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 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
21 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
22 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
23 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
24 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
25 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
26 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
27 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
28 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
33 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
34 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
35 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
36 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
37 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
38 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
39 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
40 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
41 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
42 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
43 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
44 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
45 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
46 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
47 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
48 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
49 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
50 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
51 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
53 These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
55 - [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
56 - [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
57 - [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
58 - [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
59 - [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
60 - [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
62 These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
64 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
65 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
66 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
67 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
68 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
69 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
70 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
71 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
72 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
73 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
74 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
75 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
76 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
78 These APIs are now usable in const contexts:
80 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
84 - [Packages can now inherit settings from the workspace so that the settings
85 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
86 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
88 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
89 for more details on how to define these common settings.
90 - [Cargo commands can now accept multiple `--target` flags to build for
91 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
92 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
93 config option may now take an array of multiple targets.
94 - [The `--jobs` argument can now take a negative number to count backwards from
95 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
96 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
97 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
98 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
99 flag to `cargo rustc` to override the crate type.
100 - [Significantly improved the performance fetching git dependencies from GitHub
101 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
105 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
109 - 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/)
110 - [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.
111 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
112 - [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.
113 - [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.
114 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
115 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
116 - 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/).
117 - [`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.
122 These changes do not affect any public interfaces of Rust, but they represent
123 significant improvements to the performance or internals of rustc and related
126 - 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/)
127 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
128 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
129 - Many improvements to generated code for derives, including performance improvements:
130 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
131 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
132 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
133 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
134 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
135 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
136 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
137 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
138 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
139 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
140 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
142 Version 1.63.0 (2022-08-11)
143 ==========================
147 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
148 - [Modify MIR building to drop repeat expressions with length zero.][95953]
149 - [Remove label/lifetime shadowing warnings.][96296]
150 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
151 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
152 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
153 - [lub: don't bail out due to empty binders.][97867]
157 - [Stabilize the `bundle` native library modifier,][95818] also removing the
158 deprecated `static-nobundle` linking kind.
159 - [Add Apple WatchOS compile targets\*.][95243]
160 - [Add a Windows application manifest to rustc-main.][96737]
162 \* Refer to Rust's [platform support page][platform-support-doc] for more
163 information on Rust's tiered platform support.
167 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
168 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
169 - [`impl Read and Write for VecDeque<u8>`.][95632]
170 - [STD support for the Nintendo 3DS.][95897]
171 - [Use rounding in float to Duration conversion methods.][96051]
172 - [Make write/print macros eagerly drop temporaries.][96455]
173 - [Implement internal traits that enable `[OsStr]::join`.][96881]
174 - [Implement `Hash` for `core::alloc::Layout`.][97034]
175 - [Add capacity documentation for `OsString`.][97202]
176 - [Put a bound on collection misbehavior.][97316]
177 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
178 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
179 - [Document Rust's stance on `/proc/self/mem`.][97837]
186 - [`BinaryHeap::try_reserve`]
187 - [`BinaryHeap::try_reserve_exact`]
188 - [`OsString::try_reserve`]
189 - [`OsString::try_reserve_exact`]
190 - [`PathBuf::try_reserve`]
191 - [`PathBuf::try_reserve_exact`]
192 - [`Path::try_exists`]
193 - [`Ref::filter_map`]
194 - [`RefMut::filter_map`]
195 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
196 - [`ToOwned::clone_into`]
197 - [`Ipv6Addr::to_ipv4_mapped`]
199 - [`unix::io::BorrowedFd<'fd>`]
200 - [`unix::io::OwnedFd`]
201 - [`windows::io::AsHandle`]
202 - [`windows::io::BorrowedHandle<'handle>`]
203 - [`windows::io::OwnedHandle`]
204 - [`windows::io::HandleOrInvalid`]
205 - [`windows::io::HandleOrNull`]
206 - [`windows::io::InvalidHandleError`]
207 - [`windows::io::NullHandleError`]
208 - [`windows::io::AsSocket`]
209 - [`windows::io::BorrowedSocket<'handle>`]
210 - [`windows::io::OwnedSocket`]
213 - [`thread::ScopedJoinHandle`]
215 These APIs are now usable in const contexts:
217 - [`array::from_ref`]
218 - [`slice::from_ref`]
219 - [`intrinsics::copy`]
220 - [`intrinsics::copy_nonoverlapping`]
221 - [`<*const T>::copy_to`]
222 - [`<*const T>::copy_to_nonoverlapping`]
223 - [`<*mut T>::copy_to`]
224 - [`<*mut T>::copy_to_nonoverlapping`]
225 - [`<*mut T>::copy_from`]
226 - [`<*mut T>::copy_from_nonoverlapping`]
228 - [`Utf8Error::error_len`]
229 - [`Utf8Error::valid_up_to`]
236 - [Stabilize the `--config path` command-line argument.][cargo/10755]
237 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
242 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
243 errors for invalid attribute arguments that were previously ignored.
244 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
245 duration can differ slightly from what it was.
250 These changes provide no direct user facing benefits, but represent significant
251 improvements to the internals and overall performance of rustc
254 - [Prepare Rust for LLVM opaque pointers.][94214]
256 [94214]: https://github.com/rust-lang/rust/pull/94214/
257 [94530]: https://github.com/rust-lang/rust/pull/94530/
258 [94954]: https://github.com/rust-lang/rust/pull/94954/
259 [95243]: https://github.com/rust-lang/rust/pull/95243/
260 [95565]: https://github.com/rust-lang/rust/pull/95565/
261 [95632]: https://github.com/rust-lang/rust/pull/95632/
262 [95818]: https://github.com/rust-lang/rust/pull/95818/
263 [95897]: https://github.com/rust-lang/rust/pull/95897/
264 [95953]: https://github.com/rust-lang/rust/pull/95953/
265 [96051]: https://github.com/rust-lang/rust/pull/96051/
266 [96296]: https://github.com/rust-lang/rust/pull/96296/
267 [96455]: https://github.com/rust-lang/rust/pull/96455/
268 [96737]: https://github.com/rust-lang/rust/pull/96737/
269 [96868]: https://github.com/rust-lang/rust/pull/96868/
270 [96881]: https://github.com/rust-lang/rust/pull/96881/
271 [96885]: https://github.com/rust-lang/rust/pull/96885/
272 [96959]: https://github.com/rust-lang/rust/pull/96959/
273 [97034]: https://github.com/rust-lang/rust/pull/97034/
274 [97202]: https://github.com/rust-lang/rust/pull/97202/
275 [97316]: https://github.com/rust-lang/rust/pull/97316/
276 [97652]: https://github.com/rust-lang/rust/pull/97652/
277 [97675]: https://github.com/rust-lang/rust/pull/97675/
278 [97803]: https://github.com/rust-lang/rust/pull/97803/
279 [97837]: https://github.com/rust-lang/rust/pull/97837/
280 [97867]: https://github.com/rust-lang/rust/pull/97867/
281 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
282 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
284 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
285 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
286 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
287 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
288 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
289 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
290 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
291 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
292 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
293 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
294 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
295 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
296 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
297 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
298 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
299 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
300 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
301 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
302 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
303 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
304 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
305 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
306 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
307 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
308 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
309 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
310 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
311 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
312 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
313 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
315 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
316 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
317 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
318 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
319 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
320 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
321 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
322 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
323 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
324 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
325 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
326 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
327 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
328 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
329 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
330 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
332 Version 1.62.1 (2022-07-19)
333 ==========================
335 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
336 library, and also mitigates a CPU vulnerability on Intel SGX.
338 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
339 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
340 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
341 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
342 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
344 [98608]: https://github.com/rust-lang/rust/issues/98608
345 [98890]: https://github.com/rust-lang/rust/issues/98890
346 [98950]: https://github.com/rust-lang/rust/pull/98950
347 [98126]: https://github.com/rust-lang/rust/pull/98126
348 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
350 Version 1.62.0 (2022-06-30)
351 ==========================
356 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
357 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
358 - [Fix constants not getting dropped if part of a diverging expression][94775]
359 - [Support unit struct/enum variant in destructuring assignment][95380]
360 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
361 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
366 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
367 - [Make `unaligned_references` lint deny-by-default][95372]
368 This lint is also a future compatibility lint, and is expected to eventually
370 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
371 - [Reject `#[thread_local]` attribute on non-static items][95006]
372 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
373 - [Implement a lint to warn about unused macro rules][96150]
374 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
376 \* Refer to Rust's [platform support page][platform-support-doc] for more
377 information on Rust's tiered platform support.
382 - [Windows: Use a pipe relay for chaining pipes][95841]
383 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
384 - [Replace RwLock by a futex based one on Linux][95801]
385 - [std: directly use pthread in UNIX parker implementation][96393]
390 - [`bool::then_some`]
394 - [`windows::CommandExt::raw_arg`]
395 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
396 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
397 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
398 - [`FusedIterator for EncodeWide`]
399 - [RDM intrinsics on aarch64][stdarch/1285]
404 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
409 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
411 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
412 - Package ID specs now support `name@version` syntax in addition to the
413 previous `name:version` to align with the behavior in `cargo add` and other
414 tools. `cargo install` and `cargo yank` also now support this syntax so the
415 version does not need to passed as a separate flag.
416 - The `git` and `registry` directories in Cargo's home directory (usually
417 `~/.cargo`) are now marked as cache directories so that they are not
418 included in backups or content indexing (on Windows).
419 - Added automatic `@` argfile support, which will use "response files" if the
420 command-line to `rustc` exceeds the operating system's limit.
425 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
426 the same as the host target.
427 [#10594](https://github.com/rust-lang/cargo/pull/10594)
428 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
429 - [rustdoc: Remove .woff font files][96279]
430 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
431 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
432 complete synchronously][95469].
437 - [Unify ReentrantMutex implementations across all platforms][96042]
439 These changes provide no direct user facing benefits, but represent significant
440 improvements to the internals and overall performance of rustc
443 [93313]: https://github.com/rust-lang/rust/pull/93313/
444 [93969]: https://github.com/rust-lang/rust/pull/93969/
445 [94206]: https://github.com/rust-lang/rust/pull/94206/
446 [94457]: https://github.com/rust-lang/rust/pull/94457/
447 [94775]: https://github.com/rust-lang/rust/pull/94775/
448 [94872]: https://github.com/rust-lang/rust/pull/94872/
449 [95006]: https://github.com/rust-lang/rust/pull/95006/
450 [95035]: https://github.com/rust-lang/rust/pull/95035/
451 [95346]: https://github.com/rust-lang/rust/pull/95346/
452 [95372]: https://github.com/rust-lang/rust/pull/95372/
453 [95380]: https://github.com/rust-lang/rust/pull/95380/
454 [95431]: https://github.com/rust-lang/rust/pull/95431/
455 [95469]: https://github.com/rust-lang/rust/pull/95469/
456 [95705]: https://github.com/rust-lang/rust/pull/95705/
457 [95801]: https://github.com/rust-lang/rust/pull/95801/
458 [95819]: https://github.com/rust-lang/rust/pull/95819/
459 [95841]: https://github.com/rust-lang/rust/pull/95841/
460 [96042]: https://github.com/rust-lang/rust/pull/96042/
461 [96150]: https://github.com/rust-lang/rust/pull/96150/
462 [96268]: https://github.com/rust-lang/rust/pull/96268/
463 [96279]: https://github.com/rust-lang/rust/pull/96279/
464 [96393]: https://github.com/rust-lang/rust/pull/96393/
465 [96436]: https://github.com/rust-lang/rust/pull/96436/
466 [96557]: https://github.com/rust-lang/rust/pull/96557/
467 [96630]: https://github.com/rust-lang/rust/pull/96630/
469 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
470 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
471 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
472 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
473 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
474 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
475 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
476 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
477 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
478 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
480 Version 1.61.0 (2022-05-19)
481 ==========================
486 - [`const fn` signatures can now include generic trait bounds][93827]
487 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
488 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
489 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
494 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
495 - [The `char` type is now described as UTF-32 in debuginfo][89887]
496 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
497 - X86 [`#[target_feature = "adx"]` is now stable][93745]
502 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
503 - [`#[ignore = "…"]` messages are printed when running tests][92714]
504 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
505 - [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.
506 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
507 - [`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.
512 - [`Pin::static_mut`]
513 - [`Pin::static_ref`]
514 - [`Vec::retain_mut`]
515 - [`VecDeque::retain_mut`]
516 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
517 - [`std::os::unix::net::SocketAddr::from_pathname`]
518 - [`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.
519 - [`std::thread::JoinHandle::is_finished`]
521 These APIs are now usable in const contexts:
523 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
524 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
525 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
526 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
527 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
528 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
529 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
530 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
531 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
536 No feature changes, but see compatibility notes.
541 - 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
542 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
543 - (less common) or be updated to use the [`+whole-archive`] modifier.
544 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
545 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
546 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
547 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
548 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
549 - [`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`.
550 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
555 These changes provide no direct user facing benefits, but represent significant
556 improvements to the internals and overall performance of rustc
559 - [debuginfo: Refactor debuginfo generation for types][94261]
560 - [Remove the everybody loops pass][93913]
562 [88375]: https://github.com/rust-lang/rust/pull/88375/
563 [89887]: https://github.com/rust-lang/rust/pull/89887/
564 [90621]: https://github.com/rust-lang/rust/pull/90621/
565 [92285]: https://github.com/rust-lang/rust/pull/92285/
566 [92472]: https://github.com/rust-lang/rust/pull/92472/
567 [92697]: https://github.com/rust-lang/rust/pull/92697/
568 [92714]: https://github.com/rust-lang/rust/pull/92714/
569 [92911]: https://github.com/rust-lang/rust/pull/92911/
570 [93263]: https://github.com/rust-lang/rust/pull/93263/
571 [93745]: https://github.com/rust-lang/rust/pull/93745/
572 [93827]: https://github.com/rust-lang/rust/pull/93827/
573 [93901]: https://github.com/rust-lang/rust/pull/93901/
574 [93913]: https://github.com/rust-lang/rust/pull/93913/
575 [93965]: https://github.com/rust-lang/rust/pull/93965/
576 [94081]: https://github.com/rust-lang/rust/pull/94081/
577 [94261]: https://github.com/rust-lang/rust/pull/94261/
578 [94295]: https://github.com/rust-lang/rust/pull/94295/
579 [94832]: https://github.com/rust-lang/rust/pull/94832/
580 [95016]: https://github.com/rust-lang/rust/pull/95016/
581 [95251]: https://github.com/rust-lang/rust/pull/95251/
582 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
583 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
584 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
585 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
586 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
587 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
588 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
589 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
590 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
591 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
592 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
593 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
594 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
595 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
596 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
597 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
598 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
599 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
600 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
601 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
602 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
603 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
606 Version 1.60.0 (2022-04-07)
607 ==========================
611 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
612 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
616 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
617 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
618 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
619 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
620 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
621 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
622 - [Fix invalid removal of newlines from doc comments][92357]
623 - [Add kernel target for RustyHermit][92670]
624 - [Deny mixing bin crate type with lib crate types][92933]
625 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
626 - [Upgrade to LLVM 14][93577]
628 \* Refer to Rust's [platform support page][platform-support-doc] for more
629 information on Rust's tiered platform support.
633 - [Guarantee call order for `sort_by_cached_key`][89621]
634 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
635 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
636 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
637 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
641 - [`Arc::new_cyclic`][arc_new_cyclic]
642 - [`Rc::new_cyclic`][rc_new_cyclic]
643 - [`slice::EscapeAscii`][slice_escape_ascii]
644 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
645 - [`u8::escape_ascii`][u8_escape_ascii]
646 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
647 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
648 - [`MaybeUninit::assume_init_read`][assume_init_read]
649 - [`i8::abs_diff`][i8_abs_diff]
650 - [`i16::abs_diff`][i16_abs_diff]
651 - [`i32::abs_diff`][i32_abs_diff]
652 - [`i64::abs_diff`][i64_abs_diff]
653 - [`i128::abs_diff`][i128_abs_diff]
654 - [`isize::abs_diff`][isize_abs_diff]
655 - [`u8::abs_diff`][u8_abs_diff]
656 - [`u16::abs_diff`][u16_abs_diff]
657 - [`u32::abs_diff`][u32_abs_diff]
658 - [`u64::abs_diff`][u64_abs_diff]
659 - [`u128::abs_diff`][u128_abs_diff]
660 - [`usize::abs_diff`][usize_abs_diff]
661 - [`Display for io::ErrorKind`][display_error_kind]
662 - [`From<u8> for ExitCode`][from_u8_exit_code]
663 - [`Not for !` (the "never" type)][not_never]
664 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
665 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
669 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
670 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
671 - [Stabilize namespaced and weak dependency features.][cargo/10269]
672 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
673 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
677 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
678 - [Drop rustc-docs from complete profile][93742]
679 - [bootstrap: tidy up flag handling for llvm build][93918]
683 - [Remove compiler-rt linking hack on Android][83822]
684 - [Mitigations for platforms with non-monotonic clocks have been removed from
685 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
686 instant is not guaranteed to be greater than an earlier instant anymore.
687 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
688 saturating to `0` instead][89926]. In the real world the panic happened mostly
689 on platforms with buggy monotonic clock implementations rather than catching
690 programming errors like reversing the start and end times. Such programming
691 errors will now results in `0` rather than a panic.
692 - In a future release we're planning to increase the baseline requirements for
693 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
694 your feedback in [PR #95026][95026].
699 These changes provide no direct user facing benefits, but represent significant
700 improvements to the internals and overall performance of rustc
703 - [Switch all libraries to the 2021 edition][92068]
705 [83822]: https://github.com/rust-lang/rust/pull/83822
706 [86374]: https://github.com/rust-lang/rust/pull/86374
707 [87487]: https://github.com/rust-lang/rust/pull/87487
708 [89621]: https://github.com/rust-lang/rust/pull/89621
709 [89926]: https://github.com/rust-lang/rust/pull/89926
710 [90132]: https://github.com/rust-lang/rust/pull/90132
711 [90247]: https://github.com/rust-lang/rust/pull/90247
712 [91606]: https://github.com/rust-lang/rust/pull/91606
713 [92068]: https://github.com/rust-lang/rust/pull/92068
714 [92300]: https://github.com/rust-lang/rust/pull/92300
715 [92357]: https://github.com/rust-lang/rust/pull/92357
716 [92383]: https://github.com/rust-lang/rust/pull/92383
717 [92630]: https://github.com/rust-lang/rust/pull/92630
718 [92670]: https://github.com/rust-lang/rust/pull/92670
719 [92800]: https://github.com/rust-lang/rust/pull/92800
720 [92933]: https://github.com/rust-lang/rust/pull/92933
721 [93566]: https://github.com/rust-lang/rust/pull/93566
722 [93577]: https://github.com/rust-lang/rust/pull/93577
723 [93658]: https://github.com/rust-lang/rust/pull/93658
724 [93742]: https://github.com/rust-lang/rust/pull/93742
725 [93824]: https://github.com/rust-lang/rust/pull/93824
726 [93918]: https://github.com/rust-lang/rust/pull/93918
727 [95026]: https://github.com/rust-lang/rust/pull/95026
729 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
730 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
731 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
732 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
733 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
735 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
736 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
737 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
738 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
739 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
740 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
741 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
742 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
743 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
744 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
745 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
746 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
747 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
748 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
749 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
750 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
751 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
752 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
753 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
754 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
755 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
756 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
757 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
758 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
759 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
761 Version 1.59.0 (2022-02-24)
762 ==========================
767 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
768 - [Stabilize destructuring assignment][90521]
769 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
770 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
775 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
776 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
777 - [Fix sparc64 ABI for aggregates with floating point members][91003]
778 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
779 - [Add support for riscv64gc-unknown-freebsd][91284]
780 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
781 - [Soft disable incremental compilation][94124]
783 This release disables incremental compilation, unless the user has explicitly
784 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
785 This is due to a known and relatively frequently occurring bug in incremental
786 compilation, which causes builds to issue internal compiler errors. This
787 particular bug is already fixed on nightly, but that fix has not yet rolled out
788 to stable and is deemed too risky for a direct stable backport.
790 As always, we encourage users to test with nightly and report bugs so that we
791 can track failures and fix issues earlier.
793 See [94124] for more details.
795 [94124]: https://github.com/rust-lang/rust/issues/94124
800 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
805 - [`std::thread::available_parallelism`][available_parallelism]
806 - [`Result::copied`][result-copied]
807 - [`Result::cloned`][result-cloned]
808 - [`arch::asm!`][asm]
809 - [`arch::global_asm!`][global_asm]
810 - [`ops::ControlFlow::is_break`][is_break]
811 - [`ops::ControlFlow::is_continue`][is_continue]
812 - [`TryFrom<char> for u8`][try_from_char_u8]
813 - [`char::TryFromCharError`][try_from_char_err]
814 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
816 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
817 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
818 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
819 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
820 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
821 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
822 - [`DoubleEndedIterator for ToLowercase`][lowercase]
823 - [`DoubleEndedIterator for ToUppercase`][uppercase]
824 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
825 - [`UnwindSafe for Once`][unwindsafe_once]
826 - [`RefUnwindSafe for Once`][refunwindsafe_once]
827 - [armv8 neon intrinsics for aarch64][stdarch/1266]
831 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
832 - [`mem::MaybeUninit::assume_init`][muninit_init]
833 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
834 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
839 - [Stabilize the `strip` profile option][cargo/10088]
840 - [Stabilize future-incompat-report][cargo/10165]
841 - [Support abbreviating `--release` as `-r`][cargo/10133]
842 - [Support `term.quiet` configuration][cargo/10152]
843 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
848 - [Refactor weak symbols in std::sys::unix][90846]
849 This may add new, versioned, symbols when building with a newer glibc, as the
850 standard library uses weak linkage rather than dynamically attempting to load
851 certain symbols at runtime.
852 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
853 This adds a future compatibility lint to supporting the use of cfg_attr
854 wrapping either crate_type or crate_name specification within Rust files;
855 it is recommended that users migrate to setting the equivalent command line
857 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
858 This may expose new names, leading to conflicts with preexisting names in a
859 given namespace and a compilation failure.
860 - [Cargo will document libraries before binaries.][cargo/10172]
861 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
862 - [Weaken guarantee around advancing underlying iterators in zip][83791]
863 - [Make split_inclusive() on an empty slice yield an empty output][89825]
864 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
865 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
870 These changes provide no direct user facing benefits, but represent significant
871 improvements to the internals and overall performance of rustc
874 - [Fix many cases of normalization-related ICEs][91255]
875 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
876 - [Store liveness in interval sets for region inference][90637]
878 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
879 unstable feature.][91867]
881 [91867]: https://github.com/rust-lang/rust/issues/91867
882 [83744]: https://github.com/rust-lang/rust/pull/83744/
883 [83791]: https://github.com/rust-lang/rust/pull/83791/
884 [85013]: https://github.com/rust-lang/rust/pull/85013/
885 [89825]: https://github.com/rust-lang/rust/pull/89825/
886 [89999]: https://github.com/rust-lang/rust/pull/89999/
887 [90128]: https://github.com/rust-lang/rust/pull/90128/
888 [90207]: https://github.com/rust-lang/rust/pull/90207/
889 [90521]: https://github.com/rust-lang/rust/pull/90521/
890 [90586]: https://github.com/rust-lang/rust/pull/90586/
891 [90637]: https://github.com/rust-lang/rust/pull/90637/
892 [90833]: https://github.com/rust-lang/rust/pull/90833/
893 [90846]: https://github.com/rust-lang/rust/pull/90846/
894 [91003]: https://github.com/rust-lang/rust/pull/91003/
895 [91172]: https://github.com/rust-lang/rust/pull/91172/
896 [91255]: https://github.com/rust-lang/rust/pull/91255/
897 [91284]: https://github.com/rust-lang/rust/pull/91284/
898 [91535]: https://github.com/rust-lang/rust/pull/91535/
899 [91593]: https://github.com/rust-lang/rust/pull/91593/
900 [91728]: https://github.com/rust-lang/rust/pull/91728/
901 [91878]: https://github.com/rust-lang/rust/pull/91878/
902 [91896]: https://github.com/rust-lang/rust/pull/91896/
903 [91926]: https://github.com/rust-lang/rust/pull/91926/
904 [91984]: https://github.com/rust-lang/rust/pull/91984/
905 [92020]: https://github.com/rust-lang/rust/pull/92020/
906 [92034]: https://github.com/rust-lang/rust/pull/92034/
907 [92137]: https://github.com/rust-lang/rust/pull/92137/
908 [92483]: https://github.com/rust-lang/rust/pull/92483/
909 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
910 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
911 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
912 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
913 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
914 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
915 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
916 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
918 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
919 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
920 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
921 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
922 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
923 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
924 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
925 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
926 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
927 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
928 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
929 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
930 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
931 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
932 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
933 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
934 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
935 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
936 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
937 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
938 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
939 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
940 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
941 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
942 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
943 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
945 Version 1.58.1 (2022-01-19)
946 ===========================
948 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
949 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
950 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
951 * [Fix wrong error message displayed when some imports are missing][91254]
952 * [Fix rustfmt not formatting generated files from stdin][92912]
954 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
955 [91254]: https://github.com/rust-lang/rust/pull/91254
956 [92912]: https://github.com/rust-lang/rust/pull/92912
957 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
958 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
960 Version 1.58.0 (2022-01-13)
961 ==========================
966 - [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.
967 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
968 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
973 - [Add LLVM CFI support to the Rust compiler][89652]
974 - [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.
975 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
976 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
977 - [Update the minimum external LLVM to 12][90175]
978 - [Add `x86_64-unknown-none` at Tier 3*][89062]
979 - [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.
980 - [Don't abort compilation after giving a lint error][87337]
981 - [Error messages point at the source of trait bound obligations in more places][89580]
983 \* Refer to Rust's [platform support page][platform-support-doc] for more
984 information on Rust's tiered platform support.
989 - [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.
990 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
991 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
992 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
993 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
994 - [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).
999 - [`Metadata::is_symlink`]
1000 - [`Path::is_symlink`]
1001 - [`{integer}::saturating_div`]
1002 - [`Option::unwrap_unchecked`]
1003 - [`Result::unwrap_unchecked`]
1004 - [`Result::unwrap_err_unchecked`]
1007 These APIs are now usable in const contexts:
1010 - [`Duration::checked_add`]
1011 - [`Duration::saturating_add`]
1012 - [`Duration::checked_sub`]
1013 - [`Duration::saturating_sub`]
1014 - [`Duration::checked_mul`]
1015 - [`Duration::saturating_mul`]
1016 - [`Duration::checked_div`]
1021 - [Add --message-format for install command][cargo/10107]
1022 - [Warn when alias shadows external subcommand][cargo/10082]
1027 - [Show all Deref implementations recursively in rustdoc][90183]
1028 - [Use computed visibility in rustdoc][88447]
1033 - [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.
1034 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1035 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1036 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1037 - [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.
1038 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1043 These changes provide no direct user facing benefits, but represent significant
1044 improvements to the internals and overall performance of rustc
1047 - [Implement coherence checks for negative trait impls][90104]
1048 - [Add rustc lint, warning when iterating over hashmaps][89558]
1049 - [Optimize live point computation][90491]
1050 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1051 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1053 [87337]: https://github.com/rust-lang/rust/pull/87337/
1054 [87467]: https://github.com/rust-lang/rust/pull/87467/
1055 [87704]: https://github.com/rust-lang/rust/pull/87704/
1056 [88041]: https://github.com/rust-lang/rust/pull/88041/
1057 [88447]: https://github.com/rust-lang/rust/pull/88447/
1058 [88601]: https://github.com/rust-lang/rust/pull/88601/
1059 [89062]: https://github.com/rust-lang/rust/pull/89062/
1060 [89174]: https://github.com/rust-lang/rust/pull/89174/
1061 [89551]: https://github.com/rust-lang/rust/pull/89551/
1062 [89558]: https://github.com/rust-lang/rust/pull/89558/
1063 [89580]: https://github.com/rust-lang/rust/pull/89580/
1064 [89652]: https://github.com/rust-lang/rust/pull/89652/
1065 [90041]: https://github.com/rust-lang/rust/pull/90041/
1066 [90058]: https://github.com/rust-lang/rust/pull/90058/
1067 [90104]: https://github.com/rust-lang/rust/pull/90104/
1068 [90117]: https://github.com/rust-lang/rust/pull/90117/
1069 [90175]: https://github.com/rust-lang/rust/pull/90175/
1070 [90183]: https://github.com/rust-lang/rust/pull/90183/
1071 [90297]: https://github.com/rust-lang/rust/pull/90297/
1072 [90329]: https://github.com/rust-lang/rust/pull/90329/
1073 [90361]: https://github.com/rust-lang/rust/pull/90361/
1074 [90417]: https://github.com/rust-lang/rust/pull/90417/
1075 [90473]: https://github.com/rust-lang/rust/pull/90473/
1076 [90491]: https://github.com/rust-lang/rust/pull/90491/
1077 [90733]: https://github.com/rust-lang/rust/pull/90733/
1078 [90833]: https://github.com/rust-lang/rust/pull/90833/
1079 [90846]: https://github.com/rust-lang/rust/pull/90846/
1080 [91026]: https://github.com/rust-lang/rust/pull/91026/
1081 [91207]: https://github.com/rust-lang/rust/pull/91207/
1082 [91255]: https://github.com/rust-lang/rust/pull/91255/
1083 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1084 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1085 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1086 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1087 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1088 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1089 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1090 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1091 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1092 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1094 Version 1.57.0 (2021-12-02)
1095 ==========================
1100 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1101 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1102 - [Allow panicking in constant evaluation.][89508]
1103 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1108 - [Create more accurate debuginfo for vtables.][89597]
1109 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1110 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1111 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1112 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1114 \* Refer to Rust's [platform support page][platform-support-doc] for more
1115 information on Rust's tiered platform support.
1120 - [Avoid allocations and copying in `Vec::leak`][89337]
1121 - [Add `#[repr(i8)]` to `Ordering`][89507]
1122 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1123 - [Update to Unicode 14.0][89614]
1124 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1125 when ignoring their return value. This helps catch mistakes such as expecting
1126 a function to mutate a value in place rather than return a new value.
1131 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1132 - [`[T; N]::as_slice`][`array::as_slice`]
1133 - [`collections::TryReserveError`]
1134 - [`HashMap::try_reserve`]
1135 - [`HashSet::try_reserve`]
1136 - [`String::try_reserve`]
1137 - [`String::try_reserve_exact`]
1138 - [`Vec::try_reserve`]
1139 - [`Vec::try_reserve_exact`]
1140 - [`VecDeque::try_reserve`]
1141 - [`VecDeque::try_reserve_exact`]
1142 - [`Iterator::map_while`]
1143 - [`iter::MapWhile`]
1144 - [`proc_macro::is_available`]
1145 - [`Command::get_program`]
1146 - [`Command::get_args`]
1147 - [`Command::get_envs`]
1148 - [`Command::get_current_dir`]
1152 These APIs are now usable in const contexts:
1154 - [`hint::unreachable_unchecked`]
1159 - [Stabilize custom profiles][cargo/9943]
1164 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1165 This will break some builds that set `#![deny(dead_code)]`.
1169 These changes provide no direct user facing benefits, but represent significant
1170 improvements to the internals and overall performance of rustc
1173 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1175 [85200]: https://github.com/rust-lang/rust/pull/85200/
1176 [86191]: https://github.com/rust-lang/rust/pull/86191/
1177 [87220]: https://github.com/rust-lang/rust/pull/87220/
1178 [87260]: https://github.com/rust-lang/rust/pull/87260/
1179 [88321]: https://github.com/rust-lang/rust/pull/88321/
1180 [88529]: https://github.com/rust-lang/rust/pull/88529/
1181 [88690]: https://github.com/rust-lang/rust/pull/88690/
1182 [88952]: https://github.com/rust-lang/rust/pull/88952/
1183 [89337]: https://github.com/rust-lang/rust/pull/89337/
1184 [89507]: https://github.com/rust-lang/rust/pull/89507/
1185 [89508]: https://github.com/rust-lang/rust/pull/89508/
1186 [89582]: https://github.com/rust-lang/rust/pull/89582/
1187 [89597]: https://github.com/rust-lang/rust/pull/89597/
1188 [89614]: https://github.com/rust-lang/rust/pull/89614/
1189 [89692]: https://github.com/rust-lang/rust/issues/89692/
1190 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1191 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1192 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1193 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1194 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1195 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1196 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1197 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1198 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1199 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1200 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1201 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1202 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1203 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1204 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1205 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1206 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1207 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1208 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1209 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1210 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1212 Version 1.56.1 (2021-11-01)
1213 ===========================
1215 - New lints to detect the presence of bidirectional-override Unicode
1216 codepoints in the compiled source code ([CVE-2021-42574])
1218 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1220 Version 1.56.0 (2021-10-21)
1221 ========================
1226 - [The 2021 Edition is now stable.][rust#88100]
1227 See [the edition guide][rust-2021-edition-guide] for more details.
1228 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1229 - [Union field access is permitted in `const fn`.][rust#85769]
1231 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1236 - [Upgrade to LLVM 13.][rust#87570]
1237 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1238 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1239 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1240 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1241 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1242 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1243 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1245 \* Refer to Rust's [platform support page][platform-support-doc] for more
1246 information on Rust's tiered platform support.
1251 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1252 The Windows console still requires valid Unicode, but this change allows
1253 splitting a UTF-8 character across multiple write calls. This allows, for
1254 instance, programs that just read and write data buffers (e.g. copying a file
1255 to stdout) without regard for Unicode or character boundaries.
1256 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1257 For this use case, atomics scale much better under contention.
1258 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1259 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1260 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1261 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1262 - [Treat invalid environment variable names as non-existent.][rust#86183]
1263 Previously, the environment functions would panic if given a variable name
1264 with an internal null character or equal sign (`=`). Now, these functions will
1265 just treat such names as non-existent variables, since the OS cannot represent
1266 the existence of a variable with such a name.
1271 - [`std::os::unix::fs::chroot`]
1272 - [`UnsafeCell::raw_get`]
1273 - [`BufWriter::into_parts`]
1274 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1275 These APIs were previously stable in `std`, but are now also available in `core`.
1276 - [`Vec::shrink_to`]
1277 - [`String::shrink_to`]
1278 - [`OsString::shrink_to`]
1279 - [`PathBuf::shrink_to`]
1280 - [`BinaryHeap::shrink_to`]
1281 - [`VecDeque::shrink_to`]
1282 - [`HashMap::shrink_to`]
1283 - [`HashSet::shrink_to`]
1285 These APIs are now usable in const contexts:
1287 - [`std::mem::transmute`]
1288 - [`[T]::first`][`slice::first`]
1289 - [`[T]::split_first`][`slice::split_first`]
1290 - [`[T]::last`][`slice::last`]
1291 - [`[T]::split_last`][`slice::split_last`]
1296 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1297 This has no effect at present on dependency version selection.
1298 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1299 that support Rust code to include a crate's specified minimum version in the test matrix for that
1305 - [Update to new argument parsing rules on Windows.][rust#87580]
1306 This adjusts Rust's standard library to match the behavior of the standard
1307 libraries for C/C++. The rules have changed slightly over time, and this PR
1308 brings us to the latest set of rules (changed in 2008).
1309 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1310 This was already not supported by LLVM; this change surfaces this lack of
1311 support with a better error message.
1312 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1313 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1314 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1315 may return different values on glibc <= 2.24.][rust#81825]
1316 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1317 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1318 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1319 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1323 These changes provide no direct user facing benefits, but represent significant
1324 improvements to the internals and overall performance of rustc
1327 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1328 This improves the performance of most Rust builds.
1329 - [Unify representation of macros in internal data structures.][rust#88019]
1330 This change fixes a host of bugs with the handling of macros by the compiler,
1333 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1334 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1335 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1336 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1337 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1338 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1339 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1340 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1341 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1342 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1343 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1344 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1345 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1346 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1347 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1348 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1349 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1350 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1351 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1352 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1353 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1354 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1355 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1356 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1357 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1358 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1359 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1360 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1361 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1362 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1363 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1364 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1365 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1366 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1367 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1368 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1369 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1370 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1371 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1372 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1373 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1374 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1376 Version 1.55.0 (2021-09-09)
1377 ============================
1381 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1382 will end at the maximum value of the integer.][83918]
1383 - [You can now explicitly import the prelude of different editions
1384 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1388 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1390 \* Refer to Rust's [platform support page][platform-support-doc] for more
1391 information on Rust's tiered platform support.
1396 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1397 These improvements should in general provide faster string parsing of floats,
1398 no longer reject certain valid floating point values, and reduce
1399 the produced code size for non-stripped artifacts.
1400 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1407 - [`IntoInnerError::into_error`]
1408 - [`IntoInnerError::into_parts`]
1409 - [`MaybeUninit::assume_init_mut`]
1410 - [`MaybeUninit::assume_init_ref`]
1411 - [`MaybeUninit::write`]
1413 - [`ops::ControlFlow`]
1415 - [`x86::_bittestandcomplement`]
1416 - [`x86::_bittestandreset`]
1417 - [`x86::_bittestandset`]
1418 - [`x86_64::_bittest64`]
1419 - [`x86_64::_bittestandcomplement64`]
1420 - [`x86_64::_bittestandreset64`]
1421 - [`x86_64::_bittestandset64`]
1423 The following previously stable functions are now `const`.
1425 - [`str::from_utf8_unchecked`]
1430 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1431 rustc in parallel such as when using `cargo test`.][cargo/9675]
1432 - [The package definition in `cargo metadata` now includes the `"default_run"`
1433 field from the manifest.][cargo/9550]
1434 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1435 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1436 of packages.][cargo/9663]
1440 - [Added "Go to item on exact match" search option.][85876]
1441 - [The "Implementors" section on traits no longer shows redundant
1442 method definitions.][85970]
1443 - [Trait implementations are toggled open by default.][86260] This should make the
1444 implementations more searchable by tools like `CTRL+F` in your browser.
1445 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1446 through type aliases.][86334]
1447 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1448 "Trait Implementations" section.][86513]
1453 - [std functions that return an `io::Error` will no longer use the
1454 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1455 kinds of errors could be categorised [into newer more specific `ErrorKind`
1456 variants][79965], and that they do not represent a user error.
1457 - [Using environment variable names with `process::Command` on Windows now
1458 behaves as expected.][85270] Previously using envionment variables with
1459 `Command` would cause them to be ASCII-uppercased.
1460 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1461 with `rustdoc::`][86849]
1462 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1463 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1464 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1467 [86849]: https://github.com/rust-lang/rust/pull/86849
1468 [86513]: https://github.com/rust-lang/rust/pull/86513
1469 [86334]: https://github.com/rust-lang/rust/pull/86334
1470 [86260]: https://github.com/rust-lang/rust/pull/86260
1471 [85970]: https://github.com/rust-lang/rust/pull/85970
1472 [85876]: https://github.com/rust-lang/rust/pull/85876
1473 [83572]: https://github.com/rust-lang/rust/pull/83572
1474 [86294]: https://github.com/rust-lang/rust/pull/86294
1475 [86858]: https://github.com/rust-lang/rust/pull/86858
1476 [86761]: https://github.com/rust-lang/rust/pull/86761
1477 [85746]: https://github.com/rust-lang/rust/pull/85746
1478 [85270]: https://github.com/rust-lang/rust/pull/85270
1479 [83918]: https://github.com/rust-lang/rust/pull/83918
1480 [79965]: https://github.com/rust-lang/rust/pull/79965
1481 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1482 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1483 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1484 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1485 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1486 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1487 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1488 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1489 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1490 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1491 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1492 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1493 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1494 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1495 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1496 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1497 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1498 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1499 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1500 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1501 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1502 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1505 Version 1.54.0 (2021-07-29)
1506 ============================
1509 -----------------------
1511 - [You can now use macros for values in some built-in attributes.][83366]
1512 This primarily allows you to call macros within the `#[doc]` attribute. For
1513 example, to include external documentation in your crate, you can now write
1516 #![doc = include_str!("README.md")]
1519 - [You can now cast between unsized slice types (and types which contain
1520 unsized slices) in `const fn`.][85078]
1521 - [You can now use multiple generic lifetimes with `impl Trait` where the
1522 lifetimes don't explicitly outlive another.][84701] In code this means
1523 that you can now have `impl Trait<'a, 'b>` where as before you could
1524 only have `impl Trait<'a, 'b> where 'b: 'a`.
1527 -----------------------
1529 - [Rustc will now search for custom JSON targets in
1530 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1531 directory.][83800] You can find your sysroot directory by running
1532 `rustc --print sysroot`.
1533 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1534 - [You can now use `#[target_feature]` on safe functions when targeting
1535 WebAssembly platforms.][84988]
1536 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1537 - [Added tier 3\* support for `bpfel-unknown-none`
1538 and `bpfeb-unknown-none`.][79608]
1539 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1541 \* Refer to Rust's [platform support page][platform-support-doc] for more
1542 information on Rust's tiered platform support.
1545 -----------------------
1547 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1548 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1549 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1550 - [The implementations of vendor intrinsics in core::arch have been
1551 significantly refactored.][83278] The main user-visible changes are
1552 a 50% reduction in the size of libcore.rlib and stricter validation
1553 of constant operands passed to intrinsics. The latter is technically
1554 a breaking change, but allows Rust to more closely match the C vendor
1560 - [`BTreeMap::into_keys`]
1561 - [`BTreeMap::into_values`]
1562 - [`HashMap::into_keys`]
1563 - [`HashMap::into_values`]
1565 - [`VecDeque::binary_search`]
1566 - [`VecDeque::binary_search_by`]
1567 - [`VecDeque::binary_search_by_key`]
1568 - [`VecDeque::partition_point`]
1573 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1574 the dependency graph.][cargo/9520]
1575 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1576 in the tree ][cargo/9499]
1577 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1578 macro dependencies.][cargo/9488]
1579 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1580 This variable points to a directory that integration tests and benches
1581 can use as a "scratchpad" for testing filesystem operations.
1585 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1586 - [Previously unsound code is no longer permitted where different constructors in branches
1587 could require different lifetimes.][85574]
1588 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1589 than before and may reject some previously accepted code.
1590 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1591 when compiled with `codegen-units = 1`.][86063]
1593 [85574]: https://github.com/rust-lang/rust/issues/85574
1594 [86831]: https://github.com/rust-lang/rust/issues/86831
1595 [86063]: https://github.com/rust-lang/rust/issues/86063
1596 [79608]: https://github.com/rust-lang/rust/pull/79608
1597 [84988]: https://github.com/rust-lang/rust/pull/84988
1598 [84701]: https://github.com/rust-lang/rust/pull/84701
1599 [84072]: https://github.com/rust-lang/rust/pull/84072
1600 [85745]: https://github.com/rust-lang/rust/pull/85745
1601 [84744]: https://github.com/rust-lang/rust/pull/84744
1602 [85078]: https://github.com/rust-lang/rust/pull/85078
1603 [84717]: https://github.com/rust-lang/rust/pull/84717
1604 [83800]: https://github.com/rust-lang/rust/pull/83800
1605 [83366]: https://github.com/rust-lang/rust/pull/83366
1606 [83278]: https://github.com/rust-lang/rust/pull/83278
1607 [85292]: https://github.com/rust-lang/rust/pull/85292
1608 [82834]: https://github.com/rust-lang/rust/pull/82834
1609 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1610 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1611 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1612 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1613 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1614 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1615 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1616 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1617 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1618 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1619 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1621 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1623 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1625 Version 1.53.0 (2021-06-17)
1626 ============================
1629 -----------------------
1630 - [You can now use unicode for identifiers.][83799] This allows multilingual
1631 identifiers but still doesn't allow glyphs that are not considered characters
1632 such as `◆` or `🦀`. More specifically you can now use any identifier that
1633 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1634 is the same standard as languages like Python, however Rust uses NFC
1635 normalization which may be different from other languages.
1636 - [You can now specify "or patterns" inside pattern matches.][79278]
1637 Previously you could only use `|` (OR) on complete patterns. E.g.
1641 matches!(x, Some(1) | Some(2));
1643 matches!(x, Some(1 | 2));
1645 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1646 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1647 to change semantics to being a pattern fragment in a future edition.
1650 -----------------------
1651 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1652 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1653 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1655 \* Refer to Rust's [platform support page][platform-support-doc] for more
1656 information on Rust's tiered platform support.
1659 -----------------------
1660 - [Abort messages will now forward to `android_set_abort_message` on
1661 Android platforms when available.][81469]
1662 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1663 - [Arrays of any length now implement `IntoIterator`.][84147]
1664 Currently calling `.into_iter()` as a method on an array will
1665 return `impl Iterator<Item=&T>`, but this may change in a
1666 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1667 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1668 - [`leading_zeros`, and `trailing_zeros` are now available on all
1669 `NonZero` integer types.][84082]
1670 - [`{f32, f64}::from_str` now parse and print special values
1671 (`NaN`, `-0`) according to IEEE 754.][78618]
1672 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1673 - [Add the `BITS` associated constant to all numeric types.][82565]
1677 - [`AtomicBool::fetch_update`]
1678 - [`AtomicPtr::fetch_update`]
1679 - [`BTreeMap::retain`]
1680 - [`BTreeSet::retain`]
1681 - [`BufReader::seek_relative`]
1682 - [`DebugStruct::non_exhaustive`]
1684 - [`Duration::ZERO`]
1685 - [`Duration::is_zero`]
1686 - [`Duration::saturating_add`]
1687 - [`Duration::saturating_mul`]
1688 - [`Duration::saturating_sub`]
1689 - [`ErrorKind::Unsupported`]
1690 - [`Option::insert`]
1691 - [`Ordering::is_eq`]
1692 - [`Ordering::is_ge`]
1693 - [`Ordering::is_gt`]
1694 - [`Ordering::is_le`]
1695 - [`Ordering::is_lt`]
1696 - [`Ordering::is_ne`]
1697 - [`OsStr::is_ascii`]
1698 - [`OsStr::make_ascii_lowercase`]
1699 - [`OsStr::make_ascii_uppercase`]
1700 - [`OsStr::to_ascii_lowercase`]
1701 - [`OsStr::to_ascii_uppercase`]
1702 - [`Peekable::peek_mut`]
1703 - [`Rc::decrement_strong_count`]
1704 - [`Rc::increment_strong_count`]
1705 - [`Vec::extend_from_within`]
1706 - [`array::from_mut`]
1707 - [`array::from_ref`]
1708 - [`cmp::max_by_key`]
1710 - [`cmp::min_by_key`]
1712 - [`f32::is_subnormal`]
1713 - [`f64::is_subnormal`]
1716 -----------------------
1717 - [Cargo now supports git repositories where the default `HEAD` branch is not
1718 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1719 which can handle default branches correctly.
1720 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1721 - [The `authors` field is no longer included in `Cargo.toml` for new
1722 projects.][cargo/9282]
1725 -----------------------
1726 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1727 without hyperlinks.][81764]
1731 - [Implement token-based handling of attributes during expansion][82608]
1732 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1733 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1734 to confusion and potential security vulnerabilities and [is no
1735 longer recommended][ietf6943].
1736 - [The added `BITS` constant may conflict with external definitions.][85667]
1737 In particular, this was known to be a problem in the `lexical-core` crate,
1738 but they have published fixes for semantic versions 0.4 through 0.7. To
1739 update this dependency alone, use `cargo update -p lexical-core`.
1740 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1744 These changes provide no direct user facing benefits, but represent significant
1745 improvements to the internals and overall performance of rustc and
1748 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1749 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1750 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1751 - [Rework rustdoc const type][82873]
1753 [85667]: https://github.com/rust-lang/rust/pull/85667
1754 [83386]: https://github.com/rust-lang/rust/pull/83386
1755 [82771]: https://github.com/rust-lang/rust/pull/82771
1756 [84147]: https://github.com/rust-lang/rust/pull/84147
1757 [84082]: https://github.com/rust-lang/rust/pull/84082
1758 [83799]: https://github.com/rust-lang/rust/pull/83799
1759 [83681]: https://github.com/rust-lang/rust/pull/83681
1760 [83652]: https://github.com/rust-lang/rust/pull/83652
1761 [83387]: https://github.com/rust-lang/rust/pull/83387
1762 [82873]: https://github.com/rust-lang/rust/pull/82873
1763 [82864]: https://github.com/rust-lang/rust/pull/82864
1764 [82608]: https://github.com/rust-lang/rust/pull/82608
1765 [82565]: https://github.com/rust-lang/rust/pull/82565
1766 [80525]: https://github.com/rust-lang/rust/pull/80525
1767 [79278]: https://github.com/rust-lang/rust/pull/79278
1768 [78618]: https://github.com/rust-lang/rust/pull/78618
1769 [77704]: https://github.com/rust-lang/rust/pull/77704
1770 [83941]: https://github.com/rust-lang/rust/pull/83941
1771 [83065]: https://github.com/rust-lang/rust/pull/83065
1772 [81764]: https://github.com/rust-lang/rust/pull/81764
1773 [81469]: https://github.com/rust-lang/rust/pull/81469
1774 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1775 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1776 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1777 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1778 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1779 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1780 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1781 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1782 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1783 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1784 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1785 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1786 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1787 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1788 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1789 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1790 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1791 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1792 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1793 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1794 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1795 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1796 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1797 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1798 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1799 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1800 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1801 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1802 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1803 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1804 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1805 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1806 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1807 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1808 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1809 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1810 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1811 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1812 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1813 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1814 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1817 Version 1.52.1 (2021-05-10)
1818 ============================
1820 This release disables incremental compilation, unless the user has explicitly
1821 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1823 This is due to the widespread, and frequently occurring, breakage encountered by
1824 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1825 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1826 newly added incremental verification are still present in past stable versions,
1827 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1830 These problems only affect incremental builds, so release builds with Cargo
1831 should not be affected unless the user has explicitly opted into incremental.
1832 Debug and check builds are affected.
1834 See [84970] for more details.
1836 [84970]: https://github.com/rust-lang/rust/issues/84970
1838 Version 1.52.0 (2021-05-06)
1839 ============================
1843 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1844 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1845 is allowed by default, and may become a warning or hard error in a
1847 - [You can now cast mutable references to arrays to a pointer of the same type as
1848 the element.][81479]
1852 - [Upgraded the default LLVM to LLVM 12.][81451]
1854 Added tier 3\* support for the following targets.
1856 - [`s390x-unknown-linux-musl`][82166]
1857 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1858 - [`powerpc-unknown-openbsd`][82733]
1860 \* Refer to Rust's [platform support page][platform-support-doc] for more
1861 information on Rust's tiered platform support.
1865 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1866 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1867 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1868 - [All integer division and remainder operations are now `const`.][80962]
1872 - [`Arguments::as_str`]
1874 - [`char::REPLACEMENT_CHARACTER`]
1875 - [`char::UNICODE_VERSION`]
1876 - [`char::decode_utf16`]
1877 - [`char::from_digit`]
1878 - [`char::from_u32_unchecked`]
1879 - [`char::from_u32`]
1880 - [`slice::partition_point`]
1881 - [`str::rsplit_once`]
1882 - [`str::split_once`]
1884 The following previously stable APIs are now `const`.
1886 - [`char::len_utf8`]
1887 - [`char::len_utf16`]
1888 - [`char::to_ascii_uppercase`]
1889 - [`char::to_ascii_lowercase`]
1890 - [`char::eq_ignore_ascii_case`]
1891 - [`u8::to_ascii_uppercase`]
1892 - [`u8::to_ascii_lowercase`]
1893 - [`u8::eq_ignore_ascii_case`]
1897 - [Rustdoc lints are now treated as a tool lint, meaning that
1898 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1899 Using the old style is still allowed, and will become a warning in
1901 - [Rustdoc now supports argument files.][82261]
1902 - [Rustdoc now generates smart punctuation for documentation.][79423]
1903 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1911 - [You can now pass multiple filters to tests.][81356] E.g.
1912 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1913 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1914 allowing you to see `std` symbols when debugging.][82218]
1918 These changes provide no direct user facing benefits, but represent significant
1919 improvements to the internals and overall performance of rustc and
1922 - [Check the result cache before the DepGraph when ensuring queries][81855]
1923 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1924 - [Only store a LocalDefId in some HIR nodes][81611]
1925 - [Store HIR attributes in a side table][79519]
1929 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1930 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1931 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1932 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1933 languages in code blocks.][78429]
1934 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1935 - [Changes in how proc macros handle whitespace may lead to panics when used
1936 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1937 - [Turn `#[derive]` into a regular macro attribute][79078]
1939 [84136]: https://github.com/rust-lang/rust/issues/84136
1940 [80763]: https://github.com/rust-lang/rust/pull/80763
1941 [82166]: https://github.com/rust-lang/rust/pull/82166
1942 [82121]: https://github.com/rust-lang/rust/pull/82121
1943 [81879]: https://github.com/rust-lang/rust/pull/81879
1944 [82261]: https://github.com/rust-lang/rust/pull/82261
1945 [82218]: https://github.com/rust-lang/rust/pull/82218
1946 [82216]: https://github.com/rust-lang/rust/pull/82216
1947 [82202]: https://github.com/rust-lang/rust/pull/82202
1948 [81855]: https://github.com/rust-lang/rust/pull/81855
1949 [81766]: https://github.com/rust-lang/rust/pull/81766
1950 [81744]: https://github.com/rust-lang/rust/pull/81744
1951 [81611]: https://github.com/rust-lang/rust/pull/81611
1952 [81479]: https://github.com/rust-lang/rust/pull/81479
1953 [81451]: https://github.com/rust-lang/rust/pull/81451
1954 [81356]: https://github.com/rust-lang/rust/pull/81356
1955 [80962]: https://github.com/rust-lang/rust/pull/80962
1956 [80553]: https://github.com/rust-lang/rust/pull/80553
1957 [80527]: https://github.com/rust-lang/rust/pull/80527
1958 [79519]: https://github.com/rust-lang/rust/pull/79519
1959 [79423]: https://github.com/rust-lang/rust/pull/79423
1960 [79208]: https://github.com/rust-lang/rust/pull/79208
1961 [78429]: https://github.com/rust-lang/rust/pull/78429
1962 [82733]: https://github.com/rust-lang/rust/pull/82733
1963 [82594]: https://github.com/rust-lang/rust/pull/82594
1964 [79078]: https://github.com/rust-lang/rust/pull/79078
1965 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1966 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1967 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1968 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1969 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1970 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1971 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1972 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1973 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1974 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1975 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1976 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1977 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1978 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1979 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1980 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1981 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1982 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1983 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1984 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1985 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1986 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1988 Version 1.51.0 (2021-03-25)
1989 ============================
1993 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1994 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1995 E.g. you can now write the following. Note: Only values of primitive integers,
1996 `bool`, or `char` types are currently permitted.
1998 struct GenericArray<T, const LENGTH: usize> {
2002 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2003 const fn last(&self) -> Option<&T> {
2007 Some(&self.inner[LENGTH - 1])
2017 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2018 This option controls whether debug information is split across multiple files
2019 or packed into a single file. **Note** This option is unstable on other platforms.
2020 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2021 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2022 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2023 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2025 \* Refer to Rust's [platform support page][platform-support-doc] for more
2026 information on Rust's tiered platform support.
2031 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2032 - [`str` now implements `AsMut<str>`.][80279]
2033 - [`u64` and `u128` now implement `From<char>`.][79502]
2034 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2035 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2036 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2037 - [`io::Empty` now implements `io::Seek`.][78044]
2038 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2039 `T: ?Sized` types.][80764]
2040 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2046 - [`Arc::decrement_strong_count`]
2047 - [`Arc::increment_strong_count`]
2048 - [`Once::call_once_force`]
2049 - [`Peekable::next_if_eq`]
2050 - [`Peekable::next_if`]
2051 - [`Seek::stream_position`]
2052 - [`array::IntoIter`]
2053 - [`panic::panic_any`]
2055 - [`ptr::addr_of_mut!`]
2056 - [`slice::fill_with`]
2057 - [`slice::split_inclusive_mut`]
2058 - [`slice::split_inclusive`]
2059 - [`slice::strip_prefix`]
2060 - [`slice::strip_suffix`]
2061 - [`str::split_inclusive`]
2062 - [`sync::OnceState`]
2064 - [`VecDeque::range`]
2065 - [`VecDeque::range_mut`]
2069 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2070 codegen option.][cargo/9112]
2071 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2072 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2073 to avoid unifying features of dependencies where that unification could be unwanted.
2074 Such as using the same dependency with a `std` feature in a build scripts and
2075 proc-macros, while using the `no-std` feature in the final binary. See the
2076 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2081 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2082 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2083 documentation.][79642]
2085 Various improvements to intra-doc links:
2087 - [You can link to non-path primitives such as `slice`.][80181]
2088 - [You can link to associated items.][74489]
2089 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2093 - [You can now pass `--include-ignored` to tests (e.g. with
2094 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2099 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2100 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2102 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2103 for the distributed artifacts.][81521]
2104 - `armv5te-unknown-linux-gnueabi`
2105 - `sparc64-unknown-linux-gnu`
2106 - `thumbv7neon-unknown-linux-gnueabihf`
2107 - `armv7-unknown-linux-gnueabi`
2108 - `x86_64-unknown-linux-gnux32`
2109 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2114 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2116 [79135]: https://github.com/rust-lang/rust/pull/79135
2117 [74489]: https://github.com/rust-lang/rust/pull/74489
2118 [76934]: https://github.com/rust-lang/rust/pull/76934
2119 [79570]: https://github.com/rust-lang/rust/pull/79570
2120 [80181]: https://github.com/rust-lang/rust/pull/80181
2121 [79642]: https://github.com/rust-lang/rust/pull/79642
2122 [80945]: https://github.com/rust-lang/rust/pull/80945
2123 [80279]: https://github.com/rust-lang/rust/pull/80279
2124 [80053]: https://github.com/rust-lang/rust/pull/80053
2125 [79502]: https://github.com/rust-lang/rust/pull/79502
2126 [75180]: https://github.com/rust-lang/rust/pull/75180
2127 [81521]: https://github.com/rust-lang/rust/pull/81521
2128 [80968]: https://github.com/rust-lang/rust/pull/80968
2129 [80959]: https://github.com/rust-lang/rust/pull/80959
2130 [80718]: https://github.com/rust-lang/rust/pull/80718
2131 [80653]: https://github.com/rust-lang/rust/pull/80653
2132 [80579]: https://github.com/rust-lang/rust/pull/80579
2133 [79998]: https://github.com/rust-lang/rust/pull/79998
2134 [78044]: https://github.com/rust-lang/rust/pull/78044
2135 [81455]: https://github.com/rust-lang/rust/pull/81455
2136 [80764]: https://github.com/rust-lang/rust/pull/80764
2137 [80749]: https://github.com/rust-lang/rust/pull/80749
2138 [80662]: https://github.com/rust-lang/rust/pull/80662
2139 [79134]: https://github.com/rust-lang/rust/pull/79134
2140 [80966]: https://github.com/rust-lang/rust/pull/80966
2141 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2142 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2143 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2144 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2145 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2146 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2147 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2148 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2149 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2150 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2151 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2152 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2153 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2154 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2155 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2156 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2157 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2158 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2159 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2160 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2161 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2162 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2163 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2165 Version 1.50.0 (2021-02-11)
2166 ============================
2169 -----------------------
2170 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2171 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2172 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2175 -----------------------
2176 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2177 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2178 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2179 - [Dropped support for all cloudabi targets.][78439]
2181 \* Refer to Rust's [platform support page][platform-support-doc] for more
2182 information on Rust's tiered platform support.
2185 -----------------------
2187 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2188 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2189 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2190 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2191 up the same amount of space as `File`.
2197 - [`btree_map::Entry::or_insert_with_key`]
2200 - [`hash_map::Entry::or_insert_with_key`]
2204 - [`UnsafeCell::get_mut`]
2206 The following previously stable methods are now `const`.
2208 - [`IpAddr::is_ipv4`]
2209 - [`IpAddr::is_ipv6`]
2210 - [`IpAddr::is_unspecified`]
2211 - [`IpAddr::is_loopback`]
2212 - [`IpAddr::is_multicast`]
2213 - [`Ipv4Addr::octets`]
2214 - [`Ipv4Addr::is_loopback`]
2215 - [`Ipv4Addr::is_private`]
2216 - [`Ipv4Addr::is_link_local`]
2217 - [`Ipv4Addr::is_multicast`]
2218 - [`Ipv4Addr::is_broadcast`]
2219 - [`Ipv4Addr::is_documentation`]
2220 - [`Ipv4Addr::to_ipv6_compatible`]
2221 - [`Ipv4Addr::to_ipv6_mapped`]
2222 - [`Ipv6Addr::segments`]
2223 - [`Ipv6Addr::is_unspecified`]
2224 - [`Ipv6Addr::is_loopback`]
2225 - [`Ipv6Addr::is_multicast`]
2226 - [`Ipv6Addr::to_ipv4`]
2229 - [`Layout::from_size_align`]
2230 - `pow` for all integer types.
2231 - `checked_pow` for all integer types.
2232 - `saturating_pow` for all integer types.
2233 - `wrapping_pow` for all integer types.
2234 - `next_power_of_two` for all unsigned integer types.
2235 - `checked_next_power_of_two` for all unsigned integer types.
2238 -----------------------
2240 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2241 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2242 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2243 contents of that directory for changes.][cargo/8973]
2244 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2249 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2250 - [Running tests will now print the total time taken to execute.][75752]
2255 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2256 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2257 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2258 unhygenic `macro_rules!` macros.][79472]
2259 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2260 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2261 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2262 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2263 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2264 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2266 [74989]: https://github.com/rust-lang/rust/pull/74989
2267 [79261]: https://github.com/rust-lang/rust/pull/79261
2268 [79896]: https://github.com/rust-lang/rust/pull/79896
2269 [79484]: https://github.com/rust-lang/rust/pull/79484
2270 [79472]: https://github.com/rust-lang/rust/pull/79472
2271 [79270]: https://github.com/rust-lang/rust/pull/79270
2272 [79003]: https://github.com/rust-lang/rust/pull/79003
2273 [78864]: https://github.com/rust-lang/rust/pull/78864
2274 [78636]: https://github.com/rust-lang/rust/pull/78636
2275 [78439]: https://github.com/rust-lang/rust/pull/78439
2276 [78343]: https://github.com/rust-lang/rust/pull/78343
2277 [78296]: https://github.com/rust-lang/rust/pull/78296
2278 [78068]: https://github.com/rust-lang/rust/pull/78068
2279 [75752]: https://github.com/rust-lang/rust/pull/75752
2280 [74699]: https://github.com/rust-lang/rust/pull/74699
2281 [78142]: https://github.com/rust-lang/rust/pull/78142
2282 [77484]: https://github.com/rust-lang/rust/pull/77484
2283 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2284 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2285 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2286 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2287 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2288 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2289 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2290 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2291 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2292 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2293 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2294 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2295 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2296 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2297 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2298 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2299 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2300 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2301 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2302 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2303 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2304 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2305 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2306 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2307 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2308 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2309 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2310 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2311 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2312 [`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
2313 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2314 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2315 [`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
2316 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2319 Version 1.49.0 (2020-12-31)
2320 ============================
2323 -----------------------
2325 - [Unions can now implement `Drop`, and you can now have a field in a union
2326 with `ManuallyDrop<T>`.][77547]
2327 - [You can now cast uninhabited enums to integers.][76199]
2328 - [You can now bind by reference and by move in patterns.][76119] This
2329 allows you to selectively borrow individual components of a type. E.g.
2337 let person = Person {
2338 name: String::from("Alice"),
2342 // `name` is moved out of person, but `age` is referenced.
2343 let Person { name, ref age } = person;
2344 println!("{} {}", name, age);
2348 -----------------------
2350 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2351 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2352 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2353 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2354 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2355 - [Output from threads spawned in tests is now captured.][78227]
2356 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2358 \* Refer to Rust's [platform support page][platform-support-doc] for more
2359 information on Rust's tiered platform support.
2362 -----------------------
2364 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2365 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2370 - [`slice::select_nth_unstable`]
2371 - [`slice::select_nth_unstable_by`]
2372 - [`slice::select_nth_unstable_by_key`]
2374 The following previously stable methods are now `const`.
2376 - [`Poll::is_ready`]
2377 - [`Poll::is_pending`]
2380 -----------------------
2381 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2382 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2383 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2384 variable will be set if the crate being built is one the user selected to build, either
2385 with `-p` or through defaults.
2386 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2392 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2393 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2394 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2395 Previously such invalid or unused attributes could be ignored.
2396 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2397 read [this post about the changes][rustdoc-ws-post] for more details.
2398 - [Trait bounds are no longer inferred for associated types.][79904]
2402 These changes provide no direct user facing benefits, but represent significant
2403 improvements to the internals and overall performance of rustc and
2406 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2407 Local Storage model.][78201]
2408 - [Calculate visibilities once in resolve.][78077]
2409 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2410 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2413 [75991]: https://github.com/rust-lang/rust/pull/75991
2414 [78951]: https://github.com/rust-lang/rust/pull/78951
2415 [78848]: https://github.com/rust-lang/rust/pull/78848
2416 [78746]: https://github.com/rust-lang/rust/pull/78746
2417 [78376]: https://github.com/rust-lang/rust/pull/78376
2418 [78228]: https://github.com/rust-lang/rust/pull/78228
2419 [78227]: https://github.com/rust-lang/rust/pull/78227
2420 [78201]: https://github.com/rust-lang/rust/pull/78201
2421 [78109]: https://github.com/rust-lang/rust/pull/78109
2422 [78077]: https://github.com/rust-lang/rust/pull/78077
2423 [77997]: https://github.com/rust-lang/rust/pull/77997
2424 [77703]: https://github.com/rust-lang/rust/pull/77703
2425 [77547]: https://github.com/rust-lang/rust/pull/77547
2426 [77015]: https://github.com/rust-lang/rust/pull/77015
2427 [76199]: https://github.com/rust-lang/rust/pull/76199
2428 [76119]: https://github.com/rust-lang/rust/pull/76119
2429 [75914]: https://github.com/rust-lang/rust/pull/75914
2430 [79004]: https://github.com/rust-lang/rust/pull/79004
2431 [78676]: https://github.com/rust-lang/rust/pull/78676
2432 [79904]: https://github.com/rust-lang/rust/issues/79904
2433 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2434 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2435 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2436 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2437 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2438 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2439 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2440 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2441 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2442 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2444 Version 1.48.0 (2020-11-19)
2445 ==========================
2450 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2451 is still rejected *semantically*, but can now be parsed by procedural macros.
2455 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2456 `rustc` whether to link its own C runtime and libraries or to rely on a external
2457 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2458 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2459 Note: If you're using cargo you must explicitly pass the `--target` flag.
2460 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2462 \* Refer to Rust's [platform support page][platform-support-doc] for more
2463 information on Rust's tiered platform support.
2467 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2468 and `&Stderr`.][76275]
2469 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2470 - [The `matches!` macro now supports having a trailing comma.][74880]
2471 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2472 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2476 - [`slice::as_ptr_range`]
2477 - [`slice::as_mut_ptr_range`]
2478 - [`VecDeque::make_contiguous`]
2479 - [`future::pending`]
2482 The following previously stable methods are now `const fn`'s:
2484 - [`Option::is_some`]
2485 - [`Option::is_none`]
2486 - [`Option::as_ref`]
2488 - [`Result::is_err`]
2489 - [`Result::as_ref`]
2490 - [`Ordering::reverse`]
2491 - [`Ordering::then`]
2498 - [You can now link to items in `rustdoc` using the intra-doc link
2499 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2500 a link to `std::future`'s documentation. See ["Linking to items by
2501 name"][intradoc-links] for more information.
2502 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2503 when searching through `rustdoc`'s UI.][75740]
2507 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2508 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2509 promoted to `'static` lifetime any more inside `const fn`s.
2510 - [Associated type bindings on trait objects are now verified to meet the bounds
2511 declared on the trait when checking that they implement the trait.][27675]
2512 - [When trait bounds on associated types or opaque types are ambiguous, the
2513 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2514 - [Fixed recursive nonterminals not being expanded in macros during
2515 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2516 correctly handling recursive nonterminal tokens.
2517 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2518 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2519 in places where they have no effect.][73461]
2520 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2521 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2522 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2523 disallow zero-initialization.][71274]
2524 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2525 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2526 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2527 see the [`catch_unwind`] documentation for further information.
2533 These changes provide no direct user facing benefits, but represent significant
2534 improvements to the internals and overall performance of rustc and
2537 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2538 You can continue building with `make` by setting `ninja=false` in
2540 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2541 - [Made `ensure_sufficient_stack()` non-generic][76680]
2543 [78143]: https://github.com/rust-lang/rust/issues/78143
2544 [76680]: https://github.com/rust-lang/rust/pull/76680/
2545 [76030]: https://github.com/rust-lang/rust/pull/76030/
2546 [70212]: https://github.com/rust-lang/rust/pull/70212/
2547 [27675]: https://github.com/rust-lang/rust/issues/27675/
2548 [54121]: https://github.com/rust-lang/rust/issues/54121/
2549 [71274]: https://github.com/rust-lang/rust/pull/71274/
2550 [77386]: https://github.com/rust-lang/rust/pull/77386/
2551 [77153]: https://github.com/rust-lang/rust/pull/77153/
2552 [77055]: https://github.com/rust-lang/rust/pull/77055/
2553 [76275]: https://github.com/rust-lang/rust/pull/76275/
2554 [76310]: https://github.com/rust-lang/rust/pull/76310/
2555 [76420]: https://github.com/rust-lang/rust/pull/76420/
2556 [76158]: https://github.com/rust-lang/rust/pull/76158/
2557 [75857]: https://github.com/rust-lang/rust/pull/75857/
2558 [75585]: https://github.com/rust-lang/rust/pull/75585/
2559 [75740]: https://github.com/rust-lang/rust/pull/75740/
2560 [75502]: https://github.com/rust-lang/rust/pull/75502/
2561 [74880]: https://github.com/rust-lang/rust/pull/74880/
2562 [74922]: https://github.com/rust-lang/rust/pull/74922/
2563 [74430]: https://github.com/rust-lang/rust/pull/74430/
2564 [74194]: https://github.com/rust-lang/rust/pull/74194/
2565 [73461]: https://github.com/rust-lang/rust/pull/73461/
2566 [73166]: https://github.com/rust-lang/rust/pull/73166/
2567 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2568 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2569 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2570 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2571 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2572 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2573 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2574 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2575 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2576 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2577 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2578 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2579 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2580 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2581 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2584 Version 1.47.0 (2020-10-08)
2585 ==========================
2589 - [Closures will now warn when not used.][74869]
2593 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2594 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2596 - [Upgraded to LLVM 11.][73526]
2597 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2598 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2599 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2601 \* Refer to Rust's [platform support page][platform-support-doc] for more
2602 information on Rust's tiered platform support.
2606 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2607 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2608 those of length less than 33.][74060]
2609 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2610 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2611 `PartialEq`, and `PartialOrd`.][73583]
2615 - [`Ident::new_raw`]
2616 - [`Range::is_empty`]
2617 - [`RangeInclusive::is_empty`]
2618 - [`Result::as_deref`]
2619 - [`Result::as_deref_mut`]
2621 - [`pointer::offset_from`]
2625 The following previously stable APIs have now been made const.
2627 - [The `new` method for all `NonZero` integers.][73858]
2628 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2629 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2630 methods for all integers.][73858]
2631 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2632 signed integers.][73858]
2633 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2634 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2635 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2636 `is_ascii_control` methods for `char` and `u8`.][73858]
2640 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2641 You can override this by setting the following in your `Cargo.toml`.
2643 [profile.release.build-override]
2646 - [`cargo-help` will now display man pages for commands rather just the
2647 `--help` text.][cargo/8456]
2648 - [`cargo-metadata` now emits a `test` field indicating if a target has
2649 tests enabled.][cargo/8478]
2650 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2651 - [`cargo-publish` will now use an alternative registry by default if it's the
2652 only registry specified in `package.publish`.][cargo/8571]
2656 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2657 type based search.][75366]
2658 - [Added the Ayu theme to rustdoc.][71237]
2662 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2663 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2664 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2665 help to preserve more span information.][73084] These changes may cause
2666 compilation errors if your macro was unhygenic or didn't correctly handle
2668 - [Moved support for the CloudABI target to tier 3.][75568]
2669 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2670 - [Added the `rustc-docs` component.][75560] This allows you to install
2671 and read the documentation for the compiler internal APIs. (Currently only
2672 available for `x86_64-unknown-linux-gnu`.)
2677 - [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.
2679 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2680 [75048]: https://github.com/rust-lang/rust/pull/75048/
2681 [74163]: https://github.com/rust-lang/rust/pull/74163/
2682 [71237]: https://github.com/rust-lang/rust/pull/71237/
2683 [74869]: https://github.com/rust-lang/rust/pull/74869/
2684 [73858]: https://github.com/rust-lang/rust/pull/73858/
2685 [75716]: https://github.com/rust-lang/rust/pull/75716/
2686 [75560]: https://github.com/rust-lang/rust/pull/75560/
2687 [75568]: https://github.com/rust-lang/rust/pull/75568/
2688 [75366]: https://github.com/rust-lang/rust/pull/75366/
2689 [75204]: https://github.com/rust-lang/rust/pull/75204/
2690 [74650]: https://github.com/rust-lang/rust/pull/74650/
2691 [74419]: https://github.com/rust-lang/rust/pull/74419/
2692 [73964]: https://github.com/rust-lang/rust/pull/73964/
2693 [74021]: https://github.com/rust-lang/rust/pull/74021/
2694 [74060]: https://github.com/rust-lang/rust/pull/74060/
2695 [73893]: https://github.com/rust-lang/rust/pull/73893/
2696 [73526]: https://github.com/rust-lang/rust/pull/73526/
2697 [73583]: https://github.com/rust-lang/rust/pull/73583/
2698 [73084]: https://github.com/rust-lang/rust/pull/73084/
2699 [73197]: https://github.com/rust-lang/rust/pull/73197/
2700 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2701 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2702 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2703 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2704 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2705 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2706 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2707 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2708 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2709 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2710 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2711 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2712 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2713 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2716 Version 1.46.0 (2020-08-27)
2717 ==========================
2721 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2722 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2723 const functions.][73862]
2724 - [The `#[track_caller]` attribute can now be added to functions to use the
2725 function's caller's location information for panic messages.][72445]
2726 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2727 `x.0.0` over `(x.0).0`.
2728 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2729 You currently can't use `mem::transmute` in constant functions.
2733 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2734 - [Enabled static "Position Independent Executables" by default
2735 for `x86_64-unknown-linux-musl`.][70740]
2739 - [`mem::forget` is now a `const fn`.][73887]
2740 - [`String` now implements `From<char>`.][73466]
2741 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2742 integer types.][73032]
2743 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2744 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2745 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2746 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2747 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2748 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2753 - [`vec::Drain::as_slice`]
2757 Added a number of new environment variables that are now available when
2758 compiling your crate.
2760 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2761 the specific binary being compiled and the name of the crate.
2762 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2763 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2767 - [The target configuration option `abi_blacklist` has been renamed
2768 to `unsupported_abis`.][74150] The old name will still continue to work.
2769 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2770 This was previously accepted but will become a hard error in a future release.
2771 - [Rustc will fail to compile if you have a struct with
2772 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2774 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2775 ensure that spans have the correct information, and may cause breakage if you
2776 were relying on receiving spans with dummy information.
2777 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2778 a legacy installer that was replaced by a MSI installer a few years ago but
2779 was still being built.
2780 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2781 - [Rustc will no longer accept overlapping trait implementations that only
2782 differ in how the lifetime was bound.][72493]
2783 - [Rustc now correctly relates the lifetime of an existential associated
2784 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2785 you to pass a shorter lifetime than expected.
2786 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2787 The library will need to be installed for `rustc` to work, even though we
2788 expect it to be already available on most systems.
2789 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2791 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2792 exact output returned by rustc's pretty printing is an unstable
2793 implementation detail: we recommend any macro relying on it to switch to a
2794 more robust parsing system.
2796 [75453]: https://github.com/rust-lang/rust/issues/75453/
2797 [74820]: https://github.com/rust-lang/rust/issues/74820/
2798 [74420]: https://github.com/rust-lang/rust/issues/74420/
2799 [74109]: https://github.com/rust-lang/rust/pull/74109/
2800 [74150]: https://github.com/rust-lang/rust/pull/74150/
2801 [73862]: https://github.com/rust-lang/rust/pull/73862/
2802 [73887]: https://github.com/rust-lang/rust/pull/73887/
2803 [73466]: https://github.com/rust-lang/rust/pull/73466/
2804 [73516]: https://github.com/rust-lang/rust/pull/73516/
2805 [73293]: https://github.com/rust-lang/rust/pull/73293/
2806 [73007]: https://github.com/rust-lang/rust/pull/73007/
2807 [73032]: https://github.com/rust-lang/rust/pull/73032/
2808 [72920]: https://github.com/rust-lang/rust/pull/72920/
2809 [72569]: https://github.com/rust-lang/rust/pull/72569/
2810 [72583]: https://github.com/rust-lang/rust/pull/72583/
2811 [72584]: https://github.com/rust-lang/rust/pull/72584/
2812 [72717]: https://github.com/rust-lang/rust/pull/72717/
2813 [72437]: https://github.com/rust-lang/rust/pull/72437/
2814 [72445]: https://github.com/rust-lang/rust/pull/72445/
2815 [72486]: https://github.com/rust-lang/rust/pull/72486/
2816 [72493]: https://github.com/rust-lang/rust/pull/72493/
2817 [72331]: https://github.com/rust-lang/rust/pull/72331/
2818 [71896]: https://github.com/rust-lang/rust/pull/71896/
2819 [71660]: https://github.com/rust-lang/rust/pull/71660/
2820 [71322]: https://github.com/rust-lang/rust/pull/71322/
2821 [70740]: https://github.com/rust-lang/rust/pull/70740/
2822 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2823 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2824 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2825 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2826 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2829 Version 1.45.2 (2020-08-03)
2830 ==========================
2832 * [Fix bindings in tuple struct patterns][74954]
2833 * [Fix track_caller integration with trait objects][74784]
2835 [74954]: https://github.com/rust-lang/rust/issues/74954
2836 [74784]: https://github.com/rust-lang/rust/issues/74784
2839 Version 1.45.1 (2020-07-30)
2840 ==========================
2842 * [Fix const propagation with references.][73613]
2843 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2844 * [Avoid spurious implicit region bound.][74509]
2845 * [Install clippy on x.py install][74457]
2847 [73613]: https://github.com/rust-lang/rust/pull/73613
2848 [73078]: https://github.com/rust-lang/rust/issues/73078
2849 [74509]: https://github.com/rust-lang/rust/pull/74509
2850 [74457]: https://github.com/rust-lang/rust/pull/74457
2853 Version 1.45.0 (2020-07-16)
2854 ==========================
2858 - [Out of range float to int conversions using `as` has been defined as a saturating
2859 conversion.][71269] This was previously undefined behaviour, but you can use the
2860 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2861 may be desirable in rare performance sensitive situations.
2862 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2863 using `u64`.][70705]
2864 - [Function like procedural macros can now be used in expression, pattern, and statement
2865 positions.][68717] This means you can now use a function-like procedural macro
2866 anywhere you can use a declarative (`macro_rules!`) macro.
2870 - [You can now override individual target features through the `target-feature`
2871 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2872 equivalent to `-C target-feature=+avx2,+fma`.
2873 - [Added the `force-unwind-tables` flag.][69984] This option allows
2874 rustc to always generate unwind tables regardless of panic strategy.
2875 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2876 to include LLVM bitcode into generated `rlib`s (this is on by default).
2877 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2878 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2879 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2880 - [Upgraded to LLVM 10.][67759]
2882 \* Refer to Rust's [platform support page][platform-support-doc] for more
2883 information on Rust's tiered platform support.
2888 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2890 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2891 - [You can now use `char` with
2892 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2893 a range of codepoints.][72413] E.g.
2894 you can now write the following;
2896 for ch in 'a'..='z' {
2900 // Prints "abcdefghijklmnopqrstuvwxyz"
2902 - [`OsString` now implements `FromStr`.][71662]
2903 - [The `saturating_neg` method has been added to all signed integer primitive
2904 types, and the `saturating_abs` method has been added for all integer
2905 primitive types.][71886]
2906 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2907 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2909 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2910 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2911 integer types.][69813]
2912 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2913 integer types.][72324]
2914 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2919 - [`BTreeMap::remove_entry`]
2921 - [`rc::Weak::as_ptr`]
2922 - [`rc::Weak::from_raw`]
2923 - [`rc::Weak::into_raw`]
2924 - [`str::strip_prefix`]
2925 - [`str::strip_suffix`]
2926 - [`sync::Weak::as_ptr`]
2927 - [`sync::Weak::from_raw`]
2928 - [`sync::Weak::into_raw`]
2929 - [`char::UNICODE_VERSION`]
2930 - [`Span::resolved_at`]
2931 - [`Span::located_at`]
2932 - [`Span::mixed_site`]
2933 - [`unix::process::CommandExt::arg0`]
2938 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2943 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2944 `~~outdated information~~` becomes "~~outdated information~~".
2945 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2949 - [Trying to self initialize a static value (that is creating a value using
2950 itself) is unsound and now causes a compile error.][71140]
2951 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2952 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2953 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2954 previously undocumented and not intended for public use. Rustdoc still provides
2955 a non-zero exit code on errors.
2956 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2957 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2958 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2959 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2960 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2964 - [Make clippy a git subtree instead of a git submodule][70655]
2965 - [Unify the undo log of all snapshot types][69464]
2967 [71848]: https://github.com/rust-lang/rust/issues/71848/
2968 [73420]: https://github.com/rust-lang/rust/issues/73420/
2969 [72324]: https://github.com/rust-lang/rust/pull/72324/
2970 [71843]: https://github.com/rust-lang/rust/pull/71843/
2971 [71886]: https://github.com/rust-lang/rust/pull/71886/
2972 [72234]: https://github.com/rust-lang/rust/pull/72234/
2973 [72239]: https://github.com/rust-lang/rust/pull/72239/
2974 [72397]: https://github.com/rust-lang/rust/pull/72397/
2975 [72413]: https://github.com/rust-lang/rust/pull/72413/
2976 [72014]: https://github.com/rust-lang/rust/pull/72014/
2977 [72062]: https://github.com/rust-lang/rust/pull/72062/
2978 [72094]: https://github.com/rust-lang/rust/pull/72094/
2979 [72133]: https://github.com/rust-lang/rust/pull/72133/
2980 [67759]: https://github.com/rust-lang/rust/pull/67759/
2981 [71900]: https://github.com/rust-lang/rust/pull/71900/
2982 [71928]: https://github.com/rust-lang/rust/pull/71928/
2983 [71662]: https://github.com/rust-lang/rust/pull/71662/
2984 [71716]: https://github.com/rust-lang/rust/pull/71716/
2985 [71447]: https://github.com/rust-lang/rust/pull/71447/
2986 [71269]: https://github.com/rust-lang/rust/pull/71269/
2987 [71095]: https://github.com/rust-lang/rust/pull/71095/
2988 [71140]: https://github.com/rust-lang/rust/pull/71140/
2989 [70655]: https://github.com/rust-lang/rust/pull/70655/
2990 [70705]: https://github.com/rust-lang/rust/pull/70705/
2991 [69984]: https://github.com/rust-lang/rust/pull/69984/
2992 [69813]: https://github.com/rust-lang/rust/pull/69813/
2993 [69464]: https://github.com/rust-lang/rust/pull/69464/
2994 [68717]: https://github.com/rust-lang/rust/pull/68717/
2995 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2996 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2997 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2998 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2999 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3000 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3001 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3002 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3003 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3004 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3005 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3006 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3007 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3008 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3009 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3010 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3011 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3014 Version 1.44.1 (2020-06-18)
3015 ===========================
3017 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3018 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3019 * [Fix crashes when finding backtrace on macOS.][71397]
3020 * [Clippy applies lint levels into different files.][clippy/5356]
3022 [71397]: https://github.com/rust-lang/rust/issues/71397
3023 [73078]: https://github.com/rust-lang/rust/issues/73078
3024 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3025 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3028 Version 1.44.0 (2020-06-04)
3029 ==========================
3033 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3034 - [Added the `unused_braces` lint.][70081]
3036 **Syntax-only changes**
3038 - [Expansion-driven outline module parsing][69838]
3043 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3048 These are still rejected semantically, so you will likely receive an error but
3049 these changes can be seen and parsed by macros and conditional compilation.
3053 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3054 Additionally when in incremental mode rustc defaults to 256 codegen units.
3055 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3056 a panic is thrown.][67502]
3057 - [Added tier 3\* support for the `aarch64-unknown-none` and
3058 `aarch64-unknown-none-softfloat` targets.][68334]
3059 - [Added tier 3 support for `arm64-apple-tvos` and
3060 `x86_64-apple-tvos` targets.][68191]
3065 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3066 `vec![]` to be able to be used in `const` contexts.
3067 - [`convert::Infallible` now implements `Hash`.][70281]
3068 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3069 a `&mut OsStr`.][70048]
3070 - [Unicode 13 is now supported.][69929]
3071 - [`String` now implements `From<&mut str>`.][69661]
3072 - [`IoSlice` now implements `Copy`.][69403]
3073 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3074 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3075 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3076 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3077 integer types.][69373]
3081 - [`PathBuf::with_capacity`]
3082 - [`PathBuf::capacity`]
3083 - [`PathBuf::clear`]
3084 - [`PathBuf::reserve`]
3085 - [`PathBuf::reserve_exact`]
3086 - [`PathBuf::shrink_to_fit`]
3087 - [`f32::to_int_unchecked`]
3088 - [`f64::to_int_unchecked`]
3089 - [`Layout::align_to`]
3090 - [`Layout::pad_to_align`]
3092 - [`Layout::extend`]
3096 - [Added the `cargo tree` command which will print a tree graph of
3097 your dependencies.][cargo/8062] E.g.
3099 mdbook v0.3.2 (/Users/src/rust/mdbook)
3101 │ ├── html5ever v0.24.0
3103 │ │ │ └── cfg-if v0.1.9
3105 │ │ └── markup5ever v0.9.0
3106 │ │ ├── log v0.4.8 (*)
3108 │ │ │ └── phf_shared v0.7.24
3109 │ │ │ ├── siphasher v0.2.3
3110 │ │ │ └── unicase v1.4.2
3111 │ │ │ [build-dependencies]
3112 │ │ │ └── version_check v0.1.5
3115 You can also display dependencies on multiple versions of the same crate with
3116 `cargo tree -d` (short for `cargo tree --duplicates`).
3120 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3121 the version in the sidebar.][69494]
3125 - [Rustc now correctly generates static libraries on Windows GNU targets with
3126 the `.a` extension, rather than the previous `.lib`.][70937]
3127 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3128 - [The `file_name` property in JSON output of macro errors now points the actual
3129 source file rather than the previous format of `<NAME macros>`.][70969]
3130 **Note:** this may not point to a file that actually exists on the user's system.
3131 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3132 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3133 not allow zero initialization such as `NonZeroU8`.][66059] This was
3134 previously a warning.
3135 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3136 operator has been defined as a saturating operation.][71269] This was previously
3137 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3138 continue using the current behaviour, which may be desirable in rare performance
3139 sensitive situations.
3143 These changes provide no direct user facing benefits, but represent significant
3144 improvements to the internals and overall performance of rustc and
3147 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3148 - [Replace big JS dict with JSON parsing.][71250]
3150 [69373]: https://github.com/rust-lang/rust/pull/69373/
3151 [66059]: https://github.com/rust-lang/rust/pull/66059/
3152 [68191]: https://github.com/rust-lang/rust/pull/68191/
3153 [68899]: https://github.com/rust-lang/rust/pull/68899/
3154 [71147]: https://github.com/rust-lang/rust/pull/71147/
3155 [71250]: https://github.com/rust-lang/rust/pull/71250/
3156 [70937]: https://github.com/rust-lang/rust/pull/70937/
3157 [70969]: https://github.com/rust-lang/rust/pull/70969/
3158 [70632]: https://github.com/rust-lang/rust/pull/70632/
3159 [70281]: https://github.com/rust-lang/rust/pull/70281/
3160 [70345]: https://github.com/rust-lang/rust/pull/70345/
3161 [70048]: https://github.com/rust-lang/rust/pull/70048/
3162 [70081]: https://github.com/rust-lang/rust/pull/70081/
3163 [70156]: https://github.com/rust-lang/rust/pull/70156/
3164 [71269]: https://github.com/rust-lang/rust/pull/71269/
3165 [69838]: https://github.com/rust-lang/rust/pull/69838/
3166 [69929]: https://github.com/rust-lang/rust/pull/69929/
3167 [69661]: https://github.com/rust-lang/rust/pull/69661/
3168 [69778]: https://github.com/rust-lang/rust/pull/69778/
3169 [69494]: https://github.com/rust-lang/rust/pull/69494/
3170 [69403]: https://github.com/rust-lang/rust/pull/69403/
3171 [69033]: https://github.com/rust-lang/rust/pull/69033/
3172 [68692]: https://github.com/rust-lang/rust/pull/68692/
3173 [68334]: https://github.com/rust-lang/rust/pull/68334/
3174 [67502]: https://github.com/rust-lang/rust/pull/67502/
3175 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3176 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3177 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3178 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3179 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3180 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3181 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3182 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3183 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3184 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3185 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3186 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3187 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3190 Version 1.43.1 (2020-05-07)
3191 ===========================
3193 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3194 * [Fixed the stabilization of AVX-512 features.][71473]
3195 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3197 [71430]: https://github.com/rust-lang/rust/pull/71430
3198 [71473]: https://github.com/rust-lang/rust/issues/71473
3199 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3202 Version 1.43.0 (2020-04-23)
3203 ==========================
3207 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3208 the type inferred correctly.][68129]
3209 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3211 **Syntax only changes**
3212 - [Allow `type Foo: Ord` syntactically.][69361]
3213 - [Fuse associated and extern items up to defaultness.][69194]
3214 - [Syntactically allow `self` in all `fn` contexts.][68764]
3215 - [Merge `fn` syntax + cleanup item parsing.][68728]
3216 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3217 For example, you may now write:
3219 macro_rules! mac_trait {
3229 These are still rejected *semantically*, so you will likely receive an error but
3230 these changes can be seen and parsed by macros and
3231 conditional compilation.
3236 - [You can now pass multiple lint flags to rustc to override the previous
3237 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3238 everything in the `unused` lint group except `unused-variables` which
3239 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3240 everything in the `unused` lint group **including** `unused-variables` since
3241 the allow flag is specified before the deny flag (and therefore overridden).
3242 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3243 if they are available on `windows-gnu`.][67429]
3244 - [rustc now buffers errors/warnings printed in JSON.][69227]
3248 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3249 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3250 respectively.][69538] **Note** These conversions are only available when `N`
3252 - [You can now use associated constants on floats and integers directly, rather
3253 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3254 `f32::NAN` with no imports.
3255 - [`u8::is_ascii` is now `const`.][68984]
3256 - [`String` now implements `AsMut<str>`.][68742]
3257 - [Added the `primitive` module to `std` and `core`.][67637] This module
3258 reexports Rust's primitive types. This is mainly useful in macros
3259 where you want avoid these types being shadowed.
3260 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3261 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3265 - [`Once::is_completed`]
3270 - [`iter::once_with`]
3274 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3275 your environment.][cargo/7823]
3276 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3277 executable path when running integration tests or benchmarks.][cargo/7697]
3278 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3279 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3283 - [Certain checks in the `const_err` lint were deemed unrelated to const
3284 evaluation][69185], and have been moved to the `unconditional_panic` and
3285 `arithmetic_overflow` lints.
3290 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3291 has been a warning since 1.36.0.
3292 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3293 led to some instances being accepted, and now correctly emits a hard error.
3295 [69340]: https://github.com/rust-lang/rust/pull/69340
3299 These changes provide no direct user facing benefits, but represent significant
3300 improvements to the internals and overall performance of `rustc` and
3303 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3304 - [Improved how rustc generates drop code.][67332]
3305 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3306 - [traits: preallocate 2 Vecs of known initial size][69022]
3307 - [Avoid exponential behaviour when relating types][68772]
3308 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3309 - [Improve performance of coherence checks][68966]
3310 - [Deduplicate types in the generator witness][68672]
3311 - [Invert control in struct_lint_level.][68725]
3313 [67332]: https://github.com/rust-lang/rust/pull/67332/
3314 [67429]: https://github.com/rust-lang/rust/pull/67429/
3315 [67637]: https://github.com/rust-lang/rust/pull/67637/
3316 [67642]: https://github.com/rust-lang/rust/pull/67642/
3317 [67878]: https://github.com/rust-lang/rust/pull/67878/
3318 [67885]: https://github.com/rust-lang/rust/pull/67885/
3319 [68129]: https://github.com/rust-lang/rust/pull/68129/
3320 [68672]: https://github.com/rust-lang/rust/pull/68672/
3321 [68725]: https://github.com/rust-lang/rust/pull/68725/
3322 [68728]: https://github.com/rust-lang/rust/pull/68728/
3323 [68738]: https://github.com/rust-lang/rust/pull/68738/
3324 [68742]: https://github.com/rust-lang/rust/pull/68742/
3325 [68764]: https://github.com/rust-lang/rust/pull/68764/
3326 [68772]: https://github.com/rust-lang/rust/pull/68772/
3327 [68943]: https://github.com/rust-lang/rust/pull/68943/
3328 [68952]: https://github.com/rust-lang/rust/pull/68952/
3329 [68966]: https://github.com/rust-lang/rust/pull/68966/
3330 [68984]: https://github.com/rust-lang/rust/pull/68984/
3331 [69022]: https://github.com/rust-lang/rust/pull/69022/
3332 [69185]: https://github.com/rust-lang/rust/pull/69185/
3333 [69194]: https://github.com/rust-lang/rust/pull/69194/
3334 [69201]: https://github.com/rust-lang/rust/pull/69201/
3335 [69227]: https://github.com/rust-lang/rust/pull/69227/
3336 [69548]: https://github.com/rust-lang/rust/pull/69548/
3337 [69256]: https://github.com/rust-lang/rust/pull/69256/
3338 [69361]: https://github.com/rust-lang/rust/pull/69361/
3339 [69366]: https://github.com/rust-lang/rust/pull/69366/
3340 [69538]: https://github.com/rust-lang/rust/pull/69538/
3341 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3342 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3343 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3344 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3345 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3346 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3347 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3348 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3351 Version 1.42.0 (2020-03-12)
3352 ==========================
3356 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3358 fn foo(words: &[&str]) {
3360 ["Hello", "World", "!", ..] => println!("Hello World!"),
3361 ["Foo", "Bar", ..] => println!("Baz"),
3362 rest => println!("{:?}", rest),
3366 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3367 that you can create an enum that has the exact layout and ABI of the type
3369 - [You can now use outer attribute procedural macros on inline modules.][64273]
3370 - [There are some *syntax-only* changes:][67131]
3371 - `default` is syntactically allowed before items in `trait` definitions.
3372 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3373 leave out their bodies in favor of `;`.
3374 - Bounds on associated types in `impl`s are now syntactically allowed
3375 (e.g. `type Foo: Ord;`).
3376 - `...` (the C-variadic type) may occur syntactically directly as the type of
3377 any function parameter.
3379 These are still rejected *semantically*, so you will likely receive an error
3380 but these changes can be seen and parsed by procedural macros and
3381 conditional compilation.
3385 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3386 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3387 - [`Option::{expect,unwrap}` and
3388 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3389 pointing to the location where they were called, rather than
3390 `core`'s internals. ][67887]
3392 \* Refer to Rust's [platform support page][platform-support-doc] for more
3393 information on Rust's tiered platform support.
3397 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3398 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3399 to implement `Sized`.][67935]
3400 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3401 - [`Layout::new` is now `const`.][66254]
3402 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3407 - [`CondVar::wait_while`]
3408 - [`CondVar::wait_timeout_while`]
3410 - [`DebugMap::value`]
3411 - [`ManuallyDrop::take`]
3413 - [`ptr::slice_from_raw_parts_mut`]
3414 - [`ptr::slice_from_raw_parts`]
3418 - [You no longer need to include `extern crate proc_macro;` to be able to
3419 `use proc_macro;` in the `2018` edition.][cargo/7700]
3423 - [`Error::description` has been deprecated, and its use will now produce a
3424 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3426 [68253]: https://github.com/rust-lang/rust/pull/68253/
3427 [68348]: https://github.com/rust-lang/rust/pull/68348/
3428 [67935]: https://github.com/rust-lang/rust/pull/67935/
3429 [68339]: https://github.com/rust-lang/rust/pull/68339/
3430 [68122]: https://github.com/rust-lang/rust/pull/68122/
3431 [64273]: https://github.com/rust-lang/rust/pull/64273/
3432 [67712]: https://github.com/rust-lang/rust/pull/67712/
3433 [67887]: https://github.com/rust-lang/rust/pull/67887/
3434 [67131]: https://github.com/rust-lang/rust/pull/67131/
3435 [67233]: https://github.com/rust-lang/rust/pull/67233/
3436 [66899]: https://github.com/rust-lang/rust/pull/66899/
3437 [66919]: https://github.com/rust-lang/rust/pull/66919/
3438 [66254]: https://github.com/rust-lang/rust/pull/66254/
3439 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3440 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3441 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3442 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3443 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3444 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3445 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3446 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3447 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3450 Version 1.41.1 (2020-02-27)
3451 ===========================
3453 * [Always check types of static items][69145]
3454 * [Always check lifetime bounds of `Copy` impls][69145]
3455 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3457 [69225]: https://github.com/rust-lang/rust/issues/69225
3458 [69145]: https://github.com/rust-lang/rust/pull/69145
3461 Version 1.41.0 (2020-01-30)
3462 ===========================
3467 - [You can now pass type parameters to foreign items when implementing
3468 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3469 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3470 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3471 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3472 - [You can now use any valid identifier in a `format_args` macro.][66847]
3473 Previously identifiers starting with an underscore were not allowed.
3474 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3475 enum variants.][66183] These are still rejected semantically, but
3476 can be seen and parsed by procedural macros and conditional compilation.
3477 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3478 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3479 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3481 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3486 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3487 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3488 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3489 - [You can now pass an arguments file passing the `@path` syntax
3490 to rustc.][66172] Note that the format differs somewhat from what is
3491 found in other tooling; please see [the documentation][argfile-docs] for
3493 - [You can now provide `--extern` flag without a path, indicating that it is
3494 available from the search path or specified with an `-L` flag.][64882]
3496 \* Refer to Rust's [platform support page][platform-support-doc] for more
3497 information on Rust's tiered platform support.
3499 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3504 - [The `core::panic` module is now stable.][66771] It was already stable
3506 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3507 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3508 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3513 - [`Result::map_or`]
3514 - [`Result::map_or_else`]
3515 - [`std::rc::Weak::weak_count`]
3516 - [`std::rc::Weak::strong_count`]
3517 - [`std::sync::Weak::weak_count`]
3518 - [`std::sync::Weak::strong_count`]
3523 - [Cargo will now document all the private items for binary crates
3524 by default.][cargo/7593]
3525 - [`cargo-install` will now reinstall the package if it detects that it is out
3526 of date.][cargo/7560]
3527 - [Cargo.lock now uses a more git friendly format that should help to reduce
3528 merge conflicts.][cargo/7579]
3529 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3530 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3531 optimisation level to `2` for debug builds. You can also use
3532 `[profile.<profile>.build-override]` to override build scripts and
3538 - [You can now specify `edition` in documentation code blocks to compile the block
3539 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3540 should be compiled the 2018 edition of Rust.
3541 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3542 current theme with `--check-theme`.][54733]
3543 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3548 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3549 Apple targets.][apple-32bit-drop] This means that the source code is still
3550 available to build, but the targets are no longer being tested and release
3551 binaries for those platforms will no longer be distributed by the Rust project.
3552 Please refer to the linked blog post for more information.
3554 [54733]: https://github.com/rust-lang/rust/pull/54733/
3555 [61351]: https://github.com/rust-lang/rust/pull/61351/
3556 [62514]: https://github.com/rust-lang/rust/pull/62514/
3557 [67255]: https://github.com/rust-lang/rust/pull/67255/
3558 [66661]: https://github.com/rust-lang/rust/pull/66661/
3559 [66771]: https://github.com/rust-lang/rust/pull/66771/
3560 [66847]: https://github.com/rust-lang/rust/pull/66847/
3561 [66238]: https://github.com/rust-lang/rust/pull/66238/
3562 [66277]: https://github.com/rust-lang/rust/pull/66277/
3563 [66325]: https://github.com/rust-lang/rust/pull/66325/
3564 [66172]: https://github.com/rust-lang/rust/pull/66172/
3565 [66183]: https://github.com/rust-lang/rust/pull/66183/
3566 [65879]: https://github.com/rust-lang/rust/pull/65879/
3567 [65013]: https://github.com/rust-lang/rust/pull/65013/
3568 [64882]: https://github.com/rust-lang/rust/pull/64882/
3569 [64325]: https://github.com/rust-lang/rust/pull/64325/
3570 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3571 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3572 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3573 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3574 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3575 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3576 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3577 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3578 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3579 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3580 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3582 Version 1.40.0 (2019-12-19)
3583 ===========================
3587 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3588 `const` contexts.][65188] e.g.
3591 pub struct Point(i32, i32);
3593 const ORIGIN: Point = {
3594 let constructor = Point;
3600 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3601 indicate that there may be variants or fields added in the future.][64639]
3602 For example this requires adding a wild-card branch (`_ => {}`) to any match
3603 statements on a non-exhaustive `enum`. [(RFC 2008)]
3604 - [You can now use function-like procedural macros in `extern` blocks and in
3605 type positions.][63931] e.g. `type Generated = macro!();`
3606 - [Function-like and attribute procedural macros can now emit
3607 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3608 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3609 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3610 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3614 - [Added tier 3 support\* for the
3615 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3616 - [Added tier 3 support for the
3617 `aarch64-unknown-none-softfloat` target.][64589]
3618 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3619 `mips64el-unknown-linux-muslabi64` targets.][65843]
3621 \* Refer to Rust's [platform support page][platform-support-doc] for more
3622 information on Rust's tiered platform support.
3626 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3630 - [`BTreeMap::get_key_value`]
3631 - [`HashMap::get_key_value`]
3632 - [`Option::as_deref_mut`]
3633 - [`Option::as_deref`]
3634 - [`Option::flatten`]
3635 - [`UdpSocket::peer_addr`]
3636 - [`f32::to_be_bytes`]
3637 - [`f32::to_le_bytes`]
3638 - [`f32::to_ne_bytes`]
3639 - [`f64::to_be_bytes`]
3640 - [`f64::to_le_bytes`]
3641 - [`f64::to_ne_bytes`]
3642 - [`f32::from_be_bytes`]
3643 - [`f32::from_le_bytes`]
3644 - [`f32::from_ne_bytes`]
3645 - [`f64::from_be_bytes`]
3646 - [`f64::from_le_bytes`]
3647 - [`f64::from_ne_bytes`]
3654 - [Cargo will now always display warnings, rather than only on
3655 fresh builds.][cargo/7450]
3656 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3657 now produce an error.][cargo/7507] Previously these flags were ignored.
3658 - [You can now publish `dev-dependencies` without including
3659 a `version`.][cargo/7333]
3663 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3664 when running documentation tests with `rustdoc`.][63803]
3668 - [As previously announced, any previous NLL warnings in the 2015 edition are
3669 now hard errors.][64221]
3670 - [The `include!` macro will now warn if it failed to include the
3671 entire file.][64284] The `include!` macro unintentionally only includes the
3672 first _expression_ in a file, and this can be unintuitive. This will become
3673 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3674 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3675 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3676 or `extern` blocks now correctly emits a hard error.
3678 [65294]: https://github.com/rust-lang/rust/pull/65294/
3679 [66103]: https://github.com/rust-lang/rust/pull/66103/
3680 [65843]: https://github.com/rust-lang/rust/pull/65843/
3681 [65188]: https://github.com/rust-lang/rust/pull/65188/
3682 [65092]: https://github.com/rust-lang/rust/pull/65092/
3683 [64589]: https://github.com/rust-lang/rust/pull/64589/
3684 [64639]: https://github.com/rust-lang/rust/pull/64639/
3685 [64221]: https://github.com/rust-lang/rust/pull/64221/
3686 [64284]: https://github.com/rust-lang/rust/pull/64284/
3687 [63931]: https://github.com/rust-lang/rust/pull/63931/
3688 [64035]: https://github.com/rust-lang/rust/pull/64035/
3689 [63674]: https://github.com/rust-lang/rust/pull/63674/
3690 [63803]: https://github.com/rust-lang/rust/pull/63803/
3691 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3692 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3693 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3694 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3695 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3696 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3697 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3698 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3699 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3700 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3701 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3702 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3703 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3704 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3705 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3706 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3707 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3708 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3709 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3710 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3711 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3712 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3713 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3714 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3715 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3718 Version 1.39.0 (2019-11-07)
3719 ===========================
3723 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3724 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3725 - [You can now use certain attributes on function, closure, and function pointer
3726 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3727 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3728 attributes applied to items. e.g.
3731 #[cfg(windows)] slice: &[u16],
3732 #[cfg(not(windows))] slice: &[u8],
3737 - [You can now take shared references to bind-by-move patterns in the `if` guards
3738 of `match` arms.][63118] e.g.
3741 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3745 // ---- `nums` is bound by move.
3746 if nums.iter().sum::<u8>() == 10
3747 // ^------ `.iter()` implicitly takes a reference to `nums`.
3750 // ----------- Legal as `nums` was bound by move and so we have ownership.
3752 _ => unreachable!(),
3761 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3762 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3763 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3764 **Note** Cargo currently doesn't use this feature. Refer to
3765 [cargo#7315][cargo/7315] to track this feature's progress.
3766 - [You can now pass `--show-output` argument to test binaries to print the
3767 output of successful tests.][62600]
3770 \* Refer to Rust's [platform support page][platform-support-doc] for more
3771 information on Rust's tiered platform support.
3775 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3776 - [`LinkedList::new` is now a `const` function.][63684]
3777 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3778 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3779 now `const`.][63786]
3783 - [`Pin::into_inner`]
3784 - [`Instant::checked_duration_since`]
3785 - [`Instant::saturating_duration_since`]
3789 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3790 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3791 `--all` is now deprecated.
3795 - [You can now pass `-Clinker` to rustdoc to control the linker used
3796 for compiling doctests.][63834]
3800 - [Code that was previously accepted by the old borrow checker, but rejected by
3801 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3802 previously a warning, and will also become a hard error in the Rust 2015
3803 edition in the 1.40.0 release.
3804 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3805 run tests.][63827] This should improve performance when running a large
3807 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3808 recommended to use the `?` operator instead.
3809 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3812 [62600]: https://github.com/rust-lang/rust/pull/62600/
3813 [62672]: https://github.com/rust-lang/rust/pull/62672/
3814 [63118]: https://github.com/rust-lang/rust/pull/63118/
3815 [63209]: https://github.com/rust-lang/rust/pull/63209/
3816 [63402]: https://github.com/rust-lang/rust/pull/63402/
3817 [63565]: https://github.com/rust-lang/rust/pull/63565/
3818 [63595]: https://github.com/rust-lang/rust/pull/63595/
3819 [63684]: https://github.com/rust-lang/rust/pull/63684/
3820 [63698]: https://github.com/rust-lang/rust/pull/63698/
3821 [63770]: https://github.com/rust-lang/rust/pull/63770/
3822 [63786]: https://github.com/rust-lang/rust/pull/63786/
3823 [63827]: https://github.com/rust-lang/rust/pull/63827/
3824 [63834]: https://github.com/rust-lang/rust/pull/63834/
3825 [64010]: https://github.com/rust-lang/rust/pull/64010/
3826 [64028]: https://github.com/rust-lang/rust/pull/64028/
3827 [64334]: https://github.com/rust-lang/rust/pull/64334/
3828 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3829 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3830 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3831 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3832 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3833 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3835 Version 1.38.0 (2019-09-26)
3836 ==========================
3840 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3841 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3845 - [Added pipelined compilation support to `rustc`.][62766] This will
3846 improve compilation times in some cases. For further information please refer
3847 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3848 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3849 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3850 `x86_64-uwp-windows-msvc` targets.][60260]
3851 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3852 `armv7-unknown-linux-musleabi` targets.][63107]
3853 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3854 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3855 - [Upgraded to LLVM 9.][62592]
3857 \* Refer to Rust's [platform support page][platform-support-doc] for more
3858 information on Rust's tiered platform support.
3862 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3863 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3864 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3865 is available at `std::clone::Clone`). This also makes all built-in macros
3866 available in `std`/`core` root. e.g. `std::include_bytes!`.
3867 - [`str::Chars` now implements `Debug`.][63000]
3868 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3869 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3870 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3871 - [Added euclidean remainder and division operations (`div_euclid`,
3872 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3873 `overflowing`, and `wrapping` versions are available for all
3875 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3876 `PartialEq`.][61491]
3877 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3881 - [`<*const T>::cast`]
3882 - [`<*mut T>::cast`]
3883 - [`Duration::as_secs_f32`]
3884 - [`Duration::as_secs_f64`]
3885 - [`Duration::div_f32`]
3886 - [`Duration::div_f64`]
3887 - [`Duration::from_secs_f32`]
3888 - [`Duration::from_secs_f64`]
3889 - [`Duration::mul_f32`]
3890 - [`Duration::mul_f64`]
3891 - [`any::type_name`]
3895 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3896 - [You can now pass the `--features` option multiple times to enable
3897 multiple features.][cargo/7084]
3902 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3906 - [`rustc` will now warn about some incorrect uses of
3907 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3911 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3913 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3914 issues][62896] with certain crates such as libc.
3916 [60260]: https://github.com/rust-lang/rust/pull/60260/
3917 [61457]: https://github.com/rust-lang/rust/pull/61457/
3918 [61491]: https://github.com/rust-lang/rust/pull/61491/
3919 [61884]: https://github.com/rust-lang/rust/pull/61884/
3920 [61953]: https://github.com/rust-lang/rust/pull/61953/
3921 [62042]: https://github.com/rust-lang/rust/pull/62042/
3922 [62528]: https://github.com/rust-lang/rust/pull/62528/
3923 [62583]: https://github.com/rust-lang/rust/pull/62583/
3924 [62735]: https://github.com/rust-lang/rust/pull/62735/
3925 [62766]: https://github.com/rust-lang/rust/pull/62766/
3926 [62784]: https://github.com/rust-lang/rust/pull/62784/
3927 [62592]: https://github.com/rust-lang/rust/pull/62592/
3928 [62785]: https://github.com/rust-lang/rust/issues/62785/
3929 [62814]: https://github.com/rust-lang/rust/pull/62814/
3930 [62896]: https://github.com/rust-lang/rust/issues/62896/
3931 [63000]: https://github.com/rust-lang/rust/pull/63000/
3932 [63056]: https://github.com/rust-lang/rust/pull/63056/
3933 [63107]: https://github.com/rust-lang/rust/pull/63107/
3934 [63346]: https://github.com/rust-lang/rust/pull/63346/
3935 [63421]: https://github.com/rust-lang/rust/pull/63421/
3936 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3937 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3938 [63048]: https://github.com/rust-lang/rust/pull/63048
3939 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3940 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3941 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3942 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3943 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3944 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3945 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3946 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3947 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3948 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3949 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3950 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3951 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3953 Version 1.37.0 (2019-08-15)
3954 ==========================
3958 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3959 [`Box`][62228], or an [array][62235] and unused.
3960 - [You can now use the `cfg` and `cfg_attr` attributes on
3961 generic parameters.][61547]
3962 - [You can now use enum variants through type alias.][61682] e.g. You can
3963 write the following:
3965 type MyOption = Option<u8>;
3967 fn increment_or_zero(x: MyOption) -> u8 {
3969 MyOption::Some(y) => y + 1,
3970 MyOption::None => 0,
3974 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3975 `const _: u32 = 5;`.
3976 - [You can now use `#[repr(align(X)]` on enums.][61229]
3977 - [The `?` Kleene macro operator is now available in the
3978 2015 edition.][60932]
3982 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3983 and `-C profile-use` flags.][61268] For more information on how to use profile
3984 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3985 - [The `rust-lldb` wrapper script should now work again.][61827]
3989 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3993 - [`BufReader::buffer`]
3994 - [`BufWriter::buffer`]
3995 - [`Cell::from_mut`]
3996 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3997 - [`DoubleEndedIterator::nth_back`]
3999 - [`Wrapping::reverse_bits`]
4000 - [`i128::reverse_bits`]
4001 - [`i16::reverse_bits`]
4002 - [`i32::reverse_bits`]
4003 - [`i64::reverse_bits`]
4004 - [`i8::reverse_bits`]
4005 - [`isize::reverse_bits`]
4006 - [`slice::copy_within`]
4007 - [`u128::reverse_bits`]
4008 - [`u16::reverse_bits`]
4009 - [`u32::reverse_bits`]
4010 - [`u64::reverse_bits`]
4011 - [`u8::reverse_bits`]
4012 - [`usize::reverse_bits`]
4016 - [`Cargo.lock` files are now included by default when publishing executable crates
4017 with executables.][cargo/7026]
4018 - [You can now specify `default-run="foo"` in `[package]` to specify the
4019 default executable to use for `cargo run`.][cargo/7056]
4026 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4027 Please transition your code to using the `..=` syntax for inclusive
4029 - [Using a trait object without the `dyn` will now warn by default.][61203]
4030 Please transition your code to use `dyn Trait` for trait objects instead.
4032 [62228]: https://github.com/rust-lang/rust/pull/62228/
4033 [62235]: https://github.com/rust-lang/rust/pull/62235/
4034 [61802]: https://github.com/rust-lang/rust/pull/61802/
4035 [61827]: https://github.com/rust-lang/rust/pull/61827/
4036 [61547]: https://github.com/rust-lang/rust/pull/61547/
4037 [61682]: https://github.com/rust-lang/rust/pull/61682/
4038 [61268]: https://github.com/rust-lang/rust/pull/61268/
4039 [61342]: https://github.com/rust-lang/rust/pull/61342/
4040 [61347]: https://github.com/rust-lang/rust/pull/61347/
4041 [61100]: https://github.com/rust-lang/rust/pull/61100/
4042 [61203]: https://github.com/rust-lang/rust/pull/61203/
4043 [61229]: https://github.com/rust-lang/rust/pull/61229/
4044 [60932]: https://github.com/rust-lang/rust/pull/60932/
4045 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4046 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4047 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4048 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4049 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4050 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4051 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4052 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4053 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4054 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4055 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4056 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4057 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4058 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4059 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4060 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4061 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4062 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4063 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4064 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4065 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4066 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4067 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4070 Version 1.36.0 (2019-07-04)
4071 ==========================
4075 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4076 - [The order of traits in trait objects no longer affects the semantics of that
4077 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4078 `dyn fmt::Debug + Send`, where this was previously not the case.
4082 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4083 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4084 - [`mem::needs_drop` is now available as a const fn.][60364]
4085 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4086 - [`String` now implements `BorrowMut<str>`.][60404]
4087 - [`io::Cursor` now implements `Default`.][60234]
4088 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4089 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4090 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4091 environment has access to heap memory allocation.
4092 - [`String` now implements `From<&String>`.][59825]
4093 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4094 return a tuple of each argument when there is multiple arguments.
4095 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4100 - [`VecDeque::rotate_left`]
4101 - [`VecDeque::rotate_right`]
4102 - [`Iterator::copied`]
4104 - [`io::IoSliceMut`]
4105 - [`Read::read_vectored`]
4106 - [`Write::write_vectored`]
4107 - [`str::as_mut_ptr`]
4108 - [`mem::MaybeUninit`]
4109 - [`pointer::align_offset`]
4110 - [`future::Future`]
4112 - [`task::RawWaker`]
4113 - [`task::RawWakerVTable`]
4119 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4120 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4122 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4126 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4133 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4134 longer recommended, and will be deprecated in 1.39.0.
4136 [60318]: https://github.com/rust-lang/rust/pull/60318/
4137 [60364]: https://github.com/rust-lang/rust/pull/60364/
4138 [60370]: https://github.com/rust-lang/rust/pull/60370/
4139 [60404]: https://github.com/rust-lang/rust/pull/60404/
4140 [60234]: https://github.com/rust-lang/rust/pull/60234/
4141 [60244]: https://github.com/rust-lang/rust/pull/60244/
4142 [58623]: https://github.com/rust-lang/rust/pull/58623/
4143 [59648]: https://github.com/rust-lang/rust/pull/59648/
4144 [59675]: https://github.com/rust-lang/rust/pull/59675/
4145 [59825]: https://github.com/rust-lang/rust/pull/59825/
4146 [59826]: https://github.com/rust-lang/rust/pull/59826/
4147 [59445]: https://github.com/rust-lang/rust/pull/59445/
4148 [59114]: https://github.com/rust-lang/rust/pull/59114/
4149 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4150 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4151 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4152 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4153 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4154 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4155 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4156 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4157 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4158 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4159 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4160 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4161 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4162 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4163 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4164 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4165 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4166 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4167 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4168 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4171 Version 1.35.0 (2019-05-23)
4172 ==========================
4176 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4177 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4178 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4180 unsafe fn call_unsafe(func: unsafe fn()) {
4185 unsafe { call_unsafe(|| {}); }
4192 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4193 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4194 - [Added the `wasm32-unknown-wasi` target.][59464]
4199 - [`Thread` will now show its ID in `Debug` output.][59460]
4200 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4201 - [`alloc::System` now implements `Default`.][59451]
4202 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4204 - [`char::{ToLowercase, ToUppercase}` now
4205 implement `ExactSizeIterator`.][58778]
4206 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4207 - [Removed the `Read` trait bounds
4208 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4209 - [You can now call the `dbg!` macro without any parameters to print the file
4210 and line where it is called.][57847]
4211 - [In place ASCII case conversions are now up to 4× faster.][59283]
4212 e.g. `str::make_ascii_lowercase`
4213 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4220 - [`RefCell::replace_with`]
4221 - [`RefCell::map_split`]
4223 - [`Range::contains`]
4224 - [`RangeFrom::contains`]
4225 - [`RangeTo::contains`]
4226 - [`RangeInclusive::contains`]
4227 - [`RangeToInclusive::contains`]
4228 - [`Option::copied`]
4232 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4233 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4238 - [The Rust toolchain is now available natively for musl based distros.][58575]
4240 [59460]: https://github.com/rust-lang/rust/pull/59460/
4241 [59464]: https://github.com/rust-lang/rust/pull/59464/
4242 [59500]: https://github.com/rust-lang/rust/pull/59500/
4243 [59512]: https://github.com/rust-lang/rust/pull/59512/
4244 [59580]: https://github.com/rust-lang/rust/pull/59580/
4245 [59283]: https://github.com/rust-lang/rust/pull/59283/
4246 [59451]: https://github.com/rust-lang/rust/pull/59451/
4247 [59076]: https://github.com/rust-lang/rust/pull/59076/
4248 [58778]: https://github.com/rust-lang/rust/pull/58778/
4249 [58717]: https://github.com/rust-lang/rust/pull/58717/
4250 [58369]: https://github.com/rust-lang/rust/pull/58369/
4251 [58423]: https://github.com/rust-lang/rust/pull/58423/
4252 [58080]: https://github.com/rust-lang/rust/pull/58080/
4253 [57847]: https://github.com/rust-lang/rust/pull/57847/
4254 [58575]: https://github.com/rust-lang/rust/pull/58575
4255 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4256 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4257 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4258 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4259 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4260 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4261 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4262 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4263 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4264 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4265 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4266 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4268 Version 1.34.2 (2019-05-14)
4269 ===========================
4271 * [Destabilize the `Error::type_id` function due to a security
4272 vulnerability][60785] ([CVE-2019-12083])
4274 [60785]: https://github.com/rust-lang/rust/pull/60785
4275 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4277 Version 1.34.1 (2019-04-25)
4278 ===========================
4280 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4281 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4282 * [Fix Clippy panic when checking some macros][clippy/3805]
4284 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4285 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4286 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4288 Version 1.34.0 (2019-04-11)
4289 ==========================
4293 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4294 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4296 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4297 `#[attr{}]` procedural macros.][57367]
4298 - [You can now write `extern crate self as foo;`][57407] to import your
4299 crate's root into the extern prelude.
4304 - [You can now target `riscv64imac-unknown-none-elf` and
4305 `riscv64gc-unknown-none-elf`.][58406]
4306 - [You can now enable linker plugin LTO optimisations with
4307 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4308 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4310 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4315 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4316 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4317 the `Hash` trait to create an iterator.
4318 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4319 methods.][58421] Most notably you no longer require the `Ord` trait to create
4321 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4322 for all numeric types.][58044]
4323 - [Indexing a `str` is now generic over all types that
4324 implement `SliceIndex<str>`.][57604]
4325 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4326 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4327 produce a warning if their returning type is unused.
4328 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4329 `overflowing_pow` are now available for all numeric types.][57873] These are
4330 equivalent to methods such as `wrapping_add` for the `pow` operation.
4338 * [`Error::type_id`]
4339 * [`atomic::AtomicI16`]
4340 * [`atomic::AtomicI32`]
4341 * [`atomic::AtomicI64`]
4342 * [`atomic::AtomicI8`]
4343 * [`atomic::AtomicU16`]
4344 * [`atomic::AtomicU32`]
4345 * [`atomic::AtomicU64`]
4346 * [`atomic::AtomicU8`]
4347 * [`convert::Infallible`]
4348 * [`convert::TryFrom`]
4349 * [`convert::TryInto`]
4351 * [`iter::successors`]
4352 * [`num::NonZeroI128`]
4353 * [`num::NonZeroI16`]
4354 * [`num::NonZeroI32`]
4355 * [`num::NonZeroI64`]
4356 * [`num::NonZeroI8`]
4357 * [`num::NonZeroIsize`]
4358 * [`slice::sort_by_cached_key`]
4359 * [`str::escape_debug`]
4360 * [`str::escape_default`]
4361 * [`str::escape_unicode`]
4362 * [`str::split_ascii_whitespace`]
4365 * [`Instant::checked_add`]
4366 * [`Instant::checked_sub`]
4367 * [`SystemTime::checked_add`]
4368 * [`SystemTime::checked_sub`]
4372 - [You can now use alternative registries to crates.io.][cargo/6654]
4376 - [You can now use the `?` operator in your documentation tests without manually
4377 adding `fn main() -> Result<(), _> {}`.][56470]
4381 - [`Command::before_exec` is being replaced by the unsafe method
4382 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4383 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4384 can now use `const` functions in `static` variables.
4386 [58370]: https://github.com/rust-lang/rust/pull/58370/
4387 [58406]: https://github.com/rust-lang/rust/pull/58406/
4388 [58421]: https://github.com/rust-lang/rust/pull/58421/
4389 [58166]: https://github.com/rust-lang/rust/pull/58166/
4390 [58044]: https://github.com/rust-lang/rust/pull/58044/
4391 [58057]: https://github.com/rust-lang/rust/pull/58057/
4392 [58059]: https://github.com/rust-lang/rust/pull/58059/
4393 [57809]: https://github.com/rust-lang/rust/pull/57809/
4394 [57873]: https://github.com/rust-lang/rust/pull/57873/
4395 [57604]: https://github.com/rust-lang/rust/pull/57604/
4396 [57367]: https://github.com/rust-lang/rust/pull/57367/
4397 [57407]: https://github.com/rust-lang/rust/pull/57407/
4398 [57425]: https://github.com/rust-lang/rust/pull/57425/
4399 [57106]: https://github.com/rust-lang/rust/pull/57106/
4400 [56470]: https://github.com/rust-lang/rust/pull/56470/
4401 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4402 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4403 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4404 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4405 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4406 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4407 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4408 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4409 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4410 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4411 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4412 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4413 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4414 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4415 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4416 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4417 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4418 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4419 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4420 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4421 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4422 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4423 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4424 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4425 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4426 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4427 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4428 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4429 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4430 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4431 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4434 Version 1.33.0 (2019-02-28)
4435 ==========================
4439 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4440 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4441 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4442 E.g. You can have match statement on a `u8` that covers `0..=255` and
4443 you would no longer be required to have a `_ => unreachable!()` case.
4444 - [You can now have multiple patterns in `if let` and `while let`
4445 expressions.][57532] You can do this with the same syntax as a `match`
4455 let state = Creature::Crab("Ferris");
4457 if let Creature::Crab(name) | Creature::Person(name) = state {
4458 println!("This creature's name is: {}", name);
4462 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4463 this feature will by default produce a warning as this behaviour can be
4464 unintuitive. E.g. `if let _ = 5 {}`
4465 - [You can now use `let` bindings, assignments, expression statements,
4466 and irrefutable pattern destructuring in const functions.][57175]
4467 - [You can now call unsafe const functions.][57067] E.g.
4469 const unsafe fn foo() -> i32 { 5 }
4470 const fn bar() -> i32 {
4474 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4475 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4476 - [You can now specify a specific alignment with the `#[repr(packed)]`
4477 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4478 with an alignment of 2 bytes and a size of 6 bytes.
4479 - [You can now import an item from a module as an `_`.][56303] This allows you to
4480 import a trait's impls, and not have the name in the namespace. E.g.
4482 use std::io::Read as _;
4484 // Allowed as there is only one `Read` in the module.
4487 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4491 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4492 command line argument.][56351]
4493 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4494 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4495 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4496 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4497 information on Rust's platform support.
4498 - [Added support for the `thumbv7neon-linux-androideabi` and
4499 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4500 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4504 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4505 functions for all numeric types.][57566]
4506 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4507 are now `const` functions for all numeric types.][57105]
4508 - [The methods `is_positive` and `is_negative` are now `const` functions for
4509 all signed numeric types.][57105]
4510 - [The `get` method for all `NonZero` types is now `const`.][57167]
4511 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4512 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4513 numeric types.][57234]
4514 - [`Ipv4Addr::new` is now a `const` function][57234]
4518 - [`unix::FileExt::read_exact_at`]
4519 - [`unix::FileExt::write_all_at`]
4520 - [`Option::transpose`]
4521 - [`Result::transpose`]
4522 - [`convert::identity`]
4525 - [`marker::PhantomPinned`]
4526 - [`Vec::resize_with`]
4527 - [`VecDeque::resize_with`]
4528 - [`Duration::as_millis`]
4529 - [`Duration::as_micros`]
4530 - [`Duration::as_nanos`]
4535 - [You can now publish crates that require a feature flag to compile with
4536 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4537 - [Cargo should now rebuild a crate if a file was modified during the initial
4542 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4543 are now deprecated in the standard library, and their usage will now produce a warning.
4544 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4546 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4548 - [Libtest no longer creates a new thread for each test when
4549 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4551 [56243]: https://github.com/rust-lang/rust/pull/56243
4552 [56303]: https://github.com/rust-lang/rust/pull/56303/
4553 [56351]: https://github.com/rust-lang/rust/pull/56351/
4554 [56362]: https://github.com/rust-lang/rust/pull/56362
4555 [56642]: https://github.com/rust-lang/rust/pull/56642/
4556 [56769]: https://github.com/rust-lang/rust/pull/56769/
4557 [56805]: https://github.com/rust-lang/rust/pull/56805
4558 [56947]: https://github.com/rust-lang/rust/pull/56947/
4559 [57049]: https://github.com/rust-lang/rust/pull/57049/
4560 [57067]: https://github.com/rust-lang/rust/pull/57067/
4561 [57105]: https://github.com/rust-lang/rust/pull/57105
4562 [57130]: https://github.com/rust-lang/rust/pull/57130/
4563 [57167]: https://github.com/rust-lang/rust/pull/57167/
4564 [57175]: https://github.com/rust-lang/rust/pull/57175/
4565 [57234]: https://github.com/rust-lang/rust/pull/57234/
4566 [57332]: https://github.com/rust-lang/rust/pull/57332/
4567 [57465]: https://github.com/rust-lang/rust/pull/57465/
4568 [57532]: https://github.com/rust-lang/rust/pull/57532/
4569 [57535]: https://github.com/rust-lang/rust/pull/57535/
4570 [57566]: https://github.com/rust-lang/rust/pull/57566/
4571 [57615]: https://github.com/rust-lang/rust/pull/57615/
4572 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4573 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4574 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4575 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4576 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4577 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4578 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4579 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4580 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4581 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4582 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4583 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4584 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4585 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4586 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4587 [platform-support]: https://forge.rust-lang.org/platform-support.html
4589 Version 1.32.0 (2019-01-17)
4590 ==========================
4595 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4596 operator allows you to specify zero or one repetitions similar to the `*` and
4598 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4599 now always resolve to the item (`enum`, `struct`, etc.) available in the
4600 module if present, before resolving to a external crate or an item the prelude.][56759]
4603 enum Color { Red, Green, Blue }
4609 - [You can now match against `PhantomData<T>` types.][55837]
4610 - [You can now match against literals in macros with the `literal`
4611 specifier.][56072] This will match against a literal of any type.
4612 E.g. `1`, `'A'`, `"Hello World"`
4613 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4615 struct Point(i32, i32);
4618 pub fn new(x: i32, y: i32) -> Self {
4622 pub fn is_origin(&self) -> bool {
4630 - [Self can also now be used in type definitions.][56366] E.g.
4634 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4637 Cons(T, Box<Self>) // likewise here
4640 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4641 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4645 - [The default allocator has changed from jemalloc to the default allocator on
4646 your system.][55238] The compiler itself on Linux & macOS will still use
4647 jemalloc, but programs compiled with it will use the system allocator.
4648 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4652 - [`PathBuf` now implements `FromStr`.][55148]
4653 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4654 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4655 easily debug expressions in your rust program. E.g.
4658 let b = dbg!(a * 2) + 1;
4659 // ^-- prints: [src/main.rs:4] a * 2 = 4
4663 The following APIs are now `const` functions and can be used in a
4667 - [`UnsafeCell::get`]
4668 - [`char::is_ascii`]
4670 - [`ManuallyDrop::new`]
4671 - [`ManuallyDrop::into_inner`]
4672 - [`RangeInclusive::start`]
4673 - [`RangeInclusive::end`]
4674 - [`NonNull::as_ptr`]
4677 - [`Duration::as_secs`]
4678 - [`Duration::subsec_millis`]
4679 - [`Duration::subsec_micros`]
4680 - [`Duration::subsec_nanos`]
4682 - [`Ipv4Addr::is_unspecified`]
4684 - [`Ipv6Addr::octets`]
4688 - [`i8::to_be_bytes`]
4689 - [`i8::to_le_bytes`]
4690 - [`i8::to_ne_bytes`]
4691 - [`i8::from_be_bytes`]
4692 - [`i8::from_le_bytes`]
4693 - [`i8::from_ne_bytes`]
4694 - [`i16::to_be_bytes`]
4695 - [`i16::to_le_bytes`]
4696 - [`i16::to_ne_bytes`]
4697 - [`i16::from_be_bytes`]
4698 - [`i16::from_le_bytes`]
4699 - [`i16::from_ne_bytes`]
4700 - [`i32::to_be_bytes`]
4701 - [`i32::to_le_bytes`]
4702 - [`i32::to_ne_bytes`]
4703 - [`i32::from_be_bytes`]
4704 - [`i32::from_le_bytes`]
4705 - [`i32::from_ne_bytes`]
4706 - [`i64::to_be_bytes`]
4707 - [`i64::to_le_bytes`]
4708 - [`i64::to_ne_bytes`]
4709 - [`i64::from_be_bytes`]
4710 - [`i64::from_le_bytes`]
4711 - [`i64::from_ne_bytes`]
4712 - [`i128::to_be_bytes`]
4713 - [`i128::to_le_bytes`]
4714 - [`i128::to_ne_bytes`]
4715 - [`i128::from_be_bytes`]
4716 - [`i128::from_le_bytes`]
4717 - [`i128::from_ne_bytes`]
4718 - [`isize::to_be_bytes`]
4719 - [`isize::to_le_bytes`]
4720 - [`isize::to_ne_bytes`]
4721 - [`isize::from_be_bytes`]
4722 - [`isize::from_le_bytes`]
4723 - [`isize::from_ne_bytes`]
4724 - [`u8::to_be_bytes`]
4725 - [`u8::to_le_bytes`]
4726 - [`u8::to_ne_bytes`]
4727 - [`u8::from_be_bytes`]
4728 - [`u8::from_le_bytes`]
4729 - [`u8::from_ne_bytes`]
4730 - [`u16::to_be_bytes`]
4731 - [`u16::to_le_bytes`]
4732 - [`u16::to_ne_bytes`]
4733 - [`u16::from_be_bytes`]
4734 - [`u16::from_le_bytes`]
4735 - [`u16::from_ne_bytes`]
4736 - [`u32::to_be_bytes`]
4737 - [`u32::to_le_bytes`]
4738 - [`u32::to_ne_bytes`]
4739 - [`u32::from_be_bytes`]
4740 - [`u32::from_le_bytes`]
4741 - [`u32::from_ne_bytes`]
4742 - [`u64::to_be_bytes`]
4743 - [`u64::to_le_bytes`]
4744 - [`u64::to_ne_bytes`]
4745 - [`u64::from_be_bytes`]
4746 - [`u64::from_le_bytes`]
4747 - [`u64::from_ne_bytes`]
4748 - [`u128::to_be_bytes`]
4749 - [`u128::to_le_bytes`]
4750 - [`u128::to_ne_bytes`]
4751 - [`u128::from_be_bytes`]
4752 - [`u128::from_le_bytes`]
4753 - [`u128::from_ne_bytes`]
4754 - [`usize::to_be_bytes`]
4755 - [`usize::to_le_bytes`]
4756 - [`usize::to_ne_bytes`]
4757 - [`usize::from_be_bytes`]
4758 - [`usize::from_le_bytes`]
4759 - [`usize::from_ne_bytes`]
4763 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4764 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4768 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4772 - [The argument types for AVX's
4773 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4774 been changed from `*const` to `*mut` as the previous implementation
4778 [55148]: https://github.com/rust-lang/rust/pull/55148/
4779 [55238]: https://github.com/rust-lang/rust/pull/55238/
4780 [55280]: https://github.com/rust-lang/rust/pull/55280/
4781 [55610]: https://github.com/rust-lang/rust/pull/55610/
4782 [55663]: https://github.com/rust-lang/rust/pull/55663/
4783 [55702]: https://github.com/rust-lang/rust/pull/55702/
4784 [55837]: https://github.com/rust-lang/rust/pull/55837/
4785 [55843]: https://github.com/rust-lang/rust/pull/55843/
4786 [56072]: https://github.com/rust-lang/rust/pull/56072/
4787 [56245]: https://github.com/rust-lang/rust/pull/56245/
4788 [56365]: https://github.com/rust-lang/rust/pull/56365/
4789 [56366]: https://github.com/rust-lang/rust/pull/56366/
4790 [56395]: https://github.com/rust-lang/rust/pull/56395/
4791 [56759]: https://github.com/rust-lang/rust/pull/56759/
4792 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4793 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4794 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4795 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4796 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4797 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4798 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4799 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4800 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4801 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4802 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4803 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4804 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4805 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4806 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4807 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4808 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4809 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4810 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4811 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4812 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4813 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4814 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4815 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4816 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4817 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4818 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4819 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4820 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4821 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4822 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4823 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4824 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4825 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4826 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4827 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4828 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4829 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4830 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4831 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4832 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4833 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4834 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4835 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4836 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4837 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4838 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4839 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4840 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4841 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4842 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4843 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4844 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4845 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4846 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4847 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4848 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4849 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4850 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4851 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4852 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4853 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4854 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4855 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4856 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4857 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4858 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4859 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4860 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4861 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4862 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4863 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4864 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4865 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4866 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4867 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4868 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4869 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4870 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4871 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4872 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4873 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4874 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4875 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4876 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4877 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4878 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4879 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4880 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4881 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4882 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4883 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4884 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4887 Version 1.31.1 (2018-12-20)
4888 ===========================
4890 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4891 - [Fix broken go-to-definition in RLS][rls/1171]
4892 - [Fix infinite loop on hover in RLS][rls/1170]
4894 [56562]: https://github.com/rust-lang/rust/pull/56562
4895 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4896 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4898 Version 1.31.0 (2018-12-06)
4899 ==========================
4903 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4904 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4905 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4906 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4908 - [You can now define and use `const` functions.][54835] These are currently
4909 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4910 [language reference][const-reference] for what exactly is available.
4911 - [You can now use tool lints, which allow you to scope lints from external
4912 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4913 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4914 a crate, not just in exported functions.][54451]
4915 - [You can now use parentheses in pattern matches.][54497]
4919 - [Updated musl to 1.1.20][54430]
4923 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4924 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4925 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4926 into `Option<&mut T>` using the `From` trait.][53218]
4927 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4932 - [`slice::align_to`]
4933 - [`slice::align_to_mut`]
4934 - [`slice::chunks_exact`]
4935 - [`slice::chunks_exact_mut`]
4936 - [`slice::rchunks`]
4937 - [`slice::rchunks_mut`]
4938 - [`slice::rchunks_exact`]
4939 - [`slice::rchunks_exact_mut`]
4940 - [`Option::replace`]
4944 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4945 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4946 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4948 [52813]: https://github.com/rust-lang/rust/pull/52813/
4949 [53218]: https://github.com/rust-lang/rust/pull/53218/
4950 [54057]: https://github.com/rust-lang/rust/pull/54057/
4951 [54240]: https://github.com/rust-lang/rust/pull/54240/
4952 [54430]: https://github.com/rust-lang/rust/pull/54430/
4953 [54451]: https://github.com/rust-lang/rust/pull/54451/
4954 [54497]: https://github.com/rust-lang/rust/pull/54497/
4955 [54778]: https://github.com/rust-lang/rust/pull/54778/
4956 [54835]: https://github.com/rust-lang/rust/pull/54835/
4957 [54870]: https://github.com/rust-lang/rust/pull/54870/
4958 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4959 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4960 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4961 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4962 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4963 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4964 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4965 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4966 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4967 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4968 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4969 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4970 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4971 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4973 Version 1.30.1 (2018-11-08)
4974 ===========================
4976 - [Fixed overflow ICE in rustdoc][54199]
4977 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4979 [54199]: https://github.com/rust-lang/rust/pull/54199
4980 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4982 Version 1.30.0 (2018-10-25)
4983 ==========================
4987 - [Procedural macros are now available.][52081] These kinds of macros allow for
4988 more powerful code generation. There is a [new chapter available][proc-macros]
4989 in the Rust Programming Language book that goes further in depth.
4990 - [You can now use keywords as identifiers using the raw identifiers
4991 syntax (`r#`),][53236] e.g. `let r#for = true;`
4992 - [Using anonymous parameters in traits is now deprecated with a warning and
4993 will be a hard error in the 2018 edition.][53272]
4994 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4995 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4996 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4997 Previously, using a external crate in a module without a use statement
4998 required `let json = ::serde_json::from_str(foo);` but can now be written
4999 as `let json = serde_json::from_str(foo);`.
5000 - [You can now apply the `#[used]` attribute to static items to prevent the
5001 compiler from optimising them away, even if they appear to be unused,][51363]
5002 e.g. `#[used] static FOO: u32 = 1;`
5003 - [You can now import and reexport macros from other crates with the `use`
5004 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5005 the root module of the crate. If your macro relies on calling other local
5006 macros, it is recommended to export with the
5007 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5009 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5010 using the `vis` specifier.][53370]
5011 - [Non-macro attributes now allow all forms of literals, not just
5012 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5013 write `#[attr(true)]`.
5014 - [You can now specify a function to handle a panic in the Rust runtime with the
5015 `#[panic_handler]` attribute.][51366]
5019 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5020 - [Added the `aarch64-unknown-netbsd` target][53165]
5021 - [Upgraded to LLVM 8.][53611]
5025 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5029 - [`Ipv4Addr::BROADCAST`]
5030 - [`Ipv4Addr::LOCALHOST`]
5031 - [`Ipv4Addr::UNSPECIFIED`]
5032 - [`Ipv6Addr::LOCALHOST`]
5033 - [`Ipv6Addr::UNSPECIFIED`]
5034 - [`Iterator::find_map`]
5036 The following methods are replacement methods for `trim_left`, `trim_right`,
5037 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5039 - [`str::trim_end_matches`]
5041 - [`str::trim_start_matches`]
5042 - [`str::trim_start`]
5046 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5047 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5048 equivalent to calling `rustdoc --error-format=json`.
5049 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5053 - [`rustdoc` allows you to specify what edition to treat your code as with the
5054 `--edition` option.][54057]
5055 - [`rustdoc` now has the `--color` (specify whether to output color) and
5056 `--error-format` (specify error format, e.g. `json`) options.][53003]
5057 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5058 debug symbols.][53774]
5059 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5060 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5062 [50911]: https://github.com/rust-lang/rust/pull/50911/
5063 [51363]: https://github.com/rust-lang/rust/pull/51363/
5064 [51366]: https://github.com/rust-lang/rust/pull/51366/
5065 [52081]: https://github.com/rust-lang/rust/pull/52081/
5066 [53003]: https://github.com/rust-lang/rust/pull/53003/
5067 [53033]: https://github.com/rust-lang/rust/pull/53033/
5068 [53044]: https://github.com/rust-lang/rust/pull/53044/
5069 [53165]: https://github.com/rust-lang/rust/pull/53165/
5070 [53611]: https://github.com/rust-lang/rust/pull/53611/
5071 [53236]: https://github.com/rust-lang/rust/pull/53236/
5072 [53272]: https://github.com/rust-lang/rust/pull/53272/
5073 [53370]: https://github.com/rust-lang/rust/pull/53370/
5074 [53459]: https://github.com/rust-lang/rust/pull/53459/
5075 [53774]: https://github.com/rust-lang/rust/pull/53774/
5076 [53822]: https://github.com/rust-lang/rust/pull/53822/
5077 [54057]: https://github.com/rust-lang/rust/pull/54057/
5078 [54404]: https://github.com/rust-lang/rust/pull/54404/
5079 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5080 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5081 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5082 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5084 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5085 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5086 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5087 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5088 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5089 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5090 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5091 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5092 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5093 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5096 Version 1.29.2 (2018-10-11)
5097 ===========================
5099 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5100 - The `rls-preview` component on the windows-gnu targets has been restored.
5102 [54639]: https://github.com/rust-lang/rust/pull/54639
5105 Version 1.29.1 (2018-09-25)
5106 ===========================
5111 - The standard library's `str::repeat` function contained an out of bounds write
5112 caused by an integer overflow. This has been fixed by deterministically
5113 panicking when an overflow happens.
5115 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5119 Version 1.29.0 (2018-09-13)
5120 ==========================
5124 - [Bumped minimum LLVM version to 5.0.][51899]
5125 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5126 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5127 - [Upgraded to LLVM 7.][51966]
5131 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5132 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5133 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5134 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5136 - [`Cell<T>` now allows `T` to be unsized.][50494]
5137 - [`SocketAddr` is now stable on Redox.][52656]
5142 - [`Iterator::flatten`]
5147 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5148 `--locked` to disable this behavior.
5149 - [`cargo-install` will now allow you to cross compile an install
5150 using `--target`.][cargo/5614]
5151 - [Added the `cargo-fix` subcommand to automatically move project code from
5152 2015 edition to 2018.][cargo/5723]
5153 - [`cargo doc` can now optionally document private types using the
5154 `--document-private-items` flag.][cargo/5543]
5158 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5159 the specified level to that level.][52354] For example `--cap-lints warn`
5160 will demote `deny` and `forbid` lints to `warn`.
5161 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5162 fails and `101` if there is a panic.][52197]
5163 - [A preview of clippy has been made available through rustup.][51122]
5164 You can install the preview with `rustup component add clippy-preview`.
5168 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5169 Use `str::get_unchecked(begin..end)` instead.
5170 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5171 Consider using the `home_dir` function from
5172 https://crates.io/crates/dirs instead.
5173 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5174 - [`cfg` attributes and `--cfg` command line flags are now more
5175 strictly validated.][53893]
5177 [53893]: https://github.com/rust-lang/rust/pull/53893/
5178 [52861]: https://github.com/rust-lang/rust/pull/52861/
5179 [51966]: https://github.com/rust-lang/rust/pull/51966/
5180 [52656]: https://github.com/rust-lang/rust/pull/52656/
5181 [52239]: https://github.com/rust-lang/rust/pull/52239/
5182 [52330]: https://github.com/rust-lang/rust/pull/52330/
5183 [52354]: https://github.com/rust-lang/rust/pull/52354/
5184 [52402]: https://github.com/rust-lang/rust/pull/52402/
5185 [52197]: https://github.com/rust-lang/rust/pull/52197/
5186 [51807]: https://github.com/rust-lang/rust/pull/51807/
5187 [51899]: https://github.com/rust-lang/rust/pull/51899/
5188 [51912]: https://github.com/rust-lang/rust/pull/51912/
5189 [51619]: https://github.com/rust-lang/rust/pull/51619/
5190 [51656]: https://github.com/rust-lang/rust/pull/51656/
5191 [51178]: https://github.com/rust-lang/rust/pull/51178/
5192 [51122]: https://github.com/rust-lang/rust/pull/51122
5193 [50494]: https://github.com/rust-lang/rust/pull/50494/
5194 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5195 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5196 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5197 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5198 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5199 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5200 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5203 Version 1.28.0 (2018-08-02)
5204 ===========================
5208 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5209 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5210 the inner type across Foreign Function Interface (FFI) boundaries.
5211 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5212 and can now be used as identifiers.][51196]
5213 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5214 stable.][51241] This will allow users to specify a global allocator for
5216 - [Unit test functions marked with the `#[test]` attribute can now return
5217 `Result<(), E: Debug>` in addition to `()`.][51298]
5218 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5219 allows macros to easily target lifetimes.
5223 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5224 prioritise making smaller binary sizes. `z` is the same as `s` with the
5225 exception that it does not vectorise loops, which typically results in an even
5227 - [The short error format is now stable.][49546] Specified with
5228 `--error-format=short` this option will provide a more compressed output of
5229 rust error messages.
5230 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5231 - [Reduced the number of allocations in the macro parser.][50855] This can
5232 improve compile times of macro heavy crates on average by 5%.
5236 - [Implemented `Default` for `&mut str`.][51306]
5237 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5238 - [Implemented `Extend` for `()`.][50234]
5239 - [The `Debug` implementation of `time::Duration` should now be more easily
5240 human readable.][50364] Previously a `Duration` of one second would printed as
5241 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5242 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5243 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5244 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5245 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5246 for `PathBuf`.][50170]
5247 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5248 and `Wrapping<i128>`.][50465]
5249 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5250 possible.][51050] This can provide up to a 40% speed increase.
5251 - [Improved error messages when using `format!`.][50610]
5255 - [`Iterator::step_by`]
5256 - [`Path::ancestors`]
5257 - [`SystemTime::UNIX_EPOCH`]
5258 - [`alloc::GlobalAlloc`]
5260 - [`alloc::LayoutErr`]
5263 - [`alloc::alloc_zeroed`]
5264 - [`alloc::dealloc`]
5265 - [`alloc::realloc`]
5266 - [`alloc::handle_alloc_error`]
5267 - [`btree_map::Entry::or_default`]
5268 - [`fmt::Alignment`]
5269 - [`hash_map::Entry::or_default`]
5270 - [`iter::repeat_with`]
5271 - [`num::NonZeroUsize`]
5272 - [`num::NonZeroU128`]
5273 - [`num::NonZeroU16`]
5274 - [`num::NonZeroU32`]
5275 - [`num::NonZeroU64`]
5276 - [`num::NonZeroU8`]
5277 - [`ops::RangeBounds`]
5278 - [`slice::SliceIndex`]
5279 - [`slice::from_mut`]
5280 - [`slice::from_ref`]
5281 - [`{Any + Send + Sync}::downcast_mut`]
5282 - [`{Any + Send + Sync}::downcast_ref`]
5283 - [`{Any + Send + Sync}::is`]
5287 - [Cargo will now no longer allow you to publish crates with build scripts that
5288 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5289 considered to be immutable.
5293 - [The `suggestion_applicability` field in `rustc`'s json output is now
5294 stable.][50486] This will allow dev tools to check whether a code suggestion
5295 would apply to them.
5299 - [Rust will consider trait objects with duplicated constraints to be the same
5300 type as without the duplicated constraint.][51276] For example the below code will
5301 now fail to compile.
5306 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5309 impl Trait + Send + Send {
5310 fn test(&self) { println!("two"); }
5314 [49546]: https://github.com/rust-lang/rust/pull/49546/
5315 [50143]: https://github.com/rust-lang/rust/pull/50143/
5316 [50170]: https://github.com/rust-lang/rust/pull/50170/
5317 [50234]: https://github.com/rust-lang/rust/pull/50234/
5318 [50265]: https://github.com/rust-lang/rust/pull/50265/
5319 [50364]: https://github.com/rust-lang/rust/pull/50364/
5320 [50385]: https://github.com/rust-lang/rust/pull/50385/
5321 [50465]: https://github.com/rust-lang/rust/pull/50465/
5322 [50486]: https://github.com/rust-lang/rust/pull/50486/
5323 [50554]: https://github.com/rust-lang/rust/pull/50554/
5324 [50610]: https://github.com/rust-lang/rust/pull/50610/
5325 [50855]: https://github.com/rust-lang/rust/pull/50855/
5326 [51050]: https://github.com/rust-lang/rust/pull/51050/
5327 [51196]: https://github.com/rust-lang/rust/pull/51196/
5328 [51241]: https://github.com/rust-lang/rust/pull/51241/
5329 [51276]: https://github.com/rust-lang/rust/pull/51276/
5330 [51298]: https://github.com/rust-lang/rust/pull/51298/
5331 [51306]: https://github.com/rust-lang/rust/pull/51306/
5332 [51562]: https://github.com/rust-lang/rust/pull/51562/
5333 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5334 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5335 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5336 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5337 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5338 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5339 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5340 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5341 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5342 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5343 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5344 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5345 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5346 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5347 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5348 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5349 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5350 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5351 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5352 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5353 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5354 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5355 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5356 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5357 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5358 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5359 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5360 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5361 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5362 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5364 Version 1.27.2 (2018-07-20)
5365 ===========================
5370 - The borrow checker was fixed to avoid potential unsoundness when using
5371 match ergonomics: [#52213][52213].
5373 [52213]: https://github.com/rust-lang/rust/issues/52213
5375 Version 1.27.1 (2018-07-10)
5376 ===========================
5381 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5382 when running, which enabled executing code as some other user on a
5383 given machine. This release fixes that vulnerability; you can read
5384 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5386 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5391 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5392 match ergonomics: [#51415][51415], [#49534][49534].
5394 [51415]: https://github.com/rust-lang/rust/issues/51415
5395 [49534]: https://github.com/rust-lang/rust/issues/49534
5396 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5397 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5399 Version 1.27.0 (2018-06-21)
5400 ==========================
5404 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5405 be used as an identifier.
5406 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5407 bare `Trait` syntax, and should make it clearer when being used in tandem with
5408 `impl Trait` because it is equivalent to the following syntax:
5409 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5410 `Box<Trait> == Box<dyn Trait>`.
5411 - [Attributes on generic parameters such as types and lifetimes are
5412 now stable.][48851] e.g.
5413 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5414 - [The `#[must_use]` attribute can now also be used on functions as well as
5415 types.][48925] It provides a lint that by default warns users when the
5416 value returned by a function has not been used.
5420 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5424 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5425 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5426 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5427 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5428 the `cfg` attribute.
5429 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5430 std are now available in core.][49896]
5431 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5433 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5434 that the operation isn't done in place.
5435 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5436 the `#[must_use]` attribute][49533] to warn about unused potentially
5437 expensive allocations.
5441 - [`DoubleEndedIterator::rfind`]
5442 - [`DoubleEndedIterator::rfold`]
5443 - [`DoubleEndedIterator::try_rfold`]
5444 - [`Duration::from_micros`]
5445 - [`Duration::from_nanos`]
5446 - [`Duration::subsec_micros`]
5447 - [`Duration::subsec_millis`]
5448 - [`HashMap::remove_entry`]
5449 - [`Iterator::try_fold`]
5450 - [`Iterator::try_for_each`]
5452 - [`Option::filter`]
5453 - [`String::replace_range`]
5454 - [`Take::set_limit`]
5455 - [`hint::unreachable_unchecked`]
5456 - [`os::unix::process::parent_id`]
5457 - [`ptr::swap_nonoverlapping`]
5458 - [`slice::rsplit_mut`]
5460 - [`slice::swap_with_slice`]
5464 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5465 `readme`, and `repository` fields.][cargo/5386]
5466 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5467 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5468 a different directory than `target` for placing compilation artifacts.
5469 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5470 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5471 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5472 where cargo would infer a binary, Cargo will produce a warning. You can
5473 disable this feature ahead of time by setting any of the following to false:
5474 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5475 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5476 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5480 - [Added “The Rustc book” into the official documentation.][49707]
5481 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5482 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5486 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5487 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5488 compile, `"".is_empty()` will still compile.
5489 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5490 will only print the inner type.][48553] E.g.
5491 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5492 not `AtomicBool(true)`.
5493 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5494 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5495 alignment should cover all use cases.
5496 - The `.description()` method on the `std::error::Error` trait
5497 [has been soft-deprecated][50163]. It is no longer required to implement it.
5499 [48553]: https://github.com/rust-lang/rust/pull/48553/
5500 [48851]: https://github.com/rust-lang/rust/pull/48851/
5501 [48925]: https://github.com/rust-lang/rust/pull/48925/
5502 [49533]: https://github.com/rust-lang/rust/pull/49533/
5503 [49623]: https://github.com/rust-lang/rust/pull/49623/
5504 [49630]: https://github.com/rust-lang/rust/pull/49630/
5505 [49664]: https://github.com/rust-lang/rust/pull/49664/
5506 [49699]: https://github.com/rust-lang/rust/pull/49699/
5507 [49707]: https://github.com/rust-lang/rust/pull/49707/
5508 [49896]: https://github.com/rust-lang/rust/pull/49896/
5509 [49968]: https://github.com/rust-lang/rust/pull/49968/
5510 [50163]: https://github.com/rust-lang/rust/pull/50163
5511 [50177]: https://github.com/rust-lang/rust/pull/50177/
5512 [50378]: https://github.com/rust-lang/rust/pull/50378/
5513 [50423]: https://github.com/rust-lang/rust/pull/50423/
5514 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5515 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5516 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5517 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5518 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5519 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5520 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5521 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5522 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5523 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5524 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5525 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5526 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5527 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5528 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5529 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5530 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5531 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5532 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5533 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5534 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5535 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5536 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5537 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5538 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5539 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5540 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5541 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5542 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5545 Version 1.26.2 (2018-06-05)
5546 ==========================
5551 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5553 [51117]: https://github.com/rust-lang/rust/issues/51117
5556 Version 1.26.1 (2018-05-29)
5557 ==========================
5562 - [RLS now works on Windows.][50646]
5563 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5569 - [`fn main() -> impl Trait` no longer works for non-Termination
5571 This reverts an accidental stabilization.
5572 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5573 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5575 [50646]: https://github.com/rust-lang/rust/issues/50646
5576 [50656]: https://github.com/rust-lang/rust/pull/50656
5577 [50812]: https://github.com/rust-lang/rust/pull/50812
5578 [50950]: https://github.com/rust-lang/rust/issues/50950
5579 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5581 Version 1.26.0 (2018-05-10)
5582 ==========================
5586 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5587 implement either or both traits.][49299]
5588 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5589 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5590 lifetime can be elided.][49458]
5591 - [`impl Trait` is now stable allowing you to have abstract types in returns
5592 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5593 `fn open(path: impl AsRef<Path>)`.
5594 - [Pattern matching will now automatically apply dereferences.][49394]
5595 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5596 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5597 - [A lot of operations are now available in a const context.][46882] E.g. You
5598 can now index into constant arrays, reference and dereference into constants,
5599 and use tuple struct constructors.
5600 - [Fixed entry slice patterns are now stable.][48516] E.g.
5602 let points = [1, 2, 3, 4];
5604 [1, 2, 3, 4] => println!("All points were sequential."),
5605 _ => println!("Not all points were sequential."),
5612 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5613 - [Fixed exponential projection complexity on nested types.][48296]
5614 This can provide up to a ~12% reduction in compile times for certain crates.
5615 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5616 to remap path prefixes outputted by the compiler.
5617 - [Added `powerpc-unknown-netbsd` target.][48281]
5621 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5622 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5623 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5624 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5625 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5626 - [`ascii::escape_default` is now available in libcore.][48735]
5627 - [Trailing commas are now supported in std and core macros.][48056]
5628 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5629 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5634 - [`*const T::copy_to_nonoverlapping`]
5635 - [`*const T::copy_to`]
5636 - [`*const T::read_unaligned`]
5637 - [`*const T::read_volatile`]
5638 - [`*const T::read`]
5640 - [`*const T::wrapping_add`]
5641 - [`*const T::wrapping_sub`]
5643 - [`*mut T::copy_to_nonoverlapping`]
5644 - [`*mut T::copy_to`]
5645 - [`*mut T::read_unaligned`]
5646 - [`*mut T::read_volatile`]
5648 - [`*mut T::replace`]
5651 - [`*mut T::wrapping_add`]
5652 - [`*mut T::wrapping_sub`]
5653 - [`*mut T::write_bytes`]
5654 - [`*mut T::write_unaligned`]
5655 - [`*mut T::write_volatile`]
5658 - [`FromUtf8Error::as_bytes`]
5659 - [`LocalKey::try_with`]
5660 - [`Option::cloned`]
5661 - [`btree_map::Entry::and_modify`]
5662 - [`fs::read_to_string`]
5665 - [`hash_map::Entry::and_modify`]
5666 - [`iter::FusedIterator`]
5667 - [`ops::RangeInclusive`]
5668 - [`ops::RangeToInclusive`]
5670 - [`slice::rotate_left`]
5671 - [`slice::rotate_right`]
5672 - [`String::retain`]
5677 - [Cargo will now output path to custom commands when `-v` is
5678 passed with `--list`][cargo/5041]
5679 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5683 - [The second edition of "The Rust Programming Language" book is now recommended
5684 over the first.][48404]
5689 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5690 syntax is now invalid.
5692 use std::ops::Fn as dyn;
5693 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5695 - [The result of dereferences are no longer promoted to `'static`.][47408]
5699 const PAIR: &(i32, i32) = &(0, 1);
5700 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5703 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5704 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5706 - [Removed hoedown from rustdoc.][48274]
5707 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5709 [46882]: https://github.com/rust-lang/rust/pull/46882
5710 [47379]: https://github.com/rust-lang/rust/pull/47379
5711 [47408]: https://github.com/rust-lang/rust/pull/47408
5712 [47813]: https://github.com/rust-lang/rust/pull/47813
5713 [48056]: https://github.com/rust-lang/rust/pull/48056
5714 [48125]: https://github.com/rust-lang/rust/pull/48125
5715 [48235]: https://github.com/rust-lang/rust/pull/48235
5716 [48274]: https://github.com/rust-lang/rust/pull/48274
5717 [48281]: https://github.com/rust-lang/rust/pull/48281
5718 [48296]: https://github.com/rust-lang/rust/pull/48296
5719 [48326]: https://github.com/rust-lang/rust/pull/48326
5720 [48359]: https://github.com/rust-lang/rust/pull/48359
5721 [48404]: https://github.com/rust-lang/rust/pull/48404
5722 [48481]: https://github.com/rust-lang/rust/pull/48481
5723 [48516]: https://github.com/rust-lang/rust/pull/48516
5724 [48628]: https://github.com/rust-lang/rust/pull/48628
5725 [48629]: https://github.com/rust-lang/rust/pull/48629
5726 [48657]: https://github.com/rust-lang/rust/pull/48657
5727 [48735]: https://github.com/rust-lang/rust/pull/48735
5728 [48978]: https://github.com/rust-lang/rust/pull/48978
5729 [49101]: https://github.com/rust-lang/rust/pull/49101
5730 [49109]: https://github.com/rust-lang/rust/pull/49109
5731 [49162]: https://github.com/rust-lang/rust/pull/49162
5732 [49255]: https://github.com/rust-lang/rust/pull/49255
5733 [49299]: https://github.com/rust-lang/rust/pull/49299
5734 [49305]: https://github.com/rust-lang/rust/pull/49305
5735 [49394]: https://github.com/rust-lang/rust/pull/49394
5736 [49458]: https://github.com/rust-lang/rust/pull/49458
5737 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5738 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5739 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5740 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5741 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5742 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5743 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5744 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5745 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5746 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5747 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5748 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5749 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5750 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5751 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5752 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5753 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5754 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5755 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5756 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5757 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5758 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5759 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5760 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5761 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5762 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5763 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5764 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5765 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5766 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5767 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5768 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5769 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5770 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5771 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5772 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5773 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5774 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5775 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5776 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5777 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5778 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5781 Version 1.25.0 (2018-03-29)
5782 ==========================
5786 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5787 - [You can now use nested groups of imports.][47948]
5788 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5789 - [You can now have `|` at the start of a match arm.][47947] e.g.
5791 enum Foo { A, B, C }
5797 | Foo::B => println!("AB"),
5798 | Foo::C => println!("C"),
5805 - [Upgraded to LLVM 6.][47828]
5806 - [Added `-C lto=val` option.][47521]
5807 - [Added `i586-unknown-linux-musl` target][47282]
5811 - [Impl Send for `process::Command` on Unix.][47760]
5812 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5813 - [`UnsafeCell::into_inner` is now safe.][47204]
5814 - [Implement libstd for CloudABI.][47268]
5815 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5816 - [Implement `AsRef<Path>` for Component][46985]
5817 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5818 - [Moved `Duration` to libcore.][46666]
5822 - [`Location::column`]
5825 The following functions can now be used in a constant expression.
5826 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5827 - [`Duration::new`][47300]
5828 - [`Duration::from_secs`][47300]
5829 - [`Duration::from_millis`][47300]
5833 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5834 - [`cargo new` now defaults to creating a binary crate, instead of a
5835 library crate.][cargo/5029]
5839 - [Rust by example is now shipped with new releases][46196]
5843 - [Deprecated `net::lookup_host`.][47510]
5844 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5845 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5846 around indexing operations (see [#47349][47349]). This has been fixed (which also
5847 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5848 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5850 [33903]: https://github.com/rust-lang/rust/pull/33903
5851 [47947]: https://github.com/rust-lang/rust/pull/47947
5852 [47948]: https://github.com/rust-lang/rust/pull/47948
5853 [47760]: https://github.com/rust-lang/rust/pull/47760
5854 [47790]: https://github.com/rust-lang/rust/pull/47790
5855 [47828]: https://github.com/rust-lang/rust/pull/47828
5856 [47398]: https://github.com/rust-lang/rust/pull/47398
5857 [47510]: https://github.com/rust-lang/rust/pull/47510
5858 [47521]: https://github.com/rust-lang/rust/pull/47521
5859 [47204]: https://github.com/rust-lang/rust/pull/47204
5860 [47251]: https://github.com/rust-lang/rust/pull/47251
5861 [47268]: https://github.com/rust-lang/rust/pull/47268
5862 [47282]: https://github.com/rust-lang/rust/pull/47282
5863 [47300]: https://github.com/rust-lang/rust/pull/47300
5864 [47349]: https://github.com/rust-lang/rust/pull/47349
5865 [46931]: https://github.com/rust-lang/rust/pull/46931
5866 [46985]: https://github.com/rust-lang/rust/pull/46985
5867 [47006]: https://github.com/rust-lang/rust/pull/47006
5868 [46830]: https://github.com/rust-lang/rust/pull/46830
5869 [46095]: https://github.com/rust-lang/rust/pull/46095
5870 [46666]: https://github.com/rust-lang/rust/pull/46666
5871 [46196]: https://github.com/rust-lang/rust/pull/46196
5872 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5873 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5874 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5875 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5876 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5879 Version 1.24.1 (2018-03-01)
5880 ==========================
5882 - [Do not abort when unwinding through FFI][48251]
5883 - [Emit UTF-16 files for linker arguments on Windows][48318]
5884 - [Make the error index generator work again][48308]
5885 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5887 [48251]: https://github.com/rust-lang/rust/issues/48251
5888 [48308]: https://github.com/rust-lang/rust/issues/48308
5889 [48318]: https://github.com/rust-lang/rust/issues/48318
5890 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5893 Version 1.24.0 (2018-02-15)
5894 ==========================
5898 - [External `sysv64` ffi is now available.][46528]
5899 eg. `extern "sysv64" fn foo () {}`
5903 - [rustc now uses 16 codegen units by default for release builds.][46910]
5904 For the fastest builds, utilize `codegen-units=1`.
5905 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5906 - [Add `aarch64-unknown-openbsd` support][46760]
5910 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5911 improvement in performance in the majority of cases.
5912 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5913 with Windows.][46798]
5914 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5915 - [impl `From<bool>` for `AtomicBool`][46293]
5916 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5917 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5918 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5919 - [float::from_bits now just uses transmute.][46012] This provides
5920 some optimisations from LLVM.
5921 - [Copied `AsciiExt` methods onto `char`][46077]
5922 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5923 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5924 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5925 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5929 - [`RefCell::replace`]
5931 - [`atomic::spin_loop_hint`]
5933 The following functions can now be used in a constant expression.
5934 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5936 - [`AtomicBool::new`][46287]
5937 - [`AtomicUsize::new`][46287]
5938 - [`AtomicIsize::new`][46287]
5939 - [`AtomicPtr::new`][46287]
5940 - [`Cell::new`][46287]
5941 - [`{integer}::min_value`][46287]
5942 - [`{integer}::max_value`][46287]
5943 - [`mem::size_of`][46287]
5944 - [`mem::align_of`][46287]
5945 - [`ptr::null`][46287]
5946 - [`ptr::null_mut`][46287]
5947 - [`RefCell::new`][46287]
5948 - [`UnsafeCell::new`][46287]
5952 - [Added a `workspace.default-members` config that
5953 overrides implied `--all` in virtual workspaces.][cargo/4743]
5954 - [Enable incremental by default on development builds.][cargo/4817] Also added
5955 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5956 per-project or global basis respectively.
5963 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5964 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5965 in accordance with IETF RFC 4291 §2.2.
5966 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5967 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5968 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5969 - [Leading zeros in tuple struct members is now an error][47084]
5970 - [`column!()` macro is one-based instead of zero-based][46977]
5971 - [`fmt::Arguments` can no longer be shared across threads][45198]
5972 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5973 - [Cargo sets a different working directory for the compiler][cargo/4788]
5975 [44884]: https://github.com/rust-lang/rust/pull/44884
5976 [45198]: https://github.com/rust-lang/rust/pull/45198
5977 [45506]: https://github.com/rust-lang/rust/pull/45506
5978 [45990]: https://github.com/rust-lang/rust/pull/45990
5979 [46012]: https://github.com/rust-lang/rust/pull/46012
5980 [46077]: https://github.com/rust-lang/rust/pull/46077
5981 [46094]: https://github.com/rust-lang/rust/pull/46094
5982 [46284]: https://github.com/rust-lang/rust/pull/46284
5983 [46287]: https://github.com/rust-lang/rust/pull/46287
5984 [46293]: https://github.com/rust-lang/rust/pull/46293
5985 [46528]: https://github.com/rust-lang/rust/pull/46528
5986 [46671]: https://github.com/rust-lang/rust/pull/46671
5987 [46713]: https://github.com/rust-lang/rust/pull/46713
5988 [46735]: https://github.com/rust-lang/rust/pull/46735
5989 [46760]: https://github.com/rust-lang/rust/pull/46760
5990 [46798]: https://github.com/rust-lang/rust/pull/46798
5991 [46828]: https://github.com/rust-lang/rust/pull/46828
5992 [46831]: https://github.com/rust-lang/rust/pull/46831
5993 [46833]: https://github.com/rust-lang/rust/pull/46833
5994 [46910]: https://github.com/rust-lang/rust/pull/46910
5995 [46977]: https://github.com/rust-lang/rust/pull/46977
5996 [47018]: https://github.com/rust-lang/rust/pull/47018
5997 [47080]: https://github.com/rust-lang/rust/pull/47080
5998 [47084]: https://github.com/rust-lang/rust/pull/47084
5999 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6000 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6001 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6002 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6003 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6004 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6007 Version 1.23.0 (2018-01-04)
6008 ==========================
6012 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6013 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6014 Which should fix some confusing errors in some operations.
6018 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6019 undefined behavior.][45920]
6020 - [rustc now suggests renaming import if names clash.][45660]
6021 - [Display errors/warnings correctly when there are zero-width or
6022 wide characters.][45711]
6023 - [rustc now avoids unnecessary copies of arguments that are
6024 simple bindings][45380] This should improve memory usage on average by 5-10%.
6025 - [Updated musl used to build musl rustc to 1.1.17][45393]
6029 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6030 - [Implement Hash for raw pointers to unsized types][45483]
6031 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6032 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6033 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6034 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6035 and `<*mut T>::as_mut`][44932]
6036 - [Optimized `Thread::{park, unpark}` implementation][45524]
6037 - [Improved `SliceExt::binary_search` performance.][45333]
6038 - [impl `FromIterator<()>` for `()`][45379]
6039 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6047 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6048 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6049 - [Added unit test checking to `cargo check`][cargo/4592]
6050 - [Cargo now lets you install a specific version
6051 using `cargo install --version`][cargo/4637]
6055 - [Releases now ship with the Cargo book documentation.][45692]
6056 - [rustdoc now prints rendering warnings on every run.][45324]
6060 - [Changes have been made to type equality to make it more correct,
6061 in rare cases this could break some code.][45853] [Tracking issue for
6062 further information][45852]
6063 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6064 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6065 Android 9, the minimum supported version is Android 14.
6066 - [Bumped the minimum LLVM to 3.9][45326]
6068 [44042]: https://github.com/rust-lang/rust/pull/44042
6069 [44932]: https://github.com/rust-lang/rust/pull/44932
6070 [45267]: https://github.com/rust-lang/rust/pull/45267
6071 [45324]: https://github.com/rust-lang/rust/pull/45324
6072 [45326]: https://github.com/rust-lang/rust/pull/45326
6073 [45333]: https://github.com/rust-lang/rust/pull/45333
6074 [45379]: https://github.com/rust-lang/rust/pull/45379
6075 [45380]: https://github.com/rust-lang/rust/pull/45380
6076 [45393]: https://github.com/rust-lang/rust/pull/45393
6077 [45435]: https://github.com/rust-lang/rust/pull/45435
6078 [45483]: https://github.com/rust-lang/rust/pull/45483
6079 [45524]: https://github.com/rust-lang/rust/pull/45524
6080 [45571]: https://github.com/rust-lang/rust/pull/45571
6081 [45580]: https://github.com/rust-lang/rust/pull/45580
6082 [45610]: https://github.com/rust-lang/rust/pull/45610
6083 [45660]: https://github.com/rust-lang/rust/pull/45660
6084 [45692]: https://github.com/rust-lang/rust/pull/45692
6085 [45711]: https://github.com/rust-lang/rust/pull/45711
6086 [45772]: https://github.com/rust-lang/rust/pull/45772
6087 [45852]: https://github.com/rust-lang/rust/issues/45852
6088 [45853]: https://github.com/rust-lang/rust/pull/45853
6089 [45887]: https://github.com/rust-lang/rust/pull/45887
6090 [45920]: https://github.com/rust-lang/rust/pull/45920
6091 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6092 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6093 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6096 Version 1.22.1 (2017-11-22)
6097 ==========================
6099 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6101 [46183]: https://github.com/rust-lang/rust/pull/46183
6103 Version 1.22.0 (2017-11-22)
6104 ==========================
6108 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6109 - [Now accepts underscores in unicode escapes][43716]
6110 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6111 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6115 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6116 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6117 This should decrease compile times for debug builds.
6118 - [strict memory alignment now enabled on ARMv6][45094]
6119 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6123 - [Allow atomic operations up to 32 bits
6124 on `armv5te_unknown_linux_gnueabi`][44978]
6125 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6126 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6127 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6128 - [Properly detect overflow in `Instant += Duration`.][44220]
6129 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6130 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6131 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6138 - [Cargo will now build multi file examples in subdirectories of the `examples`
6139 folder that have a `main.rs` file.][cargo/4496]
6140 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6141 the old format will continue to work and can be updated with `cargo update`.
6142 - [Now supports vendoring git repositories][cargo/3992]
6146 - [`libbacktrace` is now available on Apple platforms.][44251]
6147 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6148 This now lets you specify that a given code example will fail to compile.
6152 - [The minimum Android version that rustc can build for has been bumped
6153 to `4.0` from `2.3`][45656]
6154 - [Allowing `T op= &T` for numeric types has broken some type
6155 inference cases][45480]
6158 [42526]: https://github.com/rust-lang/rust/pull/42526
6159 [43716]: https://github.com/rust-lang/rust/pull/43716
6160 [43949]: https://github.com/rust-lang/rust/pull/43949
6161 [44015]: https://github.com/rust-lang/rust/pull/44015
6162 [44220]: https://github.com/rust-lang/rust/pull/44220
6163 [44251]: https://github.com/rust-lang/rust/pull/44251
6164 [44287]: https://github.com/rust-lang/rust/pull/44287
6165 [44303]: https://github.com/rust-lang/rust/pull/44303
6166 [44456]: https://github.com/rust-lang/rust/pull/44456
6167 [44466]: https://github.com/rust-lang/rust/pull/44466
6168 [44895]: https://github.com/rust-lang/rust/pull/44895
6169 [44966]: https://github.com/rust-lang/rust/pull/44966
6170 [44978]: https://github.com/rust-lang/rust/pull/44978
6171 [45041]: https://github.com/rust-lang/rust/pull/45041
6172 [45064]: https://github.com/rust-lang/rust/pull/45064
6173 [45075]: https://github.com/rust-lang/rust/pull/45075
6174 [45094]: https://github.com/rust-lang/rust/pull/45094
6175 [45095]: https://github.com/rust-lang/rust/pull/45095
6176 [45480]: https://github.com/rust-lang/rust/issues/45480
6177 [45656]: https://github.com/rust-lang/rust/pull/45656
6178 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6179 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6180 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6187 Version 1.21.0 (2017-10-12)
6188 ==========================
6192 - [You can now use static references for literals.][43838]
6196 let x: &'static u32 = &0;
6199 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6202 my_macro!(Vec<i32>::new); // Always worked
6203 my_macro!(Vec::<i32>::new); // Now works
6208 - [Upgraded jemalloc to 4.5.0][43911]
6209 - [Enabled unwinding panics on Redox][43917]
6210 - [Now runs LLVM in parallel during translation phase.][43506]
6211 This should reduce peak memory usage.
6215 - [Generate builtin impls for `Clone` for all arrays and tuples that
6216 are `T: Clone`][43690]
6217 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6218 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6219 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6224 [`std::mem::discriminant`]
6228 - [You can now call `cargo install` with multiple package names][cargo/4216]
6229 - [Cargo commands inside a virtual workspace will now implicitly
6230 pass `--all`][cargo/4335]
6231 - [Added a `[patch]` section to `Cargo.toml` to handle
6232 prepublication dependencies][cargo/4123] [RFC 1969]
6233 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6234 like patterns][cargo/4270]
6235 - [Added the `--all-targets` option][cargo/4400]
6236 - [Using required dependencies as a feature is now deprecated and emits
6237 a warning][cargo/4364]
6242 - [Cargo docs are moving][43916]
6243 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6244 - [The rustdoc book is now available][43863]
6245 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6246 - [Added a preview of RLS has been made available through rustup][44204]
6247 Install with `rustup component add rls-preview`
6248 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6249 Previously only showed `std::os::unix`.
6253 - [Changes in method matching against higher-ranked types][43880] This may cause
6254 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6255 - [rustc's JSON error output's byte position start at top of file.][42973]
6256 Was previously relative to the rustc's internal `CodeMap` struct which
6257 required the unstable library `libsyntax` to correctly use.
6258 - [`unused_results` lint no longer ignores booleans][43728]
6260 [42565]: https://github.com/rust-lang/rust/pull/42565
6261 [42973]: https://github.com/rust-lang/rust/pull/42973
6262 [43348]: https://github.com/rust-lang/rust/pull/43348
6263 [43459]: https://github.com/rust-lang/rust/pull/43459
6264 [43506]: https://github.com/rust-lang/rust/pull/43506
6265 [43540]: https://github.com/rust-lang/rust/pull/43540
6266 [43690]: https://github.com/rust-lang/rust/pull/43690
6267 [43728]: https://github.com/rust-lang/rust/pull/43728
6268 [43838]: https://github.com/rust-lang/rust/pull/43838
6269 [43863]: https://github.com/rust-lang/rust/pull/43863
6270 [43880]: https://github.com/rust-lang/rust/pull/43880
6271 [43911]: https://github.com/rust-lang/rust/pull/43911
6272 [43916]: https://github.com/rust-lang/rust/pull/43916
6273 [43917]: https://github.com/rust-lang/rust/pull/43917
6274 [44204]: https://github.com/rust-lang/rust/pull/44204
6275 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6276 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6277 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6278 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6279 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6280 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6281 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6282 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6283 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6285 Version 1.20.0 (2017-08-31)
6286 ===========================
6290 - [Associated constants are now stabilised.][42809]
6291 - [A lot of macro bugs are now fixed.][42913]
6296 - [Struct fields are now properly coerced to the expected field type.][42807]
6297 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6298 `wasm32-experimental-emscripten` target.
6299 - [Changed some of the error messages to be more helpful.][42033]
6300 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6302 - [rustc now reports the total number of errors on compilation failure][43015]
6303 previously this was only the number of errors in the pass that failed.
6304 - [Expansion in rustc has been sped up 29x.][42533]
6305 - [added `msp430-none-elf` target.][43099]
6306 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6308 - [Fixes backtraces on Redox][43228]
6309 - [rustc now identifies different versions of same crate when absolute paths of
6310 different types match in an error message.][42826]
6316 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6317 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6319 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6320 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6321 - [Impl `Clone` for `DefaultHasher`.][42799]
6322 - [Impl `Sync` for `SyncSender`.][42397]
6323 - [Impl `FromStr` for `char`][42271]
6324 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6326 - [allow messages in the `unimplemented!()` macro.][42155]
6327 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6328 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6329 - [Upgrade to Unicode 10.0.0][42999]
6330 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6331 - [Skip the main thread's manual stack guard on Linux][43072]
6332 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6333 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6335 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6340 - [`CStr::into_c_string`]
6341 - [`CString::as_c_str`]
6342 - [`CString::into_boxed_c_str`]
6343 - [`Chain::get_mut`]
6344 - [`Chain::get_ref`]
6345 - [`Chain::into_inner`]
6346 - [`Option::get_or_insert_with`]
6347 - [`Option::get_or_insert`]
6348 - [`OsStr::into_os_string`]
6349 - [`OsString::into_boxed_os_str`]
6352 - [`Utf8Error::error_len`]
6353 - [`char::EscapeDebug`]
6354 - [`char::escape_debug`]
6355 - [`compile_error!`]
6356 - [`f32::from_bits`]
6358 - [`f64::from_bits`]
6360 - [`mem::ManuallyDrop`]
6361 - [`slice::sort_unstable_by_key`]
6362 - [`slice::sort_unstable_by`]
6363 - [`slice::sort_unstable`]
6364 - [`str::from_boxed_utf8_unchecked`]
6365 - [`str::as_bytes_mut`]
6366 - [`str::as_bytes_mut`]
6367 - [`str::from_utf8_mut`]
6368 - [`str::from_utf8_unchecked_mut`]
6370 - [`str::get_unchecked_mut`]
6371 - [`str::get_unchecked`]
6373 - [`str::into_boxed_bytes`]
6378 - [Cargo API token location moved from `~/.cargo/config` to
6379 `~/.cargo/credentials`.][cargo/3978]
6380 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6381 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6382 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6383 - [You can now specify version of a binary when installed through
6384 `cargo install` using `--vers`.][cargo/4229]
6385 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6386 failure.][cargo/4248]
6387 - [Changed the convention around which file is the crate root.][cargo/4259]
6392 - [Functions with `'static` in their return types will now not be as usable as
6393 if they were using lifetime parameters instead.][42417]
6394 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6395 takes the sign of NaN into account where previously didn't.][42430]
6397 [42033]: https://github.com/rust-lang/rust/pull/42033
6398 [42155]: https://github.com/rust-lang/rust/pull/42155
6399 [42271]: https://github.com/rust-lang/rust/pull/42271
6400 [42397]: https://github.com/rust-lang/rust/pull/42397
6401 [42417]: https://github.com/rust-lang/rust/pull/42417
6402 [42430]: https://github.com/rust-lang/rust/pull/42430
6403 [42431]: https://github.com/rust-lang/rust/pull/42431
6404 [42533]: https://github.com/rust-lang/rust/pull/42533
6405 [42571]: https://github.com/rust-lang/rust/pull/42571
6406 [42613]: https://github.com/rust-lang/rust/pull/42613
6407 [42799]: https://github.com/rust-lang/rust/pull/42799
6408 [42807]: https://github.com/rust-lang/rust/pull/42807
6409 [42809]: https://github.com/rust-lang/rust/pull/42809
6410 [42822]: https://github.com/rust-lang/rust/pull/42822
6411 [42826]: https://github.com/rust-lang/rust/pull/42826
6412 [42854]: https://github.com/rust-lang/rust/pull/42854
6413 [42913]: https://github.com/rust-lang/rust/pull/42913
6414 [42999]: https://github.com/rust-lang/rust/pull/42999
6415 [43011]: https://github.com/rust-lang/rust/pull/43011
6416 [43015]: https://github.com/rust-lang/rust/pull/43015
6417 [43072]: https://github.com/rust-lang/rust/pull/43072
6418 [43077]: https://github.com/rust-lang/rust/pull/43077
6419 [43097]: https://github.com/rust-lang/rust/pull/43097
6420 [43099]: https://github.com/rust-lang/rust/pull/43099
6421 [43170]: https://github.com/rust-lang/rust/pull/43170
6422 [43178]: https://github.com/rust-lang/rust/pull/43178
6423 [43185]: https://github.com/rust-lang/rust/pull/43185
6424 [43228]: https://github.com/rust-lang/rust/pull/43228
6425 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6426 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6427 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6428 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6429 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6430 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6431 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6432 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6433 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6434 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6435 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6436 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6437 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6438 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6439 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6440 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6441 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6442 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6443 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6444 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6445 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6446 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6447 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6448 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6449 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6450 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6451 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6452 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6453 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6454 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6455 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6456 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6457 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6458 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6459 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6460 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6461 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6462 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6465 Version 1.19.0 (2017-07-20)
6466 ===========================
6471 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6472 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6473 - [Macro recursion limit increased to 1024 from 64.][41676]
6474 - [Added lint for detecting unused macros.][41907]
6475 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6476 For example: `let x = loop { break 7; };`
6477 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6478 contain `Copy` types and cannot have a `Drop` implementation.
6479 Example: `union Foo { bar: u8, baz: usize }`
6480 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6481 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6486 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6487 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6488 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6489 you should use `--target armv7-linux-androideabi`.
6490 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6491 - [Minor optimisation of string operations.][42037]
6492 - [Compiler error message is now `aborting due to previous error(s)` instead of
6493 `aborting due to N previous errors`][42150] This was previously inaccurate and
6494 would only count certain kinds of errors.
6495 - [The compiler now supports Visual Studio 2017][42225]
6496 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6497 - [Added a lot][42264] of [new error codes][42302]
6498 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6499 libraries with C Run-time Libraries(CRT) to be statically linked.
6500 - [Fixed various ARM codegen bugs][42740]
6505 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6506 `Extend<Cow<'a, str>>`][41449]
6507 - [`Vec` now implements `From<&mut [T]>`][41530]
6508 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6509 - [`SplitWhitespace` now implements `Clone`][41659]
6510 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6512 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6513 macros, but for printing to stderr.
6518 - [`OsString::shrink_to_fit`]
6521 - [`thread::ThreadId`]
6526 - [Build scripts can now add environment variables to the environment
6527 the crate is being compiled in.
6528 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6529 - [Subcommands now replace the current process rather than spawning a new
6530 child process][cargo/3970]
6531 - [Workspace members can now accept glob file patterns][cargo/3979]
6532 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6533 the members in a given workspace.][cargo/3988]
6534 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6535 - [Target directory path is now in the cargo metadata][cargo/4022]
6536 - [Cargo no longer checks out a local working directory for the
6537 crates.io index][cargo/4026] This should provide smaller file size for the
6538 registry, and improve cloning times, especially on Windows machines.
6539 - [Added an `--exclude` option for excluding certain packages when using the
6540 `--all` option][cargo/4031]
6541 - [Cargo will now automatically retry when receiving a 5xx error
6542 from crates.io][cargo/4032]
6543 - [The `--features` option now accepts multiple comma or space
6544 delimited values.][cargo/4084]
6545 - [Added support for custom target specific runners][cargo/3954]
6550 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6552 - [Rust will now release XZ compressed packages][rust-installer/57]
6553 - [rustup will now prefer to download rust packages with
6554 XZ compression][rustup/1100] over GZip packages.
6555 - [Added the ability to escape `#` in rust documentation][41785] By adding
6556 additional `#`'s ie. `##` is now `#`
6561 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6562 - [`-Z` flags are now no longer allowed to be used on the stable
6563 compiler.][41751] This has been a warning for a year previous to this.
6564 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6565 longer works][42844]. Users should migrate to the built-in `check`
6566 command, which has been available since 1.16.
6567 - [Ending a float literal with `._` is now a hard error.
6568 Example: `42._` .][41946]
6569 - [Any use of a private `extern crate` outside of its module is now a
6570 hard error.][36886] This was previously a warning.
6571 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6572 relative while the `::` prefix makes a path absolute, but was ignored and the
6573 path was relative regardless.
6574 - [Floating point constants in match patterns is now a hard error][36890]
6575 This was previously a warning.
6576 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6577 match patterns is now a hard error][36891] This was previously a warning.
6578 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6580 - [From the pound escape, lines consisting of multiple `#`s are
6582 - [It is an error to re-export private enum variants][42460]. This is
6583 known to break a number of crates that depend on an older version of
6585 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6586 to use it to find the linker, and the build will fail where it did
6587 not previously][42607]
6589 [36886]: https://github.com/rust-lang/rust/issues/36886
6590 [36888]: https://github.com/rust-lang/rust/issues/36888
6591 [36890]: https://github.com/rust-lang/rust/issues/36890
6592 [36891]: https://github.com/rust-lang/rust/issues/36891
6593 [36892]: https://github.com/rust-lang/rust/issues/36892
6594 [37406]: https://github.com/rust-lang/rust/issues/37406
6595 [39983]: https://github.com/rust-lang/rust/pull/39983
6596 [41145]: https://github.com/rust-lang/rust/pull/41145
6597 [41192]: https://github.com/rust-lang/rust/pull/41192
6598 [41258]: https://github.com/rust-lang/rust/pull/41258
6599 [41370]: https://github.com/rust-lang/rust/pull/41370
6600 [41449]: https://github.com/rust-lang/rust/pull/41449
6601 [41530]: https://github.com/rust-lang/rust/pull/41530
6602 [41624]: https://github.com/rust-lang/rust/pull/41624
6603 [41656]: https://github.com/rust-lang/rust/pull/41656
6604 [41659]: https://github.com/rust-lang/rust/pull/41659
6605 [41676]: https://github.com/rust-lang/rust/pull/41676
6606 [41751]: https://github.com/rust-lang/rust/pull/41751
6607 [41764]: https://github.com/rust-lang/rust/pull/41764
6608 [41785]: https://github.com/rust-lang/rust/pull/41785
6609 [41873]: https://github.com/rust-lang/rust/pull/41873
6610 [41907]: https://github.com/rust-lang/rust/pull/41907
6611 [41946]: https://github.com/rust-lang/rust/pull/41946
6612 [42016]: https://github.com/rust-lang/rust/pull/42016
6613 [42037]: https://github.com/rust-lang/rust/pull/42037
6614 [42068]: https://github.com/rust-lang/rust/pull/42068
6615 [42150]: https://github.com/rust-lang/rust/pull/42150
6616 [42162]: https://github.com/rust-lang/rust/pull/42162
6617 [42225]: https://github.com/rust-lang/rust/pull/42225
6618 [42264]: https://github.com/rust-lang/rust/pull/42264
6619 [42302]: https://github.com/rust-lang/rust/pull/42302
6620 [42460]: https://github.com/rust-lang/rust/issues/42460
6621 [42607]: https://github.com/rust-lang/rust/issues/42607
6622 [42740]: https://github.com/rust-lang/rust/pull/42740
6623 [42844]: https://github.com/rust-lang/rust/issues/42844
6624 [42948]: https://github.com/rust-lang/rust/pull/42948
6625 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6626 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6627 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6628 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6629 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6630 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6631 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6632 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6633 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6634 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6635 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6636 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6637 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6638 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6639 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6640 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6641 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6642 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6643 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6644 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6645 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6646 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6649 Version 1.18.0 (2017-06-08)
6650 ===========================
6655 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6656 make the item visible to just that module tree. Also accepts the keyword
6657 `crate` to make something public to the whole crate but not users of the
6658 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6659 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6660 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6661 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6662 types like `Write + Send`, trailing `+` are now supported in trait objects,
6663 and better error reporting for trait objects starting with `?Sized`.
6664 - [0e+10 is now a valid floating point literal][40589]
6665 - [Now warns if you bind a lifetime parameter to 'static][40734]
6666 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6667 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6668 representation in some cases.][40377]
6673 - [rustc can now emit mir with `--emit mir`][39891]
6674 - [Improved LLVM IR for trivial functions][40367]
6675 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6676 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6677 opportunities found through profiling
6678 - [Improved backtrace formatting when panicking][38165]
6683 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6684 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6685 iteration or reallocation.
6686 - [Simplified HashMap Bucket interface][40561] provides performance
6687 improvements for iterating and cloning.
6688 - [Specialize Vec::from_elem to use calloc][40409]
6689 - [Fixed Race condition in fs::create_dir_all][39799]
6690 - [No longer caching stdio on Windows][40516]
6691 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6692 2.50%~ faster and in one case now 12.50% faster.
6693 - [Optimized `AtomicBool::fetch_nand`][41143]
6698 - [`Child::try_wait`]
6699 - [`HashMap::retain`]
6700 - [`HashSet::retain`]
6702 - [`TcpStream::peek`]
6703 - [`UdpSocket::peek`]
6704 - [`UdpSocket::peek_from`]
6709 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6710 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6711 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6712 - [Added Android build support][cargo/3885]
6713 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6714 of a certain type, for example `cargo build --bins` will build all
6716 - [Added support for haiku][cargo/3952]
6721 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6722 - [Rust now uses the official cross compiler for NetBSD][40612]
6723 - [rustdoc now accepts `#` at the start of files][40828]
6724 - [Fixed jemalloc support for musl][41168]
6729 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6730 always placed after the sign if it exists and before the digits. With the `#`
6731 flag the zeroes are placed after the prefix and before the digits.
6732 - [Due to the struct field optimisation][40377], using `transmute` on structs
6733 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6734 always been undefined behavior, but is now more likely to break in practice.
6735 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6736 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6737 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6738 - [Overlapping inherent `impl`s are now a hard error][40728]
6739 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6740 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6741 `out.asm` and `out.ll` instead of only one of the filetypes.
6742 - [ calling a function that returns `Self` will no longer work][41805] when
6743 the size of `Self` cannot be statically determined.
6744 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6745 this has caused a few regressions namely:
6747 - Changed the link order of local static/dynamic libraries (respecting the
6748 order on given rather than having the compiler reorder).
6749 - Changed how MinGW is linked, native code linked to dynamic libraries
6750 may require manually linking to the gcc support library (for the native
6753 [38165]: https://github.com/rust-lang/rust/pull/38165
6754 [39799]: https://github.com/rust-lang/rust/pull/39799
6755 [39891]: https://github.com/rust-lang/rust/pull/39891
6756 [40043]: https://github.com/rust-lang/rust/pull/40043
6757 [40241]: https://github.com/rust-lang/rust/pull/40241
6758 [40338]: https://github.com/rust-lang/rust/pull/40338
6759 [40367]: https://github.com/rust-lang/rust/pull/40367
6760 [40377]: https://github.com/rust-lang/rust/pull/40377
6761 [40409]: https://github.com/rust-lang/rust/pull/40409
6762 [40516]: https://github.com/rust-lang/rust/pull/40516
6763 [40556]: https://github.com/rust-lang/rust/pull/40556
6764 [40561]: https://github.com/rust-lang/rust/pull/40561
6765 [40589]: https://github.com/rust-lang/rust/pull/40589
6766 [40612]: https://github.com/rust-lang/rust/pull/40612
6767 [40723]: https://github.com/rust-lang/rust/pull/40723
6768 [40728]: https://github.com/rust-lang/rust/pull/40728
6769 [40731]: https://github.com/rust-lang/rust/pull/40731
6770 [40734]: https://github.com/rust-lang/rust/pull/40734
6771 [40805]: https://github.com/rust-lang/rust/pull/40805
6772 [40807]: https://github.com/rust-lang/rust/pull/40807
6773 [40828]: https://github.com/rust-lang/rust/pull/40828
6774 [40870]: https://github.com/rust-lang/rust/pull/40870
6775 [41085]: https://github.com/rust-lang/rust/pull/41085
6776 [41143]: https://github.com/rust-lang/rust/pull/41143
6777 [41168]: https://github.com/rust-lang/rust/pull/41168
6778 [41270]: https://github.com/rust-lang/rust/issues/41270
6779 [41469]: https://github.com/rust-lang/rust/pull/41469
6780 [41805]: https://github.com/rust-lang/rust/issues/41805
6781 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6782 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6783 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6784 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6785 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6786 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6787 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6788 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6789 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6790 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6791 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6792 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6793 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6794 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6797 Version 1.17.0 (2017-04-27)
6798 ===========================
6803 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6804 * [Fields of structs may be initialized without duplicating the field/variable
6805 names][39761]. [RFC 1682]
6806 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6807 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6808 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6809 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6810 `'b`. Soundness fix.
6811 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6812 * [Static variables may contain references to other statics][40027]
6817 * [Exit quickly on only `--emit dep-info`][40336]
6818 * [Make `-C relocation-model` more correctly determine whether the linker
6819 creates a position-independent executable][40245]
6820 * [Add `-C overflow-checks` to directly control whether integer overflow
6822 * [The rustc type checker now checks items on demand instead of in a single
6823 in-order pass][40008]. This is mostly an internal refactoring in support of
6824 future work, including incremental type checking, but also resolves [RFC
6825 1647], allowing `Self` to appear in `impl` `where` clauses.
6826 * [Optimize vtable loads][39995]
6827 * [Turn off vectorization for Emscripten targets][39990]
6828 * [Provide suggestions for unknown macros imported with `use`][39953]
6829 * [Fix ICEs in path resolution][39939]
6830 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6831 * [Add clearer error message using `&str + &str`][39116]
6842 * [`Ordering::then`]
6843 * [`Ordering::then_with`]
6844 * [`BTreeMap::range`]
6845 * [`BTreeMap::range_mut`]
6846 * [`collections::Bound`]
6847 * [`process::abort`]
6848 * [`ptr::read_unaligned`]
6849 * [`ptr::write_unaligned`]
6850 * [`Result::expect_err`]
6853 * [`Cell::into_inner`]
6859 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6860 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6861 * [`String` implements `FromIterator<&char>`][40028]
6862 * `Box` [implements][40009] a number of new conversions:
6863 `From<Box<str>> for String`,
6864 `From<Box<[T]>> for Vec<T>`,
6865 `From<Box<CStr>> for CString`,
6866 `From<Box<OsStr>> for OsString`,
6867 `From<Box<Path>> for PathBuf`,
6868 `Into<Box<str>> for String`,
6869 `Into<Box<[T]>> for Vec<T>`,
6870 `Into<Box<CStr>> for CString`,
6871 `Into<Box<OsStr>> for OsString`,
6872 `Into<Box<Path>> for PathBuf`,
6873 `Default for Box<str>`,
6874 `Default for Box<CStr>`,
6875 `Default for Box<OsStr>`,
6876 `From<&CStr> for Box<CStr>`,
6877 `From<&OsStr> for Box<OsStr>`,
6878 `From<&Path> for Box<Path>`
6879 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6880 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6881 * [Slightly optimize `slice::sort`][39538]
6882 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6883 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6884 `Box<str>` implements `From<&str>`][39438]
6885 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6886 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6887 * [`format!` estimates the needed capacity before writing a string][39356]
6888 * [Support unprivileged symlink creation in Windows][38921]
6889 * [`PathBuf` implements `Default`][38764]
6890 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6891 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6892 and poor hash functions.
6897 * [Add `cargo check --all`][cargo/3731]
6898 * [Add an option to ignore SSL revocation checking][cargo/3699]
6899 * [Add `cargo run --package`][cargo/3691]
6900 * [Add `required_features`][cargo/3667]
6901 * [Assume `build.rs` is a build script][cargo/3664]
6902 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6907 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6909 * [The "Unstable Book" documents nightly-only features][ubook]
6910 * [Improve the style of the sidebar in rustdoc output][40265]
6911 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6912 * [Fix MSP430 breakage due to `i128`][40257]
6913 * [Preliminary Solaris/SPARCv9 support][39903]
6914 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6915 run without installing the MSVC runtime.
6916 * [`rustdoc --test` includes file names in test names][39788]
6917 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6918 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6919 * [Initial support for `aarch64-unknown-freebsd`][39491]
6920 * [Initial support for `i686-unknown-netbsd`][39426]
6921 * [This release no longer includes the old makefile build system][39431]. Rust
6922 is built with a custom build system, written in Rust, and with Cargo.
6923 * [Add Debug implementations for libcollection structs][39002]
6924 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6925 * [`--test-threads=0` produces an error][38945]
6926 * [`rustup` installs documentation by default][40526]
6927 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6928 WinDbg and Visual Studio to improve the debugging experience.
6933 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6934 workaround, either use MSVC 2015 or run vcvars.bat.
6935 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6936 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6937 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6939 * [`format!` and `Display::to_string` panic if an underlying formatting
6940 implementation returns an error][40117]. Previously the error was silently
6941 ignored. It is incorrect for `write_fmt` to return an error when writing
6943 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6944 crates were marked stable and could be accessed from the stable toolchain.
6945 * [Rust git source no longer includes vendored crates][39728]. Those that need
6946 to build with vendored crates should build from release tarballs.
6947 * [Fix inert attributes from `proc_macro_derives`][39572]
6948 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6949 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6951 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6952 existing code generally ignores the type of dead-code unless a type-hint is
6953 provided; this can cause surprising inference interactions particularly around
6954 defaulting. The new code uniformly ignores the result type of dead-code.
6955 * [Tuple-struct constructors with private fields are no longer visible][38932]
6956 * [Lifetime parameters that do not appear in the arguments are now considered
6957 early-bound][38897], resolving a soundness bug (#[32330]). The
6958 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6960 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6961 * [Make transmuting from fn item types to pointer-sized types a hard
6964 [27787]: https://github.com/rust-lang/rust/issues/27787
6965 [32330]: https://github.com/rust-lang/rust/issues/32330
6966 [34198]: https://github.com/rust-lang/rust/pull/34198
6967 [38161]: https://github.com/rust-lang/rust/pull/38161
6968 [38368]: https://github.com/rust-lang/rust/pull/38368
6969 [38584]: https://github.com/rust-lang/rust/issues/38584
6970 [38661]: https://github.com/rust-lang/rust/pull/38661
6971 [38764]: https://github.com/rust-lang/rust/pull/38764
6972 [38864]: https://github.com/rust-lang/rust/issues/38864
6973 [38897]: https://github.com/rust-lang/rust/pull/38897
6974 [38921]: https://github.com/rust-lang/rust/pull/38921
6975 [38932]: https://github.com/rust-lang/rust/pull/38932
6976 [38945]: https://github.com/rust-lang/rust/pull/38945
6977 [38981]: https://github.com/rust-lang/rust/pull/38981
6978 [39002]: https://github.com/rust-lang/rust/pull/39002
6979 [39116]: https://github.com/rust-lang/rust/pull/39116
6980 [39193]: https://github.com/rust-lang/rust/pull/39193
6981 [39265]: https://github.com/rust-lang/rust/pull/39265
6982 [39356]: https://github.com/rust-lang/rust/pull/39356
6983 [39372]: https://github.com/rust-lang/rust/pull/39372
6984 [39426]: https://github.com/rust-lang/rust/pull/39426
6985 [39431]: https://github.com/rust-lang/rust/pull/39431
6986 [39438]: https://github.com/rust-lang/rust/pull/39438
6987 [39440]: https://github.com/rust-lang/rust/pull/39440
6988 [39485]: https://github.com/rust-lang/rust/pull/39485
6989 [39491]: https://github.com/rust-lang/rust/pull/39491
6990 [39518]: https://github.com/rust-lang/rust/pull/39518
6991 [39538]: https://github.com/rust-lang/rust/pull/39538
6992 [39572]: https://github.com/rust-lang/rust/pull/39572
6993 [39633]: https://github.com/rust-lang/rust/pull/39633
6994 [39642]: https://github.com/rust-lang/rust/pull/39642
6995 [39728]: https://github.com/rust-lang/rust/pull/39728
6996 [39761]: https://github.com/rust-lang/rust/pull/39761
6997 [39788]: https://github.com/rust-lang/rust/pull/39788
6998 [39793]: https://github.com/rust-lang/rust/pull/39793
6999 [39837]: https://github.com/rust-lang/rust/pull/39837
7000 [39843]: https://github.com/rust-lang/rust/pull/39843
7001 [39851]: https://github.com/rust-lang/rust/pull/39851
7002 [39903]: https://github.com/rust-lang/rust/pull/39903
7003 [39939]: https://github.com/rust-lang/rust/pull/39939
7004 [39953]: https://github.com/rust-lang/rust/pull/39953
7005 [39960]: https://github.com/rust-lang/rust/pull/39960
7006 [39990]: https://github.com/rust-lang/rust/pull/39990
7007 [39995]: https://github.com/rust-lang/rust/pull/39995
7008 [40008]: https://github.com/rust-lang/rust/pull/40008
7009 [40009]: https://github.com/rust-lang/rust/pull/40009
7010 [40027]: https://github.com/rust-lang/rust/pull/40027
7011 [40028]: https://github.com/rust-lang/rust/pull/40028
7012 [40037]: https://github.com/rust-lang/rust/pull/40037
7013 [40117]: https://github.com/rust-lang/rust/pull/40117
7014 [40166]: https://github.com/rust-lang/rust/pull/40166
7015 [40245]: https://github.com/rust-lang/rust/pull/40245
7016 [40257]: https://github.com/rust-lang/rust/pull/40257
7017 [40261]: https://github.com/rust-lang/rust/pull/40261
7018 [40265]: https://github.com/rust-lang/rust/pull/40265
7019 [40319]: https://github.com/rust-lang/rust/pull/40319
7020 [40336]: https://github.com/rust-lang/rust/pull/40336
7021 [40526]: https://github.com/rust-lang/rust/pull/40526
7022 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7023 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7024 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7025 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7026 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7027 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7028 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7029 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7030 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7031 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7032 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7033 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7034 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7035 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7036 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7037 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7038 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7039 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7040 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7041 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7042 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7043 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7044 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7045 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7046 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7047 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7048 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7049 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7050 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7051 [ubook]: https://doc.rust-lang.org/unstable-book/
7054 Version 1.16.0 (2017-03-16)
7055 ===========================
7060 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7061 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7062 match patterns][38069]
7063 * [Clean up semantics of `self` in an import list][38313]
7064 * [`Self` may appear in `impl` headers][38920]
7065 * [`Self` may appear in struct expressions][39282]
7070 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7071 a `.rmeta` file containing only crate metadata][38571]. This can be
7072 used by tools like the Rust Language Service to perform
7073 metadata-only builds.
7074 * [Levenshtein based typo suggestions now work in most places, while
7075 previously they worked only for fields and sometimes for local
7076 variables][38927]. Together with the overhaul of "no
7077 resolution"/"unexpected resolution" errors (#[38154]) they result in
7078 large and systematic improvement in resolution diagnostics.
7079 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7081 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7082 * [`rustc` no longer attempts to provide "consider using an explicit
7083 lifetime" suggestions][37057]. They were inaccurate.
7088 * [`VecDeque::truncate`]
7089 * [`VecDeque::resize`]
7090 * [`String::insert_str`]
7091 * [`Duration::checked_add`]
7092 * [`Duration::checked_sub`]
7093 * [`Duration::checked_div`]
7094 * [`Duration::checked_mul`]
7097 * [`SocketAddr::is_ipv4`]
7098 * [`SocketAddr::is_ipv6`]
7099 * [`IpAddr::is_ipv4`]
7100 * [`IpAddr::is_ipv6`]
7102 * [`Vec::dedup_by_key`]
7103 * [`Result::unwrap_or_default`]
7104 * [`<*const T>::wrapping_offset`]
7105 * [`<*mut T>::wrapping_offset`]
7106 * `CommandExt::creation_flags`
7107 * [`File::set_permissions`]
7108 * [`String::split_off`]
7113 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7114 their argument by `Borrow` parameter][37761]
7115 * [All public types in std implement `Debug`][38006]
7116 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7117 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7118 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7120 * [std: Fix partial writes in `LineWriter`][38062]
7121 * [std: Clamp max read/write sizes on Unix][38622]
7122 * [Use more specific panic message for `&str` slicing errors][38066]
7123 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7124 functionality cannot be achieved in std currently.
7125 * [`writeln!`, like `println!`, now accepts a form with no string
7126 or formatting arguments, to just print a newline][38469]
7127 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7128 * [Reduce the size of static data in `std_unicode::tables`][38781]
7129 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7130 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7132 * [`Duration` implements `Sum`][38712]
7133 * [`String` implements `ToSocketAddrs`][39048]
7138 * [The `cargo check` command does a type check of a project without
7139 building it][cargo/3296]
7140 * [crates.io will display CI badges from Travis and AppVeyor, if
7141 specified in Cargo.toml][cargo/3546]
7142 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7143 * [Compilation profiles accept integer values for `debug`, in addition
7144 to `true` and `false`. These are passed to `rustc` as the value to
7145 `-C debuginfo`][cargo/3534]
7146 * [Implement `cargo --version --verbose`][cargo/3604]
7147 * [All builds now output 'dep-info' build dependencies compatible with
7148 make and ninja][cargo/3557]
7149 * [Build all workspace members with `build --all`][cargo/3511]
7150 * [Document all workspace members with `doc --all`][cargo/3515]
7151 * [Path deps outside workspace are not members][cargo/3443]
7156 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7157 the path to the Rust implementation][38589]
7158 * [The `armv7-linux-androideabi` target no longer enables NEON
7159 extensions, per Google's ABI guide][38413]
7160 * [The stock standard library can be compiled for Redox OS][38401]
7161 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7163 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7165 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7170 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7171 match patterns][38069]
7172 * In this release, references to uninhabited types can not be
7173 pattern-matched. This was accidentally allowed in 1.15.
7174 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7175 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7177 * [Clean up semantics of `self` in an import list][38313]
7178 * Reimplemented lifetime elision. This change was almost entirely compatible
7179 with existing code, but it did close a number of small bugs and loopholes,
7180 as well as being more accepting in some other [cases][41105].
7182 [37057]: https://github.com/rust-lang/rust/pull/37057
7183 [37761]: https://github.com/rust-lang/rust/pull/37761
7184 [38006]: https://github.com/rust-lang/rust/pull/38006
7185 [38051]: https://github.com/rust-lang/rust/pull/38051
7186 [38062]: https://github.com/rust-lang/rust/pull/38062
7187 [38622]: https://github.com/rust-lang/rust/pull/38622
7188 [38066]: https://github.com/rust-lang/rust/pull/38066
7189 [38069]: https://github.com/rust-lang/rust/pull/38069
7190 [38131]: https://github.com/rust-lang/rust/pull/38131
7191 [38154]: https://github.com/rust-lang/rust/pull/38154
7192 [38274]: https://github.com/rust-lang/rust/pull/38274
7193 [38304]: https://github.com/rust-lang/rust/pull/38304
7194 [38313]: https://github.com/rust-lang/rust/pull/38313
7195 [38327]: https://github.com/rust-lang/rust/pull/38327
7196 [38401]: https://github.com/rust-lang/rust/pull/38401
7197 [38413]: https://github.com/rust-lang/rust/pull/38413
7198 [38469]: https://github.com/rust-lang/rust/pull/38469
7199 [38559]: https://github.com/rust-lang/rust/pull/38559
7200 [38571]: https://github.com/rust-lang/rust/pull/38571
7201 [38580]: https://github.com/rust-lang/rust/pull/38580
7202 [38589]: https://github.com/rust-lang/rust/pull/38589
7203 [38670]: https://github.com/rust-lang/rust/pull/38670
7204 [38712]: https://github.com/rust-lang/rust/pull/38712
7205 [38726]: https://github.com/rust-lang/rust/pull/38726
7206 [38781]: https://github.com/rust-lang/rust/pull/38781
7207 [38798]: https://github.com/rust-lang/rust/pull/38798
7208 [38909]: https://github.com/rust-lang/rust/pull/38909
7209 [38920]: https://github.com/rust-lang/rust/pull/38920
7210 [38927]: https://github.com/rust-lang/rust/pull/38927
7211 [39048]: https://github.com/rust-lang/rust/pull/39048
7212 [39282]: https://github.com/rust-lang/rust/pull/39282
7213 [39379]: https://github.com/rust-lang/rust/pull/39379
7214 [41105]: https://github.com/rust-lang/rust/issues/41105
7215 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7216 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7217 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7218 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7219 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7220 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7221 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7222 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7223 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7224 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7225 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7226 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7227 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7228 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7229 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7230 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7231 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7232 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7233 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7234 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7235 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7236 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7237 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7238 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7239 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7240 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7241 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7242 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7243 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7246 Version 1.15.1 (2017-02-09)
7247 ===========================
7249 * [Fix IntoIter::as_mut_slice's signature][39466]
7250 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7252 [39466]: https://github.com/rust-lang/rust/pull/39466
7253 [39523]: https://github.com/rust-lang/rust/pull/39523
7256 Version 1.15.0 (2017-02-02)
7257 ===========================
7262 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7263 stable. This allows popular code-generating crates like Serde and Diesel to
7264 work ergonomically. [RFC 1681].
7265 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7266 with curly braces][36868]. Part of [RFC 1506].
7267 * [A number of minor changes to name resolution have been activated][37127].
7268 They add up to more consistent semantics, allowing for future evolution of
7269 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7270 details of what is different. The breaking changes here have been transitioned
7271 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7272 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7274 * [`?Sized` can be used in `where` clauses][37791]
7275 * [There is now a limit on the size of monomorphized types and it can be
7276 modified with the `#![type_size_limit]` crate attribute, similarly to
7277 the `#![recursion_limit]` attribute][37789]
7282 * [On Windows, the compiler will apply dllimport attributes when linking to
7283 extern functions][37973]. Additional attributes and flags can control which
7284 library kind is linked and its name. [RFC 1717].
7285 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7286 * [The `--test` flag works with procedural macro crates][38107]
7287 * [Fix `extern "aapcs" fn` ABI][37814]
7288 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7289 * [The `format!` expander recognizes incorrect `printf` and shell-style
7290 formatting directives and suggests the correct format][37613].
7291 * [Only report one error for all unused imports in an import list][37456]
7293 Compiler Performance
7294 --------------------
7296 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7297 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7298 * [Don't clone in `UnificationTable::probe`][37848]
7299 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7300 * [Use small vectors in type walker][37760]
7301 * [Macro expansion performance was improved][37701]
7302 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7303 * [Replace FNV with a faster hash function][37229]
7308 * [`std::iter::Iterator::min_by`]
7309 * [`std::iter::Iterator::max_by`]
7310 * [`std::os::*::fs::FileExt`]
7311 * [`std::sync::atomic::Atomic*::get_mut`]
7312 * [`std::sync::atomic::Atomic*::into_inner`]
7313 * [`std::vec::IntoIter::as_slice`]
7314 * [`std::vec::IntoIter::as_mut_slice`]
7315 * [`std::sync::mpsc::Receiver::try_iter`]
7316 * [`std::os::unix::process::CommandExt::before_exec`]
7317 * [`std::rc::Rc::strong_count`]
7318 * [`std::rc::Rc::weak_count`]
7319 * [`std::sync::Arc::strong_count`]
7320 * [`std::sync::Arc::weak_count`]
7321 * [`std::char::encode_utf8`]
7322 * [`std::char::encode_utf16`]
7323 * [`std::cell::Ref::clone`]
7324 * [`std::io::Take::into_inner`]
7329 * [The standard sorting algorithm has been rewritten for dramatic performance
7330 improvements][38192]. It is a hybrid merge sort, drawing influences from
7331 Timsort. Previously it was a naive merge sort.
7332 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7333 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7335 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7336 and `char_indices().last()`][37882]
7337 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7338 * [Chinese characters display correctly in `fmt::Debug`][37855]
7339 * [Derive `Default` for `Duration`][37699]
7340 * [Support creation of anonymous pipes on WinXP/2k][37677]
7341 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7342 * [Don't pass overlapped handles to processes][38835]
7347 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7348 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7349 should instead check the variable at runtime with `std::env`. That the value
7350 was set at build time was a bug, and incorrect when cross-compiling. This
7351 change is known to cause breakage.
7352 * [Add `--all` flag to `cargo test`][cargo/3221]
7353 * [Compile statically against the MSVC CRT][cargo/3363]
7354 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7355 * [Link OpenSSL statically on OSX][cargo/3311]
7356 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7357 * [Test for bad path overrides with summaries][cargo/3336]
7358 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7359 * [Fix retrying crate downloads for network errors][cargo/3348]
7360 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7361 * [Emit more info on --message-format=json][cargo/3319]
7362 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7363 * [Don't ignore errors in workspace manifest][cargo/3409]
7364 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7369 * [Test runners (binaries built with `--test`) now support a `--list` argument
7370 that lists the tests it contains][38185]
7371 * [Test runners now support a `--exact` argument that makes the test filter
7372 match exactly, instead of matching only a substring of the test name][38181]
7373 * [rustdoc supports a `--playground-url` flag][37763]
7374 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7379 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7380 continue to be used in this release by passing `--disable-rustbuild` to the
7381 configure script, but they will be deleted soon. Note that the new build
7382 system uses a different on-disk layout that will likely affect any scripts
7384 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7386 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7387 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7393 * [A number of minor changes to name resolution have been activated][37127].
7394 They add up to more consistent semantics, allowing for future evolution of
7395 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7396 details of what is different. The breaking changes here have been transitioned
7397 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7398 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7399 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7400 should instead check the variable at runtime with `std::env`. That the value
7401 was set at build time was a bug, and incorrect when cross-compiling. This
7402 change is known to cause breakage.
7403 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7404 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7405 1.10 and is now an error by default. It will become a hard error in the near
7407 * [The semantics relating modules to file system directories are changing in
7408 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7409 lint, which is a warning in this release, and will become a hard error in the
7411 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7412 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7413 the underlying iterator][37834]
7415 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7416 [33685]: https://github.com/rust-lang/rust/issues/33685
7417 [36868]: https://github.com/rust-lang/rust/pull/36868
7418 [37127]: https://github.com/rust-lang/rust/pull/37127
7419 [37229]: https://github.com/rust-lang/rust/pull/37229
7420 [37456]: https://github.com/rust-lang/rust/pull/37456
7421 [37527]: https://github.com/rust-lang/rust/pull/37527
7422 [37602]: https://github.com/rust-lang/rust/pull/37602
7423 [37613]: https://github.com/rust-lang/rust/pull/37613
7424 [37615]: https://github.com/rust-lang/rust/pull/37615
7425 [37636]: https://github.com/rust-lang/rust/pull/37636
7426 [37627]: https://github.com/rust-lang/rust/pull/37627
7427 [37642]: https://github.com/rust-lang/rust/pull/37642
7428 [37677]: https://github.com/rust-lang/rust/pull/37677
7429 [37699]: https://github.com/rust-lang/rust/pull/37699
7430 [37701]: https://github.com/rust-lang/rust/pull/37701
7431 [37705]: https://github.com/rust-lang/rust/pull/37705
7432 [37749]: https://github.com/rust-lang/rust/pull/37749
7433 [37760]: https://github.com/rust-lang/rust/pull/37760
7434 [37763]: https://github.com/rust-lang/rust/pull/37763
7435 [37764]: https://github.com/rust-lang/rust/pull/37764
7436 [37789]: https://github.com/rust-lang/rust/pull/37789
7437 [37791]: https://github.com/rust-lang/rust/pull/37791
7438 [37814]: https://github.com/rust-lang/rust/pull/37814
7439 [37817]: https://github.com/rust-lang/rust/pull/37817
7440 [37834]: https://github.com/rust-lang/rust/pull/37834
7441 [37848]: https://github.com/rust-lang/rust/pull/37848
7442 [37855]: https://github.com/rust-lang/rust/pull/37855
7443 [37882]: https://github.com/rust-lang/rust/pull/37882
7444 [37888]: https://github.com/rust-lang/rust/pull/37888
7445 [37973]: https://github.com/rust-lang/rust/pull/37973
7446 [37979]: https://github.com/rust-lang/rust/pull/37979
7447 [38086]: https://github.com/rust-lang/rust/pull/38086
7448 [38107]: https://github.com/rust-lang/rust/pull/38107
7449 [38117]: https://github.com/rust-lang/rust/pull/38117
7450 [38134]: https://github.com/rust-lang/rust/pull/38134
7451 [38146]: https://github.com/rust-lang/rust/pull/38146
7452 [38181]: https://github.com/rust-lang/rust/pull/38181
7453 [38182]: https://github.com/rust-lang/rust/pull/38182
7454 [38185]: https://github.com/rust-lang/rust/pull/38185
7455 [38192]: https://github.com/rust-lang/rust/pull/38192
7456 [38279]: https://github.com/rust-lang/rust/pull/38279
7457 [38835]: https://github.com/rust-lang/rust/pull/38835
7458 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7459 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7460 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7461 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7462 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7463 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7464 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7465 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7466 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7467 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7468 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7469 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7470 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7471 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7472 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7473 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7474 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7475 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7476 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7477 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7478 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7479 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7480 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7481 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7482 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7483 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7484 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7485 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7486 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7487 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7488 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7489 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7490 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7491 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7492 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7493 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7494 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7497 Version 1.14.0 (2016-12-22)
7498 ===========================
7503 * [`..` matches multiple tuple fields in enum variants, structs
7504 and tuples][36843]. [RFC 1492].
7505 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7506 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7507 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7508 dereferencing][36822]
7513 * [Mark enums with non-zero discriminant as non-zero][37224]
7514 * [Lower-case `static mut` names are linted like other
7515 statics and consts][37162]
7516 * [Fix ICE on some macros in const integer positions
7517 (e.g. `[u8; m!()]`)][36819]
7518 * [Improve error message and snippet for "did you mean `x`"][36798]
7519 * [Add a panic-strategy field to the target specification][36794]
7520 * [Include LLVM version in `--version --verbose`][37200]
7522 Compile-time Optimizations
7523 --------------------------
7525 * [Improve macro expansion performance][37569]
7526 * [Shrink `Expr_::ExprInlineAsm`][37445]
7527 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7528 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7529 * [Avoid more allocations when compiling html5ever][37373]
7530 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7531 * [Avoid some allocations in the macro parser][37318]
7532 * [Use a faster deflate setting][37298]
7533 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7534 during interning of slices][37270]
7535 * [Optimize `write_metadata`][37267]
7536 * [Don't process obligation forest cycles when stalled][37231]
7537 * [Avoid many `CrateConfig` clones][37161]
7538 * [Optimize `Substs::super_fold_with`][37108]
7539 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7540 * [Speed up `plug_leaks`][36917]
7545 * [`println!()`, with no arguments, prints newline][36825].
7546 Previously, an empty string was required to achieve the same.
7547 * [`Wrapping` impls standard binary and unary operators, as well as
7548 the `Sum` and `Product` iterators][37356]
7549 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7551 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7552 `VecDeque` iterators][37315]
7553 * [Improve `SipHasher` performance on small values][37312]
7554 * [Add Iterator trait TrustedLen to enable better FromIterator /
7556 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7557 * [`ReadDir` implements `Debug`][37221]
7558 * [Implement `RefUnwindSafe` for atomic types][37178]
7559 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7560 * [Avoid allocations in `Decoder::read_str`][37064]
7561 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7562 * [Impl `Debug` for raw pointers to unsized data][36880]
7563 * [Don't reuse `HashMap` random seeds][37470]
7564 * [The internal memory layout of `HashMap` is more cache-friendly, for
7565 significant improvements in some operations][36692]
7566 * [`HashMap` uses less memory on 32-bit architectures][36595]
7567 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7572 * [Expose rustc cfg values to build scripts][cargo/3243]
7573 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7574 * [Fix passing --features when testing multiple packages][cargo/3280]
7575 * [Use a single profile set per workspace][cargo/3249]
7576 * [Load `replace` sections from lock files][cargo/3220]
7577 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7582 * [rustup is the recommended Rust installation method][1.14rustup]
7583 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7584 S390x. These are [tier 2] platforms and may have major defects. Follow the
7585 instructions on the website to install, or add the targets to an existing
7586 installation with `rustup target add`. The new target triples are:
7587 - `mips-unknown-linux-gnu`
7588 - `mipsel-unknown-linux-gnu`
7589 - `mips64-unknown-linux-gnuabi64`
7590 - `mips64el-unknown-linux-gnuabi64 `
7591 - `powerpc-unknown-linux-gnu`
7592 - `powerpc64-unknown-linux-gnu`
7593 - `powerpc64le-unknown-linux-gnu`
7594 - `s390x-unknown-linux-gnu `
7595 * This release includes target (std) builds for ARM Linux running MUSL
7596 libc. These are [tier 2] platforms and may have major defects. Add the
7597 following triples to an existing rustup installation with `rustup target add`:
7598 - `arm-unknown-linux-musleabi`
7599 - `arm-unknown-linux-musleabihf`
7600 - `armv7-unknown-linux-musleabihf`
7601 * This release includes [experimental support for WebAssembly][1.14wasm], via
7602 the `wasm32-unknown-emscripten` target. This target is known to have major
7603 defects. Please test, report, and fix.
7604 * rustup no longer installs documentation by default. Run `rustup
7605 component add rust-docs` to install.
7606 * [Fix line stepping in debugger][37310]
7607 * [Enable line number debuginfo in releases][37280]
7612 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7613 * [Add support for Fuchsia OS][37313]
7614 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7619 * [A number of forward-compatibility lints used by the compiler
7620 to gradually introduce language changes have been converted
7621 to deny by default][36894]:
7622 - ["use of inaccessible extern crate erroneously allowed"][36886]
7623 - ["type parameter default erroneously allowed in invalid location"][36887]
7624 - ["detects super or self keywords at the beginning of global path"][36888]
7625 - ["two overlapping inherent impls define an item with the same name
7626 were erroneously allowed"][36889]
7627 - ["floating-point constants cannot be used in patterns"][36890]
7628 - ["constants of struct or enum type can only be used in a pattern if
7629 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7630 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7631 * [Prohibit patterns in trait methods without bodies][37378]
7632 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7633 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7634 * [The `$crate` macro variable is accepted in fewer locations][37213]
7635 * [Impls specifying extra region requirements beyond the trait
7636 they implement are rejected][37167]
7637 * [Enums may not be unsized][37111]. Unsized enums are intended to
7638 work but never have. For now they are forbidden.
7639 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7641 [tier 2]: https://forge.rust-lang.org/platform-support.html
7642 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7643 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7644 [36430]: https://github.com/rust-lang/rust/pull/36430
7645 [36595]: https://github.com/rust-lang/rust/pull/36595
7646 [36692]: https://github.com/rust-lang/rust/pull/36692
7647 [36767]: https://github.com/rust-lang/rust/pull/36767
7648 [36794]: https://github.com/rust-lang/rust/pull/36794
7649 [36798]: https://github.com/rust-lang/rust/pull/36798
7650 [36819]: https://github.com/rust-lang/rust/pull/36819
7651 [36822]: https://github.com/rust-lang/rust/pull/36822
7652 [36825]: https://github.com/rust-lang/rust/pull/36825
7653 [36843]: https://github.com/rust-lang/rust/pull/36843
7654 [36880]: https://github.com/rust-lang/rust/pull/36880
7655 [36886]: https://github.com/rust-lang/rust/issues/36886
7656 [36887]: https://github.com/rust-lang/rust/issues/36887
7657 [36888]: https://github.com/rust-lang/rust/issues/36888
7658 [36889]: https://github.com/rust-lang/rust/issues/36889
7659 [36890]: https://github.com/rust-lang/rust/issues/36890
7660 [36891]: https://github.com/rust-lang/rust/issues/36891
7661 [36892]: https://github.com/rust-lang/rust/issues/36892
7662 [36894]: https://github.com/rust-lang/rust/pull/36894
7663 [36917]: https://github.com/rust-lang/rust/pull/36917
7664 [36993]: https://github.com/rust-lang/rust/pull/36993
7665 [37037]: https://github.com/rust-lang/rust/pull/37037
7666 [37064]: https://github.com/rust-lang/rust/pull/37064
7667 [37094]: https://github.com/rust-lang/rust/pull/37094
7668 [37108]: https://github.com/rust-lang/rust/pull/37108
7669 [37111]: https://github.com/rust-lang/rust/pull/37111
7670 [37161]: https://github.com/rust-lang/rust/pull/37161
7671 [37162]: https://github.com/rust-lang/rust/pull/37162
7672 [37167]: https://github.com/rust-lang/rust/pull/37167
7673 [37178]: https://github.com/rust-lang/rust/pull/37178
7674 [37200]: https://github.com/rust-lang/rust/pull/37200
7675 [37213]: https://github.com/rust-lang/rust/pull/37213
7676 [37221]: https://github.com/rust-lang/rust/pull/37221
7677 [37224]: https://github.com/rust-lang/rust/pull/37224
7678 [37230]: https://github.com/rust-lang/rust/pull/37230
7679 [37231]: https://github.com/rust-lang/rust/pull/37231
7680 [37247]: https://github.com/rust-lang/rust/pull/37247
7681 [37267]: https://github.com/rust-lang/rust/pull/37267
7682 [37270]: https://github.com/rust-lang/rust/pull/37270
7683 [37273]: https://github.com/rust-lang/rust/pull/37273
7684 [37280]: https://github.com/rust-lang/rust/pull/37280
7685 [37298]: https://github.com/rust-lang/rust/pull/37298
7686 [37306]: https://github.com/rust-lang/rust/pull/37306
7687 [37310]: https://github.com/rust-lang/rust/pull/37310
7688 [37312]: https://github.com/rust-lang/rust/pull/37312
7689 [37313]: https://github.com/rust-lang/rust/pull/37313
7690 [37315]: https://github.com/rust-lang/rust/pull/37315
7691 [37318]: https://github.com/rust-lang/rust/pull/37318
7692 [37322]: https://github.com/rust-lang/rust/pull/37322
7693 [37326]: https://github.com/rust-lang/rust/pull/37326
7694 [37351]: https://github.com/rust-lang/rust/pull/37351
7695 [37356]: https://github.com/rust-lang/rust/pull/37356
7696 [37367]: https://github.com/rust-lang/rust/pull/37367
7697 [37373]: https://github.com/rust-lang/rust/pull/37373
7698 [37378]: https://github.com/rust-lang/rust/pull/37378
7699 [37389]: https://github.com/rust-lang/rust/pull/37389
7700 [37392]: https://github.com/rust-lang/rust/pull/37392
7701 [37427]: https://github.com/rust-lang/rust/pull/37427
7702 [37439]: https://github.com/rust-lang/rust/pull/37439
7703 [37445]: https://github.com/rust-lang/rust/pull/37445
7704 [37470]: https://github.com/rust-lang/rust/pull/37470
7705 [37569]: https://github.com/rust-lang/rust/pull/37569
7706 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7707 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7708 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7709 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7710 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7711 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7712 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7715 Version 1.13.0 (2016-11-10)
7716 ===========================
7721 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7722 errors, like the `try!` macro, described in [RFC 0243].
7723 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7724 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7725 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7726 * [Fix lifetime rules for 'if' conditions][36029]
7727 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7732 * [Add the `-C link-arg` argument][36574]
7733 * [Remove the old AST-based backend from rustc_trans][35764]
7734 * [Don't enable NEON by default on armv7 Linux][35814]
7735 * [Fix debug line number info for macro expansions][35238]
7736 * [Do not emit "class method" debuginfo for types that are not
7737 DICompositeType][36008]
7738 * [Warn about multiple conflicting #[repr] hints][34623]
7739 * [When sizing DST, don't double-count nested struct prefixes][36351]
7740 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7741 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7742 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7743 * [Expand macros without recursing to avoid stack overflows][36214]
7748 * [Replace macro backtraces with labeled local uses][35702]
7749 * [Improve error message for misplaced doc comments][33922]
7750 * [Buffer unix and lock windows to prevent message interleaving][35975]
7751 * [Update lifetime errors to specifically note temporaries][36171]
7752 * [Special case a few colors for Windows][36178]
7753 * [Suggest `use self` when such an import resolves][36289]
7754 * [Be more specific when type parameter shadows primitive type][36338]
7755 * Many minor improvements
7757 Compile-time Optimizations
7758 --------------------------
7760 * [Compute and cache HIR hashes at beginning][35854]
7761 * [Don't hash types in loan paths][36004]
7762 * [Cache projections in trans][35761]
7763 * [Optimize the parser's last token handling][36527]
7764 * [Only instantiate #[inline] functions in codegen units referencing
7765 them][36524]. This leads to big improvements in cases where crates export
7766 define many inline functions without using them directly.
7767 * [Lazily allocate TypedArena's first chunk][36592]
7768 * [Don't allocate during default HashSet creation][36734]
7775 * [`overflowing_abs`]
7776 * [`RefCell::try_borrow`]
7777 * [`RefCell::try_borrow_mut`]
7782 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7783 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7785 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7786 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7787 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7788 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7789 * [Use arc4rand on FreeBSD][35884]
7790 * [memrchr: Correct aligned offset computation][35969]
7791 * [Improve Demangling of Rust Symbols][36059]
7792 * [Use monotonic time in condition variables][35048]
7793 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7794 * [Implement conversion traits for `char`][35755]
7795 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7796 * [Zero first byte of CString on drop][36264]
7797 * [Inherit overflow checks for sum and product][36372]
7798 * [Add missing Eq implementations][36423]
7799 * [Implement `Debug` for `DirEntry`][36631]
7800 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7802 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7803 * [Implement more traits for `std::io::ErrorKind`][35911]
7804 * [Optimize BinaryHeap bounds checking][36072]
7805 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7806 `extend_with_element`][36355]
7807 * [Fix overflow checking in unsigned pow()][34942]
7812 * This release includes security fixes to both curl and OpenSSL.
7813 * [Fix transitive doctests when panic=abort][cargo/3021]
7814 * [Add --all-features flag to cargo][cargo/3038]
7815 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7816 * [Don't parse the home directory more than once][cargo/3078]
7817 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7818 * [Update OpenSSL to 1.0.2j][cargo/3121]
7819 * [Add license and license_file to cargo metadata output][cargo/3110]
7820 * [Make crates-io registry URL optional in config; ignore all changes to
7821 source.crates-io][cargo/3089]
7822 * [Don't download dependencies from other platforms][cargo/3123]
7823 * [Build transitive dev-dependencies when needed][cargo/3125]
7824 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7825 * [Avoid updating registry when adding existing deps][cargo/3144]
7826 * [Warn about path overrides that won't work][cargo/3136]
7827 * [Use workspaces during `cargo install`][cargo/3146]
7828 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7829 * [Add --message-format flag][cargo/3000]
7830 * [Pass target environment for rustdoc][cargo/3205]
7831 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7832 * [Update curl and curl-sys][cargo/3241]
7833 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7838 * [rustdoc: Add the `--sysroot` argument][36586]
7839 * [rustdoc: Fix a couple of issues with the search results][35655]
7840 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7841 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7842 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7847 * [Remove unmaintained style guide][35124]
7848 * [Add s390x support][36369]
7849 * [Initial work at Haiku OS support][36727]
7850 * [Add mips-uclibc targets][35734]
7851 * [Crate-ify compiler-rt into compiler-builtins][35021]
7852 * [Add rustc version info (git hash + date) to dist tarball][36213]
7853 * Many documentation improvements
7858 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7859 * [Deny (by default) transmuting from fn item types to pointer-sized
7860 types][34923]. Continuing the long transition to zero-sized fn items,
7862 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7864 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7865 * [Fix lifetime rules for 'if' conditions][36029].
7866 * [Inherit overflow checks for sum and product][36372].
7867 * [Forbid user-defined macros named "macro_rules"][36730].
7869 [33922]: https://github.com/rust-lang/rust/pull/33922
7870 [34623]: https://github.com/rust-lang/rust/pull/34623
7871 [34923]: https://github.com/rust-lang/rust/pull/34923
7872 [34942]: https://github.com/rust-lang/rust/pull/34942
7873 [35021]: https://github.com/rust-lang/rust/pull/35021
7874 [35048]: https://github.com/rust-lang/rust/pull/35048
7875 [35074]: https://github.com/rust-lang/rust/pull/35074
7876 [35124]: https://github.com/rust-lang/rust/pull/35124
7877 [35234]: https://github.com/rust-lang/rust/pull/35234
7878 [35238]: https://github.com/rust-lang/rust/pull/35238
7879 [35354]: https://github.com/rust-lang/rust/pull/35354
7880 [35559]: https://github.com/rust-lang/rust/pull/35559
7881 [35585]: https://github.com/rust-lang/rust/pull/35585
7882 [35627]: https://github.com/rust-lang/rust/pull/35627
7883 [35655]: https://github.com/rust-lang/rust/pull/35655
7884 [35702]: https://github.com/rust-lang/rust/pull/35702
7885 [35707]: https://github.com/rust-lang/rust/pull/35707
7886 [35728]: https://github.com/rust-lang/rust/pull/35728
7887 [35734]: https://github.com/rust-lang/rust/pull/35734
7888 [35755]: https://github.com/rust-lang/rust/pull/35755
7889 [35761]: https://github.com/rust-lang/rust/pull/35761
7890 [35764]: https://github.com/rust-lang/rust/pull/35764
7891 [35814]: https://github.com/rust-lang/rust/pull/35814
7892 [35854]: https://github.com/rust-lang/rust/pull/35854
7893 [35871]: https://github.com/rust-lang/rust/pull/35871
7894 [35884]: https://github.com/rust-lang/rust/pull/35884
7895 [35911]: https://github.com/rust-lang/rust/pull/35911
7896 [35969]: https://github.com/rust-lang/rust/pull/35969
7897 [35975]: https://github.com/rust-lang/rust/pull/35975
7898 [36004]: https://github.com/rust-lang/rust/pull/36004
7899 [36008]: https://github.com/rust-lang/rust/pull/36008
7900 [36014]: https://github.com/rust-lang/rust/pull/36014
7901 [36029]: https://github.com/rust-lang/rust/pull/36029
7902 [36059]: https://github.com/rust-lang/rust/pull/36059
7903 [36072]: https://github.com/rust-lang/rust/pull/36072
7904 [36101]: https://github.com/rust-lang/rust/pull/36101
7905 [36104]: https://github.com/rust-lang/rust/pull/36104
7906 [36171]: https://github.com/rust-lang/rust/pull/36171
7907 [36173]: https://github.com/rust-lang/rust/pull/36173
7908 [36178]: https://github.com/rust-lang/rust/pull/36178
7909 [36213]: https://github.com/rust-lang/rust/pull/36213
7910 [36214]: https://github.com/rust-lang/rust/pull/36214
7911 [36264]: https://github.com/rust-lang/rust/pull/36264
7912 [36266]: https://github.com/rust-lang/rust/pull/36266
7913 [36289]: https://github.com/rust-lang/rust/pull/36289
7914 [36338]: https://github.com/rust-lang/rust/pull/36338
7915 [36351]: https://github.com/rust-lang/rust/pull/36351
7916 [36355]: https://github.com/rust-lang/rust/pull/36355
7917 [36369]: https://github.com/rust-lang/rust/pull/36369
7918 [36372]: https://github.com/rust-lang/rust/pull/36372
7919 [36423]: https://github.com/rust-lang/rust/pull/36423
7920 [36482]: https://github.com/rust-lang/rust/pull/36482
7921 [36505]: https://github.com/rust-lang/rust/pull/36505
7922 [36524]: https://github.com/rust-lang/rust/pull/36524
7923 [36527]: https://github.com/rust-lang/rust/pull/36527
7924 [36551]: https://github.com/rust-lang/rust/pull/36551
7925 [36574]: https://github.com/rust-lang/rust/pull/36574
7926 [36586]: https://github.com/rust-lang/rust/pull/36586
7927 [36592]: https://github.com/rust-lang/rust/pull/36592
7928 [36631]: https://github.com/rust-lang/rust/pull/36631
7929 [36721]: https://github.com/rust-lang/rust/pull/36721
7930 [36727]: https://github.com/rust-lang/rust/pull/36727
7931 [36730]: https://github.com/rust-lang/rust/pull/36730
7932 [36734]: https://github.com/rust-lang/rust/pull/36734
7933 [36754]: https://github.com/rust-lang/rust/pull/36754
7934 [36995]: https://github.com/rust-lang/rust/pull/36995
7935 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7936 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7937 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7938 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7939 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7940 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7941 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7942 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7943 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7944 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7945 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7946 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7947 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7948 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7949 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7950 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7951 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7952 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7953 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7954 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7955 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7956 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7957 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7958 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7959 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7960 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7961 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7962 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7963 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7964 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7965 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7966 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7969 Version 1.12.1 (2016-10-20)
7970 ===========================
7975 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7976 * [Confusion with double negation and booleans][36856]
7977 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7978 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7979 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7980 * [Corrupted memory after updated to 1.12][36936]
7981 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7982 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7983 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7985 [36381]: https://github.com/rust-lang/rust/issues/36381
7986 [36856]: https://github.com/rust-lang/rust/issues/36856
7987 [36875]: https://github.com/rust-lang/rust/issues/36875
7988 [36924]: https://github.com/rust-lang/rust/issues/36924
7989 [36926]: https://github.com/rust-lang/rust/issues/36926
7990 [36936]: https://github.com/rust-lang/rust/issues/36936
7991 [37026]: https://github.com/rust-lang/rust/issues/37026
7992 [37112]: https://github.com/rust-lang/rust/issues/37112
7993 [37153]: https://github.com/rust-lang/rust/issues/37153
7996 Version 1.12.0 (2016-09-29)
7997 ===========================
8002 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8003 This translation pass is far simpler than the previous AST->LLVM pass, and
8004 creates opportunities to perform new optimizations directly on the MIR. It
8005 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8006 * [`rustc` presents a new, more readable error format, along with
8007 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8008 Most common editors supporting Rust have been updated to work with it. It was
8009 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8014 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8015 This translation pass is far simpler than the previous AST->LLVM pass, and
8016 creates opportunities to perform new optimizations directly on the MIR. It
8017 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8018 * [Print the Rust target name, not the LLVM target name, with
8019 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8020 * [The computation of `TypeId` is correct in some cases where it was previously
8021 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8022 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8023 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8024 `--print relocation-models`, and `--print code-models` print the available
8025 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8026 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8027 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8028 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8029 These targets produce statically-linked binaries. There are no binary release
8035 * [`rustc` presents a new, more readable error format, along with
8036 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8037 Most common editors supporting Rust have been updated to work with it. It was
8038 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8039 * [In error descriptions, references are now described in plain English,
8040 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8041 * [In error type descriptions, unknown numeric types are named `{integer}` or
8042 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8043 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8048 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8049 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8050 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8051 useful](https://github.com/rust-lang/rust/pull/34908)
8052 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8053 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8054 * [Semicolons are properly required as statement delimiters inside
8055 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8056 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8061 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8062 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8063 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8064 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8065 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8066 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8067 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8068 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8069 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8070 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8071 Both on Unix and Windows.
8072 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8073 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8074 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8075 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8076 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8077 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8078 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8079 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8084 * [The `format!` macro and friends now allow a single argument to be formatted
8085 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8086 * [The lifetime bounds on `[T]::binary_search_by` and
8087 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8088 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8089 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8090 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8091 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8092 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8093 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8094 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8095 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8096 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8097 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8098 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8099 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8100 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8101 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8102 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8103 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8104 * [`mpsc::sync_channel` `Receiver`s return any available message before
8105 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8106 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8107 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8112 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8113 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8114 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8115 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8116 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8117 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8118 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8119 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8120 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8121 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8122 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8123 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8124 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8125 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8126 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8127 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8132 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8133 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8138 * [Test binaries now support a `--test-threads` argument to specify the number
8139 of threads used to run tests, and which acts the same as the
8140 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8141 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8142 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8143 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8144 * [Rust releases now come with source packages that can be installed by rustup
8145 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8146 The resulting source code can be used by tools and IDES, located in the
8147 sysroot under `lib/rustlib/src`.
8152 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8153 * Many minor improvements to the documentation.
8154 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8159 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8160 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8161 * [When formatting strings, if "precision" is specified, the "fill",
8162 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8163 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8166 Version 1.11.0 (2016-08-18)
8167 ===========================
8172 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8173 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8174 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8175 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8180 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8181 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8182 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8183 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8184 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8185 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8186 (in libcore - previously stabilized in libstd)
8187 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8188 (in libcore - previously stabilized in libstd)
8189 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8190 (in libcore - previously stabilized in libstd)
8191 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8192 (in libcore - previously stabilized in libstd)
8193 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8194 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8195 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8196 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8201 * [The `thread_local!` macro supports multiple definitions in a single
8202 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8203 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8204 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8205 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8206 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8207 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8208 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8209 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8214 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8215 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8216 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8217 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8218 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8219 and `-vv` prints warnings for all crates.
8220 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8221 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8222 This provides room for expansion by arbitrary tools.
8223 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8224 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8225 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8226 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8227 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8228 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8229 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8234 * [Caching projections speeds up type check dramatically for some
8235 workloads](https://github.com/rust-lang/rust/pull/33816)
8236 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8237 This hasher is faster, but is believed to provide sufficient
8238 protection from collision attacks.
8239 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8244 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8245 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8246 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8247 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8248 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8253 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8254 * [When emitting debug info, rustc emits frame pointers for closures,
8255 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8256 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8257 * Many more errors have been given error codes and extended
8259 * API documentation continues to be improved, with many new examples
8264 * [rustc no longer hangs when dependencies recursively re-export
8265 submodules](https://github.com/rust-lang/rust/pull/34542)
8266 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8267 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8268 rewritten](https://github.com/rust-lang/rust/pull/33895)
8269 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8270 No targets use this yet, but it works toward AVR support.
8275 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8276 * [The new follow-set rules that place restrictions on `macro_rules!`
8277 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8278 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8279 and has been a warning since 1.10.
8280 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8281 This causes breakage in some corner cases.
8284 Version 1.10.0 (2016-07-07)
8285 ===========================
8290 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8291 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8292 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8293 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8294 * [`panic!` can be converted to a runtime abort with the
8295 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8296 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8297 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8298 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8299 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8300 Note that Cargo does not yet directly support cdylibs.
8305 * `os::windows::fs::OpenOptionsExt::access_mode`
8306 * `os::windows::fs::OpenOptionsExt::share_mode`
8307 * `os::windows::fs::OpenOptionsExt::custom_flags`
8308 * `os::windows::fs::OpenOptionsExt::attributes`
8309 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8310 * `os::unix::fs::OpenOptionsExt::custom_flags`
8311 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8312 * `Default for sync::Weak`
8313 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8314 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8315 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8316 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8317 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8318 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8319 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8320 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8321 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8322 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8323 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8324 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8325 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8326 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8327 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8328 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8329 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8330 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8331 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8332 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8333 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8334 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8335 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8336 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8337 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8338 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8339 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8340 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8341 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8342 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8343 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8344 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8345 * Read/Write/RawFd impls for `UnixStream`
8346 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8347 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8348 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8349 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8350 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8351 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8352 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8353 * RawFd impls for `UnixListener`
8354 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8355 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8356 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8357 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8358 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8359 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8360 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8361 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8362 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8363 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8364 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8365 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8366 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8367 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8368 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8369 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8370 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8371 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8372 * RawFd impls for `UnixDatagram`
8373 * `{BTree,Hash}Map::values_mut`
8374 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8379 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8380 The semantics of this minor method are subtle and probably not what
8382 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8383 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8384 will fall back to `/dev/urandom` temporarily to avoid blocking
8385 during early boot](https://github.com/rust-lang/rust/pull/33086).
8386 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8387 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8388 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8389 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8390 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8391 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8392 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8396 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8397 This controls the runtime behavior of the `panic!` macro
8398 and can be either "unwind" (the default), or "abort".
8399 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8400 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8401 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8402 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8403 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8404 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8405 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8406 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8407 By default they are retried twice, which can be customized with the
8408 `net.retry` value in `.cargo/config`.
8409 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8410 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8411 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8412 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8413 Makes it possible to install multiple crates in parallel.
8414 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8415 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8416 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8417 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8418 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8419 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8424 * [rustc memory usage was reduced by refactoring the context used for
8425 type checking](https://github.com/rust-lang/rust/pull/33425).
8426 * [Speed up creation of `HashMap`s by caching the random keys used
8427 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8428 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8429 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8430 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8431 10x faster than the previous lookup tables.
8432 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8437 * Many incremental improvements to documentation and rustdoc.
8438 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8439 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8440 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8441 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8442 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8443 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8444 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8449 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8450 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8451 * [`std` no longer prints backtraces on platforms where the running
8452 module must be loaded with `env::current_exe`, which can't be relied
8453 on](https://github.com/rust-lang/rust/pull/33554).
8454 * This release includes std binaries for the i586-unknown-linux-gnu,
8455 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8456 i586 target is for old x86 hardware without SSE2, and the armv7
8457 target is for Android running on modern ARM architectures.
8458 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8459 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8460 * [On Unix the runtime aborts by calling `libc::abort` instead of
8461 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8462 * [Rust is now bootstrapped from the previous release of Rust,
8463 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8468 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8469 * [`target_env` for Linux ARM targets is just `gnu`, not
8470 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8471 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8472 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8473 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8474 Affects how macros are parsed.
8475 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8476 * [Feature-gated attributes on macro-generated macro invocations are
8477 now rejected](https://github.com/rust-lang/rust/pull/32791).
8478 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8479 This caused some minor changes to type inference.
8482 Version 1.9.0 (2016-05-26)
8483 ==========================
8488 * The `#[deprecated]` attribute when applied to an API will generate
8489 warnings when used. The warnings may be suppressed with
8490 `#[allow(deprecated)]`. [RFC 1270].
8491 * [`fn` item types are zero sized, and each `fn` names a unique
8492 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8493 `transmute` on a `fn` type will generate a warning for a few cycles,
8494 then will be converted to an error.
8495 * [Field and method resolution understand visibility, so private
8496 fields and methods cannot prevent the proper use of public fields
8497 and methods][1.9fv].
8498 * [The parser considers unicode codepoints in the
8499 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8505 * [`std::panic::catch_unwind`] (renamed from `recover`)
8506 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8507 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8508 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8509 * [`str::is_char_boundary`]
8510 * [`<*const T>::as_ref`]
8511 * [`<*mut T>::as_ref`]
8512 * [`<*mut T>::as_mut`]
8513 * [`AsciiExt::make_ascii_uppercase`]
8514 * [`AsciiExt::make_ascii_lowercase`]
8515 * [`char::decode_utf16`]
8516 * [`char::DecodeUtf16`]
8517 * [`char::DecodeUtf16Error`]
8518 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8519 * [`BTreeSet::take`]
8520 * [`BTreeSet::replace`]
8523 * [`HashSet::replace`]
8525 * [`OsString::with_capacity`]
8526 * [`OsString::clear`]
8527 * [`OsString::capacity`]
8528 * [`OsString::reserve`]
8529 * [`OsString::reserve_exact`]
8530 * [`OsStr::is_empty`]
8532 * [`std::os::unix::thread`]
8535 * [`JoinHandleExt::as_pthread_t`]
8536 * [`JoinHandleExt::into_pthread_t`]
8537 * [`HashSet::hasher`]
8538 * [`HashMap::hasher`]
8539 * [`CommandExt::exec`]
8540 * [`File::try_clone`]
8541 * [`SocketAddr::set_ip`]
8542 * [`SocketAddr::set_port`]
8543 * [`SocketAddrV4::set_ip`]
8544 * [`SocketAddrV4::set_port`]
8545 * [`SocketAddrV6::set_ip`]
8546 * [`SocketAddrV6::set_port`]
8547 * [`SocketAddrV6::set_flowinfo`]
8548 * [`SocketAddrV6::set_scope_id`]
8549 * [`slice::copy_from_slice`]
8550 * [`ptr::read_volatile`]
8551 * [`ptr::write_volatile`]
8552 * [`OpenOptions::create_new`]
8553 * [`TcpStream::set_nodelay`]
8554 * [`TcpStream::nodelay`]
8555 * [`TcpStream::set_ttl`]
8556 * [`TcpStream::ttl`]
8557 * [`TcpStream::set_only_v6`]
8558 * [`TcpStream::only_v6`]
8559 * [`TcpStream::take_error`]
8560 * [`TcpStream::set_nonblocking`]
8561 * [`TcpListener::set_ttl`]
8562 * [`TcpListener::ttl`]
8563 * [`TcpListener::set_only_v6`]
8564 * [`TcpListener::only_v6`]
8565 * [`TcpListener::take_error`]
8566 * [`TcpListener::set_nonblocking`]
8567 * [`UdpSocket::set_broadcast`]
8568 * [`UdpSocket::broadcast`]
8569 * [`UdpSocket::set_multicast_loop_v4`]
8570 * [`UdpSocket::multicast_loop_v4`]
8571 * [`UdpSocket::set_multicast_ttl_v4`]
8572 * [`UdpSocket::multicast_ttl_v4`]
8573 * [`UdpSocket::set_multicast_loop_v6`]
8574 * [`UdpSocket::multicast_loop_v6`]
8575 * [`UdpSocket::set_multicast_ttl_v6`]
8576 * [`UdpSocket::multicast_ttl_v6`]
8577 * [`UdpSocket::set_ttl`]
8578 * [`UdpSocket::ttl`]
8579 * [`UdpSocket::set_only_v6`]
8580 * [`UdpSocket::only_v6`]
8581 * [`UdpSocket::join_multicast_v4`]
8582 * [`UdpSocket::join_multicast_v6`]
8583 * [`UdpSocket::leave_multicast_v4`]
8584 * [`UdpSocket::leave_multicast_v6`]
8585 * [`UdpSocket::take_error`]
8586 * [`UdpSocket::connect`]
8587 * [`UdpSocket::send`]
8588 * [`UdpSocket::recv`]
8589 * [`UdpSocket::set_nonblocking`]
8594 * [`std::sync::Once` is poisoned if its initialization function
8596 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8597 * [Most types implement `fmt::Debug`][1.9db].
8598 * [The default buffer size used by `BufReader` and `BufWriter` was
8599 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8600 used by other languages.
8601 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8602 `Duration` additionally implements `*=` and `/=`][1.9ta].
8603 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8604 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8605 * [`Chain` implements `BufRead`][1.9ch].
8606 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8611 * [Cargo can now run concurrently][1.9cc].
8612 * [Top-level overrides allow specific revisions of crates to be
8613 overridden through the entire crate graph][1.9ct]. This is intended
8614 to make upgrades easier for large projects, by allowing crates to be
8615 forked temporarily until they've been upgraded and republished.
8616 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8617 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8618 on the commandline][1.9cf]. `rustc` arguments can also be specified
8619 in the `build.rustflags` configuration key.
8624 * [The time complexity of comparing variables for equivalence during type
8625 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8626 to major compilation time improvement in some scenarios.
8627 * [`ToString` is specialized for `str`, giving it the same performance
8628 as `to_owned`][1.9ts].
8629 * [Spawning processes with `Command::output` no longer creates extra
8631 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8632 for C-like enums][1.9cl].
8637 * [Passing the `--quiet` flag to a test runner will produce
8638 much-abbreviated output][1.9q].
8639 * The Rust Project now publishes std binaries for the
8640 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8641 `i586-pc-windows-msvc` targets.
8646 * [`std::sync::Once` is poisoned if its initialization function
8648 * [It is illegal to define methods with the same name in overlapping
8649 inherent `impl` blocks][1.9sn].
8650 * [`fn` item types are zero sized, and each `fn` names a unique
8651 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8652 `transmute` on a `fn` type will generate a warning for a few cycles,
8653 then will be converted to an error.
8654 * [Improvements to const evaluation may trigger new errors when integer
8655 literals are out of range][1.9ce].
8658 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8659 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8660 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8661 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8662 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8663 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8664 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8665 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8666 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8667 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8668 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8669 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8670 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8671 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8672 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8673 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8674 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8675 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8676 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8677 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8678 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8679 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8680 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8681 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8682 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8683 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8684 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8685 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8686 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8687 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8688 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8689 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8690 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8691 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8692 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8693 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8694 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8695 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8696 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8697 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8698 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8699 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8700 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8701 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8702 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8703 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8704 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8705 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8706 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8707 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8708 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8709 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8710 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8711 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8712 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8713 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8714 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8715 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8716 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8717 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8718 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8719 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8720 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8721 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8722 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8723 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8724 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8725 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8726 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8727 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8728 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8729 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8730 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8731 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8732 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8733 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8734 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8735 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8736 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8737 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8738 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8739 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8740 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8741 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8742 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8743 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8744 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8745 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8746 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8747 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8748 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8749 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8750 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8751 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8752 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8753 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8754 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8755 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8756 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8757 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8758 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8759 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8760 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8761 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8762 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8763 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8764 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8765 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8766 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8767 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8770 Version 1.8.0 (2016-04-14)
8771 ==========================
8776 * Rust supports overloading of compound assignment statements like
8777 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8778 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8779 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8781 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8782 addition to the non-braced form, `struct Foo;`. [RFC 218].
8788 * [`str::encode_utf16`] (renamed from `utf16_units`)
8789 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8792 * [`ptr::drop_in_place`]
8794 * [`time::SystemTime`]
8796 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8797 * [`Instant::elapsed`]
8798 * [`SystemTime::now`]
8799 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8800 * [`SystemTime::elapsed`]
8801 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8802 * [`SystemTimeError`]
8803 * [`SystemTimeError::duration`]
8804 * Various impls for `SystemTimeError`
8806 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8807 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8808 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8809 * [The `write!` and `writeln!` macros correctly emit errors if any of
8810 their arguments can't be formatted][1.8w].
8811 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8812 * [The Unix-specific `raw` modules, which contain a number of
8813 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8814 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8815 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8816 across platforms was making it difficult to implement `std`
8817 correctly. Those that need these definitions should use the `libc`
8819 * The Unix-specific `MetadataExt` traits, including
8820 `os::unix::fs::MetadataExt`, which expose values such as inode
8821 numbers [no longer return platform-specific types][1.8r], but
8822 instead return widened integers. [RFC 1415].
8823 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8824 * [Atomic loads and stores are not volatile][1.8a].
8825 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8830 * [Inlining hash functions lead to a 3% compile-time improvement in
8831 some workloads][1.8h].
8832 * When using jemalloc, its symbols are [unprefixed so that it
8833 overrides the libc malloc implementation][1.8h]. This means that for
8834 rustc, LLVM is now using jemalloc, which results in a 6%
8835 compile-time improvement on a specific workload.
8836 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8841 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8842 i686-pc-windows-msvc is now considered a tier-1 platform.
8843 * [The `--print targets` flag prints a list of supported targets][1.8t].
8844 * [The `--print cfg` flag prints the `cfg`s defined for the current
8846 * [`rustc` can be built with an new Cargo-based build system, written
8847 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8848 build system. To enable it configure with `configure --rustbuild`.
8849 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8850 variants while also indicating the total number of missing variants
8851 if more than 3][1.8m].
8852 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8853 * The Rust Project now publishes binary releases of the standard
8854 library for a number of tier-2 targets:
8855 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8856 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8857 `x86_64-rumprun-netbsd`. These can be installed with
8858 tools such as [multirust][1.8mr].
8863 * [`cargo init` creates a new Cargo project in the current
8864 directory][1.8ci]. It is otherwise like `cargo new`.
8865 * [Cargo has configuration keys for `-v` and
8866 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8867 `[term]` section of `.cargo/config`.
8868 * [Configuration keys that evaluate to strings or integers can be set
8869 via environment variables][1.8ce]. For example the `build.jobs` key
8870 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8871 precedence over config files.
8872 * [Target-specific dependencies support Rust `cfg` syntax for
8873 describing targets][1.8cfg] so that dependencies for multiple
8874 targets can be specified together. [RFC 1361].
8875 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8876 `RUSTDOC` take precedence over the `build.target-dir`,
8877 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8878 * [The child process tree is killed on Windows when Cargo is
8880 * [The `build.target` configuration value sets the target platform,
8881 like `--target`][1.8ct].
8886 * [Unstable compiler flags have been further restricted][1.8u]. Since
8887 1.0 `-Z` flags have been considered unstable, and other flags that
8888 were considered unstable additionally required passing `-Z
8889 unstable-options` to access. Unlike unstable language and library
8890 features though, these options have been accessible on the stable
8891 release channel. Going forward, *new unstable flags will not be
8892 available on the stable release channel*, and old unstable flags
8893 will warn about their usage. In the future, all unstable flags will
8894 be unavailable on the stable release channel.
8895 * [It is no longer possible to `match` on empty enum variants using
8896 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8897 * The Unix-specific `MetadataExt` traits, including
8898 `os::unix::fs::MetadataExt`, which expose values such as inode
8899 numbers [no longer return platform-specific types][1.8r], but
8900 instead return widened integers. [RFC 1415].
8901 * [Modules sourced from the filesystem cannot appear within arbitrary
8902 blocks, but only within other modules][1.8mf].
8903 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8904 * On Unix, [stack overflow triggers a runtime abort instead of a
8906 * [`Command::spawn` and its equivalents return an error if any of
8907 its command-line arguments contain interior `NUL`s][1.8n].
8908 * [Tuple and unit enum variants from other crates are in the type
8910 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8911 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8912 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8913 instead of `foo.lib`.
8916 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8917 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8918 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8919 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8920 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8921 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8922 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8923 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8924 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8925 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8926 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8927 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8928 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8929 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8930 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8931 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8932 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8933 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8934 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8935 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8936 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8937 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8938 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8939 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8940 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8941 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8942 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8943 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8944 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8945 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8946 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8947 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8948 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8949 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8950 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8951 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8952 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8953 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8954 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8955 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8956 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8957 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8958 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8959 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8960 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8961 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8962 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8963 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8964 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8965 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8966 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8967 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8968 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8969 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8970 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8971 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8972 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8973 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8974 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8975 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8978 Version 1.7.0 (2016-03-03)
8979 ==========================
8986 * [`Path::strip_prefix`] (renamed from relative_from)
8987 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8989 * [`Ipv4Addr::is_loopback`]
8990 * [`Ipv4Addr::is_private`]
8991 * [`Ipv4Addr::is_link_local`]
8992 * [`Ipv4Addr::is_multicast`]
8993 * [`Ipv4Addr::is_broadcast`]
8994 * [`Ipv4Addr::is_documentation`]
8996 * [`Ipv6Addr::is_unspecified`]
8997 * [`Ipv6Addr::is_loopback`]
8998 * [`Ipv6Addr::is_multicast`]
9001 * [`Vec::as_mut_slice`]
9003 * [`String::as_str`]
9004 * [`String::as_mut_str`]
9006 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9008 * `<[T]>::`[`sort_by_key`]
9009 * checked, saturated, and overflowing operations
9010 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9011 * [`i32::saturating_mul`]
9012 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9013 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9014 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9015 * [`u32::saturating_mul`]
9016 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9017 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9018 * and checked, saturated, and overflowing operations for other primitive types
9020 * [`ffi::IntoStringError`]
9021 * [`CString::into_string`]
9022 * [`CString::into_bytes`]
9023 * [`CString::into_bytes_with_nul`]
9024 * `From<CString> for Vec<u8>`
9026 * [`IntoStringError::into_cstring`]
9027 * [`IntoStringError::utf8_error`]
9028 * `Error for IntoStringError`
9030 * [`std::hash::BuildHasher`]
9031 * [`BuildHasher::Hasher`]
9032 * [`BuildHasher::build_hasher`]
9033 * [`std::hash::BuildHasherDefault`]
9034 * [`HashMap::with_hasher`]
9035 * [`HashMap::with_capacity_and_hasher`]
9036 * [`HashSet::with_hasher`]
9037 * [`HashSet::with_capacity_and_hasher`]
9038 * [`std::collections::hash_map::RandomState`]
9039 * [`RandomState::new`]
9040 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9041 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9042 from bytes is faster.
9043 * [The performance of `LineWriter` (and thus `io::stdout`) was
9044 improved by using `memchr` to search for newlines][1.7m].
9045 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9046 `f64` variants were stabilized previously.
9047 * [`BTreeMap` was rewritten to use less memory and improve the performance
9048 of insertion and iteration, the latter by as much as 5x][1.7bm].
9049 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9050 covariant over their contained type][1.7bt].
9051 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9052 over their contained type][1.7ll].
9053 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9055 * [`Any` is implemented for unsized types][1.7a].
9056 * [`Hash` is implemented for `Duration`][1.7h].
9061 * [When running tests with `--test`, rustdoc will pass `--cfg`
9062 arguments to the compiler][1.7dt].
9063 * [The compiler is built with RPATH information by default][1.7rpa].
9064 This means that it will be possible to run `rustc` when installed in
9065 unusual configurations without configuring the dynamic linker search
9067 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9068 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9069 over `LD_LIBRARY_PATH`.
9074 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9075 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9076 * [The `rerun-if-changed` build script directive no longer causes the
9077 build script to incorrectly run twice in certain scenarios][1.7rr].
9082 * Soundness fixes to the interactions between associated types and
9083 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9084 code that violates the new rules. This is a significant change that
9085 is known to break existing code, so it has emitted warnings for the
9086 new error cases since 1.4 to give crate authors time to adapt. The
9087 details of what is changing are subtle; read the RFC for more.
9088 * [Several bugs in the compiler's visibility calculations were
9089 fixed][1.7v]. Since this was found to break significant amounts of
9090 code, the new errors will be emitted as warnings for several release
9091 cycles, under the `private_in_public` lint.
9092 * Defaulted type parameters were accidentally accepted in positions
9093 that were not intended. In this release, [defaulted type parameters
9094 appearing outside of type definitions will generate a
9095 warning][1.7d], which will become an error in future releases.
9096 * [Parsing "." as a float results in an error instead of 0][1.7p].
9097 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9098 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9100 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9101 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9102 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9103 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9104 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9105 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9106 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9107 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9108 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9109 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9110 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9111 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9112 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9113 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9114 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9115 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9116 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9117 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9118 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9119 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9120 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9121 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9122 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9123 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9124 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9125 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9126 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9127 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9128 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9129 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9130 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9131 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9132 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9133 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9134 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9135 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9136 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9137 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9138 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9139 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9140 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9141 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9142 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9143 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9144 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9145 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9146 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9147 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9148 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9149 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9150 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9151 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9152 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9153 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9154 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9155 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9156 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9157 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9158 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9159 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9160 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9161 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9162 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9163 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9164 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9165 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9166 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9167 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9168 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9169 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9170 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9171 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9172 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9173 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9174 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9175 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9176 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9177 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9178 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9181 Version 1.6.0 (2016-01-21)
9182 ==========================
9187 * The `#![no_std]` attribute causes a crate to not be linked to the
9188 standard library, but only the [core library][1.6co], as described
9189 in [RFC 1184]. The core library defines common types and traits but
9190 has no platform dependencies whatsoever, and is the basis for Rust
9191 software in environments that cannot support a full port of the
9192 standard library, such as operating systems. Most of the core
9193 library is now stable.
9199 [`Read::read_exact`],
9200 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9201 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9202 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9203 [`os::unix::fs::DirBuilderExt`],
9204 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9205 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9206 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9207 [`collections::hash_map::Drain`],
9208 [`collections::hash_map::HashMap::drain`],
9209 [`collections::hash_set::Drain`],
9210 [`collections::hash_set::HashSet::drain`],
9211 [`collections::binary_heap::Drain`],
9212 [`collections::binary_heap::BinaryHeap::drain`],
9213 [`Vec::extend_from_slice`] (renamed from `push_all`),
9214 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9215 [`RwLock::into_inner`],
9216 [`Iterator::min_by_key`] (renamed from `min_by`),
9217 [`Iterator::max_by_key`] (renamed from `max_by`).
9218 * The [core library][1.6co] is stable, as are most of its APIs.
9219 * [The `assert_eq!` macro supports arguments that don't implement
9220 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9222 * Several timer functions that take duration in milliseconds [are
9223 deprecated in favor of those that take `Duration`][1.6ms]. These
9224 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9225 `thread::park_timeout_ms`.
9226 * The algorithm by which `Vec` reserves additional elements was
9227 [tweaked to not allocate excessive space][1.6a] while still growing
9229 * `From` conversions are [implemented from integers to floats][1.6f]
9230 in cases where the conversion is lossless. Thus they are not
9231 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9232 or `f64`. They are also not implemented for `isize` and `usize`
9233 because the implementations would be platform-specific. `From` is
9234 also implemented from `f32` to `f64`.
9235 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9236 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9237 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9238 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9240 * Sorting slices that are already sorted [is 50% faster in some
9246 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9247 * Cargo build scripts can specify their dependencies by emitting the
9248 [`rerun-if-changed`][1.6rr] key.
9249 * crates.io will reject publication of crates with dependencies that
9250 have a wildcard version constraint. Crates with wildcard
9251 dependencies were seen to cause a variety of problems, as described
9252 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9254 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9255 release folder. A variety of artifacts that Cargo failed to clean
9256 are now correctly deleted.
9261 * The `unreachable_code` lint [warns when a function call's argument
9263 * The parser indicates [failures that may be caused by
9264 confusingly-similar Unicode characters][1.6uc]
9265 * Certain macro errors [are reported at definition time][1.6m], not
9271 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9272 environment variable when locating crates. This was a pre-cargo
9273 feature for integrating with the package manager that was
9274 accidentally never removed.
9275 * [A number of bugs were fixed in the privacy checker][1.6p] that
9276 could cause previously-accepted code to break.
9277 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9278 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9279 struct pattern syntax (`Foo(..)`) can no longer be used to match
9280 unit structs. This is a warning now, but will become an error in
9281 future releases. Patterns that share the same name as a const are
9283 * A bug was fixed that causes [rustc not to apply default type
9284 parameters][1.6xc] when resolving certain method implementations of
9285 traits defined in other crates.
9287 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9288 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9289 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9290 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9291 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9292 [1.6co]: http://doc.rust-lang.org/core/index.html
9293 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9294 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9295 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9296 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9297 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9298 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9299 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9300 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9301 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9302 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9303 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9304 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9305 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9306 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9307 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9308 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9309 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9310 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9311 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9312 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9313 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9314 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9315 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9316 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9317 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9318 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9319 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9320 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9321 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9322 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9323 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9324 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9325 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9326 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9327 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9328 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9329 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9330 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9331 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9332 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9333 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9336 Version 1.5.0 (2015-12-10)
9337 ==========================
9339 * ~700 changes, numerous bugfixes
9345 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9346 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9347 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9348 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9349 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9350 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9351 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9352 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9353 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9354 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9355 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9356 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9357 [`Path::read_link`], [`Path::symlink_metadata`],
9358 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9359 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9360 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9361 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9362 [`slice::split_first_mut`], [`slice::split_first`],
9363 [`slice::split_last_mut`], [`slice::split_last`],
9364 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9365 [`str::MatchIndices`], [`str::RMatchIndices`],
9366 [`str::match_indices`], [`str::rmatch_indices`],
9367 [`str::slice_mut_unchecked`], [`string::ParseError`].
9368 * Rust applications hosted on crates.io can be installed locally to
9369 `~/.cargo/bin` with the [`cargo install`] command. Among other
9370 things this makes it easier to augment Cargo with new subcommands:
9371 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9372 invoked as `cargo foo`.
9373 * Crates with wildcard (`*`) dependencies will [emit warnings when
9374 published][1.5w]. In 1.6 it will no longer be possible to publish
9375 crates with wildcard dependencies.
9380 * The rules determining when a particular lifetime must outlive
9381 a particular value (known as '[dropck]') have been [modified
9382 to not rely on parametricity][1.5p].
9383 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9384 and `Arc`][1.5a]. Because these smart pointer types implement
9385 `Deref`, this causes breakage in cases where the interior type
9386 contains methods of the same name.
9387 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9388 that they could drop their content. Soundness fix.
9389 * All method invocations are [properly checked][1.5wf1] for
9390 [well-formedness][1.5wf2]. Soundness fix.
9391 * Traits whose supertraits contain `Self` are [not object
9392 safe][1.5o]. Soundness fix.
9393 * Target specifications support a [`no_default_libraries`][1.5nd]
9394 setting that controls whether `-nodefaultlibs` is passed to the
9395 linker, and in turn the `is_like_windows` setting no longer affects
9396 the `-nodefaultlibs` flag.
9397 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9398 * The `#[inline]` and `#[repr]` attributes [can only appear
9399 in valid locations][1.5at].
9400 * Native libraries linked from the local crate are [passed to
9401 the linker before native libraries from upstream crates][1.5nl].
9402 * Two rarely-used attributes, `#[no_debug]` and
9403 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9404 * Negation of unsigned integers, which has been a warning for
9405 several releases, [is now behind a feature gate and will
9406 generate errors][1.5nu].
9407 * The parser accidentally accepted visibility modifiers on
9408 enum variants, a bug [which has been fixed][1.5ev].
9409 * [A bug was fixed that allowed `use` statements to import unstable
9415 * When evaluating expressions at compile-time that are not
9416 compile-time constants (const-evaluating expressions in non-const
9417 contexts), incorrect code such as overlong bitshifts and arithmetic
9418 overflow will [generate a warning instead of an error][1.5ce],
9419 delaying the error until runtime. This will allow the
9420 const-evaluator to be expanded in the future backwards-compatibly.
9421 * The `improper_ctypes` lint [no longer warns about using `isize` and
9422 `usize` in FFI][1.5ict].
9427 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9429 * `Default` is [implemented for mutable slices][1.5d].
9430 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9431 * There are now `From` conversions [between floating point
9432 types][1.5f] where the conversions are lossless.
9433 * There are now `From` conversions [between integer types][1.5i] where
9434 the conversions are lossless.
9435 * [`fs::Metadata` implements `Clone`][1.5fs].
9436 * The `parse` method [accepts a leading "+" when parsing
9438 * [`AsMut` is implemented for `Vec`][1.5am].
9439 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9440 been optimized][1.5cf] and no longer rely on the default impl.
9441 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9442 `unsafe extern "C"` function types now [implement `Clone`,
9443 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9444 `fmt::Debug` for up to 12 arguments][1.5fp].
9445 * [Dropping `Vec`s is much faster in unoptimized builds when the
9446 element types don't implement `Drop`][1.5dv].
9447 * A bug that caused in incorrect behavior when [combining `VecDeque`
9448 with zero-sized types][1.5vdz] was resolved.
9449 * [`PartialOrd` for slices is faster][1.5po].
9454 * [Crate metadata size was reduced by 20%][1.5md].
9455 * [Improvements to code generation reduced the size of libcore by 3.3
9456 MB and rustc's memory usage by 18MB][1.5m].
9457 * [Improvements to deref translation increased performance in
9458 unoptimized builds][1.5dr].
9459 * Various errors in trait resolution [are deduplicated to only be
9460 reported once][1.5te].
9461 * Rust has preliminary [support for rumprun kernels][1.5rr].
9462 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9464 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9465 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9466 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9467 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9468 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9469 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9470 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9471 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9472 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9473 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9474 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9475 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9476 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9477 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9478 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9479 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9480 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9481 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9482 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9483 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9484 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9485 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9486 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9487 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9488 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9489 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9490 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9491 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9492 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9493 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9494 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9495 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9496 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9497 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9498 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9499 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9500 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9501 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9502 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9503 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9504 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9505 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9506 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9507 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9508 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9509 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9510 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9511 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9512 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9513 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9514 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9515 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9516 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9517 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9518 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9519 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9520 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9521 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9522 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9523 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9524 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9525 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9526 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9527 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9528 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9529 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9530 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9531 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9532 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9533 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9534 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9535 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9536 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9537 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9538 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9539 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9540 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9541 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9542 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9543 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9544 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9545 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9546 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9547 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9548 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9549 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9550 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9551 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9552 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9554 Version 1.4.0 (2015-10-29)
9555 ==========================
9557 * ~1200 changes, numerous bugfixes
9562 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9563 GNU) are now supported and recommended for use.
9568 * [Several changes have been made to fix type soundness and improve
9569 the behavior of associated types][sound]. See [RFC 1214]. Although
9570 we have mostly introduced these changes as warnings this release, to
9571 become errors next release, there are still some scenarios that will
9572 see immediate breakage.
9573 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9574 line breaks in addition to `\n`][crlf].
9575 * [Loans of `'static` lifetime extend to the end of a function][stat].
9576 * [`str::parse` no longer introduces avoidable rounding error when
9577 parsing floating point numbers. Together with earlier changes to
9578 float formatting/output, "round trips" like f.to_string().parse()
9579 now preserve the value of f exactly. Additionally, leading plus
9580 signs are now accepted][fp3].
9586 * `use` statements that import multiple items [can now rename
9587 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9588 * [Binops work correctly on fat pointers][binfat].
9589 * `pub extern crate`, which does not behave as expected, [issues a
9590 warning][pec] until a better solution is found.
9595 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9596 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9597 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9598 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9599 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9600 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9601 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9602 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9603 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9604 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9605 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9606 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9607 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9608 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9609 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9610 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9611 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9612 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9614 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9615 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9616 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9617 `f64::from_str_radix`.
9618 * [Reverse-searching strings is faster with the 'two-way'
9620 * [`std::io::copy` allows `?Sized` arguments][cc].
9621 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9622 [override `count`, `nth` and `last` with an *O*(1)
9623 implementation][it].
9624 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9625 * [`IntoRawFd` has been added to the Unix-specific prelude,
9626 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9628 * [`Extend<String>` and `FromIterator<String` are both implemented for
9630 * [`IntoIterator` is implemented for references to `Option` and
9632 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9633 Copy`][ext] as part of [RFC 839]. This will cause type inference
9634 breakage in rare situations.
9635 * [`BinaryHeap` implements `Debug`][bh2].
9636 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9638 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9639 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9640 * [String comparison is faster][faststr].
9641 * `&mut T` where `T: std::fmt::Write` [also implements
9642 `std::fmt::Write`][mutw].
9643 * [A stable regression in `VecDeque::push_back` and other
9644 capacity-altering methods that caused panics for zero-sized types
9646 * [Function pointers implement traits for up to 12 parameters][fp2].
9651 * The compiler [no longer uses the 'morestack' feature to prevent
9652 stack overflow][mm]. Instead it uses guard pages and stack
9653 probes (though stack probes are not yet implemented on any platform
9655 * [The compiler matches traits faster when projections are involved][p].
9656 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9658 * [Cargo now displays useful information about what its doing during
9659 `cargo update`][cu].
9661 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9662 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9663 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9664 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9665 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9666 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9667 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9668 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9669 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9670 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9671 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9672 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9673 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9674 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9675 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9676 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9677 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9678 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9679 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9680 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9681 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9682 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9683 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9684 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9685 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9686 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9687 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9688 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9689 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9690 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9691 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9692 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9693 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9694 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9695 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9696 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9697 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9698 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9699 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9700 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9701 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9702 [bh2]: https://github.com/rust-lang/rust/pull/28156
9703 [binfat]: https://github.com/rust-lang/rust/pull/28270
9704 [bm]: https://github.com/rust-lang/rust/pull/28197
9705 [cc]: https://github.com/rust-lang/rust/pull/27531
9706 [crlf]: https://github.com/rust-lang/rust/pull/28034
9707 [cu]: https://github.com/rust-lang/cargo/pull/1931
9708 [d]: https://github.com/rust-lang/rust/pull/27825
9709 [dep]: https://github.com/rust-lang/rust/pull/28339
9710 [es]: https://github.com/rust-lang/rust/pull/27956
9711 [ext]: https://github.com/rust-lang/rust/pull/28094
9712 [faststr]: https://github.com/rust-lang/rust/pull/28338
9713 [ffi]: https://github.com/rust-lang/rust/pull/28779
9714 [fp]: https://github.com/rust-lang/rust/pull/28268
9715 [fp2]: https://github.com/rust-lang/rust/pull/28560
9716 [fp3]: https://github.com/rust-lang/rust/pull/27307
9717 [i]: https://github.com/rust-lang/rust/pull/27451
9718 [into2]: https://github.com/rust-lang/rust/pull/28039
9719 [it]: https://github.com/rust-lang/rust/pull/27652
9720 [mm]: https://github.com/rust-lang/rust/pull/27338
9721 [mutw]: https://github.com/rust-lang/rust/pull/28368
9722 [sound]: https://github.com/rust-lang/rust/pull/27641
9723 [p]: https://github.com/rust-lang/rust/pull/27866
9724 [pec]: https://github.com/rust-lang/rust/pull/28486
9725 [pr]: https://github.com/rust-lang/rust/pull/27896
9726 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9727 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9728 [s]: https://github.com/rust-lang/rust/pull/27474
9729 [stab]: https://github.com/rust-lang/rust/pull/28339
9730 [stat]: https://github.com/rust-lang/rust/pull/28321
9731 [vd]: https://github.com/rust-lang/rust/pull/28494
9733 Version 1.3.0 (2015-09-17)
9734 ==============================
9736 * ~900 changes, numerous bugfixes
9741 * The [new object lifetime defaults][nold] have been [turned
9742 on][nold2] after a cycle of warnings about the change. Now types
9743 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9744 being interpreted as `&'a Box<Trait+'a>` to `&'a
9745 Box<Trait+'static>`.
9746 * [The Rustonomicon][nom] is a new book in the official documentation
9747 that dives into writing unsafe Rust.
9748 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9749 timekeeping is employed by other std APIs, as well as out-of-tree
9755 * The [new object lifetime defaults][nold] have been [turned
9756 on][nold2] after a cycle of warnings about the change.
9757 * There is a known [regression][lr] in how object lifetime elision is
9758 interpreted, the proper solution for which is undetermined.
9759 * The `#[prelude_import]` attribute, an internal implementation
9760 detail, was accidentally stabilized previously. [It has been put
9761 behind the `prelude_import` feature gate][pi]. This change is
9762 believed to break no existing code.
9763 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9764 [more sane for dynamically sized types][dst3]. Code that relied on
9765 the previous behavior is thought to be broken.
9766 * The `dropck` rules, which checks that destructors can't access
9767 destroyed values, [have been updated][dropck] to match the
9768 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9769 cause some previously-compiling code to no longer build.
9774 * The [new object lifetime defaults][nold] have been [turned
9775 on][nold2] after a cycle of warnings about the change.
9776 * Semicolons may [now follow types and paths in
9777 macros](https://github.com/rust-lang/rust/pull/27000).
9778 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9779 [more sane for dynamically sized types][dst3]. Code that relied on
9780 the previous behavior is not known to exist, and suspected to be
9782 * `'static` variables [may now be recursive][st].
9783 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9784 implementations correctly.
9785 * The `dropck` rules, which checks that destructors can't access
9786 destroyed values, [have been updated][dropck] to match the
9792 * The [`Duration`] API, [has been stabilized][ds], as well as the
9793 `std::time` module, which presently contains only `Duration`.
9794 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9795 * The owned C string, [`CString`], implements [`Borrow`] and the
9796 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9797 these allow C strings to be borrowed and cloned in generic code.
9798 * [`CStr`] implements [`Debug`].
9799 * [`AtomicPtr`] implements [`Debug`].
9800 * [`Error`] trait objects [can be downcast to their concrete types][e]
9801 in many common configurations, using the [`is`], [`downcast`],
9802 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9804 * Searching for substrings now [employs the two-way algorithm][search]
9805 instead of doing a naive search. This gives major speedups to a
9806 number of methods, including [`contains`][sc], [`find`][sf],
9807 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9808 [`ends_with`][sew] are also faster.
9809 * The performance of `PartialEq` for slices is [much faster][ps].
9810 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9811 is overridden and optimized by the implementations for scalars.
9812 * The [`Hasher`] trait now has a number of specialized `write_*`
9813 methods for primitive types, for efficiency.
9814 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9815 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9816 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9817 of [`std::error::Error::cause`][iec] also delegates to the inner
9819 * [`process::Child`][pc] gained the [`id`] method, which returns a
9820 `u32` representing the platform-specific process identifier.
9821 * The [`connect`] method on slices is deprecated, replaced by the new
9822 [`join`] method (note that both of these are on the *unstable*
9823 [`SliceConcatExt`] trait, but through the magic of the prelude are
9824 available to stable code anyway).
9825 * The [`Div`] operator is implemented for [`Wrapping`] types.
9826 * [`DerefMut` is implemented for `String`][dms].
9827 * Performance of SipHash (the default hasher for `HashMap`) is
9828 [better for long data][sh].
9829 * [`AtomicPtr`] implements [`Send`].
9830 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9831 are now [specialized to use uninitialized buffers for increased
9833 * Lifetime parameters of foreign functions [are now resolved
9839 * Rust can now, with some coercion, [produce programs that run on
9840 Windows XP][xp], though XP is not considered a supported platform.
9841 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9842 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9843 recommended for use in 1.3, though should be fully-functional
9844 in the [64-bit 1.4 beta][b14].
9845 * On Fedora-based systems installation will [properly configure the
9846 dynamic linker][fl].
9847 * The compiler gained many new extended error descriptions, which can
9848 be accessed with the `--explain` flag.
9849 * The `dropck` pass, which checks that destructors can't access
9850 destroyed values, [has been rewritten][27261]. This fixes some
9851 soundness holes, and as such will cause some previously-compiling
9852 code to no longer build.
9853 * `rustc` now uses [LLVM to write archive files where possible][ar].
9854 Eventually this will eliminate the compiler's dependency on the ar
9856 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9857 supported FreeBSD on x86_64).
9858 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9859 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9861 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9862 will kill the process instead of leaking][nlp].
9864 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9865 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9866 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9867 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9868 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9869 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9870 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9871 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9872 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9873 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9874 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9875 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9876 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9877 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9878 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9879 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9880 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9881 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9882 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9883 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9884 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9885 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9886 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9887 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9888 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9889 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9890 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9891 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9892 [ar]: https://github.com/rust-lang/rust/pull/26926
9893 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9894 [dms]: https://github.com/rust-lang/rust/pull/26241
9895 [27261]: https://github.com/rust-lang/rust/pull/27261
9896 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9897 [ds]: https://github.com/rust-lang/rust/pull/26818
9898 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9899 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9900 [dst3]: https://github.com/rust-lang/rust/pull/27351
9901 [e]: https://github.com/rust-lang/rust/pull/24793
9902 [f]: https://github.com/rust-lang/rust/pull/26588
9903 [26959]: https://github.com/rust-lang/rust/pull/26959
9904 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9905 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9906 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9907 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9908 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9909 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9910 [lic]: https://github.com/rust-lang/rust/pull/26583
9911 [lnu]: https://github.com/rust-lang/rust/pull/27026
9912 [lr]: https://github.com/rust-lang/rust/issues/27248
9913 [lum]: https://github.com/rust-lang/rust/pull/26378
9914 [lur]: https://github.com/rust-lang/rust/pull/26783
9915 [nlp]: https://github.com/rust-lang/rust/pull/27176
9916 [nold2]: https://github.com/rust-lang/rust/pull/27045
9917 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9918 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9919 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9920 [pi]: https://github.com/rust-lang/rust/pull/26699
9921 [ps]: https://github.com/rust-lang/rust/pull/26884
9922 [rte]: https://github.com/rust-lang/rust/pull/26950
9923 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9924 [search]: https://github.com/rust-lang/rust/pull/26327
9925 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9926 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9927 [sh]: https://github.com/rust-lang/rust/pull/27280
9928 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9929 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9930 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9931 [st]: https://github.com/rust-lang/rust/pull/26630
9932 [win1]: https://github.com/rust-lang/rust/pull/26569
9933 [win2]: https://github.com/rust-lang/rust/pull/26741
9934 [win3]: https://github.com/rust-lang/rust/pull/26741
9935 [win4]: https://github.com/rust-lang/rust/pull/27210
9936 [xp]: https://github.com/rust-lang/rust/pull/26569
9938 Version 1.2.0 (2015-08-07)
9939 ==========================
9941 * ~1200 changes, numerous bugfixes
9946 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9947 like `Rc` to contain types without a fixed size, arrays and trait
9948 objects, finally enabling use of `Rc<[T]>` and completing the
9949 implementation of DST.
9950 * [Parallel codegen][parcodegen] is now working again, which can
9951 substantially speed up large builds in debug mode; It also gets
9952 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9953 jobs). It's not enabled by default, but will be "in the near
9954 future". It can be activated with the `-C codegen-units=N` flag to
9956 * This is the first release with [experimental support for linking
9957 with the MSVC linker and lib C on Windows (instead of using the GNU
9958 variants via MinGW)][win]. It is yet recommended only for the most
9959 intrepid Rustaceans.
9960 * Benchmark compilations are showing a 30% improvement in
9961 bootstrapping over 1.1.
9966 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9967 unicode case mapping, which is a previously-planned change in
9968 behavior and considered a bugfix.
9969 * [`mem::align_of`] now specifies [the *minimum alignment* for
9970 T][align], which is usually the alignment programs are interested
9971 in, and the same value reported by clang's
9972 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9974 * [The `#[packed]` attribute is no longer silently accepted by the
9975 compiler][packed]. This attribute did nothing and code that
9976 mentioned it likely did not work as intended.
9977 * Associated type defaults are [now behind the
9978 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9979 defaults *did not work*, but could be mentioned syntactically. As
9980 such this breakage has minimal impact.
9985 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9986 matching against dereferenceable values.
9991 * The [`Extend`] trait, which grows a collection from an iterator, is
9992 implemented over iterators of references, for `String`, `Vec`,
9993 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9994 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9995 * The [`iter::once`] function returns an iterator that yields a single
9996 element, and [`iter::empty`] returns an iterator that yields no
9998 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9999 over substring matches.
10000 * [`Cell`] and [`RefCell`] both implement `Eq`.
10001 * A number of methods for wrapping arithmetic are added to the
10002 integral types, [`wrapping_div`], [`wrapping_rem`],
10003 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10004 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10005 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10006 type.. It is illegal for the default arithmetic operations in Rust
10007 to overflow; the desire to wrap must be explicit.
10008 * The `{:#?}` formatting specifier [displays the alternate,
10009 pretty-printed][debugfmt] form of the `Debug` formatter. This
10010 feature was actually introduced prior to 1.0 with little
10012 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10013 for writing data to formatted strings, similar to [`io::Write`].
10014 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10015 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10016 are used by code generators to emit implementations of [`Debug`].
10017 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10018 methods that convert case, following Unicode case mapping.
10019 * It is now easier to handle poisoned locks. The [`PoisonError`]
10020 type, returned by failing lock operations, exposes `into_inner`,
10021 `get_ref`, and `get_mut`, which all give access to the inner lock
10022 guard, and allow the poisoned lock to continue to operate. The
10023 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10024 poisoned lock without attempting to take the lock.
10025 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10026 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10027 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10028 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10030 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10036 * `rustc` employs smarter heuristics for guessing at [typos].
10037 * `rustc` emits more efficient code for [no-op conversions between
10038 unsafe pointers][nop].
10039 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10040 resulting in faster compile times and smaller code.
10042 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10043 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10044 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10045 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10046 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10047 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10048 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10049 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10050 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10051 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10052 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10053 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10054 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10055 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10056 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10057 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10058 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10059 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10060 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10061 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10062 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10063 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10064 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10065 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10066 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10067 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10068 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10069 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10070 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10071 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10072 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10073 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10074 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10075 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10076 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10077 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10078 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10079 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10080 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10081 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10082 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10083 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10084 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10085 [align]: https://github.com/rust-lang/rust/pull/25646
10086 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10087 [typos]: https://github.com/rust-lang/rust/pull/26087
10088 [nop]: https://github.com/rust-lang/rust/pull/26336
10089 [fat]: https://github.com/rust-lang/rust/pull/26411
10090 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10091 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10092 [packed]: https://github.com/rust-lang/rust/pull/25541
10093 [ad]: https://github.com/rust-lang/rust/pull/27382
10094 [win]: https://github.com/rust-lang/rust/pull/25350
10096 Version 1.1.0 (2015-06-25)
10097 =========================
10099 * ~850 changes, numerous bugfixes
10104 * The [`std::fs` module has been expanded][fs] to expand the set of
10105 functionality exposed:
10106 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10107 don't incur a syscall on some platforms.
10108 * A `symlink_metadata` function has been added.
10109 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10110 access to all underlying information.
10111 * The compiler now contains extended explanations of many errors. When an error
10112 with an explanation occurs the compiler suggests using the `--explain` flag
10113 to read the explanation. Error explanations are also [available online][err-index].
10114 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10115 well as other work, the time to bootstrap the compiler decreased by
10121 * The [`str::split_whitespace`] method splits a string on unicode
10122 whitespace boundaries.
10123 * On both Windows and Unix, new extension traits provide conversion of
10124 I/O types to and from the underlying system handles. On Unix, these
10125 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10126 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10127 `TcpListener`, and `UpdSocket`. Further implementations for
10128 `std::process` will be stabilized later.
10129 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10130 Windows, symlinks can be created with
10131 `std::os::windows::symlink_dir` and
10132 `std::os::windows::symlink_file`.
10133 * The `mpsc::Receiver` type can now be converted into an iterator with
10134 `into_iter` on the [`IntoIterator`] trait.
10135 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10136 implementation of the [`From`] trait.
10137 * The `Debug` implementation for `RangeFull` [creates output that is
10138 more consistent with other implementations][rf].
10139 * [`Debug` is implemented for `File`][file].
10140 * The `Default` implementation for `Arc` [no longer requires `Sync +
10142 * [The `Iterator` methods `count`, `nth`, and `last` have been
10143 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10144 * Incorrect handling of paths on Windows has been improved in both the
10145 compiler and the standard library.
10146 * [`AtomicPtr` gained a `Default` implementation][ap].
10147 * In accordance with Rust's policy on arithmetic overflow `abs` now
10148 [panics on overflow when debug assertions are enabled][abs].
10149 * The [`Cloned`] iterator, which was accidentally left unstable for
10150 1.0 [has been stabilized][c].
10151 * The [`Incoming`] iterator, which iterates over incoming TCP
10152 connections, and which was accidentally unnamable in 1.0, [is now
10153 properly exported][inc].
10154 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10155 `sift_up` or `sift_down` panic][bh].
10156 * The [`split_off`] method of `LinkedList` [no longer corrupts
10157 the list in certain scenarios][ll].
10162 * Type checking performance [has improved notably][sk] with
10163 [multiple improvements][pre].
10164 * The compiler [suggests code changes][ch] for more errors.
10165 * rustc and it's build system have experimental support for [building
10166 toolchains against MUSL][m] instead of glibc on Linux.
10167 * The compiler defines the `target_env` cfg value, which is used for
10168 distinguishing toolchains that are otherwise for the same
10169 platform. Presently this is set to `gnu` for common GNU Linux
10170 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10171 * The [`cargo rustc`][crc] command invokes a build with custom flags
10173 * [Android executables are always position independent][pie].
10174 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10175 with `Drop`][24935].
10177 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10178 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10179 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10180 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10181 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10182 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10183 [rf]: https://github.com/rust-lang/rust/pull/24491
10184 [err-index]: https://doc.rust-lang.org/error-index.html
10185 [sk]: https://github.com/rust-lang/rust/pull/24615
10186 [pre]: https://github.com/rust-lang/rust/pull/25323
10187 [file]: https://github.com/rust-lang/rust/pull/24598
10188 [ch]: https://github.com/rust-lang/rust/pull/24683
10189 [arc]: https://github.com/rust-lang/rust/pull/24695
10190 [si]: https://github.com/rust-lang/rust/pull/24701
10191 [ap]: https://github.com/rust-lang/rust/pull/24834
10192 [m]: https://github.com/rust-lang/rust/pull/24777
10193 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10194 [crc]: https://github.com/rust-lang/cargo/pull/1568
10195 [pie]: https://github.com/rust-lang/rust/pull/24953
10196 [abs]: https://github.com/rust-lang/rust/pull/25441
10197 [c]: https://github.com/rust-lang/rust/pull/25496
10198 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10199 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10200 [inc]: https://github.com/rust-lang/rust/pull/25522
10201 [bh]: https://github.com/rust-lang/rust/pull/25856
10202 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10203 [ll]: https://github.com/rust-lang/rust/pull/26022
10204 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10205 [24935]: https://github.com/rust-lang/rust/pull/24935
10207 Version 1.0.0 (2015-05-15)
10208 ========================
10210 * ~1500 changes, numerous bugfixes
10215 * The vast majority of the standard library is now `#[stable]`. It is
10216 no longer possible to use unstable features with a stable build of
10218 * Many popular crates on [crates.io] now work on the stable release
10220 * Arithmetic on basic integer types now [checks for overflow in debug
10226 * Several [restrictions have been added to trait coherence][coh] in
10227 order to make it easier for upstream authors to change traits
10228 without breaking downstream code.
10229 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10230 improve error messages and macro behavior. For example, `0b1234` is
10231 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10232 * Trait bounds [are always invariant][inv], eliminating the need for
10233 the `PhantomFn` and `MarkerTrait` lang items, which have been
10235 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10236 "foo" as bar` syntax has been replaced with `extern crate foo as
10237 bar`, and Cargo now automatically translates "-" in *package* names
10238 to underscore for the crate name.
10239 * [Lifetime shadowing is an error][lt].
10240 * [`Send` no longer implies `'static`][send-rfc].
10241 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10242 `MyType::default()`.
10243 * Primitive types [now have inherent methods][prim-inherent],
10244 obviating the need for extension traits like `SliceExt`.
10245 * Methods with `Self: Sized` in their `where` clause are [considered
10246 object-safe][self-sized], allowing many extension traits like
10247 `IteratorExt` to be merged into the traits they extended.
10248 * You can now [refer to associated types][assoc-where] whose
10249 corresponding trait bounds appear only in a `where` clause.
10250 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10251 like `Send` and `Sync` are now library-defined.
10252 * A [Reflect trait][reflect] was introduced, which means that
10253 downcasting via the `Any` trait is effectively limited to concrete
10254 types. This helps retain the potentially-important "parametricity"
10255 property: generic code cannot behave differently for different type
10256 arguments except in minor ways.
10257 * The `unsafe_destructor` feature is now deprecated in favor of the
10258 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10264 * The `thread_local` module [has been renamed to `std::thread`][th].
10265 * The methods of `IteratorExt` [have been moved to the `Iterator`
10266 trait itself][23300].
10267 * Several traits that implement Rust's conventions for type
10268 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10269 [centralized in the `std::convert` module][con].
10270 * The `FromError` trait [was removed in favor of `From`][fe].
10271 * The basic sleep function [has moved to
10272 `std::thread::sleep_ms`][slp].
10273 * The `splitn` function now takes an `n` parameter that represents the
10274 number of items yielded by the returned iterator [instead of the
10275 number of 'splits'][spl].
10276 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10277 * [Derived implementations of `PartialOrd` now order enums according
10278 to their explicitly-assigned discriminants][po].
10279 * [Methods for searching strings are generic over `Pattern`s][pat],
10280 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10282 * [In method resolution, object methods are resolved before inherent
10284 * [`String::from_str` has been deprecated in favor of the `From` impl,
10285 `String::from`][24517].
10286 * [`io::Error` implements `Sync`][ios].
10287 * [The `words` method on `&str` has been replaced with
10288 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10290 * The new path and IO modules are complete and `#[stable]`. This
10291 was the major library focus for this cycle.
10292 * The path API was [revised][path-normalize] to normalize `.`,
10293 adjusting the tradeoffs in favor of the most common usage.
10294 * A large number of remaining APIs in `std` were also stabilized
10295 during this cycle; about 75% of the non-deprecated API surface
10297 * The new [string pattern API][string-pattern] landed, which makes
10298 the string slice API much more internally consistent and flexible.
10299 * A new set of [generic conversion traits][conversion] replaced
10300 many existing ad hoc traits.
10301 * Generic numeric traits were [completely removed][num-traits]. This
10302 was made possible thanks to inherent methods for primitive types,
10303 and the removal gives maximal flexibility for designing a numeric
10304 hierarchy in the future.
10305 * The `Fn` traits are now related via [inheritance][fn-inherit]
10306 and provide ergonomic [blanket implementations][fn-blanket].
10307 * The `Index` and `IndexMut` traits were changed to
10308 [take the index by value][index-value], enabling code like
10309 `hash_map["string"]` to work.
10310 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10311 `Copy` data is known to be `Clone` as well.
10316 * Many errors now have extended explanations that can be accessed with
10317 the `--explain` flag to `rustc`.
10318 * Many new examples have been added to the standard library
10320 * rustdoc has received a number of improvements focused on completion
10322 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10323 * Much headway was made on ecosystem-wide CI, making it possible
10324 to [compare builds for breakage][ci-compare].
10327 [crates.io]: http://crates.io
10328 [clo]: https://github.com/rust-lang/rust/pull/24034
10329 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10330 [con]: https://github.com/rust-lang/rust/pull/23875
10331 [cr]: https://github.com/rust-lang/rust/pull/23419
10332 [fe]: https://github.com/rust-lang/rust/pull/23879
10333 [23300]: https://github.com/rust-lang/rust/pull/23300
10334 [inv]: https://github.com/rust-lang/rust/pull/23938
10335 [ios]: https://github.com/rust-lang/rust/pull/24133
10336 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10337 [lt]: https://github.com/rust-lang/rust/pull/24057
10338 [meth]: https://github.com/rust-lang/rust/pull/24056
10339 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10340 [po]: https://github.com/rust-lang/rust/pull/24270
10341 [24517]: https://github.com/rust-lang/rust/pull/24517
10342 [slp]: https://github.com/rust-lang/rust/pull/23949
10343 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10344 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10345 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10346 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10347 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10348 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10349 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10350 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10351 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10352 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10353 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10354 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10355 [reflect]: https://github.com/rust-lang/rust/pull/23712
10356 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10357 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10358 [index-value]: https://github.com/rust-lang/rust/pull/23601
10359 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10360 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10361 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10362 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10363 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10364 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10367 Version 1.0.0-alpha.2 (2015-02-20)
10368 =====================================
10370 * ~1300 changes, numerous bugfixes
10374 * The various I/O modules were [overhauled][io-rfc] to reduce
10375 unnecessary abstractions and provide better interoperation with
10376 the underlying platform. The old `io` module remains temporarily
10378 * The standard library now [participates in feature gating][feat],
10379 so use of unstable libraries now requires a `#![feature(...)]`
10380 attribute. The impact of this change is [described on the
10381 forum][feat-forum]. [RFC][feat-rfc].
10385 * `for` loops [now operate on the `IntoIterator` trait][into],
10386 which eliminates the need to call `.iter()`, etc. to iterate
10387 over collections. There are some new subtleties to remember
10388 though regarding what sort of iterators various types yield, in
10389 particular that `for foo in bar { }` yields values from a move
10390 iterator, destroying the original collection. [RFC][into-rfc].
10391 * Objects now have [default lifetime bounds][obj], so you don't
10392 have to write `Box<Trait+'static>` when you don't care about
10393 storing references. [RFC][obj-rfc].
10394 * In types that implement `Drop`, [lifetimes must outlive the
10395 value][drop]. This will soon make it possible to safely
10396 implement `Drop` for types where `#[unsafe_destructor]` is now
10397 required. Read the [gorgeous RFC][drop-rfc] for details.
10398 * The fully qualified <T as Trait>::X syntax lets you set the Self
10399 type for a trait method or associated type. [RFC][ufcs-rfc].
10400 * References to types that implement `Deref<U>` now [automatically
10401 coerce to references][deref] to the dereferenced type `U`,
10402 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10403 should eliminate many unsightly uses of `&*`, as when converting
10404 from references to vectors into references to
10405 slices. [RFC][deref-rfc].
10406 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10407 `|:|`) is obsolete and closure kind is inferred from context.
10408 * [`Self` is a keyword][Self].
10412 * The `Show` and `String` formatting traits [have been
10413 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10414 their related purposes. Automatically getting a string
10415 conversion to use with `format!("{:?}", something_to_debug)` is
10416 now written `#[derive(Debug)]`.
10417 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10418 OsStr}`, provide strings in platform-specific encodings for easier
10419 interop with system APIs. [RFC][osstr-rfc].
10420 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10421 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10422 creating raw pointers.
10426 * Certain long error messages of the form 'expected foo found bar'
10427 are now [split neatly across multiple
10428 lines][multiline]. Examples in the PR.
10429 * On Unix Rust can be [uninstalled][un] by running
10430 `/usr/local/lib/rustlib/uninstall.sh`.
10431 * The `#[rustc_on_unimplemented]` attribute, requiring the
10432 'on_unimplemented' feature, lets rustc [display custom error
10433 messages when a trait is expected to be implemented for a type
10438 * Rust is tested against a [LALR grammar][lalr], which parses
10439 almost all the Rust files that rustc does.
10441 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10442 [close]: https://github.com/rust-lang/rust/pull/21843
10443 [deref]: https://github.com/rust-lang/rust/pull/21351
10444 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10445 [drop]: https://github.com/rust-lang/rust/pull/21972
10446 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10447 [feat]: https://github.com/rust-lang/rust/pull/21248
10448 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10449 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10450 [fmt]: https://github.com/rust-lang/rust/pull/21457
10451 [into]: https://github.com/rust-lang/rust/pull/20790
10452 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10453 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10454 [lalr]: https://github.com/rust-lang/rust/pull/21452
10455 [multiline]: https://github.com/rust-lang/rust/pull/19870
10456 [obj]: https://github.com/rust-lang/rust/pull/22230
10457 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10458 [onun]: https://github.com/rust-lang/rust/pull/20889
10459 [osstr]: https://github.com/rust-lang/rust/pull/21488
10460 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10461 [Self]: https://github.com/rust-lang/rust/pull/22158
10462 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10463 [un]: https://github.com/rust-lang/rust/pull/22256
10466 Version 1.0.0-alpha (2015-01-09)
10467 ==================================
10469 * ~2400 changes, numerous bugfixes
10473 * The language itself is considered feature complete for 1.0,
10474 though there will be many usability improvements and bugfixes
10475 before the final release.
10476 * Nearly 50% of the public API surface of the standard library has
10477 been declared 'stable'. Those interfaces are unlikely to change
10479 * The long-running debate over integer types has been
10480 [settled][ints]: Rust will ship with types named `isize` and
10481 `usize`, rather than `int` and `uint`, for pointer-sized
10482 integers. Guidelines will be rolled out during the alpha cycle.
10483 * Most crates that are not `std` have been moved out of the Rust
10484 distribution into the Cargo ecosystem so they can evolve
10485 separately and don't need to be stabilized as quickly, including
10486 'time', 'getopts', 'num', 'regex', and 'term'.
10487 * Documentation continues to be expanded with more API coverage, more
10488 examples, and more in-depth explanations. The guides have been
10489 consolidated into [The Rust Programming Language][trpl].
10490 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10491 * All official Rust binary installers now come with [Cargo], the
10492 Rust package manager.
10496 * Closures have been [completely redesigned][unboxed] to be
10497 implemented in terms of traits, can now be used as generic type
10498 bounds and thus monomorphized and inlined, or via an opaque
10499 pointer (boxed) as in the old system. The new system is often
10500 referred to as 'unboxed' closures.
10501 * Traits now support [associated types][assoc], allowing families
10502 of related types to be defined together and used generically in
10504 * Enum variants are [namespaced by their type names][enum].
10505 * [`where` clauses][where] provide a more versatile and attractive
10506 syntax for specifying generic bounds, though the previous syntax
10508 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10510 * Rust [no longer has a runtime][rt] of any description, and only
10511 supports OS threads, not green threads.
10512 * At long last, Rust has been overhauled for 'dynamically-sized
10513 types' ([DST]), which integrates 'fat pointers' (object types,
10514 arrays, and `str`) more deeply into the type system, making it
10516 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10517 `..j` that produce range types and which, when combined with the
10518 `Index` operator and multidispatch, leads to a convenient slice
10519 notation, `[i..j]`.
10520 * The new range syntax revealed an ambiguity in the fixed-length
10521 array syntax, so now fixed length arrays [are written `[T;
10523 * The `Copy` trait is no longer implemented automatically. Unsafe
10524 pointers no longer implement `Sync` and `Send` so types
10525 containing them don't automatically either. `Sync` and `Send`
10526 are now 'unsafe traits' so one can "forcibly" implement them via
10527 `unsafe impl` if a type confirms to the requirements for them
10528 even though the internals do not (e.g. structs containing unsafe
10529 pointers like `Arc`). These changes are intended to prevent some
10530 footguns and are collectively known as [opt-in built-in
10531 traits][oibit] (though `Sync` and `Send` will soon become pure
10532 library types unknown to the compiler).
10533 * Operator traits now take their operands [by value][ops], and
10534 comparison traits can use multidispatch to compare one type
10535 against multiple other types, allowing e.g. `String` to be
10536 compared with `&str`.
10537 * `if let` and `while let` are no longer feature-gated.
10538 * Rust has adopted a more [uniform syntax for escaping unicode
10539 characters][unicode].
10540 * `macro_rules!` [has been declared stable][mac]. Though it is a
10541 flawed system it is sufficiently popular that it must be usable
10542 for 1.0. Effort has gone into [future-proofing][mac-future] it
10543 in ways that will allow other macro systems to be developed in
10544 parallel, and won't otherwise impact the evolution of the
10546 * The prelude has been [pared back significantly][prelude] such
10547 that it is the minimum necessary to support the most pervasive
10548 code patterns, and through [generalized where clauses][where]
10549 many of the prelude extension traits have been consolidated.
10550 * Rust's rudimentary reflection [has been removed][refl], as it
10551 incurred too much code generation for little benefit.
10552 * [Struct variants][structvars] are no longer feature-gated.
10553 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10554 known as 'higher-ranked trait bounds', this crucially allows
10555 unboxed closures to work.
10556 * Macros invocations surrounded by parens or square brackets and
10557 not terminated by a semicolon are [parsed as
10558 expressions][macros], which makes expressions like `vec![1i32,
10559 2, 3].len()` work as expected.
10560 * Trait objects now implement their traits automatically, and
10561 traits that can be coerced to objects now must be [object
10563 * Automatically deriving traits is now done with `#[derive(...)]`
10564 not `#[deriving(...)]` for [consistency with other naming
10565 conventions][derive].
10566 * Importing the containing module or enum at the same time as
10567 items or variants they contain is [now done with `self` instead
10568 of `mod`][self], as in use `foo::{self, bar}`
10569 * Glob imports are no longer feature-gated.
10570 * The `box` operator and `box` patterns have been feature-gated
10571 pending a redesign. For now unique boxes should be allocated
10572 like other containers, with `Box::new`.
10576 * A [series][coll1] of [efforts][coll2] to establish
10577 [conventions][coll3] for collections types has resulted in API
10578 improvements throughout the standard library.
10579 * New [APIs for error handling][err] provide ergonomic interop
10580 between error types, and [new conventions][err-conv] describe
10581 more clearly the recommended error handling strategies in Rust.
10582 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10583 it is easier to discuss failure in the context of error handling
10584 without making clarifications as to whether you are referring to
10585 the 'fail' macro or failure more generally.
10586 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10587 syscall when available.
10588 * The 'serialize' crate has been renamed 'rustc-serialize' and
10589 moved out of the distribution to Cargo. Although it is widely
10590 used now, it is expected to be superseded in the near future.
10591 * The `Show` formatter, typically implemented with
10592 `#[derive(Show)]` is [now requested with the `{:?}`
10593 specifier][show] and is intended for use by all types, for uses
10594 such as `println!` debugging. The new `String` formatter must be
10595 implemented by hand, uses the `{}` specifier, and is intended
10596 for full-fidelity conversions of things that can logically be
10597 represented as strings.
10601 * [Flexible target specification][flex] allows rustc's code
10602 generation to be configured to support otherwise-unsupported
10604 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10605 respective debuggers with Rust-appropriate pretty-printing.
10606 * The Windows installation of Rust is distributed with the
10607 MinGW components currently required to link binaries on that
10612 * Nullable enum optimizations have been extended to more types so
10613 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10614 space than the inner types themselves.
10615 * Work has begun on supporting AArch64.
10617 [Cargo]: https://crates.io
10618 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10619 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10620 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10621 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10622 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10623 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10624 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10625 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10626 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10627 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10628 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10629 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10630 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10631 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10632 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10633 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10634 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10635 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10636 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10637 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10638 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10639 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10640 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10641 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10642 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10643 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10644 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10645 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10646 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10647 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10648 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10649 [trpl]: https://doc.rust-lang.org/book/index.html
10650 [rbe]: http://rustbyexample.com/
10653 Version 0.12.0 (2014-10-09)
10654 =============================
10656 * ~1900 changes, numerous bugfixes
10660 * The introductory documentation (now called The Rust Guide) has
10661 been completely rewritten, as have a number of supplementary
10663 * Rust's package manager, Cargo, continues to improve and is
10664 sometimes considered to be quite awesome.
10665 * Many API's in `std` have been reviewed and updated for
10666 consistency with the in-development Rust coding
10667 guidelines. The standard library documentation tracks
10668 stabilization progress.
10669 * Minor libraries have been moved out-of-tree to the rust-lang org
10670 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10671 be installed with Cargo.
10672 * Lifetime elision allows lifetime annotations to be left off of
10673 function declarations in many common scenarios.
10674 * Rust now works on 64-bit Windows.
10677 * Indexing can be overloaded with the `Index` and `IndexMut`
10679 * The `if let` construct takes a branch only if the `let` pattern
10680 matches, currently behind the 'if_let' feature gate.
10681 * 'where clauses', a more flexible syntax for specifying trait
10682 bounds that is more aesthetic, have been added for traits and
10683 free functions. Where clauses will in the future make it
10684 possible to constrain associated types, which would be
10685 impossible with the existing syntax.
10686 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10687 the 'slicing_syntax' feature gate, and can be overloaded with
10688 the `Slice` or `SliceMut` traits.
10689 * The syntax for matching of sub-slices has been changed to use a
10690 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10691 consistency with other uses of `..` and to future-proof
10692 potential additional uses of the syntax.
10693 * The syntax for matching inclusive ranges in patterns has changed
10694 from `0..3` to `0...4` to be consistent with the exclusive range
10695 syntax for slicing.
10696 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10697 c]`) has been put behind the 'advanced_slice_patterns' feature
10698 gate and may be removed in the future.
10699 * Components of tuples and tuple structs can be extracted using
10700 the `value.0` syntax, currently behind the `tuple_indexing`
10702 * The `#[crate_id]` attribute is no longer supported; versioning
10703 is handled by the package manager.
10704 * Renaming crate imports are now written `extern crate foo as bar`
10705 instead of `extern crate bar = foo`.
10706 * Renaming use statements are now written `use foo as bar` instead
10707 of `use bar = foo`.
10708 * `let` and `match` bindings and argument names in macros are now
10710 * The new, more efficient, closure types ('unboxed closures') have
10711 been added under a feature gate, 'unboxed_closures'. These will
10712 soon replace the existing closure types, once higher-ranked
10713 trait lifetimes are added to the language.
10714 * `move` has been added as a keyword, for indicating closures
10715 that capture by value.
10716 * Mutation and assignment is no longer allowed in pattern guards.
10717 * Generic structs and enums can now have trait bounds.
10718 * The `Share` trait is now called `Sync` to free up the term
10719 'shared' to refer to 'shared reference' (the default reference
10721 * Dynamically-sized types have been mostly implemented,
10722 unifying the behavior of fat-pointer types with the rest of the
10724 * As part of dynamically-sized types, the `Sized` trait has been
10725 introduced, which qualifying types implement by default, and
10726 which type parameters expect by default. To specify that a type
10727 parameter does not need to be sized, write `<Sized? T>`. Most
10728 types are `Sized`, notable exceptions being unsized arrays
10729 (`[T]`) and trait types.
10730 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10731 * Lifetime bounds can now be applied to type parameters and object
10733 * The old, reference counted GC type, `Gc<T>` which was once
10734 denoted by the `@` sigil, has finally been removed. GC will be
10735 revisited in the future.
10738 * Library documentation has been improved for a number of modules.
10739 * Bit-vectors, collections::bitv has been modernized.
10740 * The url crate is deprecated in favor of
10741 http://github.com/servo/rust-url, which can be installed with
10743 * Most I/O stream types can be cloned and subsequently closed from
10744 a different thread.
10745 * A `std::time::Duration` type has been added for use in I/O
10746 methods that rely on timers, as well as in the 'time' crate's
10747 `Timespec` arithmetic.
10748 * The runtime I/O abstraction layer that enabled the green thread
10749 scheduler to do non-thread-blocking I/O has been removed, along
10750 with the libuv-based implementation employed by the green thread
10751 scheduler. This will greatly simplify the future I/O work.
10752 * `collections::btree` has been rewritten to have a more
10753 idiomatic and efficient design.
10756 * rustdoc output now indicates the stability levels of API's.
10757 * The `--crate-name` flag can specify the name of the crate
10758 being compiled, like `#[crate_name]`.
10759 * The `-C metadata` specifies additional metadata to hash into
10760 symbol names, and `-C extra-filename` specifies additional
10761 information to put into the output filename, for use by the
10762 package manager for versioning.
10763 * debug info generation has continued to improve and should be
10764 more reliable under both gdb and lldb.
10765 * rustc has experimental support for compiling in parallel
10766 using the `-C codegen-units` flag.
10767 * rustc no longer encodes rpath information into binaries by
10771 * Stack usage has been optimized with LLVM lifetime annotations.
10772 * Official Rust binaries on Linux are more compatible with older
10773 kernels and distributions, built on CentOS 5.10.
10776 Version 0.11.0 (2014-07-02)
10777 ==========================
10779 * ~1700 changes, numerous bugfixes
10782 * ~[T] has been removed from the language. This type is superseded by
10784 * ~str has been removed from the language. This type is superseded by
10786 * ~T has been removed from the language. This type is superseded by the
10788 * @T has been removed from the language. This type is superseded by the
10789 standard library's std::gc::Gc<T> type.
10790 * Struct fields are now all private by default.
10791 * Vector indices and shift amounts are both required to be a `uint`
10792 instead of any integral type.
10793 * Byte character, byte string, and raw byte string literals are now all
10794 supported by prefixing the normal literal with a `b`.
10795 * Multiple ABIs are no longer allowed in an ABI string
10796 * The syntax for lifetimes on closures/procedures has been tweaked
10797 slightly: `<'a>|A, B|: 'b + K -> T`
10798 * Floating point modulus has been removed from the language; however it
10799 is still provided by a library implementation.
10800 * Private enum variants are now disallowed.
10801 * The `priv` keyword has been removed from the language.
10802 * A closure can no longer be invoked through a &-pointer.
10803 * The `use foo, bar, baz;` syntax has been removed from the language.
10804 * The transmute intrinsic no longer works on type parameters.
10805 * Statics now allow blocks/items in their definition.
10806 * Trait bounds are separated from objects with + instead of : now.
10807 * Objects can no longer be read while they are mutably borrowed.
10808 * The address of a static is now marked as insignificant unless the
10809 #[inline(never)] attribute is placed it.
10810 * The #[unsafe_destructor] attribute is now behind a feature gate.
10811 * Struct literals are no longer allowed in ambiguous positions such as
10812 if, while, match, and for..in.
10813 * Declaration of lang items and intrinsics are now feature-gated by
10815 * Integral literals no longer default to `int`, and floating point
10816 literals no longer default to `f64`. Literals must be suffixed with an
10817 appropriate type if inference cannot determine the type of the
10819 * The Box<T> type is no longer implicitly borrowed to &mut T.
10820 * Procedures are now required to not capture borrowed references.
10823 * The standard library is now a "facade" over a number of underlying
10824 libraries. This means that development on the standard library should
10825 be speedier due to smaller crates, as well as a clearer line between
10827 * A new library, libcore, lives under the standard library's facade
10828 which is Rust's "0-assumption" library, suitable for embedded and
10829 kernel development for example.
10830 * A regex crate has been added to the standard distribution. This crate
10831 includes statically compiled regular expressions.
10832 * The unwrap/unwrap_err methods on Result require a Show bound for
10833 better error messages.
10834 * The return types of the std::comm primitives have been centralized
10835 around the Result type.
10836 * A number of I/O primitives have gained the ability to time out their
10838 * A number of I/O primitives have gained the ability to close their
10839 reading/writing halves to cancel pending operations.
10840 * Reverse iterator methods have been removed in favor of `rev()` on
10841 their forward-iteration counterparts.
10842 * A bitflags! macro has been added to enable easy interop with C and
10843 management of bit flags.
10844 * A debug_assert! macro is now provided which is disabled when
10845 `--cfg ndebug` is passed to the compiler.
10846 * A graphviz crate has been added for creating .dot files.
10847 * The std::cast module has been migrated into std::mem.
10848 * The std::local_data api has been migrated from freestanding functions
10849 to being based on methods.
10850 * The Pod trait has been renamed to Copy.
10851 * jemalloc has been added as the default allocator for types.
10852 * The API for allocating memory has been changed to use proper alignment
10853 and sized deallocation
10854 * Connecting a TcpStream or binding a TcpListener is now based on a
10855 string address and a u16 port. This allows connecting to a hostname as
10857 * The Reader trait now contains a core method, read_at_least(), which
10858 correctly handles many repeated 0-length reads.
10859 * The process-spawning API is now centered around a builder-style
10861 * The :? printing qualifier has been moved from the standard library to
10862 an external libdebug crate.
10863 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10864 have been renamed to Eq/Ord.
10865 * The select/plural methods have been removed from format!. The escapes
10866 for { and } have also changed from \{ and \} to {{ and }},
10868 * The TaskBuilder API has been re-worked to be a true builder, and
10869 extension traits for spawning native/green tasks have been added.
10872 * All breaking changes to the language or libraries now have their
10873 commit message annotated with `[breaking-change]` to allow for easy
10874 discovery of breaking changes.
10875 * The compiler will now try to suggest how to annotate lifetimes if a
10876 lifetime-related error occurs.
10877 * Debug info continues to be improved greatly with general bug fixes and
10878 better support for situations like link time optimization (LTO).
10879 * Usage of syntax extensions when cross-compiling has been fixed.
10880 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10881 -fdata-sections and --gc-sections has been enabled by default
10882 * The compiler is now stricter about where it will load module files
10883 from when a module is declared via `mod foo;`.
10884 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10885 Syntax extensions are now discovered via a "plugin registrar" type
10886 which will be extended in the future to other various plugins.
10887 * Lints have been restructured to allow for dynamically loadable lints.
10888 * A number of rustdoc improvements:
10889 * The HTML output has been visually redesigned.
10890 * Markdown is now powered by hoedown instead of sundown.
10891 * Searching heuristics have been greatly improved.
10892 * The search index has been reduced in size by a great amount.
10893 * Cross-crate documentation via `pub use` has been greatly improved.
10894 * Primitive types are now hyperlinked and documented.
10895 * Documentation has been moved from static.rust-lang.org/doc to
10897 * A new sandbox, play.rust-lang.org, is available for running and
10898 sharing rust code examples on-line.
10899 * Unused attributes are now more robustly warned about.
10900 * The dead_code lint now warns about unused struct fields.
10901 * Cross-compiling to iOS is now supported.
10902 * Cross-compiling to mipsel is now supported.
10903 * Stability attributes are now inherited by default and no longer apply
10904 to intra-crate usage, only inter-crate usage.
10905 * Error message related to non-exhaustive match expressions have been
10909 Version 0.10 (2014-04-03)
10910 =========================
10912 * ~1500 changes, numerous bugfixes
10915 * A new RFC process is now in place for modifying the language.
10916 * Patterns with `@`-pointers have been removed from the language.
10917 * Patterns with unique vectors (`~[T]`) have been removed from the
10919 * Patterns with unique strings (`~str`) have been removed from the
10921 * `@str` has been removed from the language.
10922 * `@[T]` has been removed from the language.
10923 * `@self` has been removed from the language.
10924 * `@Trait` has been removed from the language.
10925 * Headers on `~` allocations which contain `@` boxes inside the type for
10926 reference counting have been removed.
10927 * The semantics around the lifetimes of temporary expressions have changed,
10928 see #3511 and #11585 for more information.
10929 * Cross-crate syntax extensions are now possible, but feature gated. See
10930 #11151 for more information. This includes both `macro_rules!` macros as
10931 well as syntax extensions such as `format!`.
10932 * New lint modes have been added, and older ones have been turned on to be
10934 * Unnecessary parentheses
10935 * Uppercase statics
10937 * Uppercase variables
10938 * Publicly visible private types
10939 * `#[deriving]` with raw pointers
10940 * Unsafe functions can no longer be coerced to closures.
10941 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10942 * The `#[simd]` attribute is now behind a feature gate.
10943 * Visibility is no longer allowed on `extern crate` statements, and
10944 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10945 * Trailing commas are now allowed in argument lists and tuple patterns.
10946 * The `do` keyword has been removed, it is now a reserved keyword.
10947 * Default type parameters have been implemented, but are feature gated.
10948 * Borrowed variables through captures in closures are now considered soundly.
10949 * `extern mod` is now `extern crate`
10950 * The `Freeze` trait has been removed.
10951 * The `Share` trait has been added for types that can be shared among
10953 * Labels in macros are now hygienic.
10954 * Expression/statement macro invocations can be delimited with `{}` now.
10955 * Treatment of types allowed in `static mut` locations has been tweaked.
10956 * The `*` and `.` operators are now overloadable through the `Deref` and
10958 * `~Trait` and `proc` no longer have `Send` bounds by default.
10959 * Partial type hints are now supported with the `_` type marker.
10960 * An `Unsafe` type was introduced for interior mutability. It is now
10961 considered undefined to transmute from `&T` to `&mut T` without using the
10963 * The #[linkage] attribute was implemented for extern statics/functions.
10964 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10965 * `Pod` was renamed to `Copy`.
10968 * The `libextra` library has been removed. It has now been decomposed into
10969 component libraries with smaller and more focused nuggets of
10970 functionality. The full list of libraries can be found on the
10971 documentation index page.
10972 * std: `std::condition` has been removed. All I/O errors are now propagated
10973 through the `Result` type. In order to assist with error handling, a
10974 `try!` macro for unwrapping errors with an early return and a lint for
10975 unused results has been added. See #12039 for more information.
10976 * std: The `vec` module has been renamed to `slice`.
10977 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10978 This will become the only growable vector in the future.
10979 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10980 are now found at `std::io::BufferedReader` instead of
10981 `std::io::buffered::BufferedReader`.
10982 * std: `print` and `println` are no longer in the prelude, the `print!` and
10983 `println!` macros are intended to be used instead.
10984 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10985 attempts to statically prevent cycles.
10986 * std: The standard distribution is adopting the policy of pushing failure
10987 to the user rather than failing in libraries. Many functions (such as
10988 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10989 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10990 deriving mode: `#[deriving(Show)]`.
10991 * std: `ToStr` is now implemented for all types implementing `Show`.
10992 * std: The formatting trait methods now take `&self` instead of `&T`
10993 * std: The `invert()` method on iterators has been renamed to `rev()`
10994 * std: `std::num` has seen a reduction in the genericity of its traits,
10995 consolidating functionality into a few core traits.
10996 * std: Backtraces are now printed on task failure if the environment
10997 variable `RUST_BACKTRACE` is present.
10998 * std: Naming conventions for iterators have been standardized. More details
10999 can be found on the wiki's style guide.
11000 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11001 still implement the function.
11002 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11003 * std: `assert_approx_eq!` has been removed
11004 * std: The `e` and `E` formatting specifiers for floats have been added to
11005 print them in exponential notation.
11006 * std: The `Times` trait has been removed
11007 * std: Indications of variance and opting out of builtin bounds is done
11008 through marker types in `std::kinds::marker` now
11009 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11010 `#[deriving(Hash)]` is now possible.
11011 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11012 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11013 * std: `Chan::new` is now `channel()`.
11014 * std: A new synchronous channel type has been implemented.
11015 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11016 * std: `hashmap` and `trie` have been moved to `libcollections`
11017 * std: `run` has been rolled into `io::process`
11018 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11019 * std: The equality and comparison traits have seen some reorganization.
11020 * std: `rand` has moved to `librand`.
11021 * std: `to_{lower,upper}case` has been implemented for `char`.
11022 * std: Logging has been moved to `liblog`.
11023 * collections: `HashMap` has been rewritten for higher performance and less
11025 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11026 it can be booted manually. The runtime guide has more information and
11028 * native: All I/O functionality except signals has been implemented.
11029 * green: Task spawning with `libgreen` has been optimized with stack caching
11030 and various trimming of code.
11031 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11032 * sync: The `extra::sync` module has been updated to modern rust (and moved
11033 to the `sync` library), tweaking and improving various interfaces while
11034 dropping redundant functionality.
11035 * sync: A new `Barrier` type has been added to the `sync` library.
11036 * sync: An efficient mutex for native and green tasks has been implemented.
11037 * serialize: The `base64` module has seen some improvement. It treats
11038 newlines better, has non-string error values, and has seen general
11040 * fourcc: A `fourcc!` macro was introduced
11041 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11042 hexadecimal literal.
11045 * `rustpkg` has been deprecated and removed from the main repository. Its
11046 replacement, `cargo`, is under development.
11047 * Nightly builds of rust are now available
11048 * The memory usage of rustc has been improved many times throughout this
11050 * The build process supports disabling rpath support for the rustc binary
11052 * Code generation has improved in some cases, giving more information to the
11053 LLVM optimization passes to enable more extensive optimizations.
11054 * Debuginfo compatibility with lldb on OSX has been restored.
11055 * The master branch is now gated on an android bot, making building for
11056 android much more reliable.
11057 * Output flags have been centralized into one `--emit` flag.
11058 * Crate type flags have been centralized into one `--crate-type` flag.
11059 * Codegen flags have been consolidated behind a `-C` flag.
11060 * Linking against outdated crates now has improved error messages.
11061 * Error messages with lifetimes will often suggest how to annotate the
11062 function to fix the error.
11063 * Many more types are documented in the standard library, and new guides
11065 * Many `rustdoc` improvements:
11066 * code blocks are syntax highlighted.
11067 * render standalone markdown files.
11068 * the --test flag tests all code blocks by default.
11069 * exported macros are displayed.
11070 * re-exported types have their documentation inlined at the location of the
11072 * search works across crates that have been rendered to the same output
11076 Version 0.9 (2014-01-09)
11077 ==========================
11079 * ~1800 changes, numerous bugfixes
11082 * The `float` type has been removed. Use `f32` or `f64` instead.
11083 * A new facility for enabling experimental features (feature gating) has
11084 been added, using the crate-level `#[feature(foo)]` attribute.
11085 * Managed boxes (@) are now behind a feature gate
11086 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11087 standard library's `Gc` or `Rc` types instead.
11088 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11089 * Jumping back to the top of a loop is now done with `continue` instead of
11091 * Strings can no longer be mutated through index assignment.
11092 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11093 hash delimiters, as in `r###"foo"###`.
11094 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11096 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11097 * `@fn`s have been removed.
11098 * `do` only works with procs in order to make it obvious what the cost
11100 * Single-element tuple-like structs can no longer be dereferenced to
11101 obtain the inner value. A more comprehensive solution for overloading
11102 the dereference operator will be provided in the future.
11103 * The `#[link(...)]` attribute has been replaced with
11104 `#[crate_id = "name#vers"]`.
11105 * Empty `impl`s must be terminated with empty braces and may not be
11106 terminated with a semicolon.
11107 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11108 no longer has any special meaning.
11109 * The old `fmt!` string formatting macro has been removed.
11110 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11111 `print!` and `println!`.
11112 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11113 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11114 `extern mod foo = "bar"` instead.
11115 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11116 * Macros can have attributes.
11117 * Macros can expand to items with attributes.
11118 * Macros can expand to multiple items.
11119 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11120 * Comments may be nested.
11121 * Values automatically coerce to trait objects they implement, without
11123 * Enum discriminants are no longer an entire word but as small as needed to
11124 contain all the variants. The `repr` attribute can be used to override
11125 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11126 `#[repr(C)]` to match C enums.
11127 * Non-string literals are not allowed in attributes (they never worked).
11128 * The FFI now supports variadic functions.
11129 * Octal numeric literals, as in `0o7777`.
11130 * The `concat!` syntax extension performs compile-time string concatenation.
11131 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11132 removed as Rust no longer uses segmented stacks.
11133 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11134 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11135 not `*`; ignoring remaining fields of a struct is also done with `..`,
11136 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11137 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11138 * `rustc` supports the "system" calling convention, which defaults to the
11139 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11141 * The `type_overflow` lint (default: warn) checks literals for overflow.
11142 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11143 * The `attribute_usage` lint (default: warn) warns about unknown
11145 * The `unknown_features` lint (default: warn) warns about unknown
11147 * The `dead_code` lint (default: warn) checks for dead code.
11148 * Rust libraries can be linked statically to one another
11149 * `#[link_args]` is behind the `link_args` feature gate.
11150 * Native libraries are now linked with `#[link(name = "foo")]`
11151 * Native libraries can be statically linked to a rust crate
11152 (`#[link(name = "foo", kind = "static")]`).
11153 * Native OS X frameworks are now officially supported
11154 (`#[link(name = "foo", kind = "framework")]`).
11155 * The `#[thread_local]` attribute creates thread-local (not task-local)
11156 variables. Currently behind the `thread_local` feature gate.
11157 * The `return` keyword may be used in closures.
11158 * Types that can be copied via a memcpy implement the `Pod` kind.
11159 * The `cfg` attribute can now be used on struct fields and enum variants.
11162 * std: The `option` and `result` API's have been overhauled to make them
11163 simpler, more consistent, and more composable.
11164 * std: The entire `std::io` module has been replaced with one that is
11165 more comprehensive and that properly interfaces with the underlying
11166 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11168 * std: `io::util` contains a number of useful implementations of
11169 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11170 `ZeroReader`, `TeeReader`.
11171 * std: The reference counted pointer type `extra::rc` moved into std.
11172 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11173 just a wrapper around it).
11174 * std: The `Either` type has been removed.
11175 * std: `fmt::Default` can be implemented for any type to provide default
11176 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11177 * std: The `rand` API continues to be tweaked.
11178 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11179 on failure in gdb, is now named `rust_fail`.
11180 * std: The `each_key` and `each_value` methods on `HashMap` have been
11181 replaced by the `keys` and `values` iterators.
11182 * std: Functions dealing with type size and alignment have moved from the
11183 `sys` module to the `mem` module.
11184 * std: The `path` module was written and API changed.
11185 * std: `str::from_utf8` has been changed to cast instead of allocate.
11186 * std: `starts_with` and `ends_with` methods added to vectors via the
11187 `ImmutableEqVector` trait, which is in the prelude.
11188 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11189 if the index is out of bounds.
11190 * std: Task failure no longer propagates between tasks, as the model was
11191 complex, expensive, and incompatible with thread-based tasks.
11192 * std: The `Any` type can be used for dynamic typing.
11193 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11195 * std: Methods that produce iterators generally do not have an `_iter`
11197 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11198 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11199 * std: `util::ignore` renamed to `prelude::drop`.
11200 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11202 * std: `vec::raw` has seen a lot of cleanup and API changes.
11203 * std: The standard library no longer includes any C++ code, and very
11204 minimal C, eliminating the dependency on libstdc++.
11205 * std: Runtime scheduling and I/O functionality has been factored out into
11206 extensible interfaces and is now implemented by two different crates:
11207 libnative, for native threading and I/O; and libgreen, for green threading
11208 and I/O. This paves the way for using the standard library in more limited
11209 embedded environments.
11210 * std: The `comm` module has been rewritten to be much faster, have a
11211 simpler, more consistent API, and to work for both native and green
11213 * std: All libuv dependencies have been moved into the rustuv crate.
11214 * native: New implementations of runtime scheduling on top of OS threads.
11215 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11217 * green: The green thread scheduler and message passing types are almost
11218 entirely lock-free.
11219 * extra: The `flatpipes` module had bitrotted and was removed.
11220 * extra: All crypto functions have been removed and Rust now has a policy of
11221 not reimplementing crypto in the standard library. In the future crypto
11222 will be provided by external crates with bindings to established libraries.
11223 * extra: `c_vec` has been modernized.
11224 * extra: The `sort` module has been removed. Use the `sort` method on
11228 * The `rust` and `rusti` commands have been removed, due to lack of
11230 * `rustdoc` was completely rewritten.
11231 * `rustdoc` can test code examples in documentation.
11232 * `rustpkg` can test packages with the argument, 'test'.
11233 * `rustpkg` supports arbitrary dependencies, including C libraries.
11234 * `rustc`'s support for generating debug info is improved again.
11235 * `rustc` has better error reporting for unbalanced delimiters.
11236 * `rustc`'s JIT support was removed due to bitrot.
11237 * Executables and static libraries can be built with LTO (-Z lto)
11238 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11242 Version 0.8 (2013-09-26)
11243 ============================
11245 * ~2200 changes, numerous bugfixes
11248 * The `for` loop syntax has changed to work with the `Iterator` trait.
11249 * At long last, unwinding works on Windows.
11250 * Default methods are ready for use.
11251 * Many trait inheritance bugs fixed.
11252 * Owned and borrowed trait objects work more reliably.
11253 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11254 * rustc can omit emission of code for the `debug!` macro if it is passed
11256 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11257 for foo.rs, then foo/mod.rs, and will generate an error when both are
11259 * Strings no longer contain trailing nulls. The new `std::c_str` module
11260 provides new mechanisms for converting to C strings.
11261 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11262 * The FFI has been overhauled such that foreign functions are called directly,
11263 instead of through a stack-switching wrapper.
11264 * Calling a foreign function must be done through a Rust function with the
11265 `#[fixed_stack_segment]` attribute.
11266 * The `externfn!` macro can be used to declare both a foreign function and
11267 a `#[fixed_stack_segment]` wrapper at once.
11268 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11269 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11270 * `priv` is disallowed everywhere except for struct fields and enum variants.
11271 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11272 * `ref` bindings in irrefutable patterns work correctly now.
11273 * `char` is now prevented from containing invalid code points.
11274 * Casting to `bool` is no longer allowed.
11275 * `\0` is now accepted as an escape in chars and strings.
11276 * `yield` is a reserved keyword.
11277 * `typeof` is a reserved keyword.
11278 * Crates may be imported by URL with `extern mod foo = "url";`.
11279 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11280 * Static vectors can be initialized with repeating elements,
11281 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11282 * Static structs can be initialized with functional record update,
11283 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11284 * `cfg!` can be used to conditionally execute code based on the crate
11285 configuration, similarly to `#[cfg(...)]`.
11286 * The `unnecessary_qualification` lint detects unneeded module
11287 prefixes (default: allow).
11288 * Arithmetic operations have been implemented on the SIMD types in
11289 `std::unstable::simd`.
11290 * Exchange allocation headers were removed, reducing memory usage.
11291 * `format!` implements a completely new, extensible, and higher-performance
11292 string formatting system. It will replace `fmt!`.
11293 * `print!` and `println!` write formatted strings (using the `format!`
11294 extension) to stdout.
11295 * `write!` and `writeln!` write formatted strings (using the `format!`
11296 extension) to the new Writers in `std::rt::io`.
11297 * The library section in which a function or static is placed may
11298 be specified with `#[link_section = "..."]`.
11299 * The `proto!` syntax extension for defining bounded message protocols
11301 * `macro_rules!` is hygienic for `let` declarations.
11302 * The `#[export_name]` attribute specifies the name of a symbol.
11303 * `unreachable!` can be used to indicate unreachable code, and fails
11307 * std: Transitioned to the new runtime, written in Rust.
11308 * std: Added an experimental I/O library, `rt::io`, based on the new
11310 * std: A new generic `range` function was added to the prelude, replacing
11311 `uint::range` and friends.
11312 * std: `range_rev` no longer exists. Since range is an iterator it can be
11313 reversed with `range(lo, hi).invert()`.
11314 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11315 renamed to `unwrap_or`.
11316 * std: The `iterator` module was renamed to `iter`.
11317 * std: Integral types now support the `checked_add`, `checked_sub`, and
11318 `checked_mul` operations for detecting overflow.
11319 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11321 * std: Methods are standardizing on conventions for casting methods:
11322 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11324 * std: The `CString` type in `c_str` provides new ways to convert to and
11326 * std: `DoubleEndedIterator` can yield elements in two directions.
11327 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11329 * std: `str::from_bytes` renamed to `str::from_utf8`.
11330 * std: `pop_opt` and `shift_opt` methods added to vectors.
11331 * std: The task-local data interface no longer uses @, and keys are
11332 no longer function pointers.
11333 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11334 * std: Added `SharedPort` to `comm`.
11335 * std: `Eq` has a default method for `ne`; only `eq` is required
11336 in implementations.
11337 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11338 is required in implementations.
11339 * std: `is_utf8` performance is improved, impacting many string functions.
11340 * std: `os::MemoryMap` provides cross-platform mmap.
11341 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11342 are not 'in-bounds' are considered undefined.
11343 * std: Many freestanding functions in `vec` removed in favor of methods.
11344 * std: Many freestanding functions on scalar types removed in favor of
11346 * std: Many options to task builders were removed since they don't make
11347 sense in the new scheduler design.
11348 * std: More containers implement `FromIterator` so can be created by the
11350 * std: More complete atomic types in `unstable::atomics`.
11351 * std: `comm::PortSet` removed.
11352 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11353 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11354 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11355 default implementations.
11356 * std: Various `from_str` functions were removed in favor of a generic
11357 `from_str` which is available in the prelude.
11358 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11359 * extra: `dlist`, the doubly-linked list was modernized.
11360 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11361 * extra: Added `glob` module, replacing `std::os::glob`.
11362 * extra: `rope` was removed.
11363 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11364 * extra: `net`, and `timer` were removed. The experimental replacements
11365 are `std::rt::io::net` and `std::rt::io::timer`.
11366 * extra: Iterators implemented for `SmallIntMap`.
11367 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11368 * extra: `SmallIntSet` removed. Use `BitvSet`.
11369 * extra: Performance of JSON parsing greatly improved.
11370 * extra: `semver` updated to SemVer 2.0.0.
11371 * extra: `term` handles more terminals correctly.
11372 * extra: `dbg` module removed.
11373 * extra: `par` module removed.
11374 * extra: `future` was cleaned up, with some method renames.
11375 * extra: Most free functions in `getopts` were converted to methods.
11378 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11379 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11380 similarly to gcc's `--march` flag.
11381 * rustc's performance compiling small crates is much better.
11382 * rustpkg has received many improvements.
11383 * rustpkg supports git tags as package IDs.
11384 * rustpkg builds into target-specific directories so it can be used for
11386 * The number of concurrent test tasks is controlled by the environment
11387 variable RUST_TEST_TASKS.
11388 * The test harness can now report metrics for benchmarks.
11389 * All tools have man pages.
11390 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11391 * The runtime uses jemalloc for allocations.
11392 * Segmented stacks are temporarily disabled as part of the transition to
11393 the new runtime. Stack overflows are possible!
11394 * A new documentation backend, rustdoc_ng, is available for use. It is
11395 still invoked through the normal `rustdoc` command.
11398 Version 0.7 (2013-07-03)
11399 =======================
11401 * ~2000 changes, numerous bugfixes
11404 * `impl`s no longer accept a visibility qualifier. Put them on methods
11406 * The borrow checker has been rewritten with flow-sensitivity, fixing
11407 many bugs and inconveniences.
11408 * The `self` parameter no longer implicitly means `&'self self`,
11409 and can be explicitly marked with a lifetime.
11410 * Overloadable compound operators (`+=`, etc.) have been temporarily
11411 removed due to bugs.
11412 * The `for` loop protocol now requires `for`-iterators to return `bool`
11413 so they compose better.
11414 * The `Durable` trait is replaced with the `'static` bounds.
11415 * Trait default methods work more often.
11416 * Structs with the `#[packed]` attribute have byte alignment and
11417 no padding between fields.
11418 * Type parameters bound by `Copy` must now be copied explicitly with
11419 the `copy` keyword.
11420 * It is now illegal to move out of a dereferenced unsafe pointer.
11421 * `Option<~T>` is now represented as a nullable pointer.
11422 * `@mut` does dynamic borrow checks correctly.
11423 * The `main` function is only detected at the topmost level of the crate.
11424 The `#[main]` attribute is still valid anywhere.
11425 * Struct fields may no longer be mutable. Use inherited mutability.
11426 * The `#[no_send]` attribute makes a type that would otherwise be
11428 * The `#[no_freeze]` attribute makes a type that would otherwise be
11430 * Unbounded recursion will abort the process after reaching the limit
11431 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11432 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11433 are never implicitly copyable.
11434 * `#[static_assert]` makes compile-time assertions about static bools.
11435 * At long last, 'argument modes' no longer exist.
11436 * The rarely used `use mod` statement no longer exists.
11438 * Syntax extensions
11439 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11441 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11442 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11443 `#[deriving(...)]`.
11444 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11445 and unsuffixed integer literals.
11448 * The `core` crate was renamed to `std`.
11449 * The `std` crate was renamed to `extra`.
11450 * More and improved documentation.
11451 * std: `iterator` module for external iterator objects.
11452 * Many old-style (internal, higher-order function) iterators replaced by
11453 implementations of `Iterator`.
11454 * std: Many old internal vector and string iterators,
11455 incl. `any`, `all`. removed.
11456 * std: The `finalize` method of `Drop` renamed to `drop`.
11457 * std: The `drop` method now takes `&mut self` instead of `&self`.
11458 * std: The prelude no longer re-exports any modules, only types and traits.
11459 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11460 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11461 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11462 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11463 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11464 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11465 * std: Many types implement `Clone`.
11466 * std: `path` type renamed to `Path`.
11467 * std: `mut` module and `Mut` type removed.
11468 * std: Many standalone functions removed in favor of methods and iterators
11469 in `vec`, `str`. In the future methods will also work as functions.
11470 * std: `reinterpret_cast` removed. Use `transmute`.
11471 * std: ascii string handling in `std::ascii`.
11472 * std: `Rand` is implemented for ~/@.
11473 * std: `run` module for spawning processes overhauled.
11474 * std: Various atomic types added to `unstable::atomic`.
11475 * std: Various types implement `Zero`.
11476 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11477 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11478 * std: Added `os::mkdir_recursive`.
11479 * std: Added `os::glob` function performs filesystems globs.
11480 * std: `FuzzyEq` renamed to `ApproxEq`.
11481 * std: `Map` now defines `pop` and `swap` methods.
11482 * std: `Cell` constructors converted to static methods.
11483 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11484 * extra: `flate` module moved from `std` to `extra`.
11485 * extra: `fileinput` module for iterating over a series of files.
11486 * extra: `Complex` number type and `complex` module.
11487 * extra: `Rational` number type and `rational` module.
11488 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11489 * extra: `term` uses terminfo now, is more correct.
11490 * extra: `arc` functions converted to methods.
11491 * extra: Implementation of fixed output size variations of SHA-2.
11494 * `unused_variables` lint mode for unused variables (default: warn).
11495 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11497 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11499 * `dead_assignment` lint mode for unread variables (default: warn).
11500 * `unnecessary_allocation` lint mode detects some heap allocations that are
11501 immediately borrowed so could be written without allocating (default: warn).
11502 * `missing_doc` lint mode (default: allow).
11503 * `unreachable_code` lint mode (default: warn).
11504 * The `rusti` command has been rewritten and a number of bugs addressed.
11505 * rustc outputs in color on more terminals.
11506 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11507 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11508 * Compiling with `-g` will make the binary record information about
11509 dynamic borrowcheck failures for debugging.
11510 * rustdoc has a nicer stylesheet.
11511 * Various improvements to rustdoc.
11512 * Improvements to rustpkg (see the detailed release notes).
11515 Version 0.6 (2013-04-03)
11516 ========================
11518 * ~2100 changes, numerous bugfixes
11521 * The self type parameter in traits is now spelled `Self`
11522 * The `self` parameter in trait and impl methods must now be explicitly
11523 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11524 * Static methods no longer require the `static` keyword and instead
11525 are distinguished by the lack of a `self` parameter
11526 * Replaced the `Durable` trait with the `'static` lifetime
11527 * The old closure type syntax with the trailing sigil has been
11528 removed in favor of the more consistent leading sigil
11529 * `super` is a keyword, and may be prefixed to paths
11530 * Trait bounds are separated with `+` instead of whitespace
11531 * Traits are implemented with `impl Trait for Type`
11532 instead of `impl Type: Trait`
11533 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11534 * The `export` keyword has finally been removed
11535 * The `move` keyword has been removed (see "Semantic changes")
11536 * The interior mutability qualifier on vectors, `[mut T]`, has been
11537 removed. Use `&mut [T]`, etc.
11538 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11539 * `fail` is no longer a keyword. Use `fail!()`
11540 * `assert` is no longer a keyword. Use `assert!()`
11541 * `log` is no longer a keyword. use `debug!`, etc.
11542 * 1-tuples may be represented as `(T,)`
11543 * Struct fields may no longer be `mut`. Use inherited mutability,
11544 `@mut T`, `core::mut` or `core::cell`
11545 * `extern mod { ... }` is no longer valid syntax for foreign
11546 function modules. Use extern blocks: `extern { ... }`
11547 * Newtype enums removed. Use tuple-structs.
11548 * Trait implementations no longer support visibility modifiers
11549 * Pattern matching over vectors improved and expanded
11550 * `const` renamed to `static` to correspond to lifetime name,
11551 and make room for future `static mut` unsafe mutable globals.
11552 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11553 * `Clone` implementations can be automatically generated with
11554 `#[deriving(Clone)]`
11555 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11556 instead of `foo as Bar`.
11557 * Fixed length vector types are now written as `[int, .. 3]`
11558 instead of `[int * 3]`.
11559 * Fixed length vector types can express the length as a constant
11560 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11563 * Types with owned pointers or custom destructors move by default,
11564 eliminating the `move` keyword
11565 * All foreign functions are considered unsafe
11566 * &mut is now unaliasable
11567 * Writes to borrowed @mut pointers are prevented dynamically
11569 * The name of the main function can be customized using #[main]
11570 * The default type of an inferred closure is &fn instead of @fn
11571 * `use` statements may no longer be "chained" - they cannot import
11572 identifiers imported by previous `use` statements
11573 * `use` statements are crate relative, importing from the "top"
11574 of the crate by default. Paths may be prefixed with `super::`
11575 or `self::` to change the search behavior.
11576 * Method visibility is inherited from the implementation declaration
11577 * Structural records have been removed
11578 * Many more types can be used in static items, including enums
11579 'static-lifetime pointers and vectors
11580 * Pattern matching over vectors improved and expanded
11581 * Typechecking of closure types has been overhauled to
11582 improve inference and eliminate unsoundness
11583 * Macros leave scope at the end of modules, unless that module is
11584 tagged with #[macro_escape]
11587 * Added big integers to `std::bigint`
11588 * Removed `core::oldcomm` module
11589 * Added pipe-based `core::comm` module
11590 * Numeric traits have been reorganized under `core::num`
11591 * `vec::slice` finally returns a slice
11592 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11593 * Containers reorganized around traits in `core::container`
11594 * `core::dvec` removed, `~[T]` is a drop-in replacement
11595 * `core::send_map` renamed to `core::hashmap`
11596 * `std::map` removed; replaced with `core::hashmap`
11597 * `std::treemap` reimplemented as an owned balanced tree
11598 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11599 * `core::trie` added as a fast ordered map for integer keys
11600 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11601 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11602 overload the comparison operators, whereas `TotalOrd` is used
11603 by certain container types
11606 * Replaced the 'cargo' package manager with 'rustpkg'
11607 * Added all-purpose 'rust' tool
11608 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11609 * rustc now *attempts* to offer spelling suggestions
11610 * Improved support for ARM and Android
11611 * Preliminary MIPS backend
11612 * Improved foreign function ABI implementation for x86, x86_64
11613 * Various memory usage improvements
11614 * Rust code may be embedded in foreign code under limited circumstances
11615 * Inline assembler supported by new asm!() syntax extension.
11618 Version 0.5 (2012-12-21)
11619 ===========================
11621 * ~900 changes, numerous bugfixes
11624 * Removed `<-` move operator
11625 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11626 * Removed old fixed length vector syntax - `[T]/N`
11627 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11628 * Macros may now expand to items and statements
11629 * `a.b()` is always parsed as a method call, never as a field projection
11630 * `Eq` and `IterBytes` implementations can be automatically generated
11631 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11632 * Removed the special crate language for `.rc` files
11633 * Function arguments may consist of any irrefutable pattern
11636 * `&` and `~` pointers may point to objects
11637 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11638 * Enum variants may be structs
11639 * Destructors can be added to all nominal types with the Drop trait
11640 * Structs and nullary enum variants may be constants
11641 * Values that cannot be implicitly copied are now automatically moved
11642 without writing `move` explicitly
11643 * `&T` may now be coerced to `*T`
11644 * Coercions happen in `let` statements as well as function calls
11645 * `use` statements now take crate-relative paths
11646 * The module and type namespaces have been merged so that static
11647 method names can be resolved under the trait in which they are
11650 * Improved support for language features
11651 * Trait inheritance works in many scenarios
11652 * More support for explicit self arguments in methods - `self`, `&self`
11653 `@self`, and `~self` all generally work as expected
11654 * Static methods work in more situations
11655 * Experimental: Traits may declare default methods for the implementations
11659 * New condition handling system in `core::condition`
11660 * Timsort added to `std::sort`
11661 * New priority queue, `std::priority_queue`
11662 * Pipes for serializable types, `std::flatpipes'
11663 * Serialization overhauled to be trait-based
11664 * Expanded `getopts` definitions
11665 * Moved futures to `std`
11666 * More functions are pure now
11667 * `core::comm` renamed to `oldcomm`. Still deprecated
11668 * `rustdoc` and `cargo` are libraries now
11671 * Added a preliminary REPL, `rusti`
11672 * License changed from MIT to dual MIT/APL2
11675 Version 0.4 (2012-10-15)
11676 ==========================
11678 * ~2000 changes, numerous bugfixes
11681 * All keywords are now strict and may not be used as identifiers anywhere
11682 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11683 'of', 'with', 'to', 'class'.
11684 * Classes are replaced with simpler structs
11685 * Explicit method self types
11686 * `ret` became `return` and `alt` became `match`
11687 * `import` is now `use`; `use is now `extern mod`
11688 * `extern mod { ... }` is now `extern { ... }`
11689 * `use mod` is the recommended way to import modules
11690 * `pub` and `priv` replace deprecated export lists
11691 * The syntax of `match` pattern arms now uses fat arrow (=>)
11692 * `main` no longer accepts an args vector; use `os::args` instead
11695 * Trait implementations are now coherent, ala Haskell typeclasses
11696 * Trait methods may be static
11697 * Argument modes are deprecated
11698 * Borrowed pointers are much more mature and recommended for use
11699 * Strings and vectors in the static region are stored in constant memory
11700 * Typestate was removed
11701 * Resolution rewritten to be more reliable
11702 * Support for 'dual-mode' data structures (freezing and thawing)
11705 * Most binary operators can now be overloaded via the traits in
11707 * `std::net::url` for representing URLs
11708 * Sendable hash maps in `core::send_map`
11709 * `core::task' gained a (currently unsafe) task-local storage API
11712 * An efficient new intertask communication primitive called the pipe,
11713 along with a number of higher-level channel types, in `core::pipes`
11714 * `std::arc`, an atomically reference counted, immutable, shared memory
11716 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11717 * Futures are now based on pipes and sendable
11718 * More robust linked task failure
11719 * Improved task builder API
11722 * Improved error reporting
11723 * Preliminary JIT support
11724 * Preliminary work on precise GC
11725 * Extensive architectural improvements to rustc
11726 * Begun a transition away from buggy C++-based reflection (shape) code to
11727 Rust-based (visitor) code
11728 * All hash functions and tables converted to secure, randomized SipHash
11731 Version 0.3 (2012-07-12)
11732 ========================
11734 * ~1900 changes, numerous bugfixes
11736 * New coding conveniences
11737 * Integer-literal suffix inference
11738 * Per-item control over warnings, errors
11739 * #[cfg(windows)] and #[cfg(unix)] attributes
11740 * Documentation comments
11741 * More compact closure syntax
11742 * 'do' expressions for treating higher-order functions as
11744 * *-patterns (wildcard extended to all constructor fields)
11747 * Name resolution pass and exhaustiveness checker rewritten
11748 * Region pointers and borrow checking supersede alias
11750 * Init-ness checking is now provided by a region-based liveness
11751 pass instead of the typestate pass; same for last-use analysis
11752 * Extensive work on region pointers
11754 * Experimental new language features
11755 * Slices and fixed-size, interior-allocated vectors
11756 * #!-comments for lang versioning, shell execution
11757 * Destructors and iface implementation for classes;
11758 type-parameterized classes and class methods
11759 * 'const' type kind for types that can be used to implement
11760 shared-memory concurrency patterns
11764 * Removal of various obsolete features
11765 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11766 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11768 * Constructs: do-while loops ('do' repurposed), fn binding,
11769 resources (replaced by destructors)
11771 * Compiler reorganization
11772 * Syntax-layer of compiler split into separate crate
11773 * Clang (from LLVM project) integrated into build
11774 * Typechecker split into sub-modules
11777 * New time functions
11778 * Extension methods for many built-in types
11779 * Arc: atomic-refcount read-only / exclusive-use shared cells
11780 * Par: parallel map and search routines
11781 * Extensive work on libuv interface
11782 * Much vector code moved to libraries
11783 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11784 #include, #include_str, #include_bin
11786 * Tool improvements
11787 * Cargo automatically resolves dependencies
11790 Version 0.2 (2012-03-29)
11791 =========================
11793 * >1500 changes, numerous bugfixes
11795 * New docs and doc tooling
11797 * New port: FreeBSD x86_64
11799 * Compilation model enhancements
11800 * Generics now specialized, multiply instantiated
11801 * Functions now inlined across separate crates
11803 * Scheduling, stack and threading fixes
11804 * Noticeably improved message-passing performance
11805 * Explicit schedulers
11809 * Experimental new language features
11810 * Operator overloading
11814 * Various language extensions
11815 * C-callback function types: 'crust fn ...'
11816 * Infinite-loop construct: 'loop { ... }'
11817 * Shorten 'mutable' to 'mut'
11818 * Required mutable-local qualifier: 'let mut ...'
11819 * Basic glob-exporting: 'export foo::*;'
11820 * Alt now exhaustive, 'alt check' for runtime-checked
11821 * Block-function form of 'for' loop, with 'break' and 'ret'.
11824 * AST quasi-quote syntax extension
11825 * Revived libuv interface
11826 * New modules: core::{future, iter}, std::arena
11827 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11828 * Extensive cleanup, regularization in libstd, libcore
11831 Version 0.1 (2012-01-20)
11832 ===============================
11834 * Most language features work, including:
11835 * Unique pointers, unique closures, move semantics
11836 * Interface-constrained generics
11837 * Static interface dispatch
11839 * Multithread task scheduling
11840 * Typestate predicates
11841 * Failure unwinding, destructors
11842 * Pattern matching and destructuring assignment
11843 * Lightweight block-lambda syntax
11844 * Preliminary macro-by-example
11846 * Compiler works with the following configurations:
11847 * Linux: x86 and x86_64 hosts and targets
11848 * macOS: x86 and x86_64 hosts and targets
11849 * Windows: x86 hosts and targets
11851 * Cross compilation / multi-target configuration supported.
11853 * Preliminary API-documentation and package-management tools included.
11857 * Documentation is incomplete.
11859 * Performance is below intended target.
11861 * Standard library APIs are subject to extensive change, reorganization.
11863 * Language-level versioning is not yet operational - future code will
11864 break unexpectedly.