1 Version 1.64.0 (2022-09-22)
2 ===========================
6 - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
7 - It is now considered valid to deallocate memory pointed to by a shared reference `&T` [if every byte in `T` is inside an `UnsafeCell`](https://github.com/rust-lang/rust/pull/98017/)
8 - Unused tuple struct fields are now warned against in an allow-by-default lint, [`unused_tuple_struct_fields`](https://github.com/rust-lang/rust/pull/95977/), similar to the existing warning for unused struct fields. This lint will become warn-by-default in the future.
12 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
13 - Refer to Rust's [platform support page][platform-support-doc] for more
14 information on Rust's tiered platform support.
15 - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
16 - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
17 - [Fix repr(align) enum handling](https://github.com/rust-lang/rust/pull/96814/)
18 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
22 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
23 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
24 - [Enforce that layout size fits in isize in Layout](https://github.com/rust-lang/rust/pull/95295/)
25 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
26 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
27 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
28 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
29 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
30 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
35 - [`ffi::CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html)
36 - [`ffi::CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html)
37 - [`ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesWithNulError.html)
38 - [`ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromVecWithNulError.html)
39 - [`ffi::IntoStringError`](https://doc.rust-lang.org/stable/std/ffi/struct.IntoStringError.html)
40 - [`ffi::NulError`](https://doc.rust-lang.org/stable/std/ffi/struct.NulError.html)
41 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
42 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
43 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
44 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
45 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
46 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
47 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
48 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
49 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
50 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
51 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
52 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
53 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
54 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
55 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
56 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
57 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
58 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
59 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
60 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
61 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
62 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
63 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
64 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
65 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
66 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
67 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
68 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
69 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
70 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
71 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
72 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
74 These APIs are now usable in const contexts:
76 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
80 - [Packages can now inherit settings from the workspace so that the settings
81 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
82 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
84 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
85 for more details on how to define these common settings.
86 - [Cargo commands can now accept multiple `--target` flags to build for
87 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
88 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
89 config option may now take an array of multiple targets.
90 - [The `--jobs` argument can now take a negative number to count backwards from
91 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
92 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
93 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
94 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
95 flag to `cargo rustc` to override the crate type.
96 - [Significantly improved the performance fetching git dependencies from GitHub
97 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
101 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
105 - 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/)
106 - [Network primitives are now implemented with the ideal Rust layout, not the C system layout](https://github.com/rust-lang/rust/pull/78802/). This can cause problems when transmuting the types.
107 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
108 - [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.
109 - [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.
110 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
111 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
112 - 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/).
113 - [`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.
118 These changes do not affect any public interfaces of Rust, but they represent
119 significant improvements to the performance or internals of rustc and related
122 - 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/)
123 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
124 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
125 - Many improvements to generated code for derives, including performance improvements:
126 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
127 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
128 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
129 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
130 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
131 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
132 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
133 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
134 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
135 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
136 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
138 Version 1.63.0 (2022-08-11)
139 ==========================
143 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
144 - [Modify MIR building to drop repeat expressions with length zero.][95953]
145 - [Remove label/lifetime shadowing warnings.][96296]
146 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
147 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
148 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
149 - [lub: don't bail out due to empty binders.][97867]
153 - [Stabilize the `bundle` native library modifier,][95818] also removing the
154 deprecated `static-nobundle` linking kind.
155 - [Add Apple WatchOS compile targets\*.][95243]
156 - [Add a Windows application manifest to rustc-main.][96737]
158 \* Refer to Rust's [platform support page][platform-support-doc] for more
159 information on Rust's tiered platform support.
163 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
164 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
165 - [`impl Read and Write for VecDeque<u8>`.][95632]
166 - [STD support for the Nintendo 3DS.][95897]
167 - [Use rounding in float to Duration conversion methods.][96051]
168 - [Make write/print macros eagerly drop temporaries.][96455]
169 - [Implement internal traits that enable `[OsStr]::join`.][96881]
170 - [Implement `Hash` for `core::alloc::Layout`.][97034]
171 - [Add capacity documentation for `OsString`.][97202]
172 - [Put a bound on collection misbehavior.][97316]
173 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
174 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
175 - [Document Rust's stance on `/proc/self/mem`.][97837]
182 - [`BinaryHeap::try_reserve`]
183 - [`BinaryHeap::try_reserve_exact`]
184 - [`OsString::try_reserve`]
185 - [`OsString::try_reserve_exact`]
186 - [`PathBuf::try_reserve`]
187 - [`PathBuf::try_reserve_exact`]
188 - [`Path::try_exists`]
189 - [`Ref::filter_map`]
190 - [`RefMut::filter_map`]
191 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
192 - [`ToOwned::clone_into`]
193 - [`Ipv6Addr::to_ipv4_mapped`]
195 - [`unix::io::BorrowedFd<'fd>`]
196 - [`unix::io::OwnedFd`]
197 - [`windows::io::AsHandle`]
198 - [`windows::io::BorrowedHandle<'handle>`]
199 - [`windows::io::OwnedHandle`]
200 - [`windows::io::HandleOrInvalid`]
201 - [`windows::io::HandleOrNull`]
202 - [`windows::io::InvalidHandleError`]
203 - [`windows::io::NullHandleError`]
204 - [`windows::io::AsSocket`]
205 - [`windows::io::BorrowedSocket<'handle>`]
206 - [`windows::io::OwnedSocket`]
209 - [`thread::ScopedJoinHandle`]
211 These APIs are now usable in const contexts:
213 - [`array::from_ref`]
214 - [`slice::from_ref`]
215 - [`intrinsics::copy`]
216 - [`intrinsics::copy_nonoverlapping`]
217 - [`<*const T>::copy_to`]
218 - [`<*const T>::copy_to_nonoverlapping`]
219 - [`<*mut T>::copy_to`]
220 - [`<*mut T>::copy_to_nonoverlapping`]
221 - [`<*mut T>::copy_from`]
222 - [`<*mut T>::copy_from_nonoverlapping`]
224 - [`Utf8Error::error_len`]
225 - [`Utf8Error::valid_up_to`]
232 - [Stabilize the `--config path` command-line argument.][cargo/10755]
233 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
238 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
239 errors for invalid attribute arguments that were previously ignored.
240 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
241 duration can differ slightly from what it was.
246 These changes provide no direct user facing benefits, but represent significant
247 improvements to the internals and overall performance of rustc
250 - [Prepare Rust for LLVM opaque pointers.][94214]
252 [94214]: https://github.com/rust-lang/rust/pull/94214/
253 [94530]: https://github.com/rust-lang/rust/pull/94530/
254 [94954]: https://github.com/rust-lang/rust/pull/94954/
255 [95243]: https://github.com/rust-lang/rust/pull/95243/
256 [95565]: https://github.com/rust-lang/rust/pull/95565/
257 [95632]: https://github.com/rust-lang/rust/pull/95632/
258 [95818]: https://github.com/rust-lang/rust/pull/95818/
259 [95897]: https://github.com/rust-lang/rust/pull/95897/
260 [95953]: https://github.com/rust-lang/rust/pull/95953/
261 [96051]: https://github.com/rust-lang/rust/pull/96051/
262 [96296]: https://github.com/rust-lang/rust/pull/96296/
263 [96455]: https://github.com/rust-lang/rust/pull/96455/
264 [96737]: https://github.com/rust-lang/rust/pull/96737/
265 [96868]: https://github.com/rust-lang/rust/pull/96868/
266 [96881]: https://github.com/rust-lang/rust/pull/96881/
267 [96885]: https://github.com/rust-lang/rust/pull/96885/
268 [96959]: https://github.com/rust-lang/rust/pull/96959/
269 [97034]: https://github.com/rust-lang/rust/pull/97034/
270 [97202]: https://github.com/rust-lang/rust/pull/97202/
271 [97316]: https://github.com/rust-lang/rust/pull/97316/
272 [97652]: https://github.com/rust-lang/rust/pull/97652/
273 [97675]: https://github.com/rust-lang/rust/pull/97675/
274 [97803]: https://github.com/rust-lang/rust/pull/97803/
275 [97837]: https://github.com/rust-lang/rust/pull/97837/
276 [97867]: https://github.com/rust-lang/rust/pull/97867/
277 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
278 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
280 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
281 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
282 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
283 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
284 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
285 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
286 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
287 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
288 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
289 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
290 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
291 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
292 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
293 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
294 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
295 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
296 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
297 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
298 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
299 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
300 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
301 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
302 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
303 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
304 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
305 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
306 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
307 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
308 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
309 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
311 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
312 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
313 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
314 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
315 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
316 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
317 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
318 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
319 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
320 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
321 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
322 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
323 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
324 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
325 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
326 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
328 Version 1.62.1 (2022-07-19)
329 ==========================
331 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
332 library, and also mitigates a CPU vulnerability on Intel SGX.
334 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
335 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
336 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
337 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
338 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
340 [98608]: https://github.com/rust-lang/rust/issues/98608
341 [98890]: https://github.com/rust-lang/rust/issues/98890
342 [98950]: https://github.com/rust-lang/rust/pull/98950
343 [98126]: https://github.com/rust-lang/rust/pull/98126
344 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
346 Version 1.62.0 (2022-06-30)
347 ==========================
352 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
353 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
354 - [Fix constants not getting dropped if part of a diverging expression][94775]
355 - [Support unit struct/enum variant in destructuring assignment][95380]
356 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
357 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
362 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
363 - [Make `unaligned_references` lint deny-by-default][95372]
364 This lint is also a future compatibility lint, and is expected to eventually
366 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
367 - [Reject `#[thread_local]` attribute on non-static items][95006]
368 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
369 - [Implement a lint to warn about unused macro rules][96150]
370 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
372 \* Refer to Rust's [platform support page][platform-support-doc] for more
373 information on Rust's tiered platform support.
378 - [Windows: Use a pipe relay for chaining pipes][95841]
379 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
380 - [Replace RwLock by a futex based one on Linux][95801]
381 - [std: directly use pthread in UNIX parker implementation][96393]
386 - [`bool::then_some`]
390 - [`windows::CommandExt::raw_arg`]
391 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
392 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
393 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
394 - [`FusedIterator for EncodeWide`]
395 - [RDM intrinsics on aarch64][stdarch/1285]
400 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
405 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
407 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
408 - Package ID specs now support `name@version` syntax in addition to the
409 previous `name:version` to align with the behavior in `cargo add` and other
410 tools. `cargo install` and `cargo yank` also now support this syntax so the
411 version does not need to passed as a separate flag.
412 - The `git` and `registry` directories in Cargo's home directory (usually
413 `~/.cargo`) are now marked as cache directories so that they are not
414 included in backups or content indexing (on Windows).
415 - Added automatic `@` argfile support, which will use "response files" if the
416 command-line to `rustc` exceeds the operating system's limit.
421 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
422 the same as the host target.
423 [#10594](https://github.com/rust-lang/cargo/pull/10594)
424 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
425 - [rustdoc: Remove .woff font files][96279]
426 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
427 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
428 complete synchronously][95469].
433 - [Unify ReentrantMutex implementations across all platforms][96042]
435 These changes provide no direct user facing benefits, but represent significant
436 improvements to the internals and overall performance of rustc
439 [93313]: https://github.com/rust-lang/rust/pull/93313/
440 [93969]: https://github.com/rust-lang/rust/pull/93969/
441 [94206]: https://github.com/rust-lang/rust/pull/94206/
442 [94457]: https://github.com/rust-lang/rust/pull/94457/
443 [94775]: https://github.com/rust-lang/rust/pull/94775/
444 [94872]: https://github.com/rust-lang/rust/pull/94872/
445 [95006]: https://github.com/rust-lang/rust/pull/95006/
446 [95035]: https://github.com/rust-lang/rust/pull/95035/
447 [95346]: https://github.com/rust-lang/rust/pull/95346/
448 [95372]: https://github.com/rust-lang/rust/pull/95372/
449 [95380]: https://github.com/rust-lang/rust/pull/95380/
450 [95431]: https://github.com/rust-lang/rust/pull/95431/
451 [95469]: https://github.com/rust-lang/rust/pull/95469/
452 [95705]: https://github.com/rust-lang/rust/pull/95705/
453 [95801]: https://github.com/rust-lang/rust/pull/95801/
454 [95819]: https://github.com/rust-lang/rust/pull/95819/
455 [95841]: https://github.com/rust-lang/rust/pull/95841/
456 [96042]: https://github.com/rust-lang/rust/pull/96042/
457 [96150]: https://github.com/rust-lang/rust/pull/96150/
458 [96268]: https://github.com/rust-lang/rust/pull/96268/
459 [96279]: https://github.com/rust-lang/rust/pull/96279/
460 [96393]: https://github.com/rust-lang/rust/pull/96393/
461 [96436]: https://github.com/rust-lang/rust/pull/96436/
462 [96557]: https://github.com/rust-lang/rust/pull/96557/
463 [96630]: https://github.com/rust-lang/rust/pull/96630/
465 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
466 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
467 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
468 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
469 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
470 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
471 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
472 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
473 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
474 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
476 Version 1.61.0 (2022-05-19)
477 ==========================
482 - [`const fn` signatures can now include generic trait bounds][93827]
483 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
484 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
485 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
490 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
491 - [The `char` type is now described as UTF-32 in debuginfo][89887]
492 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
493 - X86 [`#[target_feature = "adx"]` is now stable][93745]
498 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
499 - [`#[ignore = "…"]` messages are printed when running tests][92714]
500 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
501 - [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.
502 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
503 - [`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.
508 - [`Pin::static_mut`]
509 - [`Pin::static_ref`]
510 - [`Vec::retain_mut`]
511 - [`VecDeque::retain_mut`]
512 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
513 - [`std::os::unix::net::SocketAddr::from_pathname`]
514 - [`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.
515 - [`std::thread::JoinHandle::is_finished`]
517 These APIs are now usable in const contexts:
519 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
520 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
521 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
522 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
523 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
524 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
525 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
526 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
527 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
532 No feature changes, but see compatibility notes.
537 - 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
538 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
539 - (less common) or be updated to use the [`+whole-archive`] modifier.
540 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
541 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
542 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
543 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
544 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
545 - [`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`.
546 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
551 These changes provide no direct user facing benefits, but represent significant
552 improvements to the internals and overall performance of rustc
555 - [debuginfo: Refactor debuginfo generation for types][94261]
556 - [Remove the everybody loops pass][93913]
558 [88375]: https://github.com/rust-lang/rust/pull/88375/
559 [89887]: https://github.com/rust-lang/rust/pull/89887/
560 [90621]: https://github.com/rust-lang/rust/pull/90621/
561 [92285]: https://github.com/rust-lang/rust/pull/92285/
562 [92472]: https://github.com/rust-lang/rust/pull/92472/
563 [92697]: https://github.com/rust-lang/rust/pull/92697/
564 [92714]: https://github.com/rust-lang/rust/pull/92714/
565 [92911]: https://github.com/rust-lang/rust/pull/92911/
566 [93263]: https://github.com/rust-lang/rust/pull/93263/
567 [93745]: https://github.com/rust-lang/rust/pull/93745/
568 [93827]: https://github.com/rust-lang/rust/pull/93827/
569 [93901]: https://github.com/rust-lang/rust/pull/93901/
570 [93913]: https://github.com/rust-lang/rust/pull/93913/
571 [93965]: https://github.com/rust-lang/rust/pull/93965/
572 [94081]: https://github.com/rust-lang/rust/pull/94081/
573 [94261]: https://github.com/rust-lang/rust/pull/94261/
574 [94295]: https://github.com/rust-lang/rust/pull/94295/
575 [94832]: https://github.com/rust-lang/rust/pull/94832/
576 [95016]: https://github.com/rust-lang/rust/pull/95016/
577 [95251]: https://github.com/rust-lang/rust/pull/95251/
578 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
579 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
580 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
581 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
582 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
583 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
584 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
585 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
586 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
587 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
588 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
589 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
590 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
591 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
592 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
593 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
594 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
595 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
596 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
597 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
598 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
599 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
602 Version 1.60.0 (2022-04-07)
603 ==========================
607 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
608 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
612 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
613 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
614 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
615 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
616 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
617 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
618 - [Fix invalid removal of newlines from doc comments][92357]
619 - [Add kernel target for RustyHermit][92670]
620 - [Deny mixing bin crate type with lib crate types][92933]
621 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
622 - [Upgrade to LLVM 14][93577]
624 \* Refer to Rust's [platform support page][platform-support-doc] for more
625 information on Rust's tiered platform support.
629 - [Guarantee call order for `sort_by_cached_key`][89621]
630 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
631 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
632 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
633 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
637 - [`Arc::new_cyclic`][arc_new_cyclic]
638 - [`Rc::new_cyclic`][rc_new_cyclic]
639 - [`slice::EscapeAscii`][slice_escape_ascii]
640 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
641 - [`u8::escape_ascii`][u8_escape_ascii]
642 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
643 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
644 - [`MaybeUninit::assume_init_read`][assume_init_read]
645 - [`i8::abs_diff`][i8_abs_diff]
646 - [`i16::abs_diff`][i16_abs_diff]
647 - [`i32::abs_diff`][i32_abs_diff]
648 - [`i64::abs_diff`][i64_abs_diff]
649 - [`i128::abs_diff`][i128_abs_diff]
650 - [`isize::abs_diff`][isize_abs_diff]
651 - [`u8::abs_diff`][u8_abs_diff]
652 - [`u16::abs_diff`][u16_abs_diff]
653 - [`u32::abs_diff`][u32_abs_diff]
654 - [`u64::abs_diff`][u64_abs_diff]
655 - [`u128::abs_diff`][u128_abs_diff]
656 - [`usize::abs_diff`][usize_abs_diff]
657 - [`Display for io::ErrorKind`][display_error_kind]
658 - [`From<u8> for ExitCode`][from_u8_exit_code]
659 - [`Not for !` (the "never" type)][not_never]
660 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
661 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
665 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
666 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
667 - [Stabilize namespaced and weak dependency features.][cargo/10269]
668 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
669 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
673 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
674 - [Drop rustc-docs from complete profile][93742]
675 - [bootstrap: tidy up flag handling for llvm build][93918]
679 - [Remove compiler-rt linking hack on Android][83822]
680 - [Mitigations for platforms with non-monotonic clocks have been removed from
681 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
682 instant is not guaranteed to be greater than an earlier instant anymore.
683 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
684 saturating to `0` instead][89926]. In the real world the panic happened mostly
685 on platforms with buggy monotonic clock implementations rather than catching
686 programming errors like reversing the start and end times. Such programming
687 errors will now results in `0` rather than a panic.
688 - In a future release we're planning to increase the baseline requirements for
689 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
690 your feedback in [PR #95026][95026].
695 These changes provide no direct user facing benefits, but represent significant
696 improvements to the internals and overall performance of rustc
699 - [Switch all libraries to the 2021 edition][92068]
701 [83822]: https://github.com/rust-lang/rust/pull/83822
702 [86374]: https://github.com/rust-lang/rust/pull/86374
703 [87487]: https://github.com/rust-lang/rust/pull/87487
704 [89621]: https://github.com/rust-lang/rust/pull/89621
705 [89926]: https://github.com/rust-lang/rust/pull/89926
706 [90132]: https://github.com/rust-lang/rust/pull/90132
707 [90247]: https://github.com/rust-lang/rust/pull/90247
708 [91606]: https://github.com/rust-lang/rust/pull/91606
709 [92068]: https://github.com/rust-lang/rust/pull/92068
710 [92300]: https://github.com/rust-lang/rust/pull/92300
711 [92357]: https://github.com/rust-lang/rust/pull/92357
712 [92383]: https://github.com/rust-lang/rust/pull/92383
713 [92630]: https://github.com/rust-lang/rust/pull/92630
714 [92670]: https://github.com/rust-lang/rust/pull/92670
715 [92800]: https://github.com/rust-lang/rust/pull/92800
716 [92933]: https://github.com/rust-lang/rust/pull/92933
717 [93566]: https://github.com/rust-lang/rust/pull/93566
718 [93577]: https://github.com/rust-lang/rust/pull/93577
719 [93658]: https://github.com/rust-lang/rust/pull/93658
720 [93742]: https://github.com/rust-lang/rust/pull/93742
721 [93824]: https://github.com/rust-lang/rust/pull/93824
722 [93918]: https://github.com/rust-lang/rust/pull/93918
723 [95026]: https://github.com/rust-lang/rust/pull/95026
725 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
726 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
727 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
728 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
729 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
731 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
732 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
733 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
734 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
735 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
736 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
737 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
738 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
739 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
740 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
741 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
742 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
743 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
744 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
745 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
746 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
747 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
748 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
749 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
750 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
751 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
752 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
753 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
754 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
755 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
757 Version 1.59.0 (2022-02-24)
758 ==========================
763 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
764 - [Stabilize destructuring assignment][90521]
765 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
766 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
771 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
772 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
773 - [Fix sparc64 ABI for aggregates with floating point members][91003]
774 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
775 - [Add support for riscv64gc-unknown-freebsd][91284]
776 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
777 - [Soft disable incremental compilation][94124]
779 This release disables incremental compilation, unless the user has explicitly
780 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
781 This is due to a known and relatively frequently occurring bug in incremental
782 compilation, which causes builds to issue internal compiler errors. This
783 particular bug is already fixed on nightly, but that fix has not yet rolled out
784 to stable and is deemed too risky for a direct stable backport.
786 As always, we encourage users to test with nightly and report bugs so that we
787 can track failures and fix issues earlier.
789 See [94124] for more details.
791 [94124]: https://github.com/rust-lang/rust/issues/94124
796 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
801 - [`std::thread::available_parallelism`][available_parallelism]
802 - [`Result::copied`][result-copied]
803 - [`Result::cloned`][result-cloned]
804 - [`arch::asm!`][asm]
805 - [`arch::global_asm!`][global_asm]
806 - [`ops::ControlFlow::is_break`][is_break]
807 - [`ops::ControlFlow::is_continue`][is_continue]
808 - [`TryFrom<char> for u8`][try_from_char_u8]
809 - [`char::TryFromCharError`][try_from_char_err]
810 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
812 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
813 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
814 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
815 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
816 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
817 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
818 - [`DoubleEndedIterator for ToLowercase`][lowercase]
819 - [`DoubleEndedIterator for ToUppercase`][uppercase]
820 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
821 - [`UnwindSafe for Once`][unwindsafe_once]
822 - [`RefUnwindSafe for Once`][refunwindsafe_once]
823 - [armv8 neon intrinsics for aarch64][stdarch/1266]
827 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
828 - [`mem::MaybeUninit::assume_init`][muninit_init]
829 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
830 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
835 - [Stabilize the `strip` profile option][cargo/10088]
836 - [Stabilize future-incompat-report][cargo/10165]
837 - [Support abbreviating `--release` as `-r`][cargo/10133]
838 - [Support `term.quiet` configuration][cargo/10152]
839 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
844 - [Refactor weak symbols in std::sys::unix][90846]
845 This may add new, versioned, symbols when building with a newer glibc, as the
846 standard library uses weak linkage rather than dynamically attempting to load
847 certain symbols at runtime.
848 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
849 This adds a future compatibility lint to supporting the use of cfg_attr
850 wrapping either crate_type or crate_name specification within Rust files;
851 it is recommended that users migrate to setting the equivalent command line
853 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
854 This may expose new names, leading to conflicts with preexisting names in a
855 given namespace and a compilation failure.
856 - [Cargo will document libraries before binaries.][cargo/10172]
857 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
858 - [Weaken guarantee around advancing underlying iterators in zip][83791]
859 - [Make split_inclusive() on an empty slice yield an empty output][89825]
860 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
861 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
866 These changes provide no direct user facing benefits, but represent significant
867 improvements to the internals and overall performance of rustc
870 - [Fix many cases of normalization-related ICEs][91255]
871 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
872 - [Store liveness in interval sets for region inference][90637]
874 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
875 unstable feature.][91867]
877 [91867]: https://github.com/rust-lang/rust/issues/91867
878 [83744]: https://github.com/rust-lang/rust/pull/83744/
879 [83791]: https://github.com/rust-lang/rust/pull/83791/
880 [85013]: https://github.com/rust-lang/rust/pull/85013/
881 [89825]: https://github.com/rust-lang/rust/pull/89825/
882 [89999]: https://github.com/rust-lang/rust/pull/89999/
883 [90128]: https://github.com/rust-lang/rust/pull/90128/
884 [90207]: https://github.com/rust-lang/rust/pull/90207/
885 [90521]: https://github.com/rust-lang/rust/pull/90521/
886 [90586]: https://github.com/rust-lang/rust/pull/90586/
887 [90637]: https://github.com/rust-lang/rust/pull/90637/
888 [90833]: https://github.com/rust-lang/rust/pull/90833/
889 [90846]: https://github.com/rust-lang/rust/pull/90846/
890 [91003]: https://github.com/rust-lang/rust/pull/91003/
891 [91172]: https://github.com/rust-lang/rust/pull/91172/
892 [91255]: https://github.com/rust-lang/rust/pull/91255/
893 [91284]: https://github.com/rust-lang/rust/pull/91284/
894 [91535]: https://github.com/rust-lang/rust/pull/91535/
895 [91593]: https://github.com/rust-lang/rust/pull/91593/
896 [91728]: https://github.com/rust-lang/rust/pull/91728/
897 [91878]: https://github.com/rust-lang/rust/pull/91878/
898 [91896]: https://github.com/rust-lang/rust/pull/91896/
899 [91926]: https://github.com/rust-lang/rust/pull/91926/
900 [91984]: https://github.com/rust-lang/rust/pull/91984/
901 [92020]: https://github.com/rust-lang/rust/pull/92020/
902 [92034]: https://github.com/rust-lang/rust/pull/92034/
903 [92137]: https://github.com/rust-lang/rust/pull/92137/
904 [92483]: https://github.com/rust-lang/rust/pull/92483/
905 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
906 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
907 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
908 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
909 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
910 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
911 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
912 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
914 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
915 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
916 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
917 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
918 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
919 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
920 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
921 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
922 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
923 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
924 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
925 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
926 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
927 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
928 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
929 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
930 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
931 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
932 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
933 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
934 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
935 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
936 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
937 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
938 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
939 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
941 Version 1.58.1 (2022-01-19)
942 ===========================
944 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
945 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
946 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
947 * [Fix wrong error message displayed when some imports are missing][91254]
948 * [Fix rustfmt not formatting generated files from stdin][92912]
950 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
951 [91254]: https://github.com/rust-lang/rust/pull/91254
952 [92912]: https://github.com/rust-lang/rust/pull/92912
953 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
954 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
956 Version 1.58.0 (2022-01-13)
957 ==========================
962 - [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.
963 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
964 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
969 - [Add LLVM CFI support to the Rust compiler][89652]
970 - [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.
971 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
972 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
973 - [Update the minimum external LLVM to 12][90175]
974 - [Add `x86_64-unknown-none` at Tier 3*][89062]
975 - [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.
976 - [Don't abort compilation after giving a lint error][87337]
977 - [Error messages point at the source of trait bound obligations in more places][89580]
979 \* Refer to Rust's [platform support page][platform-support-doc] for more
980 information on Rust's tiered platform support.
985 - [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.
986 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
987 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
988 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
989 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
990 - [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).
995 - [`Metadata::is_symlink`]
996 - [`Path::is_symlink`]
997 - [`{integer}::saturating_div`]
998 - [`Option::unwrap_unchecked`]
999 - [`Result::unwrap_unchecked`]
1000 - [`Result::unwrap_err_unchecked`]
1003 These APIs are now usable in const contexts:
1006 - [`Duration::checked_add`]
1007 - [`Duration::saturating_add`]
1008 - [`Duration::checked_sub`]
1009 - [`Duration::saturating_sub`]
1010 - [`Duration::checked_mul`]
1011 - [`Duration::saturating_mul`]
1012 - [`Duration::checked_div`]
1017 - [Add --message-format for install command][cargo/10107]
1018 - [Warn when alias shadows external subcommand][cargo/10082]
1023 - [Show all Deref implementations recursively in rustdoc][90183]
1024 - [Use computed visibility in rustdoc][88447]
1029 - [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.
1030 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1031 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1032 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1033 - [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.
1034 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1039 These changes provide no direct user facing benefits, but represent significant
1040 improvements to the internals and overall performance of rustc
1043 - [Implement coherence checks for negative trait impls][90104]
1044 - [Add rustc lint, warning when iterating over hashmaps][89558]
1045 - [Optimize live point computation][90491]
1046 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1047 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1049 [87337]: https://github.com/rust-lang/rust/pull/87337/
1050 [87467]: https://github.com/rust-lang/rust/pull/87467/
1051 [87704]: https://github.com/rust-lang/rust/pull/87704/
1052 [88041]: https://github.com/rust-lang/rust/pull/88041/
1053 [88447]: https://github.com/rust-lang/rust/pull/88447/
1054 [88601]: https://github.com/rust-lang/rust/pull/88601/
1055 [89062]: https://github.com/rust-lang/rust/pull/89062/
1056 [89174]: https://github.com/rust-lang/rust/pull/89174/
1057 [89551]: https://github.com/rust-lang/rust/pull/89551/
1058 [89558]: https://github.com/rust-lang/rust/pull/89558/
1059 [89580]: https://github.com/rust-lang/rust/pull/89580/
1060 [89652]: https://github.com/rust-lang/rust/pull/89652/
1061 [90041]: https://github.com/rust-lang/rust/pull/90041/
1062 [90058]: https://github.com/rust-lang/rust/pull/90058/
1063 [90104]: https://github.com/rust-lang/rust/pull/90104/
1064 [90117]: https://github.com/rust-lang/rust/pull/90117/
1065 [90175]: https://github.com/rust-lang/rust/pull/90175/
1066 [90183]: https://github.com/rust-lang/rust/pull/90183/
1067 [90297]: https://github.com/rust-lang/rust/pull/90297/
1068 [90329]: https://github.com/rust-lang/rust/pull/90329/
1069 [90361]: https://github.com/rust-lang/rust/pull/90361/
1070 [90417]: https://github.com/rust-lang/rust/pull/90417/
1071 [90473]: https://github.com/rust-lang/rust/pull/90473/
1072 [90491]: https://github.com/rust-lang/rust/pull/90491/
1073 [90733]: https://github.com/rust-lang/rust/pull/90733/
1074 [90833]: https://github.com/rust-lang/rust/pull/90833/
1075 [90846]: https://github.com/rust-lang/rust/pull/90846/
1076 [91026]: https://github.com/rust-lang/rust/pull/91026/
1077 [91207]: https://github.com/rust-lang/rust/pull/91207/
1078 [91255]: https://github.com/rust-lang/rust/pull/91255/
1079 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1080 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1081 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1082 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1083 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1084 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1085 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1086 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1087 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1088 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1090 Version 1.57.0 (2021-12-02)
1091 ==========================
1096 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1097 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1098 - [Allow panicking in constant evaluation.][89508]
1099 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1104 - [Create more accurate debuginfo for vtables.][89597]
1105 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1106 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1107 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1108 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1110 \* Refer to Rust's [platform support page][platform-support-doc] for more
1111 information on Rust's tiered platform support.
1116 - [Avoid allocations and copying in `Vec::leak`][89337]
1117 - [Add `#[repr(i8)]` to `Ordering`][89507]
1118 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1119 - [Update to Unicode 14.0][89614]
1120 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1121 when ignoring their return value. This helps catch mistakes such as expecting
1122 a function to mutate a value in place rather than return a new value.
1127 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1128 - [`[T; N]::as_slice`][`array::as_slice`]
1129 - [`collections::TryReserveError`]
1130 - [`HashMap::try_reserve`]
1131 - [`HashSet::try_reserve`]
1132 - [`String::try_reserve`]
1133 - [`String::try_reserve_exact`]
1134 - [`Vec::try_reserve`]
1135 - [`Vec::try_reserve_exact`]
1136 - [`VecDeque::try_reserve`]
1137 - [`VecDeque::try_reserve_exact`]
1138 - [`Iterator::map_while`]
1139 - [`iter::MapWhile`]
1140 - [`proc_macro::is_available`]
1141 - [`Command::get_program`]
1142 - [`Command::get_args`]
1143 - [`Command::get_envs`]
1144 - [`Command::get_current_dir`]
1148 These APIs are now usable in const contexts:
1150 - [`hint::unreachable_unchecked`]
1155 - [Stabilize custom profiles][cargo/9943]
1160 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1161 This will break some builds that set `#![deny(dead_code)]`.
1165 These changes provide no direct user facing benefits, but represent significant
1166 improvements to the internals and overall performance of rustc
1169 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1171 [85200]: https://github.com/rust-lang/rust/pull/85200/
1172 [86191]: https://github.com/rust-lang/rust/pull/86191/
1173 [87220]: https://github.com/rust-lang/rust/pull/87220/
1174 [87260]: https://github.com/rust-lang/rust/pull/87260/
1175 [88321]: https://github.com/rust-lang/rust/pull/88321/
1176 [88529]: https://github.com/rust-lang/rust/pull/88529/
1177 [88690]: https://github.com/rust-lang/rust/pull/88690/
1178 [88952]: https://github.com/rust-lang/rust/pull/88952/
1179 [89337]: https://github.com/rust-lang/rust/pull/89337/
1180 [89507]: https://github.com/rust-lang/rust/pull/89507/
1181 [89508]: https://github.com/rust-lang/rust/pull/89508/
1182 [89582]: https://github.com/rust-lang/rust/pull/89582/
1183 [89597]: https://github.com/rust-lang/rust/pull/89597/
1184 [89614]: https://github.com/rust-lang/rust/pull/89614/
1185 [89692]: https://github.com/rust-lang/rust/issues/89692/
1186 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1187 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1188 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1189 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1190 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1191 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1192 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1193 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1194 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1195 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1196 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1197 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1198 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1199 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1200 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1201 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1202 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1203 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1204 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1205 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1206 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1208 Version 1.56.1 (2021-11-01)
1209 ===========================
1211 - New lints to detect the presence of bidirectional-override Unicode
1212 codepoints in the compiled source code ([CVE-2021-42574])
1214 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1216 Version 1.56.0 (2021-10-21)
1217 ========================
1222 - [The 2021 Edition is now stable.][rust#88100]
1223 See [the edition guide][rust-2021-edition-guide] for more details.
1224 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1225 - [Union field access is permitted in `const fn`.][rust#85769]
1227 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1232 - [Upgrade to LLVM 13.][rust#87570]
1233 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1234 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1235 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1236 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1237 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1238 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1239 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1241 \* Refer to Rust's [platform support page][platform-support-doc] for more
1242 information on Rust's tiered platform support.
1247 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1248 The Windows console still requires valid Unicode, but this change allows
1249 splitting a UTF-8 character across multiple write calls. This allows, for
1250 instance, programs that just read and write data buffers (e.g. copying a file
1251 to stdout) without regard for Unicode or character boundaries.
1252 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1253 For this use case, atomics scale much better under contention.
1254 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1255 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1256 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1257 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1258 - [Treat invalid environment variable names as non-existent.][rust#86183]
1259 Previously, the environment functions would panic if given a variable name
1260 with an internal null character or equal sign (`=`). Now, these functions will
1261 just treat such names as non-existent variables, since the OS cannot represent
1262 the existence of a variable with such a name.
1267 - [`std::os::unix::fs::chroot`]
1268 - [`UnsafeCell::raw_get`]
1269 - [`BufWriter::into_parts`]
1270 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1271 These APIs were previously stable in `std`, but are now also available in `core`.
1272 - [`Vec::shrink_to`]
1273 - [`String::shrink_to`]
1274 - [`OsString::shrink_to`]
1275 - [`PathBuf::shrink_to`]
1276 - [`BinaryHeap::shrink_to`]
1277 - [`VecDeque::shrink_to`]
1278 - [`HashMap::shrink_to`]
1279 - [`HashSet::shrink_to`]
1281 These APIs are now usable in const contexts:
1283 - [`std::mem::transmute`]
1284 - [`[T]::first`][`slice::first`]
1285 - [`[T]::split_first`][`slice::split_first`]
1286 - [`[T]::last`][`slice::last`]
1287 - [`[T]::split_last`][`slice::split_last`]
1292 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1293 This has no effect at present on dependency version selection.
1294 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1295 that support Rust code to include a crate's specified minimum version in the test matrix for that
1301 - [Update to new argument parsing rules on Windows.][rust#87580]
1302 This adjusts Rust's standard library to match the behavior of the standard
1303 libraries for C/C++. The rules have changed slightly over time, and this PR
1304 brings us to the latest set of rules (changed in 2008).
1305 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1306 This was already not supported by LLVM; this change surfaces this lack of
1307 support with a better error message.
1308 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1309 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1310 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1311 may return different values on glibc <= 2.24.][rust#81825]
1312 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1313 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1314 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1315 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1319 These changes provide no direct user facing benefits, but represent significant
1320 improvements to the internals and overall performance of rustc
1323 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1324 This improves the performance of most Rust builds.
1325 - [Unify representation of macros in internal data structures.][rust#88019]
1326 This change fixes a host of bugs with the handling of macros by the compiler,
1329 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1330 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1331 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1332 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1333 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1334 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1335 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1336 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1337 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1338 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1339 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1340 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1341 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1342 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1343 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1344 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1345 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1346 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1347 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1348 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1349 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1350 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1351 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1352 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1353 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1354 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1355 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1356 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1357 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1358 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1359 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1360 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1361 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1362 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1363 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1364 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1365 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1366 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1367 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1368 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1369 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1370 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1372 Version 1.55.0 (2021-09-09)
1373 ============================
1377 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1378 will end at the maximum value of the integer.][83918]
1379 - [You can now explicitly import the prelude of different editions
1380 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1384 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1386 \* Refer to Rust's [platform support page][platform-support-doc] for more
1387 information on Rust's tiered platform support.
1392 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1393 These improvements should in general provide faster string parsing of floats,
1394 no longer reject certain valid floating point values, and reduce
1395 the produced code size for non-stripped artifacts.
1396 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1403 - [`IntoInnerError::into_error`]
1404 - [`IntoInnerError::into_parts`]
1405 - [`MaybeUninit::assume_init_mut`]
1406 - [`MaybeUninit::assume_init_ref`]
1407 - [`MaybeUninit::write`]
1409 - [`ops::ControlFlow`]
1411 - [`x86::_bittestandcomplement`]
1412 - [`x86::_bittestandreset`]
1413 - [`x86::_bittestandset`]
1414 - [`x86_64::_bittest64`]
1415 - [`x86_64::_bittestandcomplement64`]
1416 - [`x86_64::_bittestandreset64`]
1417 - [`x86_64::_bittestandset64`]
1419 The following previously stable functions are now `const`.
1421 - [`str::from_utf8_unchecked`]
1426 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1427 rustc in parallel such as when using `cargo test`.][cargo/9675]
1428 - [The package definition in `cargo metadata` now includes the `"default_run"`
1429 field from the manifest.][cargo/9550]
1430 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1431 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1432 of packages.][cargo/9663]
1436 - [Added "Go to item on exact match" search option.][85876]
1437 - [The "Implementors" section on traits no longer shows redundant
1438 method definitions.][85970]
1439 - [Trait implementations are toggled open by default.][86260] This should make the
1440 implementations more searchable by tools like `CTRL+F` in your browser.
1441 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1442 through type aliases.][86334]
1443 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1444 "Trait Implementations" section.][86513]
1449 - [std functions that return an `io::Error` will no longer use the
1450 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1451 kinds of errors could be categorised [into newer more specific `ErrorKind`
1452 variants][79965], and that they do not represent a user error.
1453 - [Using environment variable names with `process::Command` on Windows now
1454 behaves as expected.][85270] Previously using envionment variables with
1455 `Command` would cause them to be ASCII-uppercased.
1456 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1457 with `rustdoc::`][86849]
1458 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1459 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1460 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1463 [86849]: https://github.com/rust-lang/rust/pull/86849
1464 [86513]: https://github.com/rust-lang/rust/pull/86513
1465 [86334]: https://github.com/rust-lang/rust/pull/86334
1466 [86260]: https://github.com/rust-lang/rust/pull/86260
1467 [85970]: https://github.com/rust-lang/rust/pull/85970
1468 [85876]: https://github.com/rust-lang/rust/pull/85876
1469 [83572]: https://github.com/rust-lang/rust/pull/83572
1470 [86294]: https://github.com/rust-lang/rust/pull/86294
1471 [86858]: https://github.com/rust-lang/rust/pull/86858
1472 [86761]: https://github.com/rust-lang/rust/pull/86761
1473 [85746]: https://github.com/rust-lang/rust/pull/85746
1474 [85270]: https://github.com/rust-lang/rust/pull/85270
1475 [83918]: https://github.com/rust-lang/rust/pull/83918
1476 [79965]: https://github.com/rust-lang/rust/pull/79965
1477 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1478 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1479 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1480 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1481 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1482 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1483 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1484 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1485 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1486 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1487 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1488 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1489 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1490 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1491 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1492 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1493 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1494 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1495 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1496 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1497 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1498 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1501 Version 1.54.0 (2021-07-29)
1502 ============================
1505 -----------------------
1507 - [You can now use macros for values in some built-in attributes.][83366]
1508 This primarily allows you to call macros within the `#[doc]` attribute. For
1509 example, to include external documentation in your crate, you can now write
1512 #![doc = include_str!("README.md")]
1515 - [You can now cast between unsized slice types (and types which contain
1516 unsized slices) in `const fn`.][85078]
1517 - [You can now use multiple generic lifetimes with `impl Trait` where the
1518 lifetimes don't explicitly outlive another.][84701] In code this means
1519 that you can now have `impl Trait<'a, 'b>` where as before you could
1520 only have `impl Trait<'a, 'b> where 'b: 'a`.
1523 -----------------------
1525 - [Rustc will now search for custom JSON targets in
1526 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1527 directory.][83800] You can find your sysroot directory by running
1528 `rustc --print sysroot`.
1529 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1530 - [You can now use `#[target_feature]` on safe functions when targeting
1531 WebAssembly platforms.][84988]
1532 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1533 - [Added tier 3\* support for `bpfel-unknown-none`
1534 and `bpfeb-unknown-none`.][79608]
1535 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1537 \* Refer to Rust's [platform support page][platform-support-doc] for more
1538 information on Rust's tiered platform support.
1541 -----------------------
1543 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1544 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1545 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1546 - [The implementations of vendor intrinsics in core::arch have been
1547 significantly refactored.][83278] The main user-visible changes are
1548 a 50% reduction in the size of libcore.rlib and stricter validation
1549 of constant operands passed to intrinsics. The latter is technically
1550 a breaking change, but allows Rust to more closely match the C vendor
1556 - [`BTreeMap::into_keys`]
1557 - [`BTreeMap::into_values`]
1558 - [`HashMap::into_keys`]
1559 - [`HashMap::into_values`]
1561 - [`VecDeque::binary_search`]
1562 - [`VecDeque::binary_search_by`]
1563 - [`VecDeque::binary_search_by_key`]
1564 - [`VecDeque::partition_point`]
1569 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1570 the dependency graph.][cargo/9520]
1571 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1572 in the tree ][cargo/9499]
1573 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1574 macro dependencies.][cargo/9488]
1575 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1576 This variable points to a directory that integration tests and benches
1577 can use as a "scratchpad" for testing filesystem operations.
1581 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1582 - [Previously unsound code is no longer permitted where different constructors in branches
1583 could require different lifetimes.][85574]
1584 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1585 than before and may reject some previously accepted code.
1586 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1587 when compiled with `codegen-units = 1`.][86063]
1589 [85574]: https://github.com/rust-lang/rust/issues/85574
1590 [86831]: https://github.com/rust-lang/rust/issues/86831
1591 [86063]: https://github.com/rust-lang/rust/issues/86063
1592 [79608]: https://github.com/rust-lang/rust/pull/79608
1593 [84988]: https://github.com/rust-lang/rust/pull/84988
1594 [84701]: https://github.com/rust-lang/rust/pull/84701
1595 [84072]: https://github.com/rust-lang/rust/pull/84072
1596 [85745]: https://github.com/rust-lang/rust/pull/85745
1597 [84744]: https://github.com/rust-lang/rust/pull/84744
1598 [85078]: https://github.com/rust-lang/rust/pull/85078
1599 [84717]: https://github.com/rust-lang/rust/pull/84717
1600 [83800]: https://github.com/rust-lang/rust/pull/83800
1601 [83366]: https://github.com/rust-lang/rust/pull/83366
1602 [83278]: https://github.com/rust-lang/rust/pull/83278
1603 [85292]: https://github.com/rust-lang/rust/pull/85292
1604 [82834]: https://github.com/rust-lang/rust/pull/82834
1605 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1606 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1607 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1608 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1609 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1610 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1611 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1612 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1613 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1614 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1615 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1617 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1619 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1621 Version 1.53.0 (2021-06-17)
1622 ============================
1625 -----------------------
1626 - [You can now use unicode for identifiers.][83799] This allows multilingual
1627 identifiers but still doesn't allow glyphs that are not considered characters
1628 such as `◆` or `🦀`. More specifically you can now use any identifier that
1629 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1630 is the same standard as languages like Python, however Rust uses NFC
1631 normalization which may be different from other languages.
1632 - [You can now specify "or patterns" inside pattern matches.][79278]
1633 Previously you could only use `|` (OR) on complete patterns. E.g.
1637 matches!(x, Some(1) | Some(2));
1639 matches!(x, Some(1 | 2));
1641 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1642 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1643 to change semantics to being a pattern fragment in a future edition.
1646 -----------------------
1647 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1648 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1649 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1651 \* Refer to Rust's [platform support page][platform-support-doc] for more
1652 information on Rust's tiered platform support.
1655 -----------------------
1656 - [Abort messages will now forward to `android_set_abort_message` on
1657 Android platforms when available.][81469]
1658 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1659 - [Arrays of any length now implement `IntoIterator`.][84147]
1660 Currently calling `.into_iter()` as a method on an array will
1661 return `impl Iterator<Item=&T>`, but this may change in a
1662 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1663 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1664 - [`leading_zeros`, and `trailing_zeros` are now available on all
1665 `NonZero` integer types.][84082]
1666 - [`{f32, f64}::from_str` now parse and print special values
1667 (`NaN`, `-0`) according to IEEE 754.][78618]
1668 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1669 - [Add the `BITS` associated constant to all numeric types.][82565]
1673 - [`AtomicBool::fetch_update`]
1674 - [`AtomicPtr::fetch_update`]
1675 - [`BTreeMap::retain`]
1676 - [`BTreeSet::retain`]
1677 - [`BufReader::seek_relative`]
1678 - [`DebugStruct::non_exhaustive`]
1680 - [`Duration::ZERO`]
1681 - [`Duration::is_zero`]
1682 - [`Duration::saturating_add`]
1683 - [`Duration::saturating_mul`]
1684 - [`Duration::saturating_sub`]
1685 - [`ErrorKind::Unsupported`]
1686 - [`Option::insert`]
1687 - [`Ordering::is_eq`]
1688 - [`Ordering::is_ge`]
1689 - [`Ordering::is_gt`]
1690 - [`Ordering::is_le`]
1691 - [`Ordering::is_lt`]
1692 - [`Ordering::is_ne`]
1693 - [`OsStr::is_ascii`]
1694 - [`OsStr::make_ascii_lowercase`]
1695 - [`OsStr::make_ascii_uppercase`]
1696 - [`OsStr::to_ascii_lowercase`]
1697 - [`OsStr::to_ascii_uppercase`]
1698 - [`Peekable::peek_mut`]
1699 - [`Rc::decrement_strong_count`]
1700 - [`Rc::increment_strong_count`]
1701 - [`Vec::extend_from_within`]
1702 - [`array::from_mut`]
1703 - [`array::from_ref`]
1704 - [`cmp::max_by_key`]
1706 - [`cmp::min_by_key`]
1708 - [`f32::is_subnormal`]
1709 - [`f64::is_subnormal`]
1712 -----------------------
1713 - [Cargo now supports git repositories where the default `HEAD` branch is not
1714 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1715 which can handle default branches correctly.
1716 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1717 - [The `authors` field is no longer included in `Cargo.toml` for new
1718 projects.][cargo/9282]
1721 -----------------------
1722 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1723 without hyperlinks.][81764]
1727 - [Implement token-based handling of attributes during expansion][82608]
1728 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1729 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1730 to confusion and potential security vulnerabilities and [is no
1731 longer recommended][ietf6943].
1732 - [The added `BITS` constant may conflict with external definitions.][85667]
1733 In particular, this was known to be a problem in the `lexical-core` crate,
1734 but they have published fixes for semantic versions 0.4 through 0.7. To
1735 update this dependency alone, use `cargo update -p lexical-core`.
1736 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1740 These changes provide no direct user facing benefits, but represent significant
1741 improvements to the internals and overall performance of rustc and
1744 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1745 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1746 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1747 - [Rework rustdoc const type][82873]
1749 [85667]: https://github.com/rust-lang/rust/pull/85667
1750 [83386]: https://github.com/rust-lang/rust/pull/83386
1751 [82771]: https://github.com/rust-lang/rust/pull/82771
1752 [84147]: https://github.com/rust-lang/rust/pull/84147
1753 [84082]: https://github.com/rust-lang/rust/pull/84082
1754 [83799]: https://github.com/rust-lang/rust/pull/83799
1755 [83681]: https://github.com/rust-lang/rust/pull/83681
1756 [83652]: https://github.com/rust-lang/rust/pull/83652
1757 [83387]: https://github.com/rust-lang/rust/pull/83387
1758 [82873]: https://github.com/rust-lang/rust/pull/82873
1759 [82864]: https://github.com/rust-lang/rust/pull/82864
1760 [82608]: https://github.com/rust-lang/rust/pull/82608
1761 [82565]: https://github.com/rust-lang/rust/pull/82565
1762 [80525]: https://github.com/rust-lang/rust/pull/80525
1763 [79278]: https://github.com/rust-lang/rust/pull/79278
1764 [78618]: https://github.com/rust-lang/rust/pull/78618
1765 [77704]: https://github.com/rust-lang/rust/pull/77704
1766 [83941]: https://github.com/rust-lang/rust/pull/83941
1767 [83065]: https://github.com/rust-lang/rust/pull/83065
1768 [81764]: https://github.com/rust-lang/rust/pull/81764
1769 [81469]: https://github.com/rust-lang/rust/pull/81469
1770 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1771 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1772 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1773 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1774 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1775 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1776 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1777 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1778 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1779 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1780 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1781 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1782 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1783 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1784 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1785 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1786 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1787 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1788 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1789 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1790 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1791 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1792 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1793 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1794 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1795 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1796 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1797 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1798 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1799 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1800 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1801 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1802 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1803 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1804 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1805 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1806 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1807 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1808 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1809 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1810 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1813 Version 1.52.1 (2021-05-10)
1814 ============================
1816 This release disables incremental compilation, unless the user has explicitly
1817 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1819 This is due to the widespread, and frequently occurring, breakage encountered by
1820 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1821 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1822 newly added incremental verification are still present in past stable versions,
1823 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1826 These problems only affect incremental builds, so release builds with Cargo
1827 should not be affected unless the user has explicitly opted into incremental.
1828 Debug and check builds are affected.
1830 See [84970] for more details.
1832 [84970]: https://github.com/rust-lang/rust/issues/84970
1834 Version 1.52.0 (2021-05-06)
1835 ============================
1839 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1840 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1841 is allowed by default, and may become a warning or hard error in a
1843 - [You can now cast mutable references to arrays to a pointer of the same type as
1844 the element.][81479]
1848 - [Upgraded the default LLVM to LLVM 12.][81451]
1850 Added tier 3\* support for the following targets.
1852 - [`s390x-unknown-linux-musl`][82166]
1853 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1854 - [`powerpc-unknown-openbsd`][82733]
1856 \* Refer to Rust's [platform support page][platform-support-doc] for more
1857 information on Rust's tiered platform support.
1861 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1862 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1863 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1864 - [All integer division and remainder operations are now `const`.][80962]
1868 - [`Arguments::as_str`]
1870 - [`char::REPLACEMENT_CHARACTER`]
1871 - [`char::UNICODE_VERSION`]
1872 - [`char::decode_utf16`]
1873 - [`char::from_digit`]
1874 - [`char::from_u32_unchecked`]
1875 - [`char::from_u32`]
1876 - [`slice::partition_point`]
1877 - [`str::rsplit_once`]
1878 - [`str::split_once`]
1880 The following previously stable APIs are now `const`.
1882 - [`char::len_utf8`]
1883 - [`char::len_utf16`]
1884 - [`char::to_ascii_uppercase`]
1885 - [`char::to_ascii_lowercase`]
1886 - [`char::eq_ignore_ascii_case`]
1887 - [`u8::to_ascii_uppercase`]
1888 - [`u8::to_ascii_lowercase`]
1889 - [`u8::eq_ignore_ascii_case`]
1893 - [Rustdoc lints are now treated as a tool lint, meaning that
1894 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1895 Using the old style is still allowed, and will become a warning in
1897 - [Rustdoc now supports argument files.][82261]
1898 - [Rustdoc now generates smart punctuation for documentation.][79423]
1899 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1907 - [You can now pass multiple filters to tests.][81356] E.g.
1908 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1909 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1910 allowing you to see `std` symbols when debugging.][82218]
1914 These changes provide no direct user facing benefits, but represent significant
1915 improvements to the internals and overall performance of rustc and
1918 - [Check the result cache before the DepGraph when ensuring queries][81855]
1919 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1920 - [Only store a LocalDefId in some HIR nodes][81611]
1921 - [Store HIR attributes in a side table][79519]
1925 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1926 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1927 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1928 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1929 languages in code blocks.][78429]
1930 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1931 - [Changes in how proc macros handle whitespace may lead to panics when used
1932 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1933 - [Turn `#[derive]` into a regular macro attribute][79078]
1935 [84136]: https://github.com/rust-lang/rust/issues/84136
1936 [80763]: https://github.com/rust-lang/rust/pull/80763
1937 [82166]: https://github.com/rust-lang/rust/pull/82166
1938 [82121]: https://github.com/rust-lang/rust/pull/82121
1939 [81879]: https://github.com/rust-lang/rust/pull/81879
1940 [82261]: https://github.com/rust-lang/rust/pull/82261
1941 [82218]: https://github.com/rust-lang/rust/pull/82218
1942 [82216]: https://github.com/rust-lang/rust/pull/82216
1943 [82202]: https://github.com/rust-lang/rust/pull/82202
1944 [81855]: https://github.com/rust-lang/rust/pull/81855
1945 [81766]: https://github.com/rust-lang/rust/pull/81766
1946 [81744]: https://github.com/rust-lang/rust/pull/81744
1947 [81611]: https://github.com/rust-lang/rust/pull/81611
1948 [81479]: https://github.com/rust-lang/rust/pull/81479
1949 [81451]: https://github.com/rust-lang/rust/pull/81451
1950 [81356]: https://github.com/rust-lang/rust/pull/81356
1951 [80962]: https://github.com/rust-lang/rust/pull/80962
1952 [80553]: https://github.com/rust-lang/rust/pull/80553
1953 [80527]: https://github.com/rust-lang/rust/pull/80527
1954 [79519]: https://github.com/rust-lang/rust/pull/79519
1955 [79423]: https://github.com/rust-lang/rust/pull/79423
1956 [79208]: https://github.com/rust-lang/rust/pull/79208
1957 [78429]: https://github.com/rust-lang/rust/pull/78429
1958 [82733]: https://github.com/rust-lang/rust/pull/82733
1959 [82594]: https://github.com/rust-lang/rust/pull/82594
1960 [79078]: https://github.com/rust-lang/rust/pull/79078
1961 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1962 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1963 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1964 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1965 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1966 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1967 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1968 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1969 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1970 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1971 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1972 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1973 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1974 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1975 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1976 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1977 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1978 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1979 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1980 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1981 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1982 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1984 Version 1.51.0 (2021-03-25)
1985 ============================
1989 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1990 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1991 E.g. you can now write the following. Note: Only values of primitive integers,
1992 `bool`, or `char` types are currently permitted.
1994 struct GenericArray<T, const LENGTH: usize> {
1998 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1999 const fn last(&self) -> Option<&T> {
2003 Some(&self.inner[LENGTH - 1])
2013 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2014 This option controls whether debug information is split across multiple files
2015 or packed into a single file. **Note** This option is unstable on other platforms.
2016 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2017 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2018 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2019 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2021 \* Refer to Rust's [platform support page][platform-support-doc] for more
2022 information on Rust's tiered platform support.
2027 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2028 - [`str` now implements `AsMut<str>`.][80279]
2029 - [`u64` and `u128` now implement `From<char>`.][79502]
2030 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2031 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2032 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2033 - [`io::Empty` now implements `io::Seek`.][78044]
2034 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2035 `T: ?Sized` types.][80764]
2036 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2042 - [`Arc::decrement_strong_count`]
2043 - [`Arc::increment_strong_count`]
2044 - [`Once::call_once_force`]
2045 - [`Peekable::next_if_eq`]
2046 - [`Peekable::next_if`]
2047 - [`Seek::stream_position`]
2048 - [`array::IntoIter`]
2049 - [`panic::panic_any`]
2051 - [`ptr::addr_of_mut!`]
2052 - [`slice::fill_with`]
2053 - [`slice::split_inclusive_mut`]
2054 - [`slice::split_inclusive`]
2055 - [`slice::strip_prefix`]
2056 - [`slice::strip_suffix`]
2057 - [`str::split_inclusive`]
2058 - [`sync::OnceState`]
2060 - [`VecDeque::range`]
2061 - [`VecDeque::range_mut`]
2065 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2066 codegen option.][cargo/9112]
2067 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2068 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2069 to avoid unifying features of dependencies where that unification could be unwanted.
2070 Such as using the same dependency with a `std` feature in a build scripts and
2071 proc-macros, while using the `no-std` feature in the final binary. See the
2072 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2077 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2078 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2079 documentation.][79642]
2081 Various improvements to intra-doc links:
2083 - [You can link to non-path primitives such as `slice`.][80181]
2084 - [You can link to associated items.][74489]
2085 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2089 - [You can now pass `--include-ignored` to tests (e.g. with
2090 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2095 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2096 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2098 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2099 for the distributed artifacts.][81521]
2100 - `armv5te-unknown-linux-gnueabi`
2101 - `sparc64-unknown-linux-gnu`
2102 - `thumbv7neon-unknown-linux-gnueabihf`
2103 - `armv7-unknown-linux-gnueabi`
2104 - `x86_64-unknown-linux-gnux32`
2105 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2110 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2112 [79135]: https://github.com/rust-lang/rust/pull/79135
2113 [74489]: https://github.com/rust-lang/rust/pull/74489
2114 [76934]: https://github.com/rust-lang/rust/pull/76934
2115 [79570]: https://github.com/rust-lang/rust/pull/79570
2116 [80181]: https://github.com/rust-lang/rust/pull/80181
2117 [79642]: https://github.com/rust-lang/rust/pull/79642
2118 [80945]: https://github.com/rust-lang/rust/pull/80945
2119 [80279]: https://github.com/rust-lang/rust/pull/80279
2120 [80053]: https://github.com/rust-lang/rust/pull/80053
2121 [79502]: https://github.com/rust-lang/rust/pull/79502
2122 [75180]: https://github.com/rust-lang/rust/pull/75180
2123 [81521]: https://github.com/rust-lang/rust/pull/81521
2124 [80968]: https://github.com/rust-lang/rust/pull/80968
2125 [80959]: https://github.com/rust-lang/rust/pull/80959
2126 [80718]: https://github.com/rust-lang/rust/pull/80718
2127 [80653]: https://github.com/rust-lang/rust/pull/80653
2128 [80579]: https://github.com/rust-lang/rust/pull/80579
2129 [79998]: https://github.com/rust-lang/rust/pull/79998
2130 [78044]: https://github.com/rust-lang/rust/pull/78044
2131 [81455]: https://github.com/rust-lang/rust/pull/81455
2132 [80764]: https://github.com/rust-lang/rust/pull/80764
2133 [80749]: https://github.com/rust-lang/rust/pull/80749
2134 [80662]: https://github.com/rust-lang/rust/pull/80662
2135 [79134]: https://github.com/rust-lang/rust/pull/79134
2136 [80966]: https://github.com/rust-lang/rust/pull/80966
2137 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2138 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2139 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2140 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2141 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2142 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2143 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2144 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2145 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2146 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2147 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2148 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2149 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2150 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2151 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2152 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2153 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2154 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2155 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2156 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2157 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2158 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2159 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2161 Version 1.50.0 (2021-02-11)
2162 ============================
2165 -----------------------
2166 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2167 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2168 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2171 -----------------------
2172 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2173 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2174 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2175 - [Dropped support for all cloudabi targets.][78439]
2177 \* Refer to Rust's [platform support page][platform-support-doc] for more
2178 information on Rust's tiered platform support.
2181 -----------------------
2183 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2184 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2185 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2186 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2187 up the same amount of space as `File`.
2193 - [`btree_map::Entry::or_insert_with_key`]
2196 - [`hash_map::Entry::or_insert_with_key`]
2200 - [`UnsafeCell::get_mut`]
2202 The following previously stable methods are now `const`.
2204 - [`IpAddr::is_ipv4`]
2205 - [`IpAddr::is_ipv6`]
2206 - [`IpAddr::is_unspecified`]
2207 - [`IpAddr::is_loopback`]
2208 - [`IpAddr::is_multicast`]
2209 - [`Ipv4Addr::octets`]
2210 - [`Ipv4Addr::is_loopback`]
2211 - [`Ipv4Addr::is_private`]
2212 - [`Ipv4Addr::is_link_local`]
2213 - [`Ipv4Addr::is_multicast`]
2214 - [`Ipv4Addr::is_broadcast`]
2215 - [`Ipv4Addr::is_documentation`]
2216 - [`Ipv4Addr::to_ipv6_compatible`]
2217 - [`Ipv4Addr::to_ipv6_mapped`]
2218 - [`Ipv6Addr::segments`]
2219 - [`Ipv6Addr::is_unspecified`]
2220 - [`Ipv6Addr::is_loopback`]
2221 - [`Ipv6Addr::is_multicast`]
2222 - [`Ipv6Addr::to_ipv4`]
2225 - [`Layout::from_size_align`]
2226 - `pow` for all integer types.
2227 - `checked_pow` for all integer types.
2228 - `saturating_pow` for all integer types.
2229 - `wrapping_pow` for all integer types.
2230 - `next_power_of_two` for all unsigned integer types.
2231 - `checked_next_power_of_two` for all unsigned integer types.
2234 -----------------------
2236 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2237 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2238 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2239 contents of that directory for changes.][cargo/8973]
2240 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2245 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2246 - [Running tests will now print the total time taken to execute.][75752]
2251 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2252 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2253 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2254 unhygenic `macro_rules!` macros.][79472]
2255 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2256 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2257 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2258 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2259 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2260 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2262 [74989]: https://github.com/rust-lang/rust/pull/74989
2263 [79261]: https://github.com/rust-lang/rust/pull/79261
2264 [79896]: https://github.com/rust-lang/rust/pull/79896
2265 [79484]: https://github.com/rust-lang/rust/pull/79484
2266 [79472]: https://github.com/rust-lang/rust/pull/79472
2267 [79270]: https://github.com/rust-lang/rust/pull/79270
2268 [79003]: https://github.com/rust-lang/rust/pull/79003
2269 [78864]: https://github.com/rust-lang/rust/pull/78864
2270 [78636]: https://github.com/rust-lang/rust/pull/78636
2271 [78439]: https://github.com/rust-lang/rust/pull/78439
2272 [78343]: https://github.com/rust-lang/rust/pull/78343
2273 [78296]: https://github.com/rust-lang/rust/pull/78296
2274 [78068]: https://github.com/rust-lang/rust/pull/78068
2275 [75752]: https://github.com/rust-lang/rust/pull/75752
2276 [74699]: https://github.com/rust-lang/rust/pull/74699
2277 [78142]: https://github.com/rust-lang/rust/pull/78142
2278 [77484]: https://github.com/rust-lang/rust/pull/77484
2279 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2280 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2281 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2282 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2283 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2284 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2285 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2286 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2287 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2288 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2289 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2290 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2291 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2292 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2293 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2294 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2295 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2296 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2297 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2298 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2299 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2300 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2301 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2302 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2303 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2304 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2305 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2306 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2307 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2308 [`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
2309 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2310 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2311 [`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
2312 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2315 Version 1.49.0 (2020-12-31)
2316 ============================
2319 -----------------------
2321 - [Unions can now implement `Drop`, and you can now have a field in a union
2322 with `ManuallyDrop<T>`.][77547]
2323 - [You can now cast uninhabited enums to integers.][76199]
2324 - [You can now bind by reference and by move in patterns.][76119] This
2325 allows you to selectively borrow individual components of a type. E.g.
2333 let person = Person {
2334 name: String::from("Alice"),
2338 // `name` is moved out of person, but `age` is referenced.
2339 let Person { name, ref age } = person;
2340 println!("{} {}", name, age);
2344 -----------------------
2346 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2347 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2348 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2349 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2350 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2351 - [Output from threads spawned in tests is now captured.][78227]
2352 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2354 \* Refer to Rust's [platform support page][platform-support-doc] for more
2355 information on Rust's tiered platform support.
2358 -----------------------
2360 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2361 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2366 - [`slice::select_nth_unstable`]
2367 - [`slice::select_nth_unstable_by`]
2368 - [`slice::select_nth_unstable_by_key`]
2370 The following previously stable methods are now `const`.
2372 - [`Poll::is_ready`]
2373 - [`Poll::is_pending`]
2376 -----------------------
2377 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2378 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2379 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2380 variable will be set if the crate being built is one the user selected to build, either
2381 with `-p` or through defaults.
2382 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2388 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2389 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2390 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2391 Previously such invalid or unused attributes could be ignored.
2392 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2393 read [this post about the changes][rustdoc-ws-post] for more details.
2394 - [Trait bounds are no longer inferred for associated types.][79904]
2398 These changes provide no direct user facing benefits, but represent significant
2399 improvements to the internals and overall performance of rustc and
2402 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2403 Local Storage model.][78201]
2404 - [Calculate visibilities once in resolve.][78077]
2405 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2406 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2409 [75991]: https://github.com/rust-lang/rust/pull/75991
2410 [78951]: https://github.com/rust-lang/rust/pull/78951
2411 [78848]: https://github.com/rust-lang/rust/pull/78848
2412 [78746]: https://github.com/rust-lang/rust/pull/78746
2413 [78376]: https://github.com/rust-lang/rust/pull/78376
2414 [78228]: https://github.com/rust-lang/rust/pull/78228
2415 [78227]: https://github.com/rust-lang/rust/pull/78227
2416 [78201]: https://github.com/rust-lang/rust/pull/78201
2417 [78109]: https://github.com/rust-lang/rust/pull/78109
2418 [78077]: https://github.com/rust-lang/rust/pull/78077
2419 [77997]: https://github.com/rust-lang/rust/pull/77997
2420 [77703]: https://github.com/rust-lang/rust/pull/77703
2421 [77547]: https://github.com/rust-lang/rust/pull/77547
2422 [77015]: https://github.com/rust-lang/rust/pull/77015
2423 [76199]: https://github.com/rust-lang/rust/pull/76199
2424 [76119]: https://github.com/rust-lang/rust/pull/76119
2425 [75914]: https://github.com/rust-lang/rust/pull/75914
2426 [79004]: https://github.com/rust-lang/rust/pull/79004
2427 [78676]: https://github.com/rust-lang/rust/pull/78676
2428 [79904]: https://github.com/rust-lang/rust/issues/79904
2429 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2430 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2431 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2432 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2433 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2434 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2435 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2436 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2437 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2438 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2440 Version 1.48.0 (2020-11-19)
2441 ==========================
2446 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2447 is still rejected *semantically*, but can now be parsed by procedural macros.
2451 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2452 `rustc` whether to link its own C runtime and libraries or to rely on a external
2453 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2454 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2455 Note: If you're using cargo you must explicitly pass the `--target` flag.
2456 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2458 \* Refer to Rust's [platform support page][platform-support-doc] for more
2459 information on Rust's tiered platform support.
2463 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2464 and `&Stderr`.][76275]
2465 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2466 - [The `matches!` macro now supports having a trailing comma.][74880]
2467 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2468 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2472 - [`slice::as_ptr_range`]
2473 - [`slice::as_mut_ptr_range`]
2474 - [`VecDeque::make_contiguous`]
2475 - [`future::pending`]
2478 The following previously stable methods are now `const fn`'s:
2480 - [`Option::is_some`]
2481 - [`Option::is_none`]
2482 - [`Option::as_ref`]
2484 - [`Result::is_err`]
2485 - [`Result::as_ref`]
2486 - [`Ordering::reverse`]
2487 - [`Ordering::then`]
2494 - [You can now link to items in `rustdoc` using the intra-doc link
2495 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2496 a link to `std::future`'s documentation. See ["Linking to items by
2497 name"][intradoc-links] for more information.
2498 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2499 when searching through `rustdoc`'s UI.][75740]
2503 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2504 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2505 promoted to `'static` lifetime any more inside `const fn`s.
2506 - [Associated type bindings on trait objects are now verified to meet the bounds
2507 declared on the trait when checking that they implement the trait.][27675]
2508 - [When trait bounds on associated types or opaque types are ambiguous, the
2509 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2510 - [Fixed recursive nonterminals not being expanded in macros during
2511 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2512 correctly handling recursive nonterminal tokens.
2513 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2514 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2515 in places where they have no effect.][73461]
2516 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2517 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2518 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2519 disallow zero-initialization.][71274]
2520 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2521 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2522 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2523 see the [`catch_unwind`] documentation for further information.
2529 These changes provide no direct user facing benefits, but represent significant
2530 improvements to the internals and overall performance of rustc and
2533 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2534 You can continue building with `make` by setting `ninja=false` in
2536 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2537 - [Made `ensure_sufficient_stack()` non-generic][76680]
2539 [78143]: https://github.com/rust-lang/rust/issues/78143
2540 [76680]: https://github.com/rust-lang/rust/pull/76680/
2541 [76030]: https://github.com/rust-lang/rust/pull/76030/
2542 [70212]: https://github.com/rust-lang/rust/pull/70212/
2543 [27675]: https://github.com/rust-lang/rust/issues/27675/
2544 [54121]: https://github.com/rust-lang/rust/issues/54121/
2545 [71274]: https://github.com/rust-lang/rust/pull/71274/
2546 [77386]: https://github.com/rust-lang/rust/pull/77386/
2547 [77153]: https://github.com/rust-lang/rust/pull/77153/
2548 [77055]: https://github.com/rust-lang/rust/pull/77055/
2549 [76275]: https://github.com/rust-lang/rust/pull/76275/
2550 [76310]: https://github.com/rust-lang/rust/pull/76310/
2551 [76420]: https://github.com/rust-lang/rust/pull/76420/
2552 [76158]: https://github.com/rust-lang/rust/pull/76158/
2553 [75857]: https://github.com/rust-lang/rust/pull/75857/
2554 [75585]: https://github.com/rust-lang/rust/pull/75585/
2555 [75740]: https://github.com/rust-lang/rust/pull/75740/
2556 [75502]: https://github.com/rust-lang/rust/pull/75502/
2557 [74880]: https://github.com/rust-lang/rust/pull/74880/
2558 [74922]: https://github.com/rust-lang/rust/pull/74922/
2559 [74430]: https://github.com/rust-lang/rust/pull/74430/
2560 [74194]: https://github.com/rust-lang/rust/pull/74194/
2561 [73461]: https://github.com/rust-lang/rust/pull/73461/
2562 [73166]: https://github.com/rust-lang/rust/pull/73166/
2563 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2564 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2565 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2566 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2567 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2568 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2569 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2570 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2571 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2572 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2573 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2574 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2575 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2576 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2577 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2580 Version 1.47.0 (2020-10-08)
2581 ==========================
2585 - [Closures will now warn when not used.][74869]
2589 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2590 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2592 - [Upgraded to LLVM 11.][73526]
2593 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2594 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2595 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2597 \* Refer to Rust's [platform support page][platform-support-doc] for more
2598 information on Rust's tiered platform support.
2602 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2603 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2604 those of length less than 33.][74060]
2605 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2606 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2607 `PartialEq`, and `PartialOrd`.][73583]
2611 - [`Ident::new_raw`]
2612 - [`Range::is_empty`]
2613 - [`RangeInclusive::is_empty`]
2614 - [`Result::as_deref`]
2615 - [`Result::as_deref_mut`]
2617 - [`pointer::offset_from`]
2621 The following previously stable APIs have now been made const.
2623 - [The `new` method for all `NonZero` integers.][73858]
2624 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2625 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2626 methods for all integers.][73858]
2627 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2628 signed integers.][73858]
2629 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2630 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2631 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2632 `is_ascii_control` methods for `char` and `u8`.][73858]
2636 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2637 You can override this by setting the following in your `Cargo.toml`.
2639 [profile.release.build-override]
2642 - [`cargo-help` will now display man pages for commands rather just the
2643 `--help` text.][cargo/8456]
2644 - [`cargo-metadata` now emits a `test` field indicating if a target has
2645 tests enabled.][cargo/8478]
2646 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2647 - [`cargo-publish` will now use an alternative registry by default if it's the
2648 only registry specified in `package.publish`.][cargo/8571]
2652 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2653 type based search.][75366]
2654 - [Added the Ayu theme to rustdoc.][71237]
2658 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2659 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2660 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2661 help to preserve more span information.][73084] These changes may cause
2662 compilation errors if your macro was unhygenic or didn't correctly handle
2664 - [Moved support for the CloudABI target to tier 3.][75568]
2665 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2666 - [Added the `rustc-docs` component.][75560] This allows you to install
2667 and read the documentation for the compiler internal APIs. (Currently only
2668 available for `x86_64-unknown-linux-gnu`.)
2673 - [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.
2675 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2676 [75048]: https://github.com/rust-lang/rust/pull/75048/
2677 [74163]: https://github.com/rust-lang/rust/pull/74163/
2678 [71237]: https://github.com/rust-lang/rust/pull/71237/
2679 [74869]: https://github.com/rust-lang/rust/pull/74869/
2680 [73858]: https://github.com/rust-lang/rust/pull/73858/
2681 [75716]: https://github.com/rust-lang/rust/pull/75716/
2682 [75560]: https://github.com/rust-lang/rust/pull/75560/
2683 [75568]: https://github.com/rust-lang/rust/pull/75568/
2684 [75366]: https://github.com/rust-lang/rust/pull/75366/
2685 [75204]: https://github.com/rust-lang/rust/pull/75204/
2686 [74650]: https://github.com/rust-lang/rust/pull/74650/
2687 [74419]: https://github.com/rust-lang/rust/pull/74419/
2688 [73964]: https://github.com/rust-lang/rust/pull/73964/
2689 [74021]: https://github.com/rust-lang/rust/pull/74021/
2690 [74060]: https://github.com/rust-lang/rust/pull/74060/
2691 [73893]: https://github.com/rust-lang/rust/pull/73893/
2692 [73526]: https://github.com/rust-lang/rust/pull/73526/
2693 [73583]: https://github.com/rust-lang/rust/pull/73583/
2694 [73084]: https://github.com/rust-lang/rust/pull/73084/
2695 [73197]: https://github.com/rust-lang/rust/pull/73197/
2696 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2697 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2698 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2699 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2700 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2701 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2702 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2703 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2704 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2705 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2706 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2707 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2708 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2709 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2712 Version 1.46.0 (2020-08-27)
2713 ==========================
2717 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2718 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2719 const functions.][73862]
2720 - [The `#[track_caller]` attribute can now be added to functions to use the
2721 function's caller's location information for panic messages.][72445]
2722 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2723 `x.0.0` over `(x.0).0`.
2724 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2725 You currently can't use `mem::transmute` in constant functions.
2729 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2730 - [Enabled static "Position Independent Executables" by default
2731 for `x86_64-unknown-linux-musl`.][70740]
2735 - [`mem::forget` is now a `const fn`.][73887]
2736 - [`String` now implements `From<char>`.][73466]
2737 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2738 integer types.][73032]
2739 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2740 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2741 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2742 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2743 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2744 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2749 - [`vec::Drain::as_slice`]
2753 Added a number of new environment variables that are now available when
2754 compiling your crate.
2756 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2757 the specific binary being compiled and the name of the crate.
2758 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2759 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2763 - [The target configuration option `abi_blacklist` has been renamed
2764 to `unsupported_abis`.][74150] The old name will still continue to work.
2765 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2766 This was previously accepted but will become a hard error in a future release.
2767 - [Rustc will fail to compile if you have a struct with
2768 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2770 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2771 ensure that spans have the correct information, and may cause breakage if you
2772 were relying on receiving spans with dummy information.
2773 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2774 a legacy installer that was replaced by a MSI installer a few years ago but
2775 was still being built.
2776 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2777 - [Rustc will no longer accept overlapping trait implementations that only
2778 differ in how the lifetime was bound.][72493]
2779 - [Rustc now correctly relates the lifetime of an existential associated
2780 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2781 you to pass a shorter lifetime than expected.
2782 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2783 The library will need to be installed for `rustc` to work, even though we
2784 expect it to be already available on most systems.
2785 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2787 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2788 exact output returned by rustc's pretty printing is an unstable
2789 implementation detail: we recommend any macro relying on it to switch to a
2790 more robust parsing system.
2792 [75453]: https://github.com/rust-lang/rust/issues/75453/
2793 [74820]: https://github.com/rust-lang/rust/issues/74820/
2794 [74420]: https://github.com/rust-lang/rust/issues/74420/
2795 [74109]: https://github.com/rust-lang/rust/pull/74109/
2796 [74150]: https://github.com/rust-lang/rust/pull/74150/
2797 [73862]: https://github.com/rust-lang/rust/pull/73862/
2798 [73887]: https://github.com/rust-lang/rust/pull/73887/
2799 [73466]: https://github.com/rust-lang/rust/pull/73466/
2800 [73516]: https://github.com/rust-lang/rust/pull/73516/
2801 [73293]: https://github.com/rust-lang/rust/pull/73293/
2802 [73007]: https://github.com/rust-lang/rust/pull/73007/
2803 [73032]: https://github.com/rust-lang/rust/pull/73032/
2804 [72920]: https://github.com/rust-lang/rust/pull/72920/
2805 [72569]: https://github.com/rust-lang/rust/pull/72569/
2806 [72583]: https://github.com/rust-lang/rust/pull/72583/
2807 [72584]: https://github.com/rust-lang/rust/pull/72584/
2808 [72717]: https://github.com/rust-lang/rust/pull/72717/
2809 [72437]: https://github.com/rust-lang/rust/pull/72437/
2810 [72445]: https://github.com/rust-lang/rust/pull/72445/
2811 [72486]: https://github.com/rust-lang/rust/pull/72486/
2812 [72493]: https://github.com/rust-lang/rust/pull/72493/
2813 [72331]: https://github.com/rust-lang/rust/pull/72331/
2814 [71896]: https://github.com/rust-lang/rust/pull/71896/
2815 [71660]: https://github.com/rust-lang/rust/pull/71660/
2816 [71322]: https://github.com/rust-lang/rust/pull/71322/
2817 [70740]: https://github.com/rust-lang/rust/pull/70740/
2818 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2819 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2820 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2821 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2822 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2825 Version 1.45.2 (2020-08-03)
2826 ==========================
2828 * [Fix bindings in tuple struct patterns][74954]
2829 * [Fix track_caller integration with trait objects][74784]
2831 [74954]: https://github.com/rust-lang/rust/issues/74954
2832 [74784]: https://github.com/rust-lang/rust/issues/74784
2835 Version 1.45.1 (2020-07-30)
2836 ==========================
2838 * [Fix const propagation with references.][73613]
2839 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2840 * [Avoid spurious implicit region bound.][74509]
2841 * [Install clippy on x.py install][74457]
2843 [73613]: https://github.com/rust-lang/rust/pull/73613
2844 [73078]: https://github.com/rust-lang/rust/issues/73078
2845 [74509]: https://github.com/rust-lang/rust/pull/74509
2846 [74457]: https://github.com/rust-lang/rust/pull/74457
2849 Version 1.45.0 (2020-07-16)
2850 ==========================
2854 - [Out of range float to int conversions using `as` has been defined as a saturating
2855 conversion.][71269] This was previously undefined behaviour, but you can use the
2856 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2857 may be desirable in rare performance sensitive situations.
2858 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2859 using `u64`.][70705]
2860 - [Function like procedural macros can now be used in expression, pattern, and statement
2861 positions.][68717] This means you can now use a function-like procedural macro
2862 anywhere you can use a declarative (`macro_rules!`) macro.
2866 - [You can now override individual target features through the `target-feature`
2867 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2868 equivalent to `-C target-feature=+avx2,+fma`.
2869 - [Added the `force-unwind-tables` flag.][69984] This option allows
2870 rustc to always generate unwind tables regardless of panic strategy.
2871 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2872 to include LLVM bitcode into generated `rlib`s (this is on by default).
2873 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2874 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2875 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2876 - [Upgraded to LLVM 10.][67759]
2878 \* Refer to Rust's [platform support page][platform-support-doc] for more
2879 information on Rust's tiered platform support.
2884 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2886 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2887 - [You can now use `char` with
2888 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2889 a range of codepoints.][72413] E.g.
2890 you can now write the following;
2892 for ch in 'a'..='z' {
2896 // Prints "abcdefghijklmnopqrstuvwxyz"
2898 - [`OsString` now implements `FromStr`.][71662]
2899 - [The `saturating_neg` method has been added to all signed integer primitive
2900 types, and the `saturating_abs` method has been added for all integer
2901 primitive types.][71886]
2902 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2903 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2905 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2906 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2907 integer types.][69813]
2908 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2909 integer types.][72324]
2910 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2915 - [`BTreeMap::remove_entry`]
2917 - [`rc::Weak::as_ptr`]
2918 - [`rc::Weak::from_raw`]
2919 - [`rc::Weak::into_raw`]
2920 - [`str::strip_prefix`]
2921 - [`str::strip_suffix`]
2922 - [`sync::Weak::as_ptr`]
2923 - [`sync::Weak::from_raw`]
2924 - [`sync::Weak::into_raw`]
2925 - [`char::UNICODE_VERSION`]
2926 - [`Span::resolved_at`]
2927 - [`Span::located_at`]
2928 - [`Span::mixed_site`]
2929 - [`unix::process::CommandExt::arg0`]
2934 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2939 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2940 `~~outdated information~~` becomes "~~outdated information~~".
2941 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2945 - [Trying to self initialize a static value (that is creating a value using
2946 itself) is unsound and now causes a compile error.][71140]
2947 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2948 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2949 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2950 previously undocumented and not intended for public use. Rustdoc still provides
2951 a non-zero exit code on errors.
2952 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2953 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2954 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2955 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2956 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2960 - [Make clippy a git subtree instead of a git submodule][70655]
2961 - [Unify the undo log of all snapshot types][69464]
2963 [71848]: https://github.com/rust-lang/rust/issues/71848/
2964 [73420]: https://github.com/rust-lang/rust/issues/73420/
2965 [72324]: https://github.com/rust-lang/rust/pull/72324/
2966 [71843]: https://github.com/rust-lang/rust/pull/71843/
2967 [71886]: https://github.com/rust-lang/rust/pull/71886/
2968 [72234]: https://github.com/rust-lang/rust/pull/72234/
2969 [72239]: https://github.com/rust-lang/rust/pull/72239/
2970 [72397]: https://github.com/rust-lang/rust/pull/72397/
2971 [72413]: https://github.com/rust-lang/rust/pull/72413/
2972 [72014]: https://github.com/rust-lang/rust/pull/72014/
2973 [72062]: https://github.com/rust-lang/rust/pull/72062/
2974 [72094]: https://github.com/rust-lang/rust/pull/72094/
2975 [72133]: https://github.com/rust-lang/rust/pull/72133/
2976 [67759]: https://github.com/rust-lang/rust/pull/67759/
2977 [71900]: https://github.com/rust-lang/rust/pull/71900/
2978 [71928]: https://github.com/rust-lang/rust/pull/71928/
2979 [71662]: https://github.com/rust-lang/rust/pull/71662/
2980 [71716]: https://github.com/rust-lang/rust/pull/71716/
2981 [71447]: https://github.com/rust-lang/rust/pull/71447/
2982 [71269]: https://github.com/rust-lang/rust/pull/71269/
2983 [71095]: https://github.com/rust-lang/rust/pull/71095/
2984 [71140]: https://github.com/rust-lang/rust/pull/71140/
2985 [70655]: https://github.com/rust-lang/rust/pull/70655/
2986 [70705]: https://github.com/rust-lang/rust/pull/70705/
2987 [69984]: https://github.com/rust-lang/rust/pull/69984/
2988 [69813]: https://github.com/rust-lang/rust/pull/69813/
2989 [69464]: https://github.com/rust-lang/rust/pull/69464/
2990 [68717]: https://github.com/rust-lang/rust/pull/68717/
2991 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2992 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2993 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2994 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2995 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2996 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2997 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2998 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2999 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3000 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3001 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3002 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3003 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3004 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3005 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3006 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3007 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3010 Version 1.44.1 (2020-06-18)
3011 ===========================
3013 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3014 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3015 * [Fix crashes when finding backtrace on macOS.][71397]
3016 * [Clippy applies lint levels into different files.][clippy/5356]
3018 [71397]: https://github.com/rust-lang/rust/issues/71397
3019 [73078]: https://github.com/rust-lang/rust/issues/73078
3020 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3021 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3024 Version 1.44.0 (2020-06-04)
3025 ==========================
3029 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3030 - [Added the `unused_braces` lint.][70081]
3032 **Syntax-only changes**
3034 - [Expansion-driven outline module parsing][69838]
3039 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3044 These are still rejected semantically, so you will likely receive an error but
3045 these changes can be seen and parsed by macros and conditional compilation.
3049 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3050 Additionally when in incremental mode rustc defaults to 256 codegen units.
3051 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3052 a panic is thrown.][67502]
3053 - [Added tier 3\* support for the `aarch64-unknown-none` and
3054 `aarch64-unknown-none-softfloat` targets.][68334]
3055 - [Added tier 3 support for `arm64-apple-tvos` and
3056 `x86_64-apple-tvos` targets.][68191]
3061 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3062 `vec![]` to be able to be used in `const` contexts.
3063 - [`convert::Infallible` now implements `Hash`.][70281]
3064 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3065 a `&mut OsStr`.][70048]
3066 - [Unicode 13 is now supported.][69929]
3067 - [`String` now implements `From<&mut str>`.][69661]
3068 - [`IoSlice` now implements `Copy`.][69403]
3069 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3070 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3071 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3072 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3073 integer types.][69373]
3077 - [`PathBuf::with_capacity`]
3078 - [`PathBuf::capacity`]
3079 - [`PathBuf::clear`]
3080 - [`PathBuf::reserve`]
3081 - [`PathBuf::reserve_exact`]
3082 - [`PathBuf::shrink_to_fit`]
3083 - [`f32::to_int_unchecked`]
3084 - [`f64::to_int_unchecked`]
3085 - [`Layout::align_to`]
3086 - [`Layout::pad_to_align`]
3088 - [`Layout::extend`]
3092 - [Added the `cargo tree` command which will print a tree graph of
3093 your dependencies.][cargo/8062] E.g.
3095 mdbook v0.3.2 (/Users/src/rust/mdbook)
3097 │ ├── html5ever v0.24.0
3099 │ │ │ └── cfg-if v0.1.9
3101 │ │ └── markup5ever v0.9.0
3102 │ │ ├── log v0.4.8 (*)
3104 │ │ │ └── phf_shared v0.7.24
3105 │ │ │ ├── siphasher v0.2.3
3106 │ │ │ └── unicase v1.4.2
3107 │ │ │ [build-dependencies]
3108 │ │ │ └── version_check v0.1.5
3111 You can also display dependencies on multiple versions of the same crate with
3112 `cargo tree -d` (short for `cargo tree --duplicates`).
3116 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3117 the version in the sidebar.][69494]
3121 - [Rustc now correctly generates static libraries on Windows GNU targets with
3122 the `.a` extension, rather than the previous `.lib`.][70937]
3123 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3124 - [The `file_name` property in JSON output of macro errors now points the actual
3125 source file rather than the previous format of `<NAME macros>`.][70969]
3126 **Note:** this may not point to a file that actually exists on the user's system.
3127 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3128 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3129 not allow zero initialization such as `NonZeroU8`.][66059] This was
3130 previously a warning.
3131 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3132 operator has been defined as a saturating operation.][71269] This was previously
3133 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3134 continue using the current behaviour, which may be desirable in rare performance
3135 sensitive situations.
3139 These changes provide no direct user facing benefits, but represent significant
3140 improvements to the internals and overall performance of rustc and
3143 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3144 - [Replace big JS dict with JSON parsing.][71250]
3146 [69373]: https://github.com/rust-lang/rust/pull/69373/
3147 [66059]: https://github.com/rust-lang/rust/pull/66059/
3148 [68191]: https://github.com/rust-lang/rust/pull/68191/
3149 [68899]: https://github.com/rust-lang/rust/pull/68899/
3150 [71147]: https://github.com/rust-lang/rust/pull/71147/
3151 [71250]: https://github.com/rust-lang/rust/pull/71250/
3152 [70937]: https://github.com/rust-lang/rust/pull/70937/
3153 [70969]: https://github.com/rust-lang/rust/pull/70969/
3154 [70632]: https://github.com/rust-lang/rust/pull/70632/
3155 [70281]: https://github.com/rust-lang/rust/pull/70281/
3156 [70345]: https://github.com/rust-lang/rust/pull/70345/
3157 [70048]: https://github.com/rust-lang/rust/pull/70048/
3158 [70081]: https://github.com/rust-lang/rust/pull/70081/
3159 [70156]: https://github.com/rust-lang/rust/pull/70156/
3160 [71269]: https://github.com/rust-lang/rust/pull/71269/
3161 [69838]: https://github.com/rust-lang/rust/pull/69838/
3162 [69929]: https://github.com/rust-lang/rust/pull/69929/
3163 [69661]: https://github.com/rust-lang/rust/pull/69661/
3164 [69778]: https://github.com/rust-lang/rust/pull/69778/
3165 [69494]: https://github.com/rust-lang/rust/pull/69494/
3166 [69403]: https://github.com/rust-lang/rust/pull/69403/
3167 [69033]: https://github.com/rust-lang/rust/pull/69033/
3168 [68692]: https://github.com/rust-lang/rust/pull/68692/
3169 [68334]: https://github.com/rust-lang/rust/pull/68334/
3170 [67502]: https://github.com/rust-lang/rust/pull/67502/
3171 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3172 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3173 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3174 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3175 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3176 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3177 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3178 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3179 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3180 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3181 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3182 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3183 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3186 Version 1.43.1 (2020-05-07)
3187 ===========================
3189 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3190 * [Fixed the stabilization of AVX-512 features.][71473]
3191 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3193 [71430]: https://github.com/rust-lang/rust/pull/71430
3194 [71473]: https://github.com/rust-lang/rust/issues/71473
3195 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3198 Version 1.43.0 (2020-04-23)
3199 ==========================
3203 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3204 the type inferred correctly.][68129]
3205 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3207 **Syntax only changes**
3208 - [Allow `type Foo: Ord` syntactically.][69361]
3209 - [Fuse associated and extern items up to defaultness.][69194]
3210 - [Syntactically allow `self` in all `fn` contexts.][68764]
3211 - [Merge `fn` syntax + cleanup item parsing.][68728]
3212 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3213 For example, you may now write:
3215 macro_rules! mac_trait {
3225 These are still rejected *semantically*, so you will likely receive an error but
3226 these changes can be seen and parsed by macros and
3227 conditional compilation.
3232 - [You can now pass multiple lint flags to rustc to override the previous
3233 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3234 everything in the `unused` lint group except `unused-variables` which
3235 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3236 everything in the `unused` lint group **including** `unused-variables` since
3237 the allow flag is specified before the deny flag (and therefore overridden).
3238 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3239 if they are available on `windows-gnu`.][67429]
3240 - [rustc now buffers errors/warnings printed in JSON.][69227]
3244 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3245 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3246 respectively.][69538] **Note** These conversions are only available when `N`
3248 - [You can now use associated constants on floats and integers directly, rather
3249 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3250 `f32::NAN` with no imports.
3251 - [`u8::is_ascii` is now `const`.][68984]
3252 - [`String` now implements `AsMut<str>`.][68742]
3253 - [Added the `primitive` module to `std` and `core`.][67637] This module
3254 reexports Rust's primitive types. This is mainly useful in macros
3255 where you want avoid these types being shadowed.
3256 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3257 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3261 - [`Once::is_completed`]
3266 - [`iter::once_with`]
3270 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3271 your environment.][cargo/7823]
3272 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3273 executable path when running integration tests or benchmarks.][cargo/7697]
3274 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3275 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3279 - [Certain checks in the `const_err` lint were deemed unrelated to const
3280 evaluation][69185], and have been moved to the `unconditional_panic` and
3281 `arithmetic_overflow` lints.
3286 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3287 has been a warning since 1.36.0.
3288 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3289 led to some instances being accepted, and now correctly emits a hard error.
3291 [69340]: https://github.com/rust-lang/rust/pull/69340
3295 These changes provide no direct user facing benefits, but represent significant
3296 improvements to the internals and overall performance of `rustc` and
3299 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3300 - [Improved how rustc generates drop code.][67332]
3301 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3302 - [traits: preallocate 2 Vecs of known initial size][69022]
3303 - [Avoid exponential behaviour when relating types][68772]
3304 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3305 - [Improve performance of coherence checks][68966]
3306 - [Deduplicate types in the generator witness][68672]
3307 - [Invert control in struct_lint_level.][68725]
3309 [67332]: https://github.com/rust-lang/rust/pull/67332/
3310 [67429]: https://github.com/rust-lang/rust/pull/67429/
3311 [67637]: https://github.com/rust-lang/rust/pull/67637/
3312 [67642]: https://github.com/rust-lang/rust/pull/67642/
3313 [67878]: https://github.com/rust-lang/rust/pull/67878/
3314 [67885]: https://github.com/rust-lang/rust/pull/67885/
3315 [68129]: https://github.com/rust-lang/rust/pull/68129/
3316 [68672]: https://github.com/rust-lang/rust/pull/68672/
3317 [68725]: https://github.com/rust-lang/rust/pull/68725/
3318 [68728]: https://github.com/rust-lang/rust/pull/68728/
3319 [68738]: https://github.com/rust-lang/rust/pull/68738/
3320 [68742]: https://github.com/rust-lang/rust/pull/68742/
3321 [68764]: https://github.com/rust-lang/rust/pull/68764/
3322 [68772]: https://github.com/rust-lang/rust/pull/68772/
3323 [68943]: https://github.com/rust-lang/rust/pull/68943/
3324 [68952]: https://github.com/rust-lang/rust/pull/68952/
3325 [68966]: https://github.com/rust-lang/rust/pull/68966/
3326 [68984]: https://github.com/rust-lang/rust/pull/68984/
3327 [69022]: https://github.com/rust-lang/rust/pull/69022/
3328 [69185]: https://github.com/rust-lang/rust/pull/69185/
3329 [69194]: https://github.com/rust-lang/rust/pull/69194/
3330 [69201]: https://github.com/rust-lang/rust/pull/69201/
3331 [69227]: https://github.com/rust-lang/rust/pull/69227/
3332 [69548]: https://github.com/rust-lang/rust/pull/69548/
3333 [69256]: https://github.com/rust-lang/rust/pull/69256/
3334 [69361]: https://github.com/rust-lang/rust/pull/69361/
3335 [69366]: https://github.com/rust-lang/rust/pull/69366/
3336 [69538]: https://github.com/rust-lang/rust/pull/69538/
3337 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3338 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3339 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3340 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3341 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3342 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3343 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3344 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3347 Version 1.42.0 (2020-03-12)
3348 ==========================
3352 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3354 fn foo(words: &[&str]) {
3356 ["Hello", "World", "!", ..] => println!("Hello World!"),
3357 ["Foo", "Bar", ..] => println!("Baz"),
3358 rest => println!("{:?}", rest),
3362 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3363 that you can create an enum that has the exact layout and ABI of the type
3365 - [You can now use outer attribute procedural macros on inline modules.][64273]
3366 - [There are some *syntax-only* changes:][67131]
3367 - `default` is syntactically allowed before items in `trait` definitions.
3368 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3369 leave out their bodies in favor of `;`.
3370 - Bounds on associated types in `impl`s are now syntactically allowed
3371 (e.g. `type Foo: Ord;`).
3372 - `...` (the C-variadic type) may occur syntactically directly as the type of
3373 any function parameter.
3375 These are still rejected *semantically*, so you will likely receive an error
3376 but these changes can be seen and parsed by procedural macros and
3377 conditional compilation.
3381 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3382 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3383 - [`Option::{expect,unwrap}` and
3384 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3385 pointing to the location where they were called, rather than
3386 `core`'s internals. ][67887]
3388 \* Refer to Rust's [platform support page][platform-support-doc] for more
3389 information on Rust's tiered platform support.
3393 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3394 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3395 to implement `Sized`.][67935]
3396 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3397 - [`Layout::new` is now `const`.][66254]
3398 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3403 - [`CondVar::wait_while`]
3404 - [`CondVar::wait_timeout_while`]
3406 - [`DebugMap::value`]
3407 - [`ManuallyDrop::take`]
3409 - [`ptr::slice_from_raw_parts_mut`]
3410 - [`ptr::slice_from_raw_parts`]
3414 - [You no longer need to include `extern crate proc_macro;` to be able to
3415 `use proc_macro;` in the `2018` edition.][cargo/7700]
3419 - [`Error::description` has been deprecated, and its use will now produce a
3420 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3422 [68253]: https://github.com/rust-lang/rust/pull/68253/
3423 [68348]: https://github.com/rust-lang/rust/pull/68348/
3424 [67935]: https://github.com/rust-lang/rust/pull/67935/
3425 [68339]: https://github.com/rust-lang/rust/pull/68339/
3426 [68122]: https://github.com/rust-lang/rust/pull/68122/
3427 [64273]: https://github.com/rust-lang/rust/pull/64273/
3428 [67712]: https://github.com/rust-lang/rust/pull/67712/
3429 [67887]: https://github.com/rust-lang/rust/pull/67887/
3430 [67131]: https://github.com/rust-lang/rust/pull/67131/
3431 [67233]: https://github.com/rust-lang/rust/pull/67233/
3432 [66899]: https://github.com/rust-lang/rust/pull/66899/
3433 [66919]: https://github.com/rust-lang/rust/pull/66919/
3434 [66254]: https://github.com/rust-lang/rust/pull/66254/
3435 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3436 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3437 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3438 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3439 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3440 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3441 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3442 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3443 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3446 Version 1.41.1 (2020-02-27)
3447 ===========================
3449 * [Always check types of static items][69145]
3450 * [Always check lifetime bounds of `Copy` impls][69145]
3451 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3453 [69225]: https://github.com/rust-lang/rust/issues/69225
3454 [69145]: https://github.com/rust-lang/rust/pull/69145
3457 Version 1.41.0 (2020-01-30)
3458 ===========================
3463 - [You can now pass type parameters to foreign items when implementing
3464 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3465 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3466 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3467 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3468 - [You can now use any valid identifier in a `format_args` macro.][66847]
3469 Previously identifiers starting with an underscore were not allowed.
3470 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3471 enum variants.][66183] These are still rejected semantically, but
3472 can be seen and parsed by procedural macros and conditional compilation.
3473 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3474 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3475 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3477 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3482 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3483 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3484 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3485 - [You can now pass an arguments file passing the `@path` syntax
3486 to rustc.][66172] Note that the format differs somewhat from what is
3487 found in other tooling; please see [the documentation][argfile-docs] for
3489 - [You can now provide `--extern` flag without a path, indicating that it is
3490 available from the search path or specified with an `-L` flag.][64882]
3492 \* Refer to Rust's [platform support page][platform-support-doc] for more
3493 information on Rust's tiered platform support.
3495 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3500 - [The `core::panic` module is now stable.][66771] It was already stable
3502 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3503 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3504 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3509 - [`Result::map_or`]
3510 - [`Result::map_or_else`]
3511 - [`std::rc::Weak::weak_count`]
3512 - [`std::rc::Weak::strong_count`]
3513 - [`std::sync::Weak::weak_count`]
3514 - [`std::sync::Weak::strong_count`]
3519 - [Cargo will now document all the private items for binary crates
3520 by default.][cargo/7593]
3521 - [`cargo-install` will now reinstall the package if it detects that it is out
3522 of date.][cargo/7560]
3523 - [Cargo.lock now uses a more git friendly format that should help to reduce
3524 merge conflicts.][cargo/7579]
3525 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3526 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3527 optimisation level to `2` for debug builds. You can also use
3528 `[profile.<profile>.build-override]` to override build scripts and
3534 - [You can now specify `edition` in documentation code blocks to compile the block
3535 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3536 should be compiled the 2018 edition of Rust.
3537 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3538 current theme with `--check-theme`.][54733]
3539 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3544 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3545 Apple targets.][apple-32bit-drop] This means that the source code is still
3546 available to build, but the targets are no longer being tested and release
3547 binaries for those platforms will no longer be distributed by the Rust project.
3548 Please refer to the linked blog post for more information.
3550 [54733]: https://github.com/rust-lang/rust/pull/54733/
3551 [61351]: https://github.com/rust-lang/rust/pull/61351/
3552 [62514]: https://github.com/rust-lang/rust/pull/62514/
3553 [67255]: https://github.com/rust-lang/rust/pull/67255/
3554 [66661]: https://github.com/rust-lang/rust/pull/66661/
3555 [66771]: https://github.com/rust-lang/rust/pull/66771/
3556 [66847]: https://github.com/rust-lang/rust/pull/66847/
3557 [66238]: https://github.com/rust-lang/rust/pull/66238/
3558 [66277]: https://github.com/rust-lang/rust/pull/66277/
3559 [66325]: https://github.com/rust-lang/rust/pull/66325/
3560 [66172]: https://github.com/rust-lang/rust/pull/66172/
3561 [66183]: https://github.com/rust-lang/rust/pull/66183/
3562 [65879]: https://github.com/rust-lang/rust/pull/65879/
3563 [65013]: https://github.com/rust-lang/rust/pull/65013/
3564 [64882]: https://github.com/rust-lang/rust/pull/64882/
3565 [64325]: https://github.com/rust-lang/rust/pull/64325/
3566 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3567 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3568 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3569 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3570 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3571 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3572 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3573 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3574 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3575 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3576 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3578 Version 1.40.0 (2019-12-19)
3579 ===========================
3583 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3584 `const` contexts.][65188] e.g.
3587 pub struct Point(i32, i32);
3589 const ORIGIN: Point = {
3590 let constructor = Point;
3596 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3597 indicate that there may be variants or fields added in the future.][64639]
3598 For example this requires adding a wild-card branch (`_ => {}`) to any match
3599 statements on a non-exhaustive `enum`. [(RFC 2008)]
3600 - [You can now use function-like procedural macros in `extern` blocks and in
3601 type positions.][63931] e.g. `type Generated = macro!();`
3602 - [Function-like and attribute procedural macros can now emit
3603 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3604 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3605 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3606 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3610 - [Added tier 3 support\* for the
3611 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3612 - [Added tier 3 support for the
3613 `aarch64-unknown-none-softfloat` target.][64589]
3614 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3615 `mips64el-unknown-linux-muslabi64` targets.][65843]
3617 \* Refer to Rust's [platform support page][platform-support-doc] for more
3618 information on Rust's tiered platform support.
3622 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3626 - [`BTreeMap::get_key_value`]
3627 - [`HashMap::get_key_value`]
3628 - [`Option::as_deref_mut`]
3629 - [`Option::as_deref`]
3630 - [`Option::flatten`]
3631 - [`UdpSocket::peer_addr`]
3632 - [`f32::to_be_bytes`]
3633 - [`f32::to_le_bytes`]
3634 - [`f32::to_ne_bytes`]
3635 - [`f64::to_be_bytes`]
3636 - [`f64::to_le_bytes`]
3637 - [`f64::to_ne_bytes`]
3638 - [`f32::from_be_bytes`]
3639 - [`f32::from_le_bytes`]
3640 - [`f32::from_ne_bytes`]
3641 - [`f64::from_be_bytes`]
3642 - [`f64::from_le_bytes`]
3643 - [`f64::from_ne_bytes`]
3650 - [Cargo will now always display warnings, rather than only on
3651 fresh builds.][cargo/7450]
3652 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3653 now produce an error.][cargo/7507] Previously these flags were ignored.
3654 - [You can now publish `dev-dependencies` without including
3655 a `version`.][cargo/7333]
3659 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3660 when running documentation tests with `rustdoc`.][63803]
3664 - [As previously announced, any previous NLL warnings in the 2015 edition are
3665 now hard errors.][64221]
3666 - [The `include!` macro will now warn if it failed to include the
3667 entire file.][64284] The `include!` macro unintentionally only includes the
3668 first _expression_ in a file, and this can be unintuitive. This will become
3669 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3670 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3671 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3672 or `extern` blocks now correctly emits a hard error.
3674 [65294]: https://github.com/rust-lang/rust/pull/65294/
3675 [66103]: https://github.com/rust-lang/rust/pull/66103/
3676 [65843]: https://github.com/rust-lang/rust/pull/65843/
3677 [65188]: https://github.com/rust-lang/rust/pull/65188/
3678 [65092]: https://github.com/rust-lang/rust/pull/65092/
3679 [64589]: https://github.com/rust-lang/rust/pull/64589/
3680 [64639]: https://github.com/rust-lang/rust/pull/64639/
3681 [64221]: https://github.com/rust-lang/rust/pull/64221/
3682 [64284]: https://github.com/rust-lang/rust/pull/64284/
3683 [63931]: https://github.com/rust-lang/rust/pull/63931/
3684 [64035]: https://github.com/rust-lang/rust/pull/64035/
3685 [63674]: https://github.com/rust-lang/rust/pull/63674/
3686 [63803]: https://github.com/rust-lang/rust/pull/63803/
3687 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3688 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3689 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3690 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3691 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3692 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3693 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3694 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3695 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3696 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3697 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3698 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3699 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3700 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3701 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3702 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3703 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3704 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3705 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3706 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3707 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3708 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3709 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3710 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3711 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3714 Version 1.39.0 (2019-11-07)
3715 ===========================
3719 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3720 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3721 - [You can now use certain attributes on function, closure, and function pointer
3722 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3723 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3724 attributes applied to items. e.g.
3727 #[cfg(windows)] slice: &[u16],
3728 #[cfg(not(windows))] slice: &[u8],
3733 - [You can now take shared references to bind-by-move patterns in the `if` guards
3734 of `match` arms.][63118] e.g.
3737 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3741 // ---- `nums` is bound by move.
3742 if nums.iter().sum::<u8>() == 10
3743 // ^------ `.iter()` implicitly takes a reference to `nums`.
3746 // ----------- Legal as `nums` was bound by move and so we have ownership.
3748 _ => unreachable!(),
3757 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3758 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3759 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3760 **Note** Cargo currently doesn't use this feature. Refer to
3761 [cargo#7315][cargo/7315] to track this feature's progress.
3762 - [You can now pass `--show-output` argument to test binaries to print the
3763 output of successful tests.][62600]
3766 \* Refer to Rust's [platform support page][platform-support-doc] for more
3767 information on Rust's tiered platform support.
3771 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3772 - [`LinkedList::new` is now a `const` function.][63684]
3773 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3774 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3775 now `const`.][63786]
3779 - [`Pin::into_inner`]
3780 - [`Instant::checked_duration_since`]
3781 - [`Instant::saturating_duration_since`]
3785 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3786 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3787 `--all` is now deprecated.
3791 - [You can now pass `-Clinker` to rustdoc to control the linker used
3792 for compiling doctests.][63834]
3796 - [Code that was previously accepted by the old borrow checker, but rejected by
3797 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3798 previously a warning, and will also become a hard error in the Rust 2015
3799 edition in the 1.40.0 release.
3800 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3801 run tests.][63827] This should improve performance when running a large
3803 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3804 recommended to use the `?` operator instead.
3805 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3808 [62600]: https://github.com/rust-lang/rust/pull/62600/
3809 [62672]: https://github.com/rust-lang/rust/pull/62672/
3810 [63118]: https://github.com/rust-lang/rust/pull/63118/
3811 [63209]: https://github.com/rust-lang/rust/pull/63209/
3812 [63402]: https://github.com/rust-lang/rust/pull/63402/
3813 [63565]: https://github.com/rust-lang/rust/pull/63565/
3814 [63595]: https://github.com/rust-lang/rust/pull/63595/
3815 [63684]: https://github.com/rust-lang/rust/pull/63684/
3816 [63698]: https://github.com/rust-lang/rust/pull/63698/
3817 [63770]: https://github.com/rust-lang/rust/pull/63770/
3818 [63786]: https://github.com/rust-lang/rust/pull/63786/
3819 [63827]: https://github.com/rust-lang/rust/pull/63827/
3820 [63834]: https://github.com/rust-lang/rust/pull/63834/
3821 [64010]: https://github.com/rust-lang/rust/pull/64010/
3822 [64028]: https://github.com/rust-lang/rust/pull/64028/
3823 [64334]: https://github.com/rust-lang/rust/pull/64334/
3824 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3825 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3826 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3827 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3828 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3829 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3831 Version 1.38.0 (2019-09-26)
3832 ==========================
3836 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3837 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3841 - [Added pipelined compilation support to `rustc`.][62766] This will
3842 improve compilation times in some cases. For further information please refer
3843 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3844 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3845 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3846 `x86_64-uwp-windows-msvc` targets.][60260]
3847 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3848 `armv7-unknown-linux-musleabi` targets.][63107]
3849 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3850 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3851 - [Upgraded to LLVM 9.][62592]
3853 \* Refer to Rust's [platform support page][platform-support-doc] for more
3854 information on Rust's tiered platform support.
3858 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3859 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3860 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3861 is available at `std::clone::Clone`). This also makes all built-in macros
3862 available in `std`/`core` root. e.g. `std::include_bytes!`.
3863 - [`str::Chars` now implements `Debug`.][63000]
3864 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3865 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3866 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3867 - [Added euclidean remainder and division operations (`div_euclid`,
3868 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3869 `overflowing`, and `wrapping` versions are available for all
3871 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3872 `PartialEq`.][61491]
3873 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3877 - [`<*const T>::cast`]
3878 - [`<*mut T>::cast`]
3879 - [`Duration::as_secs_f32`]
3880 - [`Duration::as_secs_f64`]
3881 - [`Duration::div_f32`]
3882 - [`Duration::div_f64`]
3883 - [`Duration::from_secs_f32`]
3884 - [`Duration::from_secs_f64`]
3885 - [`Duration::mul_f32`]
3886 - [`Duration::mul_f64`]
3887 - [`any::type_name`]
3891 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3892 - [You can now pass the `--features` option multiple times to enable
3893 multiple features.][cargo/7084]
3898 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3902 - [`rustc` will now warn about some incorrect uses of
3903 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3907 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3909 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3910 issues][62896] with certain crates such as libc.
3912 [60260]: https://github.com/rust-lang/rust/pull/60260/
3913 [61457]: https://github.com/rust-lang/rust/pull/61457/
3914 [61491]: https://github.com/rust-lang/rust/pull/61491/
3915 [61884]: https://github.com/rust-lang/rust/pull/61884/
3916 [61953]: https://github.com/rust-lang/rust/pull/61953/
3917 [62042]: https://github.com/rust-lang/rust/pull/62042/
3918 [62528]: https://github.com/rust-lang/rust/pull/62528/
3919 [62583]: https://github.com/rust-lang/rust/pull/62583/
3920 [62735]: https://github.com/rust-lang/rust/pull/62735/
3921 [62766]: https://github.com/rust-lang/rust/pull/62766/
3922 [62784]: https://github.com/rust-lang/rust/pull/62784/
3923 [62592]: https://github.com/rust-lang/rust/pull/62592/
3924 [62785]: https://github.com/rust-lang/rust/issues/62785/
3925 [62814]: https://github.com/rust-lang/rust/pull/62814/
3926 [62896]: https://github.com/rust-lang/rust/issues/62896/
3927 [63000]: https://github.com/rust-lang/rust/pull/63000/
3928 [63056]: https://github.com/rust-lang/rust/pull/63056/
3929 [63107]: https://github.com/rust-lang/rust/pull/63107/
3930 [63346]: https://github.com/rust-lang/rust/pull/63346/
3931 [63421]: https://github.com/rust-lang/rust/pull/63421/
3932 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3933 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3934 [63048]: https://github.com/rust-lang/rust/pull/63048
3935 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3936 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3937 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3938 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3939 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3940 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3941 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3942 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3943 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3944 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3945 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3946 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3947 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3949 Version 1.37.0 (2019-08-15)
3950 ==========================
3954 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3955 [`Box`][62228], or an [array][62235] and unused.
3956 - [You can now use the `cfg` and `cfg_attr` attributes on
3957 generic parameters.][61547]
3958 - [You can now use enum variants through type alias.][61682] e.g. You can
3959 write the following:
3961 type MyOption = Option<u8>;
3963 fn increment_or_zero(x: MyOption) -> u8 {
3965 MyOption::Some(y) => y + 1,
3966 MyOption::None => 0,
3970 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3971 `const _: u32 = 5;`.
3972 - [You can now use `#[repr(align(X)]` on enums.][61229]
3973 - [The `?` Kleene macro operator is now available in the
3974 2015 edition.][60932]
3978 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3979 and `-C profile-use` flags.][61268] For more information on how to use profile
3980 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3981 - [The `rust-lldb` wrapper script should now work again.][61827]
3985 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3989 - [`BufReader::buffer`]
3990 - [`BufWriter::buffer`]
3991 - [`Cell::from_mut`]
3992 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3993 - [`DoubleEndedIterator::nth_back`]
3995 - [`Wrapping::reverse_bits`]
3996 - [`i128::reverse_bits`]
3997 - [`i16::reverse_bits`]
3998 - [`i32::reverse_bits`]
3999 - [`i64::reverse_bits`]
4000 - [`i8::reverse_bits`]
4001 - [`isize::reverse_bits`]
4002 - [`slice::copy_within`]
4003 - [`u128::reverse_bits`]
4004 - [`u16::reverse_bits`]
4005 - [`u32::reverse_bits`]
4006 - [`u64::reverse_bits`]
4007 - [`u8::reverse_bits`]
4008 - [`usize::reverse_bits`]
4012 - [`Cargo.lock` files are now included by default when publishing executable crates
4013 with executables.][cargo/7026]
4014 - [You can now specify `default-run="foo"` in `[package]` to specify the
4015 default executable to use for `cargo run`.][cargo/7056]
4022 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4023 Please transition your code to using the `..=` syntax for inclusive
4025 - [Using a trait object without the `dyn` will now warn by default.][61203]
4026 Please transition your code to use `dyn Trait` for trait objects instead.
4028 [62228]: https://github.com/rust-lang/rust/pull/62228/
4029 [62235]: https://github.com/rust-lang/rust/pull/62235/
4030 [61802]: https://github.com/rust-lang/rust/pull/61802/
4031 [61827]: https://github.com/rust-lang/rust/pull/61827/
4032 [61547]: https://github.com/rust-lang/rust/pull/61547/
4033 [61682]: https://github.com/rust-lang/rust/pull/61682/
4034 [61268]: https://github.com/rust-lang/rust/pull/61268/
4035 [61342]: https://github.com/rust-lang/rust/pull/61342/
4036 [61347]: https://github.com/rust-lang/rust/pull/61347/
4037 [61100]: https://github.com/rust-lang/rust/pull/61100/
4038 [61203]: https://github.com/rust-lang/rust/pull/61203/
4039 [61229]: https://github.com/rust-lang/rust/pull/61229/
4040 [60932]: https://github.com/rust-lang/rust/pull/60932/
4041 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4042 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4043 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4044 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4045 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4046 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4047 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4048 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4049 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4050 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4051 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4052 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4053 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4054 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4055 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4056 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4057 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4058 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4059 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4060 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4061 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4062 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4063 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4066 Version 1.36.0 (2019-07-04)
4067 ==========================
4071 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4072 - [The order of traits in trait objects no longer affects the semantics of that
4073 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4074 `dyn fmt::Debug + Send`, where this was previously not the case.
4078 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4079 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4080 - [`mem::needs_drop` is now available as a const fn.][60364]
4081 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4082 - [`String` now implements `BorrowMut<str>`.][60404]
4083 - [`io::Cursor` now implements `Default`.][60234]
4084 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4085 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4086 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4087 environment has access to heap memory allocation.
4088 - [`String` now implements `From<&String>`.][59825]
4089 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4090 return a tuple of each argument when there is multiple arguments.
4091 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4096 - [`VecDeque::rotate_left`]
4097 - [`VecDeque::rotate_right`]
4098 - [`Iterator::copied`]
4100 - [`io::IoSliceMut`]
4101 - [`Read::read_vectored`]
4102 - [`Write::write_vectored`]
4103 - [`str::as_mut_ptr`]
4104 - [`mem::MaybeUninit`]
4105 - [`pointer::align_offset`]
4106 - [`future::Future`]
4108 - [`task::RawWaker`]
4109 - [`task::RawWakerVTable`]
4115 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4116 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4118 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4122 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4129 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4130 longer recommended, and will be deprecated in 1.39.0.
4132 [60318]: https://github.com/rust-lang/rust/pull/60318/
4133 [60364]: https://github.com/rust-lang/rust/pull/60364/
4134 [60370]: https://github.com/rust-lang/rust/pull/60370/
4135 [60404]: https://github.com/rust-lang/rust/pull/60404/
4136 [60234]: https://github.com/rust-lang/rust/pull/60234/
4137 [60244]: https://github.com/rust-lang/rust/pull/60244/
4138 [58623]: https://github.com/rust-lang/rust/pull/58623/
4139 [59648]: https://github.com/rust-lang/rust/pull/59648/
4140 [59675]: https://github.com/rust-lang/rust/pull/59675/
4141 [59825]: https://github.com/rust-lang/rust/pull/59825/
4142 [59826]: https://github.com/rust-lang/rust/pull/59826/
4143 [59445]: https://github.com/rust-lang/rust/pull/59445/
4144 [59114]: https://github.com/rust-lang/rust/pull/59114/
4145 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4146 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4147 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4148 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4149 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4150 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4151 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4152 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4153 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4154 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4155 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4156 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4157 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4158 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4159 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4160 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4161 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4162 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4163 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4164 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4167 Version 1.35.0 (2019-05-23)
4168 ==========================
4172 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4173 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4174 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4176 unsafe fn call_unsafe(func: unsafe fn()) {
4181 unsafe { call_unsafe(|| {}); }
4188 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4189 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4190 - [Added the `wasm32-unknown-wasi` target.][59464]
4195 - [`Thread` will now show its ID in `Debug` output.][59460]
4196 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4197 - [`alloc::System` now implements `Default`.][59451]
4198 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4200 - [`char::{ToLowercase, ToUppercase}` now
4201 implement `ExactSizeIterator`.][58778]
4202 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4203 - [Removed the `Read` trait bounds
4204 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4205 - [You can now call the `dbg!` macro without any parameters to print the file
4206 and line where it is called.][57847]
4207 - [In place ASCII case conversions are now up to 4× faster.][59283]
4208 e.g. `str::make_ascii_lowercase`
4209 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4216 - [`RefCell::replace_with`]
4217 - [`RefCell::map_split`]
4219 - [`Range::contains`]
4220 - [`RangeFrom::contains`]
4221 - [`RangeTo::contains`]
4222 - [`RangeInclusive::contains`]
4223 - [`RangeToInclusive::contains`]
4224 - [`Option::copied`]
4228 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4229 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4234 - [The Rust toolchain is now available natively for musl based distros.][58575]
4236 [59460]: https://github.com/rust-lang/rust/pull/59460/
4237 [59464]: https://github.com/rust-lang/rust/pull/59464/
4238 [59500]: https://github.com/rust-lang/rust/pull/59500/
4239 [59512]: https://github.com/rust-lang/rust/pull/59512/
4240 [59580]: https://github.com/rust-lang/rust/pull/59580/
4241 [59283]: https://github.com/rust-lang/rust/pull/59283/
4242 [59451]: https://github.com/rust-lang/rust/pull/59451/
4243 [59076]: https://github.com/rust-lang/rust/pull/59076/
4244 [58778]: https://github.com/rust-lang/rust/pull/58778/
4245 [58717]: https://github.com/rust-lang/rust/pull/58717/
4246 [58369]: https://github.com/rust-lang/rust/pull/58369/
4247 [58423]: https://github.com/rust-lang/rust/pull/58423/
4248 [58080]: https://github.com/rust-lang/rust/pull/58080/
4249 [57847]: https://github.com/rust-lang/rust/pull/57847/
4250 [58575]: https://github.com/rust-lang/rust/pull/58575
4251 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4252 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4253 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4254 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4255 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4256 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4257 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4258 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4259 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4260 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4261 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4262 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4264 Version 1.34.2 (2019-05-14)
4265 ===========================
4267 * [Destabilize the `Error::type_id` function due to a security
4268 vulnerability][60785] ([CVE-2019-12083])
4270 [60785]: https://github.com/rust-lang/rust/pull/60785
4271 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4273 Version 1.34.1 (2019-04-25)
4274 ===========================
4276 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4277 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4278 * [Fix Clippy panic when checking some macros][clippy/3805]
4280 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4281 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4282 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4284 Version 1.34.0 (2019-04-11)
4285 ==========================
4289 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4290 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4292 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4293 `#[attr{}]` procedural macros.][57367]
4294 - [You can now write `extern crate self as foo;`][57407] to import your
4295 crate's root into the extern prelude.
4300 - [You can now target `riscv64imac-unknown-none-elf` and
4301 `riscv64gc-unknown-none-elf`.][58406]
4302 - [You can now enable linker plugin LTO optimisations with
4303 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4304 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4306 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4311 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4312 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4313 the `Hash` trait to create an iterator.
4314 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4315 methods.][58421] Most notably you no longer require the `Ord` trait to create
4317 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4318 for all numeric types.][58044]
4319 - [Indexing a `str` is now generic over all types that
4320 implement `SliceIndex<str>`.][57604]
4321 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4322 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4323 produce a warning if their returning type is unused.
4324 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4325 `overflowing_pow` are now available for all numeric types.][57873] These are
4326 equivalent to methods such as `wrapping_add` for the `pow` operation.
4334 * [`Error::type_id`]
4335 * [`atomic::AtomicI16`]
4336 * [`atomic::AtomicI32`]
4337 * [`atomic::AtomicI64`]
4338 * [`atomic::AtomicI8`]
4339 * [`atomic::AtomicU16`]
4340 * [`atomic::AtomicU32`]
4341 * [`atomic::AtomicU64`]
4342 * [`atomic::AtomicU8`]
4343 * [`convert::Infallible`]
4344 * [`convert::TryFrom`]
4345 * [`convert::TryInto`]
4347 * [`iter::successors`]
4348 * [`num::NonZeroI128`]
4349 * [`num::NonZeroI16`]
4350 * [`num::NonZeroI32`]
4351 * [`num::NonZeroI64`]
4352 * [`num::NonZeroI8`]
4353 * [`num::NonZeroIsize`]
4354 * [`slice::sort_by_cached_key`]
4355 * [`str::escape_debug`]
4356 * [`str::escape_default`]
4357 * [`str::escape_unicode`]
4358 * [`str::split_ascii_whitespace`]
4361 * [`Instant::checked_add`]
4362 * [`Instant::checked_sub`]
4363 * [`SystemTime::checked_add`]
4364 * [`SystemTime::checked_sub`]
4368 - [You can now use alternative registries to crates.io.][cargo/6654]
4372 - [You can now use the `?` operator in your documentation tests without manually
4373 adding `fn main() -> Result<(), _> {}`.][56470]
4377 - [`Command::before_exec` is being replaced by the unsafe method
4378 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4379 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4380 can now use `const` functions in `static` variables.
4382 [58370]: https://github.com/rust-lang/rust/pull/58370/
4383 [58406]: https://github.com/rust-lang/rust/pull/58406/
4384 [58421]: https://github.com/rust-lang/rust/pull/58421/
4385 [58166]: https://github.com/rust-lang/rust/pull/58166/
4386 [58044]: https://github.com/rust-lang/rust/pull/58044/
4387 [58057]: https://github.com/rust-lang/rust/pull/58057/
4388 [58059]: https://github.com/rust-lang/rust/pull/58059/
4389 [57809]: https://github.com/rust-lang/rust/pull/57809/
4390 [57873]: https://github.com/rust-lang/rust/pull/57873/
4391 [57604]: https://github.com/rust-lang/rust/pull/57604/
4392 [57367]: https://github.com/rust-lang/rust/pull/57367/
4393 [57407]: https://github.com/rust-lang/rust/pull/57407/
4394 [57425]: https://github.com/rust-lang/rust/pull/57425/
4395 [57106]: https://github.com/rust-lang/rust/pull/57106/
4396 [56470]: https://github.com/rust-lang/rust/pull/56470/
4397 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4398 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4399 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4400 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4401 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4402 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4403 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4404 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4405 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4406 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4407 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4408 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4409 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4410 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4411 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4412 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4413 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4414 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4415 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4416 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4417 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4418 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4419 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4420 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4421 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4422 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4423 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4424 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4425 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4426 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4427 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4430 Version 1.33.0 (2019-02-28)
4431 ==========================
4435 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4436 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4437 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4438 E.g. You can have match statement on a `u8` that covers `0..=255` and
4439 you would no longer be required to have a `_ => unreachable!()` case.
4440 - [You can now have multiple patterns in `if let` and `while let`
4441 expressions.][57532] You can do this with the same syntax as a `match`
4451 let state = Creature::Crab("Ferris");
4453 if let Creature::Crab(name) | Creature::Person(name) = state {
4454 println!("This creature's name is: {}", name);
4458 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4459 this feature will by default produce a warning as this behaviour can be
4460 unintuitive. E.g. `if let _ = 5 {}`
4461 - [You can now use `let` bindings, assignments, expression statements,
4462 and irrefutable pattern destructuring in const functions.][57175]
4463 - [You can now call unsafe const functions.][57067] E.g.
4465 const unsafe fn foo() -> i32 { 5 }
4466 const fn bar() -> i32 {
4470 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4471 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4472 - [You can now specify a specific alignment with the `#[repr(packed)]`
4473 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4474 with an alignment of 2 bytes and a size of 6 bytes.
4475 - [You can now import an item from a module as an `_`.][56303] This allows you to
4476 import a trait's impls, and not have the name in the namespace. E.g.
4478 use std::io::Read as _;
4480 // Allowed as there is only one `Read` in the module.
4483 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4487 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4488 command line argument.][56351]
4489 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4490 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4491 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4492 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4493 information on Rust's platform support.
4494 - [Added support for the `thumbv7neon-linux-androideabi` and
4495 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4496 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4500 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4501 functions for all numeric types.][57566]
4502 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4503 are now `const` functions for all numeric types.][57105]
4504 - [The methods `is_positive` and `is_negative` are now `const` functions for
4505 all signed numeric types.][57105]
4506 - [The `get` method for all `NonZero` types is now `const`.][57167]
4507 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4508 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4509 numeric types.][57234]
4510 - [`Ipv4Addr::new` is now a `const` function][57234]
4514 - [`unix::FileExt::read_exact_at`]
4515 - [`unix::FileExt::write_all_at`]
4516 - [`Option::transpose`]
4517 - [`Result::transpose`]
4518 - [`convert::identity`]
4521 - [`marker::PhantomPinned`]
4522 - [`Vec::resize_with`]
4523 - [`VecDeque::resize_with`]
4524 - [`Duration::as_millis`]
4525 - [`Duration::as_micros`]
4526 - [`Duration::as_nanos`]
4531 - [You can now publish crates that require a feature flag to compile with
4532 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4533 - [Cargo should now rebuild a crate if a file was modified during the initial
4538 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4539 are now deprecated in the standard library, and their usage will now produce a warning.
4540 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4542 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4544 - [Libtest no longer creates a new thread for each test when
4545 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4547 [56243]: https://github.com/rust-lang/rust/pull/56243
4548 [56303]: https://github.com/rust-lang/rust/pull/56303/
4549 [56351]: https://github.com/rust-lang/rust/pull/56351/
4550 [56362]: https://github.com/rust-lang/rust/pull/56362
4551 [56642]: https://github.com/rust-lang/rust/pull/56642/
4552 [56769]: https://github.com/rust-lang/rust/pull/56769/
4553 [56805]: https://github.com/rust-lang/rust/pull/56805
4554 [56947]: https://github.com/rust-lang/rust/pull/56947/
4555 [57049]: https://github.com/rust-lang/rust/pull/57049/
4556 [57067]: https://github.com/rust-lang/rust/pull/57067/
4557 [57105]: https://github.com/rust-lang/rust/pull/57105
4558 [57130]: https://github.com/rust-lang/rust/pull/57130/
4559 [57167]: https://github.com/rust-lang/rust/pull/57167/
4560 [57175]: https://github.com/rust-lang/rust/pull/57175/
4561 [57234]: https://github.com/rust-lang/rust/pull/57234/
4562 [57332]: https://github.com/rust-lang/rust/pull/57332/
4563 [57465]: https://github.com/rust-lang/rust/pull/57465/
4564 [57532]: https://github.com/rust-lang/rust/pull/57532/
4565 [57535]: https://github.com/rust-lang/rust/pull/57535/
4566 [57566]: https://github.com/rust-lang/rust/pull/57566/
4567 [57615]: https://github.com/rust-lang/rust/pull/57615/
4568 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4569 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4570 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4571 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4572 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4573 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4574 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4575 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4576 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4577 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4578 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4579 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4580 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4581 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4582 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4583 [platform-support]: https://forge.rust-lang.org/platform-support.html
4585 Version 1.32.0 (2019-01-17)
4586 ==========================
4591 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4592 operator allows you to specify zero or one repetitions similar to the `*` and
4594 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4595 now always resolve to the item (`enum`, `struct`, etc.) available in the
4596 module if present, before resolving to a external crate or an item the prelude.][56759]
4599 enum Color { Red, Green, Blue }
4605 - [You can now match against `PhantomData<T>` types.][55837]
4606 - [You can now match against literals in macros with the `literal`
4607 specifier.][56072] This will match against a literal of any type.
4608 E.g. `1`, `'A'`, `"Hello World"`
4609 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4611 struct Point(i32, i32);
4614 pub fn new(x: i32, y: i32) -> Self {
4618 pub fn is_origin(&self) -> bool {
4626 - [Self can also now be used in type definitions.][56366] E.g.
4630 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4633 Cons(T, Box<Self>) // likewise here
4636 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4637 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4641 - [The default allocator has changed from jemalloc to the default allocator on
4642 your system.][55238] The compiler itself on Linux & macOS will still use
4643 jemalloc, but programs compiled with it will use the system allocator.
4644 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4648 - [`PathBuf` now implements `FromStr`.][55148]
4649 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4650 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4651 easily debug expressions in your rust program. E.g.
4654 let b = dbg!(a * 2) + 1;
4655 // ^-- prints: [src/main.rs:4] a * 2 = 4
4659 The following APIs are now `const` functions and can be used in a
4663 - [`UnsafeCell::get`]
4664 - [`char::is_ascii`]
4666 - [`ManuallyDrop::new`]
4667 - [`ManuallyDrop::into_inner`]
4668 - [`RangeInclusive::start`]
4669 - [`RangeInclusive::end`]
4670 - [`NonNull::as_ptr`]
4673 - [`Duration::as_secs`]
4674 - [`Duration::subsec_millis`]
4675 - [`Duration::subsec_micros`]
4676 - [`Duration::subsec_nanos`]
4678 - [`Ipv4Addr::is_unspecified`]
4680 - [`Ipv6Addr::octets`]
4684 - [`i8::to_be_bytes`]
4685 - [`i8::to_le_bytes`]
4686 - [`i8::to_ne_bytes`]
4687 - [`i8::from_be_bytes`]
4688 - [`i8::from_le_bytes`]
4689 - [`i8::from_ne_bytes`]
4690 - [`i16::to_be_bytes`]
4691 - [`i16::to_le_bytes`]
4692 - [`i16::to_ne_bytes`]
4693 - [`i16::from_be_bytes`]
4694 - [`i16::from_le_bytes`]
4695 - [`i16::from_ne_bytes`]
4696 - [`i32::to_be_bytes`]
4697 - [`i32::to_le_bytes`]
4698 - [`i32::to_ne_bytes`]
4699 - [`i32::from_be_bytes`]
4700 - [`i32::from_le_bytes`]
4701 - [`i32::from_ne_bytes`]
4702 - [`i64::to_be_bytes`]
4703 - [`i64::to_le_bytes`]
4704 - [`i64::to_ne_bytes`]
4705 - [`i64::from_be_bytes`]
4706 - [`i64::from_le_bytes`]
4707 - [`i64::from_ne_bytes`]
4708 - [`i128::to_be_bytes`]
4709 - [`i128::to_le_bytes`]
4710 - [`i128::to_ne_bytes`]
4711 - [`i128::from_be_bytes`]
4712 - [`i128::from_le_bytes`]
4713 - [`i128::from_ne_bytes`]
4714 - [`isize::to_be_bytes`]
4715 - [`isize::to_le_bytes`]
4716 - [`isize::to_ne_bytes`]
4717 - [`isize::from_be_bytes`]
4718 - [`isize::from_le_bytes`]
4719 - [`isize::from_ne_bytes`]
4720 - [`u8::to_be_bytes`]
4721 - [`u8::to_le_bytes`]
4722 - [`u8::to_ne_bytes`]
4723 - [`u8::from_be_bytes`]
4724 - [`u8::from_le_bytes`]
4725 - [`u8::from_ne_bytes`]
4726 - [`u16::to_be_bytes`]
4727 - [`u16::to_le_bytes`]
4728 - [`u16::to_ne_bytes`]
4729 - [`u16::from_be_bytes`]
4730 - [`u16::from_le_bytes`]
4731 - [`u16::from_ne_bytes`]
4732 - [`u32::to_be_bytes`]
4733 - [`u32::to_le_bytes`]
4734 - [`u32::to_ne_bytes`]
4735 - [`u32::from_be_bytes`]
4736 - [`u32::from_le_bytes`]
4737 - [`u32::from_ne_bytes`]
4738 - [`u64::to_be_bytes`]
4739 - [`u64::to_le_bytes`]
4740 - [`u64::to_ne_bytes`]
4741 - [`u64::from_be_bytes`]
4742 - [`u64::from_le_bytes`]
4743 - [`u64::from_ne_bytes`]
4744 - [`u128::to_be_bytes`]
4745 - [`u128::to_le_bytes`]
4746 - [`u128::to_ne_bytes`]
4747 - [`u128::from_be_bytes`]
4748 - [`u128::from_le_bytes`]
4749 - [`u128::from_ne_bytes`]
4750 - [`usize::to_be_bytes`]
4751 - [`usize::to_le_bytes`]
4752 - [`usize::to_ne_bytes`]
4753 - [`usize::from_be_bytes`]
4754 - [`usize::from_le_bytes`]
4755 - [`usize::from_ne_bytes`]
4759 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4760 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4764 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4768 - [The argument types for AVX's
4769 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4770 been changed from `*const` to `*mut` as the previous implementation
4774 [55148]: https://github.com/rust-lang/rust/pull/55148/
4775 [55238]: https://github.com/rust-lang/rust/pull/55238/
4776 [55280]: https://github.com/rust-lang/rust/pull/55280/
4777 [55610]: https://github.com/rust-lang/rust/pull/55610/
4778 [55663]: https://github.com/rust-lang/rust/pull/55663/
4779 [55702]: https://github.com/rust-lang/rust/pull/55702/
4780 [55837]: https://github.com/rust-lang/rust/pull/55837/
4781 [55843]: https://github.com/rust-lang/rust/pull/55843/
4782 [56072]: https://github.com/rust-lang/rust/pull/56072/
4783 [56245]: https://github.com/rust-lang/rust/pull/56245/
4784 [56365]: https://github.com/rust-lang/rust/pull/56365/
4785 [56366]: https://github.com/rust-lang/rust/pull/56366/
4786 [56395]: https://github.com/rust-lang/rust/pull/56395/
4787 [56759]: https://github.com/rust-lang/rust/pull/56759/
4788 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4789 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4790 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4791 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4792 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4793 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4794 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4795 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4796 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4797 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4798 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4799 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4800 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4801 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4802 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4803 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4804 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4805 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4806 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4807 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4808 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4809 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4810 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4811 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4812 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4813 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4814 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4815 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4816 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4817 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4818 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4819 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4820 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4821 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4822 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4823 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4824 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4825 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4826 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4827 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4828 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4829 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4830 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4831 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4832 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4833 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4834 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4835 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4836 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4837 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4838 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4839 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4840 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4841 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4842 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4843 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4844 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4845 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4846 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4847 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4848 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4849 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4850 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4851 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4852 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4853 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4854 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4855 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4856 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4857 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4858 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4859 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4860 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4861 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4862 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4863 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4864 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4865 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4866 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4867 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4868 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4869 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4870 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4871 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4872 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4873 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4874 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4875 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4876 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4877 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4878 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4879 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4880 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4883 Version 1.31.1 (2018-12-20)
4884 ===========================
4886 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4887 - [Fix broken go-to-definition in RLS][rls/1171]
4888 - [Fix infinite loop on hover in RLS][rls/1170]
4890 [56562]: https://github.com/rust-lang/rust/pull/56562
4891 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4892 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4894 Version 1.31.0 (2018-12-06)
4895 ==========================
4899 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4900 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4901 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4902 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4904 - [You can now define and use `const` functions.][54835] These are currently
4905 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4906 [language reference][const-reference] for what exactly is available.
4907 - [You can now use tool lints, which allow you to scope lints from external
4908 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4909 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4910 a crate, not just in exported functions.][54451]
4911 - [You can now use parentheses in pattern matches.][54497]
4915 - [Updated musl to 1.1.20][54430]
4919 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4920 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4921 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4922 into `Option<&mut T>` using the `From` trait.][53218]
4923 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4928 - [`slice::align_to`]
4929 - [`slice::align_to_mut`]
4930 - [`slice::chunks_exact`]
4931 - [`slice::chunks_exact_mut`]
4932 - [`slice::rchunks`]
4933 - [`slice::rchunks_mut`]
4934 - [`slice::rchunks_exact`]
4935 - [`slice::rchunks_exact_mut`]
4936 - [`Option::replace`]
4940 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4941 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4942 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4944 [52813]: https://github.com/rust-lang/rust/pull/52813/
4945 [53218]: https://github.com/rust-lang/rust/pull/53218/
4946 [54057]: https://github.com/rust-lang/rust/pull/54057/
4947 [54240]: https://github.com/rust-lang/rust/pull/54240/
4948 [54430]: https://github.com/rust-lang/rust/pull/54430/
4949 [54451]: https://github.com/rust-lang/rust/pull/54451/
4950 [54497]: https://github.com/rust-lang/rust/pull/54497/
4951 [54778]: https://github.com/rust-lang/rust/pull/54778/
4952 [54835]: https://github.com/rust-lang/rust/pull/54835/
4953 [54870]: https://github.com/rust-lang/rust/pull/54870/
4954 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4955 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4956 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4957 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4958 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4959 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4960 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4961 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4962 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4963 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4964 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4965 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4966 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4967 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4969 Version 1.30.1 (2018-11-08)
4970 ===========================
4972 - [Fixed overflow ICE in rustdoc][54199]
4973 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4975 [54199]: https://github.com/rust-lang/rust/pull/54199
4976 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4978 Version 1.30.0 (2018-10-25)
4979 ==========================
4983 - [Procedural macros are now available.][52081] These kinds of macros allow for
4984 more powerful code generation. There is a [new chapter available][proc-macros]
4985 in the Rust Programming Language book that goes further in depth.
4986 - [You can now use keywords as identifiers using the raw identifiers
4987 syntax (`r#`),][53236] e.g. `let r#for = true;`
4988 - [Using anonymous parameters in traits is now deprecated with a warning and
4989 will be a hard error in the 2018 edition.][53272]
4990 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4991 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4992 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4993 Previously, using a external crate in a module without a use statement
4994 required `let json = ::serde_json::from_str(foo);` but can now be written
4995 as `let json = serde_json::from_str(foo);`.
4996 - [You can now apply the `#[used]` attribute to static items to prevent the
4997 compiler from optimising them away, even if they appear to be unused,][51363]
4998 e.g. `#[used] static FOO: u32 = 1;`
4999 - [You can now import and reexport macros from other crates with the `use`
5000 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5001 the root module of the crate. If your macro relies on calling other local
5002 macros, it is recommended to export with the
5003 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5005 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5006 using the `vis` specifier.][53370]
5007 - [Non-macro attributes now allow all forms of literals, not just
5008 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5009 write `#[attr(true)]`.
5010 - [You can now specify a function to handle a panic in the Rust runtime with the
5011 `#[panic_handler]` attribute.][51366]
5015 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5016 - [Added the `aarch64-unknown-netbsd` target][53165]
5017 - [Upgraded to LLVM 8.][53611]
5021 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5025 - [`Ipv4Addr::BROADCAST`]
5026 - [`Ipv4Addr::LOCALHOST`]
5027 - [`Ipv4Addr::UNSPECIFIED`]
5028 - [`Ipv6Addr::LOCALHOST`]
5029 - [`Ipv6Addr::UNSPECIFIED`]
5030 - [`Iterator::find_map`]
5032 The following methods are replacement methods for `trim_left`, `trim_right`,
5033 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5035 - [`str::trim_end_matches`]
5037 - [`str::trim_start_matches`]
5038 - [`str::trim_start`]
5042 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5043 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5044 equivalent to calling `rustdoc --error-format=json`.
5045 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5049 - [`rustdoc` allows you to specify what edition to treat your code as with the
5050 `--edition` option.][54057]
5051 - [`rustdoc` now has the `--color` (specify whether to output color) and
5052 `--error-format` (specify error format, e.g. `json`) options.][53003]
5053 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5054 debug symbols.][53774]
5055 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5056 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5058 [50911]: https://github.com/rust-lang/rust/pull/50911/
5059 [51363]: https://github.com/rust-lang/rust/pull/51363/
5060 [51366]: https://github.com/rust-lang/rust/pull/51366/
5061 [52081]: https://github.com/rust-lang/rust/pull/52081/
5062 [53003]: https://github.com/rust-lang/rust/pull/53003/
5063 [53033]: https://github.com/rust-lang/rust/pull/53033/
5064 [53044]: https://github.com/rust-lang/rust/pull/53044/
5065 [53165]: https://github.com/rust-lang/rust/pull/53165/
5066 [53611]: https://github.com/rust-lang/rust/pull/53611/
5067 [53236]: https://github.com/rust-lang/rust/pull/53236/
5068 [53272]: https://github.com/rust-lang/rust/pull/53272/
5069 [53370]: https://github.com/rust-lang/rust/pull/53370/
5070 [53459]: https://github.com/rust-lang/rust/pull/53459/
5071 [53774]: https://github.com/rust-lang/rust/pull/53774/
5072 [53822]: https://github.com/rust-lang/rust/pull/53822/
5073 [54057]: https://github.com/rust-lang/rust/pull/54057/
5074 [54404]: https://github.com/rust-lang/rust/pull/54404/
5075 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5076 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5077 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5078 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5080 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5081 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5082 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5083 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5084 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5085 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5086 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5087 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5088 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5089 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5092 Version 1.29.2 (2018-10-11)
5093 ===========================
5095 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5096 - The `rls-preview` component on the windows-gnu targets has been restored.
5098 [54639]: https://github.com/rust-lang/rust/pull/54639
5101 Version 1.29.1 (2018-09-25)
5102 ===========================
5107 - The standard library's `str::repeat` function contained an out of bounds write
5108 caused by an integer overflow. This has been fixed by deterministically
5109 panicking when an overflow happens.
5111 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5115 Version 1.29.0 (2018-09-13)
5116 ==========================
5120 - [Bumped minimum LLVM version to 5.0.][51899]
5121 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5122 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5123 - [Upgraded to LLVM 7.][51966]
5127 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5128 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5129 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5130 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5132 - [`Cell<T>` now allows `T` to be unsized.][50494]
5133 - [`SocketAddr` is now stable on Redox.][52656]
5138 - [`Iterator::flatten`]
5143 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5144 `--locked` to disable this behavior.
5145 - [`cargo-install` will now allow you to cross compile an install
5146 using `--target`.][cargo/5614]
5147 - [Added the `cargo-fix` subcommand to automatically move project code from
5148 2015 edition to 2018.][cargo/5723]
5149 - [`cargo doc` can now optionally document private types using the
5150 `--document-private-items` flag.][cargo/5543]
5154 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5155 the specified level to that level.][52354] For example `--cap-lints warn`
5156 will demote `deny` and `forbid` lints to `warn`.
5157 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5158 fails and `101` if there is a panic.][52197]
5159 - [A preview of clippy has been made available through rustup.][51122]
5160 You can install the preview with `rustup component add clippy-preview`.
5164 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5165 Use `str::get_unchecked(begin..end)` instead.
5166 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5167 Consider using the `home_dir` function from
5168 https://crates.io/crates/dirs instead.
5169 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5170 - [`cfg` attributes and `--cfg` command line flags are now more
5171 strictly validated.][53893]
5173 [53893]: https://github.com/rust-lang/rust/pull/53893/
5174 [52861]: https://github.com/rust-lang/rust/pull/52861/
5175 [51966]: https://github.com/rust-lang/rust/pull/51966/
5176 [52656]: https://github.com/rust-lang/rust/pull/52656/
5177 [52239]: https://github.com/rust-lang/rust/pull/52239/
5178 [52330]: https://github.com/rust-lang/rust/pull/52330/
5179 [52354]: https://github.com/rust-lang/rust/pull/52354/
5180 [52402]: https://github.com/rust-lang/rust/pull/52402/
5181 [52197]: https://github.com/rust-lang/rust/pull/52197/
5182 [51807]: https://github.com/rust-lang/rust/pull/51807/
5183 [51899]: https://github.com/rust-lang/rust/pull/51899/
5184 [51912]: https://github.com/rust-lang/rust/pull/51912/
5185 [51619]: https://github.com/rust-lang/rust/pull/51619/
5186 [51656]: https://github.com/rust-lang/rust/pull/51656/
5187 [51178]: https://github.com/rust-lang/rust/pull/51178/
5188 [51122]: https://github.com/rust-lang/rust/pull/51122
5189 [50494]: https://github.com/rust-lang/rust/pull/50494/
5190 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5191 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5192 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5193 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5194 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5195 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5196 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5199 Version 1.28.0 (2018-08-02)
5200 ===========================
5204 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5205 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5206 the inner type across Foreign Function Interface (FFI) boundaries.
5207 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5208 and can now be used as identifiers.][51196]
5209 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5210 stable.][51241] This will allow users to specify a global allocator for
5212 - [Unit test functions marked with the `#[test]` attribute can now return
5213 `Result<(), E: Debug>` in addition to `()`.][51298]
5214 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5215 allows macros to easily target lifetimes.
5219 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5220 prioritise making smaller binary sizes. `z` is the same as `s` with the
5221 exception that it does not vectorise loops, which typically results in an even
5223 - [The short error format is now stable.][49546] Specified with
5224 `--error-format=short` this option will provide a more compressed output of
5225 rust error messages.
5226 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5227 - [Reduced the number of allocations in the macro parser.][50855] This can
5228 improve compile times of macro heavy crates on average by 5%.
5232 - [Implemented `Default` for `&mut str`.][51306]
5233 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5234 - [Implemented `Extend` for `()`.][50234]
5235 - [The `Debug` implementation of `time::Duration` should now be more easily
5236 human readable.][50364] Previously a `Duration` of one second would printed as
5237 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5238 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5239 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5240 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5241 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5242 for `PathBuf`.][50170]
5243 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5244 and `Wrapping<i128>`.][50465]
5245 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5246 possible.][51050] This can provide up to a 40% speed increase.
5247 - [Improved error messages when using `format!`.][50610]
5251 - [`Iterator::step_by`]
5252 - [`Path::ancestors`]
5253 - [`SystemTime::UNIX_EPOCH`]
5254 - [`alloc::GlobalAlloc`]
5256 - [`alloc::LayoutErr`]
5259 - [`alloc::alloc_zeroed`]
5260 - [`alloc::dealloc`]
5261 - [`alloc::realloc`]
5262 - [`alloc::handle_alloc_error`]
5263 - [`btree_map::Entry::or_default`]
5264 - [`fmt::Alignment`]
5265 - [`hash_map::Entry::or_default`]
5266 - [`iter::repeat_with`]
5267 - [`num::NonZeroUsize`]
5268 - [`num::NonZeroU128`]
5269 - [`num::NonZeroU16`]
5270 - [`num::NonZeroU32`]
5271 - [`num::NonZeroU64`]
5272 - [`num::NonZeroU8`]
5273 - [`ops::RangeBounds`]
5274 - [`slice::SliceIndex`]
5275 - [`slice::from_mut`]
5276 - [`slice::from_ref`]
5277 - [`{Any + Send + Sync}::downcast_mut`]
5278 - [`{Any + Send + Sync}::downcast_ref`]
5279 - [`{Any + Send + Sync}::is`]
5283 - [Cargo will now no longer allow you to publish crates with build scripts that
5284 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5285 considered to be immutable.
5289 - [The `suggestion_applicability` field in `rustc`'s json output is now
5290 stable.][50486] This will allow dev tools to check whether a code suggestion
5291 would apply to them.
5295 - [Rust will consider trait objects with duplicated constraints to be the same
5296 type as without the duplicated constraint.][51276] For example the below code will
5297 now fail to compile.
5302 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5305 impl Trait + Send + Send {
5306 fn test(&self) { println!("two"); }
5310 [49546]: https://github.com/rust-lang/rust/pull/49546/
5311 [50143]: https://github.com/rust-lang/rust/pull/50143/
5312 [50170]: https://github.com/rust-lang/rust/pull/50170/
5313 [50234]: https://github.com/rust-lang/rust/pull/50234/
5314 [50265]: https://github.com/rust-lang/rust/pull/50265/
5315 [50364]: https://github.com/rust-lang/rust/pull/50364/
5316 [50385]: https://github.com/rust-lang/rust/pull/50385/
5317 [50465]: https://github.com/rust-lang/rust/pull/50465/
5318 [50486]: https://github.com/rust-lang/rust/pull/50486/
5319 [50554]: https://github.com/rust-lang/rust/pull/50554/
5320 [50610]: https://github.com/rust-lang/rust/pull/50610/
5321 [50855]: https://github.com/rust-lang/rust/pull/50855/
5322 [51050]: https://github.com/rust-lang/rust/pull/51050/
5323 [51196]: https://github.com/rust-lang/rust/pull/51196/
5324 [51241]: https://github.com/rust-lang/rust/pull/51241/
5325 [51276]: https://github.com/rust-lang/rust/pull/51276/
5326 [51298]: https://github.com/rust-lang/rust/pull/51298/
5327 [51306]: https://github.com/rust-lang/rust/pull/51306/
5328 [51562]: https://github.com/rust-lang/rust/pull/51562/
5329 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5330 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5331 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5332 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5333 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5334 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5335 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5336 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5337 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5338 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5339 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5340 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5341 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5342 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5343 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5344 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5345 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5346 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5347 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5348 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5349 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5350 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5351 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5352 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5353 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5354 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5355 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5356 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5357 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5358 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5360 Version 1.27.2 (2018-07-20)
5361 ===========================
5366 - The borrow checker was fixed to avoid potential unsoundness when using
5367 match ergonomics: [#52213][52213].
5369 [52213]: https://github.com/rust-lang/rust/issues/52213
5371 Version 1.27.1 (2018-07-10)
5372 ===========================
5377 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5378 when running, which enabled executing code as some other user on a
5379 given machine. This release fixes that vulnerability; you can read
5380 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5382 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5387 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5388 match ergonomics: [#51415][51415], [#49534][49534].
5390 [51415]: https://github.com/rust-lang/rust/issues/51415
5391 [49534]: https://github.com/rust-lang/rust/issues/49534
5392 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5393 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5395 Version 1.27.0 (2018-06-21)
5396 ==========================
5400 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5401 be used as an identifier.
5402 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5403 bare `Trait` syntax, and should make it clearer when being used in tandem with
5404 `impl Trait` because it is equivalent to the following syntax:
5405 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5406 `Box<Trait> == Box<dyn Trait>`.
5407 - [Attributes on generic parameters such as types and lifetimes are
5408 now stable.][48851] e.g.
5409 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5410 - [The `#[must_use]` attribute can now also be used on functions as well as
5411 types.][48925] It provides a lint that by default warns users when the
5412 value returned by a function has not been used.
5416 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5420 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5421 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5422 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5423 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5424 the `cfg` attribute.
5425 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5426 std are now available in core.][49896]
5427 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5429 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5430 that the operation isn't done in place.
5431 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5432 the `#[must_use]` attribute][49533] to warn about unused potentially
5433 expensive allocations.
5437 - [`DoubleEndedIterator::rfind`]
5438 - [`DoubleEndedIterator::rfold`]
5439 - [`DoubleEndedIterator::try_rfold`]
5440 - [`Duration::from_micros`]
5441 - [`Duration::from_nanos`]
5442 - [`Duration::subsec_micros`]
5443 - [`Duration::subsec_millis`]
5444 - [`HashMap::remove_entry`]
5445 - [`Iterator::try_fold`]
5446 - [`Iterator::try_for_each`]
5448 - [`Option::filter`]
5449 - [`String::replace_range`]
5450 - [`Take::set_limit`]
5451 - [`hint::unreachable_unchecked`]
5452 - [`os::unix::process::parent_id`]
5453 - [`ptr::swap_nonoverlapping`]
5454 - [`slice::rsplit_mut`]
5456 - [`slice::swap_with_slice`]
5460 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5461 `readme`, and `repository` fields.][cargo/5386]
5462 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5463 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5464 a different directory than `target` for placing compilation artifacts.
5465 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5466 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5467 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5468 where cargo would infer a binary, Cargo will produce a warning. You can
5469 disable this feature ahead of time by setting any of the following to false:
5470 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5471 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5472 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5476 - [Added “The Rustc book” into the official documentation.][49707]
5477 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5478 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5482 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5483 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5484 compile, `"".is_empty()` will still compile.
5485 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5486 will only print the inner type.][48553] E.g.
5487 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5488 not `AtomicBool(true)`.
5489 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5490 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5491 alignment should cover all use cases.
5492 - The `.description()` method on the `std::error::Error` trait
5493 [has been soft-deprecated][50163]. It is no longer required to implement it.
5495 [48553]: https://github.com/rust-lang/rust/pull/48553/
5496 [48851]: https://github.com/rust-lang/rust/pull/48851/
5497 [48925]: https://github.com/rust-lang/rust/pull/48925/
5498 [49533]: https://github.com/rust-lang/rust/pull/49533/
5499 [49623]: https://github.com/rust-lang/rust/pull/49623/
5500 [49630]: https://github.com/rust-lang/rust/pull/49630/
5501 [49664]: https://github.com/rust-lang/rust/pull/49664/
5502 [49699]: https://github.com/rust-lang/rust/pull/49699/
5503 [49707]: https://github.com/rust-lang/rust/pull/49707/
5504 [49896]: https://github.com/rust-lang/rust/pull/49896/
5505 [49968]: https://github.com/rust-lang/rust/pull/49968/
5506 [50163]: https://github.com/rust-lang/rust/pull/50163
5507 [50177]: https://github.com/rust-lang/rust/pull/50177/
5508 [50378]: https://github.com/rust-lang/rust/pull/50378/
5509 [50423]: https://github.com/rust-lang/rust/pull/50423/
5510 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5511 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5512 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5513 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5514 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5515 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5516 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5517 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5518 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5519 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5520 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5521 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5522 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5523 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5524 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5525 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5526 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5527 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5528 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5529 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5530 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5531 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5532 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5533 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5534 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5535 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5536 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5537 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5538 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5541 Version 1.26.2 (2018-06-05)
5542 ==========================
5547 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5549 [51117]: https://github.com/rust-lang/rust/issues/51117
5552 Version 1.26.1 (2018-05-29)
5553 ==========================
5558 - [RLS now works on Windows.][50646]
5559 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5565 - [`fn main() -> impl Trait` no longer works for non-Termination
5567 This reverts an accidental stabilization.
5568 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5569 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5571 [50646]: https://github.com/rust-lang/rust/issues/50646
5572 [50656]: https://github.com/rust-lang/rust/pull/50656
5573 [50812]: https://github.com/rust-lang/rust/pull/50812
5574 [50950]: https://github.com/rust-lang/rust/issues/50950
5575 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5577 Version 1.26.0 (2018-05-10)
5578 ==========================
5582 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5583 implement either or both traits.][49299]
5584 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5585 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5586 lifetime can be elided.][49458]
5587 - [`impl Trait` is now stable allowing you to have abstract types in returns
5588 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5589 `fn open(path: impl AsRef<Path>)`.
5590 - [Pattern matching will now automatically apply dereferences.][49394]
5591 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5592 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5593 - [A lot of operations are now available in a const context.][46882] E.g. You
5594 can now index into constant arrays, reference and dereference into constants,
5595 and use tuple struct constructors.
5596 - [Fixed entry slice patterns are now stable.][48516] E.g.
5598 let points = [1, 2, 3, 4];
5600 [1, 2, 3, 4] => println!("All points were sequential."),
5601 _ => println!("Not all points were sequential."),
5608 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5609 - [Fixed exponential projection complexity on nested types.][48296]
5610 This can provide up to a ~12% reduction in compile times for certain crates.
5611 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5612 to remap path prefixes outputted by the compiler.
5613 - [Added `powerpc-unknown-netbsd` target.][48281]
5617 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5618 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5619 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5620 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5621 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5622 - [`ascii::escape_default` is now available in libcore.][48735]
5623 - [Trailing commas are now supported in std and core macros.][48056]
5624 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5625 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5630 - [`*const T::copy_to_nonoverlapping`]
5631 - [`*const T::copy_to`]
5632 - [`*const T::read_unaligned`]
5633 - [`*const T::read_volatile`]
5634 - [`*const T::read`]
5636 - [`*const T::wrapping_add`]
5637 - [`*const T::wrapping_sub`]
5639 - [`*mut T::copy_to_nonoverlapping`]
5640 - [`*mut T::copy_to`]
5641 - [`*mut T::read_unaligned`]
5642 - [`*mut T::read_volatile`]
5644 - [`*mut T::replace`]
5647 - [`*mut T::wrapping_add`]
5648 - [`*mut T::wrapping_sub`]
5649 - [`*mut T::write_bytes`]
5650 - [`*mut T::write_unaligned`]
5651 - [`*mut T::write_volatile`]
5654 - [`FromUtf8Error::as_bytes`]
5655 - [`LocalKey::try_with`]
5656 - [`Option::cloned`]
5657 - [`btree_map::Entry::and_modify`]
5658 - [`fs::read_to_string`]
5661 - [`hash_map::Entry::and_modify`]
5662 - [`iter::FusedIterator`]
5663 - [`ops::RangeInclusive`]
5664 - [`ops::RangeToInclusive`]
5666 - [`slice::rotate_left`]
5667 - [`slice::rotate_right`]
5668 - [`String::retain`]
5673 - [Cargo will now output path to custom commands when `-v` is
5674 passed with `--list`][cargo/5041]
5675 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5679 - [The second edition of "The Rust Programming Language" book is now recommended
5680 over the first.][48404]
5685 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5686 syntax is now invalid.
5688 use std::ops::Fn as dyn;
5689 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5691 - [The result of dereferences are no longer promoted to `'static`.][47408]
5695 const PAIR: &(i32, i32) = &(0, 1);
5696 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5699 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5700 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5702 - [Removed hoedown from rustdoc.][48274]
5703 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5705 [46882]: https://github.com/rust-lang/rust/pull/46882
5706 [47379]: https://github.com/rust-lang/rust/pull/47379
5707 [47408]: https://github.com/rust-lang/rust/pull/47408
5708 [47813]: https://github.com/rust-lang/rust/pull/47813
5709 [48056]: https://github.com/rust-lang/rust/pull/48056
5710 [48125]: https://github.com/rust-lang/rust/pull/48125
5711 [48235]: https://github.com/rust-lang/rust/pull/48235
5712 [48274]: https://github.com/rust-lang/rust/pull/48274
5713 [48281]: https://github.com/rust-lang/rust/pull/48281
5714 [48296]: https://github.com/rust-lang/rust/pull/48296
5715 [48326]: https://github.com/rust-lang/rust/pull/48326
5716 [48359]: https://github.com/rust-lang/rust/pull/48359
5717 [48404]: https://github.com/rust-lang/rust/pull/48404
5718 [48481]: https://github.com/rust-lang/rust/pull/48481
5719 [48516]: https://github.com/rust-lang/rust/pull/48516
5720 [48628]: https://github.com/rust-lang/rust/pull/48628
5721 [48629]: https://github.com/rust-lang/rust/pull/48629
5722 [48657]: https://github.com/rust-lang/rust/pull/48657
5723 [48735]: https://github.com/rust-lang/rust/pull/48735
5724 [48978]: https://github.com/rust-lang/rust/pull/48978
5725 [49101]: https://github.com/rust-lang/rust/pull/49101
5726 [49109]: https://github.com/rust-lang/rust/pull/49109
5727 [49162]: https://github.com/rust-lang/rust/pull/49162
5728 [49255]: https://github.com/rust-lang/rust/pull/49255
5729 [49299]: https://github.com/rust-lang/rust/pull/49299
5730 [49305]: https://github.com/rust-lang/rust/pull/49305
5731 [49394]: https://github.com/rust-lang/rust/pull/49394
5732 [49458]: https://github.com/rust-lang/rust/pull/49458
5733 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5734 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5735 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5736 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5737 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5738 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5739 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5740 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5741 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5742 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5743 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5744 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5745 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5746 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5747 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5748 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5749 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5750 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5751 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5752 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5753 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5754 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5755 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5756 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5757 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5758 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5759 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5760 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5761 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5762 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5763 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5764 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5765 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5766 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5767 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5768 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5769 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5770 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5771 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5772 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5773 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5774 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5777 Version 1.25.0 (2018-03-29)
5778 ==========================
5782 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5783 - [You can now use nested groups of imports.][47948]
5784 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5785 - [You can now have `|` at the start of a match arm.][47947] e.g.
5787 enum Foo { A, B, C }
5793 | Foo::B => println!("AB"),
5794 | Foo::C => println!("C"),
5801 - [Upgraded to LLVM 6.][47828]
5802 - [Added `-C lto=val` option.][47521]
5803 - [Added `i586-unknown-linux-musl` target][47282]
5807 - [Impl Send for `process::Command` on Unix.][47760]
5808 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5809 - [`UnsafeCell::into_inner` is now safe.][47204]
5810 - [Implement libstd for CloudABI.][47268]
5811 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5812 - [Implement `AsRef<Path>` for Component][46985]
5813 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5814 - [Moved `Duration` to libcore.][46666]
5818 - [`Location::column`]
5821 The following functions can now be used in a constant expression.
5822 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5823 - [`Duration::new`][47300]
5824 - [`Duration::from_secs`][47300]
5825 - [`Duration::from_millis`][47300]
5829 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5830 - [`cargo new` now defaults to creating a binary crate, instead of a
5831 library crate.][cargo/5029]
5835 - [Rust by example is now shipped with new releases][46196]
5839 - [Deprecated `net::lookup_host`.][47510]
5840 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5841 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5842 around indexing operations (see [#47349][47349]). This has been fixed (which also
5843 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5844 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5846 [33903]: https://github.com/rust-lang/rust/pull/33903
5847 [47947]: https://github.com/rust-lang/rust/pull/47947
5848 [47948]: https://github.com/rust-lang/rust/pull/47948
5849 [47760]: https://github.com/rust-lang/rust/pull/47760
5850 [47790]: https://github.com/rust-lang/rust/pull/47790
5851 [47828]: https://github.com/rust-lang/rust/pull/47828
5852 [47398]: https://github.com/rust-lang/rust/pull/47398
5853 [47510]: https://github.com/rust-lang/rust/pull/47510
5854 [47521]: https://github.com/rust-lang/rust/pull/47521
5855 [47204]: https://github.com/rust-lang/rust/pull/47204
5856 [47251]: https://github.com/rust-lang/rust/pull/47251
5857 [47268]: https://github.com/rust-lang/rust/pull/47268
5858 [47282]: https://github.com/rust-lang/rust/pull/47282
5859 [47300]: https://github.com/rust-lang/rust/pull/47300
5860 [47349]: https://github.com/rust-lang/rust/pull/47349
5861 [46931]: https://github.com/rust-lang/rust/pull/46931
5862 [46985]: https://github.com/rust-lang/rust/pull/46985
5863 [47006]: https://github.com/rust-lang/rust/pull/47006
5864 [46830]: https://github.com/rust-lang/rust/pull/46830
5865 [46095]: https://github.com/rust-lang/rust/pull/46095
5866 [46666]: https://github.com/rust-lang/rust/pull/46666
5867 [46196]: https://github.com/rust-lang/rust/pull/46196
5868 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5869 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5870 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5871 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5872 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5875 Version 1.24.1 (2018-03-01)
5876 ==========================
5878 - [Do not abort when unwinding through FFI][48251]
5879 - [Emit UTF-16 files for linker arguments on Windows][48318]
5880 - [Make the error index generator work again][48308]
5881 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5883 [48251]: https://github.com/rust-lang/rust/issues/48251
5884 [48308]: https://github.com/rust-lang/rust/issues/48308
5885 [48318]: https://github.com/rust-lang/rust/issues/48318
5886 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5889 Version 1.24.0 (2018-02-15)
5890 ==========================
5894 - [External `sysv64` ffi is now available.][46528]
5895 eg. `extern "sysv64" fn foo () {}`
5899 - [rustc now uses 16 codegen units by default for release builds.][46910]
5900 For the fastest builds, utilize `codegen-units=1`.
5901 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5902 - [Add `aarch64-unknown-openbsd` support][46760]
5906 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5907 improvement in performance in the majority of cases.
5908 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5909 with Windows.][46798]
5910 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5911 - [impl `From<bool>` for `AtomicBool`][46293]
5912 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5913 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5914 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5915 - [float::from_bits now just uses transmute.][46012] This provides
5916 some optimisations from LLVM.
5917 - [Copied `AsciiExt` methods onto `char`][46077]
5918 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5919 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5920 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5921 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5925 - [`RefCell::replace`]
5927 - [`atomic::spin_loop_hint`]
5929 The following functions can now be used in a constant expression.
5930 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5932 - [`AtomicBool::new`][46287]
5933 - [`AtomicUsize::new`][46287]
5934 - [`AtomicIsize::new`][46287]
5935 - [`AtomicPtr::new`][46287]
5936 - [`Cell::new`][46287]
5937 - [`{integer}::min_value`][46287]
5938 - [`{integer}::max_value`][46287]
5939 - [`mem::size_of`][46287]
5940 - [`mem::align_of`][46287]
5941 - [`ptr::null`][46287]
5942 - [`ptr::null_mut`][46287]
5943 - [`RefCell::new`][46287]
5944 - [`UnsafeCell::new`][46287]
5948 - [Added a `workspace.default-members` config that
5949 overrides implied `--all` in virtual workspaces.][cargo/4743]
5950 - [Enable incremental by default on development builds.][cargo/4817] Also added
5951 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5952 per-project or global basis respectively.
5959 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5960 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5961 in accordance with IETF RFC 4291 §2.2.
5962 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5963 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5964 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5965 - [Leading zeros in tuple struct members is now an error][47084]
5966 - [`column!()` macro is one-based instead of zero-based][46977]
5967 - [`fmt::Arguments` can no longer be shared across threads][45198]
5968 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5969 - [Cargo sets a different working directory for the compiler][cargo/4788]
5971 [44884]: https://github.com/rust-lang/rust/pull/44884
5972 [45198]: https://github.com/rust-lang/rust/pull/45198
5973 [45506]: https://github.com/rust-lang/rust/pull/45506
5974 [45990]: https://github.com/rust-lang/rust/pull/45990
5975 [46012]: https://github.com/rust-lang/rust/pull/46012
5976 [46077]: https://github.com/rust-lang/rust/pull/46077
5977 [46094]: https://github.com/rust-lang/rust/pull/46094
5978 [46284]: https://github.com/rust-lang/rust/pull/46284
5979 [46287]: https://github.com/rust-lang/rust/pull/46287
5980 [46293]: https://github.com/rust-lang/rust/pull/46293
5981 [46528]: https://github.com/rust-lang/rust/pull/46528
5982 [46671]: https://github.com/rust-lang/rust/pull/46671
5983 [46713]: https://github.com/rust-lang/rust/pull/46713
5984 [46735]: https://github.com/rust-lang/rust/pull/46735
5985 [46760]: https://github.com/rust-lang/rust/pull/46760
5986 [46798]: https://github.com/rust-lang/rust/pull/46798
5987 [46828]: https://github.com/rust-lang/rust/pull/46828
5988 [46831]: https://github.com/rust-lang/rust/pull/46831
5989 [46833]: https://github.com/rust-lang/rust/pull/46833
5990 [46910]: https://github.com/rust-lang/rust/pull/46910
5991 [46977]: https://github.com/rust-lang/rust/pull/46977
5992 [47018]: https://github.com/rust-lang/rust/pull/47018
5993 [47080]: https://github.com/rust-lang/rust/pull/47080
5994 [47084]: https://github.com/rust-lang/rust/pull/47084
5995 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5996 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5997 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5998 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5999 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6000 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6003 Version 1.23.0 (2018-01-04)
6004 ==========================
6008 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6009 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6010 Which should fix some confusing errors in some operations.
6014 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6015 undefined behavior.][45920]
6016 - [rustc now suggests renaming import if names clash.][45660]
6017 - [Display errors/warnings correctly when there are zero-width or
6018 wide characters.][45711]
6019 - [rustc now avoids unnecessary copies of arguments that are
6020 simple bindings][45380] This should improve memory usage on average by 5-10%.
6021 - [Updated musl used to build musl rustc to 1.1.17][45393]
6025 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6026 - [Implement Hash for raw pointers to unsized types][45483]
6027 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6028 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6029 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6030 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6031 and `<*mut T>::as_mut`][44932]
6032 - [Optimized `Thread::{park, unpark}` implementation][45524]
6033 - [Improved `SliceExt::binary_search` performance.][45333]
6034 - [impl `FromIterator<()>` for `()`][45379]
6035 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6043 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6044 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6045 - [Added unit test checking to `cargo check`][cargo/4592]
6046 - [Cargo now lets you install a specific version
6047 using `cargo install --version`][cargo/4637]
6051 - [Releases now ship with the Cargo book documentation.][45692]
6052 - [rustdoc now prints rendering warnings on every run.][45324]
6056 - [Changes have been made to type equality to make it more correct,
6057 in rare cases this could break some code.][45853] [Tracking issue for
6058 further information][45852]
6059 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6060 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6061 Android 9, the minimum supported version is Android 14.
6062 - [Bumped the minimum LLVM to 3.9][45326]
6064 [44042]: https://github.com/rust-lang/rust/pull/44042
6065 [44932]: https://github.com/rust-lang/rust/pull/44932
6066 [45267]: https://github.com/rust-lang/rust/pull/45267
6067 [45324]: https://github.com/rust-lang/rust/pull/45324
6068 [45326]: https://github.com/rust-lang/rust/pull/45326
6069 [45333]: https://github.com/rust-lang/rust/pull/45333
6070 [45379]: https://github.com/rust-lang/rust/pull/45379
6071 [45380]: https://github.com/rust-lang/rust/pull/45380
6072 [45393]: https://github.com/rust-lang/rust/pull/45393
6073 [45435]: https://github.com/rust-lang/rust/pull/45435
6074 [45483]: https://github.com/rust-lang/rust/pull/45483
6075 [45524]: https://github.com/rust-lang/rust/pull/45524
6076 [45571]: https://github.com/rust-lang/rust/pull/45571
6077 [45580]: https://github.com/rust-lang/rust/pull/45580
6078 [45610]: https://github.com/rust-lang/rust/pull/45610
6079 [45660]: https://github.com/rust-lang/rust/pull/45660
6080 [45692]: https://github.com/rust-lang/rust/pull/45692
6081 [45711]: https://github.com/rust-lang/rust/pull/45711
6082 [45772]: https://github.com/rust-lang/rust/pull/45772
6083 [45852]: https://github.com/rust-lang/rust/issues/45852
6084 [45853]: https://github.com/rust-lang/rust/pull/45853
6085 [45887]: https://github.com/rust-lang/rust/pull/45887
6086 [45920]: https://github.com/rust-lang/rust/pull/45920
6087 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6088 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6089 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6092 Version 1.22.1 (2017-11-22)
6093 ==========================
6095 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6097 [46183]: https://github.com/rust-lang/rust/pull/46183
6099 Version 1.22.0 (2017-11-22)
6100 ==========================
6104 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6105 - [Now accepts underscores in unicode escapes][43716]
6106 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6107 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6111 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6112 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6113 This should decrease compile times for debug builds.
6114 - [strict memory alignment now enabled on ARMv6][45094]
6115 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6119 - [Allow atomic operations up to 32 bits
6120 on `armv5te_unknown_linux_gnueabi`][44978]
6121 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6122 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6123 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6124 - [Properly detect overflow in `Instant += Duration`.][44220]
6125 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6126 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6127 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6134 - [Cargo will now build multi file examples in subdirectories of the `examples`
6135 folder that have a `main.rs` file.][cargo/4496]
6136 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6137 the old format will continue to work and can be updated with `cargo update`.
6138 - [Now supports vendoring git repositories][cargo/3992]
6142 - [`libbacktrace` is now available on Apple platforms.][44251]
6143 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6144 This now lets you specify that a given code example will fail to compile.
6148 - [The minimum Android version that rustc can build for has been bumped
6149 to `4.0` from `2.3`][45656]
6150 - [Allowing `T op= &T` for numeric types has broken some type
6151 inference cases][45480]
6154 [42526]: https://github.com/rust-lang/rust/pull/42526
6155 [43716]: https://github.com/rust-lang/rust/pull/43716
6156 [43949]: https://github.com/rust-lang/rust/pull/43949
6157 [44015]: https://github.com/rust-lang/rust/pull/44015
6158 [44220]: https://github.com/rust-lang/rust/pull/44220
6159 [44251]: https://github.com/rust-lang/rust/pull/44251
6160 [44287]: https://github.com/rust-lang/rust/pull/44287
6161 [44303]: https://github.com/rust-lang/rust/pull/44303
6162 [44456]: https://github.com/rust-lang/rust/pull/44456
6163 [44466]: https://github.com/rust-lang/rust/pull/44466
6164 [44895]: https://github.com/rust-lang/rust/pull/44895
6165 [44966]: https://github.com/rust-lang/rust/pull/44966
6166 [44978]: https://github.com/rust-lang/rust/pull/44978
6167 [45041]: https://github.com/rust-lang/rust/pull/45041
6168 [45064]: https://github.com/rust-lang/rust/pull/45064
6169 [45075]: https://github.com/rust-lang/rust/pull/45075
6170 [45094]: https://github.com/rust-lang/rust/pull/45094
6171 [45095]: https://github.com/rust-lang/rust/pull/45095
6172 [45480]: https://github.com/rust-lang/rust/issues/45480
6173 [45656]: https://github.com/rust-lang/rust/pull/45656
6174 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6175 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6176 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6183 Version 1.21.0 (2017-10-12)
6184 ==========================
6188 - [You can now use static references for literals.][43838]
6192 let x: &'static u32 = &0;
6195 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6198 my_macro!(Vec<i32>::new); // Always worked
6199 my_macro!(Vec::<i32>::new); // Now works
6204 - [Upgraded jemalloc to 4.5.0][43911]
6205 - [Enabled unwinding panics on Redox][43917]
6206 - [Now runs LLVM in parallel during translation phase.][43506]
6207 This should reduce peak memory usage.
6211 - [Generate builtin impls for `Clone` for all arrays and tuples that
6212 are `T: Clone`][43690]
6213 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6214 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6215 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6220 [`std::mem::discriminant`]
6224 - [You can now call `cargo install` with multiple package names][cargo/4216]
6225 - [Cargo commands inside a virtual workspace will now implicitly
6226 pass `--all`][cargo/4335]
6227 - [Added a `[patch]` section to `Cargo.toml` to handle
6228 prepublication dependencies][cargo/4123] [RFC 1969]
6229 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6230 like patterns][cargo/4270]
6231 - [Added the `--all-targets` option][cargo/4400]
6232 - [Using required dependencies as a feature is now deprecated and emits
6233 a warning][cargo/4364]
6238 - [Cargo docs are moving][43916]
6239 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6240 - [The rustdoc book is now available][43863]
6241 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6242 - [Added a preview of RLS has been made available through rustup][44204]
6243 Install with `rustup component add rls-preview`
6244 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6245 Previously only showed `std::os::unix`.
6249 - [Changes in method matching against higher-ranked types][43880] This may cause
6250 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6251 - [rustc's JSON error output's byte position start at top of file.][42973]
6252 Was previously relative to the rustc's internal `CodeMap` struct which
6253 required the unstable library `libsyntax` to correctly use.
6254 - [`unused_results` lint no longer ignores booleans][43728]
6256 [42565]: https://github.com/rust-lang/rust/pull/42565
6257 [42973]: https://github.com/rust-lang/rust/pull/42973
6258 [43348]: https://github.com/rust-lang/rust/pull/43348
6259 [43459]: https://github.com/rust-lang/rust/pull/43459
6260 [43506]: https://github.com/rust-lang/rust/pull/43506
6261 [43540]: https://github.com/rust-lang/rust/pull/43540
6262 [43690]: https://github.com/rust-lang/rust/pull/43690
6263 [43728]: https://github.com/rust-lang/rust/pull/43728
6264 [43838]: https://github.com/rust-lang/rust/pull/43838
6265 [43863]: https://github.com/rust-lang/rust/pull/43863
6266 [43880]: https://github.com/rust-lang/rust/pull/43880
6267 [43911]: https://github.com/rust-lang/rust/pull/43911
6268 [43916]: https://github.com/rust-lang/rust/pull/43916
6269 [43917]: https://github.com/rust-lang/rust/pull/43917
6270 [44204]: https://github.com/rust-lang/rust/pull/44204
6271 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6272 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6273 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6274 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6275 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6276 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6277 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6278 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6279 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6281 Version 1.20.0 (2017-08-31)
6282 ===========================
6286 - [Associated constants are now stabilised.][42809]
6287 - [A lot of macro bugs are now fixed.][42913]
6292 - [Struct fields are now properly coerced to the expected field type.][42807]
6293 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6294 `wasm32-experimental-emscripten` target.
6295 - [Changed some of the error messages to be more helpful.][42033]
6296 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6298 - [rustc now reports the total number of errors on compilation failure][43015]
6299 previously this was only the number of errors in the pass that failed.
6300 - [Expansion in rustc has been sped up 29x.][42533]
6301 - [added `msp430-none-elf` target.][43099]
6302 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6304 - [Fixes backtraces on Redox][43228]
6305 - [rustc now identifies different versions of same crate when absolute paths of
6306 different types match in an error message.][42826]
6312 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6313 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6315 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6316 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6317 - [Impl `Clone` for `DefaultHasher`.][42799]
6318 - [Impl `Sync` for `SyncSender`.][42397]
6319 - [Impl `FromStr` for `char`][42271]
6320 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6322 - [allow messages in the `unimplemented!()` macro.][42155]
6323 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6324 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6325 - [Upgrade to Unicode 10.0.0][42999]
6326 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6327 - [Skip the main thread's manual stack guard on Linux][43072]
6328 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6329 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6331 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6336 - [`CStr::into_c_string`]
6337 - [`CString::as_c_str`]
6338 - [`CString::into_boxed_c_str`]
6339 - [`Chain::get_mut`]
6340 - [`Chain::get_ref`]
6341 - [`Chain::into_inner`]
6342 - [`Option::get_or_insert_with`]
6343 - [`Option::get_or_insert`]
6344 - [`OsStr::into_os_string`]
6345 - [`OsString::into_boxed_os_str`]
6348 - [`Utf8Error::error_len`]
6349 - [`char::EscapeDebug`]
6350 - [`char::escape_debug`]
6351 - [`compile_error!`]
6352 - [`f32::from_bits`]
6354 - [`f64::from_bits`]
6356 - [`mem::ManuallyDrop`]
6357 - [`slice::sort_unstable_by_key`]
6358 - [`slice::sort_unstable_by`]
6359 - [`slice::sort_unstable`]
6360 - [`str::from_boxed_utf8_unchecked`]
6361 - [`str::as_bytes_mut`]
6362 - [`str::as_bytes_mut`]
6363 - [`str::from_utf8_mut`]
6364 - [`str::from_utf8_unchecked_mut`]
6366 - [`str::get_unchecked_mut`]
6367 - [`str::get_unchecked`]
6369 - [`str::into_boxed_bytes`]
6374 - [Cargo API token location moved from `~/.cargo/config` to
6375 `~/.cargo/credentials`.][cargo/3978]
6376 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6377 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6378 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6379 - [You can now specify version of a binary when installed through
6380 `cargo install` using `--vers`.][cargo/4229]
6381 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6382 failure.][cargo/4248]
6383 - [Changed the convention around which file is the crate root.][cargo/4259]
6388 - [Functions with `'static` in their return types will now not be as usable as
6389 if they were using lifetime parameters instead.][42417]
6390 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6391 takes the sign of NaN into account where previously didn't.][42430]
6393 [42033]: https://github.com/rust-lang/rust/pull/42033
6394 [42155]: https://github.com/rust-lang/rust/pull/42155
6395 [42271]: https://github.com/rust-lang/rust/pull/42271
6396 [42397]: https://github.com/rust-lang/rust/pull/42397
6397 [42417]: https://github.com/rust-lang/rust/pull/42417
6398 [42430]: https://github.com/rust-lang/rust/pull/42430
6399 [42431]: https://github.com/rust-lang/rust/pull/42431
6400 [42533]: https://github.com/rust-lang/rust/pull/42533
6401 [42571]: https://github.com/rust-lang/rust/pull/42571
6402 [42613]: https://github.com/rust-lang/rust/pull/42613
6403 [42799]: https://github.com/rust-lang/rust/pull/42799
6404 [42807]: https://github.com/rust-lang/rust/pull/42807
6405 [42809]: https://github.com/rust-lang/rust/pull/42809
6406 [42822]: https://github.com/rust-lang/rust/pull/42822
6407 [42826]: https://github.com/rust-lang/rust/pull/42826
6408 [42854]: https://github.com/rust-lang/rust/pull/42854
6409 [42913]: https://github.com/rust-lang/rust/pull/42913
6410 [42999]: https://github.com/rust-lang/rust/pull/42999
6411 [43011]: https://github.com/rust-lang/rust/pull/43011
6412 [43015]: https://github.com/rust-lang/rust/pull/43015
6413 [43072]: https://github.com/rust-lang/rust/pull/43072
6414 [43077]: https://github.com/rust-lang/rust/pull/43077
6415 [43097]: https://github.com/rust-lang/rust/pull/43097
6416 [43099]: https://github.com/rust-lang/rust/pull/43099
6417 [43170]: https://github.com/rust-lang/rust/pull/43170
6418 [43178]: https://github.com/rust-lang/rust/pull/43178
6419 [43185]: https://github.com/rust-lang/rust/pull/43185
6420 [43228]: https://github.com/rust-lang/rust/pull/43228
6421 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6422 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6423 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6424 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6425 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6426 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6427 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6428 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6429 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6430 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6431 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6432 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6433 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6434 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6435 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6436 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6437 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6438 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6439 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6440 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6441 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6442 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6443 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6444 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6445 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6446 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6447 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6448 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6449 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6450 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6451 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6452 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6453 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6454 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6455 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6456 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6457 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6458 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6461 Version 1.19.0 (2017-07-20)
6462 ===========================
6467 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6468 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6469 - [Macro recursion limit increased to 1024 from 64.][41676]
6470 - [Added lint for detecting unused macros.][41907]
6471 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6472 For example: `let x = loop { break 7; };`
6473 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6474 contain `Copy` types and cannot have a `Drop` implementation.
6475 Example: `union Foo { bar: u8, baz: usize }`
6476 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6477 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6482 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6483 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6484 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6485 you should use `--target armv7-linux-androideabi`.
6486 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6487 - [Minor optimisation of string operations.][42037]
6488 - [Compiler error message is now `aborting due to previous error(s)` instead of
6489 `aborting due to N previous errors`][42150] This was previously inaccurate and
6490 would only count certain kinds of errors.
6491 - [The compiler now supports Visual Studio 2017][42225]
6492 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6493 - [Added a lot][42264] of [new error codes][42302]
6494 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6495 libraries with C Run-time Libraries(CRT) to be statically linked.
6496 - [Fixed various ARM codegen bugs][42740]
6501 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6502 `Extend<Cow<'a, str>>`][41449]
6503 - [`Vec` now implements `From<&mut [T]>`][41530]
6504 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6505 - [`SplitWhitespace` now implements `Clone`][41659]
6506 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6508 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6509 macros, but for printing to stderr.
6514 - [`OsString::shrink_to_fit`]
6517 - [`thread::ThreadId`]
6522 - [Build scripts can now add environment variables to the environment
6523 the crate is being compiled in.
6524 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6525 - [Subcommands now replace the current process rather than spawning a new
6526 child process][cargo/3970]
6527 - [Workspace members can now accept glob file patterns][cargo/3979]
6528 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6529 the members in a given workspace.][cargo/3988]
6530 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6531 - [Target directory path is now in the cargo metadata][cargo/4022]
6532 - [Cargo no longer checks out a local working directory for the
6533 crates.io index][cargo/4026] This should provide smaller file size for the
6534 registry, and improve cloning times, especially on Windows machines.
6535 - [Added an `--exclude` option for excluding certain packages when using the
6536 `--all` option][cargo/4031]
6537 - [Cargo will now automatically retry when receiving a 5xx error
6538 from crates.io][cargo/4032]
6539 - [The `--features` option now accepts multiple comma or space
6540 delimited values.][cargo/4084]
6541 - [Added support for custom target specific runners][cargo/3954]
6546 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6548 - [Rust will now release XZ compressed packages][rust-installer/57]
6549 - [rustup will now prefer to download rust packages with
6550 XZ compression][rustup/1100] over GZip packages.
6551 - [Added the ability to escape `#` in rust documentation][41785] By adding
6552 additional `#`'s ie. `##` is now `#`
6557 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6558 - [`-Z` flags are now no longer allowed to be used on the stable
6559 compiler.][41751] This has been a warning for a year previous to this.
6560 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6561 longer works][42844]. Users should migrate to the built-in `check`
6562 command, which has been available since 1.16.
6563 - [Ending a float literal with `._` is now a hard error.
6564 Example: `42._` .][41946]
6565 - [Any use of a private `extern crate` outside of its module is now a
6566 hard error.][36886] This was previously a warning.
6567 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6568 relative while the `::` prefix makes a path absolute, but was ignored and the
6569 path was relative regardless.
6570 - [Floating point constants in match patterns is now a hard error][36890]
6571 This was previously a warning.
6572 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6573 match patterns is now a hard error][36891] This was previously a warning.
6574 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6576 - [From the pound escape, lines consisting of multiple `#`s are
6578 - [It is an error to re-export private enum variants][42460]. This is
6579 known to break a number of crates that depend on an older version of
6581 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6582 to use it to find the linker, and the build will fail where it did
6583 not previously][42607]
6585 [36886]: https://github.com/rust-lang/rust/issues/36886
6586 [36888]: https://github.com/rust-lang/rust/issues/36888
6587 [36890]: https://github.com/rust-lang/rust/issues/36890
6588 [36891]: https://github.com/rust-lang/rust/issues/36891
6589 [36892]: https://github.com/rust-lang/rust/issues/36892
6590 [37406]: https://github.com/rust-lang/rust/issues/37406
6591 [39983]: https://github.com/rust-lang/rust/pull/39983
6592 [41145]: https://github.com/rust-lang/rust/pull/41145
6593 [41192]: https://github.com/rust-lang/rust/pull/41192
6594 [41258]: https://github.com/rust-lang/rust/pull/41258
6595 [41370]: https://github.com/rust-lang/rust/pull/41370
6596 [41449]: https://github.com/rust-lang/rust/pull/41449
6597 [41530]: https://github.com/rust-lang/rust/pull/41530
6598 [41624]: https://github.com/rust-lang/rust/pull/41624
6599 [41656]: https://github.com/rust-lang/rust/pull/41656
6600 [41659]: https://github.com/rust-lang/rust/pull/41659
6601 [41676]: https://github.com/rust-lang/rust/pull/41676
6602 [41751]: https://github.com/rust-lang/rust/pull/41751
6603 [41764]: https://github.com/rust-lang/rust/pull/41764
6604 [41785]: https://github.com/rust-lang/rust/pull/41785
6605 [41873]: https://github.com/rust-lang/rust/pull/41873
6606 [41907]: https://github.com/rust-lang/rust/pull/41907
6607 [41946]: https://github.com/rust-lang/rust/pull/41946
6608 [42016]: https://github.com/rust-lang/rust/pull/42016
6609 [42037]: https://github.com/rust-lang/rust/pull/42037
6610 [42068]: https://github.com/rust-lang/rust/pull/42068
6611 [42150]: https://github.com/rust-lang/rust/pull/42150
6612 [42162]: https://github.com/rust-lang/rust/pull/42162
6613 [42225]: https://github.com/rust-lang/rust/pull/42225
6614 [42264]: https://github.com/rust-lang/rust/pull/42264
6615 [42302]: https://github.com/rust-lang/rust/pull/42302
6616 [42460]: https://github.com/rust-lang/rust/issues/42460
6617 [42607]: https://github.com/rust-lang/rust/issues/42607
6618 [42740]: https://github.com/rust-lang/rust/pull/42740
6619 [42844]: https://github.com/rust-lang/rust/issues/42844
6620 [42948]: https://github.com/rust-lang/rust/pull/42948
6621 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6622 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6623 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6624 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6625 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6626 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6627 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6628 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6629 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6630 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6631 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6632 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6633 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6634 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6635 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6636 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6637 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6638 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6639 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6640 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6641 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6642 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6645 Version 1.18.0 (2017-06-08)
6646 ===========================
6651 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6652 make the item visible to just that module tree. Also accepts the keyword
6653 `crate` to make something public to the whole crate but not users of the
6654 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6655 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6656 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6657 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6658 types like `Write + Send`, trailing `+` are now supported in trait objects,
6659 and better error reporting for trait objects starting with `?Sized`.
6660 - [0e+10 is now a valid floating point literal][40589]
6661 - [Now warns if you bind a lifetime parameter to 'static][40734]
6662 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6663 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6664 representation in some cases.][40377]
6669 - [rustc can now emit mir with `--emit mir`][39891]
6670 - [Improved LLVM IR for trivial functions][40367]
6671 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6672 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6673 opportunities found through profiling
6674 - [Improved backtrace formatting when panicking][38165]
6679 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6680 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6681 iteration or reallocation.
6682 - [Simplified HashMap Bucket interface][40561] provides performance
6683 improvements for iterating and cloning.
6684 - [Specialize Vec::from_elem to use calloc][40409]
6685 - [Fixed Race condition in fs::create_dir_all][39799]
6686 - [No longer caching stdio on Windows][40516]
6687 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6688 2.50%~ faster and in one case now 12.50% faster.
6689 - [Optimized `AtomicBool::fetch_nand`][41143]
6694 - [`Child::try_wait`]
6695 - [`HashMap::retain`]
6696 - [`HashSet::retain`]
6698 - [`TcpStream::peek`]
6699 - [`UdpSocket::peek`]
6700 - [`UdpSocket::peek_from`]
6705 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6706 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6707 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6708 - [Added Android build support][cargo/3885]
6709 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6710 of a certain type, for example `cargo build --bins` will build all
6712 - [Added support for haiku][cargo/3952]
6717 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6718 - [Rust now uses the official cross compiler for NetBSD][40612]
6719 - [rustdoc now accepts `#` at the start of files][40828]
6720 - [Fixed jemalloc support for musl][41168]
6725 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6726 always placed after the sign if it exists and before the digits. With the `#`
6727 flag the zeroes are placed after the prefix and before the digits.
6728 - [Due to the struct field optimisation][40377], using `transmute` on structs
6729 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6730 always been undefined behavior, but is now more likely to break in practice.
6731 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6732 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6733 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6734 - [Overlapping inherent `impl`s are now a hard error][40728]
6735 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6736 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6737 `out.asm` and `out.ll` instead of only one of the filetypes.
6738 - [ calling a function that returns `Self` will no longer work][41805] when
6739 the size of `Self` cannot be statically determined.
6740 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6741 this has caused a few regressions namely:
6743 - Changed the link order of local static/dynamic libraries (respecting the
6744 order on given rather than having the compiler reorder).
6745 - Changed how MinGW is linked, native code linked to dynamic libraries
6746 may require manually linking to the gcc support library (for the native
6749 [38165]: https://github.com/rust-lang/rust/pull/38165
6750 [39799]: https://github.com/rust-lang/rust/pull/39799
6751 [39891]: https://github.com/rust-lang/rust/pull/39891
6752 [40043]: https://github.com/rust-lang/rust/pull/40043
6753 [40241]: https://github.com/rust-lang/rust/pull/40241
6754 [40338]: https://github.com/rust-lang/rust/pull/40338
6755 [40367]: https://github.com/rust-lang/rust/pull/40367
6756 [40377]: https://github.com/rust-lang/rust/pull/40377
6757 [40409]: https://github.com/rust-lang/rust/pull/40409
6758 [40516]: https://github.com/rust-lang/rust/pull/40516
6759 [40556]: https://github.com/rust-lang/rust/pull/40556
6760 [40561]: https://github.com/rust-lang/rust/pull/40561
6761 [40589]: https://github.com/rust-lang/rust/pull/40589
6762 [40612]: https://github.com/rust-lang/rust/pull/40612
6763 [40723]: https://github.com/rust-lang/rust/pull/40723
6764 [40728]: https://github.com/rust-lang/rust/pull/40728
6765 [40731]: https://github.com/rust-lang/rust/pull/40731
6766 [40734]: https://github.com/rust-lang/rust/pull/40734
6767 [40805]: https://github.com/rust-lang/rust/pull/40805
6768 [40807]: https://github.com/rust-lang/rust/pull/40807
6769 [40828]: https://github.com/rust-lang/rust/pull/40828
6770 [40870]: https://github.com/rust-lang/rust/pull/40870
6771 [41085]: https://github.com/rust-lang/rust/pull/41085
6772 [41143]: https://github.com/rust-lang/rust/pull/41143
6773 [41168]: https://github.com/rust-lang/rust/pull/41168
6774 [41270]: https://github.com/rust-lang/rust/issues/41270
6775 [41469]: https://github.com/rust-lang/rust/pull/41469
6776 [41805]: https://github.com/rust-lang/rust/issues/41805
6777 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6778 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6779 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6780 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6781 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6782 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6783 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6784 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6785 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6786 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6787 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6788 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6789 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6790 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6793 Version 1.17.0 (2017-04-27)
6794 ===========================
6799 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6800 * [Fields of structs may be initialized without duplicating the field/variable
6801 names][39761]. [RFC 1682]
6802 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6803 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6804 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6805 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6806 `'b`. Soundness fix.
6807 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6808 * [Static variables may contain references to other statics][40027]
6813 * [Exit quickly on only `--emit dep-info`][40336]
6814 * [Make `-C relocation-model` more correctly determine whether the linker
6815 creates a position-independent executable][40245]
6816 * [Add `-C overflow-checks` to directly control whether integer overflow
6818 * [The rustc type checker now checks items on demand instead of in a single
6819 in-order pass][40008]. This is mostly an internal refactoring in support of
6820 future work, including incremental type checking, but also resolves [RFC
6821 1647], allowing `Self` to appear in `impl` `where` clauses.
6822 * [Optimize vtable loads][39995]
6823 * [Turn off vectorization for Emscripten targets][39990]
6824 * [Provide suggestions for unknown macros imported with `use`][39953]
6825 * [Fix ICEs in path resolution][39939]
6826 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6827 * [Add clearer error message using `&str + &str`][39116]
6838 * [`Ordering::then`]
6839 * [`Ordering::then_with`]
6840 * [`BTreeMap::range`]
6841 * [`BTreeMap::range_mut`]
6842 * [`collections::Bound`]
6843 * [`process::abort`]
6844 * [`ptr::read_unaligned`]
6845 * [`ptr::write_unaligned`]
6846 * [`Result::expect_err`]
6849 * [`Cell::into_inner`]
6855 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6856 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6857 * [`String` implements `FromIterator<&char>`][40028]
6858 * `Box` [implements][40009] a number of new conversions:
6859 `From<Box<str>> for String`,
6860 `From<Box<[T]>> for Vec<T>`,
6861 `From<Box<CStr>> for CString`,
6862 `From<Box<OsStr>> for OsString`,
6863 `From<Box<Path>> for PathBuf`,
6864 `Into<Box<str>> for String`,
6865 `Into<Box<[T]>> for Vec<T>`,
6866 `Into<Box<CStr>> for CString`,
6867 `Into<Box<OsStr>> for OsString`,
6868 `Into<Box<Path>> for PathBuf`,
6869 `Default for Box<str>`,
6870 `Default for Box<CStr>`,
6871 `Default for Box<OsStr>`,
6872 `From<&CStr> for Box<CStr>`,
6873 `From<&OsStr> for Box<OsStr>`,
6874 `From<&Path> for Box<Path>`
6875 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6876 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6877 * [Slightly optimize `slice::sort`][39538]
6878 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6879 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6880 `Box<str>` implements `From<&str>`][39438]
6881 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6882 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6883 * [`format!` estimates the needed capacity before writing a string][39356]
6884 * [Support unprivileged symlink creation in Windows][38921]
6885 * [`PathBuf` implements `Default`][38764]
6886 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6887 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6888 and poor hash functions.
6893 * [Add `cargo check --all`][cargo/3731]
6894 * [Add an option to ignore SSL revocation checking][cargo/3699]
6895 * [Add `cargo run --package`][cargo/3691]
6896 * [Add `required_features`][cargo/3667]
6897 * [Assume `build.rs` is a build script][cargo/3664]
6898 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6903 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6905 * [The "Unstable Book" documents nightly-only features][ubook]
6906 * [Improve the style of the sidebar in rustdoc output][40265]
6907 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6908 * [Fix MSP430 breakage due to `i128`][40257]
6909 * [Preliminary Solaris/SPARCv9 support][39903]
6910 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6911 run without installing the MSVC runtime.
6912 * [`rustdoc --test` includes file names in test names][39788]
6913 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6914 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6915 * [Initial support for `aarch64-unknown-freebsd`][39491]
6916 * [Initial support for `i686-unknown-netbsd`][39426]
6917 * [This release no longer includes the old makefile build system][39431]. Rust
6918 is built with a custom build system, written in Rust, and with Cargo.
6919 * [Add Debug implementations for libcollection structs][39002]
6920 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6921 * [`--test-threads=0` produces an error][38945]
6922 * [`rustup` installs documentation by default][40526]
6923 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6924 WinDbg and Visual Studio to improve the debugging experience.
6929 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6930 workaround, either use MSVC 2015 or run vcvars.bat.
6931 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6932 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6933 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6935 * [`format!` and `Display::to_string` panic if an underlying formatting
6936 implementation returns an error][40117]. Previously the error was silently
6937 ignored. It is incorrect for `write_fmt` to return an error when writing
6939 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6940 crates were marked stable and could be accessed from the stable toolchain.
6941 * [Rust git source no longer includes vendored crates][39728]. Those that need
6942 to build with vendored crates should build from release tarballs.
6943 * [Fix inert attributes from `proc_macro_derives`][39572]
6944 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6945 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6947 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6948 existing code generally ignores the type of dead-code unless a type-hint is
6949 provided; this can cause surprising inference interactions particularly around
6950 defaulting. The new code uniformly ignores the result type of dead-code.
6951 * [Tuple-struct constructors with private fields are no longer visible][38932]
6952 * [Lifetime parameters that do not appear in the arguments are now considered
6953 early-bound][38897], resolving a soundness bug (#[32330]). The
6954 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6956 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6957 * [Make transmuting from fn item types to pointer-sized types a hard
6960 [27787]: https://github.com/rust-lang/rust/issues/27787
6961 [32330]: https://github.com/rust-lang/rust/issues/32330
6962 [34198]: https://github.com/rust-lang/rust/pull/34198
6963 [38161]: https://github.com/rust-lang/rust/pull/38161
6964 [38368]: https://github.com/rust-lang/rust/pull/38368
6965 [38584]: https://github.com/rust-lang/rust/issues/38584
6966 [38661]: https://github.com/rust-lang/rust/pull/38661
6967 [38764]: https://github.com/rust-lang/rust/pull/38764
6968 [38864]: https://github.com/rust-lang/rust/issues/38864
6969 [38897]: https://github.com/rust-lang/rust/pull/38897
6970 [38921]: https://github.com/rust-lang/rust/pull/38921
6971 [38932]: https://github.com/rust-lang/rust/pull/38932
6972 [38945]: https://github.com/rust-lang/rust/pull/38945
6973 [38981]: https://github.com/rust-lang/rust/pull/38981
6974 [39002]: https://github.com/rust-lang/rust/pull/39002
6975 [39116]: https://github.com/rust-lang/rust/pull/39116
6976 [39193]: https://github.com/rust-lang/rust/pull/39193
6977 [39265]: https://github.com/rust-lang/rust/pull/39265
6978 [39356]: https://github.com/rust-lang/rust/pull/39356
6979 [39372]: https://github.com/rust-lang/rust/pull/39372
6980 [39426]: https://github.com/rust-lang/rust/pull/39426
6981 [39431]: https://github.com/rust-lang/rust/pull/39431
6982 [39438]: https://github.com/rust-lang/rust/pull/39438
6983 [39440]: https://github.com/rust-lang/rust/pull/39440
6984 [39485]: https://github.com/rust-lang/rust/pull/39485
6985 [39491]: https://github.com/rust-lang/rust/pull/39491
6986 [39518]: https://github.com/rust-lang/rust/pull/39518
6987 [39538]: https://github.com/rust-lang/rust/pull/39538
6988 [39572]: https://github.com/rust-lang/rust/pull/39572
6989 [39633]: https://github.com/rust-lang/rust/pull/39633
6990 [39642]: https://github.com/rust-lang/rust/pull/39642
6991 [39728]: https://github.com/rust-lang/rust/pull/39728
6992 [39761]: https://github.com/rust-lang/rust/pull/39761
6993 [39788]: https://github.com/rust-lang/rust/pull/39788
6994 [39793]: https://github.com/rust-lang/rust/pull/39793
6995 [39837]: https://github.com/rust-lang/rust/pull/39837
6996 [39843]: https://github.com/rust-lang/rust/pull/39843
6997 [39851]: https://github.com/rust-lang/rust/pull/39851
6998 [39903]: https://github.com/rust-lang/rust/pull/39903
6999 [39939]: https://github.com/rust-lang/rust/pull/39939
7000 [39953]: https://github.com/rust-lang/rust/pull/39953
7001 [39960]: https://github.com/rust-lang/rust/pull/39960
7002 [39990]: https://github.com/rust-lang/rust/pull/39990
7003 [39995]: https://github.com/rust-lang/rust/pull/39995
7004 [40008]: https://github.com/rust-lang/rust/pull/40008
7005 [40009]: https://github.com/rust-lang/rust/pull/40009
7006 [40027]: https://github.com/rust-lang/rust/pull/40027
7007 [40028]: https://github.com/rust-lang/rust/pull/40028
7008 [40037]: https://github.com/rust-lang/rust/pull/40037
7009 [40117]: https://github.com/rust-lang/rust/pull/40117
7010 [40166]: https://github.com/rust-lang/rust/pull/40166
7011 [40245]: https://github.com/rust-lang/rust/pull/40245
7012 [40257]: https://github.com/rust-lang/rust/pull/40257
7013 [40261]: https://github.com/rust-lang/rust/pull/40261
7014 [40265]: https://github.com/rust-lang/rust/pull/40265
7015 [40319]: https://github.com/rust-lang/rust/pull/40319
7016 [40336]: https://github.com/rust-lang/rust/pull/40336
7017 [40526]: https://github.com/rust-lang/rust/pull/40526
7018 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7019 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7020 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7021 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7022 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7023 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7024 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7025 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7026 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7027 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7028 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7029 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7030 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7031 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7032 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7033 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7034 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7035 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7036 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7037 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7038 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7039 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7040 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7041 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7042 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7043 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7044 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7045 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7046 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7047 [ubook]: https://doc.rust-lang.org/unstable-book/
7050 Version 1.16.0 (2017-03-16)
7051 ===========================
7056 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7057 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7058 match patterns][38069]
7059 * [Clean up semantics of `self` in an import list][38313]
7060 * [`Self` may appear in `impl` headers][38920]
7061 * [`Self` may appear in struct expressions][39282]
7066 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7067 a `.rmeta` file containing only crate metadata][38571]. This can be
7068 used by tools like the Rust Language Service to perform
7069 metadata-only builds.
7070 * [Levenshtein based typo suggestions now work in most places, while
7071 previously they worked only for fields and sometimes for local
7072 variables][38927]. Together with the overhaul of "no
7073 resolution"/"unexpected resolution" errors (#[38154]) they result in
7074 large and systematic improvement in resolution diagnostics.
7075 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7077 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7078 * [`rustc` no longer attempts to provide "consider using an explicit
7079 lifetime" suggestions][37057]. They were inaccurate.
7084 * [`VecDeque::truncate`]
7085 * [`VecDeque::resize`]
7086 * [`String::insert_str`]
7087 * [`Duration::checked_add`]
7088 * [`Duration::checked_sub`]
7089 * [`Duration::checked_div`]
7090 * [`Duration::checked_mul`]
7093 * [`SocketAddr::is_ipv4`]
7094 * [`SocketAddr::is_ipv6`]
7095 * [`IpAddr::is_ipv4`]
7096 * [`IpAddr::is_ipv6`]
7098 * [`Vec::dedup_by_key`]
7099 * [`Result::unwrap_or_default`]
7100 * [`<*const T>::wrapping_offset`]
7101 * [`<*mut T>::wrapping_offset`]
7102 * `CommandExt::creation_flags`
7103 * [`File::set_permissions`]
7104 * [`String::split_off`]
7109 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7110 their argument by `Borrow` parameter][37761]
7111 * [All public types in std implement `Debug`][38006]
7112 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7113 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7114 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7116 * [std: Fix partial writes in `LineWriter`][38062]
7117 * [std: Clamp max read/write sizes on Unix][38622]
7118 * [Use more specific panic message for `&str` slicing errors][38066]
7119 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7120 functionality cannot be achieved in std currently.
7121 * [`writeln!`, like `println!`, now accepts a form with no string
7122 or formatting arguments, to just print a newline][38469]
7123 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7124 * [Reduce the size of static data in `std_unicode::tables`][38781]
7125 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7126 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7128 * [`Duration` implements `Sum`][38712]
7129 * [`String` implements `ToSocketAddrs`][39048]
7134 * [The `cargo check` command does a type check of a project without
7135 building it][cargo/3296]
7136 * [crates.io will display CI badges from Travis and AppVeyor, if
7137 specified in Cargo.toml][cargo/3546]
7138 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7139 * [Compilation profiles accept integer values for `debug`, in addition
7140 to `true` and `false`. These are passed to `rustc` as the value to
7141 `-C debuginfo`][cargo/3534]
7142 * [Implement `cargo --version --verbose`][cargo/3604]
7143 * [All builds now output 'dep-info' build dependencies compatible with
7144 make and ninja][cargo/3557]
7145 * [Build all workspace members with `build --all`][cargo/3511]
7146 * [Document all workspace members with `doc --all`][cargo/3515]
7147 * [Path deps outside workspace are not members][cargo/3443]
7152 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7153 the path to the Rust implementation][38589]
7154 * [The `armv7-linux-androideabi` target no longer enables NEON
7155 extensions, per Google's ABI guide][38413]
7156 * [The stock standard library can be compiled for Redox OS][38401]
7157 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7159 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7161 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7166 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7167 match patterns][38069]
7168 * In this release, references to uninhabited types can not be
7169 pattern-matched. This was accidentally allowed in 1.15.
7170 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7171 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7173 * [Clean up semantics of `self` in an import list][38313]
7174 * Reimplemented lifetime elision. This change was almost entirely compatible
7175 with existing code, but it did close a number of small bugs and loopholes,
7176 as well as being more accepting in some other [cases][41105].
7178 [37057]: https://github.com/rust-lang/rust/pull/37057
7179 [37761]: https://github.com/rust-lang/rust/pull/37761
7180 [38006]: https://github.com/rust-lang/rust/pull/38006
7181 [38051]: https://github.com/rust-lang/rust/pull/38051
7182 [38062]: https://github.com/rust-lang/rust/pull/38062
7183 [38622]: https://github.com/rust-lang/rust/pull/38622
7184 [38066]: https://github.com/rust-lang/rust/pull/38066
7185 [38069]: https://github.com/rust-lang/rust/pull/38069
7186 [38131]: https://github.com/rust-lang/rust/pull/38131
7187 [38154]: https://github.com/rust-lang/rust/pull/38154
7188 [38274]: https://github.com/rust-lang/rust/pull/38274
7189 [38304]: https://github.com/rust-lang/rust/pull/38304
7190 [38313]: https://github.com/rust-lang/rust/pull/38313
7191 [38327]: https://github.com/rust-lang/rust/pull/38327
7192 [38401]: https://github.com/rust-lang/rust/pull/38401
7193 [38413]: https://github.com/rust-lang/rust/pull/38413
7194 [38469]: https://github.com/rust-lang/rust/pull/38469
7195 [38559]: https://github.com/rust-lang/rust/pull/38559
7196 [38571]: https://github.com/rust-lang/rust/pull/38571
7197 [38580]: https://github.com/rust-lang/rust/pull/38580
7198 [38589]: https://github.com/rust-lang/rust/pull/38589
7199 [38670]: https://github.com/rust-lang/rust/pull/38670
7200 [38712]: https://github.com/rust-lang/rust/pull/38712
7201 [38726]: https://github.com/rust-lang/rust/pull/38726
7202 [38781]: https://github.com/rust-lang/rust/pull/38781
7203 [38798]: https://github.com/rust-lang/rust/pull/38798
7204 [38909]: https://github.com/rust-lang/rust/pull/38909
7205 [38920]: https://github.com/rust-lang/rust/pull/38920
7206 [38927]: https://github.com/rust-lang/rust/pull/38927
7207 [39048]: https://github.com/rust-lang/rust/pull/39048
7208 [39282]: https://github.com/rust-lang/rust/pull/39282
7209 [39379]: https://github.com/rust-lang/rust/pull/39379
7210 [41105]: https://github.com/rust-lang/rust/issues/41105
7211 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7212 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7213 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7214 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7215 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7216 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7217 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7218 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7219 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7220 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7221 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7222 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7223 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7224 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7225 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7226 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7227 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7228 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7229 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7230 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7231 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7232 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7233 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7234 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7235 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7236 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7237 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7238 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7239 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7242 Version 1.15.1 (2017-02-09)
7243 ===========================
7245 * [Fix IntoIter::as_mut_slice's signature][39466]
7246 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7248 [39466]: https://github.com/rust-lang/rust/pull/39466
7249 [39523]: https://github.com/rust-lang/rust/pull/39523
7252 Version 1.15.0 (2017-02-02)
7253 ===========================
7258 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7259 stable. This allows popular code-generating crates like Serde and Diesel to
7260 work ergonomically. [RFC 1681].
7261 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7262 with curly braces][36868]. Part of [RFC 1506].
7263 * [A number of minor changes to name resolution have been activated][37127].
7264 They add up to more consistent semantics, allowing for future evolution of
7265 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7266 details of what is different. The breaking changes here have been transitioned
7267 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7268 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7270 * [`?Sized` can be used in `where` clauses][37791]
7271 * [There is now a limit on the size of monomorphized types and it can be
7272 modified with the `#![type_size_limit]` crate attribute, similarly to
7273 the `#![recursion_limit]` attribute][37789]
7278 * [On Windows, the compiler will apply dllimport attributes when linking to
7279 extern functions][37973]. Additional attributes and flags can control which
7280 library kind is linked and its name. [RFC 1717].
7281 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7282 * [The `--test` flag works with procedural macro crates][38107]
7283 * [Fix `extern "aapcs" fn` ABI][37814]
7284 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7285 * [The `format!` expander recognizes incorrect `printf` and shell-style
7286 formatting directives and suggests the correct format][37613].
7287 * [Only report one error for all unused imports in an import list][37456]
7289 Compiler Performance
7290 --------------------
7292 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7293 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7294 * [Don't clone in `UnificationTable::probe`][37848]
7295 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7296 * [Use small vectors in type walker][37760]
7297 * [Macro expansion performance was improved][37701]
7298 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7299 * [Replace FNV with a faster hash function][37229]
7304 * [`std::iter::Iterator::min_by`]
7305 * [`std::iter::Iterator::max_by`]
7306 * [`std::os::*::fs::FileExt`]
7307 * [`std::sync::atomic::Atomic*::get_mut`]
7308 * [`std::sync::atomic::Atomic*::into_inner`]
7309 * [`std::vec::IntoIter::as_slice`]
7310 * [`std::vec::IntoIter::as_mut_slice`]
7311 * [`std::sync::mpsc::Receiver::try_iter`]
7312 * [`std::os::unix::process::CommandExt::before_exec`]
7313 * [`std::rc::Rc::strong_count`]
7314 * [`std::rc::Rc::weak_count`]
7315 * [`std::sync::Arc::strong_count`]
7316 * [`std::sync::Arc::weak_count`]
7317 * [`std::char::encode_utf8`]
7318 * [`std::char::encode_utf16`]
7319 * [`std::cell::Ref::clone`]
7320 * [`std::io::Take::into_inner`]
7325 * [The standard sorting algorithm has been rewritten for dramatic performance
7326 improvements][38192]. It is a hybrid merge sort, drawing influences from
7327 Timsort. Previously it was a naive merge sort.
7328 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7329 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7331 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7332 and `char_indices().last()`][37882]
7333 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7334 * [Chinese characters display correctly in `fmt::Debug`][37855]
7335 * [Derive `Default` for `Duration`][37699]
7336 * [Support creation of anonymous pipes on WinXP/2k][37677]
7337 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7338 * [Don't pass overlapped handles to processes][38835]
7343 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7344 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7345 should instead check the variable at runtime with `std::env`. That the value
7346 was set at build time was a bug, and incorrect when cross-compiling. This
7347 change is known to cause breakage.
7348 * [Add `--all` flag to `cargo test`][cargo/3221]
7349 * [Compile statically against the MSVC CRT][cargo/3363]
7350 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7351 * [Link OpenSSL statically on OSX][cargo/3311]
7352 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7353 * [Test for bad path overrides with summaries][cargo/3336]
7354 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7355 * [Fix retrying crate downloads for network errors][cargo/3348]
7356 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7357 * [Emit more info on --message-format=json][cargo/3319]
7358 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7359 * [Don't ignore errors in workspace manifest][cargo/3409]
7360 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7365 * [Test runners (binaries built with `--test`) now support a `--list` argument
7366 that lists the tests it contains][38185]
7367 * [Test runners now support a `--exact` argument that makes the test filter
7368 match exactly, instead of matching only a substring of the test name][38181]
7369 * [rustdoc supports a `--playground-url` flag][37763]
7370 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7375 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7376 continue to be used in this release by passing `--disable-rustbuild` to the
7377 configure script, but they will be deleted soon. Note that the new build
7378 system uses a different on-disk layout that will likely affect any scripts
7380 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7382 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7383 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7389 * [A number of minor changes to name resolution have been activated][37127].
7390 They add up to more consistent semantics, allowing for future evolution of
7391 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7392 details of what is different. The breaking changes here have been transitioned
7393 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7394 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7395 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7396 should instead check the variable at runtime with `std::env`. That the value
7397 was set at build time was a bug, and incorrect when cross-compiling. This
7398 change is known to cause breakage.
7399 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7400 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7401 1.10 and is now an error by default. It will become a hard error in the near
7403 * [The semantics relating modules to file system directories are changing in
7404 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7405 lint, which is a warning in this release, and will become a hard error in the
7407 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7408 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7409 the underlying iterator][37834]
7411 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7412 [33685]: https://github.com/rust-lang/rust/issues/33685
7413 [36868]: https://github.com/rust-lang/rust/pull/36868
7414 [37127]: https://github.com/rust-lang/rust/pull/37127
7415 [37229]: https://github.com/rust-lang/rust/pull/37229
7416 [37456]: https://github.com/rust-lang/rust/pull/37456
7417 [37527]: https://github.com/rust-lang/rust/pull/37527
7418 [37602]: https://github.com/rust-lang/rust/pull/37602
7419 [37613]: https://github.com/rust-lang/rust/pull/37613
7420 [37615]: https://github.com/rust-lang/rust/pull/37615
7421 [37636]: https://github.com/rust-lang/rust/pull/37636
7422 [37627]: https://github.com/rust-lang/rust/pull/37627
7423 [37642]: https://github.com/rust-lang/rust/pull/37642
7424 [37677]: https://github.com/rust-lang/rust/pull/37677
7425 [37699]: https://github.com/rust-lang/rust/pull/37699
7426 [37701]: https://github.com/rust-lang/rust/pull/37701
7427 [37705]: https://github.com/rust-lang/rust/pull/37705
7428 [37749]: https://github.com/rust-lang/rust/pull/37749
7429 [37760]: https://github.com/rust-lang/rust/pull/37760
7430 [37763]: https://github.com/rust-lang/rust/pull/37763
7431 [37764]: https://github.com/rust-lang/rust/pull/37764
7432 [37789]: https://github.com/rust-lang/rust/pull/37789
7433 [37791]: https://github.com/rust-lang/rust/pull/37791
7434 [37814]: https://github.com/rust-lang/rust/pull/37814
7435 [37817]: https://github.com/rust-lang/rust/pull/37817
7436 [37834]: https://github.com/rust-lang/rust/pull/37834
7437 [37848]: https://github.com/rust-lang/rust/pull/37848
7438 [37855]: https://github.com/rust-lang/rust/pull/37855
7439 [37882]: https://github.com/rust-lang/rust/pull/37882
7440 [37888]: https://github.com/rust-lang/rust/pull/37888
7441 [37973]: https://github.com/rust-lang/rust/pull/37973
7442 [37979]: https://github.com/rust-lang/rust/pull/37979
7443 [38086]: https://github.com/rust-lang/rust/pull/38086
7444 [38107]: https://github.com/rust-lang/rust/pull/38107
7445 [38117]: https://github.com/rust-lang/rust/pull/38117
7446 [38134]: https://github.com/rust-lang/rust/pull/38134
7447 [38146]: https://github.com/rust-lang/rust/pull/38146
7448 [38181]: https://github.com/rust-lang/rust/pull/38181
7449 [38182]: https://github.com/rust-lang/rust/pull/38182
7450 [38185]: https://github.com/rust-lang/rust/pull/38185
7451 [38192]: https://github.com/rust-lang/rust/pull/38192
7452 [38279]: https://github.com/rust-lang/rust/pull/38279
7453 [38835]: https://github.com/rust-lang/rust/pull/38835
7454 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7455 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7456 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7457 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7458 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7459 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7460 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7461 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7462 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7463 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7464 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7465 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7466 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7467 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7468 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7469 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7470 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7471 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7472 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7473 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7474 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7475 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7476 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7477 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7478 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7479 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7480 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7481 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7482 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7483 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7484 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7485 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7486 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7487 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7488 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7489 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7490 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7493 Version 1.14.0 (2016-12-22)
7494 ===========================
7499 * [`..` matches multiple tuple fields in enum variants, structs
7500 and tuples][36843]. [RFC 1492].
7501 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7502 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7503 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7504 dereferencing][36822]
7509 * [Mark enums with non-zero discriminant as non-zero][37224]
7510 * [Lower-case `static mut` names are linted like other
7511 statics and consts][37162]
7512 * [Fix ICE on some macros in const integer positions
7513 (e.g. `[u8; m!()]`)][36819]
7514 * [Improve error message and snippet for "did you mean `x`"][36798]
7515 * [Add a panic-strategy field to the target specification][36794]
7516 * [Include LLVM version in `--version --verbose`][37200]
7518 Compile-time Optimizations
7519 --------------------------
7521 * [Improve macro expansion performance][37569]
7522 * [Shrink `Expr_::ExprInlineAsm`][37445]
7523 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7524 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7525 * [Avoid more allocations when compiling html5ever][37373]
7526 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7527 * [Avoid some allocations in the macro parser][37318]
7528 * [Use a faster deflate setting][37298]
7529 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7530 during interning of slices][37270]
7531 * [Optimize `write_metadata`][37267]
7532 * [Don't process obligation forest cycles when stalled][37231]
7533 * [Avoid many `CrateConfig` clones][37161]
7534 * [Optimize `Substs::super_fold_with`][37108]
7535 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7536 * [Speed up `plug_leaks`][36917]
7541 * [`println!()`, with no arguments, prints newline][36825].
7542 Previously, an empty string was required to achieve the same.
7543 * [`Wrapping` impls standard binary and unary operators, as well as
7544 the `Sum` and `Product` iterators][37356]
7545 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7547 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7548 `VecDeque` iterators][37315]
7549 * [Improve `SipHasher` performance on small values][37312]
7550 * [Add Iterator trait TrustedLen to enable better FromIterator /
7552 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7553 * [`ReadDir` implements `Debug`][37221]
7554 * [Implement `RefUnwindSafe` for atomic types][37178]
7555 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7556 * [Avoid allocations in `Decoder::read_str`][37064]
7557 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7558 * [Impl `Debug` for raw pointers to unsized data][36880]
7559 * [Don't reuse `HashMap` random seeds][37470]
7560 * [The internal memory layout of `HashMap` is more cache-friendly, for
7561 significant improvements in some operations][36692]
7562 * [`HashMap` uses less memory on 32-bit architectures][36595]
7563 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7568 * [Expose rustc cfg values to build scripts][cargo/3243]
7569 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7570 * [Fix passing --features when testing multiple packages][cargo/3280]
7571 * [Use a single profile set per workspace][cargo/3249]
7572 * [Load `replace` sections from lock files][cargo/3220]
7573 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7578 * [rustup is the recommended Rust installation method][1.14rustup]
7579 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7580 S390x. These are [tier 2] platforms and may have major defects. Follow the
7581 instructions on the website to install, or add the targets to an existing
7582 installation with `rustup target add`. The new target triples are:
7583 - `mips-unknown-linux-gnu`
7584 - `mipsel-unknown-linux-gnu`
7585 - `mips64-unknown-linux-gnuabi64`
7586 - `mips64el-unknown-linux-gnuabi64 `
7587 - `powerpc-unknown-linux-gnu`
7588 - `powerpc64-unknown-linux-gnu`
7589 - `powerpc64le-unknown-linux-gnu`
7590 - `s390x-unknown-linux-gnu `
7591 * This release includes target (std) builds for ARM Linux running MUSL
7592 libc. These are [tier 2] platforms and may have major defects. Add the
7593 following triples to an existing rustup installation with `rustup target add`:
7594 - `arm-unknown-linux-musleabi`
7595 - `arm-unknown-linux-musleabihf`
7596 - `armv7-unknown-linux-musleabihf`
7597 * This release includes [experimental support for WebAssembly][1.14wasm], via
7598 the `wasm32-unknown-emscripten` target. This target is known to have major
7599 defects. Please test, report, and fix.
7600 * rustup no longer installs documentation by default. Run `rustup
7601 component add rust-docs` to install.
7602 * [Fix line stepping in debugger][37310]
7603 * [Enable line number debuginfo in releases][37280]
7608 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7609 * [Add support for Fuchsia OS][37313]
7610 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7615 * [A number of forward-compatibility lints used by the compiler
7616 to gradually introduce language changes have been converted
7617 to deny by default][36894]:
7618 - ["use of inaccessible extern crate erroneously allowed"][36886]
7619 - ["type parameter default erroneously allowed in invalid location"][36887]
7620 - ["detects super or self keywords at the beginning of global path"][36888]
7621 - ["two overlapping inherent impls define an item with the same name
7622 were erroneously allowed"][36889]
7623 - ["floating-point constants cannot be used in patterns"][36890]
7624 - ["constants of struct or enum type can only be used in a pattern if
7625 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7626 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7627 * [Prohibit patterns in trait methods without bodies][37378]
7628 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7629 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7630 * [The `$crate` macro variable is accepted in fewer locations][37213]
7631 * [Impls specifying extra region requirements beyond the trait
7632 they implement are rejected][37167]
7633 * [Enums may not be unsized][37111]. Unsized enums are intended to
7634 work but never have. For now they are forbidden.
7635 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7637 [tier 2]: https://forge.rust-lang.org/platform-support.html
7638 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7639 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7640 [36430]: https://github.com/rust-lang/rust/pull/36430
7641 [36595]: https://github.com/rust-lang/rust/pull/36595
7642 [36692]: https://github.com/rust-lang/rust/pull/36692
7643 [36767]: https://github.com/rust-lang/rust/pull/36767
7644 [36794]: https://github.com/rust-lang/rust/pull/36794
7645 [36798]: https://github.com/rust-lang/rust/pull/36798
7646 [36819]: https://github.com/rust-lang/rust/pull/36819
7647 [36822]: https://github.com/rust-lang/rust/pull/36822
7648 [36825]: https://github.com/rust-lang/rust/pull/36825
7649 [36843]: https://github.com/rust-lang/rust/pull/36843
7650 [36880]: https://github.com/rust-lang/rust/pull/36880
7651 [36886]: https://github.com/rust-lang/rust/issues/36886
7652 [36887]: https://github.com/rust-lang/rust/issues/36887
7653 [36888]: https://github.com/rust-lang/rust/issues/36888
7654 [36889]: https://github.com/rust-lang/rust/issues/36889
7655 [36890]: https://github.com/rust-lang/rust/issues/36890
7656 [36891]: https://github.com/rust-lang/rust/issues/36891
7657 [36892]: https://github.com/rust-lang/rust/issues/36892
7658 [36894]: https://github.com/rust-lang/rust/pull/36894
7659 [36917]: https://github.com/rust-lang/rust/pull/36917
7660 [36993]: https://github.com/rust-lang/rust/pull/36993
7661 [37037]: https://github.com/rust-lang/rust/pull/37037
7662 [37064]: https://github.com/rust-lang/rust/pull/37064
7663 [37094]: https://github.com/rust-lang/rust/pull/37094
7664 [37108]: https://github.com/rust-lang/rust/pull/37108
7665 [37111]: https://github.com/rust-lang/rust/pull/37111
7666 [37161]: https://github.com/rust-lang/rust/pull/37161
7667 [37162]: https://github.com/rust-lang/rust/pull/37162
7668 [37167]: https://github.com/rust-lang/rust/pull/37167
7669 [37178]: https://github.com/rust-lang/rust/pull/37178
7670 [37200]: https://github.com/rust-lang/rust/pull/37200
7671 [37213]: https://github.com/rust-lang/rust/pull/37213
7672 [37221]: https://github.com/rust-lang/rust/pull/37221
7673 [37224]: https://github.com/rust-lang/rust/pull/37224
7674 [37230]: https://github.com/rust-lang/rust/pull/37230
7675 [37231]: https://github.com/rust-lang/rust/pull/37231
7676 [37247]: https://github.com/rust-lang/rust/pull/37247
7677 [37267]: https://github.com/rust-lang/rust/pull/37267
7678 [37270]: https://github.com/rust-lang/rust/pull/37270
7679 [37273]: https://github.com/rust-lang/rust/pull/37273
7680 [37280]: https://github.com/rust-lang/rust/pull/37280
7681 [37298]: https://github.com/rust-lang/rust/pull/37298
7682 [37306]: https://github.com/rust-lang/rust/pull/37306
7683 [37310]: https://github.com/rust-lang/rust/pull/37310
7684 [37312]: https://github.com/rust-lang/rust/pull/37312
7685 [37313]: https://github.com/rust-lang/rust/pull/37313
7686 [37315]: https://github.com/rust-lang/rust/pull/37315
7687 [37318]: https://github.com/rust-lang/rust/pull/37318
7688 [37322]: https://github.com/rust-lang/rust/pull/37322
7689 [37326]: https://github.com/rust-lang/rust/pull/37326
7690 [37351]: https://github.com/rust-lang/rust/pull/37351
7691 [37356]: https://github.com/rust-lang/rust/pull/37356
7692 [37367]: https://github.com/rust-lang/rust/pull/37367
7693 [37373]: https://github.com/rust-lang/rust/pull/37373
7694 [37378]: https://github.com/rust-lang/rust/pull/37378
7695 [37389]: https://github.com/rust-lang/rust/pull/37389
7696 [37392]: https://github.com/rust-lang/rust/pull/37392
7697 [37427]: https://github.com/rust-lang/rust/pull/37427
7698 [37439]: https://github.com/rust-lang/rust/pull/37439
7699 [37445]: https://github.com/rust-lang/rust/pull/37445
7700 [37470]: https://github.com/rust-lang/rust/pull/37470
7701 [37569]: https://github.com/rust-lang/rust/pull/37569
7702 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7703 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7704 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7705 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7706 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7707 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7708 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7711 Version 1.13.0 (2016-11-10)
7712 ===========================
7717 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7718 errors, like the `try!` macro, described in [RFC 0243].
7719 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7720 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7721 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7722 * [Fix lifetime rules for 'if' conditions][36029]
7723 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7728 * [Add the `-C link-arg` argument][36574]
7729 * [Remove the old AST-based backend from rustc_trans][35764]
7730 * [Don't enable NEON by default on armv7 Linux][35814]
7731 * [Fix debug line number info for macro expansions][35238]
7732 * [Do not emit "class method" debuginfo for types that are not
7733 DICompositeType][36008]
7734 * [Warn about multiple conflicting #[repr] hints][34623]
7735 * [When sizing DST, don't double-count nested struct prefixes][36351]
7736 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7737 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7738 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7739 * [Expand macros without recursing to avoid stack overflows][36214]
7744 * [Replace macro backtraces with labeled local uses][35702]
7745 * [Improve error message for misplaced doc comments][33922]
7746 * [Buffer unix and lock windows to prevent message interleaving][35975]
7747 * [Update lifetime errors to specifically note temporaries][36171]
7748 * [Special case a few colors for Windows][36178]
7749 * [Suggest `use self` when such an import resolves][36289]
7750 * [Be more specific when type parameter shadows primitive type][36338]
7751 * Many minor improvements
7753 Compile-time Optimizations
7754 --------------------------
7756 * [Compute and cache HIR hashes at beginning][35854]
7757 * [Don't hash types in loan paths][36004]
7758 * [Cache projections in trans][35761]
7759 * [Optimize the parser's last token handling][36527]
7760 * [Only instantiate #[inline] functions in codegen units referencing
7761 them][36524]. This leads to big improvements in cases where crates export
7762 define many inline functions without using them directly.
7763 * [Lazily allocate TypedArena's first chunk][36592]
7764 * [Don't allocate during default HashSet creation][36734]
7771 * [`overflowing_abs`]
7772 * [`RefCell::try_borrow`]
7773 * [`RefCell::try_borrow_mut`]
7778 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7779 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7781 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7782 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7783 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7784 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7785 * [Use arc4rand on FreeBSD][35884]
7786 * [memrchr: Correct aligned offset computation][35969]
7787 * [Improve Demangling of Rust Symbols][36059]
7788 * [Use monotonic time in condition variables][35048]
7789 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7790 * [Implement conversion traits for `char`][35755]
7791 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7792 * [Zero first byte of CString on drop][36264]
7793 * [Inherit overflow checks for sum and product][36372]
7794 * [Add missing Eq implementations][36423]
7795 * [Implement `Debug` for `DirEntry`][36631]
7796 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7798 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7799 * [Implement more traits for `std::io::ErrorKind`][35911]
7800 * [Optimize BinaryHeap bounds checking][36072]
7801 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7802 `extend_with_element`][36355]
7803 * [Fix overflow checking in unsigned pow()][34942]
7808 * This release includes security fixes to both curl and OpenSSL.
7809 * [Fix transitive doctests when panic=abort][cargo/3021]
7810 * [Add --all-features flag to cargo][cargo/3038]
7811 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7812 * [Don't parse the home directory more than once][cargo/3078]
7813 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7814 * [Update OpenSSL to 1.0.2j][cargo/3121]
7815 * [Add license and license_file to cargo metadata output][cargo/3110]
7816 * [Make crates-io registry URL optional in config; ignore all changes to
7817 source.crates-io][cargo/3089]
7818 * [Don't download dependencies from other platforms][cargo/3123]
7819 * [Build transitive dev-dependencies when needed][cargo/3125]
7820 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7821 * [Avoid updating registry when adding existing deps][cargo/3144]
7822 * [Warn about path overrides that won't work][cargo/3136]
7823 * [Use workspaces during `cargo install`][cargo/3146]
7824 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7825 * [Add --message-format flag][cargo/3000]
7826 * [Pass target environment for rustdoc][cargo/3205]
7827 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7828 * [Update curl and curl-sys][cargo/3241]
7829 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7834 * [rustdoc: Add the `--sysroot` argument][36586]
7835 * [rustdoc: Fix a couple of issues with the search results][35655]
7836 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7837 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7838 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7843 * [Remove unmaintained style guide][35124]
7844 * [Add s390x support][36369]
7845 * [Initial work at Haiku OS support][36727]
7846 * [Add mips-uclibc targets][35734]
7847 * [Crate-ify compiler-rt into compiler-builtins][35021]
7848 * [Add rustc version info (git hash + date) to dist tarball][36213]
7849 * Many documentation improvements
7854 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7855 * [Deny (by default) transmuting from fn item types to pointer-sized
7856 types][34923]. Continuing the long transition to zero-sized fn items,
7858 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7860 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7861 * [Fix lifetime rules for 'if' conditions][36029].
7862 * [Inherit overflow checks for sum and product][36372].
7863 * [Forbid user-defined macros named "macro_rules"][36730].
7865 [33922]: https://github.com/rust-lang/rust/pull/33922
7866 [34623]: https://github.com/rust-lang/rust/pull/34623
7867 [34923]: https://github.com/rust-lang/rust/pull/34923
7868 [34942]: https://github.com/rust-lang/rust/pull/34942
7869 [35021]: https://github.com/rust-lang/rust/pull/35021
7870 [35048]: https://github.com/rust-lang/rust/pull/35048
7871 [35074]: https://github.com/rust-lang/rust/pull/35074
7872 [35124]: https://github.com/rust-lang/rust/pull/35124
7873 [35234]: https://github.com/rust-lang/rust/pull/35234
7874 [35238]: https://github.com/rust-lang/rust/pull/35238
7875 [35354]: https://github.com/rust-lang/rust/pull/35354
7876 [35559]: https://github.com/rust-lang/rust/pull/35559
7877 [35585]: https://github.com/rust-lang/rust/pull/35585
7878 [35627]: https://github.com/rust-lang/rust/pull/35627
7879 [35655]: https://github.com/rust-lang/rust/pull/35655
7880 [35702]: https://github.com/rust-lang/rust/pull/35702
7881 [35707]: https://github.com/rust-lang/rust/pull/35707
7882 [35728]: https://github.com/rust-lang/rust/pull/35728
7883 [35734]: https://github.com/rust-lang/rust/pull/35734
7884 [35755]: https://github.com/rust-lang/rust/pull/35755
7885 [35761]: https://github.com/rust-lang/rust/pull/35761
7886 [35764]: https://github.com/rust-lang/rust/pull/35764
7887 [35814]: https://github.com/rust-lang/rust/pull/35814
7888 [35854]: https://github.com/rust-lang/rust/pull/35854
7889 [35871]: https://github.com/rust-lang/rust/pull/35871
7890 [35884]: https://github.com/rust-lang/rust/pull/35884
7891 [35911]: https://github.com/rust-lang/rust/pull/35911
7892 [35969]: https://github.com/rust-lang/rust/pull/35969
7893 [35975]: https://github.com/rust-lang/rust/pull/35975
7894 [36004]: https://github.com/rust-lang/rust/pull/36004
7895 [36008]: https://github.com/rust-lang/rust/pull/36008
7896 [36014]: https://github.com/rust-lang/rust/pull/36014
7897 [36029]: https://github.com/rust-lang/rust/pull/36029
7898 [36059]: https://github.com/rust-lang/rust/pull/36059
7899 [36072]: https://github.com/rust-lang/rust/pull/36072
7900 [36101]: https://github.com/rust-lang/rust/pull/36101
7901 [36104]: https://github.com/rust-lang/rust/pull/36104
7902 [36171]: https://github.com/rust-lang/rust/pull/36171
7903 [36173]: https://github.com/rust-lang/rust/pull/36173
7904 [36178]: https://github.com/rust-lang/rust/pull/36178
7905 [36213]: https://github.com/rust-lang/rust/pull/36213
7906 [36214]: https://github.com/rust-lang/rust/pull/36214
7907 [36264]: https://github.com/rust-lang/rust/pull/36264
7908 [36266]: https://github.com/rust-lang/rust/pull/36266
7909 [36289]: https://github.com/rust-lang/rust/pull/36289
7910 [36338]: https://github.com/rust-lang/rust/pull/36338
7911 [36351]: https://github.com/rust-lang/rust/pull/36351
7912 [36355]: https://github.com/rust-lang/rust/pull/36355
7913 [36369]: https://github.com/rust-lang/rust/pull/36369
7914 [36372]: https://github.com/rust-lang/rust/pull/36372
7915 [36423]: https://github.com/rust-lang/rust/pull/36423
7916 [36482]: https://github.com/rust-lang/rust/pull/36482
7917 [36505]: https://github.com/rust-lang/rust/pull/36505
7918 [36524]: https://github.com/rust-lang/rust/pull/36524
7919 [36527]: https://github.com/rust-lang/rust/pull/36527
7920 [36551]: https://github.com/rust-lang/rust/pull/36551
7921 [36574]: https://github.com/rust-lang/rust/pull/36574
7922 [36586]: https://github.com/rust-lang/rust/pull/36586
7923 [36592]: https://github.com/rust-lang/rust/pull/36592
7924 [36631]: https://github.com/rust-lang/rust/pull/36631
7925 [36721]: https://github.com/rust-lang/rust/pull/36721
7926 [36727]: https://github.com/rust-lang/rust/pull/36727
7927 [36730]: https://github.com/rust-lang/rust/pull/36730
7928 [36734]: https://github.com/rust-lang/rust/pull/36734
7929 [36754]: https://github.com/rust-lang/rust/pull/36754
7930 [36995]: https://github.com/rust-lang/rust/pull/36995
7931 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7932 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7933 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7934 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7935 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7936 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7937 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7938 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7939 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7940 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7941 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7942 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7943 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7944 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7945 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7946 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7947 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7948 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7949 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7950 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7951 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7952 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7953 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7954 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7955 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7956 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7957 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7958 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7959 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7960 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7961 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7962 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7965 Version 1.12.1 (2016-10-20)
7966 ===========================
7971 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7972 * [Confusion with double negation and booleans][36856]
7973 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7974 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7975 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7976 * [Corrupted memory after updated to 1.12][36936]
7977 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7978 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7979 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7981 [36381]: https://github.com/rust-lang/rust/issues/36381
7982 [36856]: https://github.com/rust-lang/rust/issues/36856
7983 [36875]: https://github.com/rust-lang/rust/issues/36875
7984 [36924]: https://github.com/rust-lang/rust/issues/36924
7985 [36926]: https://github.com/rust-lang/rust/issues/36926
7986 [36936]: https://github.com/rust-lang/rust/issues/36936
7987 [37026]: https://github.com/rust-lang/rust/issues/37026
7988 [37112]: https://github.com/rust-lang/rust/issues/37112
7989 [37153]: https://github.com/rust-lang/rust/issues/37153
7992 Version 1.12.0 (2016-09-29)
7993 ===========================
7998 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7999 This translation pass is far simpler than the previous AST->LLVM pass, and
8000 creates opportunities to perform new optimizations directly on the MIR. It
8001 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8002 * [`rustc` presents a new, more readable error format, along with
8003 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8004 Most common editors supporting Rust have been updated to work with it. It was
8005 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8010 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8011 This translation pass is far simpler than the previous AST->LLVM pass, and
8012 creates opportunities to perform new optimizations directly on the MIR. It
8013 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8014 * [Print the Rust target name, not the LLVM target name, with
8015 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8016 * [The computation of `TypeId` is correct in some cases where it was previously
8017 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8018 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8019 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8020 `--print relocation-models`, and `--print code-models` print the available
8021 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8022 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8023 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8024 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8025 These targets produce statically-linked binaries. There are no binary release
8031 * [`rustc` presents a new, more readable error format, along with
8032 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8033 Most common editors supporting Rust have been updated to work with it. It was
8034 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8035 * [In error descriptions, references are now described in plain English,
8036 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8037 * [In error type descriptions, unknown numeric types are named `{integer}` or
8038 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8039 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8044 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8045 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8046 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8047 useful](https://github.com/rust-lang/rust/pull/34908)
8048 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8049 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8050 * [Semicolons are properly required as statement delimiters inside
8051 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8052 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8057 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8058 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8059 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8060 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8061 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8062 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8063 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8064 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8065 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8066 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8067 Both on Unix and Windows.
8068 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8069 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8070 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8071 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8072 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8073 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8074 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8075 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8080 * [The `format!` macro and friends now allow a single argument to be formatted
8081 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8082 * [The lifetime bounds on `[T]::binary_search_by` and
8083 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8084 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8085 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8086 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8087 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8088 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8089 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8090 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8091 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8092 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8093 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8094 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8095 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8096 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8097 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8098 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8099 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8100 * [`mpsc::sync_channel` `Receiver`s return any available message before
8101 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8102 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8103 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8108 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8109 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8110 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8111 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8112 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8113 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8114 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8115 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8116 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8117 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8118 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8119 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8120 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8121 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8122 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8123 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8128 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8129 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8134 * [Test binaries now support a `--test-threads` argument to specify the number
8135 of threads used to run tests, and which acts the same as the
8136 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8137 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8138 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8139 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8140 * [Rust releases now come with source packages that can be installed by rustup
8141 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8142 The resulting source code can be used by tools and IDES, located in the
8143 sysroot under `lib/rustlib/src`.
8148 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8149 * Many minor improvements to the documentation.
8150 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8155 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8156 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8157 * [When formatting strings, if "precision" is specified, the "fill",
8158 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8159 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8162 Version 1.11.0 (2016-08-18)
8163 ===========================
8168 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8169 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8170 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8171 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8176 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8177 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8178 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8179 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8180 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8181 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8182 (in libcore - previously stabilized in libstd)
8183 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8184 (in libcore - previously stabilized in libstd)
8185 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8186 (in libcore - previously stabilized in libstd)
8187 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8188 (in libcore - previously stabilized in libstd)
8189 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8190 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8191 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8192 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8197 * [The `thread_local!` macro supports multiple definitions in a single
8198 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8199 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8200 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8201 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8202 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8203 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8204 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8205 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8210 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8211 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8212 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8213 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8214 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8215 and `-vv` prints warnings for all crates.
8216 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8217 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8218 This provides room for expansion by arbitrary tools.
8219 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8220 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8221 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8222 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8223 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8224 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8225 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8230 * [Caching projections speeds up type check dramatically for some
8231 workloads](https://github.com/rust-lang/rust/pull/33816)
8232 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8233 This hasher is faster, but is believed to provide sufficient
8234 protection from collision attacks.
8235 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8240 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8241 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8242 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8243 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8244 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8249 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8250 * [When emitting debug info, rustc emits frame pointers for closures,
8251 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8252 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8253 * Many more errors have been given error codes and extended
8255 * API documentation continues to be improved, with many new examples
8260 * [rustc no longer hangs when dependencies recursively re-export
8261 submodules](https://github.com/rust-lang/rust/pull/34542)
8262 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8263 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8264 rewritten](https://github.com/rust-lang/rust/pull/33895)
8265 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8266 No targets use this yet, but it works toward AVR support.
8271 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8272 * [The new follow-set rules that place restrictions on `macro_rules!`
8273 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8274 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8275 and has been a warning since 1.10.
8276 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8277 This causes breakage in some corner cases.
8280 Version 1.10.0 (2016-07-07)
8281 ===========================
8286 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8287 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8288 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8289 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8290 * [`panic!` can be converted to a runtime abort with the
8291 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8292 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8293 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8294 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8295 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8296 Note that Cargo does not yet directly support cdylibs.
8301 * `os::windows::fs::OpenOptionsExt::access_mode`
8302 * `os::windows::fs::OpenOptionsExt::share_mode`
8303 * `os::windows::fs::OpenOptionsExt::custom_flags`
8304 * `os::windows::fs::OpenOptionsExt::attributes`
8305 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8306 * `os::unix::fs::OpenOptionsExt::custom_flags`
8307 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8308 * `Default for sync::Weak`
8309 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8310 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8311 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8312 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8313 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8314 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8315 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8316 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8317 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8318 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8319 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8320 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8321 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8322 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8323 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8324 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8325 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8326 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8327 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8328 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8329 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8330 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8331 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8332 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8333 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8334 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8335 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8336 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8337 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8338 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8339 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8340 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8341 * Read/Write/RawFd impls for `UnixStream`
8342 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8343 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8344 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8345 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8346 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8347 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8348 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8349 * RawFd impls for `UnixListener`
8350 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8351 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8352 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8353 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8354 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8355 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8356 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8357 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8358 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8359 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8360 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8361 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8362 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8363 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8364 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8365 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8366 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8367 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8368 * RawFd impls for `UnixDatagram`
8369 * `{BTree,Hash}Map::values_mut`
8370 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8375 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8376 The semantics of this minor method are subtle and probably not what
8378 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8379 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8380 will fall back to `/dev/urandom` temporarily to avoid blocking
8381 during early boot](https://github.com/rust-lang/rust/pull/33086).
8382 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8383 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8384 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8385 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8386 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8387 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8388 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8392 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8393 This controls the runtime behavior of the `panic!` macro
8394 and can be either "unwind" (the default), or "abort".
8395 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8396 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8397 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8398 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8399 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8400 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8401 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8402 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8403 By default they are retried twice, which can be customized with the
8404 `net.retry` value in `.cargo/config`.
8405 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8406 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8407 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8408 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8409 Makes it possible to install multiple crates in parallel.
8410 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8411 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8412 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8413 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8414 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8415 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8420 * [rustc memory usage was reduced by refactoring the context used for
8421 type checking](https://github.com/rust-lang/rust/pull/33425).
8422 * [Speed up creation of `HashMap`s by caching the random keys used
8423 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8424 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8425 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8426 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8427 10x faster than the previous lookup tables.
8428 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8433 * Many incremental improvements to documentation and rustdoc.
8434 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8435 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8436 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8437 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8438 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8439 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8440 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8445 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8446 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8447 * [`std` no longer prints backtraces on platforms where the running
8448 module must be loaded with `env::current_exe`, which can't be relied
8449 on](https://github.com/rust-lang/rust/pull/33554).
8450 * This release includes std binaries for the i586-unknown-linux-gnu,
8451 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8452 i586 target is for old x86 hardware without SSE2, and the armv7
8453 target is for Android running on modern ARM architectures.
8454 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8455 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8456 * [On Unix the runtime aborts by calling `libc::abort` instead of
8457 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8458 * [Rust is now bootstrapped from the previous release of Rust,
8459 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8464 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8465 * [`target_env` for Linux ARM targets is just `gnu`, not
8466 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8467 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8468 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8469 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8470 Affects how macros are parsed.
8471 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8472 * [Feature-gated attributes on macro-generated macro invocations are
8473 now rejected](https://github.com/rust-lang/rust/pull/32791).
8474 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8475 This caused some minor changes to type inference.
8478 Version 1.9.0 (2016-05-26)
8479 ==========================
8484 * The `#[deprecated]` attribute when applied to an API will generate
8485 warnings when used. The warnings may be suppressed with
8486 `#[allow(deprecated)]`. [RFC 1270].
8487 * [`fn` item types are zero sized, and each `fn` names a unique
8488 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8489 `transmute` on a `fn` type will generate a warning for a few cycles,
8490 then will be converted to an error.
8491 * [Field and method resolution understand visibility, so private
8492 fields and methods cannot prevent the proper use of public fields
8493 and methods][1.9fv].
8494 * [The parser considers unicode codepoints in the
8495 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8501 * [`std::panic::catch_unwind`] (renamed from `recover`)
8502 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8503 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8504 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8505 * [`str::is_char_boundary`]
8506 * [`<*const T>::as_ref`]
8507 * [`<*mut T>::as_ref`]
8508 * [`<*mut T>::as_mut`]
8509 * [`AsciiExt::make_ascii_uppercase`]
8510 * [`AsciiExt::make_ascii_lowercase`]
8511 * [`char::decode_utf16`]
8512 * [`char::DecodeUtf16`]
8513 * [`char::DecodeUtf16Error`]
8514 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8515 * [`BTreeSet::take`]
8516 * [`BTreeSet::replace`]
8519 * [`HashSet::replace`]
8521 * [`OsString::with_capacity`]
8522 * [`OsString::clear`]
8523 * [`OsString::capacity`]
8524 * [`OsString::reserve`]
8525 * [`OsString::reserve_exact`]
8526 * [`OsStr::is_empty`]
8528 * [`std::os::unix::thread`]
8531 * [`JoinHandleExt::as_pthread_t`]
8532 * [`JoinHandleExt::into_pthread_t`]
8533 * [`HashSet::hasher`]
8534 * [`HashMap::hasher`]
8535 * [`CommandExt::exec`]
8536 * [`File::try_clone`]
8537 * [`SocketAddr::set_ip`]
8538 * [`SocketAddr::set_port`]
8539 * [`SocketAddrV4::set_ip`]
8540 * [`SocketAddrV4::set_port`]
8541 * [`SocketAddrV6::set_ip`]
8542 * [`SocketAddrV6::set_port`]
8543 * [`SocketAddrV6::set_flowinfo`]
8544 * [`SocketAddrV6::set_scope_id`]
8545 * [`slice::copy_from_slice`]
8546 * [`ptr::read_volatile`]
8547 * [`ptr::write_volatile`]
8548 * [`OpenOptions::create_new`]
8549 * [`TcpStream::set_nodelay`]
8550 * [`TcpStream::nodelay`]
8551 * [`TcpStream::set_ttl`]
8552 * [`TcpStream::ttl`]
8553 * [`TcpStream::set_only_v6`]
8554 * [`TcpStream::only_v6`]
8555 * [`TcpStream::take_error`]
8556 * [`TcpStream::set_nonblocking`]
8557 * [`TcpListener::set_ttl`]
8558 * [`TcpListener::ttl`]
8559 * [`TcpListener::set_only_v6`]
8560 * [`TcpListener::only_v6`]
8561 * [`TcpListener::take_error`]
8562 * [`TcpListener::set_nonblocking`]
8563 * [`UdpSocket::set_broadcast`]
8564 * [`UdpSocket::broadcast`]
8565 * [`UdpSocket::set_multicast_loop_v4`]
8566 * [`UdpSocket::multicast_loop_v4`]
8567 * [`UdpSocket::set_multicast_ttl_v4`]
8568 * [`UdpSocket::multicast_ttl_v4`]
8569 * [`UdpSocket::set_multicast_loop_v6`]
8570 * [`UdpSocket::multicast_loop_v6`]
8571 * [`UdpSocket::set_multicast_ttl_v6`]
8572 * [`UdpSocket::multicast_ttl_v6`]
8573 * [`UdpSocket::set_ttl`]
8574 * [`UdpSocket::ttl`]
8575 * [`UdpSocket::set_only_v6`]
8576 * [`UdpSocket::only_v6`]
8577 * [`UdpSocket::join_multicast_v4`]
8578 * [`UdpSocket::join_multicast_v6`]
8579 * [`UdpSocket::leave_multicast_v4`]
8580 * [`UdpSocket::leave_multicast_v6`]
8581 * [`UdpSocket::take_error`]
8582 * [`UdpSocket::connect`]
8583 * [`UdpSocket::send`]
8584 * [`UdpSocket::recv`]
8585 * [`UdpSocket::set_nonblocking`]
8590 * [`std::sync::Once` is poisoned if its initialization function
8592 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8593 * [Most types implement `fmt::Debug`][1.9db].
8594 * [The default buffer size used by `BufReader` and `BufWriter` was
8595 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8596 used by other languages.
8597 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8598 `Duration` additionally implements `*=` and `/=`][1.9ta].
8599 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8600 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8601 * [`Chain` implements `BufRead`][1.9ch].
8602 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8607 * [Cargo can now run concurrently][1.9cc].
8608 * [Top-level overrides allow specific revisions of crates to be
8609 overridden through the entire crate graph][1.9ct]. This is intended
8610 to make upgrades easier for large projects, by allowing crates to be
8611 forked temporarily until they've been upgraded and republished.
8612 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8613 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8614 on the commandline][1.9cf]. `rustc` arguments can also be specified
8615 in the `build.rustflags` configuration key.
8620 * [The time complexity of comparing variables for equivalence during type
8621 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8622 to major compilation time improvement in some scenarios.
8623 * [`ToString` is specialized for `str`, giving it the same performance
8624 as `to_owned`][1.9ts].
8625 * [Spawning processes with `Command::output` no longer creates extra
8627 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8628 for C-like enums][1.9cl].
8633 * [Passing the `--quiet` flag to a test runner will produce
8634 much-abbreviated output][1.9q].
8635 * The Rust Project now publishes std binaries for the
8636 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8637 `i586-pc-windows-msvc` targets.
8642 * [`std::sync::Once` is poisoned if its initialization function
8644 * [It is illegal to define methods with the same name in overlapping
8645 inherent `impl` blocks][1.9sn].
8646 * [`fn` item types are zero sized, and each `fn` names a unique
8647 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8648 `transmute` on a `fn` type will generate a warning for a few cycles,
8649 then will be converted to an error.
8650 * [Improvements to const evaluation may trigger new errors when integer
8651 literals are out of range][1.9ce].
8654 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8655 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8656 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8657 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8658 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8659 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8660 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8661 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8662 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8663 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8664 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8665 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8666 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8667 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8668 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8669 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8670 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8671 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8672 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8673 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8674 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8675 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8676 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8677 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8678 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8679 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8680 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8681 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8682 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8683 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8684 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8685 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8686 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8687 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8688 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8689 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8690 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8691 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8692 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8693 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8694 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8695 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8696 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8697 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8698 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8699 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8700 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8701 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8702 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8703 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8704 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8705 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8706 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8707 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8708 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8709 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8710 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8711 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8712 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8713 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8714 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8715 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8716 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8717 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8718 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8719 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8720 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8721 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8722 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8723 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8724 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8725 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8726 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8727 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8728 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8729 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8730 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8731 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8732 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8733 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8734 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8735 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8736 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8737 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8738 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8739 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8740 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8741 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8742 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8743 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8744 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8745 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8746 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8747 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8748 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8749 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8750 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8751 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8752 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8753 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8754 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8755 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8756 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8757 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8758 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8759 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8760 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8761 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8762 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8763 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8766 Version 1.8.0 (2016-04-14)
8767 ==========================
8772 * Rust supports overloading of compound assignment statements like
8773 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8774 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8775 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8777 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8778 addition to the non-braced form, `struct Foo;`. [RFC 218].
8784 * [`str::encode_utf16`] (renamed from `utf16_units`)
8785 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8788 * [`ptr::drop_in_place`]
8790 * [`time::SystemTime`]
8792 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8793 * [`Instant::elapsed`]
8794 * [`SystemTime::now`]
8795 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8796 * [`SystemTime::elapsed`]
8797 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8798 * [`SystemTimeError`]
8799 * [`SystemTimeError::duration`]
8800 * Various impls for `SystemTimeError`
8802 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8803 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8804 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8805 * [The `write!` and `writeln!` macros correctly emit errors if any of
8806 their arguments can't be formatted][1.8w].
8807 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8808 * [The Unix-specific `raw` modules, which contain a number of
8809 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8810 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8811 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8812 across platforms was making it difficult to implement `std`
8813 correctly. Those that need these definitions should use the `libc`
8815 * The Unix-specific `MetadataExt` traits, including
8816 `os::unix::fs::MetadataExt`, which expose values such as inode
8817 numbers [no longer return platform-specific types][1.8r], but
8818 instead return widened integers. [RFC 1415].
8819 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8820 * [Atomic loads and stores are not volatile][1.8a].
8821 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8826 * [Inlining hash functions lead to a 3% compile-time improvement in
8827 some workloads][1.8h].
8828 * When using jemalloc, its symbols are [unprefixed so that it
8829 overrides the libc malloc implementation][1.8h]. This means that for
8830 rustc, LLVM is now using jemalloc, which results in a 6%
8831 compile-time improvement on a specific workload.
8832 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8837 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8838 i686-pc-windows-msvc is now considered a tier-1 platform.
8839 * [The `--print targets` flag prints a list of supported targets][1.8t].
8840 * [The `--print cfg` flag prints the `cfg`s defined for the current
8842 * [`rustc` can be built with an new Cargo-based build system, written
8843 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8844 build system. To enable it configure with `configure --rustbuild`.
8845 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8846 variants while also indicating the total number of missing variants
8847 if more than 3][1.8m].
8848 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8849 * The Rust Project now publishes binary releases of the standard
8850 library for a number of tier-2 targets:
8851 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8852 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8853 `x86_64-rumprun-netbsd`. These can be installed with
8854 tools such as [multirust][1.8mr].
8859 * [`cargo init` creates a new Cargo project in the current
8860 directory][1.8ci]. It is otherwise like `cargo new`.
8861 * [Cargo has configuration keys for `-v` and
8862 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8863 `[term]` section of `.cargo/config`.
8864 * [Configuration keys that evaluate to strings or integers can be set
8865 via environment variables][1.8ce]. For example the `build.jobs` key
8866 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8867 precedence over config files.
8868 * [Target-specific dependencies support Rust `cfg` syntax for
8869 describing targets][1.8cfg] so that dependencies for multiple
8870 targets can be specified together. [RFC 1361].
8871 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8872 `RUSTDOC` take precedence over the `build.target-dir`,
8873 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8874 * [The child process tree is killed on Windows when Cargo is
8876 * [The `build.target` configuration value sets the target platform,
8877 like `--target`][1.8ct].
8882 * [Unstable compiler flags have been further restricted][1.8u]. Since
8883 1.0 `-Z` flags have been considered unstable, and other flags that
8884 were considered unstable additionally required passing `-Z
8885 unstable-options` to access. Unlike unstable language and library
8886 features though, these options have been accessible on the stable
8887 release channel. Going forward, *new unstable flags will not be
8888 available on the stable release channel*, and old unstable flags
8889 will warn about their usage. In the future, all unstable flags will
8890 be unavailable on the stable release channel.
8891 * [It is no longer possible to `match` on empty enum variants using
8892 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8893 * The Unix-specific `MetadataExt` traits, including
8894 `os::unix::fs::MetadataExt`, which expose values such as inode
8895 numbers [no longer return platform-specific types][1.8r], but
8896 instead return widened integers. [RFC 1415].
8897 * [Modules sourced from the filesystem cannot appear within arbitrary
8898 blocks, but only within other modules][1.8mf].
8899 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8900 * On Unix, [stack overflow triggers a runtime abort instead of a
8902 * [`Command::spawn` and its equivalents return an error if any of
8903 its command-line arguments contain interior `NUL`s][1.8n].
8904 * [Tuple and unit enum variants from other crates are in the type
8906 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8907 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8908 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8909 instead of `foo.lib`.
8912 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8913 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8914 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8915 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8916 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8917 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8918 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8919 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8920 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8921 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8922 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8923 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8924 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8925 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8926 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8927 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8928 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8929 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8930 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8931 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8932 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8933 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8934 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8935 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8936 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8937 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8938 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8939 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8940 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8941 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8942 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8943 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8944 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8945 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8946 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8947 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8948 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8949 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8950 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8951 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8952 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8953 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8954 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8955 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8956 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8957 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8958 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8959 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8960 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8961 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8962 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8963 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8964 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8965 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8966 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8967 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8968 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8969 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8970 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8971 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8974 Version 1.7.0 (2016-03-03)
8975 ==========================
8982 * [`Path::strip_prefix`] (renamed from relative_from)
8983 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8985 * [`Ipv4Addr::is_loopback`]
8986 * [`Ipv4Addr::is_private`]
8987 * [`Ipv4Addr::is_link_local`]
8988 * [`Ipv4Addr::is_multicast`]
8989 * [`Ipv4Addr::is_broadcast`]
8990 * [`Ipv4Addr::is_documentation`]
8992 * [`Ipv6Addr::is_unspecified`]
8993 * [`Ipv6Addr::is_loopback`]
8994 * [`Ipv6Addr::is_multicast`]
8997 * [`Vec::as_mut_slice`]
8999 * [`String::as_str`]
9000 * [`String::as_mut_str`]
9002 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9004 * `<[T]>::`[`sort_by_key`]
9005 * checked, saturated, and overflowing operations
9006 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9007 * [`i32::saturating_mul`]
9008 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9009 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9010 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9011 * [`u32::saturating_mul`]
9012 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9013 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9014 * and checked, saturated, and overflowing operations for other primitive types
9016 * [`ffi::IntoStringError`]
9017 * [`CString::into_string`]
9018 * [`CString::into_bytes`]
9019 * [`CString::into_bytes_with_nul`]
9020 * `From<CString> for Vec<u8>`
9022 * [`IntoStringError::into_cstring`]
9023 * [`IntoStringError::utf8_error`]
9024 * `Error for IntoStringError`
9026 * [`std::hash::BuildHasher`]
9027 * [`BuildHasher::Hasher`]
9028 * [`BuildHasher::build_hasher`]
9029 * [`std::hash::BuildHasherDefault`]
9030 * [`HashMap::with_hasher`]
9031 * [`HashMap::with_capacity_and_hasher`]
9032 * [`HashSet::with_hasher`]
9033 * [`HashSet::with_capacity_and_hasher`]
9034 * [`std::collections::hash_map::RandomState`]
9035 * [`RandomState::new`]
9036 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9037 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9038 from bytes is faster.
9039 * [The performance of `LineWriter` (and thus `io::stdout`) was
9040 improved by using `memchr` to search for newlines][1.7m].
9041 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9042 `f64` variants were stabilized previously.
9043 * [`BTreeMap` was rewritten to use less memory and improve the performance
9044 of insertion and iteration, the latter by as much as 5x][1.7bm].
9045 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9046 covariant over their contained type][1.7bt].
9047 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9048 over their contained type][1.7ll].
9049 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9051 * [`Any` is implemented for unsized types][1.7a].
9052 * [`Hash` is implemented for `Duration`][1.7h].
9057 * [When running tests with `--test`, rustdoc will pass `--cfg`
9058 arguments to the compiler][1.7dt].
9059 * [The compiler is built with RPATH information by default][1.7rpa].
9060 This means that it will be possible to run `rustc` when installed in
9061 unusual configurations without configuring the dynamic linker search
9063 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9064 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9065 over `LD_LIBRARY_PATH`.
9070 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9071 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9072 * [The `rerun-if-changed` build script directive no longer causes the
9073 build script to incorrectly run twice in certain scenarios][1.7rr].
9078 * Soundness fixes to the interactions between associated types and
9079 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9080 code that violates the new rules. This is a significant change that
9081 is known to break existing code, so it has emitted warnings for the
9082 new error cases since 1.4 to give crate authors time to adapt. The
9083 details of what is changing are subtle; read the RFC for more.
9084 * [Several bugs in the compiler's visibility calculations were
9085 fixed][1.7v]. Since this was found to break significant amounts of
9086 code, the new errors will be emitted as warnings for several release
9087 cycles, under the `private_in_public` lint.
9088 * Defaulted type parameters were accidentally accepted in positions
9089 that were not intended. In this release, [defaulted type parameters
9090 appearing outside of type definitions will generate a
9091 warning][1.7d], which will become an error in future releases.
9092 * [Parsing "." as a float results in an error instead of 0][1.7p].
9093 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9094 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9096 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9097 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9098 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9099 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9100 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9101 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9102 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9103 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9104 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9105 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9106 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9107 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9108 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9109 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9110 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9111 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9112 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9113 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9114 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9115 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9116 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9117 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9118 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9119 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9120 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9121 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9122 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9123 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9124 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9125 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9126 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9127 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9128 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9129 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9130 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9131 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9132 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9133 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9134 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9135 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9136 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9137 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9138 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9139 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9140 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9141 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9142 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9143 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9144 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9145 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9146 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9147 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9148 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9149 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9150 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9151 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9152 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9153 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9154 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9155 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9156 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9157 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9158 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9159 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9160 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9161 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9162 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9163 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9164 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9165 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9166 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9167 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9168 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9169 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9170 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9171 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9172 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9173 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9174 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9177 Version 1.6.0 (2016-01-21)
9178 ==========================
9183 * The `#![no_std]` attribute causes a crate to not be linked to the
9184 standard library, but only the [core library][1.6co], as described
9185 in [RFC 1184]. The core library defines common types and traits but
9186 has no platform dependencies whatsoever, and is the basis for Rust
9187 software in environments that cannot support a full port of the
9188 standard library, such as operating systems. Most of the core
9189 library is now stable.
9195 [`Read::read_exact`],
9196 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9197 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9198 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9199 [`os::unix::fs::DirBuilderExt`],
9200 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9201 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9202 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9203 [`collections::hash_map::Drain`],
9204 [`collections::hash_map::HashMap::drain`],
9205 [`collections::hash_set::Drain`],
9206 [`collections::hash_set::HashSet::drain`],
9207 [`collections::binary_heap::Drain`],
9208 [`collections::binary_heap::BinaryHeap::drain`],
9209 [`Vec::extend_from_slice`] (renamed from `push_all`),
9210 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9211 [`RwLock::into_inner`],
9212 [`Iterator::min_by_key`] (renamed from `min_by`),
9213 [`Iterator::max_by_key`] (renamed from `max_by`).
9214 * The [core library][1.6co] is stable, as are most of its APIs.
9215 * [The `assert_eq!` macro supports arguments that don't implement
9216 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9218 * Several timer functions that take duration in milliseconds [are
9219 deprecated in favor of those that take `Duration`][1.6ms]. These
9220 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9221 `thread::park_timeout_ms`.
9222 * The algorithm by which `Vec` reserves additional elements was
9223 [tweaked to not allocate excessive space][1.6a] while still growing
9225 * `From` conversions are [implemented from integers to floats][1.6f]
9226 in cases where the conversion is lossless. Thus they are not
9227 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9228 or `f64`. They are also not implemented for `isize` and `usize`
9229 because the implementations would be platform-specific. `From` is
9230 also implemented from `f32` to `f64`.
9231 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9232 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9233 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9234 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9236 * Sorting slices that are already sorted [is 50% faster in some
9242 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9243 * Cargo build scripts can specify their dependencies by emitting the
9244 [`rerun-if-changed`][1.6rr] key.
9245 * crates.io will reject publication of crates with dependencies that
9246 have a wildcard version constraint. Crates with wildcard
9247 dependencies were seen to cause a variety of problems, as described
9248 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9250 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9251 release folder. A variety of artifacts that Cargo failed to clean
9252 are now correctly deleted.
9257 * The `unreachable_code` lint [warns when a function call's argument
9259 * The parser indicates [failures that may be caused by
9260 confusingly-similar Unicode characters][1.6uc]
9261 * Certain macro errors [are reported at definition time][1.6m], not
9267 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9268 environment variable when locating crates. This was a pre-cargo
9269 feature for integrating with the package manager that was
9270 accidentally never removed.
9271 * [A number of bugs were fixed in the privacy checker][1.6p] that
9272 could cause previously-accepted code to break.
9273 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9274 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9275 struct pattern syntax (`Foo(..)`) can no longer be used to match
9276 unit structs. This is a warning now, but will become an error in
9277 future releases. Patterns that share the same name as a const are
9279 * A bug was fixed that causes [rustc not to apply default type
9280 parameters][1.6xc] when resolving certain method implementations of
9281 traits defined in other crates.
9283 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9284 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9285 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9286 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9287 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9288 [1.6co]: http://doc.rust-lang.org/core/index.html
9289 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9290 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9291 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9292 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9293 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9294 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9295 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9296 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9297 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9298 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9299 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9300 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9301 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9302 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9303 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9304 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9305 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9306 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9307 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9308 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9309 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9310 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9311 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9312 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9313 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9314 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9315 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9316 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9317 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9318 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9319 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9320 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9321 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9322 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9323 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9324 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9325 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9326 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9327 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9328 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9329 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9332 Version 1.5.0 (2015-12-10)
9333 ==========================
9335 * ~700 changes, numerous bugfixes
9341 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9342 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9343 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9344 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9345 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9346 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9347 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9348 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9349 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9350 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9351 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9352 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9353 [`Path::read_link`], [`Path::symlink_metadata`],
9354 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9355 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9356 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9357 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9358 [`slice::split_first_mut`], [`slice::split_first`],
9359 [`slice::split_last_mut`], [`slice::split_last`],
9360 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9361 [`str::MatchIndices`], [`str::RMatchIndices`],
9362 [`str::match_indices`], [`str::rmatch_indices`],
9363 [`str::slice_mut_unchecked`], [`string::ParseError`].
9364 * Rust applications hosted on crates.io can be installed locally to
9365 `~/.cargo/bin` with the [`cargo install`] command. Among other
9366 things this makes it easier to augment Cargo with new subcommands:
9367 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9368 invoked as `cargo foo`.
9369 * Crates with wildcard (`*`) dependencies will [emit warnings when
9370 published][1.5w]. In 1.6 it will no longer be possible to publish
9371 crates with wildcard dependencies.
9376 * The rules determining when a particular lifetime must outlive
9377 a particular value (known as '[dropck]') have been [modified
9378 to not rely on parametricity][1.5p].
9379 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9380 and `Arc`][1.5a]. Because these smart pointer types implement
9381 `Deref`, this causes breakage in cases where the interior type
9382 contains methods of the same name.
9383 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9384 that they could drop their content. Soundness fix.
9385 * All method invocations are [properly checked][1.5wf1] for
9386 [well-formedness][1.5wf2]. Soundness fix.
9387 * Traits whose supertraits contain `Self` are [not object
9388 safe][1.5o]. Soundness fix.
9389 * Target specifications support a [`no_default_libraries`][1.5nd]
9390 setting that controls whether `-nodefaultlibs` is passed to the
9391 linker, and in turn the `is_like_windows` setting no longer affects
9392 the `-nodefaultlibs` flag.
9393 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9394 * The `#[inline]` and `#[repr]` attributes [can only appear
9395 in valid locations][1.5at].
9396 * Native libraries linked from the local crate are [passed to
9397 the linker before native libraries from upstream crates][1.5nl].
9398 * Two rarely-used attributes, `#[no_debug]` and
9399 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9400 * Negation of unsigned integers, which has been a warning for
9401 several releases, [is now behind a feature gate and will
9402 generate errors][1.5nu].
9403 * The parser accidentally accepted visibility modifiers on
9404 enum variants, a bug [which has been fixed][1.5ev].
9405 * [A bug was fixed that allowed `use` statements to import unstable
9411 * When evaluating expressions at compile-time that are not
9412 compile-time constants (const-evaluating expressions in non-const
9413 contexts), incorrect code such as overlong bitshifts and arithmetic
9414 overflow will [generate a warning instead of an error][1.5ce],
9415 delaying the error until runtime. This will allow the
9416 const-evaluator to be expanded in the future backwards-compatibly.
9417 * The `improper_ctypes` lint [no longer warns about using `isize` and
9418 `usize` in FFI][1.5ict].
9423 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9425 * `Default` is [implemented for mutable slices][1.5d].
9426 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9427 * There are now `From` conversions [between floating point
9428 types][1.5f] where the conversions are lossless.
9429 * There are now `From` conversions [between integer types][1.5i] where
9430 the conversions are lossless.
9431 * [`fs::Metadata` implements `Clone`][1.5fs].
9432 * The `parse` method [accepts a leading "+" when parsing
9434 * [`AsMut` is implemented for `Vec`][1.5am].
9435 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9436 been optimized][1.5cf] and no longer rely on the default impl.
9437 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9438 `unsafe extern "C"` function types now [implement `Clone`,
9439 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9440 `fmt::Debug` for up to 12 arguments][1.5fp].
9441 * [Dropping `Vec`s is much faster in unoptimized builds when the
9442 element types don't implement `Drop`][1.5dv].
9443 * A bug that caused in incorrect behavior when [combining `VecDeque`
9444 with zero-sized types][1.5vdz] was resolved.
9445 * [`PartialOrd` for slices is faster][1.5po].
9450 * [Crate metadata size was reduced by 20%][1.5md].
9451 * [Improvements to code generation reduced the size of libcore by 3.3
9452 MB and rustc's memory usage by 18MB][1.5m].
9453 * [Improvements to deref translation increased performance in
9454 unoptimized builds][1.5dr].
9455 * Various errors in trait resolution [are deduplicated to only be
9456 reported once][1.5te].
9457 * Rust has preliminary [support for rumprun kernels][1.5rr].
9458 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9460 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9461 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9462 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9463 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9464 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9465 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9466 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9467 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9468 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9469 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9470 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9471 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9472 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9473 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9474 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9475 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9476 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9477 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9478 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9479 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9480 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9481 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9482 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9483 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9484 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9485 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9486 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9487 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9488 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9489 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9490 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9491 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9492 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9493 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9494 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9495 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9496 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9497 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9498 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9499 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9500 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9501 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9502 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9503 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9504 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9505 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9506 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9507 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9508 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9509 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9510 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9511 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9512 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9513 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9514 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9515 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9516 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9517 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9518 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9519 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9520 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9521 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9522 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9523 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9524 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9525 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9526 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9527 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9528 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9529 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9530 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9531 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9532 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9533 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9534 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9535 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9536 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9537 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9538 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9539 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9540 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9541 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9542 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9543 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9544 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9545 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9546 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9547 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9548 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9550 Version 1.4.0 (2015-10-29)
9551 ==========================
9553 * ~1200 changes, numerous bugfixes
9558 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9559 GNU) are now supported and recommended for use.
9564 * [Several changes have been made to fix type soundness and improve
9565 the behavior of associated types][sound]. See [RFC 1214]. Although
9566 we have mostly introduced these changes as warnings this release, to
9567 become errors next release, there are still some scenarios that will
9568 see immediate breakage.
9569 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9570 line breaks in addition to `\n`][crlf].
9571 * [Loans of `'static` lifetime extend to the end of a function][stat].
9572 * [`str::parse` no longer introduces avoidable rounding error when
9573 parsing floating point numbers. Together with earlier changes to
9574 float formatting/output, "round trips" like f.to_string().parse()
9575 now preserve the value of f exactly. Additionally, leading plus
9576 signs are now accepted][fp3].
9582 * `use` statements that import multiple items [can now rename
9583 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9584 * [Binops work correctly on fat pointers][binfat].
9585 * `pub extern crate`, which does not behave as expected, [issues a
9586 warning][pec] until a better solution is found.
9591 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9592 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9593 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9594 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9595 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9596 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9597 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9598 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9599 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9600 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9601 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9602 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9603 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9604 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9605 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9606 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9607 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9608 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9610 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9611 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9612 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9613 `f64::from_str_radix`.
9614 * [Reverse-searching strings is faster with the 'two-way'
9616 * [`std::io::copy` allows `?Sized` arguments][cc].
9617 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9618 [override `count`, `nth` and `last` with an *O*(1)
9619 implementation][it].
9620 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9621 * [`IntoRawFd` has been added to the Unix-specific prelude,
9622 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9624 * [`Extend<String>` and `FromIterator<String` are both implemented for
9626 * [`IntoIterator` is implemented for references to `Option` and
9628 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9629 Copy`][ext] as part of [RFC 839]. This will cause type inference
9630 breakage in rare situations.
9631 * [`BinaryHeap` implements `Debug`][bh2].
9632 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9634 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9635 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9636 * [String comparison is faster][faststr].
9637 * `&mut T` where `T: std::fmt::Write` [also implements
9638 `std::fmt::Write`][mutw].
9639 * [A stable regression in `VecDeque::push_back` and other
9640 capacity-altering methods that caused panics for zero-sized types
9642 * [Function pointers implement traits for up to 12 parameters][fp2].
9647 * The compiler [no longer uses the 'morestack' feature to prevent
9648 stack overflow][mm]. Instead it uses guard pages and stack
9649 probes (though stack probes are not yet implemented on any platform
9651 * [The compiler matches traits faster when projections are involved][p].
9652 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9654 * [Cargo now displays useful information about what its doing during
9655 `cargo update`][cu].
9657 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9658 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9659 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9660 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9661 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9662 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9663 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9664 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9665 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9666 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9667 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9668 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9669 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9670 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9671 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9672 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9673 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9674 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9675 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9676 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9677 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9678 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9679 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9680 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9681 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9682 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9683 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9684 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9685 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9686 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9687 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9688 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9689 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9690 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9691 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9692 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9693 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9694 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9695 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9696 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9697 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9698 [bh2]: https://github.com/rust-lang/rust/pull/28156
9699 [binfat]: https://github.com/rust-lang/rust/pull/28270
9700 [bm]: https://github.com/rust-lang/rust/pull/28197
9701 [cc]: https://github.com/rust-lang/rust/pull/27531
9702 [crlf]: https://github.com/rust-lang/rust/pull/28034
9703 [cu]: https://github.com/rust-lang/cargo/pull/1931
9704 [d]: https://github.com/rust-lang/rust/pull/27825
9705 [dep]: https://github.com/rust-lang/rust/pull/28339
9706 [es]: https://github.com/rust-lang/rust/pull/27956
9707 [ext]: https://github.com/rust-lang/rust/pull/28094
9708 [faststr]: https://github.com/rust-lang/rust/pull/28338
9709 [ffi]: https://github.com/rust-lang/rust/pull/28779
9710 [fp]: https://github.com/rust-lang/rust/pull/28268
9711 [fp2]: https://github.com/rust-lang/rust/pull/28560
9712 [fp3]: https://github.com/rust-lang/rust/pull/27307
9713 [i]: https://github.com/rust-lang/rust/pull/27451
9714 [into2]: https://github.com/rust-lang/rust/pull/28039
9715 [it]: https://github.com/rust-lang/rust/pull/27652
9716 [mm]: https://github.com/rust-lang/rust/pull/27338
9717 [mutw]: https://github.com/rust-lang/rust/pull/28368
9718 [sound]: https://github.com/rust-lang/rust/pull/27641
9719 [p]: https://github.com/rust-lang/rust/pull/27866
9720 [pec]: https://github.com/rust-lang/rust/pull/28486
9721 [pr]: https://github.com/rust-lang/rust/pull/27896
9722 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9723 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9724 [s]: https://github.com/rust-lang/rust/pull/27474
9725 [stab]: https://github.com/rust-lang/rust/pull/28339
9726 [stat]: https://github.com/rust-lang/rust/pull/28321
9727 [vd]: https://github.com/rust-lang/rust/pull/28494
9729 Version 1.3.0 (2015-09-17)
9730 ==============================
9732 * ~900 changes, numerous bugfixes
9737 * The [new object lifetime defaults][nold] have been [turned
9738 on][nold2] after a cycle of warnings about the change. Now types
9739 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9740 being interpreted as `&'a Box<Trait+'a>` to `&'a
9741 Box<Trait+'static>`.
9742 * [The Rustonomicon][nom] is a new book in the official documentation
9743 that dives into writing unsafe Rust.
9744 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9745 timekeeping is employed by other std APIs, as well as out-of-tree
9751 * The [new object lifetime defaults][nold] have been [turned
9752 on][nold2] after a cycle of warnings about the change.
9753 * There is a known [regression][lr] in how object lifetime elision is
9754 interpreted, the proper solution for which is undetermined.
9755 * The `#[prelude_import]` attribute, an internal implementation
9756 detail, was accidentally stabilized previously. [It has been put
9757 behind the `prelude_import` feature gate][pi]. This change is
9758 believed to break no existing code.
9759 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9760 [more sane for dynamically sized types][dst3]. Code that relied on
9761 the previous behavior is thought to be broken.
9762 * The `dropck` rules, which checks that destructors can't access
9763 destroyed values, [have been updated][dropck] to match the
9764 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9765 cause some previously-compiling code to no longer build.
9770 * The [new object lifetime defaults][nold] have been [turned
9771 on][nold2] after a cycle of warnings about the change.
9772 * Semicolons may [now follow types and paths in
9773 macros](https://github.com/rust-lang/rust/pull/27000).
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 not known to exist, and suspected to be
9778 * `'static` variables [may now be recursive][st].
9779 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9780 implementations correctly.
9781 * The `dropck` rules, which checks that destructors can't access
9782 destroyed values, [have been updated][dropck] to match the
9788 * The [`Duration`] API, [has been stabilized][ds], as well as the
9789 `std::time` module, which presently contains only `Duration`.
9790 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9791 * The owned C string, [`CString`], implements [`Borrow`] and the
9792 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9793 these allow C strings to be borrowed and cloned in generic code.
9794 * [`CStr`] implements [`Debug`].
9795 * [`AtomicPtr`] implements [`Debug`].
9796 * [`Error`] trait objects [can be downcast to their concrete types][e]
9797 in many common configurations, using the [`is`], [`downcast`],
9798 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9800 * Searching for substrings now [employs the two-way algorithm][search]
9801 instead of doing a naive search. This gives major speedups to a
9802 number of methods, including [`contains`][sc], [`find`][sf],
9803 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9804 [`ends_with`][sew] are also faster.
9805 * The performance of `PartialEq` for slices is [much faster][ps].
9806 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9807 is overridden and optimized by the implementations for scalars.
9808 * The [`Hasher`] trait now has a number of specialized `write_*`
9809 methods for primitive types, for efficiency.
9810 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9811 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9812 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9813 of [`std::error::Error::cause`][iec] also delegates to the inner
9815 * [`process::Child`][pc] gained the [`id`] method, which returns a
9816 `u32` representing the platform-specific process identifier.
9817 * The [`connect`] method on slices is deprecated, replaced by the new
9818 [`join`] method (note that both of these are on the *unstable*
9819 [`SliceConcatExt`] trait, but through the magic of the prelude are
9820 available to stable code anyway).
9821 * The [`Div`] operator is implemented for [`Wrapping`] types.
9822 * [`DerefMut` is implemented for `String`][dms].
9823 * Performance of SipHash (the default hasher for `HashMap`) is
9824 [better for long data][sh].
9825 * [`AtomicPtr`] implements [`Send`].
9826 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9827 are now [specialized to use uninitialized buffers for increased
9829 * Lifetime parameters of foreign functions [are now resolved
9835 * Rust can now, with some coercion, [produce programs that run on
9836 Windows XP][xp], though XP is not considered a supported platform.
9837 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9838 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9839 recommended for use in 1.3, though should be fully-functional
9840 in the [64-bit 1.4 beta][b14].
9841 * On Fedora-based systems installation will [properly configure the
9842 dynamic linker][fl].
9843 * The compiler gained many new extended error descriptions, which can
9844 be accessed with the `--explain` flag.
9845 * The `dropck` pass, which checks that destructors can't access
9846 destroyed values, [has been rewritten][27261]. This fixes some
9847 soundness holes, and as such will cause some previously-compiling
9848 code to no longer build.
9849 * `rustc` now uses [LLVM to write archive files where possible][ar].
9850 Eventually this will eliminate the compiler's dependency on the ar
9852 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9853 supported FreeBSD on x86_64).
9854 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9855 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9857 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9858 will kill the process instead of leaking][nlp].
9860 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9861 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9862 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9863 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9864 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9865 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9866 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9867 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9868 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9869 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9870 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9871 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9872 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9873 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9874 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9875 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9876 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9877 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9878 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9879 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9880 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9881 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9882 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9883 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9884 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9885 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9886 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9887 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9888 [ar]: https://github.com/rust-lang/rust/pull/26926
9889 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9890 [dms]: https://github.com/rust-lang/rust/pull/26241
9891 [27261]: https://github.com/rust-lang/rust/pull/27261
9892 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9893 [ds]: https://github.com/rust-lang/rust/pull/26818
9894 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9895 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9896 [dst3]: https://github.com/rust-lang/rust/pull/27351
9897 [e]: https://github.com/rust-lang/rust/pull/24793
9898 [f]: https://github.com/rust-lang/rust/pull/26588
9899 [26959]: https://github.com/rust-lang/rust/pull/26959
9900 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9901 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9902 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9903 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9904 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9905 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9906 [lic]: https://github.com/rust-lang/rust/pull/26583
9907 [lnu]: https://github.com/rust-lang/rust/pull/27026
9908 [lr]: https://github.com/rust-lang/rust/issues/27248
9909 [lum]: https://github.com/rust-lang/rust/pull/26378
9910 [lur]: https://github.com/rust-lang/rust/pull/26783
9911 [nlp]: https://github.com/rust-lang/rust/pull/27176
9912 [nold2]: https://github.com/rust-lang/rust/pull/27045
9913 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9914 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9915 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9916 [pi]: https://github.com/rust-lang/rust/pull/26699
9917 [ps]: https://github.com/rust-lang/rust/pull/26884
9918 [rte]: https://github.com/rust-lang/rust/pull/26950
9919 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9920 [search]: https://github.com/rust-lang/rust/pull/26327
9921 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9922 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9923 [sh]: https://github.com/rust-lang/rust/pull/27280
9924 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9925 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9926 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9927 [st]: https://github.com/rust-lang/rust/pull/26630
9928 [win1]: https://github.com/rust-lang/rust/pull/26569
9929 [win2]: https://github.com/rust-lang/rust/pull/26741
9930 [win3]: https://github.com/rust-lang/rust/pull/26741
9931 [win4]: https://github.com/rust-lang/rust/pull/27210
9932 [xp]: https://github.com/rust-lang/rust/pull/26569
9934 Version 1.2.0 (2015-08-07)
9935 ==========================
9937 * ~1200 changes, numerous bugfixes
9942 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9943 like `Rc` to contain types without a fixed size, arrays and trait
9944 objects, finally enabling use of `Rc<[T]>` and completing the
9945 implementation of DST.
9946 * [Parallel codegen][parcodegen] is now working again, which can
9947 substantially speed up large builds in debug mode; It also gets
9948 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9949 jobs). It's not enabled by default, but will be "in the near
9950 future". It can be activated with the `-C codegen-units=N` flag to
9952 * This is the first release with [experimental support for linking
9953 with the MSVC linker and lib C on Windows (instead of using the GNU
9954 variants via MinGW)][win]. It is yet recommended only for the most
9955 intrepid Rustaceans.
9956 * Benchmark compilations are showing a 30% improvement in
9957 bootstrapping over 1.1.
9962 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9963 unicode case mapping, which is a previously-planned change in
9964 behavior and considered a bugfix.
9965 * [`mem::align_of`] now specifies [the *minimum alignment* for
9966 T][align], which is usually the alignment programs are interested
9967 in, and the same value reported by clang's
9968 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9970 * [The `#[packed]` attribute is no longer silently accepted by the
9971 compiler][packed]. This attribute did nothing and code that
9972 mentioned it likely did not work as intended.
9973 * Associated type defaults are [now behind the
9974 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9975 defaults *did not work*, but could be mentioned syntactically. As
9976 such this breakage has minimal impact.
9981 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9982 matching against dereferenceable values.
9987 * The [`Extend`] trait, which grows a collection from an iterator, is
9988 implemented over iterators of references, for `String`, `Vec`,
9989 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9990 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9991 * The [`iter::once`] function returns an iterator that yields a single
9992 element, and [`iter::empty`] returns an iterator that yields no
9994 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9995 over substring matches.
9996 * [`Cell`] and [`RefCell`] both implement `Eq`.
9997 * A number of methods for wrapping arithmetic are added to the
9998 integral types, [`wrapping_div`], [`wrapping_rem`],
9999 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10000 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10001 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10002 type.. It is illegal for the default arithmetic operations in Rust
10003 to overflow; the desire to wrap must be explicit.
10004 * The `{:#?}` formatting specifier [displays the alternate,
10005 pretty-printed][debugfmt] form of the `Debug` formatter. This
10006 feature was actually introduced prior to 1.0 with little
10008 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10009 for writing data to formatted strings, similar to [`io::Write`].
10010 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10011 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10012 are used by code generators to emit implementations of [`Debug`].
10013 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10014 methods that convert case, following Unicode case mapping.
10015 * It is now easier to handle poisoned locks. The [`PoisonError`]
10016 type, returned by failing lock operations, exposes `into_inner`,
10017 `get_ref`, and `get_mut`, which all give access to the inner lock
10018 guard, and allow the poisoned lock to continue to operate. The
10019 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10020 poisoned lock without attempting to take the lock.
10021 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10022 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10023 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10024 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10026 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10032 * `rustc` employs smarter heuristics for guessing at [typos].
10033 * `rustc` emits more efficient code for [no-op conversions between
10034 unsafe pointers][nop].
10035 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10036 resulting in faster compile times and smaller code.
10038 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10039 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10040 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10041 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10042 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10043 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10044 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10045 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10046 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10047 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10048 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10049 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10050 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10051 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10052 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10053 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10054 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10055 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10056 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10057 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10058 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10059 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10060 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10061 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10062 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10063 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10064 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10065 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10066 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10067 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10068 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10069 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10070 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10071 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10072 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10073 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10074 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10075 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10076 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10077 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10078 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10079 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10080 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10081 [align]: https://github.com/rust-lang/rust/pull/25646
10082 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10083 [typos]: https://github.com/rust-lang/rust/pull/26087
10084 [nop]: https://github.com/rust-lang/rust/pull/26336
10085 [fat]: https://github.com/rust-lang/rust/pull/26411
10086 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10087 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10088 [packed]: https://github.com/rust-lang/rust/pull/25541
10089 [ad]: https://github.com/rust-lang/rust/pull/27382
10090 [win]: https://github.com/rust-lang/rust/pull/25350
10092 Version 1.1.0 (2015-06-25)
10093 =========================
10095 * ~850 changes, numerous bugfixes
10100 * The [`std::fs` module has been expanded][fs] to expand the set of
10101 functionality exposed:
10102 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10103 don't incur a syscall on some platforms.
10104 * A `symlink_metadata` function has been added.
10105 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10106 access to all underlying information.
10107 * The compiler now contains extended explanations of many errors. When an error
10108 with an explanation occurs the compiler suggests using the `--explain` flag
10109 to read the explanation. Error explanations are also [available online][err-index].
10110 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10111 well as other work, the time to bootstrap the compiler decreased by
10117 * The [`str::split_whitespace`] method splits a string on unicode
10118 whitespace boundaries.
10119 * On both Windows and Unix, new extension traits provide conversion of
10120 I/O types to and from the underlying system handles. On Unix, these
10121 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10122 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10123 `TcpListener`, and `UpdSocket`. Further implementations for
10124 `std::process` will be stabilized later.
10125 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10126 Windows, symlinks can be created with
10127 `std::os::windows::symlink_dir` and
10128 `std::os::windows::symlink_file`.
10129 * The `mpsc::Receiver` type can now be converted into an iterator with
10130 `into_iter` on the [`IntoIterator`] trait.
10131 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10132 implementation of the [`From`] trait.
10133 * The `Debug` implementation for `RangeFull` [creates output that is
10134 more consistent with other implementations][rf].
10135 * [`Debug` is implemented for `File`][file].
10136 * The `Default` implementation for `Arc` [no longer requires `Sync +
10138 * [The `Iterator` methods `count`, `nth`, and `last` have been
10139 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10140 * Incorrect handling of paths on Windows has been improved in both the
10141 compiler and the standard library.
10142 * [`AtomicPtr` gained a `Default` implementation][ap].
10143 * In accordance with Rust's policy on arithmetic overflow `abs` now
10144 [panics on overflow when debug assertions are enabled][abs].
10145 * The [`Cloned`] iterator, which was accidentally left unstable for
10146 1.0 [has been stabilized][c].
10147 * The [`Incoming`] iterator, which iterates over incoming TCP
10148 connections, and which was accidentally unnamable in 1.0, [is now
10149 properly exported][inc].
10150 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10151 `sift_up` or `sift_down` panic][bh].
10152 * The [`split_off`] method of `LinkedList` [no longer corrupts
10153 the list in certain scenarios][ll].
10158 * Type checking performance [has improved notably][sk] with
10159 [multiple improvements][pre].
10160 * The compiler [suggests code changes][ch] for more errors.
10161 * rustc and it's build system have experimental support for [building
10162 toolchains against MUSL][m] instead of glibc on Linux.
10163 * The compiler defines the `target_env` cfg value, which is used for
10164 distinguishing toolchains that are otherwise for the same
10165 platform. Presently this is set to `gnu` for common GNU Linux
10166 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10167 * The [`cargo rustc`][crc] command invokes a build with custom flags
10169 * [Android executables are always position independent][pie].
10170 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10171 with `Drop`][24935].
10173 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10174 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10175 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10176 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10177 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10178 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10179 [rf]: https://github.com/rust-lang/rust/pull/24491
10180 [err-index]: https://doc.rust-lang.org/error-index.html
10181 [sk]: https://github.com/rust-lang/rust/pull/24615
10182 [pre]: https://github.com/rust-lang/rust/pull/25323
10183 [file]: https://github.com/rust-lang/rust/pull/24598
10184 [ch]: https://github.com/rust-lang/rust/pull/24683
10185 [arc]: https://github.com/rust-lang/rust/pull/24695
10186 [si]: https://github.com/rust-lang/rust/pull/24701
10187 [ap]: https://github.com/rust-lang/rust/pull/24834
10188 [m]: https://github.com/rust-lang/rust/pull/24777
10189 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10190 [crc]: https://github.com/rust-lang/cargo/pull/1568
10191 [pie]: https://github.com/rust-lang/rust/pull/24953
10192 [abs]: https://github.com/rust-lang/rust/pull/25441
10193 [c]: https://github.com/rust-lang/rust/pull/25496
10194 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10195 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10196 [inc]: https://github.com/rust-lang/rust/pull/25522
10197 [bh]: https://github.com/rust-lang/rust/pull/25856
10198 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10199 [ll]: https://github.com/rust-lang/rust/pull/26022
10200 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10201 [24935]: https://github.com/rust-lang/rust/pull/24935
10203 Version 1.0.0 (2015-05-15)
10204 ========================
10206 * ~1500 changes, numerous bugfixes
10211 * The vast majority of the standard library is now `#[stable]`. It is
10212 no longer possible to use unstable features with a stable build of
10214 * Many popular crates on [crates.io] now work on the stable release
10216 * Arithmetic on basic integer types now [checks for overflow in debug
10222 * Several [restrictions have been added to trait coherence][coh] in
10223 order to make it easier for upstream authors to change traits
10224 without breaking downstream code.
10225 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10226 improve error messages and macro behavior. For example, `0b1234` is
10227 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10228 * Trait bounds [are always invariant][inv], eliminating the need for
10229 the `PhantomFn` and `MarkerTrait` lang items, which have been
10231 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10232 "foo" as bar` syntax has been replaced with `extern crate foo as
10233 bar`, and Cargo now automatically translates "-" in *package* names
10234 to underscore for the crate name.
10235 * [Lifetime shadowing is an error][lt].
10236 * [`Send` no longer implies `'static`][send-rfc].
10237 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10238 `MyType::default()`.
10239 * Primitive types [now have inherent methods][prim-inherent],
10240 obviating the need for extension traits like `SliceExt`.
10241 * Methods with `Self: Sized` in their `where` clause are [considered
10242 object-safe][self-sized], allowing many extension traits like
10243 `IteratorExt` to be merged into the traits they extended.
10244 * You can now [refer to associated types][assoc-where] whose
10245 corresponding trait bounds appear only in a `where` clause.
10246 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10247 like `Send` and `Sync` are now library-defined.
10248 * A [Reflect trait][reflect] was introduced, which means that
10249 downcasting via the `Any` trait is effectively limited to concrete
10250 types. This helps retain the potentially-important "parametricity"
10251 property: generic code cannot behave differently for different type
10252 arguments except in minor ways.
10253 * The `unsafe_destructor` feature is now deprecated in favor of the
10254 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10260 * The `thread_local` module [has been renamed to `std::thread`][th].
10261 * The methods of `IteratorExt` [have been moved to the `Iterator`
10262 trait itself][23300].
10263 * Several traits that implement Rust's conventions for type
10264 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10265 [centralized in the `std::convert` module][con].
10266 * The `FromError` trait [was removed in favor of `From`][fe].
10267 * The basic sleep function [has moved to
10268 `std::thread::sleep_ms`][slp].
10269 * The `splitn` function now takes an `n` parameter that represents the
10270 number of items yielded by the returned iterator [instead of the
10271 number of 'splits'][spl].
10272 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10273 * [Derived implementations of `PartialOrd` now order enums according
10274 to their explicitly-assigned discriminants][po].
10275 * [Methods for searching strings are generic over `Pattern`s][pat],
10276 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10278 * [In method resolution, object methods are resolved before inherent
10280 * [`String::from_str` has been deprecated in favor of the `From` impl,
10281 `String::from`][24517].
10282 * [`io::Error` implements `Sync`][ios].
10283 * [The `words` method on `&str` has been replaced with
10284 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10286 * The new path and IO modules are complete and `#[stable]`. This
10287 was the major library focus for this cycle.
10288 * The path API was [revised][path-normalize] to normalize `.`,
10289 adjusting the tradeoffs in favor of the most common usage.
10290 * A large number of remaining APIs in `std` were also stabilized
10291 during this cycle; about 75% of the non-deprecated API surface
10293 * The new [string pattern API][string-pattern] landed, which makes
10294 the string slice API much more internally consistent and flexible.
10295 * A new set of [generic conversion traits][conversion] replaced
10296 many existing ad hoc traits.
10297 * Generic numeric traits were [completely removed][num-traits]. This
10298 was made possible thanks to inherent methods for primitive types,
10299 and the removal gives maximal flexibility for designing a numeric
10300 hierarchy in the future.
10301 * The `Fn` traits are now related via [inheritance][fn-inherit]
10302 and provide ergonomic [blanket implementations][fn-blanket].
10303 * The `Index` and `IndexMut` traits were changed to
10304 [take the index by value][index-value], enabling code like
10305 `hash_map["string"]` to work.
10306 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10307 `Copy` data is known to be `Clone` as well.
10312 * Many errors now have extended explanations that can be accessed with
10313 the `--explain` flag to `rustc`.
10314 * Many new examples have been added to the standard library
10316 * rustdoc has received a number of improvements focused on completion
10318 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10319 * Much headway was made on ecosystem-wide CI, making it possible
10320 to [compare builds for breakage][ci-compare].
10323 [crates.io]: http://crates.io
10324 [clo]: https://github.com/rust-lang/rust/pull/24034
10325 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10326 [con]: https://github.com/rust-lang/rust/pull/23875
10327 [cr]: https://github.com/rust-lang/rust/pull/23419
10328 [fe]: https://github.com/rust-lang/rust/pull/23879
10329 [23300]: https://github.com/rust-lang/rust/pull/23300
10330 [inv]: https://github.com/rust-lang/rust/pull/23938
10331 [ios]: https://github.com/rust-lang/rust/pull/24133
10332 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10333 [lt]: https://github.com/rust-lang/rust/pull/24057
10334 [meth]: https://github.com/rust-lang/rust/pull/24056
10335 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10336 [po]: https://github.com/rust-lang/rust/pull/24270
10337 [24517]: https://github.com/rust-lang/rust/pull/24517
10338 [slp]: https://github.com/rust-lang/rust/pull/23949
10339 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10340 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10341 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10342 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10343 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10344 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10345 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10346 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10347 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10348 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10349 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10350 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10351 [reflect]: https://github.com/rust-lang/rust/pull/23712
10352 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10353 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10354 [index-value]: https://github.com/rust-lang/rust/pull/23601
10355 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10356 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10357 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10358 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10359 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10360 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10363 Version 1.0.0-alpha.2 (2015-02-20)
10364 =====================================
10366 * ~1300 changes, numerous bugfixes
10370 * The various I/O modules were [overhauled][io-rfc] to reduce
10371 unnecessary abstractions and provide better interoperation with
10372 the underlying platform. The old `io` module remains temporarily
10374 * The standard library now [participates in feature gating][feat],
10375 so use of unstable libraries now requires a `#![feature(...)]`
10376 attribute. The impact of this change is [described on the
10377 forum][feat-forum]. [RFC][feat-rfc].
10381 * `for` loops [now operate on the `IntoIterator` trait][into],
10382 which eliminates the need to call `.iter()`, etc. to iterate
10383 over collections. There are some new subtleties to remember
10384 though regarding what sort of iterators various types yield, in
10385 particular that `for foo in bar { }` yields values from a move
10386 iterator, destroying the original collection. [RFC][into-rfc].
10387 * Objects now have [default lifetime bounds][obj], so you don't
10388 have to write `Box<Trait+'static>` when you don't care about
10389 storing references. [RFC][obj-rfc].
10390 * In types that implement `Drop`, [lifetimes must outlive the
10391 value][drop]. This will soon make it possible to safely
10392 implement `Drop` for types where `#[unsafe_destructor]` is now
10393 required. Read the [gorgeous RFC][drop-rfc] for details.
10394 * The fully qualified <T as Trait>::X syntax lets you set the Self
10395 type for a trait method or associated type. [RFC][ufcs-rfc].
10396 * References to types that implement `Deref<U>` now [automatically
10397 coerce to references][deref] to the dereferenced type `U`,
10398 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10399 should eliminate many unsightly uses of `&*`, as when converting
10400 from references to vectors into references to
10401 slices. [RFC][deref-rfc].
10402 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10403 `|:|`) is obsolete and closure kind is inferred from context.
10404 * [`Self` is a keyword][Self].
10408 * The `Show` and `String` formatting traits [have been
10409 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10410 their related purposes. Automatically getting a string
10411 conversion to use with `format!("{:?}", something_to_debug)` is
10412 now written `#[derive(Debug)]`.
10413 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10414 OsStr}`, provide strings in platform-specific encodings for easier
10415 interop with system APIs. [RFC][osstr-rfc].
10416 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10417 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10418 creating raw pointers.
10422 * Certain long error messages of the form 'expected foo found bar'
10423 are now [split neatly across multiple
10424 lines][multiline]. Examples in the PR.
10425 * On Unix Rust can be [uninstalled][un] by running
10426 `/usr/local/lib/rustlib/uninstall.sh`.
10427 * The `#[rustc_on_unimplemented]` attribute, requiring the
10428 'on_unimplemented' feature, lets rustc [display custom error
10429 messages when a trait is expected to be implemented for a type
10434 * Rust is tested against a [LALR grammar][lalr], which parses
10435 almost all the Rust files that rustc does.
10437 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10438 [close]: https://github.com/rust-lang/rust/pull/21843
10439 [deref]: https://github.com/rust-lang/rust/pull/21351
10440 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10441 [drop]: https://github.com/rust-lang/rust/pull/21972
10442 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10443 [feat]: https://github.com/rust-lang/rust/pull/21248
10444 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10445 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10446 [fmt]: https://github.com/rust-lang/rust/pull/21457
10447 [into]: https://github.com/rust-lang/rust/pull/20790
10448 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10449 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10450 [lalr]: https://github.com/rust-lang/rust/pull/21452
10451 [multiline]: https://github.com/rust-lang/rust/pull/19870
10452 [obj]: https://github.com/rust-lang/rust/pull/22230
10453 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10454 [onun]: https://github.com/rust-lang/rust/pull/20889
10455 [osstr]: https://github.com/rust-lang/rust/pull/21488
10456 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10457 [Self]: https://github.com/rust-lang/rust/pull/22158
10458 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10459 [un]: https://github.com/rust-lang/rust/pull/22256
10462 Version 1.0.0-alpha (2015-01-09)
10463 ==================================
10465 * ~2400 changes, numerous bugfixes
10469 * The language itself is considered feature complete for 1.0,
10470 though there will be many usability improvements and bugfixes
10471 before the final release.
10472 * Nearly 50% of the public API surface of the standard library has
10473 been declared 'stable'. Those interfaces are unlikely to change
10475 * The long-running debate over integer types has been
10476 [settled][ints]: Rust will ship with types named `isize` and
10477 `usize`, rather than `int` and `uint`, for pointer-sized
10478 integers. Guidelines will be rolled out during the alpha cycle.
10479 * Most crates that are not `std` have been moved out of the Rust
10480 distribution into the Cargo ecosystem so they can evolve
10481 separately and don't need to be stabilized as quickly, including
10482 'time', 'getopts', 'num', 'regex', and 'term'.
10483 * Documentation continues to be expanded with more API coverage, more
10484 examples, and more in-depth explanations. The guides have been
10485 consolidated into [The Rust Programming Language][trpl].
10486 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10487 * All official Rust binary installers now come with [Cargo], the
10488 Rust package manager.
10492 * Closures have been [completely redesigned][unboxed] to be
10493 implemented in terms of traits, can now be used as generic type
10494 bounds and thus monomorphized and inlined, or via an opaque
10495 pointer (boxed) as in the old system. The new system is often
10496 referred to as 'unboxed' closures.
10497 * Traits now support [associated types][assoc], allowing families
10498 of related types to be defined together and used generically in
10500 * Enum variants are [namespaced by their type names][enum].
10501 * [`where` clauses][where] provide a more versatile and attractive
10502 syntax for specifying generic bounds, though the previous syntax
10504 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10506 * Rust [no longer has a runtime][rt] of any description, and only
10507 supports OS threads, not green threads.
10508 * At long last, Rust has been overhauled for 'dynamically-sized
10509 types' ([DST]), which integrates 'fat pointers' (object types,
10510 arrays, and `str`) more deeply into the type system, making it
10512 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10513 `..j` that produce range types and which, when combined with the
10514 `Index` operator and multidispatch, leads to a convenient slice
10515 notation, `[i..j]`.
10516 * The new range syntax revealed an ambiguity in the fixed-length
10517 array syntax, so now fixed length arrays [are written `[T;
10519 * The `Copy` trait is no longer implemented automatically. Unsafe
10520 pointers no longer implement `Sync` and `Send` so types
10521 containing them don't automatically either. `Sync` and `Send`
10522 are now 'unsafe traits' so one can "forcibly" implement them via
10523 `unsafe impl` if a type confirms to the requirements for them
10524 even though the internals do not (e.g. structs containing unsafe
10525 pointers like `Arc`). These changes are intended to prevent some
10526 footguns and are collectively known as [opt-in built-in
10527 traits][oibit] (though `Sync` and `Send` will soon become pure
10528 library types unknown to the compiler).
10529 * Operator traits now take their operands [by value][ops], and
10530 comparison traits can use multidispatch to compare one type
10531 against multiple other types, allowing e.g. `String` to be
10532 compared with `&str`.
10533 * `if let` and `while let` are no longer feature-gated.
10534 * Rust has adopted a more [uniform syntax for escaping unicode
10535 characters][unicode].
10536 * `macro_rules!` [has been declared stable][mac]. Though it is a
10537 flawed system it is sufficiently popular that it must be usable
10538 for 1.0. Effort has gone into [future-proofing][mac-future] it
10539 in ways that will allow other macro systems to be developed in
10540 parallel, and won't otherwise impact the evolution of the
10542 * The prelude has been [pared back significantly][prelude] such
10543 that it is the minimum necessary to support the most pervasive
10544 code patterns, and through [generalized where clauses][where]
10545 many of the prelude extension traits have been consolidated.
10546 * Rust's rudimentary reflection [has been removed][refl], as it
10547 incurred too much code generation for little benefit.
10548 * [Struct variants][structvars] are no longer feature-gated.
10549 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10550 known as 'higher-ranked trait bounds', this crucially allows
10551 unboxed closures to work.
10552 * Macros invocations surrounded by parens or square brackets and
10553 not terminated by a semicolon are [parsed as
10554 expressions][macros], which makes expressions like `vec![1i32,
10555 2, 3].len()` work as expected.
10556 * Trait objects now implement their traits automatically, and
10557 traits that can be coerced to objects now must be [object
10559 * Automatically deriving traits is now done with `#[derive(...)]`
10560 not `#[deriving(...)]` for [consistency with other naming
10561 conventions][derive].
10562 * Importing the containing module or enum at the same time as
10563 items or variants they contain is [now done with `self` instead
10564 of `mod`][self], as in use `foo::{self, bar}`
10565 * Glob imports are no longer feature-gated.
10566 * The `box` operator and `box` patterns have been feature-gated
10567 pending a redesign. For now unique boxes should be allocated
10568 like other containers, with `Box::new`.
10572 * A [series][coll1] of [efforts][coll2] to establish
10573 [conventions][coll3] for collections types has resulted in API
10574 improvements throughout the standard library.
10575 * New [APIs for error handling][err] provide ergonomic interop
10576 between error types, and [new conventions][err-conv] describe
10577 more clearly the recommended error handling strategies in Rust.
10578 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10579 it is easier to discuss failure in the context of error handling
10580 without making clarifications as to whether you are referring to
10581 the 'fail' macro or failure more generally.
10582 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10583 syscall when available.
10584 * The 'serialize' crate has been renamed 'rustc-serialize' and
10585 moved out of the distribution to Cargo. Although it is widely
10586 used now, it is expected to be superseded in the near future.
10587 * The `Show` formatter, typically implemented with
10588 `#[derive(Show)]` is [now requested with the `{:?}`
10589 specifier][show] and is intended for use by all types, for uses
10590 such as `println!` debugging. The new `String` formatter must be
10591 implemented by hand, uses the `{}` specifier, and is intended
10592 for full-fidelity conversions of things that can logically be
10593 represented as strings.
10597 * [Flexible target specification][flex] allows rustc's code
10598 generation to be configured to support otherwise-unsupported
10600 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10601 respective debuggers with Rust-appropriate pretty-printing.
10602 * The Windows installation of Rust is distributed with the
10603 MinGW components currently required to link binaries on that
10608 * Nullable enum optimizations have been extended to more types so
10609 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10610 space than the inner types themselves.
10611 * Work has begun on supporting AArch64.
10613 [Cargo]: https://crates.io
10614 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10615 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10616 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10617 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10618 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10619 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10620 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10621 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10622 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10623 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10624 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10625 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10626 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10627 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10628 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10629 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10630 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10631 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10632 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10633 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10634 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10635 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10636 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10637 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10638 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10639 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10640 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10641 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10642 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10643 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10644 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10645 [trpl]: https://doc.rust-lang.org/book/index.html
10646 [rbe]: http://rustbyexample.com/
10649 Version 0.12.0 (2014-10-09)
10650 =============================
10652 * ~1900 changes, numerous bugfixes
10656 * The introductory documentation (now called The Rust Guide) has
10657 been completely rewritten, as have a number of supplementary
10659 * Rust's package manager, Cargo, continues to improve and is
10660 sometimes considered to be quite awesome.
10661 * Many API's in `std` have been reviewed and updated for
10662 consistency with the in-development Rust coding
10663 guidelines. The standard library documentation tracks
10664 stabilization progress.
10665 * Minor libraries have been moved out-of-tree to the rust-lang org
10666 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10667 be installed with Cargo.
10668 * Lifetime elision allows lifetime annotations to be left off of
10669 function declarations in many common scenarios.
10670 * Rust now works on 64-bit Windows.
10673 * Indexing can be overloaded with the `Index` and `IndexMut`
10675 * The `if let` construct takes a branch only if the `let` pattern
10676 matches, currently behind the 'if_let' feature gate.
10677 * 'where clauses', a more flexible syntax for specifying trait
10678 bounds that is more aesthetic, have been added for traits and
10679 free functions. Where clauses will in the future make it
10680 possible to constrain associated types, which would be
10681 impossible with the existing syntax.
10682 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10683 the 'slicing_syntax' feature gate, and can be overloaded with
10684 the `Slice` or `SliceMut` traits.
10685 * The syntax for matching of sub-slices has been changed to use a
10686 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10687 consistency with other uses of `..` and to future-proof
10688 potential additional uses of the syntax.
10689 * The syntax for matching inclusive ranges in patterns has changed
10690 from `0..3` to `0...4` to be consistent with the exclusive range
10691 syntax for slicing.
10692 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10693 c]`) has been put behind the 'advanced_slice_patterns' feature
10694 gate and may be removed in the future.
10695 * Components of tuples and tuple structs can be extracted using
10696 the `value.0` syntax, currently behind the `tuple_indexing`
10698 * The `#[crate_id]` attribute is no longer supported; versioning
10699 is handled by the package manager.
10700 * Renaming crate imports are now written `extern crate foo as bar`
10701 instead of `extern crate bar = foo`.
10702 * Renaming use statements are now written `use foo as bar` instead
10703 of `use bar = foo`.
10704 * `let` and `match` bindings and argument names in macros are now
10706 * The new, more efficient, closure types ('unboxed closures') have
10707 been added under a feature gate, 'unboxed_closures'. These will
10708 soon replace the existing closure types, once higher-ranked
10709 trait lifetimes are added to the language.
10710 * `move` has been added as a keyword, for indicating closures
10711 that capture by value.
10712 * Mutation and assignment is no longer allowed in pattern guards.
10713 * Generic structs and enums can now have trait bounds.
10714 * The `Share` trait is now called `Sync` to free up the term
10715 'shared' to refer to 'shared reference' (the default reference
10717 * Dynamically-sized types have been mostly implemented,
10718 unifying the behavior of fat-pointer types with the rest of the
10720 * As part of dynamically-sized types, the `Sized` trait has been
10721 introduced, which qualifying types implement by default, and
10722 which type parameters expect by default. To specify that a type
10723 parameter does not need to be sized, write `<Sized? T>`. Most
10724 types are `Sized`, notable exceptions being unsized arrays
10725 (`[T]`) and trait types.
10726 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10727 * Lifetime bounds can now be applied to type parameters and object
10729 * The old, reference counted GC type, `Gc<T>` which was once
10730 denoted by the `@` sigil, has finally been removed. GC will be
10731 revisited in the future.
10734 * Library documentation has been improved for a number of modules.
10735 * Bit-vectors, collections::bitv has been modernized.
10736 * The url crate is deprecated in favor of
10737 http://github.com/servo/rust-url, which can be installed with
10739 * Most I/O stream types can be cloned and subsequently closed from
10740 a different thread.
10741 * A `std::time::Duration` type has been added for use in I/O
10742 methods that rely on timers, as well as in the 'time' crate's
10743 `Timespec` arithmetic.
10744 * The runtime I/O abstraction layer that enabled the green thread
10745 scheduler to do non-thread-blocking I/O has been removed, along
10746 with the libuv-based implementation employed by the green thread
10747 scheduler. This will greatly simplify the future I/O work.
10748 * `collections::btree` has been rewritten to have a more
10749 idiomatic and efficient design.
10752 * rustdoc output now indicates the stability levels of API's.
10753 * The `--crate-name` flag can specify the name of the crate
10754 being compiled, like `#[crate_name]`.
10755 * The `-C metadata` specifies additional metadata to hash into
10756 symbol names, and `-C extra-filename` specifies additional
10757 information to put into the output filename, for use by the
10758 package manager for versioning.
10759 * debug info generation has continued to improve and should be
10760 more reliable under both gdb and lldb.
10761 * rustc has experimental support for compiling in parallel
10762 using the `-C codegen-units` flag.
10763 * rustc no longer encodes rpath information into binaries by
10767 * Stack usage has been optimized with LLVM lifetime annotations.
10768 * Official Rust binaries on Linux are more compatible with older
10769 kernels and distributions, built on CentOS 5.10.
10772 Version 0.11.0 (2014-07-02)
10773 ==========================
10775 * ~1700 changes, numerous bugfixes
10778 * ~[T] has been removed from the language. This type is superseded by
10780 * ~str has been removed from the language. This type is superseded by
10782 * ~T has been removed from the language. This type is superseded by the
10784 * @T has been removed from the language. This type is superseded by the
10785 standard library's std::gc::Gc<T> type.
10786 * Struct fields are now all private by default.
10787 * Vector indices and shift amounts are both required to be a `uint`
10788 instead of any integral type.
10789 * Byte character, byte string, and raw byte string literals are now all
10790 supported by prefixing the normal literal with a `b`.
10791 * Multiple ABIs are no longer allowed in an ABI string
10792 * The syntax for lifetimes on closures/procedures has been tweaked
10793 slightly: `<'a>|A, B|: 'b + K -> T`
10794 * Floating point modulus has been removed from the language; however it
10795 is still provided by a library implementation.
10796 * Private enum variants are now disallowed.
10797 * The `priv` keyword has been removed from the language.
10798 * A closure can no longer be invoked through a &-pointer.
10799 * The `use foo, bar, baz;` syntax has been removed from the language.
10800 * The transmute intrinsic no longer works on type parameters.
10801 * Statics now allow blocks/items in their definition.
10802 * Trait bounds are separated from objects with + instead of : now.
10803 * Objects can no longer be read while they are mutably borrowed.
10804 * The address of a static is now marked as insignificant unless the
10805 #[inline(never)] attribute is placed it.
10806 * The #[unsafe_destructor] attribute is now behind a feature gate.
10807 * Struct literals are no longer allowed in ambiguous positions such as
10808 if, while, match, and for..in.
10809 * Declaration of lang items and intrinsics are now feature-gated by
10811 * Integral literals no longer default to `int`, and floating point
10812 literals no longer default to `f64`. Literals must be suffixed with an
10813 appropriate type if inference cannot determine the type of the
10815 * The Box<T> type is no longer implicitly borrowed to &mut T.
10816 * Procedures are now required to not capture borrowed references.
10819 * The standard library is now a "facade" over a number of underlying
10820 libraries. This means that development on the standard library should
10821 be speedier due to smaller crates, as well as a clearer line between
10823 * A new library, libcore, lives under the standard library's facade
10824 which is Rust's "0-assumption" library, suitable for embedded and
10825 kernel development for example.
10826 * A regex crate has been added to the standard distribution. This crate
10827 includes statically compiled regular expressions.
10828 * The unwrap/unwrap_err methods on Result require a Show bound for
10829 better error messages.
10830 * The return types of the std::comm primitives have been centralized
10831 around the Result type.
10832 * A number of I/O primitives have gained the ability to time out their
10834 * A number of I/O primitives have gained the ability to close their
10835 reading/writing halves to cancel pending operations.
10836 * Reverse iterator methods have been removed in favor of `rev()` on
10837 their forward-iteration counterparts.
10838 * A bitflags! macro has been added to enable easy interop with C and
10839 management of bit flags.
10840 * A debug_assert! macro is now provided which is disabled when
10841 `--cfg ndebug` is passed to the compiler.
10842 * A graphviz crate has been added for creating .dot files.
10843 * The std::cast module has been migrated into std::mem.
10844 * The std::local_data api has been migrated from freestanding functions
10845 to being based on methods.
10846 * The Pod trait has been renamed to Copy.
10847 * jemalloc has been added as the default allocator for types.
10848 * The API for allocating memory has been changed to use proper alignment
10849 and sized deallocation
10850 * Connecting a TcpStream or binding a TcpListener is now based on a
10851 string address and a u16 port. This allows connecting to a hostname as
10853 * The Reader trait now contains a core method, read_at_least(), which
10854 correctly handles many repeated 0-length reads.
10855 * The process-spawning API is now centered around a builder-style
10857 * The :? printing qualifier has been moved from the standard library to
10858 an external libdebug crate.
10859 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10860 have been renamed to Eq/Ord.
10861 * The select/plural methods have been removed from format!. The escapes
10862 for { and } have also changed from \{ and \} to {{ and }},
10864 * The TaskBuilder API has been re-worked to be a true builder, and
10865 extension traits for spawning native/green tasks have been added.
10868 * All breaking changes to the language or libraries now have their
10869 commit message annotated with `[breaking-change]` to allow for easy
10870 discovery of breaking changes.
10871 * The compiler will now try to suggest how to annotate lifetimes if a
10872 lifetime-related error occurs.
10873 * Debug info continues to be improved greatly with general bug fixes and
10874 better support for situations like link time optimization (LTO).
10875 * Usage of syntax extensions when cross-compiling has been fixed.
10876 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10877 -fdata-sections and --gc-sections has been enabled by default
10878 * The compiler is now stricter about where it will load module files
10879 from when a module is declared via `mod foo;`.
10880 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10881 Syntax extensions are now discovered via a "plugin registrar" type
10882 which will be extended in the future to other various plugins.
10883 * Lints have been restructured to allow for dynamically loadable lints.
10884 * A number of rustdoc improvements:
10885 * The HTML output has been visually redesigned.
10886 * Markdown is now powered by hoedown instead of sundown.
10887 * Searching heuristics have been greatly improved.
10888 * The search index has been reduced in size by a great amount.
10889 * Cross-crate documentation via `pub use` has been greatly improved.
10890 * Primitive types are now hyperlinked and documented.
10891 * Documentation has been moved from static.rust-lang.org/doc to
10893 * A new sandbox, play.rust-lang.org, is available for running and
10894 sharing rust code examples on-line.
10895 * Unused attributes are now more robustly warned about.
10896 * The dead_code lint now warns about unused struct fields.
10897 * Cross-compiling to iOS is now supported.
10898 * Cross-compiling to mipsel is now supported.
10899 * Stability attributes are now inherited by default and no longer apply
10900 to intra-crate usage, only inter-crate usage.
10901 * Error message related to non-exhaustive match expressions have been
10905 Version 0.10 (2014-04-03)
10906 =========================
10908 * ~1500 changes, numerous bugfixes
10911 * A new RFC process is now in place for modifying the language.
10912 * Patterns with `@`-pointers have been removed from the language.
10913 * Patterns with unique vectors (`~[T]`) have been removed from the
10915 * Patterns with unique strings (`~str`) have been removed from the
10917 * `@str` has been removed from the language.
10918 * `@[T]` has been removed from the language.
10919 * `@self` has been removed from the language.
10920 * `@Trait` has been removed from the language.
10921 * Headers on `~` allocations which contain `@` boxes inside the type for
10922 reference counting have been removed.
10923 * The semantics around the lifetimes of temporary expressions have changed,
10924 see #3511 and #11585 for more information.
10925 * Cross-crate syntax extensions are now possible, but feature gated. See
10926 #11151 for more information. This includes both `macro_rules!` macros as
10927 well as syntax extensions such as `format!`.
10928 * New lint modes have been added, and older ones have been turned on to be
10930 * Unnecessary parentheses
10931 * Uppercase statics
10933 * Uppercase variables
10934 * Publicly visible private types
10935 * `#[deriving]` with raw pointers
10936 * Unsafe functions can no longer be coerced to closures.
10937 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10938 * The `#[simd]` attribute is now behind a feature gate.
10939 * Visibility is no longer allowed on `extern crate` statements, and
10940 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10941 * Trailing commas are now allowed in argument lists and tuple patterns.
10942 * The `do` keyword has been removed, it is now a reserved keyword.
10943 * Default type parameters have been implemented, but are feature gated.
10944 * Borrowed variables through captures in closures are now considered soundly.
10945 * `extern mod` is now `extern crate`
10946 * The `Freeze` trait has been removed.
10947 * The `Share` trait has been added for types that can be shared among
10949 * Labels in macros are now hygienic.
10950 * Expression/statement macro invocations can be delimited with `{}` now.
10951 * Treatment of types allowed in `static mut` locations has been tweaked.
10952 * The `*` and `.` operators are now overloadable through the `Deref` and
10954 * `~Trait` and `proc` no longer have `Send` bounds by default.
10955 * Partial type hints are now supported with the `_` type marker.
10956 * An `Unsafe` type was introduced for interior mutability. It is now
10957 considered undefined to transmute from `&T` to `&mut T` without using the
10959 * The #[linkage] attribute was implemented for extern statics/functions.
10960 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10961 * `Pod` was renamed to `Copy`.
10964 * The `libextra` library has been removed. It has now been decomposed into
10965 component libraries with smaller and more focused nuggets of
10966 functionality. The full list of libraries can be found on the
10967 documentation index page.
10968 * std: `std::condition` has been removed. All I/O errors are now propagated
10969 through the `Result` type. In order to assist with error handling, a
10970 `try!` macro for unwrapping errors with an early return and a lint for
10971 unused results has been added. See #12039 for more information.
10972 * std: The `vec` module has been renamed to `slice`.
10973 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10974 This will become the only growable vector in the future.
10975 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10976 are now found at `std::io::BufferedReader` instead of
10977 `std::io::buffered::BufferedReader`.
10978 * std: `print` and `println` are no longer in the prelude, the `print!` and
10979 `println!` macros are intended to be used instead.
10980 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10981 attempts to statically prevent cycles.
10982 * std: The standard distribution is adopting the policy of pushing failure
10983 to the user rather than failing in libraries. Many functions (such as
10984 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10985 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10986 deriving mode: `#[deriving(Show)]`.
10987 * std: `ToStr` is now implemented for all types implementing `Show`.
10988 * std: The formatting trait methods now take `&self` instead of `&T`
10989 * std: The `invert()` method on iterators has been renamed to `rev()`
10990 * std: `std::num` has seen a reduction in the genericity of its traits,
10991 consolidating functionality into a few core traits.
10992 * std: Backtraces are now printed on task failure if the environment
10993 variable `RUST_BACKTRACE` is present.
10994 * std: Naming conventions for iterators have been standardized. More details
10995 can be found on the wiki's style guide.
10996 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10997 still implement the function.
10998 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10999 * std: `assert_approx_eq!` has been removed
11000 * std: The `e` and `E` formatting specifiers for floats have been added to
11001 print them in exponential notation.
11002 * std: The `Times` trait has been removed
11003 * std: Indications of variance and opting out of builtin bounds is done
11004 through marker types in `std::kinds::marker` now
11005 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11006 `#[deriving(Hash)]` is now possible.
11007 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11008 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11009 * std: `Chan::new` is now `channel()`.
11010 * std: A new synchronous channel type has been implemented.
11011 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11012 * std: `hashmap` and `trie` have been moved to `libcollections`
11013 * std: `run` has been rolled into `io::process`
11014 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11015 * std: The equality and comparison traits have seen some reorganization.
11016 * std: `rand` has moved to `librand`.
11017 * std: `to_{lower,upper}case` has been implemented for `char`.
11018 * std: Logging has been moved to `liblog`.
11019 * collections: `HashMap` has been rewritten for higher performance and less
11021 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11022 it can be booted manually. The runtime guide has more information and
11024 * native: All I/O functionality except signals has been implemented.
11025 * green: Task spawning with `libgreen` has been optimized with stack caching
11026 and various trimming of code.
11027 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11028 * sync: The `extra::sync` module has been updated to modern rust (and moved
11029 to the `sync` library), tweaking and improving various interfaces while
11030 dropping redundant functionality.
11031 * sync: A new `Barrier` type has been added to the `sync` library.
11032 * sync: An efficient mutex for native and green tasks has been implemented.
11033 * serialize: The `base64` module has seen some improvement. It treats
11034 newlines better, has non-string error values, and has seen general
11036 * fourcc: A `fourcc!` macro was introduced
11037 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11038 hexadecimal literal.
11041 * `rustpkg` has been deprecated and removed from the main repository. Its
11042 replacement, `cargo`, is under development.
11043 * Nightly builds of rust are now available
11044 * The memory usage of rustc has been improved many times throughout this
11046 * The build process supports disabling rpath support for the rustc binary
11048 * Code generation has improved in some cases, giving more information to the
11049 LLVM optimization passes to enable more extensive optimizations.
11050 * Debuginfo compatibility with lldb on OSX has been restored.
11051 * The master branch is now gated on an android bot, making building for
11052 android much more reliable.
11053 * Output flags have been centralized into one `--emit` flag.
11054 * Crate type flags have been centralized into one `--crate-type` flag.
11055 * Codegen flags have been consolidated behind a `-C` flag.
11056 * Linking against outdated crates now has improved error messages.
11057 * Error messages with lifetimes will often suggest how to annotate the
11058 function to fix the error.
11059 * Many more types are documented in the standard library, and new guides
11061 * Many `rustdoc` improvements:
11062 * code blocks are syntax highlighted.
11063 * render standalone markdown files.
11064 * the --test flag tests all code blocks by default.
11065 * exported macros are displayed.
11066 * re-exported types have their documentation inlined at the location of the
11068 * search works across crates that have been rendered to the same output
11072 Version 0.9 (2014-01-09)
11073 ==========================
11075 * ~1800 changes, numerous bugfixes
11078 * The `float` type has been removed. Use `f32` or `f64` instead.
11079 * A new facility for enabling experimental features (feature gating) has
11080 been added, using the crate-level `#[feature(foo)]` attribute.
11081 * Managed boxes (@) are now behind a feature gate
11082 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11083 standard library's `Gc` or `Rc` types instead.
11084 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11085 * Jumping back to the top of a loop is now done with `continue` instead of
11087 * Strings can no longer be mutated through index assignment.
11088 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11089 hash delimiters, as in `r###"foo"###`.
11090 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11092 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11093 * `@fn`s have been removed.
11094 * `do` only works with procs in order to make it obvious what the cost
11096 * Single-element tuple-like structs can no longer be dereferenced to
11097 obtain the inner value. A more comprehensive solution for overloading
11098 the dereference operator will be provided in the future.
11099 * The `#[link(...)]` attribute has been replaced with
11100 `#[crate_id = "name#vers"]`.
11101 * Empty `impl`s must be terminated with empty braces and may not be
11102 terminated with a semicolon.
11103 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11104 no longer has any special meaning.
11105 * The old `fmt!` string formatting macro has been removed.
11106 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11107 `print!` and `println!`.
11108 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11109 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11110 `extern mod foo = "bar"` instead.
11111 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11112 * Macros can have attributes.
11113 * Macros can expand to items with attributes.
11114 * Macros can expand to multiple items.
11115 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11116 * Comments may be nested.
11117 * Values automatically coerce to trait objects they implement, without
11119 * Enum discriminants are no longer an entire word but as small as needed to
11120 contain all the variants. The `repr` attribute can be used to override
11121 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11122 `#[repr(C)]` to match C enums.
11123 * Non-string literals are not allowed in attributes (they never worked).
11124 * The FFI now supports variadic functions.
11125 * Octal numeric literals, as in `0o7777`.
11126 * The `concat!` syntax extension performs compile-time string concatenation.
11127 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11128 removed as Rust no longer uses segmented stacks.
11129 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11130 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11131 not `*`; ignoring remaining fields of a struct is also done with `..`,
11132 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11133 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11134 * `rustc` supports the "system" calling convention, which defaults to the
11135 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11137 * The `type_overflow` lint (default: warn) checks literals for overflow.
11138 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11139 * The `attribute_usage` lint (default: warn) warns about unknown
11141 * The `unknown_features` lint (default: warn) warns about unknown
11143 * The `dead_code` lint (default: warn) checks for dead code.
11144 * Rust libraries can be linked statically to one another
11145 * `#[link_args]` is behind the `link_args` feature gate.
11146 * Native libraries are now linked with `#[link(name = "foo")]`
11147 * Native libraries can be statically linked to a rust crate
11148 (`#[link(name = "foo", kind = "static")]`).
11149 * Native OS X frameworks are now officially supported
11150 (`#[link(name = "foo", kind = "framework")]`).
11151 * The `#[thread_local]` attribute creates thread-local (not task-local)
11152 variables. Currently behind the `thread_local` feature gate.
11153 * The `return` keyword may be used in closures.
11154 * Types that can be copied via a memcpy implement the `Pod` kind.
11155 * The `cfg` attribute can now be used on struct fields and enum variants.
11158 * std: The `option` and `result` API's have been overhauled to make them
11159 simpler, more consistent, and more composable.
11160 * std: The entire `std::io` module has been replaced with one that is
11161 more comprehensive and that properly interfaces with the underlying
11162 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11164 * std: `io::util` contains a number of useful implementations of
11165 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11166 `ZeroReader`, `TeeReader`.
11167 * std: The reference counted pointer type `extra::rc` moved into std.
11168 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11169 just a wrapper around it).
11170 * std: The `Either` type has been removed.
11171 * std: `fmt::Default` can be implemented for any type to provide default
11172 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11173 * std: The `rand` API continues to be tweaked.
11174 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11175 on failure in gdb, is now named `rust_fail`.
11176 * std: The `each_key` and `each_value` methods on `HashMap` have been
11177 replaced by the `keys` and `values` iterators.
11178 * std: Functions dealing with type size and alignment have moved from the
11179 `sys` module to the `mem` module.
11180 * std: The `path` module was written and API changed.
11181 * std: `str::from_utf8` has been changed to cast instead of allocate.
11182 * std: `starts_with` and `ends_with` methods added to vectors via the
11183 `ImmutableEqVector` trait, which is in the prelude.
11184 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11185 if the index is out of bounds.
11186 * std: Task failure no longer propagates between tasks, as the model was
11187 complex, expensive, and incompatible with thread-based tasks.
11188 * std: The `Any` type can be used for dynamic typing.
11189 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11191 * std: Methods that produce iterators generally do not have an `_iter`
11193 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11194 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11195 * std: `util::ignore` renamed to `prelude::drop`.
11196 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11198 * std: `vec::raw` has seen a lot of cleanup and API changes.
11199 * std: The standard library no longer includes any C++ code, and very
11200 minimal C, eliminating the dependency on libstdc++.
11201 * std: Runtime scheduling and I/O functionality has been factored out into
11202 extensible interfaces and is now implemented by two different crates:
11203 libnative, for native threading and I/O; and libgreen, for green threading
11204 and I/O. This paves the way for using the standard library in more limited
11205 embedded environments.
11206 * std: The `comm` module has been rewritten to be much faster, have a
11207 simpler, more consistent API, and to work for both native and green
11209 * std: All libuv dependencies have been moved into the rustuv crate.
11210 * native: New implementations of runtime scheduling on top of OS threads.
11211 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11213 * green: The green thread scheduler and message passing types are almost
11214 entirely lock-free.
11215 * extra: The `flatpipes` module had bitrotted and was removed.
11216 * extra: All crypto functions have been removed and Rust now has a policy of
11217 not reimplementing crypto in the standard library. In the future crypto
11218 will be provided by external crates with bindings to established libraries.
11219 * extra: `c_vec` has been modernized.
11220 * extra: The `sort` module has been removed. Use the `sort` method on
11224 * The `rust` and `rusti` commands have been removed, due to lack of
11226 * `rustdoc` was completely rewritten.
11227 * `rustdoc` can test code examples in documentation.
11228 * `rustpkg` can test packages with the argument, 'test'.
11229 * `rustpkg` supports arbitrary dependencies, including C libraries.
11230 * `rustc`'s support for generating debug info is improved again.
11231 * `rustc` has better error reporting for unbalanced delimiters.
11232 * `rustc`'s JIT support was removed due to bitrot.
11233 * Executables and static libraries can be built with LTO (-Z lto)
11234 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11238 Version 0.8 (2013-09-26)
11239 ============================
11241 * ~2200 changes, numerous bugfixes
11244 * The `for` loop syntax has changed to work with the `Iterator` trait.
11245 * At long last, unwinding works on Windows.
11246 * Default methods are ready for use.
11247 * Many trait inheritance bugs fixed.
11248 * Owned and borrowed trait objects work more reliably.
11249 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11250 * rustc can omit emission of code for the `debug!` macro if it is passed
11252 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11253 for foo.rs, then foo/mod.rs, and will generate an error when both are
11255 * Strings no longer contain trailing nulls. The new `std::c_str` module
11256 provides new mechanisms for converting to C strings.
11257 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11258 * The FFI has been overhauled such that foreign functions are called directly,
11259 instead of through a stack-switching wrapper.
11260 * Calling a foreign function must be done through a Rust function with the
11261 `#[fixed_stack_segment]` attribute.
11262 * The `externfn!` macro can be used to declare both a foreign function and
11263 a `#[fixed_stack_segment]` wrapper at once.
11264 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11265 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11266 * `priv` is disallowed everywhere except for struct fields and enum variants.
11267 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11268 * `ref` bindings in irrefutable patterns work correctly now.
11269 * `char` is now prevented from containing invalid code points.
11270 * Casting to `bool` is no longer allowed.
11271 * `\0` is now accepted as an escape in chars and strings.
11272 * `yield` is a reserved keyword.
11273 * `typeof` is a reserved keyword.
11274 * Crates may be imported by URL with `extern mod foo = "url";`.
11275 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11276 * Static vectors can be initialized with repeating elements,
11277 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11278 * Static structs can be initialized with functional record update,
11279 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11280 * `cfg!` can be used to conditionally execute code based on the crate
11281 configuration, similarly to `#[cfg(...)]`.
11282 * The `unnecessary_qualification` lint detects unneeded module
11283 prefixes (default: allow).
11284 * Arithmetic operations have been implemented on the SIMD types in
11285 `std::unstable::simd`.
11286 * Exchange allocation headers were removed, reducing memory usage.
11287 * `format!` implements a completely new, extensible, and higher-performance
11288 string formatting system. It will replace `fmt!`.
11289 * `print!` and `println!` write formatted strings (using the `format!`
11290 extension) to stdout.
11291 * `write!` and `writeln!` write formatted strings (using the `format!`
11292 extension) to the new Writers in `std::rt::io`.
11293 * The library section in which a function or static is placed may
11294 be specified with `#[link_section = "..."]`.
11295 * The `proto!` syntax extension for defining bounded message protocols
11297 * `macro_rules!` is hygienic for `let` declarations.
11298 * The `#[export_name]` attribute specifies the name of a symbol.
11299 * `unreachable!` can be used to indicate unreachable code, and fails
11303 * std: Transitioned to the new runtime, written in Rust.
11304 * std: Added an experimental I/O library, `rt::io`, based on the new
11306 * std: A new generic `range` function was added to the prelude, replacing
11307 `uint::range` and friends.
11308 * std: `range_rev` no longer exists. Since range is an iterator it can be
11309 reversed with `range(lo, hi).invert()`.
11310 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11311 renamed to `unwrap_or`.
11312 * std: The `iterator` module was renamed to `iter`.
11313 * std: Integral types now support the `checked_add`, `checked_sub`, and
11314 `checked_mul` operations for detecting overflow.
11315 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11317 * std: Methods are standardizing on conventions for casting methods:
11318 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11320 * std: The `CString` type in `c_str` provides new ways to convert to and
11322 * std: `DoubleEndedIterator` can yield elements in two directions.
11323 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11325 * std: `str::from_bytes` renamed to `str::from_utf8`.
11326 * std: `pop_opt` and `shift_opt` methods added to vectors.
11327 * std: The task-local data interface no longer uses @, and keys are
11328 no longer function pointers.
11329 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11330 * std: Added `SharedPort` to `comm`.
11331 * std: `Eq` has a default method for `ne`; only `eq` is required
11332 in implementations.
11333 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11334 is required in implementations.
11335 * std: `is_utf8` performance is improved, impacting many string functions.
11336 * std: `os::MemoryMap` provides cross-platform mmap.
11337 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11338 are not 'in-bounds' are considered undefined.
11339 * std: Many freestanding functions in `vec` removed in favor of methods.
11340 * std: Many freestanding functions on scalar types removed in favor of
11342 * std: Many options to task builders were removed since they don't make
11343 sense in the new scheduler design.
11344 * std: More containers implement `FromIterator` so can be created by the
11346 * std: More complete atomic types in `unstable::atomics`.
11347 * std: `comm::PortSet` removed.
11348 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11349 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11350 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11351 default implementations.
11352 * std: Various `from_str` functions were removed in favor of a generic
11353 `from_str` which is available in the prelude.
11354 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11355 * extra: `dlist`, the doubly-linked list was modernized.
11356 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11357 * extra: Added `glob` module, replacing `std::os::glob`.
11358 * extra: `rope` was removed.
11359 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11360 * extra: `net`, and `timer` were removed. The experimental replacements
11361 are `std::rt::io::net` and `std::rt::io::timer`.
11362 * extra: Iterators implemented for `SmallIntMap`.
11363 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11364 * extra: `SmallIntSet` removed. Use `BitvSet`.
11365 * extra: Performance of JSON parsing greatly improved.
11366 * extra: `semver` updated to SemVer 2.0.0.
11367 * extra: `term` handles more terminals correctly.
11368 * extra: `dbg` module removed.
11369 * extra: `par` module removed.
11370 * extra: `future` was cleaned up, with some method renames.
11371 * extra: Most free functions in `getopts` were converted to methods.
11374 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11375 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11376 similarly to gcc's `--march` flag.
11377 * rustc's performance compiling small crates is much better.
11378 * rustpkg has received many improvements.
11379 * rustpkg supports git tags as package IDs.
11380 * rustpkg builds into target-specific directories so it can be used for
11382 * The number of concurrent test tasks is controlled by the environment
11383 variable RUST_TEST_TASKS.
11384 * The test harness can now report metrics for benchmarks.
11385 * All tools have man pages.
11386 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11387 * The runtime uses jemalloc for allocations.
11388 * Segmented stacks are temporarily disabled as part of the transition to
11389 the new runtime. Stack overflows are possible!
11390 * A new documentation backend, rustdoc_ng, is available for use. It is
11391 still invoked through the normal `rustdoc` command.
11394 Version 0.7 (2013-07-03)
11395 =======================
11397 * ~2000 changes, numerous bugfixes
11400 * `impl`s no longer accept a visibility qualifier. Put them on methods
11402 * The borrow checker has been rewritten with flow-sensitivity, fixing
11403 many bugs and inconveniences.
11404 * The `self` parameter no longer implicitly means `&'self self`,
11405 and can be explicitly marked with a lifetime.
11406 * Overloadable compound operators (`+=`, etc.) have been temporarily
11407 removed due to bugs.
11408 * The `for` loop protocol now requires `for`-iterators to return `bool`
11409 so they compose better.
11410 * The `Durable` trait is replaced with the `'static` bounds.
11411 * Trait default methods work more often.
11412 * Structs with the `#[packed]` attribute have byte alignment and
11413 no padding between fields.
11414 * Type parameters bound by `Copy` must now be copied explicitly with
11415 the `copy` keyword.
11416 * It is now illegal to move out of a dereferenced unsafe pointer.
11417 * `Option<~T>` is now represented as a nullable pointer.
11418 * `@mut` does dynamic borrow checks correctly.
11419 * The `main` function is only detected at the topmost level of the crate.
11420 The `#[main]` attribute is still valid anywhere.
11421 * Struct fields may no longer be mutable. Use inherited mutability.
11422 * The `#[no_send]` attribute makes a type that would otherwise be
11424 * The `#[no_freeze]` attribute makes a type that would otherwise be
11426 * Unbounded recursion will abort the process after reaching the limit
11427 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11428 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11429 are never implicitly copyable.
11430 * `#[static_assert]` makes compile-time assertions about static bools.
11431 * At long last, 'argument modes' no longer exist.
11432 * The rarely used `use mod` statement no longer exists.
11434 * Syntax extensions
11435 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11437 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11438 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11439 `#[deriving(...)]`.
11440 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11441 and unsuffixed integer literals.
11444 * The `core` crate was renamed to `std`.
11445 * The `std` crate was renamed to `extra`.
11446 * More and improved documentation.
11447 * std: `iterator` module for external iterator objects.
11448 * Many old-style (internal, higher-order function) iterators replaced by
11449 implementations of `Iterator`.
11450 * std: Many old internal vector and string iterators,
11451 incl. `any`, `all`. removed.
11452 * std: The `finalize` method of `Drop` renamed to `drop`.
11453 * std: The `drop` method now takes `&mut self` instead of `&self`.
11454 * std: The prelude no longer re-exports any modules, only types and traits.
11455 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11456 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11457 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11458 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11459 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11460 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11461 * std: Many types implement `Clone`.
11462 * std: `path` type renamed to `Path`.
11463 * std: `mut` module and `Mut` type removed.
11464 * std: Many standalone functions removed in favor of methods and iterators
11465 in `vec`, `str`. In the future methods will also work as functions.
11466 * std: `reinterpret_cast` removed. Use `transmute`.
11467 * std: ascii string handling in `std::ascii`.
11468 * std: `Rand` is implemented for ~/@.
11469 * std: `run` module for spawning processes overhauled.
11470 * std: Various atomic types added to `unstable::atomic`.
11471 * std: Various types implement `Zero`.
11472 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11473 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11474 * std: Added `os::mkdir_recursive`.
11475 * std: Added `os::glob` function performs filesystems globs.
11476 * std: `FuzzyEq` renamed to `ApproxEq`.
11477 * std: `Map` now defines `pop` and `swap` methods.
11478 * std: `Cell` constructors converted to static methods.
11479 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11480 * extra: `flate` module moved from `std` to `extra`.
11481 * extra: `fileinput` module for iterating over a series of files.
11482 * extra: `Complex` number type and `complex` module.
11483 * extra: `Rational` number type and `rational` module.
11484 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11485 * extra: `term` uses terminfo now, is more correct.
11486 * extra: `arc` functions converted to methods.
11487 * extra: Implementation of fixed output size variations of SHA-2.
11490 * `unused_variables` lint mode for unused variables (default: warn).
11491 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11493 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11495 * `dead_assignment` lint mode for unread variables (default: warn).
11496 * `unnecessary_allocation` lint mode detects some heap allocations that are
11497 immediately borrowed so could be written without allocating (default: warn).
11498 * `missing_doc` lint mode (default: allow).
11499 * `unreachable_code` lint mode (default: warn).
11500 * The `rusti` command has been rewritten and a number of bugs addressed.
11501 * rustc outputs in color on more terminals.
11502 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11503 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11504 * Compiling with `-g` will make the binary record information about
11505 dynamic borrowcheck failures for debugging.
11506 * rustdoc has a nicer stylesheet.
11507 * Various improvements to rustdoc.
11508 * Improvements to rustpkg (see the detailed release notes).
11511 Version 0.6 (2013-04-03)
11512 ========================
11514 * ~2100 changes, numerous bugfixes
11517 * The self type parameter in traits is now spelled `Self`
11518 * The `self` parameter in trait and impl methods must now be explicitly
11519 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11520 * Static methods no longer require the `static` keyword and instead
11521 are distinguished by the lack of a `self` parameter
11522 * Replaced the `Durable` trait with the `'static` lifetime
11523 * The old closure type syntax with the trailing sigil has been
11524 removed in favor of the more consistent leading sigil
11525 * `super` is a keyword, and may be prefixed to paths
11526 * Trait bounds are separated with `+` instead of whitespace
11527 * Traits are implemented with `impl Trait for Type`
11528 instead of `impl Type: Trait`
11529 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11530 * The `export` keyword has finally been removed
11531 * The `move` keyword has been removed (see "Semantic changes")
11532 * The interior mutability qualifier on vectors, `[mut T]`, has been
11533 removed. Use `&mut [T]`, etc.
11534 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11535 * `fail` is no longer a keyword. Use `fail!()`
11536 * `assert` is no longer a keyword. Use `assert!()`
11537 * `log` is no longer a keyword. use `debug!`, etc.
11538 * 1-tuples may be represented as `(T,)`
11539 * Struct fields may no longer be `mut`. Use inherited mutability,
11540 `@mut T`, `core::mut` or `core::cell`
11541 * `extern mod { ... }` is no longer valid syntax for foreign
11542 function modules. Use extern blocks: `extern { ... }`
11543 * Newtype enums removed. Use tuple-structs.
11544 * Trait implementations no longer support visibility modifiers
11545 * Pattern matching over vectors improved and expanded
11546 * `const` renamed to `static` to correspond to lifetime name,
11547 and make room for future `static mut` unsafe mutable globals.
11548 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11549 * `Clone` implementations can be automatically generated with
11550 `#[deriving(Clone)]`
11551 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11552 instead of `foo as Bar`.
11553 * Fixed length vector types are now written as `[int, .. 3]`
11554 instead of `[int * 3]`.
11555 * Fixed length vector types can express the length as a constant
11556 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11559 * Types with owned pointers or custom destructors move by default,
11560 eliminating the `move` keyword
11561 * All foreign functions are considered unsafe
11562 * &mut is now unaliasable
11563 * Writes to borrowed @mut pointers are prevented dynamically
11565 * The name of the main function can be customized using #[main]
11566 * The default type of an inferred closure is &fn instead of @fn
11567 * `use` statements may no longer be "chained" - they cannot import
11568 identifiers imported by previous `use` statements
11569 * `use` statements are crate relative, importing from the "top"
11570 of the crate by default. Paths may be prefixed with `super::`
11571 or `self::` to change the search behavior.
11572 * Method visibility is inherited from the implementation declaration
11573 * Structural records have been removed
11574 * Many more types can be used in static items, including enums
11575 'static-lifetime pointers and vectors
11576 * Pattern matching over vectors improved and expanded
11577 * Typechecking of closure types has been overhauled to
11578 improve inference and eliminate unsoundness
11579 * Macros leave scope at the end of modules, unless that module is
11580 tagged with #[macro_escape]
11583 * Added big integers to `std::bigint`
11584 * Removed `core::oldcomm` module
11585 * Added pipe-based `core::comm` module
11586 * Numeric traits have been reorganized under `core::num`
11587 * `vec::slice` finally returns a slice
11588 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11589 * Containers reorganized around traits in `core::container`
11590 * `core::dvec` removed, `~[T]` is a drop-in replacement
11591 * `core::send_map` renamed to `core::hashmap`
11592 * `std::map` removed; replaced with `core::hashmap`
11593 * `std::treemap` reimplemented as an owned balanced tree
11594 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11595 * `core::trie` added as a fast ordered map for integer keys
11596 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11597 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11598 overload the comparison operators, whereas `TotalOrd` is used
11599 by certain container types
11602 * Replaced the 'cargo' package manager with 'rustpkg'
11603 * Added all-purpose 'rust' tool
11604 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11605 * rustc now *attempts* to offer spelling suggestions
11606 * Improved support for ARM and Android
11607 * Preliminary MIPS backend
11608 * Improved foreign function ABI implementation for x86, x86_64
11609 * Various memory usage improvements
11610 * Rust code may be embedded in foreign code under limited circumstances
11611 * Inline assembler supported by new asm!() syntax extension.
11614 Version 0.5 (2012-12-21)
11615 ===========================
11617 * ~900 changes, numerous bugfixes
11620 * Removed `<-` move operator
11621 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11622 * Removed old fixed length vector syntax - `[T]/N`
11623 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11624 * Macros may now expand to items and statements
11625 * `a.b()` is always parsed as a method call, never as a field projection
11626 * `Eq` and `IterBytes` implementations can be automatically generated
11627 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11628 * Removed the special crate language for `.rc` files
11629 * Function arguments may consist of any irrefutable pattern
11632 * `&` and `~` pointers may point to objects
11633 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11634 * Enum variants may be structs
11635 * Destructors can be added to all nominal types with the Drop trait
11636 * Structs and nullary enum variants may be constants
11637 * Values that cannot be implicitly copied are now automatically moved
11638 without writing `move` explicitly
11639 * `&T` may now be coerced to `*T`
11640 * Coercions happen in `let` statements as well as function calls
11641 * `use` statements now take crate-relative paths
11642 * The module and type namespaces have been merged so that static
11643 method names can be resolved under the trait in which they are
11646 * Improved support for language features
11647 * Trait inheritance works in many scenarios
11648 * More support for explicit self arguments in methods - `self`, `&self`
11649 `@self`, and `~self` all generally work as expected
11650 * Static methods work in more situations
11651 * Experimental: Traits may declare default methods for the implementations
11655 * New condition handling system in `core::condition`
11656 * Timsort added to `std::sort`
11657 * New priority queue, `std::priority_queue`
11658 * Pipes for serializable types, `std::flatpipes'
11659 * Serialization overhauled to be trait-based
11660 * Expanded `getopts` definitions
11661 * Moved futures to `std`
11662 * More functions are pure now
11663 * `core::comm` renamed to `oldcomm`. Still deprecated
11664 * `rustdoc` and `cargo` are libraries now
11667 * Added a preliminary REPL, `rusti`
11668 * License changed from MIT to dual MIT/APL2
11671 Version 0.4 (2012-10-15)
11672 ==========================
11674 * ~2000 changes, numerous bugfixes
11677 * All keywords are now strict and may not be used as identifiers anywhere
11678 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11679 'of', 'with', 'to', 'class'.
11680 * Classes are replaced with simpler structs
11681 * Explicit method self types
11682 * `ret` became `return` and `alt` became `match`
11683 * `import` is now `use`; `use is now `extern mod`
11684 * `extern mod { ... }` is now `extern { ... }`
11685 * `use mod` is the recommended way to import modules
11686 * `pub` and `priv` replace deprecated export lists
11687 * The syntax of `match` pattern arms now uses fat arrow (=>)
11688 * `main` no longer accepts an args vector; use `os::args` instead
11691 * Trait implementations are now coherent, ala Haskell typeclasses
11692 * Trait methods may be static
11693 * Argument modes are deprecated
11694 * Borrowed pointers are much more mature and recommended for use
11695 * Strings and vectors in the static region are stored in constant memory
11696 * Typestate was removed
11697 * Resolution rewritten to be more reliable
11698 * Support for 'dual-mode' data structures (freezing and thawing)
11701 * Most binary operators can now be overloaded via the traits in
11703 * `std::net::url` for representing URLs
11704 * Sendable hash maps in `core::send_map`
11705 * `core::task' gained a (currently unsafe) task-local storage API
11708 * An efficient new intertask communication primitive called the pipe,
11709 along with a number of higher-level channel types, in `core::pipes`
11710 * `std::arc`, an atomically reference counted, immutable, shared memory
11712 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11713 * Futures are now based on pipes and sendable
11714 * More robust linked task failure
11715 * Improved task builder API
11718 * Improved error reporting
11719 * Preliminary JIT support
11720 * Preliminary work on precise GC
11721 * Extensive architectural improvements to rustc
11722 * Begun a transition away from buggy C++-based reflection (shape) code to
11723 Rust-based (visitor) code
11724 * All hash functions and tables converted to secure, randomized SipHash
11727 Version 0.3 (2012-07-12)
11728 ========================
11730 * ~1900 changes, numerous bugfixes
11732 * New coding conveniences
11733 * Integer-literal suffix inference
11734 * Per-item control over warnings, errors
11735 * #[cfg(windows)] and #[cfg(unix)] attributes
11736 * Documentation comments
11737 * More compact closure syntax
11738 * 'do' expressions for treating higher-order functions as
11740 * *-patterns (wildcard extended to all constructor fields)
11743 * Name resolution pass and exhaustiveness checker rewritten
11744 * Region pointers and borrow checking supersede alias
11746 * Init-ness checking is now provided by a region-based liveness
11747 pass instead of the typestate pass; same for last-use analysis
11748 * Extensive work on region pointers
11750 * Experimental new language features
11751 * Slices and fixed-size, interior-allocated vectors
11752 * #!-comments for lang versioning, shell execution
11753 * Destructors and iface implementation for classes;
11754 type-parameterized classes and class methods
11755 * 'const' type kind for types that can be used to implement
11756 shared-memory concurrency patterns
11760 * Removal of various obsolete features
11761 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11762 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11764 * Constructs: do-while loops ('do' repurposed), fn binding,
11765 resources (replaced by destructors)
11767 * Compiler reorganization
11768 * Syntax-layer of compiler split into separate crate
11769 * Clang (from LLVM project) integrated into build
11770 * Typechecker split into sub-modules
11773 * New time functions
11774 * Extension methods for many built-in types
11775 * Arc: atomic-refcount read-only / exclusive-use shared cells
11776 * Par: parallel map and search routines
11777 * Extensive work on libuv interface
11778 * Much vector code moved to libraries
11779 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11780 #include, #include_str, #include_bin
11782 * Tool improvements
11783 * Cargo automatically resolves dependencies
11786 Version 0.2 (2012-03-29)
11787 =========================
11789 * >1500 changes, numerous bugfixes
11791 * New docs and doc tooling
11793 * New port: FreeBSD x86_64
11795 * Compilation model enhancements
11796 * Generics now specialized, multiply instantiated
11797 * Functions now inlined across separate crates
11799 * Scheduling, stack and threading fixes
11800 * Noticeably improved message-passing performance
11801 * Explicit schedulers
11805 * Experimental new language features
11806 * Operator overloading
11810 * Various language extensions
11811 * C-callback function types: 'crust fn ...'
11812 * Infinite-loop construct: 'loop { ... }'
11813 * Shorten 'mutable' to 'mut'
11814 * Required mutable-local qualifier: 'let mut ...'
11815 * Basic glob-exporting: 'export foo::*;'
11816 * Alt now exhaustive, 'alt check' for runtime-checked
11817 * Block-function form of 'for' loop, with 'break' and 'ret'.
11820 * AST quasi-quote syntax extension
11821 * Revived libuv interface
11822 * New modules: core::{future, iter}, std::arena
11823 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11824 * Extensive cleanup, regularization in libstd, libcore
11827 Version 0.1 (2012-01-20)
11828 ===============================
11830 * Most language features work, including:
11831 * Unique pointers, unique closures, move semantics
11832 * Interface-constrained generics
11833 * Static interface dispatch
11835 * Multithread task scheduling
11836 * Typestate predicates
11837 * Failure unwinding, destructors
11838 * Pattern matching and destructuring assignment
11839 * Lightweight block-lambda syntax
11840 * Preliminary macro-by-example
11842 * Compiler works with the following configurations:
11843 * Linux: x86 and x86_64 hosts and targets
11844 * macOS: x86 and x86_64 hosts and targets
11845 * Windows: x86 hosts and targets
11847 * Cross compilation / multi-target configuration supported.
11849 * Preliminary API-documentation and package-management tools included.
11853 * Documentation is incomplete.
11855 * Performance is below intended target.
11857 * Standard library APIs are subject to extensive change, reorganization.
11859 * Language-level versioning is not yet operational - future code will
11860 break unexpectedly.