiple
10439 lines][multiline]. Examples in the PR.
10440 * On Unix Rust can be [uninstalled][un] by running
10441 `/usr/local/lib/rustlib/uninstall.sh`.
10442 * The `#[rustc_on_unimplemented]` attribute, requiring the
10443 'on_unimplemented' feature, lets rustc [display custom error
10444 messages when a trait is expected to be implemented for a type
10449 * Rust is tested against a [LALR grammar][lalr], which parses
10450 almost all the Rust files that rustc does.
10452 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10453 [close]: https://github.com/rust-lang/rust/pull/21843
10454 [deref]: https://github.com/rust-lang/rust/pull/21351
10455 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10456 [drop]: https://github.com/rust-lang/rust/pull/21972
10457 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10458 [feat]: https://github.com/rust-lang/rust/pull/21248
10459 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10460 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10461 [fmt]: https://github.com/rust-lang/rust/pull/21457
10462 [into]: https://github.com/rust-lang/rust/pull/20790
10463 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10464 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10465 [lalr]: https://github.com/rust-lang/rust/pull/21452
10466 [multiline]: https://github.com/rust-lang/rust/pull/19870
10467 [obj]: https://github.com/rust-lang/rust/pull/22230
10468 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10469 [onun]: https://github.com/rust-lang/rust/pull/20889
10470 [osstr]: https://github.com/rust-lang/rust/pull/21488
10471 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10472 [Self]: https://github.com/rust-lang/rust/pull/22158
10473 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10474 [un]: https://github.com/rust-lang/rust/pull/22256
10477 Version 1.0.0-alpha (2015-01-09)
10478 ==================================
10480 * ~2400 changes, numerous bugfixes
10484 * The language itself is considered feature complete for 1.0,
10485 though there will be many usability improvements and bugfixes
10486 before the final release.
10487 * Nearly 50% of the public API surface of the standard library has
10488 been declared 'stable'. Those interfaces are unlikely to change
10490 * The long-running debate over integer types has been
10491 [settled][ints]: Rust will ship with types named `isize` and
10492 `usize`, rather than `int` and `uint`, for pointer-sized
10493 integers. Guidelines will be rolled out during the alpha cycle.
10494 * Most crates that are not `std` have been moved out of the Rust
10495 distribution into the Cargo ecosystem so they can evolve
10496 separately and don't need to be stabilized as quickly, including
10497 'time', 'getopts', 'num', 'regex', and 'term'.
10498 * Documentation continues to be expanded with more API coverage, more
10499 examples, and more in-depth explanations. The guides have been
10500 consolidated into [The Rust Programming Language][trpl].
10501 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10502 * All official Rust binary installers now come with [Cargo], the
10503 Rust package manager.
10507 * Closures have been [completely redesigned][unboxed] to be
10508 implemented in terms of traits, can now be used as generic type
10509 bounds and thus monomorphized and inlined, or via an opaque
10510 pointer (boxed) as in the old system. The new system is often
10511 referred to as 'unboxed' closures.
10512 * Traits now support [associated types][assoc], allowing families
10513 of related types to be defined together and used generically in
10515 * Enum variants are [namespaced by their type names][enum].
10516 * [`where` clauses][where] provide a more versatile and attractive
10517 syntax for specifying generic bounds, though the previous syntax
10519 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10521 * Rust [no longer has a runtime][rt] of any description, and only
10522 supports OS threads, not green threads.
10523 * At long last, Rust has been overhauled for 'dynamically-sized
10524 types' ([DST]), which integrates 'fat pointers' (object types,
10525 arrays, and `str`) more deeply into the type system, making it
10527 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10528 `..j` that produce range types and which, when combined with the
10529 `Index` operator and multidispatch, leads to a convenient slice
10530 notation, `[i..j]`.
10531 * The new range syntax revealed an ambiguity in the fixed-length
10532 array syntax, so now fixed length arrays [are written `[T;
10534 * The `Copy` trait is no longer implemented automatically. Unsafe
10535 pointers no longer implement `Sync` and `Send` so types
10536 containing them don't automatically either. `Sync` and `Send`
10537 are now 'unsafe traits' so one can "forcibly" implement them via
10538 `unsafe impl` if a type confirms to the requirements for them
10539 even though the internals do not (e.g. structs containing unsafe
10540 pointers like `Arc`). These changes are intended to prevent some
10541 footguns and are collectively known as [opt-in built-in
10542 traits][oibit] (though `Sync` and `Send` will soon become pure
10543 library types unknown to the compiler).
10544 * Operator traits now take their operands [by value][ops], and
10545 comparison traits can use multidispatch to compare one type
10546 against multiple other types, allowing e.g. `String` to be
10547 compared with `&str`.
10548 * `if let` and `while let` are no longer feature-gated.
10549 * Rust has adopted a more [uniform syntax for escaping unicode
10550 characters][unicode].
10551 * `macro_rules!` [has been declared stable][mac]. Though it is a
10552 flawed system it is sufficiently popular that it must be usable
10553 for 1.0. Effort has gone into [future-proofing][mac-future] it
10554 in ways that will allow other macro systems to be developed in
10555 parallel, and won't otherwise impact the evolution of the
10557 * The prelude has been [pared back significantly][prelude] such
10558 that it is the minimum necessary to support the most pervasive
10559 code patterns, and through [generalized where clauses][where]
10560 many of the prelude extension traits have been consolidated.
10561 * Rust's rudimentary reflection [has been removed][refl], as it
10562 incurred too much code generation for little benefit.
10563 * [Struct variants][structvars] are no longer feature-gated.
10564 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10565 known as 'higher-ranked trait bounds', this crucially allows
10566 unboxed closures to work.
10567 * Macros invocations surrounded by parens or square brackets and
10568 not terminated by a semicolon are [parsed as
10569 expressions][macros], which makes expressions like `vec![1i32,
10570 2, 3].len()` work as expected.
10571 * Trait objects now implement their traits automatically, and
10572 traits that can be coerced to objects now must be [object
10574 * Automatically deriving traits is now done with `#[derive(...)]`
10575 not `#[deriving(...)]` for [consistency with other naming
10576 conventions][derive].
10577 * Importing the containing module or enum at the same time as
10578 items or variants they contain is [now done with `self` instead
10579 of `mod`][self], as in use `foo::{self, bar}`
10580 * Glob imports are no longer feature-gated.
10581 * The `box` operator and `box` patterns have been feature-gated
10582 pending a redesign. For now unique boxes should be allocated
10583 like other containers, with `Box::new`.
10587 * A [series][coll1] of [efforts][coll2] to establish
10588 [conventions][coll3] for collections types has resulted in API
10589 improvements throughout the standard library.
10590 * New [APIs for error handling][err] provide ergonomic interop
10591 between error types, and [new conventions][err-conv] describe
10592 more clearly the recommended error handling strategies in Rust.
10593 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10594 it is easier to discuss failure in the context of error handling
10595 without making clarifications as to whether you are referring to
10596 the 'fail' macro or failure more generally.
10597 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10598 syscall when available.
10599 * The 'serialize' crate has been renamed 'rustc-serialize' and
10600 moved out of the distribution to Cargo. Although it is widely
10601 used now, it is expected to be superseded in the near future.
10602 * The `Show` formatter, typically implemented with
10603 `#[derive(Show)]` is [now requested with the `{:?}`
10604 specifier][show] and is intended for use by all types, for uses
10605 such as `println!` debugging. The new `String` formatter must be
10606 implemented by hand, uses the `{}` specifier, and is intended
10607 for full-fidelity conversions of things that can logically be
10608 represented as strings.
10612 * [Flexible target specification][flex] allows rustc's code
10613 generation to be configured to support otherwise-unsupported
10615 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10616 respective debuggers with Rust-appropriate pretty-printing.
10617 * The Windows installation of Rust is distributed with the
10618 MinGW components currently required to link binaries on that
10623 * Nullable enum optimizations have been extended to more types so
10624 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10625 space than the inner types themselves.
10626 * Work has begun on supporting AArch64.
10628 [Cargo]: https://crates.io
10629 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10630 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10631 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10632 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10633 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10634 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10635 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10636 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10637 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10638 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10639 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10640 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10641 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10642 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10643 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10644 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10645 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10646 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10647 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10648 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10649 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10650 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10651 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10652 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10653 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10654 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10655 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10656 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10657 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10658 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10659 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10660 [trpl]: https://doc.rust-lang.org/book/index.html
10661 [rbe]: http://rustbyexample.com/
10664 Version 0.12.0 (2014-10-09)
10665 =============================
10667 * ~1900 changes, numerous bugfixes
10671 * The introductory documentation (now called The Rust Guide) has
10672 been completely rewritten, as have a number of supplementary
10674 * Rust's package manager, Cargo, continues to improve and is
10675 sometimes considered to be quite awesome.
10676 * Many API's in `std` have been reviewed and updated for
10677 consistency with the in-development Rust coding
10678 guidelines. The standard library documentation tracks
10679 stabilization progress.
10680 * Minor libraries have been moved out-of-tree to the rust-lang org
10681 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10682 be installed with Cargo.
10683 * Lifetime elision allows lifetime annotations to be left off of
10684 function declarations in many common scenarios.
10685 * Rust now works on 64-bit Windows.
10688 * Indexing can be overloaded with the `Index` and `IndexMut`
10690 * The `if let` construct takes a branch only if the `let` pattern
10691 matches, currently behind the 'if_let' feature gate.
10692 * 'where clauses', a more flexible syntax for specifying trait
10693 bounds that is more aesthetic, have been added for traits and
10694 free functions. Where clauses will in the future make it
10695 possible to constrain associated types, which would be
10696 impossible with the existing syntax.
10697 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10698 the 'slicing_syntax' feature gate, and can be overloaded with
10699 the `Slice` or `SliceMut` traits.
10700 * The syntax for matching of sub-slices has been changed to use a
10701 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10702 consistency with other uses of `..` and to future-proof
10703 potential additional uses of the syntax.
10704 * The syntax for matching inclusive ranges in patterns has changed
10705 from `0..3` to `0...4` to be consistent with the exclusive range
10706 syntax for slicing.
10707 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10708 c]`) has been put behind the 'advanced_slice_patterns' feature
10709 gate and may be removed in the future.
10710 * Components of tuples and tuple structs can be extracted using
10711 the `value.0` syntax, currently behind the `tuple_indexing`
10713 * The `#[crate_id]` attribute is no longer supported; versioning
10714 is handled by the package manager.
10715 * Renaming crate imports are now written `extern crate foo as bar`
10716 instead of `extern crate bar = foo`.
10717 * Renaming use statements are now written `use foo as bar` instead
10718 of `use bar = foo`.
10719 * `let` and `match` bindings and argument names in macros are now
10721 * The new, more efficient, closure types ('unboxed closures') have
10722 been added under a feature gate, 'unboxed_closures'. These will
10723 soon replace the existing closure types, once higher-ranked
10724 trait lifetimes are added to the language.
10725 * `move` has been added as a keyword, for indicating closures
10726 that capture by value.
10727 * Mutation and assignment is no longer allowed in pattern guards.
10728 * Generic structs and enums can now have trait bounds.
10729 * The `Share` trait is now called `Sync` to free up the term
10730 'shared' to refer to 'shared reference' (the default reference
10732 * Dynamically-sized types have been mostly implemented,
10733 unifying the behavior of fat-pointer types with the rest of the
10735 * As part of dynamically-sized types, the `Sized` trait has been
10736 introduced, which qualifying types implement by default, and
10737 which type parameters expect by default. To specify that a type
10738 parameter does not need to be sized, write `<Sized? T>`. Most
10739 types are `Sized`, notable exceptions being unsized arrays
10740 (`[T]`) and trait types.
10741 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10742 * Lifetime bounds can now be applied to type parameters and object
10744 * The old, reference counted GC type, `Gc<T>` which was once
10745 denoted by the `@` sigil, has finally been removed. GC will be
10746 revisited in the future.
10749 * Library documentation has been improved for a number of modules.
10750 * Bit-vectors, collections::bitv has been modernized.
10751 * The url crate is deprecated in favor of
10752 http://github.com/servo/rust-url, which can be installed with
10754 * Most I/O stream types can be cloned and subsequently closed from
10755 a different thread.
10756 * A `std::time::Duration` type has been added for use in I/O
10757 methods that rely on timers, as well as in the 'time' crate's
10758 `Timespec` arithmetic.
10759 * The runtime I/O abstraction layer that enabled the green thread
10760 scheduler to do non-thread-blocking I/O has been removed, along
10761 with the libuv-based implementation employed by the green thread
10762 scheduler. This will greatly simplify the future I/O work.
10763 * `collections::btree` has been rewritten to have a more
10764 idiomatic and efficient design.
10767 * rustdoc output now indicates the stability levels of API's.
10768 * The `--crate-name` flag can specify the name of the crate
10769 being compiled, like `#[crate_name]`.
10770 * The `-C metadata` specifies additional metadata to hash into
10771 symbol names, and `-C extra-filename` specifies additional
10772 information to put into the output filename, for use by the
10773 package manager for versioning.
10774 * debug info generation has continued to improve and should be
10775 more reliable under both gdb and lldb.
10776 * rustc has experimental support for compiling in parallel
10777 using the `-C codegen-units` flag.
10778 * rustc no longer encodes rpath information into binaries by
10782 * Stack usage has been optimized with LLVM lifetime annotations.
10783 * Official Rust binaries on Linux are more compatible with older
10784 kernels and distributions, built on CentOS 5.10.
10787 Version 0.11.0 (2014-07-02)
10788 ==========================
10790 * ~1700 changes, numerous bugfixes
10793 * ~[T] has been removed from the language. This type is superseded by
10795 * ~str has been removed from the language. This type is superseded by
10797 * ~T has been removed from the language. This type is superseded by the
10799 * @T has been removed from the language. This type is superseded by the
10800 standard library's std::gc::Gc<T> type.
10801 * Struct fields are now all private by default.
10802 * Vector indices and shift amounts are both required to be a `uint`
10803 instead of any integral type.
10804 * Byte character, byte string, and raw byte string literals are now all
10805 supported by prefixing the normal literal with a `b`.
10806 * Multiple ABIs are no longer allowed in an ABI string
10807 * The syntax for lifetimes on closures/procedures has been tweaked
10808 slightly: `<'a>|A, B|: 'b + K -> T`
10809 * Floating point modulus has been removed from the language; however it
10810 is still provided by a library implementation.
10811 * Private enum variants are now disallowed.
10812 * The `priv` keyword has been removed from the language.
10813 * A closure can no longer be invoked through a &-pointer.
10814 * The `use foo, bar, baz;` syntax has been removed from the language.
10815 * The transmute intrinsic no longer works on type parameters.
10816 * Statics now allow blocks/items in their definition.
10817 * Trait bounds are separated from objects with + instead of : now.
10818 * Objects can no longer be read while they are mutably borrowed.
10819 * The address of a static is now marked as insignificant unless the
10820 #[inline(never)] attribute is placed it.
10821 * The #[unsafe_destructor] attribute is now behind a feature gate.
10822 * Struct literals are no longer allowed in ambiguous positions such as
10823 if, while, match, and for..in.
10824 * Declaration of lang items and intrinsics are now feature-gated by
10826 * Integral literals no longer default to `int`, and floating point
10827 literals no longer default to `f64`. Literals must be suffixed with an
10828 appropriate type if inference cannot determine the type of the
10830 * The Box<T> type is no longer implicitly borrowed to &mut T.
10831 * Procedures are now required to not capture borrowed references.
10834 * The standard library is now a "facade" over a number of underlying
10835 libraries. This means that development on the standard library should
10836 be speedier due to smaller crates, as well as a clearer line between
10838 * A new library, libcore, lives under the standard library's facade
10839 which is Rust's "0-assumption" library, suitable for embedded and
10840 kernel development for example.
10841 * A regex crate has been added to the standard distribution. This crate
10842 includes statically compiled regular expressions.
10843 * The unwrap/unwrap_err methods on Result require a Show bound for
10844 better error messages.
10845 * The return types of the std::comm primitives have been centralized
10846 around the Result type.
10847 * A number of I/O primitives have gained the ability to time out their
10849 * A number of I/O primitives have gained the ability to close their
10850 reading/writing halves to cancel pending operations.
10851 * Reverse iterator methods have been removed in favor of `rev()` on
10852 their forward-iteration counterparts.
10853 * A bitflags! macro has been added to enable easy interop with C and
10854 management of bit flags.
10855 * A debug_assert! macro is now provided which is disabled when
10856 `--cfg ndebug` is passed to the compiler.
10857 * A graphviz crate has been added for creating .dot files.
10858 * The std::cast module has been migrated into std::mem.
10859 * The std::local_data api has been migrated from freestanding functions
10860 to being based on methods.
10861 * The Pod trait has been renamed to Copy.
10862 * jemalloc has been added as the default allocator for types.
10863 * The API for allocating memory has been changed to use proper alignment
10864 and sized deallocation
10865 * Connecting a TcpStream or binding a TcpListener is now based on a
10866 string address and a u16 port. This allows connecting to a hostname as
10868 * The Reader trait now contains a core method, read_at_least(), which
10869 correctly handles many repeated 0-length reads.
10870 * The process-spawning API is now centered around a builder-style
10872 * The :? printing qualifier has been moved from the standard library to
10873 an external libdebug crate.
10874 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10875 have been renamed to Eq/Ord.
10876 * The select/plural methods have been removed from format!. The escapes
10877 for { and } have also changed from \{ and \} to {{ and }},
10879 * The TaskBuilder API has been re-worked to be a true builder, and
10880 extension traits for spawning native/green tasks have been added.
10883 * All breaking changes to the language or libraries now have their
10884 commit message annotated with `[breaking-change]` to allow for easy
10885 discovery of breaking changes.
10886 * The compiler will now try to suggest how to annotate lifetimes if a
10887 lifetime-related error occurs.
10888 * Debug info continues to be improved greatly with general bug fixes and
10889 better support for situations like link time optimization (LTO).
10890 * Usage of syntax extensions when cross-compiling has been fixed.
10891 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10892 -fdata-sections and --gc-sections has been enabled by default
10893 * The compiler is now stricter about where it will load module files
10894 from when a module is declared via `mod foo;`.
10895 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10896 Syntax extensions are now discovered via a "plugin registrar" type
10897 which will be extended in the future to other various plugins.
10898 * Lints have been restructured to allow for dynamically loadable lints.
10899 * A number of rustdoc improvements:
10900 * The HTML output has been visually redesigned.
10901 * Markdown is now powered by hoedown instead of sundown.
10902 * Searching heuristics have been greatly improved.
10903 * The search index has been reduced in size by a great amount.
10904 * Cross-crate documentation via `pub use` has been greatly improved.
10905 * Primitive types are now hyperlinked and documented.
10906 * Documentation has been moved from static.rust-lang.org/doc to
10908 * A new sandbox, play.rust-lang.org, is available for running and
10909 sharing rust code examples on-line.
10910 * Unused attributes are now more robustly warned about.
10911 * The dead_code lint now warns about unused struct fields.
10912 * Cross-compiling to iOS is now supported.
10913 * Cross-compiling to mipsel is now supported.
10914 * Stability attributes are now inherited by default and no longer apply
10915 to intra-crate usage, only inter-crate usage.
10916 * Error message related to non-exhaustive match expressions have been
10920 Version 0.10 (2014-04-03)
10921 =========================
10923 * ~1500 changes, numerous bugfixes
10926 * A new RFC process is now in place for modifying the language.
10927 * Patterns with `@`-pointers have been removed from the language.
10928 * Patterns with unique vectors (`~[T]`) have been removed from the
10930 * Patterns with unique strings (`~str`) have been removed from the
10932 * `@str` has been removed from the language.
10933 * `@[T]` has been removed from the language.
10934 * `@self` has been removed from the language.
10935 * `@Trait` has been removed from the language.
10936 * Headers on `~` allocations which contain `@` boxes inside the type for
10937 reference counting have been removed.
10938 * The semantics around the lifetimes of temporary expressions have changed,
10939 see #3511 and #11585 for more information.
10940 * Cross-crate syntax extensions are now possible, but feature gated. See
10941 #11151 for more information. This includes both `macro_rules!` macros as
10942 well as syntax extensions such as `format!`.
10943 * New lint modes have been added, and older ones have been turned on to be
10945 * Unnecessary parentheses
10946 * Uppercase statics
10948 * Uppercase variables
10949 * Publicly visible private types
10950 * `#[deriving]` with raw pointers
10951 * Unsafe functions can no longer be coerced to closures.
10952 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10953 * The `#[simd]` attribute is now behind a feature gate.
10954 * Visibility is no longer allowed on `extern crate` statements, and
10955 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10956 * Trailing commas are now allowed in argument lists and tuple patterns.
10957 * The `do` keyword has been removed, it is now a reserved keyword.
10958 * Default type parameters have been implemented, but are feature gated.
10959 * Borrowed variables through captures in closures are now considered soundly.
10960 * `extern mod` is now `extern crate`
10961 * The `Freeze` trait has been removed.
10962 * The `Share` trait has been added for types that can be shared among
10964 * Labels in macros are now hygienic.
10965 * Expression/statement macro invocations can be delimited with `{}` now.
10966 * Treatment of types allowed in `static mut` locations has been tweaked.
10967 * The `*` and `.` operators are now overloadable through the `Deref` and
10969 * `~Trait` and `proc` no longer have `Send` bounds by default.
10970 * Partial type hints are now supported with the `_` type marker.
10971 * An `Unsafe` type was introduced for interior mutability. It is now
10972 considered undefined to transmute from `&T` to `&mut T` without using the
10974 * The #[linkage] attribute was implemented for extern statics/functions.
10975 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10976 * `Pod` was renamed to `Copy`.
10979 * The `libextra` library has been removed. It has now been decomposed into
10980 component libraries with smaller and more focused nuggets of
10981 functionality. The full list of libraries can be found on the
10982 documentation index page.
10983 * std: `std::condition` has been removed. All I/O errors are now propagated
10984 through the `Result` type. In order to assist with error handling, a
10985 `try!` macro for unwrapping errors with an early return and a lint for
10986 unused results has been added. See #12039 for more information.
10987 * std: The `vec` module has been renamed to `slice`.
10988 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10989 This will become the only growable vector in the future.
10990 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10991 are now found at `std::io::BufferedReader` instead of
10992 `std::io::buffered::BufferedReader`.
10993 * std: `print` and `println` are no longer in the prelude, the `print!` and
10994 `println!` macros are intended to be used instead.
10995 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10996 attempts to statically prevent cycles.
10997 * std: The standard distribution is adopting the policy of pushing failure
10998 to the user rather than failing in libraries. Many functions (such as
10999 `slice::last()`) now return `Option<T>` instead of `T` + failing.
11000 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
11001 deriving mode: `#[deriving(Show)]`.
11002 * std: `ToStr` is now implemented for all types implementing `Show`.
11003 * std: The formatting trait methods now take `&self` instead of `&T`
11004 * std: The `invert()` method on iterators has been renamed to `rev()`
11005 * std: `std::num` has seen a reduction in the genericity of its traits,
11006 consolidating functionality into a few core traits.
11007 * std: Backtraces are now printed on task failure if the environment
11008 variable `RUST_BACKTRACE` is present.
11009 * std: Naming conventions for iterators have been standardized. More details
11010 can be found on the wiki's style guide.
11011 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11012 still implement the function.
11013 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11014 * std: `assert_approx_eq!` has been removed
11015 * std: The `e` and `E` formatting specifiers for floats have been added to
11016 print them in exponential notation.
11017 * std: The `Times` trait has been removed
11018 * std: Indications of variance and opting out of builtin bounds is done
11019 through marker types in `std::kinds::marker` now
11020 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11021 `#[deriving(Hash)]` is now possible.
11022 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11023 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11024 * std: `Chan::new` is now `channel()`.
11025 * std: A new synchronous channel type has been implemented.
11026 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11027 * std: `hashmap` and `trie` have been moved to `libcollections`
11028 * std: `run` has been rolled into `io::process`
11029 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11030 * std: The equality and comparison traits have seen some reorganization.
11031 * std: `rand` has moved to `librand`.
11032 * std: `to_{lower,upper}case` has been implemented for `char`.
11033 * std: Logging has been moved to `liblog`.
11034 * collections: `HashMap` has been rewritten for higher performance and less
11036 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11037 it can be booted manually. The runtime guide has more information and
11039 * native: All I/O functionality except signals has been implemented.
11040 * green: Task spawning with `libgreen` has been optimized with stack caching
11041 and various trimming of code.
11042 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11043 * sync: The `extra::sync` module has been updated to modern rust (and moved
11044 to the `sync` library), tweaking and improving various interfaces while
11045 dropping redundant functionality.
11046 * sync: A new `Barrier` type has been added to the `sync` library.
11047 * sync: An efficient mutex for native and green tasks has been implemented.
11048 * serialize: The `base64` module has seen some improvement. It treats
11049 newlines better, has non-string error values, and has seen general
11051 * fourcc: A `fourcc!` macro was introduced
11052 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11053 hexadecimal literal.
11056 * `rustpkg` has been deprecated and removed from the main repository. Its
11057 replacement, `cargo`, is under development.
11058 * Nightly builds of rust are now available
11059 * The memory usage of rustc has been improved many times throughout this
11061 * The build process supports disabling rpath support for the rustc binary
11063 * Code generation has improved in some cases, giving more information to the
11064 LLVM optimization passes to enable more extensive optimizations.
11065 * Debuginfo compatibility with lldb on OSX has been restored.
11066 * The master branch is now gated on an android bot, making building for
11067 android much more reliable.
11068 * Output flags have been centralized into one `--emit` flag.
11069 * Crate type flags have been centralized into one `--crate-type` flag.
11070 * Codegen flags have been consolidated behind a `-C` flag.
11071 * Linking against outdated crates now has improved error messages.
11072 * Error messages with lifetimes will often suggest how to annotate the
11073 function to fix the error.
11074 * Many more types are documented in the standard library, and new guides
11076 * Many `rustdoc` improvements:
11077 * code blocks are syntax highlighted.
11078 * render standalone markdown files.
11079 * the --test flag tests all code blocks by default.
11080 * exported macros are displayed.
11081 * re-exported types have their documentation inlined at the location of the
11083 * search works across crates that have been rendered to the same output
11087 Version 0.9 (2014-01-09)
11088 ==========================
11090 * ~1800 changes, numerous bugfixes
11093 * The `float` type has been removed. Use `f32` or `f64` instead.
11094 * A new facility for enabling experimental features (feature gating) has
11095 been added, using the crate-level `#[feature(foo)]` attribute.
11096 * Managed boxes (@) are now behind a feature gate
11097 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11098 standard library's `Gc` or `Rc` types instead.
11099 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11100 * Jumping back to the top of a loop is now done with `continue` instead of
11102 * Strings can no longer be mutated through index assignment.
11103 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11104 hash delimiters, as in `r###"foo"###`.
11105 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11107 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11108 * `@fn`s have been removed.
11109 * `do` only works with procs in order to make it obvious what the cost
11111 * Single-element tuple-like structs can no longer be dereferenced to
11112 obtain the inner value. A more comprehensive solution for overloading
11113 the dereference operator will be provided in the future.
11114 * The `#[link(...)]` attribute has been replaced with
11115 `#[crate_id = "name#vers"]`.
11116 * Empty `impl`s must be terminated with empty braces and may not be
11117 terminated with a semicolon.
11118 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11119 no longer has any special meaning.
11120 * The old `fmt!` string formatting macro has been removed.
11121 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11122 `print!` and `println!`.
11123 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11124 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11125 `extern mod foo = "bar"` instead.
11126 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11127 * Macros can have attributes.
11128 * Macros can expand to items with attributes.
11129 * Macros can expand to multiple items.
11130 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11131 * Comments may be nested.
11132 * Values automatically coerce to trait objects they implement, without
11134 * Enum discriminants are no longer an entire word but as small as needed to
11135 contain all the variants. The `repr` attribute can be used to override
11136 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11137 `#[repr(C)]` to match C enums.
11138 * Non-string literals are not allowed in attributes (they never worked).
11139 * The FFI now supports variadic functions.
11140 * Octal numeric literals, as in `0o7777`.
11141 * The `concat!` syntax extension performs compile-time string concatenation.
11142 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11143 removed as Rust no longer uses segmented stacks.
11144 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11145 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11146 not `*`; ignoring remaining fields of a struct is also done with `..`,
11147 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11148 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11149 * `rustc` supports the "system" calling convention, which defaults to the
11150 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11152 * The `type_overflow` lint (default: warn) checks literals for overflow.
11153 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11154 * The `attribute_usage` lint (default: warn) warns about unknown
11156 * The `unknown_features` lint (default: warn) warns about unknown
11158 * The `dead_code` lint (default: warn) checks for dead code.
11159 * Rust libraries can be linked statically to one another
11160 * `#[link_args]` is behind the `link_args` feature gate.
11161 * Native libraries are now linked with `#[link(name = "foo")]`
11162 * Native libraries can be statically linked to a rust crate
11163 (`#[link(name = "foo", kind = "static")]`).
11164 * Native OS X frameworks are now officially supported
11165 (`#[link(name = "foo", kind = "framework")]`).
11166 * The `#[thread_local]` attribute creates thread-local (not task-local)
11167 variables. Currently behind the `thread_local` feature gate.
11168 * The `return` keyword may be used in closures.
11169 * Types that can be copied via a memcpy implement the `Pod` kind.
11170 * The `cfg` attribute can now be used on struct fields and enum variants.
11173 * std: The `option` and `result` API's have been overhauled to make them
11174 simpler, more consistent, and more composable.
11175 * std: The entire `std::io` module has been replaced with one that is
11176 more comprehensive and that properly interfaces with the underlying
11177 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11179 * std: `io::util` contains a number of useful implementations of
11180 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11181 `ZeroReader`, `TeeReader`.
11182 * std: The reference counted pointer type `extra::rc` moved into std.
11183 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11184 just a wrapper around it).
11185 * std: The `Either` type has been removed.
11186 * std: `fmt::Default` can be implemented for any type to provide default
11187 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11188 * std: The `rand` API continues to be tweaked.
11189 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11190 on failure in gdb, is now named `rust_fail`.
11191 * std: The `each_key` and `each_value` methods on `HashMap` have been
11192 replaced by the `keys` and `values` iterators.
11193 * std: Functions dealing with type size and alignment have moved from the
11194 `sys` module to the `mem` module.
11195 * std: The `path` module was written and API changed.
11196 * std: `str::from_utf8` has been changed to cast instead of allocate.
11197 * std: `starts_with` and `ends_with` methods added to vectors via the
11198 `ImmutableEqVector` trait, which is in the prelude.
11199 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11200 if the index is out of bounds.
11201 * std: Task failure no longer propagates between tasks, as the model was
11202 complex, expensive, and incompatible with thread-based tasks.
11203 * std: The `Any` type can be used for dynamic typing.
11204 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11206 * std: Methods that produce iterators generally do not have an `_iter`
11208 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11209 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11210 * std: `util::ignore` renamed to `prelude::drop`.
11211 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11213 * std: `vec::raw` has seen a lot of cleanup and API changes.
11214 * std: The standard library no longer includes any C++ code, and very
11215 minimal C, eliminating the dependency on libstdc++.
11216 * std: Runtime scheduling and I/O functionality has been factored out into
11217 extensible interfaces and is now implemented by two different crates:
11218 libnative, for native threading and I/O; and libgreen, for green threading
11219 and I/O. This paves the way for using the standard library in more limited
11220 embedded environments.
11221 * std: The `comm` module has been rewritten to be much faster, have a
11222 simpler, more consistent API, and to work for both native and green
11224 * std: All libuv dependencies have been moved into the rustuv crate.
11225 * native: New implementations of runtime scheduling on top of OS threads.
11226 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11228 * green: The green thread scheduler and message passing types are almost
11229 entirely lock-free.
11230 * extra: The `flatpipes` module had bitrotted and was removed.
11231 * extra: All crypto functions have been removed and Rust now has a policy of
11232 not reimplementing crypto in the standard library. In the future crypto
11233 will be provided by external crates with bindings to established libraries.
11234 * extra: `c_vec` has been modernized.
11235 * extra: The `sort` module has been removed. Use the `sort` method on
11239 * The `rust` and `rusti` commands have been removed, due to lack of
11241 * `rustdoc` was completely rewritten.
11242 * `rustdoc` can test code examples in documentation.
11243 * `rustpkg` can test packages with the argument, 'test'.
11244 * `rustpkg` supports arbitrary dependencies, including C libraries.
11245 * `rustc`'s support for generating debug info is improved again.
11246 * `rustc` has better error reporting for unbalanced delimiters.
11247 * `rustc`'s JIT support was removed due to bitrot.
11248 * Executables and static libraries can be built with LTO (-Z lto)
11249 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11253 Version 0.8 (2013-09-26)
11254 ============================
11256 * ~2200 changes, numerous bugfixes
11259 * The `for` loop syntax has changed to work with the `Iterator` trait.
11260 * At long last, unwinding works on Windows.
11261 * Default methods are ready for use.
11262 * Many trait inheritance bugs fixed.
11263 * Owned and borrowed trait objects work more reliably.
11264 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11265 * rustc can omit emission of code for the `debug!` macro if it is passed
11267 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11268 for foo.rs, then foo/mod.rs, and will generate an error when both are
11270 * Strings no longer contain trailing nulls. The new `std::c_str` module
11271 provides new mechanisms for converting to C strings.
11272 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11273 * The FFI has been overhauled such that foreign functions are called directly,
11274 instead of through a stack-switching wrapper.
11275 * Calling a foreign function must be done through a Rust function with the
11276 `#[fixed_stack_segment]` attribute.
11277 * The `externfn!` macro can be used to declare both a foreign function and
11278 a `#[fixed_stack_segment]` wrapper at once.
11279 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11280 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11281 * `priv` is disallowed everywhere except for struct fields and enum variants.
11282 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11283 * `ref` bindings in irrefutable patterns work correctly now.
11284 * `char` is now prevented from containing invalid code points.
11285 * Casting to `bool` is no longer allowed.
11286 * `\0` is now accepted as an escape in chars and strings.
11287 * `yield` is a reserved keyword.
11288 * `typeof` is a reserved keyword.
11289 * Crates may be imported by URL with `extern mod foo = "url";`.
11290 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11291 * Static vectors can be initialized with repeating elements,
11292 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11293 * Static structs can be initialized with functional record update,
11294 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11295 * `cfg!` can be used to conditionally execute code based on the crate
11296 configuration, similarly to `#[cfg(...)]`.
11297 * The `unnecessary_qualification` lint detects unneeded module
11298 prefixes (default: allow).
11299 * Arithmetic operations have been implemented on the SIMD types in
11300 `std::unstable::simd`.
11301 * Exchange allocation headers were removed, reducing memory usage.
11302 * `format!` implements a completely new, extensible, and higher-performance
11303 string formatting system. It will replace `fmt!`.
11304 * `print!` and `println!` write formatted strings (using the `format!`
11305 extension) to stdout.
11306 * `write!` and `writeln!` write formatted strings (using the `format!`
11307 extension) to the new Writers in `std::rt::io`.
11308 * The library section in which a function or static is placed may
11309 be specified with `#[link_section = "..."]`.
11310 * The `proto!` syntax extension for defining bounded message protocols
11312 * `macro_rules!` is hygienic for `let` declarations.
11313 * The `#[export_name]` attribute specifies the name of a symbol.
11314 * `unreachable!` can be used to indicate unreachable code, and fails
11318 * std: Transitioned to the new runtime, written in Rust.
11319 * std: Added an experimental I/O library, `rt::io`, based on the new
11321 * std: A new generic `range` function was added to the prelude, replacing
11322 `uint::range` and friends.
11323 * std: `range_rev` no longer exists. Since range is an iterator it can be
11324 reversed with `range(lo, hi).invert()`.
11325 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11326 renamed to `unwrap_or`.
11327 * std: The `iterator` module was renamed to `iter`.
11328 * std: Integral types now support the `checked_add`, `checked_sub`, and
11329 `checked_mul` operations for detecting overflow.
11330 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11332 * std: Methods are standardizing on conventions for casting methods:
11333 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11335 * std: The `CString` type in `c_str` provides new ways to convert to and
11337 * std: `DoubleEndedIterator` can yield elements in two directions.
11338 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11340 * std: `str::from_bytes` renamed to `str::from_utf8`.
11341 * std: `pop_opt` and `shift_opt` methods added to vectors.
11342 * std: The task-local data interface no longer uses @, and keys are
11343 no longer function pointers.
11344 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11345 * std: Added `SharedPort` to `comm`.
11346 * std: `Eq` has a default method for `ne`; only `eq` is required
11347 in implementations.
11348 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11349 is required in implementations.
11350 * std: `is_utf8` performance is improved, impacting many string functions.
11351 * std: `os::MemoryMap` provides cross-platform mmap.
11352 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11353 are not 'in-bounds' are considered undefined.
11354 * std: Many freestanding functions in `vec` removed in favor of methods.
11355 * std: Many freestanding functions on scalar types removed in favor of
11357 * std: Many options to task builders were removed since they don't make
11358 sense in the new scheduler design.
11359 * std: More containers implement `FromIterator` so can be created by the
11361 * std: More complete atomic types in `unstable::atomics`.
11362 * std: `comm::PortSet` removed.
11363 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11364 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11365 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11366 default implementations.
11367 * std: Various `from_str` functions were removed in favor of a generic
11368 `from_str` which is available in the prelude.
11369 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11370 * extra: `dlist`, the doubly-linked list was modernized.
11371 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11372 * extra: Added `glob` module, replacing `std::os::glob`.
11373 * extra: `rope` was removed.
11374 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11375 * extra: `net`, and `timer` were removed. The experimental replacements
11376 are `std::rt::io::net` and `std::rt::io::timer`.
11377 * extra: Iterators implemented for `SmallIntMap`.
11378 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11379 * extra: `SmallIntSet` removed. Use `BitvSet`.
11380 * extra: Performance of JSON parsing greatly improved.
11381 * extra: `semver` updated to SemVer 2.0.0.
11382 * extra: `term` handles more terminals correctly.
11383 * extra: `dbg` module removed.
11384 * extra: `par` module removed.
11385 * extra: `future` was cleaned up, with some method renames.
11386 * extra: Most free functions in `getopts` were converted to methods.
11389 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11390 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11391 similarly to gcc's `--march` flag.
11392 * rustc's performance compiling small crates is much better.
11393 * rustpkg has received many improvements.
11394 * rustpkg supports git tags as package IDs.
11395 * rustpkg builds into target-specific directories so it can be used for
11397 * The number of concurrent test tasks is controlled by the environment
11398 variable RUST_TEST_TASKS.
11399 * The test harness can now report metrics for benchmarks.
11400 * All tools have man pages.
11401 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11402 * The runtime uses jemalloc for allocations.
11403 * Segmented stacks are temporarily disabled as part of the transition to
11404 the new runtime. Stack overflows are possible!
11405 * A new documentation backend, rustdoc_ng, is available for use. It is
11406 still invoked through the normal `rustdoc` command.
11409 Version 0.7 (2013-07-03)
11410 =======================
11412 * ~2000 changes, numerous bugfixes
11415 * `impl`s no longer accept a visibility qualifier. Put them on methods
11417 * The borrow checker has been rewritten with flow-sensitivity, fixing
11418 many bugs and inconveniences.
11419 * The `self` parameter no longer implicitly means `&'self self`,
11420 and can be explicitly marked with a lifetime.
11421 * Overloadable compound operators (`+=`, etc.) have been temporarily
11422 removed due to bugs.
11423 * The `for` loop protocol now requires `for`-iterators to return `bool`
11424 so they compose better.
11425 * The `Durable` trait is replaced with the `'static` bounds.
11426 * Trait default methods work more often.
11427 * Structs with the `#[packed]` attribute have byte alignment and
11428 no padding between fields.
11429 * Type parameters bound by `Copy` must now be copied explicitly with
11430 the `copy` keyword.
11431 * It is now illegal to move out of a dereferenced unsafe pointer.
11432 * `Option<~T>` is now represented as a nullable pointer.
11433 * `@mut` does dynamic borrow checks correctly.
11434 * The `main` function is only detected at the topmost level of the crate.
11435 The `#[main]` attribute is still valid anywhere.
11436 * Struct fields may no longer be mutable. Use inherited mutability.
11437 * The `#[no_send]` attribute makes a type that would otherwise be
11439 * The `#[no_freeze]` attribute makes a type that would otherwise be
11441 * Unbounded recursion will abort the process after reaching the limit
11442 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11443 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11444 are never implicitly copyable.
11445 * `#[static_assert]` makes compile-time assertions about static bools.
11446 * At long last, 'argument modes' no longer exist.
11447 * The rarely used `use mod` statement no longer exists.
11449 * Syntax extensions
11450 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11452 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11453 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11454 `#[deriving(...)]`.
11455 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11456 and unsuffixed integer literals.
11459 * The `core` crate was renamed to `std`.
11460 * The `std` crate was renamed to `extra`.
11461 * More and improved documentation.
11462 * std: `iterator` module for external iterator objects.
11463 * Many old-style (internal, higher-order function) iterators replaced by
11464 implementations of `Iterator`.
11465 * std: Many old internal vector and string iterators,
11466 incl. `any`, `all`. removed.
11467 * std: The `finalize` method of `Drop` renamed to `drop`.
11468 * std: The `drop` method now takes `&mut self` instead of `&self`.
11469 * std: The prelude no longer re-exports any modules, only types and traits.
11470 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11471 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11472 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11473 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11474 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11475 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11476 * std: Many types implement `Clone`.
11477 * std: `path` type renamed to `Path`.
11478 * std: `mut` module and `Mut` type removed.
11479 * std: Many standalone functions removed in favor of methods and iterators
11480 in `vec`, `str`. In the future methods will also work as functions.
11481 * std: `reinterpret_cast` removed. Use `transmute`.
11482 * std: ascii string handling in `std::ascii`.
11483 * std: `Rand` is implemented for ~/@.
11484 * std: `run` module for spawning processes overhauled.
11485 * std: Various atomic types added to `unstable::atomic`.
11486 * std: Various types implement `Zero`.
11487 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11488 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11489 * std: Added `os::mkdir_recursive`.
11490 * std: Added `os::glob` function performs filesystems globs.
11491 * std: `FuzzyEq` renamed to `ApproxEq`.
11492 * std: `Map` now defines `pop` and `swap` methods.
11493 * std: `Cell` constructors converted to static methods.
11494 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11495 * extra: `flate` module moved from `std` to `extra`.
11496 * extra: `fileinput` module for iterating over a series of files.
11497 * extra: `Complex` number type and `complex` module.
11498 * extra: `Rational` number type and `rational` module.
11499 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11500 * extra: `term` uses terminfo now, is more correct.
11501 * extra: `arc` functions converted to methods.
11502 * extra: Implementation of fixed output size variations of SHA-2.
11505 * `unused_variables` lint mode for unused variables (default: warn).
11506 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11508 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11510 * `dead_assignment` lint mode for unread variables (default: warn).
11511 * `unnecessary_allocation` lint mode detects some heap allocations that are
11512 immediately borrowed so could be written without allocating (default: warn).
11513 * `missing_doc` lint mode (default: allow).
11514 * `unreachable_code` lint mode (default: warn).
11515 * The `rusti` command has been rewritten and a number of bugs addressed.
11516 * rustc outputs in color on more terminals.
11517 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11518 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11519 * Compiling with `-g` will make the binary record information about
11520 dynamic borrowcheck failures for debugging.
11521 * rustdoc has a nicer stylesheet.
11522 * Various improvements to rustdoc.
11523 * Improvements to rustpkg (see the detailed release notes).
11526 Version 0.6 (2013-04-03)
11527 ========================
11529 * ~2100 changes, numerous bugfixes
11532 * The self type parameter in traits is now spelled `Self`
11533 * The `self` parameter in trait and impl methods must now be explicitly
11534 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11535 * Static methods no longer require the `static` keyword and instead
11536 are distinguished by the lack of a `self` parameter
11537 * Replaced the `Durable` trait with the `'static` lifetime
11538 * The old closure type syntax with the trailing sigil has been
11539 removed in favor of the more consistent leading sigil
11540 * `super` is a keyword, and may be prefixed to paths
11541 * Trait bounds are separated with `+` instead of whitespace
11542 * Traits are implemented with `impl Trait for Type`
11543 instead of `impl Type: Trait`
11544 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11545 * The `export` keyword has finally been removed
11546 * The `move` keyword has been removed (see "Semantic changes")
11547 * The interior mutability qualifier on vectors, `[mut T]`, has been
11548 removed. Use `&mut [T]`, etc.
11549 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11550 * `fail` is no longer a keyword. Use `fail!()`
11551 * `assert` is no longer a keyword. Use `assert!()`
11552 * `log` is no longer a keyword. use `debug!`, etc.
11553 * 1-tuples may be represented as `(T,)`
11554 * Struct fields may no longer be `mut`. Use inherited mutability,
11555 `@mut T`, `core::mut` or `core::cell`
11556 * `extern mod { ... }` is no longer valid syntax for foreign
11557 function modules. Use extern blocks: `extern { ... }`
11558 * Newtype enums removed. Use tuple-structs.
11559 * Trait implementations no longer support visibility modifiers
11560 * Pattern matching over vectors improved and expanded
11561 * `const` renamed to `static` to correspond to lifetime name,
11562 and make room for future `static mut` unsafe mutable globals.
11563 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11564 * `Clone` implementations can be automatically generated with
11565 `#[deriving(Clone)]`
11566 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11567 instead of `foo as Bar`.
11568 * Fixed length vector types are now written as `[int, .. 3]`
11569 instead of `[int * 3]`.
11570 * Fixed length vector types can express the length as a constant
11571 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11574 * Types with owned pointers or custom destructors move by default,
11575 eliminating the `move` keyword
11576 * All foreign functions are considered unsafe
11577 * &mut is now unaliasable
11578 * Writes to borrowed @mut pointers are prevented dynamically
11580 * The name of the main function can be customized using #[main]
11581 * The default type of an inferred closure is &fn instead of @fn
11582 * `use` statements may no longer be "chained" - they cannot import
11583 identifiers imported by previous `use` statements
11584 * `use` statements are crate relative, importing from the "top"
11585 of the crate by default. Paths may be prefixed with `super::`
11586 or `self::` to change the search behavior.
11587 * Method visibility is inherited from the implementation declaration
11588 * Structural records have been removed
11589 * Many more types can be used in static items, including enums
11590 'static-lifetime pointers and vectors
11591 * Pattern matching over vectors improved and expanded
11592 * Typechecking of closure types has been overhauled to
11593 improve inference and eliminate unsoundness
11594 * Macros leave scope at the end of modules, unless that module is
11595 tagged with #[macro_escape]
11598 * Added big integers to `std::bigint`
11599 * Removed `core::oldcomm` module
11600 * Added pipe-based `core::comm` module
11601 * Numeric traits have been reorganized under `core::num`
11602 * `vec::slice` finally returns a slice
11603 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11604 * Containers reorganized around traits in `core::container`
11605 * `core::dvec` removed, `~[T]` is a drop-in replacement
11606 * `core::send_map` renamed to `core::hashmap`
11607 * `std::map` removed; replaced with `core::hashmap`
11608 * `std::treemap` reimplemented as an owned balanced tree
11609 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11610 * `core::trie` added as a fast ordered map for integer keys
11611 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11612 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11613 overload the comparison operators, whereas `TotalOrd` is used
11614 by certain container types
11617 * Replaced the 'cargo' package manager with 'rustpkg'
11618 * Added all-purpose 'rust' tool
11619 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11620 * rustc now *attempts* to offer spelling suggestions
11621 * Improved support for ARM and Android
11622 * Preliminary MIPS backend
11623 * Improved foreign function ABI implementation for x86, x86_64
11624 * Various memory usage improvements
11625 * Rust code may be embedded in foreign code under limited circumstances
11626 * Inline assembler supported by new asm!() syntax extension.
11629 Version 0.5 (2012-12-21)
11630 ===========================
11632 * ~900 changes, numerous bugfixes
11635 * Removed `<-` move operator
11636 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11637 * Removed old fixed length vector syntax - `[T]/N`
11638 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11639 * Macros may now expand to items and statements
11640 * `a.b()` is always parsed as a method call, never as a field projection
11641 * `Eq` and `IterBytes` implementations can be automatically generated
11642 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11643 * Removed the special crate language for `.rc` files
11644 * Function arguments may consist of any irrefutable pattern
11647 * `&` and `~` pointers may point to objects
11648 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11649 * Enum variants may be structs
11650 * Destructors can be added to all nominal types with the Drop trait
11651 * Structs and nullary enum variants may be constants
11652 * Values that cannot be implicitly copied are now automatically moved
11653 without writing `move` explicitly
11654 * `&T` may now be coerced to `*T`
11655 * Coercions happen in `let` statements as well as function calls
11656 * `use` statements now take crate-relative paths
11657 * The module and type namespaces have been merged so that static
11658 method names can be resolved under the trait in which they are
11661 * Improved support for language features
11662 * Trait inheritance works in many scenarios
11663 * More support for explicit self arguments in methods - `self`, `&self`
11664 `@self`, and `~self` all generally work as expected
11665 * Static methods work in more situations
11666 * Experimental: Traits may declare default methods for the implementations
11670 * New condition handling system in `core::condition`
11671 * Timsort added to `std::sort`
11672 * New priority queue, `std::priority_queue`
11673 * Pipes for serializable types, `std::flatpipes'
11674 * Serialization overhauled to be trait-based
11675 * Expanded `getopts` definitions
11676 * Moved futures to `std`
11677 * More functions are pure now
11678 * `core::comm` renamed to `oldcomm`. Still deprecated
11679 * `rustdoc` and `cargo` are libraries now
11682 * Added a preliminary REPL, `rusti`
11683 * License changed from MIT to dual MIT/APL2
11686 Version 0.4 (2012-10-15)
11687 ==========================
11689 * ~2000 changes, numerous bugfixes
11692 * All keywords are now strict and may not be used as identifiers anywhere
11693 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11694 'of', 'with', 'to', 'class'.
11695 * Classes are replaced with simpler structs
11696 * Explicit method self types
11697 * `ret` became `return` and `alt` became `match`
11698 * `import` is now `use`; `use is now `extern mod`
11699 * `extern mod { ... }` is now `extern { ... }`
11700 * `use mod` is the recommended way to import modules
11701 * `pub` and `priv` replace deprecated export lists
11702 * The syntax of `match` pattern arms now uses fat arrow (=>)
11703 * `main` no longer accepts an args vector; use `os::args` instead
11706 * Trait implementations are now coherent, ala Haskell typeclasses
11707 * Trait methods may be static
11708 * Argument modes are deprecated
11709 * Borrowed pointers are much more mature and recommended for use
11710 * Strings and vectors in the static region are stored in constant memory
11711 * Typestate was removed
11712 * Resolution rewritten to be more reliable
11713 * Support for 'dual-mode' data structures (freezing and thawing)
11716 * Most binary operators can now be overloaded via the traits in
11718 * `std::net::url` for representing URLs
11719 * Sendable hash maps in `core::send_map`
11720 * `core::task' gained a (currently unsafe) task-local storage API
11723 * An efficient new intertask communication primitive called the pipe,
11724 along with a number of higher-level channel types, in `core::pipes`
11725 * `std::arc`, an atomically reference counted, immutable, shared memory
11727 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11728 * Futures are now based on pipes and sendable
11729 * More robust linked task failure
11730 * Improved task builder API
11733 * Improved error reporting
11734 * Preliminary JIT support
11735 * Preliminary work on precise GC
11736 * Extensive architectural improvements to rustc
11737 * Begun a transition away from buggy C++-based reflection (shape) code to
11738 Rust-based (visitor) code
11739 * All hash functions and tables converted to secure, randomized SipHash
11742 Version 0.3 (2012-07-12)
11743 ========================
11745 * ~1900 changes, numerous bugfixes
11747 * New coding conveniences
11748 * Integer-literal suffix inference
11749 * Per-item control over warnings, errors
11750 * #[cfg(windows)] and #[cfg(unix)] attributes
11751 * Documentation comments
11752 * More compact closure syntax
11753 * 'do' expressions for treating higher-order functions as
11755 * *-patterns (wildcard extended to all constructor fields)
11758 * Name resolution pass and exhaustiveness checker rewritten
11759 * Region pointers and borrow checking supersede alias
11761 * Init-ness checking is now provided by a region-based liveness
11762 pass instead of the typestate pass; same for last-use analysis
11763 * Extensive work on region pointers
11765 * Experimental new language features
11766 * Slices and fixed-size, interior-allocated vectors
11767 * #!-comments for lang versioning, shell execution
11768 * Destructors and iface implementation for classes;
11769 type-parameterized classes and class methods
11770 * 'const' type kind for types that can be used to implement
11771 shared-memory concurrency patterns
11775 * Removal of various obsolete features
11776 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11777 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11779 * Constructs: do-while loops ('do' repurposed), fn binding,
11780 resources (replaced by destructors)
11782 * Compiler reorganization
11783 * Syntax-layer of compiler split into separate crate
11784 * Clang (from LLVM project) integrated into build
11785 * Typechecker split into sub-modules
11788 * New time functions
11789 * Extension methods for many built-in types
11790 * Arc: atomic-refcount read-only / exclusive-use shared cells
11791 * Par: parallel map and search routines
11792 * Extensive work on libuv interface
11793 * Much vector code moved to libraries
11794 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11795 #include, #include_str, #include_bin
11797 * Tool improvements
11798 * Cargo automatically resolves dependencies
11801 Version 0.2 (2012-03-29)
11802 =========================
11804 * >1500 changes, numerous bugfixes
11806 * New docs and doc tooling
11808 * New port: FreeBSD x86_64
11810 * Compilation model enhancements
11811 * Generics now specialized, multiply instantiated
11812 * Functions now inlined across separate crates
11814 * Scheduling, stack and threading fixes
11815 * Noticeably improved message-passing performance
11816 * Explicit schedulers
11820 * Experimental new language features
11821 * Operator overloading
11825 * Various language extensions
11826 * C-callback function types: 'crust fn ...'
11827 * Infinite-loop construct: 'loop { ... }'
11828 * Shorten 'mutable' to 'mut'
11829 * Required mutable-local qualifier: 'let mut ...'
11830 * Basic glob-exporting: 'export foo::*;'
11831 * Alt now exhaustive, 'alt check' for runtime-checked
11832 * Block-function form of 'for' loop, with 'break' and 'ret'.
11835 * AST quasi-quote syntax extension
11836 * Revived libuv interface
11837 * New modules: core::{future, iter}, std::arena
11838 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11839 * Extensive cleanup, regularization in libstd, libcore
11842 Version 0.1 (2012-01-20)
11843 ===============================
11845 * Most language features work, including:
11846 * Unique pointers, unique closures, move semantics
11847 * Interface-constrained generics
11848 * Static interface dispatch
11850 * Multithread task scheduling
11851 * Typestate predicates
11852 * Failure unwinding, destructors
11853 * Pattern matching and destructuring assignment
11854 * Lightweight block-lambda syntax
11855 * Preliminary macro-by-example
11857 * Compiler works with the following configurations:
11858 * Linux: x86 and x86_64 hosts and targets
11859 * macOS: x86 and x86_64 hosts and targets
11860 * Windows: x86 hosts and targets
11862 * Cross compilation / multi-target configuration supported.
11864 * Preliminary API-documentation and package-management tools included.
11868 * Documentation is incomplete.
11870 * Performance is below intended target.
11872 * Standard library APIs are subject to extensive change, reorganization.
11874 * Language-level versioning is not yet operational - future code will
11875 break unexpectedly.