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 - [Enforce that layout size fits in isize in Layout](https://github.com/rust-lang/rust/pull/95295/)
24 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
25 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
26 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
27 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
28 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
29 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
34 - [`ffi::CStr`](https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html)
35 - [`ffi::CString`](https://doc.rust-lang.org/stable/std/ffi/struct.CString.html)
36 - [`ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesWithNulError.html)
37 - [`ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/std/ffi/struct.FromVecWithNulError.html)
38 - [`ffi::IntoStringError`](https://doc.rust-lang.org/stable/std/ffi/struct.IntoStringError.html)
39 - [`ffi::NulError`](https://doc.rust-lang.org/stable/std/ffi/struct.NulError.html)
40 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
41 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
42 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
43 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
44 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
45 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
46 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
47 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
48 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
49 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
50 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
51 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
52 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
53 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
54 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
55 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
56 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
57 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
58 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
59 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
60 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
61 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
62 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
63 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
64 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
65 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
66 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
67 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
68 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
69 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
70 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
71 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
73 These APIs are now usable in const contexts:
75 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
79 - [Packages can now inherit settings from the workspace so that the settings
80 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
81 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
83 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
84 for more details on how to define these common settings.
85 - [Cargo commands can now accept multiple `--target` flags to build for
86 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
87 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
88 config option may now take an array of multiple targets.
89 - [The `--jobs` argument can now take a negative number to count backwards from
90 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
91 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
92 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
93 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
94 flag to `cargo rustc` to override the crate type.
95 - [Significantly improved the performance fetching git dependencies from GitHub
96 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
100 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
104 - 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/)
105 - [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.
106 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
107 - [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.
108 - [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.
109 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
110 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
111 - 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/).
112 - [`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.
117 These changes do not affect any public interfaces of Rust, but they represent
118 significant improvements to the performance or internals of rustc and related
121 - 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/)
122 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
123 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
124 - Many improvements to generated code for derives, including performance improvements:
125 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
126 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
127 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
128 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
129 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
130 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
131 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
132 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
133 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
134 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
135 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
137 Version 1.63.0 (2022-08-11)
138 ==========================
142 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
143 - [Modify MIR building to drop repeat expressions with length zero.][95953]
144 - [Remove label/lifetime shadowing warnings.][96296]
145 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
146 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
147 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
148 - [lub: don't bail out due to empty binders.][97867]
152 - [Stabilize the `bundle` native library modifier,][95818] also removing the
153 deprecated `static-nobundle` linking kind.
154 - [Add Apple WatchOS compile targets\*.][95243]
155 - [Add a Windows application manifest to rustc-main.][96737]
157 \* Refer to Rust's [platform support page][platform-support-doc] for more
158 information on Rust's tiered platform support.
162 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
163 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
164 - [`impl Read and Write for VecDeque<u8>`.][95632]
165 - [STD support for the Nintendo 3DS.][95897]
166 - [Use rounding in float to Duration conversion methods.][96051]
167 - [Make write/print macros eagerly drop temporaries.][96455]
168 - [Implement internal traits that enable `[OsStr]::join`.][96881]
169 - [Implement `Hash` for `core::alloc::Layout`.][97034]
170 - [Add capacity documentation for `OsString`.][97202]
171 - [Put a bound on collection misbehavior.][97316]
172 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
173 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
174 - [Document Rust's stance on `/proc/self/mem`.][97837]
181 - [`BinaryHeap::try_reserve`]
182 - [`BinaryHeap::try_reserve_exact`]
183 - [`OsString::try_reserve`]
184 - [`OsString::try_reserve_exact`]
185 - [`PathBuf::try_reserve`]
186 - [`PathBuf::try_reserve_exact`]
187 - [`Path::try_exists`]
188 - [`Ref::filter_map`]
189 - [`RefMut::filter_map`]
190 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
191 - [`ToOwned::clone_into`]
192 - [`Ipv6Addr::to_ipv4_mapped`]
194 - [`unix::io::BorrowedFd<'fd>`]
195 - [`unix::io::OwnedFd`]
196 - [`windows::io::AsHandle`]
197 - [`windows::io::BorrowedHandle<'handle>`]
198 - [`windows::io::OwnedHandle`]
199 - [`windows::io::HandleOrInvalid`]
200 - [`windows::io::HandleOrNull`]
201 - [`windows::io::InvalidHandleError`]
202 - [`windows::io::NullHandleError`]
203 - [`windows::io::AsSocket`]
204 - [`windows::io::BorrowedSocket<'handle>`]
205 - [`windows::io::OwnedSocket`]
208 - [`thread::ScopedJoinHandle`]
210 These APIs are now usable in const contexts:
212 - [`array::from_ref`]
213 - [`slice::from_ref`]
214 - [`intrinsics::copy`]
215 - [`intrinsics::copy_nonoverlapping`]
216 - [`<*const T>::copy_to`]
217 - [`<*const T>::copy_to_nonoverlapping`]
218 - [`<*mut T>::copy_to`]
219 - [`<*mut T>::copy_to_nonoverlapping`]
220 - [`<*mut T>::copy_from`]
221 - [`<*mut T>::copy_from_nonoverlapping`]
223 - [`Utf8Error::error_len`]
224 - [`Utf8Error::valid_up_to`]
231 - [Stabilize the `--config path` command-line argument.][cargo/10755]
232 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
237 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
238 errors for invalid attribute arguments that were previously ignored.
239 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
240 duration can differ slightly from what it was.
245 These changes provide no direct user facing benefits, but represent significant
246 improvements to the internals and overall performance of rustc
249 - [Prepare Rust for LLVM opaque pointers.][94214]
251 [94214]: https://github.com/rust-lang/rust/pull/94214/
252 [94530]: https://github.com/rust-lang/rust/pull/94530/
253 [94954]: https://github.com/rust-lang/rust/pull/94954/
254 [95243]: https://github.com/rust-lang/rust/pull/95243/
255 [95565]: https://github.com/rust-lang/rust/pull/95565/
256 [95632]: https://github.com/rust-lang/rust/pull/95632/
257 [95818]: https://github.com/rust-lang/rust/pull/95818/
258 [95897]: https://github.com/rust-lang/rust/pull/95897/
259 [95953]: https://github.com/rust-lang/rust/pull/95953/
260 [96051]: https://github.com/rust-lang/rust/pull/96051/
261 [96296]: https://github.com/rust-lang/rust/pull/96296/
262 [96455]: https://github.com/rust-lang/rust/pull/96455/
263 [96737]: https://github.com/rust-lang/rust/pull/96737/
264 [96868]: https://github.com/rust-lang/rust/pull/96868/
265 [96881]: https://github.com/rust-lang/rust/pull/96881/
266 [96885]: https://github.com/rust-lang/rust/pull/96885/
267 [96959]: https://github.com/rust-lang/rust/pull/96959/
268 [97034]: https://github.com/rust-lang/rust/pull/97034/
269 [97202]: https://github.com/rust-lang/rust/pull/97202/
270 [97316]: https://github.com/rust-lang/rust/pull/97316/
271 [97652]: https://github.com/rust-lang/rust/pull/97652/
272 [97675]: https://github.com/rust-lang/rust/pull/97675/
273 [97803]: https://github.com/rust-lang/rust/pull/97803/
274 [97837]: https://github.com/rust-lang/rust/pull/97837/
275 [97867]: https://github.com/rust-lang/rust/pull/97867/
276 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
277 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
279 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
280 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
281 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
282 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
283 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
284 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
285 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
286 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
287 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
288 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
289 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
290 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
291 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
292 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
293 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
294 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
295 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
296 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
297 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
298 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
299 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
300 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
301 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
302 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
303 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
304 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
305 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
306 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
307 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
308 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
310 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
311 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
312 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
313 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
314 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
315 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
316 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
317 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
318 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
319 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
320 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
321 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
322 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
323 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
324 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
325 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
327 Version 1.62.1 (2022-07-19)
328 ==========================
330 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
331 library, and also mitigates a CPU vulnerability on Intel SGX.
333 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
334 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
335 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
336 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
337 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
339 [98608]: https://github.com/rust-lang/rust/issues/98608
340 [98890]: https://github.com/rust-lang/rust/issues/98890
341 [98950]: https://github.com/rust-lang/rust/pull/98950
342 [98126]: https://github.com/rust-lang/rust/pull/98126
343 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
345 Version 1.62.0 (2022-06-30)
346 ==========================
351 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
352 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
353 - [Fix constants not getting dropped if part of a diverging expression][94775]
354 - [Support unit struct/enum variant in destructuring assignment][95380]
355 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
356 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
361 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
362 - [Make `unaligned_references` lint deny-by-default][95372]
363 This lint is also a future compatibility lint, and is expected to eventually
365 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
366 - [Reject `#[thread_local]` attribute on non-static items][95006]
367 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
368 - [Implement a lint to warn about unused macro rules][96150]
369 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
371 \* Refer to Rust's [platform support page][platform-support-doc] for more
372 information on Rust's tiered platform support.
377 - [Windows: Use a pipe relay for chaining pipes][95841]
378 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
379 - [Replace RwLock by a futex based one on Linux][95801]
380 - [std: directly use pthread in UNIX parker implementation][96393]
385 - [`bool::then_some`]
389 - [`windows::CommandExt::raw_arg`]
390 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
391 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
392 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
393 - [`FusedIterator for EncodeWide`]
394 - [RDM intrinsics on aarch64][stdarch/1285]
399 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
404 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
406 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
407 - Package ID specs now support `name@version` syntax in addition to the
408 previous `name:version` to align with the behavior in `cargo add` and other
409 tools. `cargo install` and `cargo yank` also now support this syntax so the
410 version does not need to passed as a separate flag.
411 - The `git` and `registry` directories in Cargo's home directory (usually
412 `~/.cargo`) are now marked as cache directories so that they are not
413 included in backups or content indexing (on Windows).
414 - Added automatic `@` argfile support, which will use "response files" if the
415 command-line to `rustc` exceeds the operating system's limit.
420 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
421 the same as the host target.
422 [#10594](https://github.com/rust-lang/cargo/pull/10594)
423 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
424 - [rustdoc: Remove .woff font files][96279]
425 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
426 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
427 complete synchronously][95469].
432 - [Unify ReentrantMutex implementations across all platforms][96042]
434 These changes provide no direct user facing benefits, but represent significant
435 improvements to the internals and overall performance of rustc
438 [93313]: https://github.com/rust-lang/rust/pull/93313/
439 [93969]: https://github.com/rust-lang/rust/pull/93969/
440 [94206]: https://github.com/rust-lang/rust/pull/94206/
441 [94457]: https://github.com/rust-lang/rust/pull/94457/
442 [94775]: https://github.com/rust-lang/rust/pull/94775/
443 [94872]: https://github.com/rust-lang/rust/pull/94872/
444 [95006]: https://github.com/rust-lang/rust/pull/95006/
445 [95035]: https://github.com/rust-lang/rust/pull/95035/
446 [95346]: https://github.com/rust-lang/rust/pull/95346/
447 [95372]: https://github.com/rust-lang/rust/pull/95372/
448 [95380]: https://github.com/rust-lang/rust/pull/95380/
449 [95431]: https://github.com/rust-lang/rust/pull/95431/
450 [95469]: https://github.com/rust-lang/rust/pull/95469/
451 [95705]: https://github.com/rust-lang/rust/pull/95705/
452 [95801]: https://github.com/rust-lang/rust/pull/95801/
453 [95819]: https://github.com/rust-lang/rust/pull/95819/
454 [95841]: https://github.com/rust-lang/rust/pull/95841/
455 [96042]: https://github.com/rust-lang/rust/pull/96042/
456 [96150]: https://github.com/rust-lang/rust/pull/96150/
457 [96268]: https://github.com/rust-lang/rust/pull/96268/
458 [96279]: https://github.com/rust-lang/rust/pull/96279/
459 [96393]: https://github.com/rust-lang/rust/pull/96393/
460 [96436]: https://github.com/rust-lang/rust/pull/96436/
461 [96557]: https://github.com/rust-lang/rust/pull/96557/
462 [96630]: https://github.com/rust-lang/rust/pull/96630/
464 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
465 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
466 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
467 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
468 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
469 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
470 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
471 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
472 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
473 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
475 Version 1.61.0 (2022-05-19)
476 ==========================
481 - [`const fn` signatures can now include generic trait bounds][93827]
482 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
483 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
484 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
489 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
490 - [The `char` type is now described as UTF-32 in debuginfo][89887]
491 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
492 - X86 [`#[target_feature = "adx"]` is now stable][93745]
497 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
498 - [`#[ignore = "…"]` messages are printed when running tests][92714]
499 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
500 - [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.
501 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
502 - [`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.
507 - [`Pin::static_mut`]
508 - [`Pin::static_ref`]
509 - [`Vec::retain_mut`]
510 - [`VecDeque::retain_mut`]
511 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
512 - [`std::os::unix::net::SocketAddr::from_pathname`]
513 - [`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.
514 - [`std::thread::JoinHandle::is_finished`]
516 These APIs are now usable in const contexts:
518 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
519 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
520 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
521 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
522 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
523 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
524 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
525 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
526 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
531 No feature changes, but see compatibility notes.
536 - 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
537 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
538 - (less common) or be updated to use the [`+whole-archive`] modifier.
539 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
540 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
541 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
542 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
543 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
544 - [`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`.
545 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
550 These changes provide no direct user facing benefits, but represent significant
551 improvements to the internals and overall performance of rustc
554 - [debuginfo: Refactor debuginfo generation for types][94261]
555 - [Remove the everybody loops pass][93913]
557 [88375]: https://github.com/rust-lang/rust/pull/88375/
558 [89887]: https://github.com/rust-lang/rust/pull/89887/
559 [90621]: https://github.com/rust-lang/rust/pull/90621/
560 [92285]: https://github.com/rust-lang/rust/pull/92285/
561 [92472]: https://github.com/rust-lang/rust/pull/92472/
562 [92697]: https://github.com/rust-lang/rust/pull/92697/
563 [92714]: https://github.com/rust-lang/rust/pull/92714/
564 [92911]: https://github.com/rust-lang/rust/pull/92911/
565 [93263]: https://github.com/rust-lang/rust/pull/93263/
566 [93745]: https://github.com/rust-lang/rust/pull/93745/
567 [93827]: https://github.com/rust-lang/rust/pull/93827/
568 [93901]: https://github.com/rust-lang/rust/pull/93901/
569 [93913]: https://github.com/rust-lang/rust/pull/93913/
570 [93965]: https://github.com/rust-lang/rust/pull/93965/
571 [94081]: https://github.com/rust-lang/rust/pull/94081/
572 [94261]: https://github.com/rust-lang/rust/pull/94261/
573 [94295]: https://github.com/rust-lang/rust/pull/94295/
574 [94832]: https://github.com/rust-lang/rust/pull/94832/
575 [95016]: https://github.com/rust-lang/rust/pull/95016/
576 [95251]: https://github.com/rust-lang/rust/pull/95251/
577 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
578 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
579 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
580 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
581 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
582 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
583 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
584 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
585 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
586 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
587 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
588 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
589 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
590 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
591 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
592 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
593 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
594 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
595 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
596 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
597 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
598 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
601 Version 1.60.0 (2022-04-07)
602 ==========================
606 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
607 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
611 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
612 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
613 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
614 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
615 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
616 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
617 - [Fix invalid removal of newlines from doc comments][92357]
618 - [Add kernel target for RustyHermit][92670]
619 - [Deny mixing bin crate type with lib crate types][92933]
620 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
621 - [Upgrade to LLVM 14][93577]
623 \* Refer to Rust's [platform support page][platform-support-doc] for more
624 information on Rust's tiered platform support.
628 - [Guarantee call order for `sort_by_cached_key`][89621]
629 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
630 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
631 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
632 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
636 - [`Arc::new_cyclic`][arc_new_cyclic]
637 - [`Rc::new_cyclic`][rc_new_cyclic]
638 - [`slice::EscapeAscii`][slice_escape_ascii]
639 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
640 - [`u8::escape_ascii`][u8_escape_ascii]
641 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
642 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
643 - [`MaybeUninit::assume_init_read`][assume_init_read]
644 - [`i8::abs_diff`][i8_abs_diff]
645 - [`i16::abs_diff`][i16_abs_diff]
646 - [`i32::abs_diff`][i32_abs_diff]
647 - [`i64::abs_diff`][i64_abs_diff]
648 - [`i128::abs_diff`][i128_abs_diff]
649 - [`isize::abs_diff`][isize_abs_diff]
650 - [`u8::abs_diff`][u8_abs_diff]
651 - [`u16::abs_diff`][u16_abs_diff]
652 - [`u32::abs_diff`][u32_abs_diff]
653 - [`u64::abs_diff`][u64_abs_diff]
654 - [`u128::abs_diff`][u128_abs_diff]
655 - [`usize::abs_diff`][usize_abs_diff]
656 - [`Display for io::ErrorKind`][display_error_kind]
657 - [`From<u8> for ExitCode`][from_u8_exit_code]
658 - [`Not for !` (the "never" type)][not_never]
659 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
660 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
664 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
665 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
666 - [Stabilize namespaced and weak dependency features.][cargo/10269]
667 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
668 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
672 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
673 - [Drop rustc-docs from complete profile][93742]
674 - [bootstrap: tidy up flag handling for llvm build][93918]
678 - [Remove compiler-rt linking hack on Android][83822]
679 - [Mitigations for platforms with non-monotonic clocks have been removed from
680 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
681 instant is not guaranteed to be greater than an earlier instant anymore.
682 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
683 saturating to `0` instead][89926]. In the real world the panic happened mostly
684 on platforms with buggy monotonic clock implementations rather than catching
685 programming errors like reversing the start and end times. Such programming
686 errors will now results in `0` rather than a panic.
687 - In a future release we're planning to increase the baseline requirements for
688 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
689 your feedback in [PR #95026][95026].
694 These changes provide no direct user facing benefits, but represent significant
695 improvements to the internals and overall performance of rustc
698 - [Switch all libraries to the 2021 edition][92068]
700 [83822]: https://github.com/rust-lang/rust/pull/83822
701 [86374]: https://github.com/rust-lang/rust/pull/86374
702 [87487]: https://github.com/rust-lang/rust/pull/87487
703 [89621]: https://github.com/rust-lang/rust/pull/89621
704 [89926]: https://github.com/rust-lang/rust/pull/89926
705 [90132]: https://github.com/rust-lang/rust/pull/90132
706 [90247]: https://github.com/rust-lang/rust/pull/90247
707 [91606]: https://github.com/rust-lang/rust/pull/91606
708 [92068]: https://github.com/rust-lang/rust/pull/92068
709 [92300]: https://github.com/rust-lang/rust/pull/92300
710 [92357]: https://github.com/rust-lang/rust/pull/92357
711 [92383]: https://github.com/rust-lang/rust/pull/92383
712 [92630]: https://github.com/rust-lang/rust/pull/92630
713 [92670]: https://github.com/rust-lang/rust/pull/92670
714 [92800]: https://github.com/rust-lang/rust/pull/92800
715 [92933]: https://github.com/rust-lang/rust/pull/92933
716 [93566]: https://github.com/rust-lang/rust/pull/93566
717 [93577]: https://github.com/rust-lang/rust/pull/93577
718 [93658]: https://github.com/rust-lang/rust/pull/93658
719 [93742]: https://github.com/rust-lang/rust/pull/93742
720 [93824]: https://github.com/rust-lang/rust/pull/93824
721 [93918]: https://github.com/rust-lang/rust/pull/93918
722 [95026]: https://github.com/rust-lang/rust/pull/95026
724 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
725 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
726 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
727 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
728 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
730 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
731 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
732 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
733 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
734 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
735 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
736 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
737 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
738 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
739 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
740 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
741 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
742 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
743 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
744 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
745 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
746 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
747 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
748 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
749 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
750 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
751 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
752 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
753 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
754 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
756 Version 1.59.0 (2022-02-24)
757 ==========================
762 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
763 - [Stabilize destructuring assignment][90521]
764 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
765 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
770 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
771 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
772 - [Fix sparc64 ABI for aggregates with floating point members][91003]
773 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
774 - [Add support for riscv64gc-unknown-freebsd][91284]
775 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
776 - [Soft disable incremental compilation][94124]
778 This release disables incremental compilation, unless the user has explicitly
779 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
780 This is due to a known and relatively frequently occurring bug in incremental
781 compilation, which causes builds to issue internal compiler errors. This
782 particular bug is already fixed on nightly, but that fix has not yet rolled out
783 to stable and is deemed too risky for a direct stable backport.
785 As always, we encourage users to test with nightly and report bugs so that we
786 can track failures and fix issues earlier.
788 See [94124] for more details.
790 [94124]: https://github.com/rust-lang/rust/issues/94124
795 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
800 - [`std::thread::available_parallelism`][available_parallelism]
801 - [`Result::copied`][result-copied]
802 - [`Result::cloned`][result-cloned]
803 - [`arch::asm!`][asm]
804 - [`arch::global_asm!`][global_asm]
805 - [`ops::ControlFlow::is_break`][is_break]
806 - [`ops::ControlFlow::is_continue`][is_continue]
807 - [`TryFrom<char> for u8`][try_from_char_u8]
808 - [`char::TryFromCharError`][try_from_char_err]
809 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
811 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
812 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
813 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
814 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
815 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
816 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
817 - [`DoubleEndedIterator for ToLowercase`][lowercase]
818 - [`DoubleEndedIterator for ToUppercase`][uppercase]
819 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
820 - [`UnwindSafe for Once`][unwindsafe_once]
821 - [`RefUnwindSafe for Once`][refunwindsafe_once]
822 - [armv8 neon intrinsics for aarch64][stdarch/1266]
826 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
827 - [`mem::MaybeUninit::assume_init`][muninit_init]
828 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
829 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
834 - [Stabilize the `strip` profile option][cargo/10088]
835 - [Stabilize future-incompat-report][cargo/10165]
836 - [Support abbreviating `--release` as `-r`][cargo/10133]
837 - [Support `term.quiet` configuration][cargo/10152]
838 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
843 - [Refactor weak symbols in std::sys::unix][90846]
844 This may add new, versioned, symbols when building with a newer glibc, as the
845 standard library uses weak linkage rather than dynamically attempting to load
846 certain symbols at runtime.
847 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
848 This adds a future compatibility lint to supporting the use of cfg_attr
849 wrapping either crate_type or crate_name specification within Rust files;
850 it is recommended that users migrate to setting the equivalent command line
852 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
853 This may expose new names, leading to conflicts with preexisting names in a
854 given namespace and a compilation failure.
855 - [Cargo will document libraries before binaries.][cargo/10172]
856 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
857 - [Weaken guarantee around advancing underlying iterators in zip][83791]
858 - [Make split_inclusive() on an empty slice yield an empty output][89825]
859 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
860 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
865 These changes provide no direct user facing benefits, but represent significant
866 improvements to the internals and overall performance of rustc
869 - [Fix many cases of normalization-related ICEs][91255]
870 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
871 - [Store liveness in interval sets for region inference][90637]
873 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
874 unstable feature.][91867]
876 [91867]: https://github.com/rust-lang/rust/issues/91867
877 [83744]: https://github.com/rust-lang/rust/pull/83744/
878 [83791]: https://github.com/rust-lang/rust/pull/83791/
879 [85013]: https://github.com/rust-lang/rust/pull/85013/
880 [89825]: https://github.com/rust-lang/rust/pull/89825/
881 [89999]: https://github.com/rust-lang/rust/pull/89999/
882 [90128]: https://github.com/rust-lang/rust/pull/90128/
883 [90207]: https://github.com/rust-lang/rust/pull/90207/
884 [90521]: https://github.com/rust-lang/rust/pull/90521/
885 [90586]: https://github.com/rust-lang/rust/pull/90586/
886 [90637]: https://github.com/rust-lang/rust/pull/90637/
887 [90833]: https://github.com/rust-lang/rust/pull/90833/
888 [90846]: https://github.com/rust-lang/rust/pull/90846/
889 [91003]: https://github.com/rust-lang/rust/pull/91003/
890 [91172]: https://github.com/rust-lang/rust/pull/91172/
891 [91255]: https://github.com/rust-lang/rust/pull/91255/
892 [91284]: https://github.com/rust-lang/rust/pull/91284/
893 [91535]: https://github.com/rust-lang/rust/pull/91535/
894 [91593]: https://github.com/rust-lang/rust/pull/91593/
895 [91728]: https://github.com/rust-lang/rust/pull/91728/
896 [91878]: https://github.com/rust-lang/rust/pull/91878/
897 [91896]: https://github.com/rust-lang/rust/pull/91896/
898 [91926]: https://github.com/rust-lang/rust/pull/91926/
899 [91984]: https://github.com/rust-lang/rust/pull/91984/
900 [92020]: https://github.com/rust-lang/rust/pull/92020/
901 [92034]: https://github.com/rust-lang/rust/pull/92034/
902 [92137]: https://github.com/rust-lang/rust/pull/92137/
903 [92483]: https://github.com/rust-lang/rust/pull/92483/
904 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
905 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
906 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
907 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
908 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
909 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
910 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
911 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
913 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
914 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
915 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
916 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
917 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
918 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
919 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
920 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
921 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
922 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
923 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
924 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
925 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
926 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
927 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
928 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
929 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
930 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
931 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
932 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
933 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
934 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
935 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
936 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
937 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
938 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
940 Version 1.58.1 (2022-01-19)
941 ===========================
943 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
944 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
945 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
946 * [Fix wrong error message displayed when some imports are missing][91254]
947 * [Fix rustfmt not formatting generated files from stdin][92912]
949 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
950 [91254]: https://github.com/rust-lang/rust/pull/91254
951 [92912]: https://github.com/rust-lang/rust/pull/92912
952 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
953 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
955 Version 1.58.0 (2022-01-13)
956 ==========================
961 - [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.
962 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
963 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
968 - [Add LLVM CFI support to the Rust compiler][89652]
969 - [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.
970 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
971 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
972 - [Update the minimum external LLVM to 12][90175]
973 - [Add `x86_64-unknown-none` at Tier 3*][89062]
974 - [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.
975 - [Don't abort compilation after giving a lint error][87337]
976 - [Error messages point at the source of trait bound obligations in more places][89580]
978 \* Refer to Rust's [platform support page][platform-support-doc] for more
979 information on Rust's tiered platform support.
984 - [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.
985 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
986 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
987 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
988 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
989 - [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).
994 - [`Metadata::is_symlink`]
995 - [`Path::is_symlink`]
996 - [`{integer}::saturating_div`]
997 - [`Option::unwrap_unchecked`]
998 - [`Result::unwrap_unchecked`]
999 - [`Result::unwrap_err_unchecked`]
1002 These APIs are now usable in const contexts:
1005 - [`Duration::checked_add`]
1006 - [`Duration::saturating_add`]
1007 - [`Duration::checked_sub`]
1008 - [`Duration::saturating_sub`]
1009 - [`Duration::checked_mul`]
1010 - [`Duration::saturating_mul`]
1011 - [`Duration::checked_div`]
1016 - [Add --message-format for install command][cargo/10107]
1017 - [Warn when alias shadows external subcommand][cargo/10082]
1022 - [Show all Deref implementations recursively in rustdoc][90183]
1023 - [Use computed visibility in rustdoc][88447]
1028 - [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.
1029 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1030 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1031 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1032 - [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.
1033 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1038 These changes provide no direct user facing benefits, but represent significant
1039 improvements to the internals and overall performance of rustc
1042 - [Implement coherence checks for negative trait impls][90104]
1043 - [Add rustc lint, warning when iterating over hashmaps][89558]
1044 - [Optimize live point computation][90491]
1045 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1046 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1048 [87337]: https://github.com/rust-lang/rust/pull/87337/
1049 [87467]: https://github.com/rust-lang/rust/pull/87467/
1050 [87704]: https://github.com/rust-lang/rust/pull/87704/
1051 [88041]: https://github.com/rust-lang/rust/pull/88041/
1052 [88447]: https://github.com/rust-lang/rust/pull/88447/
1053 [88601]: https://github.com/rust-lang/rust/pull/88601/
1054 [89062]: https://github.com/rust-lang/rust/pull/89062/
1055 [89174]: https://github.com/rust-lang/rust/pull/89174/
1056 [89551]: https://github.com/rust-lang/rust/pull/89551/
1057 [89558]: https://github.com/rust-lang/rust/pull/89558/
1058 [89580]: https://github.com/rust-lang/rust/pull/89580/
1059 [89652]: https://github.com/rust-lang/rust/pull/89652/
1060 [90041]: https://github.com/rust-lang/rust/pull/90041/
1061 [90058]: https://github.com/rust-lang/rust/pull/90058/
1062 [90104]: https://github.com/rust-lang/rust/pull/90104/
1063 [90117]: https://github.com/rust-lang/rust/pull/90117/
1064 [90175]: https://github.com/rust-lang/rust/pull/90175/
1065 [90183]: https://github.com/rust-lang/rust/pull/90183/
1066 [90297]: https://github.com/rust-lang/rust/pull/90297/
1067 [90329]: https://github.com/rust-lang/rust/pull/90329/
1068 [90361]: https://github.com/rust-lang/rust/pull/90361/
1069 [90417]: https://github.com/rust-lang/rust/pull/90417/
1070 [90473]: https://github.com/rust-lang/rust/pull/90473/
1071 [90491]: https://github.com/rust-lang/rust/pull/90491/
1072 [90733]: https://github.com/rust-lang/rust/pull/90733/
1073 [90833]: https://github.com/rust-lang/rust/pull/90833/
1074 [90846]: https://github.com/rust-lang/rust/pull/90846/
1075 [91026]: https://github.com/rust-lang/rust/pull/91026/
1076 [91207]: https://github.com/rust-lang/rust/pull/91207/
1077 [91255]: https://github.com/rust-lang/rust/pull/91255/
1078 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1079 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1080 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1081 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1082 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1083 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1084 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1085 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1086 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1087 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1089 Version 1.57.0 (2021-12-02)
1090 ==========================
1095 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1096 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1097 - [Allow panicking in constant evaluation.][89508]
1098 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1103 - [Create more accurate debuginfo for vtables.][89597]
1104 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1105 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1106 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1107 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1109 \* Refer to Rust's [platform support page][platform-support-doc] for more
1110 information on Rust's tiered platform support.
1115 - [Avoid allocations and copying in `Vec::leak`][89337]
1116 - [Add `#[repr(i8)]` to `Ordering`][89507]
1117 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1118 - [Update to Unicode 14.0][89614]
1119 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1120 when ignoring their return value. This helps catch mistakes such as expecting
1121 a function to mutate a value in place rather than return a new value.
1126 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1127 - [`[T; N]::as_slice`][`array::as_slice`]
1128 - [`collections::TryReserveError`]
1129 - [`HashMap::try_reserve`]
1130 - [`HashSet::try_reserve`]
1131 - [`String::try_reserve`]
1132 - [`String::try_reserve_exact`]
1133 - [`Vec::try_reserve`]
1134 - [`Vec::try_reserve_exact`]
1135 - [`VecDeque::try_reserve`]
1136 - [`VecDeque::try_reserve_exact`]
1137 - [`Iterator::map_while`]
1138 - [`iter::MapWhile`]
1139 - [`proc_macro::is_available`]
1140 - [`Command::get_program`]
1141 - [`Command::get_args`]
1142 - [`Command::get_envs`]
1143 - [`Command::get_current_dir`]
1147 These APIs are now usable in const contexts:
1149 - [`hint::unreachable_unchecked`]
1154 - [Stabilize custom profiles][cargo/9943]
1159 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1160 This will break some builds that set `#![deny(dead_code)]`.
1164 These changes provide no direct user facing benefits, but represent significant
1165 improvements to the internals and overall performance of rustc
1168 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1170 [85200]: https://github.com/rust-lang/rust/pull/85200/
1171 [86191]: https://github.com/rust-lang/rust/pull/86191/
1172 [87220]: https://github.com/rust-lang/rust/pull/87220/
1173 [87260]: https://github.com/rust-lang/rust/pull/87260/
1174 [88321]: https://github.com/rust-lang/rust/pull/88321/
1175 [88529]: https://github.com/rust-lang/rust/pull/88529/
1176 [88690]: https://github.com/rust-lang/rust/pull/88690/
1177 [88952]: https://github.com/rust-lang/rust/pull/88952/
1178 [89337]: https://github.com/rust-lang/rust/pull/89337/
1179 [89507]: https://github.com/rust-lang/rust/pull/89507/
1180 [89508]: https://github.com/rust-lang/rust/pull/89508/
1181 [89582]: https://github.com/rust-lang/rust/pull/89582/
1182 [89597]: https://github.com/rust-lang/rust/pull/89597/
1183 [89614]: https://github.com/rust-lang/rust/pull/89614/
1184 [89692]: https://github.com/rust-lang/rust/issues/89692/
1185 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1186 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1187 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1188 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1189 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1190 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1191 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1192 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1193 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1194 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1195 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1196 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1197 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1198 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1199 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1200 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1201 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1202 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1203 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1204 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1205 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1207 Version 1.56.1 (2021-11-01)
1208 ===========================
1210 - New lints to detect the presence of bidirectional-override Unicode
1211 codepoints in the compiled source code ([CVE-2021-42574])
1213 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1215 Version 1.56.0 (2021-10-21)
1216 ========================
1221 - [The 2021 Edition is now stable.][rust#88100]
1222 See [the edition guide][rust-2021-edition-guide] for more details.
1223 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1224 - [Union field access is permitted in `const fn`.][rust#85769]
1226 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1231 - [Upgrade to LLVM 13.][rust#87570]
1232 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1233 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1234 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1235 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1236 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1237 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1238 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1240 \* Refer to Rust's [platform support page][platform-support-doc] for more
1241 information on Rust's tiered platform support.
1246 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1247 The Windows console still requires valid Unicode, but this change allows
1248 splitting a UTF-8 character across multiple write calls. This allows, for
1249 instance, programs that just read and write data buffers (e.g. copying a file
1250 to stdout) without regard for Unicode or character boundaries.
1251 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1252 For this use case, atomics scale much better under contention.
1253 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1254 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1255 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1256 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1257 - [Treat invalid environment variable names as non-existent.][rust#86183]
1258 Previously, the environment functions would panic if given a variable name
1259 with an internal null character or equal sign (`=`). Now, these functions will
1260 just treat such names as non-existent variables, since the OS cannot represent
1261 the existence of a variable with such a name.
1266 - [`std::os::unix::fs::chroot`]
1267 - [`UnsafeCell::raw_get`]
1268 - [`BufWriter::into_parts`]
1269 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1270 These APIs were previously stable in `std`, but are now also available in `core`.
1271 - [`Vec::shrink_to`]
1272 - [`String::shrink_to`]
1273 - [`OsString::shrink_to`]
1274 - [`PathBuf::shrink_to`]
1275 - [`BinaryHeap::shrink_to`]
1276 - [`VecDeque::shrink_to`]
1277 - [`HashMap::shrink_to`]
1278 - [`HashSet::shrink_to`]
1280 These APIs are now usable in const contexts:
1282 - [`std::mem::transmute`]
1283 - [`[T]::first`][`slice::first`]
1284 - [`[T]::split_first`][`slice::split_first`]
1285 - [`[T]::last`][`slice::last`]
1286 - [`[T]::split_last`][`slice::split_last`]
1291 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1292 This has no effect at present on dependency version selection.
1293 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1294 that support Rust code to include a crate's specified minimum version in the test matrix for that
1300 - [Update to new argument parsing rules on Windows.][rust#87580]
1301 This adjusts Rust's standard library to match the behavior of the standard
1302 libraries for C/C++. The rules have changed slightly over time, and this PR
1303 brings us to the latest set of rules (changed in 2008).
1304 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1305 This was already not supported by LLVM; this change surfaces this lack of
1306 support with a better error message.
1307 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1308 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1309 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1310 may return different values on glibc <= 2.24.][rust#81825]
1311 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1312 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1313 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1314 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1318 These changes provide no direct user facing benefits, but represent significant
1319 improvements to the internals and overall performance of rustc
1322 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1323 This improves the performance of most Rust builds.
1324 - [Unify representation of macros in internal data structures.][rust#88019]
1325 This change fixes a host of bugs with the handling of macros by the compiler,
1328 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1329 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1330 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1331 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1332 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1333 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1334 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1335 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1336 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1337 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1338 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1339 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1340 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1341 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1342 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1343 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1344 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1345 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1346 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1347 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1348 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1349 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1350 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1351 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1352 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1353 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1354 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1355 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1356 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1357 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1358 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1359 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1360 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1361 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1362 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1363 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1364 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1365 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1366 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1367 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1368 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1369 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1371 Version 1.55.0 (2021-09-09)
1372 ============================
1376 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1377 will end at the maximum value of the integer.][83918]
1378 - [You can now explicitly import the prelude of different editions
1379 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1383 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1385 \* Refer to Rust's [platform support page][platform-support-doc] for more
1386 information on Rust's tiered platform support.
1391 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1392 These improvements should in general provide faster string parsing of floats,
1393 no longer reject certain valid floating point values, and reduce
1394 the produced code size for non-stripped artifacts.
1395 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1402 - [`IntoInnerError::into_error`]
1403 - [`IntoInnerError::into_parts`]
1404 - [`MaybeUninit::assume_init_mut`]
1405 - [`MaybeUninit::assume_init_ref`]
1406 - [`MaybeUninit::write`]
1408 - [`ops::ControlFlow`]
1410 - [`x86::_bittestandcomplement`]
1411 - [`x86::_bittestandreset`]
1412 - [`x86::_bittestandset`]
1413 - [`x86_64::_bittest64`]
1414 - [`x86_64::_bittestandcomplement64`]
1415 - [`x86_64::_bittestandreset64`]
1416 - [`x86_64::_bittestandset64`]
1418 The following previously stable functions are now `const`.
1420 - [`str::from_utf8_unchecked`]
1425 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1426 rustc in parallel such as when using `cargo test`.][cargo/9675]
1427 - [The package definition in `cargo metadata` now includes the `"default_run"`
1428 field from the manifest.][cargo/9550]
1429 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1430 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1431 of packages.][cargo/9663]
1435 - [Added "Go to item on exact match" search option.][85876]
1436 - [The "Implementors" section on traits no longer shows redundant
1437 method definitions.][85970]
1438 - [Trait implementations are toggled open by default.][86260] This should make the
1439 implementations more searchable by tools like `CTRL+F` in your browser.
1440 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1441 through type aliases.][86334]
1442 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1443 "Trait Implementations" section.][86513]
1448 - [std functions that return an `io::Error` will no longer use the
1449 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1450 kinds of errors could be categorised [into newer more specific `ErrorKind`
1451 variants][79965], and that they do not represent a user error.
1452 - [Using environment variable names with `process::Command` on Windows now
1453 behaves as expected.][85270] Previously using envionment variables with
1454 `Command` would cause them to be ASCII-uppercased.
1455 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1456 with `rustdoc::`][86849]
1457 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1458 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1459 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1462 [86849]: https://github.com/rust-lang/rust/pull/86849
1463 [86513]: https://github.com/rust-lang/rust/pull/86513
1464 [86334]: https://github.com/rust-lang/rust/pull/86334
1465 [86260]: https://github.com/rust-lang/rust/pull/86260
1466 [85970]: https://github.com/rust-lang/rust/pull/85970
1467 [85876]: https://github.com/rust-lang/rust/pull/85876
1468 [83572]: https://github.com/rust-lang/rust/pull/83572
1469 [86294]: https://github.com/rust-lang/rust/pull/86294
1470 [86858]: https://github.com/rust-lang/rust/pull/86858
1471 [86761]: https://github.com/rust-lang/rust/pull/86761
1472 [85746]: https://github.com/rust-lang/rust/pull/85746
1473 [85270]: https://github.com/rust-lang/rust/pull/85270
1474 [83918]: https://github.com/rust-lang/rust/pull/83918
1475 [79965]: https://github.com/rust-lang/rust/pull/79965
1476 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1477 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1478 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1479 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1480 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1481 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1482 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1483 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1484 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1485 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1486 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1487 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1488 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1489 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1490 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1491 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1492 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1493 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1494 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1495 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1496 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1497 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1500 Version 1.54.0 (2021-07-29)
1501 ============================
1504 -----------------------
1506 - [You can now use macros for values in some built-in attributes.][83366]
1507 This primarily allows you to call macros within the `#[doc]` attribute. For
1508 example, to include external documentation in your crate, you can now write
1511 #![doc = include_str!("README.md")]
1514 - [You can now cast between unsized slice types (and types which contain
1515 unsized slices) in `const fn`.][85078]
1516 - [You can now use multiple generic lifetimes with `impl Trait` where the
1517 lifetimes don't explicitly outlive another.][84701] In code this means
1518 that you can now have `impl Trait<'a, 'b>` where as before you could
1519 only have `impl Trait<'a, 'b> where 'b: 'a`.
1522 -----------------------
1524 - [Rustc will now search for custom JSON targets in
1525 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1526 directory.][83800] You can find your sysroot directory by running
1527 `rustc --print sysroot`.
1528 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1529 - [You can now use `#[target_feature]` on safe functions when targeting
1530 WebAssembly platforms.][84988]
1531 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1532 - [Added tier 3\* support for `bpfel-unknown-none`
1533 and `bpfeb-unknown-none`.][79608]
1534 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1536 \* Refer to Rust's [platform support page][platform-support-doc] for more
1537 information on Rust's tiered platform support.
1540 -----------------------
1542 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1543 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1544 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1545 - [The implementations of vendor intrinsics in core::arch have been
1546 significantly refactored.][83278] The main user-visible changes are
1547 a 50% reduction in the size of libcore.rlib and stricter validation
1548 of constant operands passed to intrinsics. The latter is technically
1549 a breaking change, but allows Rust to more closely match the C vendor
1555 - [`BTreeMap::into_keys`]
1556 - [`BTreeMap::into_values`]
1557 - [`HashMap::into_keys`]
1558 - [`HashMap::into_values`]
1560 - [`VecDeque::binary_search`]
1561 - [`VecDeque::binary_search_by`]
1562 - [`VecDeque::binary_search_by_key`]
1563 - [`VecDeque::partition_point`]
1568 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1569 the dependency graph.][cargo/9520]
1570 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1571 in the tree ][cargo/9499]
1572 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1573 macro dependencies.][cargo/9488]
1574 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1575 This variable points to a directory that integration tests and benches
1576 can use as a "scratchpad" for testing filesystem operations.
1580 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1581 - [Previously unsound code is no longer permitted where different constructors in branches
1582 could require different lifetimes.][85574]
1583 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1584 than before and may reject some previously accepted code.
1585 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1586 when compiled with `codegen-units = 1`.][86063]
1588 [85574]: https://github.com/rust-lang/rust/issues/85574
1589 [86831]: https://github.com/rust-lang/rust/issues/86831
1590 [86063]: https://github.com/rust-lang/rust/issues/86063
1591 [79608]: https://github.com/rust-lang/rust/pull/79608
1592 [84988]: https://github.com/rust-lang/rust/pull/84988
1593 [84701]: https://github.com/rust-lang/rust/pull/84701
1594 [84072]: https://github.com/rust-lang/rust/pull/84072
1595 [85745]: https://github.com/rust-lang/rust/pull/85745
1596 [84744]: https://github.com/rust-lang/rust/pull/84744
1597 [85078]: https://github.com/rust-lang/rust/pull/85078
1598 [84717]: https://github.com/rust-lang/rust/pull/84717
1599 [83800]: https://github.com/rust-lang/rust/pull/83800
1600 [83366]: https://github.com/rust-lang/rust/pull/83366
1601 [83278]: https://github.com/rust-lang/rust/pull/83278
1602 [85292]: https://github.com/rust-lang/rust/pull/85292
1603 [82834]: https://github.com/rust-lang/rust/pull/82834
1604 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1605 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1606 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1607 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1608 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1609 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1610 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1611 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1612 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1613 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1614 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1616 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1618 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1620 Version 1.53.0 (2021-06-17)
1621 ============================
1624 -----------------------
1625 - [You can now use unicode for identifiers.][83799] This allows multilingual
1626 identifiers but still doesn't allow glyphs that are not considered characters
1627 such as `◆` or `🦀`. More specifically you can now use any identifier that
1628 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1629 is the same standard as languages like Python, however Rust uses NFC
1630 normalization which may be different from other languages.
1631 - [You can now specify "or patterns" inside pattern matches.][79278]
1632 Previously you could only use `|` (OR) on complete patterns. E.g.
1636 matches!(x, Some(1) | Some(2));
1638 matches!(x, Some(1 | 2));
1640 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1641 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1642 to change semantics to being a pattern fragment in a future edition.
1645 -----------------------
1646 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1647 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1648 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1650 \* Refer to Rust's [platform support page][platform-support-doc] for more
1651 information on Rust's tiered platform support.
1654 -----------------------
1655 - [Abort messages will now forward to `android_set_abort_message` on
1656 Android platforms when available.][81469]
1657 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1658 - [Arrays of any length now implement `IntoIterator`.][84147]
1659 Currently calling `.into_iter()` as a method on an array will
1660 return `impl Iterator<Item=&T>`, but this may change in a
1661 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1662 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1663 - [`leading_zeros`, and `trailing_zeros` are now available on all
1664 `NonZero` integer types.][84082]
1665 - [`{f32, f64}::from_str` now parse and print special values
1666 (`NaN`, `-0`) according to IEEE 754.][78618]
1667 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1668 - [Add the `BITS` associated constant to all numeric types.][82565]
1672 - [`AtomicBool::fetch_update`]
1673 - [`AtomicPtr::fetch_update`]
1674 - [`BTreeMap::retain`]
1675 - [`BTreeSet::retain`]
1676 - [`BufReader::seek_relative`]
1677 - [`DebugStruct::non_exhaustive`]
1679 - [`Duration::ZERO`]
1680 - [`Duration::is_zero`]
1681 - [`Duration::saturating_add`]
1682 - [`Duration::saturating_mul`]
1683 - [`Duration::saturating_sub`]
1684 - [`ErrorKind::Unsupported`]
1685 - [`Option::insert`]
1686 - [`Ordering::is_eq`]
1687 - [`Ordering::is_ge`]
1688 - [`Ordering::is_gt`]
1689 - [`Ordering::is_le`]
1690 - [`Ordering::is_lt`]
1691 - [`Ordering::is_ne`]
1692 - [`OsStr::is_ascii`]
1693 - [`OsStr::make_ascii_lowercase`]
1694 - [`OsStr::make_ascii_uppercase`]
1695 - [`OsStr::to_ascii_lowercase`]
1696 - [`OsStr::to_ascii_uppercase`]
1697 - [`Peekable::peek_mut`]
1698 - [`Rc::decrement_strong_count`]
1699 - [`Rc::increment_strong_count`]
1700 - [`Vec::extend_from_within`]
1701 - [`array::from_mut`]
1702 - [`array::from_ref`]
1703 - [`cmp::max_by_key`]
1705 - [`cmp::min_by_key`]
1707 - [`f32::is_subnormal`]
1708 - [`f64::is_subnormal`]
1711 -----------------------
1712 - [Cargo now supports git repositories where the default `HEAD` branch is not
1713 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1714 which can handle default branches correctly.
1715 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1716 - [The `authors` field is no longer included in `Cargo.toml` for new
1717 projects.][cargo/9282]
1720 -----------------------
1721 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1722 without hyperlinks.][81764]
1726 - [Implement token-based handling of attributes during expansion][82608]
1727 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1728 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1729 to confusion and potential security vulnerabilities and [is no
1730 longer recommended][ietf6943].
1731 - [The added `BITS` constant may conflict with external definitions.][85667]
1732 In particular, this was known to be a problem in the `lexical-core` crate,
1733 but they have published fixes for semantic versions 0.4 through 0.7. To
1734 update this dependency alone, use `cargo update -p lexical-core`.
1735 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1739 These changes provide no direct user facing benefits, but represent significant
1740 improvements to the internals and overall performance of rustc and
1743 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1744 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1745 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1746 - [Rework rustdoc const type][82873]
1748 [85667]: https://github.com/rust-lang/rust/pull/85667
1749 [83386]: https://github.com/rust-lang/rust/pull/83386
1750 [82771]: https://github.com/rust-lang/rust/pull/82771
1751 [84147]: https://github.com/rust-lang/rust/pull/84147
1752 [84082]: https://github.com/rust-lang/rust/pull/84082
1753 [83799]: https://github.com/rust-lang/rust/pull/83799
1754 [83681]: https://github.com/rust-lang/rust/pull/83681
1755 [83652]: https://github.com/rust-lang/rust/pull/83652
1756 [83387]: https://github.com/rust-lang/rust/pull/83387
1757 [82873]: https://github.com/rust-lang/rust/pull/82873
1758 [82864]: https://github.com/rust-lang/rust/pull/82864
1759 [82608]: https://github.com/rust-lang/rust/pull/82608
1760 [82565]: https://github.com/rust-lang/rust/pull/82565
1761 [80525]: https://github.com/rust-lang/rust/pull/80525
1762 [79278]: https://github.com/rust-lang/rust/pull/79278
1763 [78618]: https://github.com/rust-lang/rust/pull/78618
1764 [77704]: https://github.com/rust-lang/rust/pull/77704
1765 [83941]: https://github.com/rust-lang/rust/pull/83941
1766 [83065]: https://github.com/rust-lang/rust/pull/83065
1767 [81764]: https://github.com/rust-lang/rust/pull/81764
1768 [81469]: https://github.com/rust-lang/rust/pull/81469
1769 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1770 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1771 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1772 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1773 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1774 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1775 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1776 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1777 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1778 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1779 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1780 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1781 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1782 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1783 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1784 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1785 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1786 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1787 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1788 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1789 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1790 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1791 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1792 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1793 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1794 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1795 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1796 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1797 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1798 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1799 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1800 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1801 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1802 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1803 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1804 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1805 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1806 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1807 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1808 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1809 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1812 Version 1.52.1 (2021-05-10)
1813 ============================
1815 This release disables incremental compilation, unless the user has explicitly
1816 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1818 This is due to the widespread, and frequently occurring, breakage encountered by
1819 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1820 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1821 newly added incremental verification are still present in past stable versions,
1822 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1825 These problems only affect incremental builds, so release builds with Cargo
1826 should not be affected unless the user has explicitly opted into incremental.
1827 Debug and check builds are affected.
1829 See [84970] for more details.
1831 [84970]: https://github.com/rust-lang/rust/issues/84970
1833 Version 1.52.0 (2021-05-06)
1834 ============================
1838 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1839 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1840 is allowed by default, and may become a warning or hard error in a
1842 - [You can now cast mutable references to arrays to a pointer of the same type as
1843 the element.][81479]
1847 - [Upgraded the default LLVM to LLVM 12.][81451]
1849 Added tier 3\* support for the following targets.
1851 - [`s390x-unknown-linux-musl`][82166]
1852 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1853 - [`powerpc-unknown-openbsd`][82733]
1855 \* Refer to Rust's [platform support page][platform-support-doc] for more
1856 information on Rust's tiered platform support.
1860 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1861 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1862 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1863 - [All integer division and remainder operations are now `const`.][80962]
1867 - [`Arguments::as_str`]
1869 - [`char::REPLACEMENT_CHARACTER`]
1870 - [`char::UNICODE_VERSION`]
1871 - [`char::decode_utf16`]
1872 - [`char::from_digit`]
1873 - [`char::from_u32_unchecked`]
1874 - [`char::from_u32`]
1875 - [`slice::partition_point`]
1876 - [`str::rsplit_once`]
1877 - [`str::split_once`]
1879 The following previously stable APIs are now `const`.
1881 - [`char::len_utf8`]
1882 - [`char::len_utf16`]
1883 - [`char::to_ascii_uppercase`]
1884 - [`char::to_ascii_lowercase`]
1885 - [`char::eq_ignore_ascii_case`]
1886 - [`u8::to_ascii_uppercase`]
1887 - [`u8::to_ascii_lowercase`]
1888 - [`u8::eq_ignore_ascii_case`]
1892 - [Rustdoc lints are now treated as a tool lint, meaning that
1893 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1894 Using the old style is still allowed, and will become a warning in
1896 - [Rustdoc now supports argument files.][82261]
1897 - [Rustdoc now generates smart punctuation for documentation.][79423]
1898 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1906 - [You can now pass multiple filters to tests.][81356] E.g.
1907 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1908 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1909 allowing you to see `std` symbols when debugging.][82218]
1913 These changes provide no direct user facing benefits, but represent significant
1914 improvements to the internals and overall performance of rustc and
1917 - [Check the result cache before the DepGraph when ensuring queries][81855]
1918 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1919 - [Only store a LocalDefId in some HIR nodes][81611]
1920 - [Store HIR attributes in a side table][79519]
1924 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1925 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1926 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1927 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1928 languages in code blocks.][78429]
1929 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1930 - [Changes in how proc macros handle whitespace may lead to panics when used
1931 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1932 - [Turn `#[derive]` into a regular macro attribute][79078]
1934 [84136]: https://github.com/rust-lang/rust/issues/84136
1935 [80763]: https://github.com/rust-lang/rust/pull/80763
1936 [82166]: https://github.com/rust-lang/rust/pull/82166
1937 [82121]: https://github.com/rust-lang/rust/pull/82121
1938 [81879]: https://github.com/rust-lang/rust/pull/81879
1939 [82261]: https://github.com/rust-lang/rust/pull/82261
1940 [82218]: https://github.com/rust-lang/rust/pull/82218
1941 [82216]: https://github.com/rust-lang/rust/pull/82216
1942 [82202]: https://github.com/rust-lang/rust/pull/82202
1943 [81855]: https://github.com/rust-lang/rust/pull/81855
1944 [81766]: https://github.com/rust-lang/rust/pull/81766
1945 [81744]: https://github.com/rust-lang/rust/pull/81744
1946 [81611]: https://github.com/rust-lang/rust/pull/81611
1947 [81479]: https://github.com/rust-lang/rust/pull/81479
1948 [81451]: https://github.com/rust-lang/rust/pull/81451
1949 [81356]: https://github.com/rust-lang/rust/pull/81356
1950 [80962]: https://github.com/rust-lang/rust/pull/80962
1951 [80553]: https://github.com/rust-lang/rust/pull/80553
1952 [80527]: https://github.com/rust-lang/rust/pull/80527
1953 [79519]: https://github.com/rust-lang/rust/pull/79519
1954 [79423]: https://github.com/rust-lang/rust/pull/79423
1955 [79208]: https://github.com/rust-lang/rust/pull/79208
1956 [78429]: https://github.com/rust-lang/rust/pull/78429
1957 [82733]: https://github.com/rust-lang/rust/pull/82733
1958 [82594]: https://github.com/rust-lang/rust/pull/82594
1959 [79078]: https://github.com/rust-lang/rust/pull/79078
1960 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1961 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1962 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1963 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1964 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1965 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1966 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1967 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1968 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1969 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1970 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1971 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1972 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1973 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1974 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1975 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1976 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1977 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1978 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1979 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1980 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1981 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1983 Version 1.51.0 (2021-03-25)
1984 ============================
1988 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1989 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1990 E.g. you can now write the following. Note: Only values of primitive integers,
1991 `bool`, or `char` types are currently permitted.
1993 struct GenericArray<T, const LENGTH: usize> {
1997 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1998 const fn last(&self) -> Option<&T> {
2002 Some(&self.inner[LENGTH - 1])
2012 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2013 This option controls whether debug information is split across multiple files
2014 or packed into a single file. **Note** This option is unstable on other platforms.
2015 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2016 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2017 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2018 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2020 \* Refer to Rust's [platform support page][platform-support-doc] for more
2021 information on Rust's tiered platform support.
2026 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2027 - [`str` now implements `AsMut<str>`.][80279]
2028 - [`u64` and `u128` now implement `From<char>`.][79502]
2029 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2030 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2031 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2032 - [`io::Empty` now implements `io::Seek`.][78044]
2033 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2034 `T: ?Sized` types.][80764]
2035 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2041 - [`Arc::decrement_strong_count`]
2042 - [`Arc::increment_strong_count`]
2043 - [`Once::call_once_force`]
2044 - [`Peekable::next_if_eq`]
2045 - [`Peekable::next_if`]
2046 - [`Seek::stream_position`]
2047 - [`array::IntoIter`]
2048 - [`panic::panic_any`]
2050 - [`ptr::addr_of_mut!`]
2051 - [`slice::fill_with`]
2052 - [`slice::split_inclusive_mut`]
2053 - [`slice::split_inclusive`]
2054 - [`slice::strip_prefix`]
2055 - [`slice::strip_suffix`]
2056 - [`str::split_inclusive`]
2057 - [`sync::OnceState`]
2059 - [`VecDeque::range`]
2060 - [`VecDeque::range_mut`]
2064 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2065 codegen option.][cargo/9112]
2066 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2067 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2068 to avoid unifying features of dependencies where that unification could be unwanted.
2069 Such as using the same dependency with a `std` feature in a build scripts and
2070 proc-macros, while using the `no-std` feature in the final binary. See the
2071 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2076 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2077 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2078 documentation.][79642]
2080 Various improvements to intra-doc links:
2082 - [You can link to non-path primitives such as `slice`.][80181]
2083 - [You can link to associated items.][74489]
2084 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2088 - [You can now pass `--include-ignored` to tests (e.g. with
2089 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2094 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2095 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2097 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2098 for the distributed artifacts.][81521]
2099 - `armv5te-unknown-linux-gnueabi`
2100 - `sparc64-unknown-linux-gnu`
2101 - `thumbv7neon-unknown-linux-gnueabihf`
2102 - `armv7-unknown-linux-gnueabi`
2103 - `x86_64-unknown-linux-gnux32`
2104 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2109 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2111 [79135]: https://github.com/rust-lang/rust/pull/79135
2112 [74489]: https://github.com/rust-lang/rust/pull/74489
2113 [76934]: https://github.com/rust-lang/rust/pull/76934
2114 [79570]: https://github.com/rust-lang/rust/pull/79570
2115 [80181]: https://github.com/rust-lang/rust/pull/80181
2116 [79642]: https://github.com/rust-lang/rust/pull/79642
2117 [80945]: https://github.com/rust-lang/rust/pull/80945
2118 [80279]: https://github.com/rust-lang/rust/pull/80279
2119 [80053]: https://github.com/rust-lang/rust/pull/80053
2120 [79502]: https://github.com/rust-lang/rust/pull/79502
2121 [75180]: https://github.com/rust-lang/rust/pull/75180
2122 [81521]: https://github.com/rust-lang/rust/pull/81521
2123 [80968]: https://github.com/rust-lang/rust/pull/80968
2124 [80959]: https://github.com/rust-lang/rust/pull/80959
2125 [80718]: https://github.com/rust-lang/rust/pull/80718
2126 [80653]: https://github.com/rust-lang/rust/pull/80653
2127 [80579]: https://github.com/rust-lang/rust/pull/80579
2128 [79998]: https://github.com/rust-lang/rust/pull/79998
2129 [78044]: https://github.com/rust-lang/rust/pull/78044
2130 [81455]: https://github.com/rust-lang/rust/pull/81455
2131 [80764]: https://github.com/rust-lang/rust/pull/80764
2132 [80749]: https://github.com/rust-lang/rust/pull/80749
2133 [80662]: https://github.com/rust-lang/rust/pull/80662
2134 [79134]: https://github.com/rust-lang/rust/pull/79134
2135 [80966]: https://github.com/rust-lang/rust/pull/80966
2136 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2137 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2138 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2139 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2140 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2141 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2142 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2143 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2144 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2145 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2146 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2147 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2148 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2149 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2150 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2151 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2152 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2153 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2154 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2155 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2156 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2157 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2158 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2160 Version 1.50.0 (2021-02-11)
2161 ============================
2164 -----------------------
2165 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2166 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2167 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2170 -----------------------
2171 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2172 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2173 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2174 - [Dropped support for all cloudabi targets.][78439]
2176 \* Refer to Rust's [platform support page][platform-support-doc] for more
2177 information on Rust's tiered platform support.
2180 -----------------------
2182 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2183 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2184 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2185 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2186 up the same amount of space as `File`.
2192 - [`btree_map::Entry::or_insert_with_key`]
2195 - [`hash_map::Entry::or_insert_with_key`]
2199 - [`UnsafeCell::get_mut`]
2201 The following previously stable methods are now `const`.
2203 - [`IpAddr::is_ipv4`]
2204 - [`IpAddr::is_ipv6`]
2205 - [`IpAddr::is_unspecified`]
2206 - [`IpAddr::is_loopback`]
2207 - [`IpAddr::is_multicast`]
2208 - [`Ipv4Addr::octets`]
2209 - [`Ipv4Addr::is_loopback`]
2210 - [`Ipv4Addr::is_private`]
2211 - [`Ipv4Addr::is_link_local`]
2212 - [`Ipv4Addr::is_multicast`]
2213 - [`Ipv4Addr::is_broadcast`]
2214 - [`Ipv4Addr::is_documentation`]
2215 - [`Ipv4Addr::to_ipv6_compatible`]
2216 - [`Ipv4Addr::to_ipv6_mapped`]
2217 - [`Ipv6Addr::segments`]
2218 - [`Ipv6Addr::is_unspecified`]
2219 - [`Ipv6Addr::is_loopback`]
2220 - [`Ipv6Addr::is_multicast`]
2221 - [`Ipv6Addr::to_ipv4`]
2224 - [`Layout::from_size_align`]
2225 - `pow` for all integer types.
2226 - `checked_pow` for all integer types.
2227 - `saturating_pow` for all integer types.
2228 - `wrapping_pow` for all integer types.
2229 - `next_power_of_two` for all unsigned integer types.
2230 - `checked_next_power_of_two` for all unsigned integer types.
2233 -----------------------
2235 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2236 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2237 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2238 contents of that directory for changes.][cargo/8973]
2239 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2244 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2245 - [Running tests will now print the total time taken to execute.][75752]
2250 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2251 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2252 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2253 unhygenic `macro_rules!` macros.][79472]
2254 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2255 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2256 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2257 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2258 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2259 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2261 [74989]: https://github.com/rust-lang/rust/pull/74989
2262 [79261]: https://github.com/rust-lang/rust/pull/79261
2263 [79896]: https://github.com/rust-lang/rust/pull/79896
2264 [79484]: https://github.com/rust-lang/rust/pull/79484
2265 [79472]: https://github.com/rust-lang/rust/pull/79472
2266 [79270]: https://github.com/rust-lang/rust/pull/79270
2267 [79003]: https://github.com/rust-lang/rust/pull/79003
2268 [78864]: https://github.com/rust-lang/rust/pull/78864
2269 [78636]: https://github.com/rust-lang/rust/pull/78636
2270 [78439]: https://github.com/rust-lang/rust/pull/78439
2271 [78343]: https://github.com/rust-lang/rust/pull/78343
2272 [78296]: https://github.com/rust-lang/rust/pull/78296
2273 [78068]: https://github.com/rust-lang/rust/pull/78068
2274 [75752]: https://github.com/rust-lang/rust/pull/75752
2275 [74699]: https://github.com/rust-lang/rust/pull/74699
2276 [78142]: https://github.com/rust-lang/rust/pull/78142
2277 [77484]: https://github.com/rust-lang/rust/pull/77484
2278 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2279 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2280 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2281 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2282 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2283 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2284 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2285 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2286 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2287 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2288 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2289 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2290 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2291 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2292 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2293 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2294 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2295 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2296 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2297 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2298 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2299 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2300 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2301 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2302 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2303 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2304 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2305 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2306 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2307 [`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
2308 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2309 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2310 [`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
2311 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2314 Version 1.49.0 (2020-12-31)
2315 ============================
2318 -----------------------
2320 - [Unions can now implement `Drop`, and you can now have a field in a union
2321 with `ManuallyDrop<T>`.][77547]
2322 - [You can now cast uninhabited enums to integers.][76199]
2323 - [You can now bind by reference and by move in patterns.][76119] This
2324 allows you to selectively borrow individual components of a type. E.g.
2332 let person = Person {
2333 name: String::from("Alice"),
2337 // `name` is moved out of person, but `age` is referenced.
2338 let Person { name, ref age } = person;
2339 println!("{} {}", name, age);
2343 -----------------------
2345 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2346 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2347 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2348 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2349 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2350 - [Output from threads spawned in tests is now captured.][78227]
2351 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2353 \* Refer to Rust's [platform support page][platform-support-doc] for more
2354 information on Rust's tiered platform support.
2357 -----------------------
2359 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2360 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2365 - [`slice::select_nth_unstable`]
2366 - [`slice::select_nth_unstable_by`]
2367 - [`slice::select_nth_unstable_by_key`]
2369 The following previously stable methods are now `const`.
2371 - [`Poll::is_ready`]
2372 - [`Poll::is_pending`]
2375 -----------------------
2376 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2377 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2378 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2379 variable will be set if the crate being built is one the user selected to build, either
2380 with `-p` or through defaults.
2381 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2387 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2388 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2389 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2390 Previously such invalid or unused attributes could be ignored.
2391 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2392 read [this post about the changes][rustdoc-ws-post] for more details.
2393 - [Trait bounds are no longer inferred for associated types.][79904]
2397 These changes provide no direct user facing benefits, but represent significant
2398 improvements to the internals and overall performance of rustc and
2401 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2402 Local Storage model.][78201]
2403 - [Calculate visibilities once in resolve.][78077]
2404 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2405 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2408 [75991]: https://github.com/rust-lang/rust/pull/75991
2409 [78951]: https://github.com/rust-lang/rust/pull/78951
2410 [78848]: https://github.com/rust-lang/rust/pull/78848
2411 [78746]: https://github.com/rust-lang/rust/pull/78746
2412 [78376]: https://github.com/rust-lang/rust/pull/78376
2413 [78228]: https://github.com/rust-lang/rust/pull/78228
2414 [78227]: https://github.com/rust-lang/rust/pull/78227
2415 [78201]: https://github.com/rust-lang/rust/pull/78201
2416 [78109]: https://github.com/rust-lang/rust/pull/78109
2417 [78077]: https://github.com/rust-lang/rust/pull/78077
2418 [77997]: https://github.com/rust-lang/rust/pull/77997
2419 [77703]: https://github.com/rust-lang/rust/pull/77703
2420 [77547]: https://github.com/rust-lang/rust/pull/77547
2421 [77015]: https://github.com/rust-lang/rust/pull/77015
2422 [76199]: https://github.com/rust-lang/rust/pull/76199
2423 [76119]: https://github.com/rust-lang/rust/pull/76119
2424 [75914]: https://github.com/rust-lang/rust/pull/75914
2425 [79004]: https://github.com/rust-lang/rust/pull/79004
2426 [78676]: https://github.com/rust-lang/rust/pull/78676
2427 [79904]: https://github.com/rust-lang/rust/issues/79904
2428 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2429 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2430 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2431 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2432 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2433 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2434 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2435 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2436 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2437 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2439 Version 1.48.0 (2020-11-19)
2440 ==========================
2445 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2446 is still rejected *semantically*, but can now be parsed by procedural macros.
2450 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2451 `rustc` whether to link its own C runtime and libraries or to rely on a external
2452 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2453 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2454 Note: If you're using cargo you must explicitly pass the `--target` flag.
2455 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2457 \* Refer to Rust's [platform support page][platform-support-doc] for more
2458 information on Rust's tiered platform support.
2462 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2463 and `&Stderr`.][76275]
2464 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2465 - [The `matches!` macro now supports having a trailing comma.][74880]
2466 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2467 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2471 - [`slice::as_ptr_range`]
2472 - [`slice::as_mut_ptr_range`]
2473 - [`VecDeque::make_contiguous`]
2474 - [`future::pending`]
2477 The following previously stable methods are now `const fn`'s:
2479 - [`Option::is_some`]
2480 - [`Option::is_none`]
2481 - [`Option::as_ref`]
2483 - [`Result::is_err`]
2484 - [`Result::as_ref`]
2485 - [`Ordering::reverse`]
2486 - [`Ordering::then`]
2493 - [You can now link to items in `rustdoc` using the intra-doc link
2494 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2495 a link to `std::future`'s documentation. See ["Linking to items by
2496 name"][intradoc-links] for more information.
2497 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2498 when searching through `rustdoc`'s UI.][75740]
2502 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2503 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2504 promoted to `'static` lifetime any more inside `const fn`s.
2505 - [Associated type bindings on trait objects are now verified to meet the bounds
2506 declared on the trait when checking that they implement the trait.][27675]
2507 - [When trait bounds on associated types or opaque types are ambiguous, the
2508 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2509 - [Fixed recursive nonterminals not being expanded in macros during
2510 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2511 correctly handling recursive nonterminal tokens.
2512 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2513 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2514 in places where they have no effect.][73461]
2515 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2516 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2517 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2518 disallow zero-initialization.][71274]
2519 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2520 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2521 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2522 see the [`catch_unwind`] documentation for further information.
2528 These changes provide no direct user facing benefits, but represent significant
2529 improvements to the internals and overall performance of rustc and
2532 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2533 You can continue building with `make` by setting `ninja=false` in
2535 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2536 - [Made `ensure_sufficient_stack()` non-generic][76680]
2538 [78143]: https://github.com/rust-lang/rust/issues/78143
2539 [76680]: https://github.com/rust-lang/rust/pull/76680/
2540 [76030]: https://github.com/rust-lang/rust/pull/76030/
2541 [70212]: https://github.com/rust-lang/rust/pull/70212/
2542 [27675]: https://github.com/rust-lang/rust/issues/27675/
2543 [54121]: https://github.com/rust-lang/rust/issues/54121/
2544 [71274]: https://github.com/rust-lang/rust/pull/71274/
2545 [77386]: https://github.com/rust-lang/rust/pull/77386/
2546 [77153]: https://github.com/rust-lang/rust/pull/77153/
2547 [77055]: https://github.com/rust-lang/rust/pull/77055/
2548 [76275]: https://github.com/rust-lang/rust/pull/76275/
2549 [76310]: https://github.com/rust-lang/rust/pull/76310/
2550 [76420]: https://github.com/rust-lang/rust/pull/76420/
2551 [76158]: https://github.com/rust-lang/rust/pull/76158/
2552 [75857]: https://github.com/rust-lang/rust/pull/75857/
2553 [75585]: https://github.com/rust-lang/rust/pull/75585/
2554 [75740]: https://github.com/rust-lang/rust/pull/75740/
2555 [75502]: https://github.com/rust-lang/rust/pull/75502/
2556 [74880]: https://github.com/rust-lang/rust/pull/74880/
2557 [74922]: https://github.com/rust-lang/rust/pull/74922/
2558 [74430]: https://github.com/rust-lang/rust/pull/74430/
2559 [74194]: https://github.com/rust-lang/rust/pull/74194/
2560 [73461]: https://github.com/rust-lang/rust/pull/73461/
2561 [73166]: https://github.com/rust-lang/rust/pull/73166/
2562 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2563 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2564 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2565 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2566 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2567 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2568 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2569 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2570 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2571 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2572 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2573 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2574 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2575 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2576 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2579 Version 1.47.0 (2020-10-08)
2580 ==========================
2584 - [Closures will now warn when not used.][74869]
2588 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2589 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2591 - [Upgraded to LLVM 11.][73526]
2592 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2593 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2594 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2596 \* Refer to Rust's [platform support page][platform-support-doc] for more
2597 information on Rust's tiered platform support.
2601 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2602 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2603 those of length less than 33.][74060]
2604 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2605 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2606 `PartialEq`, and `PartialOrd`.][73583]
2610 - [`Ident::new_raw`]
2611 - [`Range::is_empty`]
2612 - [`RangeInclusive::is_empty`]
2613 - [`Result::as_deref`]
2614 - [`Result::as_deref_mut`]
2616 - [`pointer::offset_from`]
2620 The following previously stable APIs have now been made const.
2622 - [The `new` method for all `NonZero` integers.][73858]
2623 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2624 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2625 methods for all integers.][73858]
2626 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2627 signed integers.][73858]
2628 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2629 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2630 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2631 `is_ascii_control` methods for `char` and `u8`.][73858]
2635 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2636 You can override this by setting the following in your `Cargo.toml`.
2638 [profile.release.build-override]
2641 - [`cargo-help` will now display man pages for commands rather just the
2642 `--help` text.][cargo/8456]
2643 - [`cargo-metadata` now emits a `test` field indicating if a target has
2644 tests enabled.][cargo/8478]
2645 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2646 - [`cargo-publish` will now use an alternative registry by default if it's the
2647 only registry specified in `package.publish`.][cargo/8571]
2651 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2652 type based search.][75366]
2653 - [Added the Ayu theme to rustdoc.][71237]
2657 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2658 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2659 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2660 help to preserve more span information.][73084] These changes may cause
2661 compilation errors if your macro was unhygenic or didn't correctly handle
2663 - [Moved support for the CloudABI target to tier 3.][75568]
2664 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2665 - [Added the `rustc-docs` component.][75560] This allows you to install
2666 and read the documentation for the compiler internal APIs. (Currently only
2667 available for `x86_64-unknown-linux-gnu`.)
2672 - [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.
2674 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2675 [75048]: https://github.com/rust-lang/rust/pull/75048/
2676 [74163]: https://github.com/rust-lang/rust/pull/74163/
2677 [71237]: https://github.com/rust-lang/rust/pull/71237/
2678 [74869]: https://github.com/rust-lang/rust/pull/74869/
2679 [73858]: https://github.com/rust-lang/rust/pull/73858/
2680 [75716]: https://github.com/rust-lang/rust/pull/75716/
2681 [75560]: https://github.com/rust-lang/rust/pull/75560/
2682 [75568]: https://github.com/rust-lang/rust/pull/75568/
2683 [75366]: https://github.com/rust-lang/rust/pull/75366/
2684 [75204]: https://github.com/rust-lang/rust/pull/75204/
2685 [74650]: https://github.com/rust-lang/rust/pull/74650/
2686 [74419]: https://github.com/rust-lang/rust/pull/74419/
2687 [73964]: https://github.com/rust-lang/rust/pull/73964/
2688 [74021]: https://github.com/rust-lang/rust/pull/74021/
2689 [74060]: https://github.com/rust-lang/rust/pull/74060/
2690 [73893]: https://github.com/rust-lang/rust/pull/73893/
2691 [73526]: https://github.com/rust-lang/rust/pull/73526/
2692 [73583]: https://github.com/rust-lang/rust/pull/73583/
2693 [73084]: https://github.com/rust-lang/rust/pull/73084/
2694 [73197]: https://github.com/rust-lang/rust/pull/73197/
2695 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2696 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2697 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2698 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2699 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2700 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2701 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2702 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2703 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2704 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2705 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2706 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2707 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2708 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2711 Version 1.46.0 (2020-08-27)
2712 ==========================
2716 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2717 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2718 const functions.][73862]
2719 - [The `#[track_caller]` attribute can now be added to functions to use the
2720 function's caller's location information for panic messages.][72445]
2721 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2722 `x.0.0` over `(x.0).0`.
2723 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2724 You currently can't use `mem::transmute` in constant functions.
2728 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2729 - [Enabled static "Position Independent Executables" by default
2730 for `x86_64-unknown-linux-musl`.][70740]
2734 - [`mem::forget` is now a `const fn`.][73887]
2735 - [`String` now implements `From<char>`.][73466]
2736 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2737 integer types.][73032]
2738 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2739 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2740 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2741 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2742 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2743 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2748 - [`vec::Drain::as_slice`]
2752 Added a number of new environment variables that are now available when
2753 compiling your crate.
2755 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2756 the specific binary being compiled and the name of the crate.
2757 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2758 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2762 - [The target configuration option `abi_blacklist` has been renamed
2763 to `unsupported_abis`.][74150] The old name will still continue to work.
2764 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2765 This was previously accepted but will become a hard error in a future release.
2766 - [Rustc will fail to compile if you have a struct with
2767 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2769 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2770 ensure that spans have the correct information, and may cause breakage if you
2771 were relying on receiving spans with dummy information.
2772 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2773 a legacy installer that was replaced by a MSI installer a few years ago but
2774 was still being built.
2775 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2776 - [Rustc will no longer accept overlapping trait implementations that only
2777 differ in how the lifetime was bound.][72493]
2778 - [Rustc now correctly relates the lifetime of an existential associated
2779 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2780 you to pass a shorter lifetime than expected.
2781 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2782 The library will need to be installed for `rustc` to work, even though we
2783 expect it to be already available on most systems.
2784 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2786 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2787 exact output returned by rustc's pretty printing is an unstable
2788 implementation detail: we recommend any macro relying on it to switch to a
2789 more robust parsing system.
2791 [75453]: https://github.com/rust-lang/rust/issues/75453/
2792 [74820]: https://github.com/rust-lang/rust/issues/74820/
2793 [74420]: https://github.com/rust-lang/rust/issues/74420/
2794 [74109]: https://github.com/rust-lang/rust/pull/74109/
2795 [74150]: https://github.com/rust-lang/rust/pull/74150/
2796 [73862]: https://github.com/rust-lang/rust/pull/73862/
2797 [73887]: https://github.com/rust-lang/rust/pull/73887/
2798 [73466]: https://github.com/rust-lang/rust/pull/73466/
2799 [73516]: https://github.com/rust-lang/rust/pull/73516/
2800 [73293]: https://github.com/rust-lang/rust/pull/73293/
2801 [73007]: https://github.com/rust-lang/rust/pull/73007/
2802 [73032]: https://github.com/rust-lang/rust/pull/73032/
2803 [72920]: https://github.com/rust-lang/rust/pull/72920/
2804 [72569]: https://github.com/rust-lang/rust/pull/72569/
2805 [72583]: https://github.com/rust-lang/rust/pull/72583/
2806 [72584]: https://github.com/rust-lang/rust/pull/72584/
2807 [72717]: https://github.com/rust-lang/rust/pull/72717/
2808 [72437]: https://github.com/rust-lang/rust/pull/72437/
2809 [72445]: https://github.com/rust-lang/rust/pull/72445/
2810 [72486]: https://github.com/rust-lang/rust/pull/72486/
2811 [72493]: https://github.com/rust-lang/rust/pull/72493/
2812 [72331]: https://github.com/rust-lang/rust/pull/72331/
2813 [71896]: https://github.com/rust-lang/rust/pull/71896/
2814 [71660]: https://github.com/rust-lang/rust/pull/71660/
2815 [71322]: https://github.com/rust-lang/rust/pull/71322/
2816 [70740]: https://github.com/rust-lang/rust/pull/70740/
2817 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2818 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2819 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2820 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2821 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2824 Version 1.45.2 (2020-08-03)
2825 ==========================
2827 * [Fix bindings in tuple struct patterns][74954]
2828 * [Fix track_caller integration with trait objects][74784]
2830 [74954]: https://github.com/rust-lang/rust/issues/74954
2831 [74784]: https://github.com/rust-lang/rust/issues/74784
2834 Version 1.45.1 (2020-07-30)
2835 ==========================
2837 * [Fix const propagation with references.][73613]
2838 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2839 * [Avoid spurious implicit region bound.][74509]
2840 * [Install clippy on x.py install][74457]
2842 [73613]: https://github.com/rust-lang/rust/pull/73613
2843 [73078]: https://github.com/rust-lang/rust/issues/73078
2844 [74509]: https://github.com/rust-lang/rust/pull/74509
2845 [74457]: https://github.com/rust-lang/rust/pull/74457
2848 Version 1.45.0 (2020-07-16)
2849 ==========================
2853 - [Out of range float to int conversions using `as` has been defined as a saturating
2854 conversion.][71269] This was previously undefined behaviour, but you can use the
2855 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2856 may be desirable in rare performance sensitive situations.
2857 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2858 using `u64`.][70705]
2859 - [Function like procedural macros can now be used in expression, pattern, and statement
2860 positions.][68717] This means you can now use a function-like procedural macro
2861 anywhere you can use a declarative (`macro_rules!`) macro.
2865 - [You can now override individual target features through the `target-feature`
2866 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2867 equivalent to `-C target-feature=+avx2,+fma`.
2868 - [Added the `force-unwind-tables` flag.][69984] This option allows
2869 rustc to always generate unwind tables regardless of panic strategy.
2870 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2871 to include LLVM bitcode into generated `rlib`s (this is on by default).
2872 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2873 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2874 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2875 - [Upgraded to LLVM 10.][67759]
2877 \* Refer to Rust's [platform support page][platform-support-doc] for more
2878 information on Rust's tiered platform support.
2883 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2885 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2886 - [You can now use `char` with
2887 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2888 a range of codepoints.][72413] E.g.
2889 you can now write the following;
2891 for ch in 'a'..='z' {
2895 // Prints "abcdefghijklmnopqrstuvwxyz"
2897 - [`OsString` now implements `FromStr`.][71662]
2898 - [The `saturating_neg` method has been added to all signed integer primitive
2899 types, and the `saturating_abs` method has been added for all integer
2900 primitive types.][71886]
2901 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2902 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2904 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2905 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2906 integer types.][69813]
2907 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2908 integer types.][72324]
2909 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2914 - [`BTreeMap::remove_entry`]
2916 - [`rc::Weak::as_ptr`]
2917 - [`rc::Weak::from_raw`]
2918 - [`rc::Weak::into_raw`]
2919 - [`str::strip_prefix`]
2920 - [`str::strip_suffix`]
2921 - [`sync::Weak::as_ptr`]
2922 - [`sync::Weak::from_raw`]
2923 - [`sync::Weak::into_raw`]
2924 - [`char::UNICODE_VERSION`]
2925 - [`Span::resolved_at`]
2926 - [`Span::located_at`]
2927 - [`Span::mixed_site`]
2928 - [`unix::process::CommandExt::arg0`]
2933 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2938 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2939 `~~outdated information~~` becomes "~~outdated information~~".
2940 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2944 - [Trying to self initialize a static value (that is creating a value using
2945 itself) is unsound and now causes a compile error.][71140]
2946 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2947 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2948 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2949 previously undocumented and not intended for public use. Rustdoc still provides
2950 a non-zero exit code on errors.
2951 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2952 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2953 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2954 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2955 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2959 - [Make clippy a git subtree instead of a git submodule][70655]
2960 - [Unify the undo log of all snapshot types][69464]
2962 [71848]: https://github.com/rust-lang/rust/issues/71848/
2963 [73420]: https://github.com/rust-lang/rust/issues/73420/
2964 [72324]: https://github.com/rust-lang/rust/pull/72324/
2965 [71843]: https://github.com/rust-lang/rust/pull/71843/
2966 [71886]: https://github.com/rust-lang/rust/pull/71886/
2967 [72234]: https://github.com/rust-lang/rust/pull/72234/
2968 [72239]: https://github.com/rust-lang/rust/pull/72239/
2969 [72397]: https://github.com/rust-lang/rust/pull/72397/
2970 [72413]: https://github.com/rust-lang/rust/pull/72413/
2971 [72014]: https://github.com/rust-lang/rust/pull/72014/
2972 [72062]: https://github.com/rust-lang/rust/pull/72062/
2973 [72094]: https://github.com/rust-lang/rust/pull/72094/
2974 [72133]: https://github.com/rust-lang/rust/pull/72133/
2975 [67759]: https://github.com/rust-lang/rust/pull/67759/
2976 [71900]: https://github.com/rust-lang/rust/pull/71900/
2977 [71928]: https://github.com/rust-lang/rust/pull/71928/
2978 [71662]: https://github.com/rust-lang/rust/pull/71662/
2979 [71716]: https://github.com/rust-lang/rust/pull/71716/
2980 [71447]: https://github.com/rust-lang/rust/pull/71447/
2981 [71269]: https://github.com/rust-lang/rust/pull/71269/
2982 [71095]: https://github.com/rust-lang/rust/pull/71095/
2983 [71140]: https://github.com/rust-lang/rust/pull/71140/
2984 [70655]: https://github.com/rust-lang/rust/pull/70655/
2985 [70705]: https://github.com/rust-lang/rust/pull/70705/
2986 [69984]: https://github.com/rust-lang/rust/pull/69984/
2987 [69813]: https://github.com/rust-lang/rust/pull/69813/
2988 [69464]: https://github.com/rust-lang/rust/pull/69464/
2989 [68717]: https://github.com/rust-lang/rust/pull/68717/
2990 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2991 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2992 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2993 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2994 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2995 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2996 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2997 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2998 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2999 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3000 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3001 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3002 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3003 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3004 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3005 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3006 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3009 Version 1.44.1 (2020-06-18)
3010 ===========================
3012 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3013 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3014 * [Fix crashes when finding backtrace on macOS.][71397]
3015 * [Clippy applies lint levels into different files.][clippy/5356]
3017 [71397]: https://github.com/rust-lang/rust/issues/71397
3018 [73078]: https://github.com/rust-lang/rust/issues/73078
3019 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3020 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3023 Version 1.44.0 (2020-06-04)
3024 ==========================
3028 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3029 - [Added the `unused_braces` lint.][70081]
3031 **Syntax-only changes**
3033 - [Expansion-driven outline module parsing][69838]
3038 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3043 These are still rejected semantically, so you will likely receive an error but
3044 these changes can be seen and parsed by macros and conditional compilation.
3048 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3049 Additionally when in incremental mode rustc defaults to 256 codegen units.
3050 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3051 a panic is thrown.][67502]
3052 - [Added tier 3\* support for the `aarch64-unknown-none` and
3053 `aarch64-unknown-none-softfloat` targets.][68334]
3054 - [Added tier 3 support for `arm64-apple-tvos` and
3055 `x86_64-apple-tvos` targets.][68191]
3060 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3061 `vec![]` to be able to be used in `const` contexts.
3062 - [`convert::Infallible` now implements `Hash`.][70281]
3063 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3064 a `&mut OsStr`.][70048]
3065 - [Unicode 13 is now supported.][69929]
3066 - [`String` now implements `From<&mut str>`.][69661]
3067 - [`IoSlice` now implements `Copy`.][69403]
3068 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3069 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3070 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3071 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3072 integer types.][69373]
3076 - [`PathBuf::with_capacity`]
3077 - [`PathBuf::capacity`]
3078 - [`PathBuf::clear`]
3079 - [`PathBuf::reserve`]
3080 - [`PathBuf::reserve_exact`]
3081 - [`PathBuf::shrink_to_fit`]
3082 - [`f32::to_int_unchecked`]
3083 - [`f64::to_int_unchecked`]
3084 - [`Layout::align_to`]
3085 - [`Layout::pad_to_align`]
3087 - [`Layout::extend`]
3091 - [Added the `cargo tree` command which will print a tree graph of
3092 your dependencies.][cargo/8062] E.g.
3094 mdbook v0.3.2 (/Users/src/rust/mdbook)
3096 │ ├── html5ever v0.24.0
3098 │ │ │ └── cfg-if v0.1.9
3100 │ │ └── markup5ever v0.9.0
3101 │ │ ├── log v0.4.8 (*)
3103 │ │ │ └── phf_shared v0.7.24
3104 │ │ │ ├── siphasher v0.2.3
3105 │ │ │ └── unicase v1.4.2
3106 │ │ │ [build-dependencies]
3107 │ │ │ └── version_check v0.1.5
3110 You can also display dependencies on multiple versions of the same crate with
3111 `cargo tree -d` (short for `cargo tree --duplicates`).
3115 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3116 the version in the sidebar.][69494]
3120 - [Rustc now correctly generates static libraries on Windows GNU targets with
3121 the `.a` extension, rather than the previous `.lib`.][70937]
3122 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3123 - [The `file_name` property in JSON output of macro errors now points the actual
3124 source file rather than the previous format of `<NAME macros>`.][70969]
3125 **Note:** this may not point to a file that actually exists on the user's system.
3126 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3127 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3128 not allow zero initialization such as `NonZeroU8`.][66059] This was
3129 previously a warning.
3130 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3131 operator has been defined as a saturating operation.][71269] This was previously
3132 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3133 continue using the current behaviour, which may be desirable in rare performance
3134 sensitive situations.
3138 These changes provide no direct user facing benefits, but represent significant
3139 improvements to the internals and overall performance of rustc and
3142 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3143 - [Replace big JS dict with JSON parsing.][71250]
3145 [69373]: https://github.com/rust-lang/rust/pull/69373/
3146 [66059]: https://github.com/rust-lang/rust/pull/66059/
3147 [68191]: https://github.com/rust-lang/rust/pull/68191/
3148 [68899]: https://github.com/rust-lang/rust/pull/68899/
3149 [71147]: https://github.com/rust-lang/rust/pull/71147/
3150 [71250]: https://github.com/rust-lang/rust/pull/71250/
3151 [70937]: https://github.com/rust-lang/rust/pull/70937/
3152 [70969]: https://github.com/rust-lang/rust/pull/70969/
3153 [70632]: https://github.com/rust-lang/rust/pull/70632/
3154 [70281]: https://github.com/rust-lang/rust/pull/70281/
3155 [70345]: https://github.com/rust-lang/rust/pull/70345/
3156 [70048]: https://github.com/rust-lang/rust/pull/70048/
3157 [70081]: https://github.com/rust-lang/rust/pull/70081/
3158 [70156]: https://github.com/rust-lang/rust/pull/70156/
3159 [71269]: https://github.com/rust-lang/rust/pull/71269/
3160 [69838]: https://github.com/rust-lang/rust/pull/69838/
3161 [69929]: https://github.com/rust-lang/rust/pull/69929/
3162 [69661]: https://github.com/rust-lang/rust/pull/69661/
3163 [69778]: https://github.com/rust-lang/rust/pull/69778/
3164 [69494]: https://github.com/rust-lang/rust/pull/69494/
3165 [69403]: https://github.com/rust-lang/rust/pull/69403/
3166 [69033]: https://github.com/rust-lang/rust/pull/69033/
3167 [68692]: https://github.com/rust-lang/rust/pull/68692/
3168 [68334]: https://github.com/rust-lang/rust/pull/68334/
3169 [67502]: https://github.com/rust-lang/rust/pull/67502/
3170 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3171 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3172 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3173 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3174 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3175 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3176 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3177 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3178 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3179 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3180 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3181 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3182 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3185 Version 1.43.1 (2020-05-07)
3186 ===========================
3188 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3189 * [Fixed the stabilization of AVX-512 features.][71473]
3190 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3192 [71430]: https://github.com/rust-lang/rust/pull/71430
3193 [71473]: https://github.com/rust-lang/rust/issues/71473
3194 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3197 Version 1.43.0 (2020-04-23)
3198 ==========================
3202 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3203 the type inferred correctly.][68129]
3204 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3206 **Syntax only changes**
3207 - [Allow `type Foo: Ord` syntactically.][69361]
3208 - [Fuse associated and extern items up to defaultness.][69194]
3209 - [Syntactically allow `self` in all `fn` contexts.][68764]
3210 - [Merge `fn` syntax + cleanup item parsing.][68728]
3211 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3212 For example, you may now write:
3214 macro_rules! mac_trait {
3224 These are still rejected *semantically*, so you will likely receive an error but
3225 these changes can be seen and parsed by macros and
3226 conditional compilation.
3231 - [You can now pass multiple lint flags to rustc to override the previous
3232 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3233 everything in the `unused` lint group except `unused-variables` which
3234 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3235 everything in the `unused` lint group **including** `unused-variables` since
3236 the allow flag is specified before the deny flag (and therefore overridden).
3237 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3238 if they are available on `windows-gnu`.][67429]
3239 - [rustc now buffers errors/warnings printed in JSON.][69227]
3243 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3244 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3245 respectively.][69538] **Note** These conversions are only available when `N`
3247 - [You can now use associated constants on floats and integers directly, rather
3248 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3249 `f32::NAN` with no imports.
3250 - [`u8::is_ascii` is now `const`.][68984]
3251 - [`String` now implements `AsMut<str>`.][68742]
3252 - [Added the `primitive` module to `std` and `core`.][67637] This module
3253 reexports Rust's primitive types. This is mainly useful in macros
3254 where you want avoid these types being shadowed.
3255 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3256 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3260 - [`Once::is_completed`]
3265 - [`iter::once_with`]
3269 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3270 your environment.][cargo/7823]
3271 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3272 executable path when running integration tests or benchmarks.][cargo/7697]
3273 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3274 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3278 - [Certain checks in the `const_err` lint were deemed unrelated to const
3279 evaluation][69185], and have been moved to the `unconditional_panic` and
3280 `arithmetic_overflow` lints.
3285 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3286 has been a warning since 1.36.0.
3287 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3288 led to some instances being accepted, and now correctly emits a hard error.
3290 [69340]: https://github.com/rust-lang/rust/pull/69340
3294 These changes provide no direct user facing benefits, but represent significant
3295 improvements to the internals and overall performance of `rustc` and
3298 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3299 - [Improved how rustc generates drop code.][67332]
3300 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3301 - [traits: preallocate 2 Vecs of known initial size][69022]
3302 - [Avoid exponential behaviour when relating types][68772]
3303 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3304 - [Improve performance of coherence checks][68966]
3305 - [Deduplicate types in the generator witness][68672]
3306 - [Invert control in struct_lint_level.][68725]
3308 [67332]: https://github.com/rust-lang/rust/pull/67332/
3309 [67429]: https://github.com/rust-lang/rust/pull/67429/
3310 [67637]: https://github.com/rust-lang/rust/pull/67637/
3311 [67642]: https://github.com/rust-lang/rust/pull/67642/
3312 [67878]: https://github.com/rust-lang/rust/pull/67878/
3313 [67885]: https://github.com/rust-lang/rust/pull/67885/
3314 [68129]: https://github.com/rust-lang/rust/pull/68129/
3315 [68672]: https://github.com/rust-lang/rust/pull/68672/
3316 [68725]: https://github.com/rust-lang/rust/pull/68725/
3317 [68728]: https://github.com/rust-lang/rust/pull/68728/
3318 [68738]: https://github.com/rust-lang/rust/pull/68738/
3319 [68742]: https://github.com/rust-lang/rust/pull/68742/
3320 [68764]: https://github.com/rust-lang/rust/pull/68764/
3321 [68772]: https://github.com/rust-lang/rust/pull/68772/
3322 [68943]: https://github.com/rust-lang/rust/pull/68943/
3323 [68952]: https://github.com/rust-lang/rust/pull/68952/
3324 [68966]: https://github.com/rust-lang/rust/pull/68966/
3325 [68984]: https://github.com/rust-lang/rust/pull/68984/
3326 [69022]: https://github.com/rust-lang/rust/pull/69022/
3327 [69185]: https://github.com/rust-lang/rust/pull/69185/
3328 [69194]: https://github.com/rust-lang/rust/pull/69194/
3329 [69201]: https://github.com/rust-lang/rust/pull/69201/
3330 [69227]: https://github.com/rust-lang/rust/pull/69227/
3331 [69548]: https://github.com/rust-lang/rust/pull/69548/
3332 [69256]: https://github.com/rust-lang/rust/pull/69256/
3333 [69361]: https://github.com/rust-lang/rust/pull/69361/
3334 [69366]: https://github.com/rust-lang/rust/pull/69366/
3335 [69538]: https://github.com/rust-lang/rust/pull/69538/
3336 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3337 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3338 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3339 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3340 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3341 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3342 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3343 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3346 Version 1.42.0 (2020-03-12)
3347 ==========================
3351 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3353 fn foo(words: &[&str]) {
3355 ["Hello", "World", "!", ..] => println!("Hello World!"),
3356 ["Foo", "Bar", ..] => println!("Baz"),
3357 rest => println!("{:?}", rest),
3361 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3362 that you can create an enum that has the exact layout and ABI of the type
3364 - [You can now use outer attribute procedural macros on inline modules.][64273]
3365 - [There are some *syntax-only* changes:][67131]
3366 - `default` is syntactically allowed before items in `trait` definitions.
3367 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3368 leave out their bodies in favor of `;`.
3369 - Bounds on associated types in `impl`s are now syntactically allowed
3370 (e.g. `type Foo: Ord;`).
3371 - `...` (the C-variadic type) may occur syntactically directly as the type of
3372 any function parameter.
3374 These are still rejected *semantically*, so you will likely receive an error
3375 but these changes can be seen and parsed by procedural macros and
3376 conditional compilation.
3380 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3381 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3382 - [`Option::{expect,unwrap}` and
3383 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3384 pointing to the location where they were called, rather than
3385 `core`'s internals. ][67887]
3387 \* Refer to Rust's [platform support page][platform-support-doc] for more
3388 information on Rust's tiered platform support.
3392 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3393 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3394 to implement `Sized`.][67935]
3395 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3396 - [`Layout::new` is now `const`.][66254]
3397 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3402 - [`CondVar::wait_while`]
3403 - [`CondVar::wait_timeout_while`]
3405 - [`DebugMap::value`]
3406 - [`ManuallyDrop::take`]
3408 - [`ptr::slice_from_raw_parts_mut`]
3409 - [`ptr::slice_from_raw_parts`]
3413 - [You no longer need to include `extern crate proc_macro;` to be able to
3414 `use proc_macro;` in the `2018` edition.][cargo/7700]
3418 - [`Error::description` has been deprecated, and its use will now produce a
3419 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3421 [68253]: https://github.com/rust-lang/rust/pull/68253/
3422 [68348]: https://github.com/rust-lang/rust/pull/68348/
3423 [67935]: https://github.com/rust-lang/rust/pull/67935/
3424 [68339]: https://github.com/rust-lang/rust/pull/68339/
3425 [68122]: https://github.com/rust-lang/rust/pull/68122/
3426 [64273]: https://github.com/rust-lang/rust/pull/64273/
3427 [67712]: https://github.com/rust-lang/rust/pull/67712/
3428 [67887]: https://github.com/rust-lang/rust/pull/67887/
3429 [67131]: https://github.com/rust-lang/rust/pull/67131/
3430 [67233]: https://github.com/rust-lang/rust/pull/67233/
3431 [66899]: https://github.com/rust-lang/rust/pull/66899/
3432 [66919]: https://github.com/rust-lang/rust/pull/66919/
3433 [66254]: https://github.com/rust-lang/rust/pull/66254/
3434 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3435 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3436 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3437 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3438 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3439 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3440 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3441 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3442 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3445 Version 1.41.1 (2020-02-27)
3446 ===========================
3448 * [Always check types of static items][69145]
3449 * [Always check lifetime bounds of `Copy` impls][69145]
3450 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3452 [69225]: https://github.com/rust-lang/rust/issues/69225
3453 [69145]: https://github.com/rust-lang/rust/pull/69145
3456 Version 1.41.0 (2020-01-30)
3457 ===========================
3462 - [You can now pass type parameters to foreign items when implementing
3463 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3464 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3465 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3466 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3467 - [You can now use any valid identifier in a `format_args` macro.][66847]
3468 Previously identifiers starting with an underscore were not allowed.
3469 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3470 enum variants.][66183] These are still rejected semantically, but
3471 can be seen and parsed by procedural macros and conditional compilation.
3472 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3473 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3474 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3476 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3481 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3482 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3483 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3484 - [You can now pass an arguments file passing the `@path` syntax
3485 to rustc.][66172] Note that the format differs somewhat from what is
3486 found in other tooling; please see [the documentation][argfile-docs] for
3488 - [You can now provide `--extern` flag without a path, indicating that it is
3489 available from the search path or specified with an `-L` flag.][64882]
3491 \* Refer to Rust's [platform support page][platform-support-doc] for more
3492 information on Rust's tiered platform support.
3494 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3499 - [The `core::panic` module is now stable.][66771] It was already stable
3501 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3502 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3503 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3508 - [`Result::map_or`]
3509 - [`Result::map_or_else`]
3510 - [`std::rc::Weak::weak_count`]
3511 - [`std::rc::Weak::strong_count`]
3512 - [`std::sync::Weak::weak_count`]
3513 - [`std::sync::Weak::strong_count`]
3518 - [Cargo will now document all the private items for binary crates
3519 by default.][cargo/7593]
3520 - [`cargo-install` will now reinstall the package if it detects that it is out
3521 of date.][cargo/7560]
3522 - [Cargo.lock now uses a more git friendly format that should help to reduce
3523 merge conflicts.][cargo/7579]
3524 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3525 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3526 optimisation level to `2` for debug builds. You can also use
3527 `[profile.<profile>.build-override]` to override build scripts and
3533 - [You can now specify `edition` in documentation code blocks to compile the block
3534 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3535 should be compiled the 2018 edition of Rust.
3536 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3537 current theme with `--check-theme`.][54733]
3538 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3543 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3544 Apple targets.][apple-32bit-drop] This means that the source code is still
3545 available to build, but the targets are no longer being tested and release
3546 binaries for those platforms will no longer be distributed by the Rust project.
3547 Please refer to the linked blog post for more information.
3549 [54733]: https://github.com/rust-lang/rust/pull/54733/
3550 [61351]: https://github.com/rust-lang/rust/pull/61351/
3551 [62514]: https://github.com/rust-lang/rust/pull/62514/
3552 [67255]: https://github.com/rust-lang/rust/pull/67255/
3553 [66661]: https://github.com/rust-lang/rust/pull/66661/
3554 [66771]: https://github.com/rust-lang/rust/pull/66771/
3555 [66847]: https://github.com/rust-lang/rust/pull/66847/
3556 [66238]: https://github.com/rust-lang/rust/pull/66238/
3557 [66277]: https://github.com/rust-lang/rust/pull/66277/
3558 [66325]: https://github.com/rust-lang/rust/pull/66325/
3559 [66172]: https://github.com/rust-lang/rust/pull/66172/
3560 [66183]: https://github.com/rust-lang/rust/pull/66183/
3561 [65879]: https://github.com/rust-lang/rust/pull/65879/
3562 [65013]: https://github.com/rust-lang/rust/pull/65013/
3563 [64882]: https://github.com/rust-lang/rust/pull/64882/
3564 [64325]: https://github.com/rust-lang/rust/pull/64325/
3565 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3566 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3567 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3568 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3569 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3570 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3571 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3572 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3573 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3574 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3575 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3577 Version 1.40.0 (2019-12-19)
3578 ===========================
3582 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3583 `const` contexts.][65188] e.g.
3586 pub struct Point(i32, i32);
3588 const ORIGIN: Point = {
3589 let constructor = Point;
3595 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3596 indicate that there may be variants or fields added in the future.][64639]
3597 For example this requires adding a wild-card branch (`_ => {}`) to any match
3598 statements on a non-exhaustive `enum`. [(RFC 2008)]
3599 - [You can now use function-like procedural macros in `extern` blocks and in
3600 type positions.][63931] e.g. `type Generated = macro!();`
3601 - [Function-like and attribute procedural macros can now emit
3602 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3603 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3604 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3605 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3609 - [Added tier 3 support\* for the
3610 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3611 - [Added tier 3 support for the
3612 `aarch64-unknown-none-softfloat` target.][64589]
3613 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3614 `mips64el-unknown-linux-muslabi64` targets.][65843]
3616 \* Refer to Rust's [platform support page][platform-support-doc] for more
3617 information on Rust's tiered platform support.
3621 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3625 - [`BTreeMap::get_key_value`]
3626 - [`HashMap::get_key_value`]
3627 - [`Option::as_deref_mut`]
3628 - [`Option::as_deref`]
3629 - [`Option::flatten`]
3630 - [`UdpSocket::peer_addr`]
3631 - [`f32::to_be_bytes`]
3632 - [`f32::to_le_bytes`]
3633 - [`f32::to_ne_bytes`]
3634 - [`f64::to_be_bytes`]
3635 - [`f64::to_le_bytes`]
3636 - [`f64::to_ne_bytes`]
3637 - [`f32::from_be_bytes`]
3638 - [`f32::from_le_bytes`]
3639 - [`f32::from_ne_bytes`]
3640 - [`f64::from_be_bytes`]
3641 - [`f64::from_le_bytes`]
3642 - [`f64::from_ne_bytes`]
3649 - [Cargo will now always display warnings, rather than only on
3650 fresh builds.][cargo/7450]
3651 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3652 now produce an error.][cargo/7507] Previously these flags were ignored.
3653 - [You can now publish `dev-dependencies` without including
3654 a `version`.][cargo/7333]
3658 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3659 when running documentation tests with `rustdoc`.][63803]
3663 - [As previously announced, any previous NLL warnings in the 2015 edition are
3664 now hard errors.][64221]
3665 - [The `include!` macro will now warn if it failed to include the
3666 entire file.][64284] The `include!` macro unintentionally only includes the
3667 first _expression_ in a file, and this can be unintuitive. This will become
3668 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3669 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3670 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3671 or `extern` blocks now correctly emits a hard error.
3673 [65294]: https://github.com/rust-lang/rust/pull/65294/
3674 [66103]: https://github.com/rust-lang/rust/pull/66103/
3675 [65843]: https://github.com/rust-lang/rust/pull/65843/
3676 [65188]: https://github.com/rust-lang/rust/pull/65188/
3677 [65092]: https://github.com/rust-lang/rust/pull/65092/
3678 [64589]: https://github.com/rust-lang/rust/pull/64589/
3679 [64639]: https://github.com/rust-lang/rust/pull/64639/
3680 [64221]: https://github.com/rust-lang/rust/pull/64221/
3681 [64284]: https://github.com/rust-lang/rust/pull/64284/
3682 [63931]: https://github.com/rust-lang/rust/pull/63931/
3683 [64035]: https://github.com/rust-lang/rust/pull/64035/
3684 [63674]: https://github.com/rust-lang/rust/pull/63674/
3685 [63803]: https://github.com/rust-lang/rust/pull/63803/
3686 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3687 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3688 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3689 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3690 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3691 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3692 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3693 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3694 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3695 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3696 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3697 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3698 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3699 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3700 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3701 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3702 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3703 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3704 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3705 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3706 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3707 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3708 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3709 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3710 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3713 Version 1.39.0 (2019-11-07)
3714 ===========================
3718 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3719 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3720 - [You can now use certain attributes on function, closure, and function pointer
3721 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3722 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3723 attributes applied to items. e.g.
3726 #[cfg(windows)] slice: &[u16],
3727 #[cfg(not(windows))] slice: &[u8],
3732 - [You can now take shared references to bind-by-move patterns in the `if` guards
3733 of `match` arms.][63118] e.g.
3736 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3740 // ---- `nums` is bound by move.
3741 if nums.iter().sum::<u8>() == 10
3742 // ^------ `.iter()` implicitly takes a reference to `nums`.
3745 // ----------- Legal as `nums` was bound by move and so we have ownership.
3747 _ => unreachable!(),
3756 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3757 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3758 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3759 **Note** Cargo currently doesn't use this feature. Refer to
3760 [cargo#7315][cargo/7315] to track this feature's progress.
3761 - [You can now pass `--show-output` argument to test binaries to print the
3762 output of successful tests.][62600]
3765 \* Refer to Rust's [platform support page][platform-support-doc] for more
3766 information on Rust's tiered platform support.
3770 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3771 - [`LinkedList::new` is now a `const` function.][63684]
3772 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3773 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3774 now `const`.][63786]
3778 - [`Pin::into_inner`]
3779 - [`Instant::checked_duration_since`]
3780 - [`Instant::saturating_duration_since`]
3784 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3785 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3786 `--all` is now deprecated.
3790 - [You can now pass `-Clinker` to rustdoc to control the linker used
3791 for compiling doctests.][63834]
3795 - [Code that was previously accepted by the old borrow checker, but rejected by
3796 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3797 previously a warning, and will also become a hard error in the Rust 2015
3798 edition in the 1.40.0 release.
3799 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3800 run tests.][63827] This should improve performance when running a large
3802 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3803 recommended to use the `?` operator instead.
3804 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3807 [62600]: https://github.com/rust-lang/rust/pull/62600/
3808 [62672]: https://github.com/rust-lang/rust/pull/62672/
3809 [63118]: https://github.com/rust-lang/rust/pull/63118/
3810 [63209]: https://github.com/rust-lang/rust/pull/63209/
3811 [63402]: https://github.com/rust-lang/rust/pull/63402/
3812 [63565]: https://github.com/rust-lang/rust/pull/63565/
3813 [63595]: https://github.com/rust-lang/rust/pull/63595/
3814 [63684]: https://github.com/rust-lang/rust/pull/63684/
3815 [63698]: https://github.com/rust-lang/rust/pull/63698/
3816 [63770]: https://github.com/rust-lang/rust/pull/63770/
3817 [63786]: https://github.com/rust-lang/rust/pull/63786/
3818 [63827]: https://github.com/rust-lang/rust/pull/63827/
3819 [63834]: https://github.com/rust-lang/rust/pull/63834/
3820 [64010]: https://github.com/rust-lang/rust/pull/64010/
3821 [64028]: https://github.com/rust-lang/rust/pull/64028/
3822 [64334]: https://github.com/rust-lang/rust/pull/64334/
3823 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3824 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3825 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3826 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3827 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3828 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3830 Version 1.38.0 (2019-09-26)
3831 ==========================
3835 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3836 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3840 - [Added pipelined compilation support to `rustc`.][62766] This will
3841 improve compilation times in some cases. For further information please refer
3842 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3843 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3844 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3845 `x86_64-uwp-windows-msvc` targets.][60260]
3846 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3847 `armv7-unknown-linux-musleabi` targets.][63107]
3848 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3849 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3850 - [Upgraded to LLVM 9.][62592]
3852 \* Refer to Rust's [platform support page][platform-support-doc] for more
3853 information on Rust's tiered platform support.
3857 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3858 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3859 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3860 is available at `std::clone::Clone`). This also makes all built-in macros
3861 available in `std`/`core` root. e.g. `std::include_bytes!`.
3862 - [`str::Chars` now implements `Debug`.][63000]
3863 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3864 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3865 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3866 - [Added euclidean remainder and division operations (`div_euclid`,
3867 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3868 `overflowing`, and `wrapping` versions are available for all
3870 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3871 `PartialEq`.][61491]
3872 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3876 - [`<*const T>::cast`]
3877 - [`<*mut T>::cast`]
3878 - [`Duration::as_secs_f32`]
3879 - [`Duration::as_secs_f64`]
3880 - [`Duration::div_f32`]
3881 - [`Duration::div_f64`]
3882 - [`Duration::from_secs_f32`]
3883 - [`Duration::from_secs_f64`]
3884 - [`Duration::mul_f32`]
3885 - [`Duration::mul_f64`]
3886 - [`any::type_name`]
3890 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3891 - [You can now pass the `--features` option multiple times to enable
3892 multiple features.][cargo/7084]
3897 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3901 - [`rustc` will now warn about some incorrect uses of
3902 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3906 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3908 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3909 issues][62896] with certain crates such as libc.
3911 [60260]: https://github.com/rust-lang/rust/pull/60260/
3912 [61457]: https://github.com/rust-lang/rust/pull/61457/
3913 [61491]: https://github.com/rust-lang/rust/pull/61491/
3914 [61884]: https://github.com/rust-lang/rust/pull/61884/
3915 [61953]: https://github.com/rust-lang/rust/pull/61953/
3916 [62042]: https://github.com/rust-lang/rust/pull/62042/
3917 [62528]: https://github.com/rust-lang/rust/pull/62528/
3918 [62583]: https://github.com/rust-lang/rust/pull/62583/
3919 [62735]: https://github.com/rust-lang/rust/pull/62735/
3920 [62766]: https://github.com/rust-lang/rust/pull/62766/
3921 [62784]: https://github.com/rust-lang/rust/pull/62784/
3922 [62592]: https://github.com/rust-lang/rust/pull/62592/
3923 [62785]: https://github.com/rust-lang/rust/issues/62785/
3924 [62814]: https://github.com/rust-lang/rust/pull/62814/
3925 [62896]: https://github.com/rust-lang/rust/issues/62896/
3926 [63000]: https://github.com/rust-lang/rust/pull/63000/
3927 [63056]: https://github.com/rust-lang/rust/pull/63056/
3928 [63107]: https://github.com/rust-lang/rust/pull/63107/
3929 [63346]: https://github.com/rust-lang/rust/pull/63346/
3930 [63421]: https://github.com/rust-lang/rust/pull/63421/
3931 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3932 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3933 [63048]: https://github.com/rust-lang/rust/pull/63048
3934 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3935 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3936 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3937 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3938 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3939 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3940 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3941 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3942 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3943 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3944 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3945 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3946 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3948 Version 1.37.0 (2019-08-15)
3949 ==========================
3953 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3954 [`Box`][62228], or an [array][62235] and unused.
3955 - [You can now use the `cfg` and `cfg_attr` attributes on
3956 generic parameters.][61547]
3957 - [You can now use enum variants through type alias.][61682] e.g. You can
3958 write the following:
3960 type MyOption = Option<u8>;
3962 fn increment_or_zero(x: MyOption) -> u8 {
3964 MyOption::Some(y) => y + 1,
3965 MyOption::None => 0,
3969 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3970 `const _: u32 = 5;`.
3971 - [You can now use `#[repr(align(X)]` on enums.][61229]
3972 - [The `?` Kleene macro operator is now available in the
3973 2015 edition.][60932]
3977 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3978 and `-C profile-use` flags.][61268] For more information on how to use profile
3979 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3980 - [The `rust-lldb` wrapper script should now work again.][61827]
3984 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3988 - [`BufReader::buffer`]
3989 - [`BufWriter::buffer`]
3990 - [`Cell::from_mut`]
3991 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3992 - [`DoubleEndedIterator::nth_back`]
3994 - [`Wrapping::reverse_bits`]
3995 - [`i128::reverse_bits`]
3996 - [`i16::reverse_bits`]
3997 - [`i32::reverse_bits`]
3998 - [`i64::reverse_bits`]
3999 - [`i8::reverse_bits`]
4000 - [`isize::reverse_bits`]
4001 - [`slice::copy_within`]
4002 - [`u128::reverse_bits`]
4003 - [`u16::reverse_bits`]
4004 - [`u32::reverse_bits`]
4005 - [`u64::reverse_bits`]
4006 - [`u8::reverse_bits`]
4007 - [`usize::reverse_bits`]
4011 - [`Cargo.lock` files are now included by default when publishing executable crates
4012 with executables.][cargo/7026]
4013 - [You can now specify `default-run="foo"` in `[package]` to specify the
4014 default executable to use for `cargo run`.][cargo/7056]
4021 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4022 Please transition your code to using the `..=` syntax for inclusive
4024 - [Using a trait object without the `dyn` will now warn by default.][61203]
4025 Please transition your code to use `dyn Trait` for trait objects instead.
4027 [62228]: https://github.com/rust-lang/rust/pull/62228/
4028 [62235]: https://github.com/rust-lang/rust/pull/62235/
4029 [61802]: https://github.com/rust-lang/rust/pull/61802/
4030 [61827]: https://github.com/rust-lang/rust/pull/61827/
4031 [61547]: https://github.com/rust-lang/rust/pull/61547/
4032 [61682]: https://github.com/rust-lang/rust/pull/61682/
4033 [61268]: https://github.com/rust-lang/rust/pull/61268/
4034 [61342]: https://github.com/rust-lang/rust/pull/61342/
4035 [61347]: https://github.com/rust-lang/rust/pull/61347/
4036 [61100]: https://github.com/rust-lang/rust/pull/61100/
4037 [61203]: https://github.com/rust-lang/rust/pull/61203/
4038 [61229]: https://github.com/rust-lang/rust/pull/61229/
4039 [60932]: https://github.com/rust-lang/rust/pull/60932/
4040 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4041 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4042 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4043 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4044 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4045 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4046 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4047 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4048 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4049 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4050 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4051 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4052 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4053 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4054 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4055 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4056 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4057 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4058 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4059 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4060 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4061 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4062 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4065 Version 1.36.0 (2019-07-04)
4066 ==========================
4070 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4071 - [The order of traits in trait objects no longer affects the semantics of that
4072 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4073 `dyn fmt::Debug + Send`, where this was previously not the case.
4077 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4078 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4079 - [`mem::needs_drop` is now available as a const fn.][60364]
4080 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4081 - [`String` now implements `BorrowMut<str>`.][60404]
4082 - [`io::Cursor` now implements `Default`.][60234]
4083 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4084 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4085 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4086 environment has access to heap memory allocation.
4087 - [`String` now implements `From<&String>`.][59825]
4088 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4089 return a tuple of each argument when there is multiple arguments.
4090 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4095 - [`VecDeque::rotate_left`]
4096 - [`VecDeque::rotate_right`]
4097 - [`Iterator::copied`]
4099 - [`io::IoSliceMut`]
4100 - [`Read::read_vectored`]
4101 - [`Write::write_vectored`]
4102 - [`str::as_mut_ptr`]
4103 - [`mem::MaybeUninit`]
4104 - [`pointer::align_offset`]
4105 - [`future::Future`]
4107 - [`task::RawWaker`]
4108 - [`task::RawWakerVTable`]
4114 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4115 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4117 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4121 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4128 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4129 longer recommended, and will be deprecated in 1.39.0.
4131 [60318]: https://github.com/rust-lang/rust/pull/60318/
4132 [60364]: https://github.com/rust-lang/rust/pull/60364/
4133 [60370]: https://github.com/rust-lang/rust/pull/60370/
4134 [60404]: https://github.com/rust-lang/rust/pull/60404/
4135 [60234]: https://github.com/rust-lang/rust/pull/60234/
4136 [60244]: https://github.com/rust-lang/rust/pull/60244/
4137 [58623]: https://github.com/rust-lang/rust/pull/58623/
4138 [59648]: https://github.com/rust-lang/rust/pull/59648/
4139 [59675]: https://github.com/rust-lang/rust/pull/59675/
4140 [59825]: https://github.com/rust-lang/rust/pull/59825/
4141 [59826]: https://github.com/rust-lang/rust/pull/59826/
4142 [59445]: https://github.com/rust-lang/rust/pull/59445/
4143 [59114]: https://github.com/rust-lang/rust/pull/59114/
4144 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4145 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4146 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4147 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4148 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4149 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4150 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4151 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4152 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4153 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4154 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4155 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4156 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4157 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4158 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4159 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4160 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4161 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4162 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4163 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4166 Version 1.35.0 (2019-05-23)
4167 ==========================
4171 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4172 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4173 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4175 unsafe fn call_unsafe(func: unsafe fn()) {
4180 unsafe { call_unsafe(|| {}); }
4187 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4188 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4189 - [Added the `wasm32-unknown-wasi` target.][59464]
4194 - [`Thread` will now show its ID in `Debug` output.][59460]
4195 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4196 - [`alloc::System` now implements `Default`.][59451]
4197 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4199 - [`char::{ToLowercase, ToUppercase}` now
4200 implement `ExactSizeIterator`.][58778]
4201 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4202 - [Removed the `Read` trait bounds
4203 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4204 - [You can now call the `dbg!` macro without any parameters to print the file
4205 and line where it is called.][57847]
4206 - [In place ASCII case conversions are now up to 4× faster.][59283]
4207 e.g. `str::make_ascii_lowercase`
4208 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4215 - [`RefCell::replace_with`]
4216 - [`RefCell::map_split`]
4218 - [`Range::contains`]
4219 - [`RangeFrom::contains`]
4220 - [`RangeTo::contains`]
4221 - [`RangeInclusive::contains`]
4222 - [`RangeToInclusive::contains`]
4223 - [`Option::copied`]
4227 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4228 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4233 - [The Rust toolchain is now available natively for musl based distros.][58575]
4235 [59460]: https://github.com/rust-lang/rust/pull/59460/
4236 [59464]: https://github.com/rust-lang/rust/pull/59464/
4237 [59500]: https://github.com/rust-lang/rust/pull/59500/
4238 [59512]: https://github.com/rust-lang/rust/pull/59512/
4239 [59580]: https://github.com/rust-lang/rust/pull/59580/
4240 [59283]: https://github.com/rust-lang/rust/pull/59283/
4241 [59451]: https://github.com/rust-lang/rust/pull/59451/
4242 [59076]: https://github.com/rust-lang/rust/pull/59076/
4243 [58778]: https://github.com/rust-lang/rust/pull/58778/
4244 [58717]: https://github.com/rust-lang/rust/pull/58717/
4245 [58369]: https://github.com/rust-lang/rust/pull/58369/
4246 [58423]: https://github.com/rust-lang/rust/pull/58423/
4247 [58080]: https://github.com/rust-lang/rust/pull/58080/
4248 [57847]: https://github.com/rust-lang/rust/pull/57847/
4249 [58575]: https://github.com/rust-lang/rust/pull/58575
4250 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4251 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4252 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4253 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4254 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4255 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4256 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4257 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4258 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4259 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4260 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4261 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4263 Version 1.34.2 (2019-05-14)
4264 ===========================
4266 * [Destabilize the `Error::type_id` function due to a security
4267 vulnerability][60785] ([CVE-2019-12083])
4269 [60785]: https://github.com/rust-lang/rust/pull/60785
4270 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4272 Version 1.34.1 (2019-04-25)
4273 ===========================
4275 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4276 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4277 * [Fix Clippy panic when checking some macros][clippy/3805]
4279 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4280 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4281 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4283 Version 1.34.0 (2019-04-11)
4284 ==========================
4288 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4289 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4291 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4292 `#[attr{}]` procedural macros.][57367]
4293 - [You can now write `extern crate self as foo;`][57407] to import your
4294 crate's root into the extern prelude.
4299 - [You can now target `riscv64imac-unknown-none-elf` and
4300 `riscv64gc-unknown-none-elf`.][58406]
4301 - [You can now enable linker plugin LTO optimisations with
4302 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4303 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4305 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4310 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4311 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4312 the `Hash` trait to create an iterator.
4313 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4314 methods.][58421] Most notably you no longer require the `Ord` trait to create
4316 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4317 for all numeric types.][58044]
4318 - [Indexing a `str` is now generic over all types that
4319 implement `SliceIndex<str>`.][57604]
4320 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4321 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4322 produce a warning if their returning type is unused.
4323 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4324 `overflowing_pow` are now available for all numeric types.][57873] These are
4325 equivalent to methods such as `wrapping_add` for the `pow` operation.
4333 * [`Error::type_id`]
4334 * [`atomic::AtomicI16`]
4335 * [`atomic::AtomicI32`]
4336 * [`atomic::AtomicI64`]
4337 * [`atomic::AtomicI8`]
4338 * [`atomic::AtomicU16`]
4339 * [`atomic::AtomicU32`]
4340 * [`atomic::AtomicU64`]
4341 * [`atomic::AtomicU8`]
4342 * [`convert::Infallible`]
4343 * [`convert::TryFrom`]
4344 * [`convert::TryInto`]
4346 * [`iter::successors`]
4347 * [`num::NonZeroI128`]
4348 * [`num::NonZeroI16`]
4349 * [`num::NonZeroI32`]
4350 * [`num::NonZeroI64`]
4351 * [`num::NonZeroI8`]
4352 * [`num::NonZeroIsize`]
4353 * [`slice::sort_by_cached_key`]
4354 * [`str::escape_debug`]
4355 * [`str::escape_default`]
4356 * [`str::escape_unicode`]
4357 * [`str::split_ascii_whitespace`]
4360 * [`Instant::checked_add`]
4361 * [`Instant::checked_sub`]
4362 * [`SystemTime::checked_add`]
4363 * [`SystemTime::checked_sub`]
4367 - [You can now use alternative registries to crates.io.][cargo/6654]
4371 - [You can now use the `?` operator in your documentation tests without manually
4372 adding `fn main() -> Result<(), _> {}`.][56470]
4376 - [`Command::before_exec` is being replaced by the unsafe method
4377 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4378 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4379 can now use `const` functions in `static` variables.
4381 [58370]: https://github.com/rust-lang/rust/pull/58370/
4382 [58406]: https://github.com/rust-lang/rust/pull/58406/
4383 [58421]: https://github.com/rust-lang/rust/pull/58421/
4384 [58166]: https://github.com/rust-lang/rust/pull/58166/
4385 [58044]: https://github.com/rust-lang/rust/pull/58044/
4386 [58057]: https://github.com/rust-lang/rust/pull/58057/
4387 [58059]: https://github.com/rust-lang/rust/pull/58059/
4388 [57809]: https://github.com/rust-lang/rust/pull/57809/
4389 [57873]: https://github.com/rust-lang/rust/pull/57873/
4390 [57604]: https://github.com/rust-lang/rust/pull/57604/
4391 [57367]: https://github.com/rust-lang/rust/pull/57367/
4392 [57407]: https://github.com/rust-lang/rust/pull/57407/
4393 [57425]: https://github.com/rust-lang/rust/pull/57425/
4394 [57106]: https://github.com/rust-lang/rust/pull/57106/
4395 [56470]: https://github.com/rust-lang/rust/pull/56470/
4396 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4397 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4398 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4399 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4400 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4401 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4402 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4403 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4404 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4405 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4406 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4407 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4408 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4409 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4410 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4411 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4412 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4413 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4414 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4415 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4416 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4417 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4418 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4419 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4420 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4421 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4422 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4423 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4424 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4425 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4426 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4429 Version 1.33.0 (2019-02-28)
4430 ==========================
4434 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4435 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4436 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4437 E.g. You can have match statement on a `u8` that covers `0..=255` and
4438 you would no longer be required to have a `_ => unreachable!()` case.
4439 - [You can now have multiple patterns in `if let` and `while let`
4440 expressions.][57532] You can do this with the same syntax as a `match`
4450 let state = Creature::Crab("Ferris");
4452 if let Creature::Crab(name) | Creature::Person(name) = state {
4453 println!("This creature's name is: {}", name);
4457 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4458 this feature will by default produce a warning as this behaviour can be
4459 unintuitive. E.g. `if let _ = 5 {}`
4460 - [You can now use `let` bindings, assignments, expression statements,
4461 and irrefutable pattern destructuring in const functions.][57175]
4462 - [You can now call unsafe const functions.][57067] E.g.
4464 const unsafe fn foo() -> i32 { 5 }
4465 const fn bar() -> i32 {
4469 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4470 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4471 - [You can now specify a specific alignment with the `#[repr(packed)]`
4472 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4473 with an alignment of 2 bytes and a size of 6 bytes.
4474 - [You can now import an item from a module as an `_`.][56303] This allows you to
4475 import a trait's impls, and not have the name in the namespace. E.g.
4477 use std::io::Read as _;
4479 // Allowed as there is only one `Read` in the module.
4482 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4486 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4487 command line argument.][56351]
4488 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4489 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4490 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4491 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4492 information on Rust's platform support.
4493 - [Added support for the `thumbv7neon-linux-androideabi` and
4494 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4495 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4499 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4500 functions for all numeric types.][57566]
4501 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4502 are now `const` functions for all numeric types.][57105]
4503 - [The methods `is_positive` and `is_negative` are now `const` functions for
4504 all signed numeric types.][57105]
4505 - [The `get` method for all `NonZero` types is now `const`.][57167]
4506 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4507 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4508 numeric types.][57234]
4509 - [`Ipv4Addr::new` is now a `const` function][57234]
4513 - [`unix::FileExt::read_exact_at`]
4514 - [`unix::FileExt::write_all_at`]
4515 - [`Option::transpose`]
4516 - [`Result::transpose`]
4517 - [`convert::identity`]
4520 - [`marker::PhantomPinned`]
4521 - [`Vec::resize_with`]
4522 - [`VecDeque::resize_with`]
4523 - [`Duration::as_millis`]
4524 - [`Duration::as_micros`]
4525 - [`Duration::as_nanos`]
4530 - [You can now publish crates that require a feature flag to compile with
4531 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4532 - [Cargo should now rebuild a crate if a file was modified during the initial
4537 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4538 are now deprecated in the standard library, and their usage will now produce a warning.
4539 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4541 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4543 - [Libtest no longer creates a new thread for each test when
4544 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4546 [56243]: https://github.com/rust-lang/rust/pull/56243
4547 [56303]: https://github.com/rust-lang/rust/pull/56303/
4548 [56351]: https://github.com/rust-lang/rust/pull/56351/
4549 [56362]: https://github.com/rust-lang/rust/pull/56362
4550 [56642]: https://github.com/rust-lang/rust/pull/56642/
4551 [56769]: https://github.com/rust-lang/rust/pull/56769/
4552 [56805]: https://github.com/rust-lang/rust/pull/56805
4553 [56947]: https://github.com/rust-lang/rust/pull/56947/
4554 [57049]: https://github.com/rust-lang/rust/pull/57049/
4555 [57067]: https://github.com/rust-lang/rust/pull/57067/
4556 [57105]: https://github.com/rust-lang/rust/pull/57105
4557 [57130]: https://github.com/rust-lang/rust/pull/57130/
4558 [57167]: https://github.com/rust-lang/rust/pull/57167/
4559 [57175]: https://github.com/rust-lang/rust/pull/57175/
4560 [57234]: https://github.com/rust-lang/rust/pull/57234/
4561 [57332]: https://github.com/rust-lang/rust/pull/57332/
4562 [57465]: https://github.com/rust-lang/rust/pull/57465/
4563 [57532]: https://github.com/rust-lang/rust/pull/57532/
4564 [57535]: https://github.com/rust-lang/rust/pull/57535/
4565 [57566]: https://github.com/rust-lang/rust/pull/57566/
4566 [57615]: https://github.com/rust-lang/rust/pull/57615/
4567 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4568 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4569 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4570 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4571 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4572 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4573 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4574 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4575 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4576 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4577 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4578 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4579 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4580 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4581 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4582 [platform-support]: https://forge.rust-lang.org/platform-support.html
4584 Version 1.32.0 (2019-01-17)
4585 ==========================
4590 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4591 operator allows you to specify zero or one repetitions similar to the `*` and
4593 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4594 now always resolve to the item (`enum`, `struct`, etc.) available in the
4595 module if present, before resolving to a external crate or an item the prelude.][56759]
4598 enum Color { Red, Green, Blue }
4604 - [You can now match against `PhantomData<T>` types.][55837]
4605 - [You can now match against literals in macros with the `literal`
4606 specifier.][56072] This will match against a literal of any type.
4607 E.g. `1`, `'A'`, `"Hello World"`
4608 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4610 struct Point(i32, i32);
4613 pub fn new(x: i32, y: i32) -> Self {
4617 pub fn is_origin(&self) -> bool {
4625 - [Self can also now be used in type definitions.][56366] E.g.
4629 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4632 Cons(T, Box<Self>) // likewise here
4635 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4636 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4640 - [The default allocator has changed from jemalloc to the default allocator on
4641 your system.][55238] The compiler itself on Linux & macOS will still use
4642 jemalloc, but programs compiled with it will use the system allocator.
4643 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4647 - [`PathBuf` now implements `FromStr`.][55148]
4648 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4649 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4650 easily debug expressions in your rust program. E.g.
4653 let b = dbg!(a * 2) + 1;
4654 // ^-- prints: [src/main.rs:4] a * 2 = 4
4658 The following APIs are now `const` functions and can be used in a
4662 - [`UnsafeCell::get`]
4663 - [`char::is_ascii`]
4665 - [`ManuallyDrop::new`]
4666 - [`ManuallyDrop::into_inner`]
4667 - [`RangeInclusive::start`]
4668 - [`RangeInclusive::end`]
4669 - [`NonNull::as_ptr`]
4672 - [`Duration::as_secs`]
4673 - [`Duration::subsec_millis`]
4674 - [`Duration::subsec_micros`]
4675 - [`Duration::subsec_nanos`]
4677 - [`Ipv4Addr::is_unspecified`]
4679 - [`Ipv6Addr::octets`]
4683 - [`i8::to_be_bytes`]
4684 - [`i8::to_le_bytes`]
4685 - [`i8::to_ne_bytes`]
4686 - [`i8::from_be_bytes`]
4687 - [`i8::from_le_bytes`]
4688 - [`i8::from_ne_bytes`]
4689 - [`i16::to_be_bytes`]
4690 - [`i16::to_le_bytes`]
4691 - [`i16::to_ne_bytes`]
4692 - [`i16::from_be_bytes`]
4693 - [`i16::from_le_bytes`]
4694 - [`i16::from_ne_bytes`]
4695 - [`i32::to_be_bytes`]
4696 - [`i32::to_le_bytes`]
4697 - [`i32::to_ne_bytes`]
4698 - [`i32::from_be_bytes`]
4699 - [`i32::from_le_bytes`]
4700 - [`i32::from_ne_bytes`]
4701 - [`i64::to_be_bytes`]
4702 - [`i64::to_le_bytes`]
4703 - [`i64::to_ne_bytes`]
4704 - [`i64::from_be_bytes`]
4705 - [`i64::from_le_bytes`]
4706 - [`i64::from_ne_bytes`]
4707 - [`i128::to_be_bytes`]
4708 - [`i128::to_le_bytes`]
4709 - [`i128::to_ne_bytes`]
4710 - [`i128::from_be_bytes`]
4711 - [`i128::from_le_bytes`]
4712 - [`i128::from_ne_bytes`]
4713 - [`isize::to_be_bytes`]
4714 - [`isize::to_le_bytes`]
4715 - [`isize::to_ne_bytes`]
4716 - [`isize::from_be_bytes`]
4717 - [`isize::from_le_bytes`]
4718 - [`isize::from_ne_bytes`]
4719 - [`u8::to_be_bytes`]
4720 - [`u8::to_le_bytes`]
4721 - [`u8::to_ne_bytes`]
4722 - [`u8::from_be_bytes`]
4723 - [`u8::from_le_bytes`]
4724 - [`u8::from_ne_bytes`]
4725 - [`u16::to_be_bytes`]
4726 - [`u16::to_le_bytes`]
4727 - [`u16::to_ne_bytes`]
4728 - [`u16::from_be_bytes`]
4729 - [`u16::from_le_bytes`]
4730 - [`u16::from_ne_bytes`]
4731 - [`u32::to_be_bytes`]
4732 - [`u32::to_le_bytes`]
4733 - [`u32::to_ne_bytes`]
4734 - [`u32::from_be_bytes`]
4735 - [`u32::from_le_bytes`]
4736 - [`u32::from_ne_bytes`]
4737 - [`u64::to_be_bytes`]
4738 - [`u64::to_le_bytes`]
4739 - [`u64::to_ne_bytes`]
4740 - [`u64::from_be_bytes`]
4741 - [`u64::from_le_bytes`]
4742 - [`u64::from_ne_bytes`]
4743 - [`u128::to_be_bytes`]
4744 - [`u128::to_le_bytes`]
4745 - [`u128::to_ne_bytes`]
4746 - [`u128::from_be_bytes`]
4747 - [`u128::from_le_bytes`]
4748 - [`u128::from_ne_bytes`]
4749 - [`usize::to_be_bytes`]
4750 - [`usize::to_le_bytes`]
4751 - [`usize::to_ne_bytes`]
4752 - [`usize::from_be_bytes`]
4753 - [`usize::from_le_bytes`]
4754 - [`usize::from_ne_bytes`]
4758 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4759 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4763 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4767 - [The argument types for AVX's
4768 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4769 been changed from `*const` to `*mut` as the previous implementation
4773 [55148]: https://github.com/rust-lang/rust/pull/55148/
4774 [55238]: https://github.com/rust-lang/rust/pull/55238/
4775 [55280]: https://github.com/rust-lang/rust/pull/55280/
4776 [55610]: https://github.com/rust-lang/rust/pull/55610/
4777 [55663]: https://github.com/rust-lang/rust/pull/55663/
4778 [55702]: https://github.com/rust-lang/rust/pull/55702/
4779 [55837]: https://github.com/rust-lang/rust/pull/55837/
4780 [55843]: https://github.com/rust-lang/rust/pull/55843/
4781 [56072]: https://github.com/rust-lang/rust/pull/56072/
4782 [56245]: https://github.com/rust-lang/rust/pull/56245/
4783 [56365]: https://github.com/rust-lang/rust/pull/56365/
4784 [56366]: https://github.com/rust-lang/rust/pull/56366/
4785 [56395]: https://github.com/rust-lang/rust/pull/56395/
4786 [56759]: https://github.com/rust-lang/rust/pull/56759/
4787 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4788 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4789 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4790 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4791 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4792 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4793 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4794 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4795 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4796 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4797 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4798 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4799 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4800 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4801 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4802 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4803 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4804 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4805 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4806 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4807 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4808 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4809 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4810 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4811 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4812 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4813 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4814 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4815 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4816 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4817 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4818 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4819 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4820 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4821 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4822 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4823 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4824 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4825 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4826 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4827 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4828 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4829 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4830 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4831 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4832 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4833 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4834 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4835 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4836 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4837 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4838 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4839 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4840 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4841 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4842 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4843 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4844 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4845 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4846 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4847 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4848 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4849 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4850 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4851 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4852 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4853 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4854 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4855 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4856 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4857 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4858 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4859 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4860 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4861 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4862 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4863 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4864 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4865 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4866 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4867 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4868 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4869 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4870 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4871 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4872 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4873 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4874 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4875 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4876 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4877 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4878 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4879 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4882 Version 1.31.1 (2018-12-20)
4883 ===========================
4885 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4886 - [Fix broken go-to-definition in RLS][rls/1171]
4887 - [Fix infinite loop on hover in RLS][rls/1170]
4889 [56562]: https://github.com/rust-lang/rust/pull/56562
4890 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4891 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4893 Version 1.31.0 (2018-12-06)
4894 ==========================
4898 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4899 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4900 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4901 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4903 - [You can now define and use `const` functions.][54835] These are currently
4904 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4905 [language reference][const-reference] for what exactly is available.
4906 - [You can now use tool lints, which allow you to scope lints from external
4907 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4908 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4909 a crate, not just in exported functions.][54451]
4910 - [You can now use parentheses in pattern matches.][54497]
4914 - [Updated musl to 1.1.20][54430]
4918 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4919 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4920 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4921 into `Option<&mut T>` using the `From` trait.][53218]
4922 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4927 - [`slice::align_to`]
4928 - [`slice::align_to_mut`]
4929 - [`slice::chunks_exact`]
4930 - [`slice::chunks_exact_mut`]
4931 - [`slice::rchunks`]
4932 - [`slice::rchunks_mut`]
4933 - [`slice::rchunks_exact`]
4934 - [`slice::rchunks_exact_mut`]
4935 - [`Option::replace`]
4939 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4940 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4941 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4943 [52813]: https://github.com/rust-lang/rust/pull/52813/
4944 [53218]: https://github.com/rust-lang/rust/pull/53218/
4945 [54057]: https://github.com/rust-lang/rust/pull/54057/
4946 [54240]: https://github.com/rust-lang/rust/pull/54240/
4947 [54430]: https://github.com/rust-lang/rust/pull/54430/
4948 [54451]: https://github.com/rust-lang/rust/pull/54451/
4949 [54497]: https://github.com/rust-lang/rust/pull/54497/
4950 [54778]: https://github.com/rust-lang/rust/pull/54778/
4951 [54835]: https://github.com/rust-lang/rust/pull/54835/
4952 [54870]: https://github.com/rust-lang/rust/pull/54870/
4953 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4954 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4955 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4956 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4957 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4958 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4959 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4960 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4961 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4962 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4963 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4964 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4965 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4966 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4968 Version 1.30.1 (2018-11-08)
4969 ===========================
4971 - [Fixed overflow ICE in rustdoc][54199]
4972 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4974 [54199]: https://github.com/rust-lang/rust/pull/54199
4975 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4977 Version 1.30.0 (2018-10-25)
4978 ==========================
4982 - [Procedural macros are now available.][52081] These kinds of macros allow for
4983 more powerful code generation. There is a [new chapter available][proc-macros]
4984 in the Rust Programming Language book that goes further in depth.
4985 - [You can now use keywords as identifiers using the raw identifiers
4986 syntax (`r#`),][53236] e.g. `let r#for = true;`
4987 - [Using anonymous parameters in traits is now deprecated with a warning and
4988 will be a hard error in the 2018 edition.][53272]
4989 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4990 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4991 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4992 Previously, using a external crate in a module without a use statement
4993 required `let json = ::serde_json::from_str(foo);` but can now be written
4994 as `let json = serde_json::from_str(foo);`.
4995 - [You can now apply the `#[used]` attribute to static items to prevent the
4996 compiler from optimising them away, even if they appear to be unused,][51363]
4997 e.g. `#[used] static FOO: u32 = 1;`
4998 - [You can now import and reexport macros from other crates with the `use`
4999 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5000 the root module of the crate. If your macro relies on calling other local
5001 macros, it is recommended to export with the
5002 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5004 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5005 using the `vis` specifier.][53370]
5006 - [Non-macro attributes now allow all forms of literals, not just
5007 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5008 write `#[attr(true)]`.
5009 - [You can now specify a function to handle a panic in the Rust runtime with the
5010 `#[panic_handler]` attribute.][51366]
5014 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5015 - [Added the `aarch64-unknown-netbsd` target][53165]
5016 - [Upgraded to LLVM 8.][53611]
5020 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5024 - [`Ipv4Addr::BROADCAST`]
5025 - [`Ipv4Addr::LOCALHOST`]
5026 - [`Ipv4Addr::UNSPECIFIED`]
5027 - [`Ipv6Addr::LOCALHOST`]
5028 - [`Ipv6Addr::UNSPECIFIED`]
5029 - [`Iterator::find_map`]
5031 The following methods are replacement methods for `trim_left`, `trim_right`,
5032 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5034 - [`str::trim_end_matches`]
5036 - [`str::trim_start_matches`]
5037 - [`str::trim_start`]
5041 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5042 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5043 equivalent to calling `rustdoc --error-format=json`.
5044 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5048 - [`rustdoc` allows you to specify what edition to treat your code as with the
5049 `--edition` option.][54057]
5050 - [`rustdoc` now has the `--color` (specify whether to output color) and
5051 `--error-format` (specify error format, e.g. `json`) options.][53003]
5052 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5053 debug symbols.][53774]
5054 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5055 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5057 [50911]: https://github.com/rust-lang/rust/pull/50911/
5058 [51363]: https://github.com/rust-lang/rust/pull/51363/
5059 [51366]: https://github.com/rust-lang/rust/pull/51366/
5060 [52081]: https://github.com/rust-lang/rust/pull/52081/
5061 [53003]: https://github.com/rust-lang/rust/pull/53003/
5062 [53033]: https://github.com/rust-lang/rust/pull/53033/
5063 [53044]: https://github.com/rust-lang/rust/pull/53044/
5064 [53165]: https://github.com/rust-lang/rust/pull/53165/
5065 [53611]: https://github.com/rust-lang/rust/pull/53611/
5066 [53236]: https://github.com/rust-lang/rust/pull/53236/
5067 [53272]: https://github.com/rust-lang/rust/pull/53272/
5068 [53370]: https://github.com/rust-lang/rust/pull/53370/
5069 [53459]: https://github.com/rust-lang/rust/pull/53459/
5070 [53774]: https://github.com/rust-lang/rust/pull/53774/
5071 [53822]: https://github.com/rust-lang/rust/pull/53822/
5072 [54057]: https://github.com/rust-lang/rust/pull/54057/
5073 [54404]: https://github.com/rust-lang/rust/pull/54404/
5074 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5075 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5076 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5077 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5079 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5080 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5081 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5082 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5083 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5084 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5085 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5086 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5087 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5088 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5091 Version 1.29.2 (2018-10-11)
5092 ===========================
5094 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5095 - The `rls-preview` component on the windows-gnu targets has been restored.
5097 [54639]: https://github.com/rust-lang/rust/pull/54639
5100 Version 1.29.1 (2018-09-25)
5101 ===========================
5106 - The standard library's `str::repeat` function contained an out of bounds write
5107 caused by an integer overflow. This has been fixed by deterministically
5108 panicking when an overflow happens.
5110 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5114 Version 1.29.0 (2018-09-13)
5115 ==========================
5119 - [Bumped minimum LLVM version to 5.0.][51899]
5120 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5121 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5122 - [Upgraded to LLVM 7.][51966]
5126 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5127 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5128 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5129 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5131 - [`Cell<T>` now allows `T` to be unsized.][50494]
5132 - [`SocketAddr` is now stable on Redox.][52656]
5137 - [`Iterator::flatten`]
5142 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5143 `--locked` to disable this behavior.
5144 - [`cargo-install` will now allow you to cross compile an install
5145 using `--target`.][cargo/5614]
5146 - [Added the `cargo-fix` subcommand to automatically move project code from
5147 2015 edition to 2018.][cargo/5723]
5148 - [`cargo doc` can now optionally document private types using the
5149 `--document-private-items` flag.][cargo/5543]
5153 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5154 the specified level to that level.][52354] For example `--cap-lints warn`
5155 will demote `deny` and `forbid` lints to `warn`.
5156 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5157 fails and `101` if there is a panic.][52197]
5158 - [A preview of clippy has been made available through rustup.][51122]
5159 You can install the preview with `rustup component add clippy-preview`.
5163 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5164 Use `str::get_unchecked(begin..end)` instead.
5165 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5166 Consider using the `home_dir` function from
5167 https://crates.io/crates/dirs instead.
5168 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5169 - [`cfg` attributes and `--cfg` command line flags are now more
5170 strictly validated.][53893]
5172 [53893]: https://github.com/rust-lang/rust/pull/53893/
5173 [52861]: https://github.com/rust-lang/rust/pull/52861/
5174 [51966]: https://github.com/rust-lang/rust/pull/51966/
5175 [52656]: https://github.com/rust-lang/rust/pull/52656/
5176 [52239]: https://github.com/rust-lang/rust/pull/52239/
5177 [52330]: https://github.com/rust-lang/rust/pull/52330/
5178 [52354]: https://github.com/rust-lang/rust/pull/52354/
5179 [52402]: https://github.com/rust-lang/rust/pull/52402/
5180 [52197]: https://github.com/rust-lang/rust/pull/52197/
5181 [51807]: https://github.com/rust-lang/rust/pull/51807/
5182 [51899]: https://github.com/rust-lang/rust/pull/51899/
5183 [51912]: https://github.com/rust-lang/rust/pull/51912/
5184 [51619]: https://github.com/rust-lang/rust/pull/51619/
5185 [51656]: https://github.com/rust-lang/rust/pull/51656/
5186 [51178]: https://github.com/rust-lang/rust/pull/51178/
5187 [51122]: https://github.com/rust-lang/rust/pull/51122
5188 [50494]: https://github.com/rust-lang/rust/pull/50494/
5189 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5190 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5191 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5192 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5193 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5194 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5195 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5198 Version 1.28.0 (2018-08-02)
5199 ===========================
5203 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5204 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5205 the inner type across Foreign Function Interface (FFI) boundaries.
5206 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5207 and can now be used as identifiers.][51196]
5208 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5209 stable.][51241] This will allow users to specify a global allocator for
5211 - [Unit test functions marked with the `#[test]` attribute can now return
5212 `Result<(), E: Debug>` in addition to `()`.][51298]
5213 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5214 allows macros to easily target lifetimes.
5218 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5219 prioritise making smaller binary sizes. `z` is the same as `s` with the
5220 exception that it does not vectorise loops, which typically results in an even
5222 - [The short error format is now stable.][49546] Specified with
5223 `--error-format=short` this option will provide a more compressed output of
5224 rust error messages.
5225 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5226 - [Reduced the number of allocations in the macro parser.][50855] This can
5227 improve compile times of macro heavy crates on average by 5%.
5231 - [Implemented `Default` for `&mut str`.][51306]
5232 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5233 - [Implemented `Extend` for `()`.][50234]
5234 - [The `Debug` implementation of `time::Duration` should now be more easily
5235 human readable.][50364] Previously a `Duration` of one second would printed as
5236 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5237 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5238 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5239 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5240 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5241 for `PathBuf`.][50170]
5242 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5243 and `Wrapping<i128>`.][50465]
5244 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5245 possible.][51050] This can provide up to a 40% speed increase.
5246 - [Improved error messages when using `format!`.][50610]
5250 - [`Iterator::step_by`]
5251 - [`Path::ancestors`]
5252 - [`SystemTime::UNIX_EPOCH`]
5253 - [`alloc::GlobalAlloc`]
5255 - [`alloc::LayoutErr`]
5258 - [`alloc::alloc_zeroed`]
5259 - [`alloc::dealloc`]
5260 - [`alloc::realloc`]
5261 - [`alloc::handle_alloc_error`]
5262 - [`btree_map::Entry::or_default`]
5263 - [`fmt::Alignment`]
5264 - [`hash_map::Entry::or_default`]
5265 - [`iter::repeat_with`]
5266 - [`num::NonZeroUsize`]
5267 - [`num::NonZeroU128`]
5268 - [`num::NonZeroU16`]
5269 - [`num::NonZeroU32`]
5270 - [`num::NonZeroU64`]
5271 - [`num::NonZeroU8`]
5272 - [`ops::RangeBounds`]
5273 - [`slice::SliceIndex`]
5274 - [`slice::from_mut`]
5275 - [`slice::from_ref`]
5276 - [`{Any + Send + Sync}::downcast_mut`]
5277 - [`{Any + Send + Sync}::downcast_ref`]
5278 - [`{Any + Send + Sync}::is`]
5282 - [Cargo will now no longer allow you to publish crates with build scripts that
5283 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5284 considered to be immutable.
5288 - [The `suggestion_applicability` field in `rustc`'s json output is now
5289 stable.][50486] This will allow dev tools to check whether a code suggestion
5290 would apply to them.
5294 - [Rust will consider trait objects with duplicated constraints to be the same
5295 type as without the duplicated constraint.][51276] For example the below code will
5296 now fail to compile.
5301 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5304 impl Trait + Send + Send {
5305 fn test(&self) { println!("two"); }
5309 [49546]: https://github.com/rust-lang/rust/pull/49546/
5310 [50143]: https://github.com/rust-lang/rust/pull/50143/
5311 [50170]: https://github.com/rust-lang/rust/pull/50170/
5312 [50234]: https://github.com/rust-lang/rust/pull/50234/
5313 [50265]: https://github.com/rust-lang/rust/pull/50265/
5314 [50364]: https://github.com/rust-lang/rust/pull/50364/
5315 [50385]: https://github.com/rust-lang/rust/pull/50385/
5316 [50465]: https://github.com/rust-lang/rust/pull/50465/
5317 [50486]: https://github.com/rust-lang/rust/pull/50486/
5318 [50554]: https://github.com/rust-lang/rust/pull/50554/
5319 [50610]: https://github.com/rust-lang/rust/pull/50610/
5320 [50855]: https://github.com/rust-lang/rust/pull/50855/
5321 [51050]: https://github.com/rust-lang/rust/pull/51050/
5322 [51196]: https://github.com/rust-lang/rust/pull/51196/
5323 [51241]: https://github.com/rust-lang/rust/pull/51241/
5324 [51276]: https://github.com/rust-lang/rust/pull/51276/
5325 [51298]: https://github.com/rust-lang/rust/pull/51298/
5326 [51306]: https://github.com/rust-lang/rust/pull/51306/
5327 [51562]: https://github.com/rust-lang/rust/pull/51562/
5328 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5329 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5330 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5331 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5332 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5333 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5334 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5335 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5336 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5337 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5338 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5339 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5340 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5341 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5342 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5343 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5344 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5345 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5346 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5347 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5348 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5349 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5350 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5351 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5352 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5353 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5354 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5355 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5356 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5357 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5359 Version 1.27.2 (2018-07-20)
5360 ===========================
5365 - The borrow checker was fixed to avoid potential unsoundness when using
5366 match ergonomics: [#52213][52213].
5368 [52213]: https://github.com/rust-lang/rust/issues/52213
5370 Version 1.27.1 (2018-07-10)
5371 ===========================
5376 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5377 when running, which enabled executing code as some other user on a
5378 given machine. This release fixes that vulnerability; you can read
5379 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5381 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5386 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5387 match ergonomics: [#51415][51415], [#49534][49534].
5389 [51415]: https://github.com/rust-lang/rust/issues/51415
5390 [49534]: https://github.com/rust-lang/rust/issues/49534
5391 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5392 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5394 Version 1.27.0 (2018-06-21)
5395 ==========================
5399 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5400 be used as an identifier.
5401 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5402 bare `Trait` syntax, and should make it clearer when being used in tandem with
5403 `impl Trait` because it is equivalent to the following syntax:
5404 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5405 `Box<Trait> == Box<dyn Trait>`.
5406 - [Attributes on generic parameters such as types and lifetimes are
5407 now stable.][48851] e.g.
5408 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5409 - [The `#[must_use]` attribute can now also be used on functions as well as
5410 types.][48925] It provides a lint that by default warns users when the
5411 value returned by a function has not been used.
5415 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5419 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5420 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5421 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5422 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5423 the `cfg` attribute.
5424 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5425 std are now available in core.][49896]
5426 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5428 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5429 that the operation isn't done in place.
5430 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5431 the `#[must_use]` attribute][49533] to warn about unused potentially
5432 expensive allocations.
5436 - [`DoubleEndedIterator::rfind`]
5437 - [`DoubleEndedIterator::rfold`]
5438 - [`DoubleEndedIterator::try_rfold`]
5439 - [`Duration::from_micros`]
5440 - [`Duration::from_nanos`]
5441 - [`Duration::subsec_micros`]
5442 - [`Duration::subsec_millis`]
5443 - [`HashMap::remove_entry`]
5444 - [`Iterator::try_fold`]
5445 - [`Iterator::try_for_each`]
5447 - [`Option::filter`]
5448 - [`String::replace_range`]
5449 - [`Take::set_limit`]
5450 - [`hint::unreachable_unchecked`]
5451 - [`os::unix::process::parent_id`]
5452 - [`ptr::swap_nonoverlapping`]
5453 - [`slice::rsplit_mut`]
5455 - [`slice::swap_with_slice`]
5459 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5460 `readme`, and `repository` fields.][cargo/5386]
5461 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5462 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5463 a different directory than `target` for placing compilation artifacts.
5464 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5465 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5466 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5467 where cargo would infer a binary, Cargo will produce a warning. You can
5468 disable this feature ahead of time by setting any of the following to false:
5469 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5470 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5471 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5475 - [Added “The Rustc book” into the official documentation.][49707]
5476 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5477 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5481 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5482 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5483 compile, `"".is_empty()` will still compile.
5484 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5485 will only print the inner type.][48553] E.g.
5486 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5487 not `AtomicBool(true)`.
5488 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5489 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5490 alignment should cover all use cases.
5491 - The `.description()` method on the `std::error::Error` trait
5492 [has been soft-deprecated][50163]. It is no longer required to implement it.
5494 [48553]: https://github.com/rust-lang/rust/pull/48553/
5495 [48851]: https://github.com/rust-lang/rust/pull/48851/
5496 [48925]: https://github.com/rust-lang/rust/pull/48925/
5497 [49533]: https://github.com/rust-lang/rust/pull/49533/
5498 [49623]: https://github.com/rust-lang/rust/pull/49623/
5499 [49630]: https://github.com/rust-lang/rust/pull/49630/
5500 [49664]: https://github.com/rust-lang/rust/pull/49664/
5501 [49699]: https://github.com/rust-lang/rust/pull/49699/
5502 [49707]: https://github.com/rust-lang/rust/pull/49707/
5503 [49896]: https://github.com/rust-lang/rust/pull/49896/
5504 [49968]: https://github.com/rust-lang/rust/pull/49968/
5505 [50163]: https://github.com/rust-lang/rust/pull/50163
5506 [50177]: https://github.com/rust-lang/rust/pull/50177/
5507 [50378]: https://github.com/rust-lang/rust/pull/50378/
5508 [50423]: https://github.com/rust-lang/rust/pull/50423/
5509 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5510 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5511 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5512 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5513 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5514 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5515 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5516 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5517 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5518 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5519 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5520 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5521 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5522 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5523 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5524 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5525 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5526 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5527 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5528 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5529 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5530 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5531 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5532 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5533 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5534 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5535 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5536 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5537 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5540 Version 1.26.2 (2018-06-05)
5541 ==========================
5546 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5548 [51117]: https://github.com/rust-lang/rust/issues/51117
5551 Version 1.26.1 (2018-05-29)
5552 ==========================
5557 - [RLS now works on Windows.][50646]
5558 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5564 - [`fn main() -> impl Trait` no longer works for non-Termination
5566 This reverts an accidental stabilization.
5567 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5568 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5570 [50646]: https://github.com/rust-lang/rust/issues/50646
5571 [50656]: https://github.com/rust-lang/rust/pull/50656
5572 [50812]: https://github.com/rust-lang/rust/pull/50812
5573 [50950]: https://github.com/rust-lang/rust/issues/50950
5574 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5576 Version 1.26.0 (2018-05-10)
5577 ==========================
5581 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5582 implement either or both traits.][49299]
5583 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5584 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5585 lifetime can be elided.][49458]
5586 - [`impl Trait` is now stable allowing you to have abstract types in returns
5587 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5588 `fn open(path: impl AsRef<Path>)`.
5589 - [Pattern matching will now automatically apply dereferences.][49394]
5590 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5591 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5592 - [A lot of operations are now available in a const context.][46882] E.g. You
5593 can now index into constant arrays, reference and dereference into constants,
5594 and use tuple struct constructors.
5595 - [Fixed entry slice patterns are now stable.][48516] E.g.
5597 let points = [1, 2, 3, 4];
5599 [1, 2, 3, 4] => println!("All points were sequential."),
5600 _ => println!("Not all points were sequential."),
5607 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5608 - [Fixed exponential projection complexity on nested types.][48296]
5609 This can provide up to a ~12% reduction in compile times for certain crates.
5610 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5611 to remap path prefixes outputted by the compiler.
5612 - [Added `powerpc-unknown-netbsd` target.][48281]
5616 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5617 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5618 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5619 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5620 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5621 - [`ascii::escape_default` is now available in libcore.][48735]
5622 - [Trailing commas are now supported in std and core macros.][48056]
5623 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5624 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5629 - [`*const T::copy_to_nonoverlapping`]
5630 - [`*const T::copy_to`]
5631 - [`*const T::read_unaligned`]
5632 - [`*const T::read_volatile`]
5633 - [`*const T::read`]
5635 - [`*const T::wrapping_add`]
5636 - [`*const T::wrapping_sub`]
5638 - [`*mut T::copy_to_nonoverlapping`]
5639 - [`*mut T::copy_to`]
5640 - [`*mut T::read_unaligned`]
5641 - [`*mut T::read_volatile`]
5643 - [`*mut T::replace`]
5646 - [`*mut T::wrapping_add`]
5647 - [`*mut T::wrapping_sub`]
5648 - [`*mut T::write_bytes`]
5649 - [`*mut T::write_unaligned`]
5650 - [`*mut T::write_volatile`]
5653 - [`FromUtf8Error::as_bytes`]
5654 - [`LocalKey::try_with`]
5655 - [`Option::cloned`]
5656 - [`btree_map::Entry::and_modify`]
5657 - [`fs::read_to_string`]
5660 - [`hash_map::Entry::and_modify`]
5661 - [`iter::FusedIterator`]
5662 - [`ops::RangeInclusive`]
5663 - [`ops::RangeToInclusive`]
5665 - [`slice::rotate_left`]
5666 - [`slice::rotate_right`]
5667 - [`String::retain`]
5672 - [Cargo will now output path to custom commands when `-v` is
5673 passed with `--list`][cargo/5041]
5674 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5678 - [The second edition of "The Rust Programming Language" book is now recommended
5679 over the first.][48404]
5684 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5685 syntax is now invalid.
5687 use std::ops::Fn as dyn;
5688 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5690 - [The result of dereferences are no longer promoted to `'static`.][47408]
5694 const PAIR: &(i32, i32) = &(0, 1);
5695 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5698 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5699 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5701 - [Removed hoedown from rustdoc.][48274]
5702 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5704 [46882]: https://github.com/rust-lang/rust/pull/46882
5705 [47379]: https://github.com/rust-lang/rust/pull/47379
5706 [47408]: https://github.com/rust-lang/rust/pull/47408
5707 [47813]: https://github.com/rust-lang/rust/pull/47813
5708 [48056]: https://github.com/rust-lang/rust/pull/48056
5709 [48125]: https://github.com/rust-lang/rust/pull/48125
5710 [48235]: https://github.com/rust-lang/rust/pull/48235
5711 [48274]: https://github.com/rust-lang/rust/pull/48274
5712 [48281]: https://github.com/rust-lang/rust/pull/48281
5713 [48296]: https://github.com/rust-lang/rust/pull/48296
5714 [48326]: https://github.com/rust-lang/rust/pull/48326
5715 [48359]: https://github.com/rust-lang/rust/pull/48359
5716 [48404]: https://github.com/rust-lang/rust/pull/48404
5717 [48481]: https://github.com/rust-lang/rust/pull/48481
5718 [48516]: https://github.com/rust-lang/rust/pull/48516
5719 [48628]: https://github.com/rust-lang/rust/pull/48628
5720 [48629]: https://github.com/rust-lang/rust/pull/48629
5721 [48657]: https://github.com/rust-lang/rust/pull/48657
5722 [48735]: https://github.com/rust-lang/rust/pull/48735
5723 [48978]: https://github.com/rust-lang/rust/pull/48978
5724 [49101]: https://github.com/rust-lang/rust/pull/49101
5725 [49109]: https://github.com/rust-lang/rust/pull/49109
5726 [49162]: https://github.com/rust-lang/rust/pull/49162
5727 [49255]: https://github.com/rust-lang/rust/pull/49255
5728 [49299]: https://github.com/rust-lang/rust/pull/49299
5729 [49305]: https://github.com/rust-lang/rust/pull/49305
5730 [49394]: https://github.com/rust-lang/rust/pull/49394
5731 [49458]: https://github.com/rust-lang/rust/pull/49458
5732 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5733 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5734 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5735 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5736 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5737 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5738 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5739 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5740 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5741 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5742 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5743 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5744 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5745 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5746 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5747 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5748 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5749 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5750 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5751 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5752 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5753 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5754 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5755 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5756 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5757 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5758 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5759 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5760 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5761 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5762 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5763 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5764 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5765 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5766 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5767 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5768 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5769 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5770 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5771 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5772 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5773 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5776 Version 1.25.0 (2018-03-29)
5777 ==========================
5781 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5782 - [You can now use nested groups of imports.][47948]
5783 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5784 - [You can now have `|` at the start of a match arm.][47947] e.g.
5786 enum Foo { A, B, C }
5792 | Foo::B => println!("AB"),
5793 | Foo::C => println!("C"),
5800 - [Upgraded to LLVM 6.][47828]
5801 - [Added `-C lto=val` option.][47521]
5802 - [Added `i586-unknown-linux-musl` target][47282]
5806 - [Impl Send for `process::Command` on Unix.][47760]
5807 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5808 - [`UnsafeCell::into_inner` is now safe.][47204]
5809 - [Implement libstd for CloudABI.][47268]
5810 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5811 - [Implement `AsRef<Path>` for Component][46985]
5812 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5813 - [Moved `Duration` to libcore.][46666]
5817 - [`Location::column`]
5820 The following functions can now be used in a constant expression.
5821 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5822 - [`Duration::new`][47300]
5823 - [`Duration::from_secs`][47300]
5824 - [`Duration::from_millis`][47300]
5828 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5829 - [`cargo new` now defaults to creating a binary crate, instead of a
5830 library crate.][cargo/5029]
5834 - [Rust by example is now shipped with new releases][46196]
5838 - [Deprecated `net::lookup_host`.][47510]
5839 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5840 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5841 around indexing operations (see [#47349][47349]). This has been fixed (which also
5842 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5843 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5845 [33903]: https://github.com/rust-lang/rust/pull/33903
5846 [47947]: https://github.com/rust-lang/rust/pull/47947
5847 [47948]: https://github.com/rust-lang/rust/pull/47948
5848 [47760]: https://github.com/rust-lang/rust/pull/47760
5849 [47790]: https://github.com/rust-lang/rust/pull/47790
5850 [47828]: https://github.com/rust-lang/rust/pull/47828
5851 [47398]: https://github.com/rust-lang/rust/pull/47398
5852 [47510]: https://github.com/rust-lang/rust/pull/47510
5853 [47521]: https://github.com/rust-lang/rust/pull/47521
5854 [47204]: https://github.com/rust-lang/rust/pull/47204
5855 [47251]: https://github.com/rust-lang/rust/pull/47251
5856 [47268]: https://github.com/rust-lang/rust/pull/47268
5857 [47282]: https://github.com/rust-lang/rust/pull/47282
5858 [47300]: https://github.com/rust-lang/rust/pull/47300
5859 [47349]: https://github.com/rust-lang/rust/pull/47349
5860 [46931]: https://github.com/rust-lang/rust/pull/46931
5861 [46985]: https://github.com/rust-lang/rust/pull/46985
5862 [47006]: https://github.com/rust-lang/rust/pull/47006
5863 [46830]: https://github.com/rust-lang/rust/pull/46830
5864 [46095]: https://github.com/rust-lang/rust/pull/46095
5865 [46666]: https://github.com/rust-lang/rust/pull/46666
5866 [46196]: https://github.com/rust-lang/rust/pull/46196
5867 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5868 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5869 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5870 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5871 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5874 Version 1.24.1 (2018-03-01)
5875 ==========================
5877 - [Do not abort when unwinding through FFI][48251]
5878 - [Emit UTF-16 files for linker arguments on Windows][48318]
5879 - [Make the error index generator work again][48308]
5880 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5882 [48251]: https://github.com/rust-lang/rust/issues/48251
5883 [48308]: https://github.com/rust-lang/rust/issues/48308
5884 [48318]: https://github.com/rust-lang/rust/issues/48318
5885 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5888 Version 1.24.0 (2018-02-15)
5889 ==========================
5893 - [External `sysv64` ffi is now available.][46528]
5894 eg. `extern "sysv64" fn foo () {}`
5898 - [rustc now uses 16 codegen units by default for release builds.][46910]
5899 For the fastest builds, utilize `codegen-units=1`.
5900 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5901 - [Add `aarch64-unknown-openbsd` support][46760]
5905 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5906 improvement in performance in the majority of cases.
5907 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5908 with Windows.][46798]
5909 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5910 - [impl `From<bool>` for `AtomicBool`][46293]
5911 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5912 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5913 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5914 - [float::from_bits now just uses transmute.][46012] This provides
5915 some optimisations from LLVM.
5916 - [Copied `AsciiExt` methods onto `char`][46077]
5917 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5918 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5919 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5920 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5924 - [`RefCell::replace`]
5926 - [`atomic::spin_loop_hint`]
5928 The following functions can now be used in a constant expression.
5929 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5931 - [`AtomicBool::new`][46287]
5932 - [`AtomicUsize::new`][46287]
5933 - [`AtomicIsize::new`][46287]
5934 - [`AtomicPtr::new`][46287]
5935 - [`Cell::new`][46287]
5936 - [`{integer}::min_value`][46287]
5937 - [`{integer}::max_value`][46287]
5938 - [`mem::size_of`][46287]
5939 - [`mem::align_of`][46287]
5940 - [`ptr::null`][46287]
5941 - [`ptr::null_mut`][46287]
5942 - [`RefCell::new`][46287]
5943 - [`UnsafeCell::new`][46287]
5947 - [Added a `workspace.default-members` config that
5948 overrides implied `--all` in virtual workspaces.][cargo/4743]
5949 - [Enable incremental by default on development builds.][cargo/4817] Also added
5950 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5951 per-project or global basis respectively.
5958 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5959 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5960 in accordance with IETF RFC 4291 §2.2.
5961 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5962 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5963 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5964 - [Leading zeros in tuple struct members is now an error][47084]
5965 - [`column!()` macro is one-based instead of zero-based][46977]
5966 - [`fmt::Arguments` can no longer be shared across threads][45198]
5967 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5968 - [Cargo sets a different working directory for the compiler][cargo/4788]
5970 [44884]: https://github.com/rust-lang/rust/pull/44884
5971 [45198]: https://github.com/rust-lang/rust/pull/45198
5972 [45506]: https://github.com/rust-lang/rust/pull/45506
5973 [45990]: https://github.com/rust-lang/rust/pull/45990
5974 [46012]: https://github.com/rust-lang/rust/pull/46012
5975 [46077]: https://github.com/rust-lang/rust/pull/46077
5976 [46094]: https://github.com/rust-lang/rust/pull/46094
5977 [46284]: https://github.com/rust-lang/rust/pull/46284
5978 [46287]: https://github.com/rust-lang/rust/pull/46287
5979 [46293]: https://github.com/rust-lang/rust/pull/46293
5980 [46528]: https://github.com/rust-lang/rust/pull/46528
5981 [46671]: https://github.com/rust-lang/rust/pull/46671
5982 [46713]: https://github.com/rust-lang/rust/pull/46713
5983 [46735]: https://github.com/rust-lang/rust/pull/46735
5984 [46760]: https://github.com/rust-lang/rust/pull/46760
5985 [46798]: https://github.com/rust-lang/rust/pull/46798
5986 [46828]: https://github.com/rust-lang/rust/pull/46828
5987 [46831]: https://github.com/rust-lang/rust/pull/46831
5988 [46833]: https://github.com/rust-lang/rust/pull/46833
5989 [46910]: https://github.com/rust-lang/rust/pull/46910
5990 [46977]: https://github.com/rust-lang/rust/pull/46977
5991 [47018]: https://github.com/rust-lang/rust/pull/47018
5992 [47080]: https://github.com/rust-lang/rust/pull/47080
5993 [47084]: https://github.com/rust-lang/rust/pull/47084
5994 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5995 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5996 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5997 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5998 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5999 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6002 Version 1.23.0 (2018-01-04)
6003 ==========================
6007 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6008 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6009 Which should fix some confusing errors in some operations.
6013 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6014 undefined behavior.][45920]
6015 - [rustc now suggests renaming import if names clash.][45660]
6016 - [Display errors/warnings correctly when there are zero-width or
6017 wide characters.][45711]
6018 - [rustc now avoids unnecessary copies of arguments that are
6019 simple bindings][45380] This should improve memory usage on average by 5-10%.
6020 - [Updated musl used to build musl rustc to 1.1.17][45393]
6024 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6025 - [Implement Hash for raw pointers to unsized types][45483]
6026 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6027 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6028 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6029 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6030 and `<*mut T>::as_mut`][44932]
6031 - [Optimized `Thread::{park, unpark}` implementation][45524]
6032 - [Improved `SliceExt::binary_search` performance.][45333]
6033 - [impl `FromIterator<()>` for `()`][45379]
6034 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6042 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6043 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6044 - [Added unit test checking to `cargo check`][cargo/4592]
6045 - [Cargo now lets you install a specific version
6046 using `cargo install --version`][cargo/4637]
6050 - [Releases now ship with the Cargo book documentation.][45692]
6051 - [rustdoc now prints rendering warnings on every run.][45324]
6055 - [Changes have been made to type equality to make it more correct,
6056 in rare cases this could break some code.][45853] [Tracking issue for
6057 further information][45852]
6058 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6059 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6060 Android 9, the minimum supported version is Android 14.
6061 - [Bumped the minimum LLVM to 3.9][45326]
6063 [44042]: https://github.com/rust-lang/rust/pull/44042
6064 [44932]: https://github.com/rust-lang/rust/pull/44932
6065 [45267]: https://github.com/rust-lang/rust/pull/45267
6066 [45324]: https://github.com/rust-lang/rust/pull/45324
6067 [45326]: https://github.com/rust-lang/rust/pull/45326
6068 [45333]: https://github.com/rust-lang/rust/pull/45333
6069 [45379]: https://github.com/rust-lang/rust/pull/45379
6070 [45380]: https://github.com/rust-lang/rust/pull/45380
6071 [45393]: https://github.com/rust-lang/rust/pull/45393
6072 [45435]: https://github.com/rust-lang/rust/pull/45435
6073 [45483]: https://github.com/rust-lang/rust/pull/45483
6074 [45524]: https://github.com/rust-lang/rust/pull/45524
6075 [45571]: https://github.com/rust-lang/rust/pull/45571
6076 [45580]: https://github.com/rust-lang/rust/pull/45580
6077 [45610]: https://github.com/rust-lang/rust/pull/45610
6078 [45660]: https://github.com/rust-lang/rust/pull/45660
6079 [45692]: https://github.com/rust-lang/rust/pull/45692
6080 [45711]: https://github.com/rust-lang/rust/pull/45711
6081 [45772]: https://github.com/rust-lang/rust/pull/45772
6082 [45852]: https://github.com/rust-lang/rust/issues/45852
6083 [45853]: https://github.com/rust-lang/rust/pull/45853
6084 [45887]: https://github.com/rust-lang/rust/pull/45887
6085 [45920]: https://github.com/rust-lang/rust/pull/45920
6086 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6087 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6088 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6091 Version 1.22.1 (2017-11-22)
6092 ==========================
6094 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6096 [46183]: https://github.com/rust-lang/rust/pull/46183
6098 Version 1.22.0 (2017-11-22)
6099 ==========================
6103 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6104 - [Now accepts underscores in unicode escapes][43716]
6105 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6106 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6110 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6111 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6112 This should decrease compile times for debug builds.
6113 - [strict memory alignment now enabled on ARMv6][45094]
6114 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6118 - [Allow atomic operations up to 32 bits
6119 on `armv5te_unknown_linux_gnueabi`][44978]
6120 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6121 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6122 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6123 - [Properly detect overflow in `Instant += Duration`.][44220]
6124 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6125 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6126 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6133 - [Cargo will now build multi file examples in subdirectories of the `examples`
6134 folder that have a `main.rs` file.][cargo/4496]
6135 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6136 the old format will continue to work and can be updated with `cargo update`.
6137 - [Now supports vendoring git repositories][cargo/3992]
6141 - [`libbacktrace` is now available on Apple platforms.][44251]
6142 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6143 This now lets you specify that a given code example will fail to compile.
6147 - [The minimum Android version that rustc can build for has been bumped
6148 to `4.0` from `2.3`][45656]
6149 - [Allowing `T op= &T` for numeric types has broken some type
6150 inference cases][45480]
6153 [42526]: https://github.com/rust-lang/rust/pull/42526
6154 [43716]: https://github.com/rust-lang/rust/pull/43716
6155 [43949]: https://github.com/rust-lang/rust/pull/43949
6156 [44015]: https://github.com/rust-lang/rust/pull/44015
6157 [44220]: https://github.com/rust-lang/rust/pull/44220
6158 [44251]: https://github.com/rust-lang/rust/pull/44251
6159 [44287]: https://github.com/rust-lang/rust/pull/44287
6160 [44303]: https://github.com/rust-lang/rust/pull/44303
6161 [44456]: https://github.com/rust-lang/rust/pull/44456
6162 [44466]: https://github.com/rust-lang/rust/pull/44466
6163 [44895]: https://github.com/rust-lang/rust/pull/44895
6164 [44966]: https://github.com/rust-lang/rust/pull/44966
6165 [44978]: https://github.com/rust-lang/rust/pull/44978
6166 [45041]: https://github.com/rust-lang/rust/pull/45041
6167 [45064]: https://github.com/rust-lang/rust/pull/45064
6168 [45075]: https://github.com/rust-lang/rust/pull/45075
6169 [45094]: https://github.com/rust-lang/rust/pull/45094
6170 [45095]: https://github.com/rust-lang/rust/pull/45095
6171 [45480]: https://github.com/rust-lang/rust/issues/45480
6172 [45656]: https://github.com/rust-lang/rust/pull/45656
6173 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6174 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6175 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6182 Version 1.21.0 (2017-10-12)
6183 ==========================
6187 - [You can now use static references for literals.][43838]
6191 let x: &'static u32 = &0;
6194 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6197 my_macro!(Vec<i32>::new); // Always worked
6198 my_macro!(Vec::<i32>::new); // Now works
6203 - [Upgraded jemalloc to 4.5.0][43911]
6204 - [Enabled unwinding panics on Redox][43917]
6205 - [Now runs LLVM in parallel during translation phase.][43506]
6206 This should reduce peak memory usage.
6210 - [Generate builtin impls for `Clone` for all arrays and tuples that
6211 are `T: Clone`][43690]
6212 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6213 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6214 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6219 [`std::mem::discriminant`]
6223 - [You can now call `cargo install` with multiple package names][cargo/4216]
6224 - [Cargo commands inside a virtual workspace will now implicitly
6225 pass `--all`][cargo/4335]
6226 - [Added a `[patch]` section to `Cargo.toml` to handle
6227 prepublication dependencies][cargo/4123] [RFC 1969]
6228 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6229 like patterns][cargo/4270]
6230 - [Added the `--all-targets` option][cargo/4400]
6231 - [Using required dependencies as a feature is now deprecated and emits
6232 a warning][cargo/4364]
6237 - [Cargo docs are moving][43916]
6238 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6239 - [The rustdoc book is now available][43863]
6240 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6241 - [Added a preview of RLS has been made available through rustup][44204]
6242 Install with `rustup component add rls-preview`
6243 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6244 Previously only showed `std::os::unix`.
6248 - [Changes in method matching against higher-ranked types][43880] This may cause
6249 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6250 - [rustc's JSON error output's byte position start at top of file.][42973]
6251 Was previously relative to the rustc's internal `CodeMap` struct which
6252 required the unstable library `libsyntax` to correctly use.
6253 - [`unused_results` lint no longer ignores booleans][43728]
6255 [42565]: https://github.com/rust-lang/rust/pull/42565
6256 [42973]: https://github.com/rust-lang/rust/pull/42973
6257 [43348]: https://github.com/rust-lang/rust/pull/43348
6258 [43459]: https://github.com/rust-lang/rust/pull/43459
6259 [43506]: https://github.com/rust-lang/rust/pull/43506
6260 [43540]: https://github.com/rust-lang/rust/pull/43540
6261 [43690]: https://github.com/rust-lang/rust/pull/43690
6262 [43728]: https://github.com/rust-lang/rust/pull/43728
6263 [43838]: https://github.com/rust-lang/rust/pull/43838
6264 [43863]: https://github.com/rust-lang/rust/pull/43863
6265 [43880]: https://github.com/rust-lang/rust/pull/43880
6266 [43911]: https://github.com/rust-lang/rust/pull/43911
6267 [43916]: https://github.com/rust-lang/rust/pull/43916
6268 [43917]: https://github.com/rust-lang/rust/pull/43917
6269 [44204]: https://github.com/rust-lang/rust/pull/44204
6270 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6271 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6272 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6273 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6274 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6275 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6276 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6277 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6278 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6280 Version 1.20.0 (2017-08-31)
6281 ===========================
6285 - [Associated constants are now stabilised.][42809]
6286 - [A lot of macro bugs are now fixed.][42913]
6291 - [Struct fields are now properly coerced to the expected field type.][42807]
6292 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6293 `wasm32-experimental-emscripten` target.
6294 - [Changed some of the error messages to be more helpful.][42033]
6295 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6297 - [rustc now reports the total number of errors on compilation failure][43015]
6298 previously this was only the number of errors in the pass that failed.
6299 - [Expansion in rustc has been sped up 29x.][42533]
6300 - [added `msp430-none-elf` target.][43099]
6301 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6303 - [Fixes backtraces on Redox][43228]
6304 - [rustc now identifies different versions of same crate when absolute paths of
6305 different types match in an error message.][42826]
6311 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6312 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6314 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6315 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6316 - [Impl `Clone` for `DefaultHasher`.][42799]
6317 - [Impl `Sync` for `SyncSender`.][42397]
6318 - [Impl `FromStr` for `char`][42271]
6319 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6321 - [allow messages in the `unimplemented!()` macro.][42155]
6322 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6323 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6324 - [Upgrade to Unicode 10.0.0][42999]
6325 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6326 - [Skip the main thread's manual stack guard on Linux][43072]
6327 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6328 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6330 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6335 - [`CStr::into_c_string`]
6336 - [`CString::as_c_str`]
6337 - [`CString::into_boxed_c_str`]
6338 - [`Chain::get_mut`]
6339 - [`Chain::get_ref`]
6340 - [`Chain::into_inner`]
6341 - [`Option::get_or_insert_with`]
6342 - [`Option::get_or_insert`]
6343 - [`OsStr::into_os_string`]
6344 - [`OsString::into_boxed_os_str`]
6347 - [`Utf8Error::error_len`]
6348 - [`char::EscapeDebug`]
6349 - [`char::escape_debug`]
6350 - [`compile_error!`]
6351 - [`f32::from_bits`]
6353 - [`f64::from_bits`]
6355 - [`mem::ManuallyDrop`]
6356 - [`slice::sort_unstable_by_key`]
6357 - [`slice::sort_unstable_by`]
6358 - [`slice::sort_unstable`]
6359 - [`str::from_boxed_utf8_unchecked`]
6360 - [`str::as_bytes_mut`]
6361 - [`str::as_bytes_mut`]
6362 - [`str::from_utf8_mut`]
6363 - [`str::from_utf8_unchecked_mut`]
6365 - [`str::get_unchecked_mut`]
6366 - [`str::get_unchecked`]
6368 - [`str::into_boxed_bytes`]
6373 - [Cargo API token location moved from `~/.cargo/config` to
6374 `~/.cargo/credentials`.][cargo/3978]
6375 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6376 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6377 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6378 - [You can now specify version of a binary when installed through
6379 `cargo install` using `--vers`.][cargo/4229]
6380 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6381 failure.][cargo/4248]
6382 - [Changed the convention around which file is the crate root.][cargo/4259]
6387 - [Functions with `'static` in their return types will now not be as usable as
6388 if they were using lifetime parameters instead.][42417]
6389 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6390 takes the sign of NaN into account where previously didn't.][42430]
6392 [42033]: https://github.com/rust-lang/rust/pull/42033
6393 [42155]: https://github.com/rust-lang/rust/pull/42155
6394 [42271]: https://github.com/rust-lang/rust/pull/42271
6395 [42397]: https://github.com/rust-lang/rust/pull/42397
6396 [42417]: https://github.com/rust-lang/rust/pull/42417
6397 [42430]: https://github.com/rust-lang/rust/pull/42430
6398 [42431]: https://github.com/rust-lang/rust/pull/42431
6399 [42533]: https://github.com/rust-lang/rust/pull/42533
6400 [42571]: https://github.com/rust-lang/rust/pull/42571
6401 [42613]: https://github.com/rust-lang/rust/pull/42613
6402 [42799]: https://github.com/rust-lang/rust/pull/42799
6403 [42807]: https://github.com/rust-lang/rust/pull/42807
6404 [42809]: https://github.com/rust-lang/rust/pull/42809
6405 [42822]: https://github.com/rust-lang/rust/pull/42822
6406 [42826]: https://github.com/rust-lang/rust/pull/42826
6407 [42854]: https://github.com/rust-lang/rust/pull/42854
6408 [42913]: https://github.com/rust-lang/rust/pull/42913
6409 [42999]: https://github.com/rust-lang/rust/pull/42999
6410 [43011]: https://github.com/rust-lang/rust/pull/43011
6411 [43015]: https://github.com/rust-lang/rust/pull/43015
6412 [43072]: https://github.com/rust-lang/rust/pull/43072
6413 [43077]: https://github.com/rust-lang/rust/pull/43077
6414 [43097]: https://github.com/rust-lang/rust/pull/43097
6415 [43099]: https://github.com/rust-lang/rust/pull/43099
6416 [43170]: https://github.com/rust-lang/rust/pull/43170
6417 [43178]: https://github.com/rust-lang/rust/pull/43178
6418 [43185]: https://github.com/rust-lang/rust/pull/43185
6419 [43228]: https://github.com/rust-lang/rust/pull/43228
6420 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6421 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6422 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6423 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6424 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6425 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6426 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6427 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6428 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6429 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6430 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6431 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6432 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6433 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6434 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6435 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6436 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6437 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6438 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6439 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6440 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6441 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6442 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6443 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6444 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6445 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6446 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6447 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6448 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6449 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6450 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6451 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6452 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6453 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6454 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6455 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6456 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6457 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6460 Version 1.19.0 (2017-07-20)
6461 ===========================
6466 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6467 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6468 - [Macro recursion limit increased to 1024 from 64.][41676]
6469 - [Added lint for detecting unused macros.][41907]
6470 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6471 For example: `let x = loop { break 7; };`
6472 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6473 contain `Copy` types and cannot have a `Drop` implementation.
6474 Example: `union Foo { bar: u8, baz: usize }`
6475 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6476 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6481 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6482 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6483 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6484 you should use `--target armv7-linux-androideabi`.
6485 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6486 - [Minor optimisation of string operations.][42037]
6487 - [Compiler error message is now `aborting due to previous error(s)` instead of
6488 `aborting due to N previous errors`][42150] This was previously inaccurate and
6489 would only count certain kinds of errors.
6490 - [The compiler now supports Visual Studio 2017][42225]
6491 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6492 - [Added a lot][42264] of [new error codes][42302]
6493 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6494 libraries with C Run-time Libraries(CRT) to be statically linked.
6495 - [Fixed various ARM codegen bugs][42740]
6500 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6501 `Extend<Cow<'a, str>>`][41449]
6502 - [`Vec` now implements `From<&mut [T]>`][41530]
6503 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6504 - [`SplitWhitespace` now implements `Clone`][41659]
6505 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6507 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6508 macros, but for printing to stderr.
6513 - [`OsString::shrink_to_fit`]
6516 - [`thread::ThreadId`]
6521 - [Build scripts can now add environment variables to the environment
6522 the crate is being compiled in.
6523 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6524 - [Subcommands now replace the current process rather than spawning a new
6525 child process][cargo/3970]
6526 - [Workspace members can now accept glob file patterns][cargo/3979]
6527 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6528 the members in a given workspace.][cargo/3988]
6529 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6530 - [Target directory path is now in the cargo metadata][cargo/4022]
6531 - [Cargo no longer checks out a local working directory for the
6532 crates.io index][cargo/4026] This should provide smaller file size for the
6533 registry, and improve cloning times, especially on Windows machines.
6534 - [Added an `--exclude` option for excluding certain packages when using the
6535 `--all` option][cargo/4031]
6536 - [Cargo will now automatically retry when receiving a 5xx error
6537 from crates.io][cargo/4032]
6538 - [The `--features` option now accepts multiple comma or space
6539 delimited values.][cargo/4084]
6540 - [Added support for custom target specific runners][cargo/3954]
6545 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6547 - [Rust will now release XZ compressed packages][rust-installer/57]
6548 - [rustup will now prefer to download rust packages with
6549 XZ compression][rustup/1100] over GZip packages.
6550 - [Added the ability to escape `#` in rust documentation][41785] By adding
6551 additional `#`'s ie. `##` is now `#`
6556 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6557 - [`-Z` flags are now no longer allowed to be used on the stable
6558 compiler.][41751] This has been a warning for a year previous to this.
6559 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6560 longer works][42844]. Users should migrate to the built-in `check`
6561 command, which has been available since 1.16.
6562 - [Ending a float literal with `._` is now a hard error.
6563 Example: `42._` .][41946]
6564 - [Any use of a private `extern crate` outside of its module is now a
6565 hard error.][36886] This was previously a warning.
6566 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6567 relative while the `::` prefix makes a path absolute, but was ignored and the
6568 path was relative regardless.
6569 - [Floating point constants in match patterns is now a hard error][36890]
6570 This was previously a warning.
6571 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6572 match patterns is now a hard error][36891] This was previously a warning.
6573 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6575 - [From the pound escape, lines consisting of multiple `#`s are
6577 - [It is an error to re-export private enum variants][42460]. This is
6578 known to break a number of crates that depend on an older version of
6580 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6581 to use it to find the linker, and the build will fail where it did
6582 not previously][42607]
6584 [36886]: https://github.com/rust-lang/rust/issues/36886
6585 [36888]: https://github.com/rust-lang/rust/issues/36888
6586 [36890]: https://github.com/rust-lang/rust/issues/36890
6587 [36891]: https://github.com/rust-lang/rust/issues/36891
6588 [36892]: https://github.com/rust-lang/rust/issues/36892
6589 [37406]: https://github.com/rust-lang/rust/issues/37406
6590 [39983]: https://github.com/rust-lang/rust/pull/39983
6591 [41145]: https://github.com/rust-lang/rust/pull/41145
6592 [41192]: https://github.com/rust-lang/rust/pull/41192
6593 [41258]: https://github.com/rust-lang/rust/pull/41258
6594 [41370]: https://github.com/rust-lang/rust/pull/41370
6595 [41449]: https://github.com/rust-lang/rust/pull/41449
6596 [41530]: https://github.com/rust-lang/rust/pull/41530
6597 [41624]: https://github.com/rust-lang/rust/pull/41624
6598 [41656]: https://github.com/rust-lang/rust/pull/41656
6599 [41659]: https://github.com/rust-lang/rust/pull/41659
6600 [41676]: https://github.com/rust-lang/rust/pull/41676
6601 [41751]: https://github.com/rust-lang/rust/pull/41751
6602 [41764]: https://github.com/rust-lang/rust/pull/41764
6603 [41785]: https://github.com/rust-lang/rust/pull/41785
6604 [41873]: https://github.com/rust-lang/rust/pull/41873
6605 [41907]: https://github.com/rust-lang/rust/pull/41907
6606 [41946]: https://github.com/rust-lang/rust/pull/41946
6607 [42016]: https://github.com/rust-lang/rust/pull/42016
6608 [42037]: https://github.com/rust-lang/rust/pull/42037
6609 [42068]: https://github.com/rust-lang/rust/pull/42068
6610 [42150]: https://github.com/rust-lang/rust/pull/42150
6611 [42162]: https://github.com/rust-lang/rust/pull/42162
6612 [42225]: https://github.com/rust-lang/rust/pull/42225
6613 [42264]: https://github.com/rust-lang/rust/pull/42264
6614 [42302]: https://github.com/rust-lang/rust/pull/42302
6615 [42460]: https://github.com/rust-lang/rust/issues/42460
6616 [42607]: https://github.com/rust-lang/rust/issues/42607
6617 [42740]: https://github.com/rust-lang/rust/pull/42740
6618 [42844]: https://github.com/rust-lang/rust/issues/42844
6619 [42948]: https://github.com/rust-lang/rust/pull/42948
6620 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6621 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6622 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6623 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6624 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6625 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6626 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6627 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6628 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6629 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6630 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6631 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6632 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6633 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6634 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6635 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6636 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6637 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6638 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6639 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6640 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6641 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6644 Version 1.18.0 (2017-06-08)
6645 ===========================
6650 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6651 make the item visible to just that module tree. Also accepts the keyword
6652 `crate` to make something public to the whole crate but not users of the
6653 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6654 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6655 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6656 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6657 types like `Write + Send`, trailing `+` are now supported in trait objects,
6658 and better error reporting for trait objects starting with `?Sized`.
6659 - [0e+10 is now a valid floating point literal][40589]
6660 - [Now warns if you bind a lifetime parameter to 'static][40734]
6661 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6662 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6663 representation in some cases.][40377]
6668 - [rustc can now emit mir with `--emit mir`][39891]
6669 - [Improved LLVM IR for trivial functions][40367]
6670 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6671 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6672 opportunities found through profiling
6673 - [Improved backtrace formatting when panicking][38165]
6678 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6679 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6680 iteration or reallocation.
6681 - [Simplified HashMap Bucket interface][40561] provides performance
6682 improvements for iterating and cloning.
6683 - [Specialize Vec::from_elem to use calloc][40409]
6684 - [Fixed Race condition in fs::create_dir_all][39799]
6685 - [No longer caching stdio on Windows][40516]
6686 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6687 2.50%~ faster and in one case now 12.50% faster.
6688 - [Optimized `AtomicBool::fetch_nand`][41143]
6693 - [`Child::try_wait`]
6694 - [`HashMap::retain`]
6695 - [`HashSet::retain`]
6697 - [`TcpStream::peek`]
6698 - [`UdpSocket::peek`]
6699 - [`UdpSocket::peek_from`]
6704 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6705 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6706 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6707 - [Added Android build support][cargo/3885]
6708 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6709 of a certain type, for example `cargo build --bins` will build all
6711 - [Added support for haiku][cargo/3952]
6716 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6717 - [Rust now uses the official cross compiler for NetBSD][40612]
6718 - [rustdoc now accepts `#` at the start of files][40828]
6719 - [Fixed jemalloc support for musl][41168]
6724 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6725 always placed after the sign if it exists and before the digits. With the `#`
6726 flag the zeroes are placed after the prefix and before the digits.
6727 - [Due to the struct field optimisation][40377], using `transmute` on structs
6728 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6729 always been undefined behavior, but is now more likely to break in practice.
6730 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6731 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6732 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6733 - [Overlapping inherent `impl`s are now a hard error][40728]
6734 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6735 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6736 `out.asm` and `out.ll` instead of only one of the filetypes.
6737 - [ calling a function that returns `Self` will no longer work][41805] when
6738 the size of `Self` cannot be statically determined.
6739 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6740 this has caused a few regressions namely:
6742 - Changed the link order of local static/dynamic libraries (respecting the
6743 order on given rather than having the compiler reorder).
6744 - Changed how MinGW is linked, native code linked to dynamic libraries
6745 may require manually linking to the gcc support library (for the native
6748 [38165]: https://github.com/rust-lang/rust/pull/38165
6749 [39799]: https://github.com/rust-lang/rust/pull/39799
6750 [39891]: https://github.com/rust-lang/rust/pull/39891
6751 [40043]: https://github.com/rust-lang/rust/pull/40043
6752 [40241]: https://github.com/rust-lang/rust/pull/40241
6753 [40338]: https://github.com/rust-lang/rust/pull/40338
6754 [40367]: https://github.com/rust-lang/rust/pull/40367
6755 [40377]: https://github.com/rust-lang/rust/pull/40377
6756 [40409]: https://github.com/rust-lang/rust/pull/40409
6757 [40516]: https://github.com/rust-lang/rust/pull/40516
6758 [40556]: https://github.com/rust-lang/rust/pull/40556
6759 [40561]: https://github.com/rust-lang/rust/pull/40561
6760 [40589]: https://github.com/rust-lang/rust/pull/40589
6761 [40612]: https://github.com/rust-lang/rust/pull/40612
6762 [40723]: https://github.com/rust-lang/rust/pull/40723
6763 [40728]: https://github.com/rust-lang/rust/pull/40728
6764 [40731]: https://github.com/rust-lang/rust/pull/40731
6765 [40734]: https://github.com/rust-lang/rust/pull/40734
6766 [40805]: https://github.com/rust-lang/rust/pull/40805
6767 [40807]: https://github.com/rust-lang/rust/pull/40807
6768 [40828]: https://github.com/rust-lang/rust/pull/40828
6769 [40870]: https://github.com/rust-lang/rust/pull/40870
6770 [41085]: https://github.com/rust-lang/rust/pull/41085
6771 [41143]: https://github.com/rust-lang/rust/pull/41143
6772 [41168]: https://github.com/rust-lang/rust/pull/41168
6773 [41270]: https://github.com/rust-lang/rust/issues/41270
6774 [41469]: https://github.com/rust-lang/rust/pull/41469
6775 [41805]: https://github.com/rust-lang/rust/issues/41805
6776 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6777 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6778 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6779 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6780 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6781 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6782 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6783 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6784 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6785 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6786 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6787 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6788 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6789 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6792 Version 1.17.0 (2017-04-27)
6793 ===========================
6798 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6799 * [Fields of structs may be initialized without duplicating the field/variable
6800 names][39761]. [RFC 1682]
6801 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6802 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6803 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6804 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6805 `'b`. Soundness fix.
6806 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6807 * [Static variables may contain references to other statics][40027]
6812 * [Exit quickly on only `--emit dep-info`][40336]
6813 * [Make `-C relocation-model` more correctly determine whether the linker
6814 creates a position-independent executable][40245]
6815 * [Add `-C overflow-checks` to directly control whether integer overflow
6817 * [The rustc type checker now checks items on demand instead of in a single
6818 in-order pass][40008]. This is mostly an internal refactoring in support of
6819 future work, including incremental type checking, but also resolves [RFC
6820 1647], allowing `Self` to appear in `impl` `where` clauses.
6821 * [Optimize vtable loads][39995]
6822 * [Turn off vectorization for Emscripten targets][39990]
6823 * [Provide suggestions for unknown macros imported with `use`][39953]
6824 * [Fix ICEs in path resolution][39939]
6825 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6826 * [Add clearer error message using `&str + &str`][39116]
6837 * [`Ordering::then`]
6838 * [`Ordering::then_with`]
6839 * [`BTreeMap::range`]
6840 * [`BTreeMap::range_mut`]
6841 * [`collections::Bound`]
6842 * [`process::abort`]
6843 * [`ptr::read_unaligned`]
6844 * [`ptr::write_unaligned`]
6845 * [`Result::expect_err`]
6848 * [`Cell::into_inner`]
6854 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6855 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6856 * [`String` implements `FromIterator<&char>`][40028]
6857 * `Box` [implements][40009] a number of new conversions:
6858 `From<Box<str>> for String`,
6859 `From<Box<[T]>> for Vec<T>`,
6860 `From<Box<CStr>> for CString`,
6861 `From<Box<OsStr>> for OsString`,
6862 `From<Box<Path>> for PathBuf`,
6863 `Into<Box<str>> for String`,
6864 `Into<Box<[T]>> for Vec<T>`,
6865 `Into<Box<CStr>> for CString`,
6866 `Into<Box<OsStr>> for OsString`,
6867 `Into<Box<Path>> for PathBuf`,
6868 `Default for Box<str>`,
6869 `Default for Box<CStr>`,
6870 `Default for Box<OsStr>`,
6871 `From<&CStr> for Box<CStr>`,
6872 `From<&OsStr> for Box<OsStr>`,
6873 `From<&Path> for Box<Path>`
6874 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6875 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6876 * [Slightly optimize `slice::sort`][39538]
6877 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6878 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6879 `Box<str>` implements `From<&str>`][39438]
6880 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6881 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6882 * [`format!` estimates the needed capacity before writing a string][39356]
6883 * [Support unprivileged symlink creation in Windows][38921]
6884 * [`PathBuf` implements `Default`][38764]
6885 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6886 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6887 and poor hash functions.
6892 * [Add `cargo check --all`][cargo/3731]
6893 * [Add an option to ignore SSL revocation checking][cargo/3699]
6894 * [Add `cargo run --package`][cargo/3691]
6895 * [Add `required_features`][cargo/3667]
6896 * [Assume `build.rs` is a build script][cargo/3664]
6897 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6902 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6904 * [The "Unstable Book" documents nightly-only features][ubook]
6905 * [Improve the style of the sidebar in rustdoc output][40265]
6906 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6907 * [Fix MSP430 breakage due to `i128`][40257]
6908 * [Preliminary Solaris/SPARCv9 support][39903]
6909 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6910 run without installing the MSVC runtime.
6911 * [`rustdoc --test` includes file names in test names][39788]
6912 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6913 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6914 * [Initial support for `aarch64-unknown-freebsd`][39491]
6915 * [Initial support for `i686-unknown-netbsd`][39426]
6916 * [This release no longer includes the old makefile build system][39431]. Rust
6917 is built with a custom build system, written in Rust, and with Cargo.
6918 * [Add Debug implementations for libcollection structs][39002]
6919 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6920 * [`--test-threads=0` produces an error][38945]
6921 * [`rustup` installs documentation by default][40526]
6922 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6923 WinDbg and Visual Studio to improve the debugging experience.
6928 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6929 workaround, either use MSVC 2015 or run vcvars.bat.
6930 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6931 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6932 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6934 * [`format!` and `Display::to_string` panic if an underlying formatting
6935 implementation returns an error][40117]. Previously the error was silently
6936 ignored. It is incorrect for `write_fmt` to return an error when writing
6938 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6939 crates were marked stable and could be accessed from the stable toolchain.
6940 * [Rust git source no longer includes vendored crates][39728]. Those that need
6941 to build with vendored crates should build from release tarballs.
6942 * [Fix inert attributes from `proc_macro_derives`][39572]
6943 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6944 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6946 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6947 existing code generally ignores the type of dead-code unless a type-hint is
6948 provided; this can cause surprising inference interactions particularly around
6949 defaulting. The new code uniformly ignores the result type of dead-code.
6950 * [Tuple-struct constructors with private fields are no longer visible][38932]
6951 * [Lifetime parameters that do not appear in the arguments are now considered
6952 early-bound][38897], resolving a soundness bug (#[32330]). The
6953 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6955 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6956 * [Make transmuting from fn item types to pointer-sized types a hard
6959 [27787]: https://github.com/rust-lang/rust/issues/27787
6960 [32330]: https://github.com/rust-lang/rust/issues/32330
6961 [34198]: https://github.com/rust-lang/rust/pull/34198
6962 [38161]: https://github.com/rust-lang/rust/pull/38161
6963 [38368]: https://github.com/rust-lang/rust/pull/38368
6964 [38584]: https://github.com/rust-lang/rust/issues/38584
6965 [38661]: https://github.com/rust-lang/rust/pull/38661
6966 [38764]: https://github.com/rust-lang/rust/pull/38764
6967 [38864]: https://github.com/rust-lang/rust/issues/38864
6968 [38897]: https://github.com/rust-lang/rust/pull/38897
6969 [38921]: https://github.com/rust-lang/rust/pull/38921
6970 [38932]: https://github.com/rust-lang/rust/pull/38932
6971 [38945]: https://github.com/rust-lang/rust/pull/38945
6972 [38981]: https://github.com/rust-lang/rust/pull/38981
6973 [39002]: https://github.com/rust-lang/rust/pull/39002
6974 [39116]: https://github.com/rust-lang/rust/pull/39116
6975 [39193]: https://github.com/rust-lang/rust/pull/39193
6976 [39265]: https://github.com/rust-lang/rust/pull/39265
6977 [39356]: https://github.com/rust-lang/rust/pull/39356
6978 [39372]: https://github.com/rust-lang/rust/pull/39372
6979 [39426]: https://github.com/rust-lang/rust/pull/39426
6980 [39431]: https://github.com/rust-lang/rust/pull/39431
6981 [39438]: https://github.com/rust-lang/rust/pull/39438
6982 [39440]: https://github.com/rust-lang/rust/pull/39440
6983 [39485]: https://github.com/rust-lang/rust/pull/39485
6984 [39491]: https://github.com/rust-lang/rust/pull/39491
6985 [39518]: https://github.com/rust-lang/rust/pull/39518
6986 [39538]: https://github.com/rust-lang/rust/pull/39538
6987 [39572]: https://github.com/rust-lang/rust/pull/39572
6988 [39633]: https://github.com/rust-lang/rust/pull/39633
6989 [39642]: https://github.com/rust-lang/rust/pull/39642
6990 [39728]: https://github.com/rust-lang/rust/pull/39728
6991 [39761]: https://github.com/rust-lang/rust/pull/39761
6992 [39788]: https://github.com/rust-lang/rust/pull/39788
6993 [39793]: https://github.com/rust-lang/rust/pull/39793
6994 [39837]: https://github.com/rust-lang/rust/pull/39837
6995 [39843]: https://github.com/rust-lang/rust/pull/39843
6996 [39851]: https://github.com/rust-lang/rust/pull/39851
6997 [39903]: https://github.com/rust-lang/rust/pull/39903
6998 [39939]: https://github.com/rust-lang/rust/pull/39939
6999 [39953]: https://github.com/rust-lang/rust/pull/39953
7000 [39960]: https://github.com/rust-lang/rust/pull/39960
7001 [39990]: https://github.com/rust-lang/rust/pull/39990
7002 [39995]: https://github.com/rust-lang/rust/pull/39995
7003 [40008]: https://github.com/rust-lang/rust/pull/40008
7004 [40009]: https://github.com/rust-lang/rust/pull/40009
7005 [40027]: https://github.com/rust-lang/rust/pull/40027
7006 [40028]: https://github.com/rust-lang/rust/pull/40028
7007 [40037]: https://github.com/rust-lang/rust/pull/40037
7008 [40117]: https://github.com/rust-lang/rust/pull/40117
7009 [40166]: https://github.com/rust-lang/rust/pull/40166
7010 [40245]: https://github.com/rust-lang/rust/pull/40245
7011 [40257]: https://github.com/rust-lang/rust/pull/40257
7012 [40261]: https://github.com/rust-lang/rust/pull/40261
7013 [40265]: https://github.com/rust-lang/rust/pull/40265
7014 [40319]: https://github.com/rust-lang/rust/pull/40319
7015 [40336]: https://github.com/rust-lang/rust/pull/40336
7016 [40526]: https://github.com/rust-lang/rust/pull/40526
7017 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7018 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7019 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7020 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7021 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7022 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7023 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7024 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7025 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7026 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7027 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7028 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7029 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7030 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7031 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7032 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7033 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7034 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7035 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7036 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7037 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7038 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7039 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7040 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7041 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7042 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7043 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7044 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7045 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7046 [ubook]: https://doc.rust-lang.org/unstable-book/
7049 Version 1.16.0 (2017-03-16)
7050 ===========================
7055 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7056 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7057 match patterns][38069]
7058 * [Clean up semantics of `self` in an import list][38313]
7059 * [`Self` may appear in `impl` headers][38920]
7060 * [`Self` may appear in struct expressions][39282]
7065 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7066 a `.rmeta` file containing only crate metadata][38571]. This can be
7067 used by tools like the Rust Language Service to perform
7068 metadata-only builds.
7069 * [Levenshtein based typo suggestions now work in most places, while
7070 previously they worked only for fields and sometimes for local
7071 variables][38927]. Together with the overhaul of "no
7072 resolution"/"unexpected resolution" errors (#[38154]) they result in
7073 large and systematic improvement in resolution diagnostics.
7074 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7076 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7077 * [`rustc` no longer attempts to provide "consider using an explicit
7078 lifetime" suggestions][37057]. They were inaccurate.
7083 * [`VecDeque::truncate`]
7084 * [`VecDeque::resize`]
7085 * [`String::insert_str`]
7086 * [`Duration::checked_add`]
7087 * [`Duration::checked_sub`]
7088 * [`Duration::checked_div`]
7089 * [`Duration::checked_mul`]
7092 * [`SocketAddr::is_ipv4`]
7093 * [`SocketAddr::is_ipv6`]
7094 * [`IpAddr::is_ipv4`]
7095 * [`IpAddr::is_ipv6`]
7097 * [`Vec::dedup_by_key`]
7098 * [`Result::unwrap_or_default`]
7099 * [`<*const T>::wrapping_offset`]
7100 * [`<*mut T>::wrapping_offset`]
7101 * `CommandExt::creation_flags`
7102 * [`File::set_permissions`]
7103 * [`String::split_off`]
7108 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7109 their argument by `Borrow` parameter][37761]
7110 * [All public types in std implement `Debug`][38006]
7111 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7112 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7113 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7115 * [std: Fix partial writes in `LineWriter`][38062]
7116 * [std: Clamp max read/write sizes on Unix][38622]
7117 * [Use more specific panic message for `&str` slicing errors][38066]
7118 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7119 functionality cannot be achieved in std currently.
7120 * [`writeln!`, like `println!`, now accepts a form with no string
7121 or formatting arguments, to just print a newline][38469]
7122 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7123 * [Reduce the size of static data in `std_unicode::tables`][38781]
7124 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7125 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7127 * [`Duration` implements `Sum`][38712]
7128 * [`String` implements `ToSocketAddrs`][39048]
7133 * [The `cargo check` command does a type check of a project without
7134 building it][cargo/3296]
7135 * [crates.io will display CI badges from Travis and AppVeyor, if
7136 specified in Cargo.toml][cargo/3546]
7137 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7138 * [Compilation profiles accept integer values for `debug`, in addition
7139 to `true` and `false`. These are passed to `rustc` as the value to
7140 `-C debuginfo`][cargo/3534]
7141 * [Implement `cargo --version --verbose`][cargo/3604]
7142 * [All builds now output 'dep-info' build dependencies compatible with
7143 make and ninja][cargo/3557]
7144 * [Build all workspace members with `build --all`][cargo/3511]
7145 * [Document all workspace members with `doc --all`][cargo/3515]
7146 * [Path deps outside workspace are not members][cargo/3443]
7151 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7152 the path to the Rust implementation][38589]
7153 * [The `armv7-linux-androideabi` target no longer enables NEON
7154 extensions, per Google's ABI guide][38413]
7155 * [The stock standard library can be compiled for Redox OS][38401]
7156 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7158 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7160 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7165 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7166 match patterns][38069]
7167 * In this release, references to uninhabited types can not be
7168 pattern-matched. This was accidentally allowed in 1.15.
7169 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7170 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7172 * [Clean up semantics of `self` in an import list][38313]
7173 * Reimplemented lifetime elision. This change was almost entirely compatible
7174 with existing code, but it did close a number of small bugs and loopholes,
7175 as well as being more accepting in some other [cases][41105].
7177 [37057]: https://github.com/rust-lang/rust/pull/37057
7178 [37761]: https://github.com/rust-lang/rust/pull/37761
7179 [38006]: https://github.com/rust-lang/rust/pull/38006
7180 [38051]: https://github.com/rust-lang/rust/pull/38051
7181 [38062]: https://github.com/rust-lang/rust/pull/38062
7182 [38622]: https://github.com/rust-lang/rust/pull/38622
7183 [38066]: https://github.com/rust-lang/rust/pull/38066
7184 [38069]: https://github.com/rust-lang/rust/pull/38069
7185 [38131]: https://github.com/rust-lang/rust/pull/38131
7186 [38154]: https://github.com/rust-lang/rust/pull/38154
7187 [38274]: https://github.com/rust-lang/rust/pull/38274
7188 [38304]: https://github.com/rust-lang/rust/pull/38304
7189 [38313]: https://github.com/rust-lang/rust/pull/38313
7190 [38327]: https://github.com/rust-lang/rust/pull/38327
7191 [38401]: https://github.com/rust-lang/rust/pull/38401
7192 [38413]: https://github.com/rust-lang/rust/pull/38413
7193 [38469]: https://github.com/rust-lang/rust/pull/38469
7194 [38559]: https://github.com/rust-lang/rust/pull/38559
7195 [38571]: https://github.com/rust-lang/rust/pull/38571
7196 [38580]: https://github.com/rust-lang/rust/pull/38580
7197 [38589]: https://github.com/rust-lang/rust/pull/38589
7198 [38670]: https://github.com/rust-lang/rust/pull/38670
7199 [38712]: https://github.com/rust-lang/rust/pull/38712
7200 [38726]: https://github.com/rust-lang/rust/pull/38726
7201 [38781]: https://github.com/rust-lang/rust/pull/38781
7202 [38798]: https://github.com/rust-lang/rust/pull/38798
7203 [38909]: https://github.com/rust-lang/rust/pull/38909
7204 [38920]: https://github.com/rust-lang/rust/pull/38920
7205 [38927]: https://github.com/rust-lang/rust/pull/38927
7206 [39048]: https://github.com/rust-lang/rust/pull/39048
7207 [39282]: https://github.com/rust-lang/rust/pull/39282
7208 [39379]: https://github.com/rust-lang/rust/pull/39379
7209 [41105]: https://github.com/rust-lang/rust/issues/41105
7210 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7211 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7212 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7213 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7214 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7215 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7216 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7217 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7218 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7219 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7220 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7221 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7222 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7223 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7224 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7225 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7226 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7227 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7228 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7229 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7230 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7231 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7232 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7233 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7234 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7235 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7236 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7237 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7238 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7241 Version 1.15.1 (2017-02-09)
7242 ===========================
7244 * [Fix IntoIter::as_mut_slice's signature][39466]
7245 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7247 [39466]: https://github.com/rust-lang/rust/pull/39466
7248 [39523]: https://github.com/rust-lang/rust/pull/39523
7251 Version 1.15.0 (2017-02-02)
7252 ===========================
7257 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7258 stable. This allows popular code-generating crates like Serde and Diesel to
7259 work ergonomically. [RFC 1681].
7260 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7261 with curly braces][36868]. Part of [RFC 1506].
7262 * [A number of minor changes to name resolution have been activated][37127].
7263 They add up to more consistent semantics, allowing for future evolution of
7264 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7265 details of what is different. The breaking changes here have been transitioned
7266 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7267 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7269 * [`?Sized` can be used in `where` clauses][37791]
7270 * [There is now a limit on the size of monomorphized types and it can be
7271 modified with the `#![type_size_limit]` crate attribute, similarly to
7272 the `#![recursion_limit]` attribute][37789]
7277 * [On Windows, the compiler will apply dllimport attributes when linking to
7278 extern functions][37973]. Additional attributes and flags can control which
7279 library kind is linked and its name. [RFC 1717].
7280 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7281 * [The `--test` flag works with procedural macro crates][38107]
7282 * [Fix `extern "aapcs" fn` ABI][37814]
7283 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7284 * [The `format!` expander recognizes incorrect `printf` and shell-style
7285 formatting directives and suggests the correct format][37613].
7286 * [Only report one error for all unused imports in an import list][37456]
7288 Compiler Performance
7289 --------------------
7291 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7292 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7293 * [Don't clone in `UnificationTable::probe`][37848]
7294 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7295 * [Use small vectors in type walker][37760]
7296 * [Macro expansion performance was improved][37701]
7297 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7298 * [Replace FNV with a faster hash function][37229]
7303 * [`std::iter::Iterator::min_by`]
7304 * [`std::iter::Iterator::max_by`]
7305 * [`std::os::*::fs::FileExt`]
7306 * [`std::sync::atomic::Atomic*::get_mut`]
7307 * [`std::sync::atomic::Atomic*::into_inner`]
7308 * [`std::vec::IntoIter::as_slice`]
7309 * [`std::vec::IntoIter::as_mut_slice`]
7310 * [`std::sync::mpsc::Receiver::try_iter`]
7311 * [`std::os::unix::process::CommandExt::before_exec`]
7312 * [`std::rc::Rc::strong_count`]
7313 * [`std::rc::Rc::weak_count`]
7314 * [`std::sync::Arc::strong_count`]
7315 * [`std::sync::Arc::weak_count`]
7316 * [`std::char::encode_utf8`]
7317 * [`std::char::encode_utf16`]
7318 * [`std::cell::Ref::clone`]
7319 * [`std::io::Take::into_inner`]
7324 * [The standard sorting algorithm has been rewritten for dramatic performance
7325 improvements][38192]. It is a hybrid merge sort, drawing influences from
7326 Timsort. Previously it was a naive merge sort.
7327 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7328 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7330 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7331 and `char_indices().last()`][37882]
7332 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7333 * [Chinese characters display correctly in `fmt::Debug`][37855]
7334 * [Derive `Default` for `Duration`][37699]
7335 * [Support creation of anonymous pipes on WinXP/2k][37677]
7336 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7337 * [Don't pass overlapped handles to processes][38835]
7342 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7343 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7344 should instead check the variable at runtime with `std::env`. That the value
7345 was set at build time was a bug, and incorrect when cross-compiling. This
7346 change is known to cause breakage.
7347 * [Add `--all` flag to `cargo test`][cargo/3221]
7348 * [Compile statically against the MSVC CRT][cargo/3363]
7349 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7350 * [Link OpenSSL statically on OSX][cargo/3311]
7351 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7352 * [Test for bad path overrides with summaries][cargo/3336]
7353 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7354 * [Fix retrying crate downloads for network errors][cargo/3348]
7355 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7356 * [Emit more info on --message-format=json][cargo/3319]
7357 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7358 * [Don't ignore errors in workspace manifest][cargo/3409]
7359 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7364 * [Test runners (binaries built with `--test`) now support a `--list` argument
7365 that lists the tests it contains][38185]
7366 * [Test runners now support a `--exact` argument that makes the test filter
7367 match exactly, instead of matching only a substring of the test name][38181]
7368 * [rustdoc supports a `--playground-url` flag][37763]
7369 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7374 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7375 continue to be used in this release by passing `--disable-rustbuild` to the
7376 configure script, but they will be deleted soon. Note that the new build
7377 system uses a different on-disk layout that will likely affect any scripts
7379 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7381 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7382 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7388 * [A number of minor changes to name resolution have been activated][37127].
7389 They add up to more consistent semantics, allowing for future evolution of
7390 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7391 details of what is different. The breaking changes here have been transitioned
7392 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7393 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7394 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7395 should instead check the variable at runtime with `std::env`. That the value
7396 was set at build time was a bug, and incorrect when cross-compiling. This
7397 change is known to cause breakage.
7398 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7399 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7400 1.10 and is now an error by default. It will become a hard error in the near
7402 * [The semantics relating modules to file system directories are changing in
7403 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7404 lint, which is a warning in this release, and will become a hard error in the
7406 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7407 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7408 the underlying iterator][37834]
7410 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7411 [33685]: https://github.com/rust-lang/rust/issues/33685
7412 [36868]: https://github.com/rust-lang/rust/pull/36868
7413 [37127]: https://github.com/rust-lang/rust/pull/37127
7414 [37229]: https://github.com/rust-lang/rust/pull/37229
7415 [37456]: https://github.com/rust-lang/rust/pull/37456
7416 [37527]: https://github.com/rust-lang/rust/pull/37527
7417 [37602]: https://github.com/rust-lang/rust/pull/37602
7418 [37613]: https://github.com/rust-lang/rust/pull/37613
7419 [37615]: https://github.com/rust-lang/rust/pull/37615
7420 [37636]: https://github.com/rust-lang/rust/pull/37636
7421 [37627]: https://github.com/rust-lang/rust/pull/37627
7422 [37642]: https://github.com/rust-lang/rust/pull/37642
7423 [37677]: https://github.com/rust-lang/rust/pull/37677
7424 [37699]: https://github.com/rust-lang/rust/pull/37699
7425 [37701]: https://github.com/rust-lang/rust/pull/37701
7426 [37705]: https://github.com/rust-lang/rust/pull/37705
7427 [37749]: https://github.com/rust-lang/rust/pull/37749
7428 [37760]: https://github.com/rust-lang/rust/pull/37760
7429 [37763]: https://github.com/rust-lang/rust/pull/37763
7430 [37764]: https://github.com/rust-lang/rust/pull/37764
7431 [37789]: https://github.com/rust-lang/rust/pull/37789
7432 [37791]: https://github.com/rust-lang/rust/pull/37791
7433 [37814]: https://github.com/rust-lang/rust/pull/37814
7434 [37817]: https://github.com/rust-lang/rust/pull/37817
7435 [37834]: https://github.com/rust-lang/rust/pull/37834
7436 [37848]: https://github.com/rust-lang/rust/pull/37848
7437 [37855]: https://github.com/rust-lang/rust/pull/37855
7438 [37882]: https://github.com/rust-lang/rust/pull/37882
7439 [37888]: https://github.com/rust-lang/rust/pull/37888
7440 [37973]: https://github.com/rust-lang/rust/pull/37973
7441 [37979]: https://github.com/rust-lang/rust/pull/37979
7442 [38086]: https://github.com/rust-lang/rust/pull/38086
7443 [38107]: https://github.com/rust-lang/rust/pull/38107
7444 [38117]: https://github.com/rust-lang/rust/pull/38117
7445 [38134]: https://github.com/rust-lang/rust/pull/38134
7446 [38146]: https://github.com/rust-lang/rust/pull/38146
7447 [38181]: https://github.com/rust-lang/rust/pull/38181
7448 [38182]: https://github.com/rust-lang/rust/pull/38182
7449 [38185]: https://github.com/rust-lang/rust/pull/38185
7450 [38192]: https://github.com/rust-lang/rust/pull/38192
7451 [38279]: https://github.com/rust-lang/rust/pull/38279
7452 [38835]: https://github.com/rust-lang/rust/pull/38835
7453 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7454 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7455 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7456 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7457 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7458 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7459 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7460 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7461 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7462 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7463 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7464 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7465 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7466 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7467 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7468 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7469 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7470 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7471 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7472 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7473 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7474 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7475 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7476 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7477 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7478 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7479 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7480 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7481 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7482 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7483 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7484 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7485 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7486 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7487 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7488 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7489 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7492 Version 1.14.0 (2016-12-22)
7493 ===========================
7498 * [`..` matches multiple tuple fields in enum variants, structs
7499 and tuples][36843]. [RFC 1492].
7500 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7501 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7502 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7503 dereferencing][36822]
7508 * [Mark enums with non-zero discriminant as non-zero][37224]
7509 * [Lower-case `static mut` names are linted like other
7510 statics and consts][37162]
7511 * [Fix ICE on some macros in const integer positions
7512 (e.g. `[u8; m!()]`)][36819]
7513 * [Improve error message and snippet for "did you mean `x`"][36798]
7514 * [Add a panic-strategy field to the target specification][36794]
7515 * [Include LLVM version in `--version --verbose`][37200]
7517 Compile-time Optimizations
7518 --------------------------
7520 * [Improve macro expansion performance][37569]
7521 * [Shrink `Expr_::ExprInlineAsm`][37445]
7522 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7523 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7524 * [Avoid more allocations when compiling html5ever][37373]
7525 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7526 * [Avoid some allocations in the macro parser][37318]
7527 * [Use a faster deflate setting][37298]
7528 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7529 during interning of slices][37270]
7530 * [Optimize `write_metadata`][37267]
7531 * [Don't process obligation forest cycles when stalled][37231]
7532 * [Avoid many `CrateConfig` clones][37161]
7533 * [Optimize `Substs::super_fold_with`][37108]
7534 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7535 * [Speed up `plug_leaks`][36917]
7540 * [`println!()`, with no arguments, prints newline][36825].
7541 Previously, an empty string was required to achieve the same.
7542 * [`Wrapping` impls standard binary and unary operators, as well as
7543 the `Sum` and `Product` iterators][37356]
7544 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7546 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7547 `VecDeque` iterators][37315]
7548 * [Improve `SipHasher` performance on small values][37312]
7549 * [Add Iterator trait TrustedLen to enable better FromIterator /
7551 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7552 * [`ReadDir` implements `Debug`][37221]
7553 * [Implement `RefUnwindSafe` for atomic types][37178]
7554 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7555 * [Avoid allocations in `Decoder::read_str`][37064]
7556 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7557 * [Impl `Debug` for raw pointers to unsized data][36880]
7558 * [Don't reuse `HashMap` random seeds][37470]
7559 * [The internal memory layout of `HashMap` is more cache-friendly, for
7560 significant improvements in some operations][36692]
7561 * [`HashMap` uses less memory on 32-bit architectures][36595]
7562 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7567 * [Expose rustc cfg values to build scripts][cargo/3243]
7568 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7569 * [Fix passing --features when testing multiple packages][cargo/3280]
7570 * [Use a single profile set per workspace][cargo/3249]
7571 * [Load `replace` sections from lock files][cargo/3220]
7572 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7577 * [rustup is the recommended Rust installation method][1.14rustup]
7578 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7579 S390x. These are [tier 2] platforms and may have major defects. Follow the
7580 instructions on the website to install, or add the targets to an existing
7581 installation with `rustup target add`. The new target triples are:
7582 - `mips-unknown-linux-gnu`
7583 - `mipsel-unknown-linux-gnu`
7584 - `mips64-unknown-linux-gnuabi64`
7585 - `mips64el-unknown-linux-gnuabi64 `
7586 - `powerpc-unknown-linux-gnu`
7587 - `powerpc64-unknown-linux-gnu`
7588 - `powerpc64le-unknown-linux-gnu`
7589 - `s390x-unknown-linux-gnu `
7590 * This release includes target (std) builds for ARM Linux running MUSL
7591 libc. These are [tier 2] platforms and may have major defects. Add the
7592 following triples to an existing rustup installation with `rustup target add`:
7593 - `arm-unknown-linux-musleabi`
7594 - `arm-unknown-linux-musleabihf`
7595 - `armv7-unknown-linux-musleabihf`
7596 * This release includes [experimental support for WebAssembly][1.14wasm], via
7597 the `wasm32-unknown-emscripten` target. This target is known to have major
7598 defects. Please test, report, and fix.
7599 * rustup no longer installs documentation by default. Run `rustup
7600 component add rust-docs` to install.
7601 * [Fix line stepping in debugger][37310]
7602 * [Enable line number debuginfo in releases][37280]
7607 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7608 * [Add support for Fuchsia OS][37313]
7609 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7614 * [A number of forward-compatibility lints used by the compiler
7615 to gradually introduce language changes have been converted
7616 to deny by default][36894]:
7617 - ["use of inaccessible extern crate erroneously allowed"][36886]
7618 - ["type parameter default erroneously allowed in invalid location"][36887]
7619 - ["detects super or self keywords at the beginning of global path"][36888]
7620 - ["two overlapping inherent impls define an item with the same name
7621 were erroneously allowed"][36889]
7622 - ["floating-point constants cannot be used in patterns"][36890]
7623 - ["constants of struct or enum type can only be used in a pattern if
7624 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7625 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7626 * [Prohibit patterns in trait methods without bodies][37378]
7627 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7628 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7629 * [The `$crate` macro variable is accepted in fewer locations][37213]
7630 * [Impls specifying extra region requirements beyond the trait
7631 they implement are rejected][37167]
7632 * [Enums may not be unsized][37111]. Unsized enums are intended to
7633 work but never have. For now they are forbidden.
7634 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7636 [tier 2]: https://forge.rust-lang.org/platform-support.html
7637 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7638 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7639 [36430]: https://github.com/rust-lang/rust/pull/36430
7640 [36595]: https://github.com/rust-lang/rust/pull/36595
7641 [36692]: https://github.com/rust-lang/rust/pull/36692
7642 [36767]: https://github.com/rust-lang/rust/pull/36767
7643 [36794]: https://github.com/rust-lang/rust/pull/36794
7644 [36798]: https://github.com/rust-lang/rust/pull/36798
7645 [36819]: https://github.com/rust-lang/rust/pull/36819
7646 [36822]: https://github.com/rust-lang/rust/pull/36822
7647 [36825]: https://github.com/rust-lang/rust/pull/36825
7648 [36843]: https://github.com/rust-lang/rust/pull/36843
7649 [36880]: https://github.com/rust-lang/rust/pull/36880
7650 [36886]: https://github.com/rust-lang/rust/issues/36886
7651 [36887]: https://github.com/rust-lang/rust/issues/36887
7652 [36888]: https://github.com/rust-lang/rust/issues/36888
7653 [36889]: https://github.com/rust-lang/rust/issues/36889
7654 [36890]: https://github.com/rust-lang/rust/issues/36890
7655 [36891]: https://github.com/rust-lang/rust/issues/36891
7656 [36892]: https://github.com/rust-lang/rust/issues/36892
7657 [36894]: https://github.com/rust-lang/rust/pull/36894
7658 [36917]: https://github.com/rust-lang/rust/pull/36917
7659 [36993]: https://github.com/rust-lang/rust/pull/36993
7660 [37037]: https://github.com/rust-lang/rust/pull/37037
7661 [37064]: https://github.com/rust-lang/rust/pull/37064
7662 [37094]: https://github.com/rust-lang/rust/pull/37094
7663 [37108]: https://github.com/rust-lang/rust/pull/37108
7664 [37111]: https://github.com/rust-lang/rust/pull/37111
7665 [37161]: https://github.com/rust-lang/rust/pull/37161
7666 [37162]: https://github.com/rust-lang/rust/pull/37162
7667 [37167]: https://github.com/rust-lang/rust/pull/37167
7668 [37178]: https://github.com/rust-lang/rust/pull/37178
7669 [37200]: https://github.com/rust-lang/rust/pull/37200
7670 [37213]: https://github.com/rust-lang/rust/pull/37213
7671 [37221]: https://github.com/rust-lang/rust/pull/37221
7672 [37224]: https://github.com/rust-lang/rust/pull/37224
7673 [37230]: https://github.com/rust-lang/rust/pull/37230
7674 [37231]: https://github.com/rust-lang/rust/pull/37231
7675 [37247]: https://github.com/rust-lang/rust/pull/37247
7676 [37267]: https://github.com/rust-lang/rust/pull/37267
7677 [37270]: https://github.com/rust-lang/rust/pull/37270
7678 [37273]: https://github.com/rust-lang/rust/pull/37273
7679 [37280]: https://github.com/rust-lang/rust/pull/37280
7680 [37298]: https://github.com/rust-lang/rust/pull/37298
7681 [37306]: https://github.com/rust-lang/rust/pull/37306
7682 [37310]: https://github.com/rust-lang/rust/pull/37310
7683 [37312]: https://github.com/rust-lang/rust/pull/37312
7684 [37313]: https://github.com/rust-lang/rust/pull/37313
7685 [37315]: https://github.com/rust-lang/rust/pull/37315
7686 [37318]: https://github.com/rust-lang/rust/pull/37318
7687 [37322]: https://github.com/rust-lang/rust/pull/37322
7688 [37326]: https://github.com/rust-lang/rust/pull/37326
7689 [37351]: https://github.com/rust-lang/rust/pull/37351
7690 [37356]: https://github.com/rust-lang/rust/pull/37356
7691 [37367]: https://github.com/rust-lang/rust/pull/37367
7692 [37373]: https://github.com/rust-lang/rust/pull/37373
7693 [37378]: https://github.com/rust-lang/rust/pull/37378
7694 [37389]: https://github.com/rust-lang/rust/pull/37389
7695 [37392]: https://github.com/rust-lang/rust/pull/37392
7696 [37427]: https://github.com/rust-lang/rust/pull/37427
7697 [37439]: https://github.com/rust-lang/rust/pull/37439
7698 [37445]: https://github.com/rust-lang/rust/pull/37445
7699 [37470]: https://github.com/rust-lang/rust/pull/37470
7700 [37569]: https://github.com/rust-lang/rust/pull/37569
7701 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7702 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7703 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7704 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7705 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7706 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7707 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7710 Version 1.13.0 (2016-11-10)
7711 ===========================
7716 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7717 errors, like the `try!` macro, described in [RFC 0243].
7718 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7719 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7720 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7721 * [Fix lifetime rules for 'if' conditions][36029]
7722 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7727 * [Add the `-C link-arg` argument][36574]
7728 * [Remove the old AST-based backend from rustc_trans][35764]
7729 * [Don't enable NEON by default on armv7 Linux][35814]
7730 * [Fix debug line number info for macro expansions][35238]
7731 * [Do not emit "class method" debuginfo for types that are not
7732 DICompositeType][36008]
7733 * [Warn about multiple conflicting #[repr] hints][34623]
7734 * [When sizing DST, don't double-count nested struct prefixes][36351]
7735 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7736 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7737 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7738 * [Expand macros without recursing to avoid stack overflows][36214]
7743 * [Replace macro backtraces with labeled local uses][35702]
7744 * [Improve error message for misplaced doc comments][33922]
7745 * [Buffer unix and lock windows to prevent message interleaving][35975]
7746 * [Update lifetime errors to specifically note temporaries][36171]
7747 * [Special case a few colors for Windows][36178]
7748 * [Suggest `use self` when such an import resolves][36289]
7749 * [Be more specific when type parameter shadows primitive type][36338]
7750 * Many minor improvements
7752 Compile-time Optimizations
7753 --------------------------
7755 * [Compute and cache HIR hashes at beginning][35854]
7756 * [Don't hash types in loan paths][36004]
7757 * [Cache projections in trans][35761]
7758 * [Optimize the parser's last token handling][36527]
7759 * [Only instantiate #[inline] functions in codegen units referencing
7760 them][36524]. This leads to big improvements in cases where crates export
7761 define many inline functions without using them directly.
7762 * [Lazily allocate TypedArena's first chunk][36592]
7763 * [Don't allocate during default HashSet creation][36734]
7770 * [`overflowing_abs`]
7771 * [`RefCell::try_borrow`]
7772 * [`RefCell::try_borrow_mut`]
7777 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7778 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7780 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7781 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7782 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7783 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7784 * [Use arc4rand on FreeBSD][35884]
7785 * [memrchr: Correct aligned offset computation][35969]
7786 * [Improve Demangling of Rust Symbols][36059]
7787 * [Use monotonic time in condition variables][35048]
7788 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7789 * [Implement conversion traits for `char`][35755]
7790 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7791 * [Zero first byte of CString on drop][36264]
7792 * [Inherit overflow checks for sum and product][36372]
7793 * [Add missing Eq implementations][36423]
7794 * [Implement `Debug` for `DirEntry`][36631]
7795 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7797 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7798 * [Implement more traits for `std::io::ErrorKind`][35911]
7799 * [Optimize BinaryHeap bounds checking][36072]
7800 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7801 `extend_with_element`][36355]
7802 * [Fix overflow checking in unsigned pow()][34942]
7807 * This release includes security fixes to both curl and OpenSSL.
7808 * [Fix transitive doctests when panic=abort][cargo/3021]
7809 * [Add --all-features flag to cargo][cargo/3038]
7810 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7811 * [Don't parse the home directory more than once][cargo/3078]
7812 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7813 * [Update OpenSSL to 1.0.2j][cargo/3121]
7814 * [Add license and license_file to cargo metadata output][cargo/3110]
7815 * [Make crates-io registry URL optional in config; ignore all changes to
7816 source.crates-io][cargo/3089]
7817 * [Don't download dependencies from other platforms][cargo/3123]
7818 * [Build transitive dev-dependencies when needed][cargo/3125]
7819 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7820 * [Avoid updating registry when adding existing deps][cargo/3144]
7821 * [Warn about path overrides that won't work][cargo/3136]
7822 * [Use workspaces during `cargo install`][cargo/3146]
7823 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7824 * [Add --message-format flag][cargo/3000]
7825 * [Pass target environment for rustdoc][cargo/3205]
7826 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7827 * [Update curl and curl-sys][cargo/3241]
7828 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7833 * [rustdoc: Add the `--sysroot` argument][36586]
7834 * [rustdoc: Fix a couple of issues with the search results][35655]
7835 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7836 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7837 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7842 * [Remove unmaintained style guide][35124]
7843 * [Add s390x support][36369]
7844 * [Initial work at Haiku OS support][36727]
7845 * [Add mips-uclibc targets][35734]
7846 * [Crate-ify compiler-rt into compiler-builtins][35021]
7847 * [Add rustc version info (git hash + date) to dist tarball][36213]
7848 * Many documentation improvements
7853 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7854 * [Deny (by default) transmuting from fn item types to pointer-sized
7855 types][34923]. Continuing the long transition to zero-sized fn items,
7857 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7859 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7860 * [Fix lifetime rules for 'if' conditions][36029].
7861 * [Inherit overflow checks for sum and product][36372].
7862 * [Forbid user-defined macros named "macro_rules"][36730].
7864 [33922]: https://github.com/rust-lang/rust/pull/33922
7865 [34623]: https://github.com/rust-lang/rust/pull/34623
7866 [34923]: https://github.com/rust-lang/rust/pull/34923
7867 [34942]: https://github.com/rust-lang/rust/pull/34942
7868 [35021]: https://github.com/rust-lang/rust/pull/35021
7869 [35048]: https://github.com/rust-lang/rust/pull/35048
7870 [35074]: https://github.com/rust-lang/rust/pull/35074
7871 [35124]: https://github.com/rust-lang/rust/pull/35124
7872 [35234]: https://github.com/rust-lang/rust/pull/35234
7873 [35238]: https://github.com/rust-lang/rust/pull/35238
7874 [35354]: https://github.com/rust-lang/rust/pull/35354
7875 [35559]: https://github.com/rust-lang/rust/pull/35559
7876 [35585]: https://github.com/rust-lang/rust/pull/35585
7877 [35627]: https://github.com/rust-lang/rust/pull/35627
7878 [35655]: https://github.com/rust-lang/rust/pull/35655
7879 [35702]: https://github.com/rust-lang/rust/pull/35702
7880 [35707]: https://github.com/rust-lang/rust/pull/35707
7881 [35728]: https://github.com/rust-lang/rust/pull/35728
7882 [35734]: https://github.com/rust-lang/rust/pull/35734
7883 [35755]: https://github.com/rust-lang/rust/pull/35755
7884 [35761]: https://github.com/rust-lang/rust/pull/35761
7885 [35764]: https://github.com/rust-lang/rust/pull/35764
7886 [35814]: https://github.com/rust-lang/rust/pull/35814
7887 [35854]: https://github.com/rust-lang/rust/pull/35854
7888 [35871]: https://github.com/rust-lang/rust/pull/35871
7889 [35884]: https://github.com/rust-lang/rust/pull/35884
7890 [35911]: https://github.com/rust-lang/rust/pull/35911
7891 [35969]: https://github.com/rust-lang/rust/pull/35969
7892 [35975]: https://github.com/rust-lang/rust/pull/35975
7893 [36004]: https://github.com/rust-lang/rust/pull/36004
7894 [36008]: https://github.com/rust-lang/rust/pull/36008
7895 [36014]: https://github.com/rust-lang/rust/pull/36014
7896 [36029]: https://github.com/rust-lang/rust/pull/36029
7897 [36059]: https://github.com/rust-lang/rust/pull/36059
7898 [36072]: https://github.com/rust-lang/rust/pull/36072
7899 [36101]: https://github.com/rust-lang/rust/pull/36101
7900 [36104]: https://github.com/rust-lang/rust/pull/36104
7901 [36171]: https://github.com/rust-lang/rust/pull/36171
7902 [36173]: https://github.com/rust-lang/rust/pull/36173
7903 [36178]: https://github.com/rust-lang/rust/pull/36178
7904 [36213]: https://github.com/rust-lang/rust/pull/36213
7905 [36214]: https://github.com/rust-lang/rust/pull/36214
7906 [36264]: https://github.com/rust-lang/rust/pull/36264
7907 [36266]: https://github.com/rust-lang/rust/pull/36266
7908 [36289]: https://github.com/rust-lang/rust/pull/36289
7909 [36338]: https://github.com/rust-lang/rust/pull/36338
7910 [36351]: https://github.com/rust-lang/rust/pull/36351
7911 [36355]: https://github.com/rust-lang/rust/pull/36355
7912 [36369]: https://github.com/rust-lang/rust/pull/36369
7913 [36372]: https://github.com/rust-lang/rust/pull/36372
7914 [36423]: https://github.com/rust-lang/rust/pull/36423
7915 [36482]: https://github.com/rust-lang/rust/pull/36482
7916 [36505]: https://github.com/rust-lang/rust/pull/36505
7917 [36524]: https://github.com/rust-lang/rust/pull/36524
7918 [36527]: https://github.com/rust-lang/rust/pull/36527
7919 [36551]: https://github.com/rust-lang/rust/pull/36551
7920 [36574]: https://github.com/rust-lang/rust/pull/36574
7921 [36586]: https://github.com/rust-lang/rust/pull/36586
7922 [36592]: https://github.com/rust-lang/rust/pull/36592
7923 [36631]: https://github.com/rust-lang/rust/pull/36631
7924 [36721]: https://github.com/rust-lang/rust/pull/36721
7925 [36727]: https://github.com/rust-lang/rust/pull/36727
7926 [36730]: https://github.com/rust-lang/rust/pull/36730
7927 [36734]: https://github.com/rust-lang/rust/pull/36734
7928 [36754]: https://github.com/rust-lang/rust/pull/36754
7929 [36995]: https://github.com/rust-lang/rust/pull/36995
7930 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7931 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7932 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7933 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7934 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7935 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7936 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7937 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7938 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7939 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7940 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7941 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7942 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7943 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7944 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7945 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7946 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7947 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7948 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7949 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7950 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7951 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7952 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7953 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7954 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7955 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7956 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7957 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7958 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7959 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7960 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7961 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7964 Version 1.12.1 (2016-10-20)
7965 ===========================
7970 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7971 * [Confusion with double negation and booleans][36856]
7972 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7973 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7974 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7975 * [Corrupted memory after updated to 1.12][36936]
7976 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7977 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7978 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7980 [36381]: https://github.com/rust-lang/rust/issues/36381
7981 [36856]: https://github.com/rust-lang/rust/issues/36856
7982 [36875]: https://github.com/rust-lang/rust/issues/36875
7983 [36924]: https://github.com/rust-lang/rust/issues/36924
7984 [36926]: https://github.com/rust-lang/rust/issues/36926
7985 [36936]: https://github.com/rust-lang/rust/issues/36936
7986 [37026]: https://github.com/rust-lang/rust/issues/37026
7987 [37112]: https://github.com/rust-lang/rust/issues/37112
7988 [37153]: https://github.com/rust-lang/rust/issues/37153
7991 Version 1.12.0 (2016-09-29)
7992 ===========================
7997 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7998 This translation pass is far simpler than the previous AST->LLVM pass, and
7999 creates opportunities to perform new optimizations directly on the MIR. It
8000 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8001 * [`rustc` presents a new, more readable error format, along with
8002 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8003 Most common editors supporting Rust have been updated to work with it. It was
8004 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8009 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8010 This translation pass is far simpler than the previous AST->LLVM pass, and
8011 creates opportunities to perform new optimizations directly on the MIR. It
8012 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8013 * [Print the Rust target name, not the LLVM target name, with
8014 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8015 * [The computation of `TypeId` is correct in some cases where it was previously
8016 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8017 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8018 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8019 `--print relocation-models`, and `--print code-models` print the available
8020 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8021 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8022 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8023 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8024 These targets produce statically-linked binaries. There are no binary release
8030 * [`rustc` presents a new, more readable error format, along with
8031 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8032 Most common editors supporting Rust have been updated to work with it. It was
8033 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8034 * [In error descriptions, references are now described in plain English,
8035 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8036 * [In error type descriptions, unknown numeric types are named `{integer}` or
8037 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8038 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8043 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8044 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8045 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8046 useful](https://github.com/rust-lang/rust/pull/34908)
8047 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8048 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8049 * [Semicolons are properly required as statement delimiters inside
8050 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8051 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8056 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8057 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8058 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8059 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8060 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8061 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8062 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8063 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8064 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8065 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8066 Both on Unix and Windows.
8067 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8068 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8069 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8070 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8071 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8072 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8073 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8074 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8079 * [The `format!` macro and friends now allow a single argument to be formatted
8080 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8081 * [The lifetime bounds on `[T]::binary_search_by` and
8082 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8083 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8084 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8085 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8086 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8087 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8088 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8089 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8090 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8091 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8092 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8093 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8094 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8095 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8096 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8097 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8098 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8099 * [`mpsc::sync_channel` `Receiver`s return any available message before
8100 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8101 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8102 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8107 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8108 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8109 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8110 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8111 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8112 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8113 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8114 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8115 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8116 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8117 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8118 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8119 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8120 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8121 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8122 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8127 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8128 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8133 * [Test binaries now support a `--test-threads` argument to specify the number
8134 of threads used to run tests, and which acts the same as the
8135 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8136 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8137 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8138 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8139 * [Rust releases now come with source packages that can be installed by rustup
8140 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8141 The resulting source code can be used by tools and IDES, located in the
8142 sysroot under `lib/rustlib/src`.
8147 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8148 * Many minor improvements to the documentation.
8149 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8154 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8155 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8156 * [When formatting strings, if "precision" is specified, the "fill",
8157 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8158 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8161 Version 1.11.0 (2016-08-18)
8162 ===========================
8167 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8168 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8169 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8170 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8175 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8176 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8177 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8178 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8179 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8180 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8181 (in libcore - previously stabilized in libstd)
8182 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8183 (in libcore - previously stabilized in libstd)
8184 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8185 (in libcore - previously stabilized in libstd)
8186 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8187 (in libcore - previously stabilized in libstd)
8188 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8189 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8190 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8191 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8196 * [The `thread_local!` macro supports multiple definitions in a single
8197 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8198 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8199 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8200 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8201 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8202 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8203 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8204 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8209 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8210 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8211 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8212 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8213 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8214 and `-vv` prints warnings for all crates.
8215 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8216 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8217 This provides room for expansion by arbitrary tools.
8218 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8219 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8220 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8221 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8222 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8223 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8224 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8229 * [Caching projections speeds up type check dramatically for some
8230 workloads](https://github.com/rust-lang/rust/pull/33816)
8231 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8232 This hasher is faster, but is believed to provide sufficient
8233 protection from collision attacks.
8234 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8239 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8240 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8241 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8242 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8243 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8248 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8249 * [When emitting debug info, rustc emits frame pointers for closures,
8250 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8251 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8252 * Many more errors have been given error codes and extended
8254 * API documentation continues to be improved, with many new examples
8259 * [rustc no longer hangs when dependencies recursively re-export
8260 submodules](https://github.com/rust-lang/rust/pull/34542)
8261 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8262 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8263 rewritten](https://github.com/rust-lang/rust/pull/33895)
8264 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8265 No targets use this yet, but it works toward AVR support.
8270 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8271 * [The new follow-set rules that place restrictions on `macro_rules!`
8272 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8273 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8274 and has been a warning since 1.10.
8275 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8276 This causes breakage in some corner cases.
8279 Version 1.10.0 (2016-07-07)
8280 ===========================
8285 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8286 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8287 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8288 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8289 * [`panic!` can be converted to a runtime abort with the
8290 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8291 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8292 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8293 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8294 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8295 Note that Cargo does not yet directly support cdylibs.
8300 * `os::windows::fs::OpenOptionsExt::access_mode`
8301 * `os::windows::fs::OpenOptionsExt::share_mode`
8302 * `os::windows::fs::OpenOptionsExt::custom_flags`
8303 * `os::windows::fs::OpenOptionsExt::attributes`
8304 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8305 * `os::unix::fs::OpenOptionsExt::custom_flags`
8306 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8307 * `Default for sync::Weak`
8308 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8309 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8310 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8311 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8312 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8313 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8314 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8315 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8316 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8317 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8318 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8319 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8320 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8321 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8322 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8323 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8324 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8325 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8326 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8327 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8328 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8329 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8330 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8331 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8332 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8333 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8334 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8335 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8336 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8337 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8338 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8339 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8340 * Read/Write/RawFd impls for `UnixStream`
8341 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8342 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8343 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8344 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8345 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8346 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8347 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8348 * RawFd impls for `UnixListener`
8349 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8350 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8351 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8352 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8353 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8354 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8355 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8356 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8357 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8358 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8359 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8360 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8361 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8362 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8363 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8364 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8365 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8366 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8367 * RawFd impls for `UnixDatagram`
8368 * `{BTree,Hash}Map::values_mut`
8369 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8374 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8375 The semantics of this minor method are subtle and probably not what
8377 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8378 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8379 will fall back to `/dev/urandom` temporarily to avoid blocking
8380 during early boot](https://github.com/rust-lang/rust/pull/33086).
8381 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8382 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8383 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8384 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8385 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8386 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8387 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8391 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8392 This controls the runtime behavior of the `panic!` macro
8393 and can be either "unwind" (the default), or "abort".
8394 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8395 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8396 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8397 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8398 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8399 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8400 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8401 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8402 By default they are retried twice, which can be customized with the
8403 `net.retry` value in `.cargo/config`.
8404 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8405 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8406 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8407 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8408 Makes it possible to install multiple crates in parallel.
8409 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8410 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8411 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8412 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8413 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8414 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8419 * [rustc memory usage was reduced by refactoring the context used for
8420 type checking](https://github.com/rust-lang/rust/pull/33425).
8421 * [Speed up creation of `HashMap`s by caching the random keys used
8422 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8423 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8424 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8425 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8426 10x faster than the previous lookup tables.
8427 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8432 * Many incremental improvements to documentation and rustdoc.
8433 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8434 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8435 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8436 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8437 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8438 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8439 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8444 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8445 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8446 * [`std` no longer prints backtraces on platforms where the running
8447 module must be loaded with `env::current_exe`, which can't be relied
8448 on](https://github.com/rust-lang/rust/pull/33554).
8449 * This release includes std binaries for the i586-unknown-linux-gnu,
8450 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8451 i586 target is for old x86 hardware without SSE2, and the armv7
8452 target is for Android running on modern ARM architectures.
8453 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8454 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8455 * [On Unix the runtime aborts by calling `libc::abort` instead of
8456 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8457 * [Rust is now bootstrapped from the previous release of Rust,
8458 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8463 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8464 * [`target_env` for Linux ARM targets is just `gnu`, not
8465 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8466 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8467 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8468 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8469 Affects how macros are parsed.
8470 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8471 * [Feature-gated attributes on macro-generated macro invocations are
8472 now rejected](https://github.com/rust-lang/rust/pull/32791).
8473 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8474 This caused some minor changes to type inference.
8477 Version 1.9.0 (2016-05-26)
8478 ==========================
8483 * The `#[deprecated]` attribute when applied to an API will generate
8484 warnings when used. The warnings may be suppressed with
8485 `#[allow(deprecated)]`. [RFC 1270].
8486 * [`fn` item types are zero sized, and each `fn` names a unique
8487 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8488 `transmute` on a `fn` type will generate a warning for a few cycles,
8489 then will be converted to an error.
8490 * [Field and method resolution understand visibility, so private
8491 fields and methods cannot prevent the proper use of public fields
8492 and methods][1.9fv].
8493 * [The parser considers unicode codepoints in the
8494 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8500 * [`std::panic::catch_unwind`] (renamed from `recover`)
8501 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8502 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8503 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8504 * [`str::is_char_boundary`]
8505 * [`<*const T>::as_ref`]
8506 * [`<*mut T>::as_ref`]
8507 * [`<*mut T>::as_mut`]
8508 * [`AsciiExt::make_ascii_uppercase`]
8509 * [`AsciiExt::make_ascii_lowercase`]
8510 * [`char::decode_utf16`]
8511 * [`char::DecodeUtf16`]
8512 * [`char::DecodeUtf16Error`]
8513 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8514 * [`BTreeSet::take`]
8515 * [`BTreeSet::replace`]
8518 * [`HashSet::replace`]
8520 * [`OsString::with_capacity`]
8521 * [`OsString::clear`]
8522 * [`OsString::capacity`]
8523 * [`OsString::reserve`]
8524 * [`OsString::reserve_exact`]
8525 * [`OsStr::is_empty`]
8527 * [`std::os::unix::thread`]
8530 * [`JoinHandleExt::as_pthread_t`]
8531 * [`JoinHandleExt::into_pthread_t`]
8532 * [`HashSet::hasher`]
8533 * [`HashMap::hasher`]
8534 * [`CommandExt::exec`]
8535 * [`File::try_clone`]
8536 * [`SocketAddr::set_ip`]
8537 * [`SocketAddr::set_port`]
8538 * [`SocketAddrV4::set_ip`]
8539 * [`SocketAddrV4::set_port`]
8540 * [`SocketAddrV6::set_ip`]
8541 * [`SocketAddrV6::set_port`]
8542 * [`SocketAddrV6::set_flowinfo`]
8543 * [`SocketAddrV6::set_scope_id`]
8544 * [`slice::copy_from_slice`]
8545 * [`ptr::read_volatile`]
8546 * [`ptr::write_volatile`]
8547 * [`OpenOptions::create_new`]
8548 * [`TcpStream::set_nodelay`]
8549 * [`TcpStream::nodelay`]
8550 * [`TcpStream::set_ttl`]
8551 * [`TcpStream::ttl`]
8552 * [`TcpStream::set_only_v6`]
8553 * [`TcpStream::only_v6`]
8554 * [`TcpStream::take_error`]
8555 * [`TcpStream::set_nonblocking`]
8556 * [`TcpListener::set_ttl`]
8557 * [`TcpListener::ttl`]
8558 * [`TcpListener::set_only_v6`]
8559 * [`TcpListener::only_v6`]
8560 * [`TcpListener::take_error`]
8561 * [`TcpListener::set_nonblocking`]
8562 * [`UdpSocket::set_broadcast`]
8563 * [`UdpSocket::broadcast`]
8564 * [`UdpSocket::set_multicast_loop_v4`]
8565 * [`UdpSocket::multicast_loop_v4`]
8566 * [`UdpSocket::set_multicast_ttl_v4`]
8567 * [`UdpSocket::multicast_ttl_v4`]
8568 * [`UdpSocket::set_multicast_loop_v6`]
8569 * [`UdpSocket::multicast_loop_v6`]
8570 * [`UdpSocket::set_multicast_ttl_v6`]
8571 * [`UdpSocket::multicast_ttl_v6`]
8572 * [`UdpSocket::set_ttl`]
8573 * [`UdpSocket::ttl`]
8574 * [`UdpSocket::set_only_v6`]
8575 * [`UdpSocket::only_v6`]
8576 * [`UdpSocket::join_multicast_v4`]
8577 * [`UdpSocket::join_multicast_v6`]
8578 * [`UdpSocket::leave_multicast_v4`]
8579 * [`UdpSocket::leave_multicast_v6`]
8580 * [`UdpSocket::take_error`]
8581 * [`UdpSocket::connect`]
8582 * [`UdpSocket::send`]
8583 * [`UdpSocket::recv`]
8584 * [`UdpSocket::set_nonblocking`]
8589 * [`std::sync::Once` is poisoned if its initialization function
8591 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8592 * [Most types implement `fmt::Debug`][1.9db].
8593 * [The default buffer size used by `BufReader` and `BufWriter` was
8594 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8595 used by other languages.
8596 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8597 `Duration` additionally implements `*=` and `/=`][1.9ta].
8598 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8599 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8600 * [`Chain` implements `BufRead`][1.9ch].
8601 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8606 * [Cargo can now run concurrently][1.9cc].
8607 * [Top-level overrides allow specific revisions of crates to be
8608 overridden through the entire crate graph][1.9ct]. This is intended
8609 to make upgrades easier for large projects, by allowing crates to be
8610 forked temporarily until they've been upgraded and republished.
8611 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8612 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8613 on the commandline][1.9cf]. `rustc` arguments can also be specified
8614 in the `build.rustflags` configuration key.
8619 * [The time complexity of comparing variables for equivalence during type
8620 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8621 to major compilation time improvement in some scenarios.
8622 * [`ToString` is specialized for `str`, giving it the same performance
8623 as `to_owned`][1.9ts].
8624 * [Spawning processes with `Command::output` no longer creates extra
8626 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8627 for C-like enums][1.9cl].
8632 * [Passing the `--quiet` flag to a test runner will produce
8633 much-abbreviated output][1.9q].
8634 * The Rust Project now publishes std binaries for the
8635 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8636 `i586-pc-windows-msvc` targets.
8641 * [`std::sync::Once` is poisoned if its initialization function
8643 * [It is illegal to define methods with the same name in overlapping
8644 inherent `impl` blocks][1.9sn].
8645 * [`fn` item types are zero sized, and each `fn` names a unique
8646 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8647 `transmute` on a `fn` type will generate a warning for a few cycles,
8648 then will be converted to an error.
8649 * [Improvements to const evaluation may trigger new errors when integer
8650 literals are out of range][1.9ce].
8653 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8654 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8655 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8656 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8657 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8658 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8659 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8660 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8661 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8662 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8663 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8664 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8665 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8666 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8667 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8668 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8669 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8670 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8671 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8672 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8673 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8674 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8675 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8676 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8677 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8678 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8679 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8680 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8681 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8682 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8683 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8684 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8685 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8686 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8687 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8688 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8689 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8690 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8691 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8692 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8693 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8694 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8695 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8696 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8697 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8698 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8699 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8700 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8701 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8702 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8703 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8704 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8705 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8706 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8707 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8708 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8709 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8710 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8711 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8712 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8713 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8714 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8715 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8716 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8717 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8718 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8719 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8720 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8721 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8722 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8723 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8724 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8725 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8726 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8727 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8728 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8729 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8730 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8731 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8732 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8733 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8734 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8735 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8736 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8737 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8738 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8739 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8740 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8741 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8742 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8743 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8744 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8745 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8746 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8747 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8748 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8749 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8750 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8751 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8752 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8753 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8754 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8755 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8756 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8757 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8758 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8759 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8760 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8761 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8762 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8765 Version 1.8.0 (2016-04-14)
8766 ==========================
8771 * Rust supports overloading of compound assignment statements like
8772 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8773 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8774 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8776 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8777 addition to the non-braced form, `struct Foo;`. [RFC 218].
8783 * [`str::encode_utf16`] (renamed from `utf16_units`)
8784 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8787 * [`ptr::drop_in_place`]
8789 * [`time::SystemTime`]
8791 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8792 * [`Instant::elapsed`]
8793 * [`SystemTime::now`]
8794 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8795 * [`SystemTime::elapsed`]
8796 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8797 * [`SystemTimeError`]
8798 * [`SystemTimeError::duration`]
8799 * Various impls for `SystemTimeError`
8801 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8802 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8803 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8804 * [The `write!` and `writeln!` macros correctly emit errors if any of
8805 their arguments can't be formatted][1.8w].
8806 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8807 * [The Unix-specific `raw` modules, which contain a number of
8808 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8809 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8810 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8811 across platforms was making it difficult to implement `std`
8812 correctly. Those that need these definitions should use the `libc`
8814 * The Unix-specific `MetadataExt` traits, including
8815 `os::unix::fs::MetadataExt`, which expose values such as inode
8816 numbers [no longer return platform-specific types][1.8r], but
8817 instead return widened integers. [RFC 1415].
8818 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8819 * [Atomic loads and stores are not volatile][1.8a].
8820 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8825 * [Inlining hash functions lead to a 3% compile-time improvement in
8826 some workloads][1.8h].
8827 * When using jemalloc, its symbols are [unprefixed so that it
8828 overrides the libc malloc implementation][1.8h]. This means that for
8829 rustc, LLVM is now using jemalloc, which results in a 6%
8830 compile-time improvement on a specific workload.
8831 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8836 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8837 i686-pc-windows-msvc is now considered a tier-1 platform.
8838 * [The `--print targets` flag prints a list of supported targets][1.8t].
8839 * [The `--print cfg` flag prints the `cfg`s defined for the current
8841 * [`rustc` can be built with an new Cargo-based build system, written
8842 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8843 build system. To enable it configure with `configure --rustbuild`.
8844 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8845 variants while also indicating the total number of missing variants
8846 if more than 3][1.8m].
8847 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8848 * The Rust Project now publishes binary releases of the standard
8849 library for a number of tier-2 targets:
8850 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8851 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8852 `x86_64-rumprun-netbsd`. These can be installed with
8853 tools such as [multirust][1.8mr].
8858 * [`cargo init` creates a new Cargo project in the current
8859 directory][1.8ci]. It is otherwise like `cargo new`.
8860 * [Cargo has configuration keys for `-v` and
8861 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8862 `[term]` section of `.cargo/config`.
8863 * [Configuration keys that evaluate to strings or integers can be set
8864 via environment variables][1.8ce]. For example the `build.jobs` key
8865 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8866 precedence over config files.
8867 * [Target-specific dependencies support Rust `cfg` syntax for
8868 describing targets][1.8cfg] so that dependencies for multiple
8869 targets can be specified together. [RFC 1361].
8870 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8871 `RUSTDOC` take precedence over the `build.target-dir`,
8872 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8873 * [The child process tree is killed on Windows when Cargo is
8875 * [The `build.target` configuration value sets the target platform,
8876 like `--target`][1.8ct].
8881 * [Unstable compiler flags have been further restricted][1.8u]. Since
8882 1.0 `-Z` flags have been considered unstable, and other flags that
8883 were considered unstable additionally required passing `-Z
8884 unstable-options` to access. Unlike unstable language and library
8885 features though, these options have been accessible on the stable
8886 release channel. Going forward, *new unstable flags will not be
8887 available on the stable release channel*, and old unstable flags
8888 will warn about their usage. In the future, all unstable flags will
8889 be unavailable on the stable release channel.
8890 * [It is no longer possible to `match` on empty enum variants using
8891 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8892 * The Unix-specific `MetadataExt` traits, including
8893 `os::unix::fs::MetadataExt`, which expose values such as inode
8894 numbers [no longer return platform-specific types][1.8r], but
8895 instead return widened integers. [RFC 1415].
8896 * [Modules sourced from the filesystem cannot appear within arbitrary
8897 blocks, but only within other modules][1.8mf].
8898 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8899 * On Unix, [stack overflow triggers a runtime abort instead of a
8901 * [`Command::spawn` and its equivalents return an error if any of
8902 its command-line arguments contain interior `NUL`s][1.8n].
8903 * [Tuple and unit enum variants from other crates are in the type
8905 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8906 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8907 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8908 instead of `foo.lib`.
8911 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8912 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8913 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8914 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8915 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8916 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8917 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8918 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8919 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8920 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8921 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8922 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8923 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8924 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8925 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8926 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8927 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8928 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8929 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8930 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8931 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8932 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8933 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8934 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8935 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8936 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8937 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8938 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8939 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8940 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8941 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8942 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8943 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8944 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8945 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8946 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8947 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8948 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8949 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8950 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8951 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8952 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8953 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8954 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8955 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8956 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8957 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8958 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8959 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8960 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8961 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8962 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8963 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8964 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8965 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8966 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8967 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8968 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8969 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8970 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8973 Version 1.7.0 (2016-03-03)
8974 ==========================
8981 * [`Path::strip_prefix`] (renamed from relative_from)
8982 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8984 * [`Ipv4Addr::is_loopback`]
8985 * [`Ipv4Addr::is_private`]
8986 * [`Ipv4Addr::is_link_local`]
8987 * [`Ipv4Addr::is_multicast`]
8988 * [`Ipv4Addr::is_broadcast`]
8989 * [`Ipv4Addr::is_documentation`]
8991 * [`Ipv6Addr::is_unspecified`]
8992 * [`Ipv6Addr::is_loopback`]
8993 * [`Ipv6Addr::is_multicast`]
8996 * [`Vec::as_mut_slice`]
8998 * [`String::as_str`]
8999 * [`String::as_mut_str`]
9001 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9003 * `<[T]>::`[`sort_by_key`]
9004 * checked, saturated, and overflowing operations
9005 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9006 * [`i32::saturating_mul`]
9007 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9008 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9009 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9010 * [`u32::saturating_mul`]
9011 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9012 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9013 * and checked, saturated, and overflowing operations for other primitive types
9015 * [`ffi::IntoStringError`]
9016 * [`CString::into_string`]
9017 * [`CString::into_bytes`]
9018 * [`CString::into_bytes_with_nul`]
9019 * `From<CString> for Vec<u8>`
9021 * [`IntoStringError::into_cstring`]
9022 * [`IntoStringError::utf8_error`]
9023 * `Error for IntoStringError`
9025 * [`std::hash::BuildHasher`]
9026 * [`BuildHasher::Hasher`]
9027 * [`BuildHasher::build_hasher`]
9028 * [`std::hash::BuildHasherDefault`]
9029 * [`HashMap::with_hasher`]
9030 * [`HashMap::with_capacity_and_hasher`]
9031 * [`HashSet::with_hasher`]
9032 * [`HashSet::with_capacity_and_hasher`]
9033 * [`std::collections::hash_map::RandomState`]
9034 * [`RandomState::new`]
9035 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9036 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9037 from bytes is faster.
9038 * [The performance of `LineWriter` (and thus `io::stdout`) was
9039 improved by using `memchr` to search for newlines][1.7m].
9040 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9041 `f64` variants were stabilized previously.
9042 * [`BTreeMap` was rewritten to use less memory and improve the performance
9043 of insertion and iteration, the latter by as much as 5x][1.7bm].
9044 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9045 covariant over their contained type][1.7bt].
9046 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9047 over their contained type][1.7ll].
9048 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9050 * [`Any` is implemented for unsized types][1.7a].
9051 * [`Hash` is implemented for `Duration`][1.7h].
9056 * [When running tests with `--test`, rustdoc will pass `--cfg`
9057 arguments to the compiler][1.7dt].
9058 * [The compiler is built with RPATH information by default][1.7rpa].
9059 This means that it will be possible to run `rustc` when installed in
9060 unusual configurations without configuring the dynamic linker search
9062 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9063 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9064 over `LD_LIBRARY_PATH`.
9069 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9070 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9071 * [The `rerun-if-changed` build script directive no longer causes the
9072 build script to incorrectly run twice in certain scenarios][1.7rr].
9077 * Soundness fixes to the interactions between associated types and
9078 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9079 code that violates the new rules. This is a significant change that
9080 is known to break existing code, so it has emitted warnings for the
9081 new error cases since 1.4 to give crate authors time to adapt. The
9082 details of what is changing are subtle; read the RFC for more.
9083 * [Several bugs in the compiler's visibility calculations were
9084 fixed][1.7v]. Since this was found to break significant amounts of
9085 code, the new errors will be emitted as warnings for several release
9086 cycles, under the `private_in_public` lint.
9087 * Defaulted type parameters were accidentally accepted in positions
9088 that were not intended. In this release, [defaulted type parameters
9089 appearing outside of type definitions will generate a
9090 warning][1.7d], which will become an error in future releases.
9091 * [Parsing "." as a float results in an error instead of 0][1.7p].
9092 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9093 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9095 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9096 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9097 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9098 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9099 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9100 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9101 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9102 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9103 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9104 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9105 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9106 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9107 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9108 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9109 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9110 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9111 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9112 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9113 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9114 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9115 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9116 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9117 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9118 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9119 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9120 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9121 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9122 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9123 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9124 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9125 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9126 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9127 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9128 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9129 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9130 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9131 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9132 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9133 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9134 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9135 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9136 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9137 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9138 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9139 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9140 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9141 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9142 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9143 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9144 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9145 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9146 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9147 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9148 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9149 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9150 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9151 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9152 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9153 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9154 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9155 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9156 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9157 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9158 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9159 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9160 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9161 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9162 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9163 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9164 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9165 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9166 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9167 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9168 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9169 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9170 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9171 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9172 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9173 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9176 Version 1.6.0 (2016-01-21)
9177 ==========================
9182 * The `#![no_std]` attribute causes a crate to not be linked to the
9183 standard library, but only the [core library][1.6co], as described
9184 in [RFC 1184]. The core library defines common types and traits but
9185 has no platform dependencies whatsoever, and is the basis for Rust
9186 software in environments that cannot support a full port of the
9187 standard library, such as operating systems. Most of the core
9188 library is now stable.
9194 [`Read::read_exact`],
9195 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9196 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9197 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9198 [`os::unix::fs::DirBuilderExt`],
9199 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9200 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9201 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9202 [`collections::hash_map::Drain`],
9203 [`collections::hash_map::HashMap::drain`],
9204 [`collections::hash_set::Drain`],
9205 [`collections::hash_set::HashSet::drain`],
9206 [`collections::binary_heap::Drain`],
9207 [`collections::binary_heap::BinaryHeap::drain`],
9208 [`Vec::extend_from_slice`] (renamed from `push_all`),
9209 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9210 [`RwLock::into_inner`],
9211 [`Iterator::min_by_key`] (renamed from `min_by`),
9212 [`Iterator::max_by_key`] (renamed from `max_by`).
9213 * The [core library][1.6co] is stable, as are most of its APIs.
9214 * [The `assert_eq!` macro supports arguments that don't implement
9215 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9217 * Several timer functions that take duration in milliseconds [are
9218 deprecated in favor of those that take `Duration`][1.6ms]. These
9219 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9220 `thread::park_timeout_ms`.
9221 * The algorithm by which `Vec` reserves additional elements was
9222 [tweaked to not allocate excessive space][1.6a] while still growing
9224 * `From` conversions are [implemented from integers to floats][1.6f]
9225 in cases where the conversion is lossless. Thus they are not
9226 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9227 or `f64`. They are also not implemented for `isize` and `usize`
9228 because the implementations would be platform-specific. `From` is
9229 also implemented from `f32` to `f64`.
9230 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9231 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9232 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9233 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9235 * Sorting slices that are already sorted [is 50% faster in some
9241 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9242 * Cargo build scripts can specify their dependencies by emitting the
9243 [`rerun-if-changed`][1.6rr] key.
9244 * crates.io will reject publication of crates with dependencies that
9245 have a wildcard version constraint. Crates with wildcard
9246 dependencies were seen to cause a variety of problems, as described
9247 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9249 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9250 release folder. A variety of artifacts that Cargo failed to clean
9251 are now correctly deleted.
9256 * The `unreachable_code` lint [warns when a function call's argument
9258 * The parser indicates [failures that may be caused by
9259 confusingly-similar Unicode characters][1.6uc]
9260 * Certain macro errors [are reported at definition time][1.6m], not
9266 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9267 environment variable when locating crates. This was a pre-cargo
9268 feature for integrating with the package manager that was
9269 accidentally never removed.
9270 * [A number of bugs were fixed in the privacy checker][1.6p] that
9271 could cause previously-accepted code to break.
9272 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9273 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9274 struct pattern syntax (`Foo(..)`) can no longer be used to match
9275 unit structs. This is a warning now, but will become an error in
9276 future releases. Patterns that share the same name as a const are
9278 * A bug was fixed that causes [rustc not to apply default type
9279 parameters][1.6xc] when resolving certain method implementations of
9280 traits defined in other crates.
9282 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9283 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9284 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9285 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9286 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9287 [1.6co]: http://doc.rust-lang.org/core/index.html
9288 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9289 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9290 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9291 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9292 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9293 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9294 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9295 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9296 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9297 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9298 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9299 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9300 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9301 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9302 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9303 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9304 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9305 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9306 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9307 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9308 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9309 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9310 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9311 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9312 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9313 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9314 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9315 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9316 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9317 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9318 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9319 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9320 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9321 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9322 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9323 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9324 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9325 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9326 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9327 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9328 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9331 Version 1.5.0 (2015-12-10)
9332 ==========================
9334 * ~700 changes, numerous bugfixes
9340 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9341 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9342 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9343 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9344 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9345 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9346 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9347 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9348 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9349 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9350 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9351 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9352 [`Path::read_link`], [`Path::symlink_metadata`],
9353 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9354 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9355 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9356 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9357 [`slice::split_first_mut`], [`slice::split_first`],
9358 [`slice::split_last_mut`], [`slice::split_last`],
9359 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9360 [`str::MatchIndices`], [`str::RMatchIndices`],
9361 [`str::match_indices`], [`str::rmatch_indices`],
9362 [`str::slice_mut_unchecked`], [`string::ParseError`].
9363 * Rust applications hosted on crates.io can be installed locally to
9364 `~/.cargo/bin` with the [`cargo install`] command. Among other
9365 things this makes it easier to augment Cargo with new subcommands:
9366 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9367 invoked as `cargo foo`.
9368 * Crates with wildcard (`*`) dependencies will [emit warnings when
9369 published][1.5w]. In 1.6 it will no longer be possible to publish
9370 crates with wildcard dependencies.
9375 * The rules determining when a particular lifetime must outlive
9376 a particular value (known as '[dropck]') have been [modified
9377 to not rely on parametricity][1.5p].
9378 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9379 and `Arc`][1.5a]. Because these smart pointer types implement
9380 `Deref`, this causes breakage in cases where the interior type
9381 contains methods of the same name.
9382 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9383 that they could drop their content. Soundness fix.
9384 * All method invocations are [properly checked][1.5wf1] for
9385 [well-formedness][1.5wf2]. Soundness fix.
9386 * Traits whose supertraits contain `Self` are [not object
9387 safe][1.5o]. Soundness fix.
9388 * Target specifications support a [`no_default_libraries`][1.5nd]
9389 setting that controls whether `-nodefaultlibs` is passed to the
9390 linker, and in turn the `is_like_windows` setting no longer affects
9391 the `-nodefaultlibs` flag.
9392 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9393 * The `#[inline]` and `#[repr]` attributes [can only appear
9394 in valid locations][1.5at].
9395 * Native libraries linked from the local crate are [passed to
9396 the linker before native libraries from upstream crates][1.5nl].
9397 * Two rarely-used attributes, `#[no_debug]` and
9398 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9399 * Negation of unsigned integers, which has been a warning for
9400 several releases, [is now behind a feature gate and will
9401 generate errors][1.5nu].
9402 * The parser accidentally accepted visibility modifiers on
9403 enum variants, a bug [which has been fixed][1.5ev].
9404 * [A bug was fixed that allowed `use` statements to import unstable
9410 * When evaluating expressions at compile-time that are not
9411 compile-time constants (const-evaluating expressions in non-const
9412 contexts), incorrect code such as overlong bitshifts and arithmetic
9413 overflow will [generate a warning instead of an error][1.5ce],
9414 delaying the error until runtime. This will allow the
9415 const-evaluator to be expanded in the future backwards-compatibly.
9416 * The `improper_ctypes` lint [no longer warns about using `isize` and
9417 `usize` in FFI][1.5ict].
9422 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9424 * `Default` is [implemented for mutable slices][1.5d].
9425 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9426 * There are now `From` conversions [between floating point
9427 types][1.5f] where the conversions are lossless.
9428 * There are now `From` conversions [between integer types][1.5i] where
9429 the conversions are lossless.
9430 * [`fs::Metadata` implements `Clone`][1.5fs].
9431 * The `parse` method [accepts a leading "+" when parsing
9433 * [`AsMut` is implemented for `Vec`][1.5am].
9434 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9435 been optimized][1.5cf] and no longer rely on the default impl.
9436 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9437 `unsafe extern "C"` function types now [implement `Clone`,
9438 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9439 `fmt::Debug` for up to 12 arguments][1.5fp].
9440 * [Dropping `Vec`s is much faster in unoptimized builds when the
9441 element types don't implement `Drop`][1.5dv].
9442 * A bug that caused in incorrect behavior when [combining `VecDeque`
9443 with zero-sized types][1.5vdz] was resolved.
9444 * [`PartialOrd` for slices is faster][1.5po].
9449 * [Crate metadata size was reduced by 20%][1.5md].
9450 * [Improvements to code generation reduced the size of libcore by 3.3
9451 MB and rustc's memory usage by 18MB][1.5m].
9452 * [Improvements to deref translation increased performance in
9453 unoptimized builds][1.5dr].
9454 * Various errors in trait resolution [are deduplicated to only be
9455 reported once][1.5te].
9456 * Rust has preliminary [support for rumprun kernels][1.5rr].
9457 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9459 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9460 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9461 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9462 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9463 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9464 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9465 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9466 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9467 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9468 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9469 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9470 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9471 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9472 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9473 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9474 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9475 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9476 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9477 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9478 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9479 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9480 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9481 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9482 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9483 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9484 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9485 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9486 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9487 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9488 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9489 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9490 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9491 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9492 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9493 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9494 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9495 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9496 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9497 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9498 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9499 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9500 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9501 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9502 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9503 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9504 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9505 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9506 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9507 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9508 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9509 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9510 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9511 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9512 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9513 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9514 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9515 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9516 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9517 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9518 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9519 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9520 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9521 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9522 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9523 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9524 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9525 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9526 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9527 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9528 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9529 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9530 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9531 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9532 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9533 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9534 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9535 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9536 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9537 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9538 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9539 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9540 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9541 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9542 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9543 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9544 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9545 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9546 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9547 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9549 Version 1.4.0 (2015-10-29)
9550 ==========================
9552 * ~1200 changes, numerous bugfixes
9557 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9558 GNU) are now supported and recommended for use.
9563 * [Several changes have been made to fix type soundness and improve
9564 the behavior of associated types][sound]. See [RFC 1214]. Although
9565 we have mostly introduced these changes as warnings this release, to
9566 become errors next release, there are still some scenarios that will
9567 see immediate breakage.
9568 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9569 line breaks in addition to `\n`][crlf].
9570 * [Loans of `'static` lifetime extend to the end of a function][stat].
9571 * [`str::parse` no longer introduces avoidable rounding error when
9572 parsing floating point numbers. Together with earlier changes to
9573 float formatting/output, "round trips" like f.to_string().parse()
9574 now preserve the value of f exactly. Additionally, leading plus
9575 signs are now accepted][fp3].
9581 * `use` statements that import multiple items [can now rename
9582 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9583 * [Binops work correctly on fat pointers][binfat].
9584 * `pub extern crate`, which does not behave as expected, [issues a
9585 warning][pec] until a better solution is found.
9590 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9591 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9592 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9593 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9594 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9595 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9596 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9597 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9598 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9599 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9600 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9601 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9602 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9603 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9604 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9605 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9606 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9607 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9609 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9610 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9611 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9612 `f64::from_str_radix`.
9613 * [Reverse-searching strings is faster with the 'two-way'
9615 * [`std::io::copy` allows `?Sized` arguments][cc].
9616 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9617 [override `count`, `nth` and `last` with an *O*(1)
9618 implementation][it].
9619 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9620 * [`IntoRawFd` has been added to the Unix-specific prelude,
9621 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9623 * [`Extend<String>` and `FromIterator<String` are both implemented for
9625 * [`IntoIterator` is implemented for references to `Option` and
9627 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9628 Copy`][ext] as part of [RFC 839]. This will cause type inference
9629 breakage in rare situations.
9630 * [`BinaryHeap` implements `Debug`][bh2].
9631 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9633 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9634 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9635 * [String comparison is faster][faststr].
9636 * `&mut T` where `T: std::fmt::Write` [also implements
9637 `std::fmt::Write`][mutw].
9638 * [A stable regression in `VecDeque::push_back` and other
9639 capacity-altering methods that caused panics for zero-sized types
9641 * [Function pointers implement traits for up to 12 parameters][fp2].
9646 * The compiler [no longer uses the 'morestack' feature to prevent
9647 stack overflow][mm]. Instead it uses guard pages and stack
9648 probes (though stack probes are not yet implemented on any platform
9650 * [The compiler matches traits faster when projections are involved][p].
9651 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9653 * [Cargo now displays useful information about what its doing during
9654 `cargo update`][cu].
9656 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9657 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9658 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9659 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9660 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9661 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9662 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9663 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9664 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9665 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9666 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9667 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9668 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9669 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9670 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9671 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9672 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9673 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9674 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9675 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9676 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9677 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9678 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9679 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9680 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9681 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9682 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9683 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9684 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9685 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9686 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9687 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9688 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9689 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9690 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9691 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9692 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9693 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9694 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9695 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9696 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9697 [bh2]: https://github.com/rust-lang/rust/pull/28156
9698 [binfat]: https://github.com/rust-lang/rust/pull/28270
9699 [bm]: https://github.com/rust-lang/rust/pull/28197
9700 [cc]: https://github.com/rust-lang/rust/pull/27531
9701 [crlf]: https://github.com/rust-lang/rust/pull/28034
9702 [cu]: https://github.com/rust-lang/cargo/pull/1931
9703 [d]: https://github.com/rust-lang/rust/pull/27825
9704 [dep]: https://github.com/rust-lang/rust/pull/28339
9705 [es]: https://github.com/rust-lang/rust/pull/27956
9706 [ext]: https://github.com/rust-lang/rust/pull/28094
9707 [faststr]: https://github.com/rust-lang/rust/pull/28338
9708 [ffi]: https://github.com/rust-lang/rust/pull/28779
9709 [fp]: https://github.com/rust-lang/rust/pull/28268
9710 [fp2]: https://github.com/rust-lang/rust/pull/28560
9711 [fp3]: https://github.com/rust-lang/rust/pull/27307
9712 [i]: https://github.com/rust-lang/rust/pull/27451
9713 [into2]: https://github.com/rust-lang/rust/pull/28039
9714 [it]: https://github.com/rust-lang/rust/pull/27652
9715 [mm]: https://github.com/rust-lang/rust/pull/27338
9716 [mutw]: https://github.com/rust-lang/rust/pull/28368
9717 [sound]: https://github.com/rust-lang/rust/pull/27641
9718 [p]: https://github.com/rust-lang/rust/pull/27866
9719 [pec]: https://github.com/rust-lang/rust/pull/28486
9720 [pr]: https://github.com/rust-lang/rust/pull/27896
9721 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9722 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9723 [s]: https://github.com/rust-lang/rust/pull/27474
9724 [stab]: https://github.com/rust-lang/rust/pull/28339
9725 [stat]: https://github.com/rust-lang/rust/pull/28321
9726 [vd]: https://github.com/rust-lang/rust/pull/28494
9728 Version 1.3.0 (2015-09-17)
9729 ==============================
9731 * ~900 changes, numerous bugfixes
9736 * The [new object lifetime defaults][nold] have been [turned
9737 on][nold2] after a cycle of warnings about the change. Now types
9738 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9739 being interpreted as `&'a Box<Trait+'a>` to `&'a
9740 Box<Trait+'static>`.
9741 * [The Rustonomicon][nom] is a new book in the official documentation
9742 that dives into writing unsafe Rust.
9743 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9744 timekeeping is employed by other std APIs, as well as out-of-tree
9750 * The [new object lifetime defaults][nold] have been [turned
9751 on][nold2] after a cycle of warnings about the change.
9752 * There is a known [regression][lr] in how object lifetime elision is
9753 interpreted, the proper solution for which is undetermined.
9754 * The `#[prelude_import]` attribute, an internal implementation
9755 detail, was accidentally stabilized previously. [It has been put
9756 behind the `prelude_import` feature gate][pi]. This change is
9757 believed to break no existing code.
9758 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9759 [more sane for dynamically sized types][dst3]. Code that relied on
9760 the previous behavior is thought to be broken.
9761 * The `dropck` rules, which checks that destructors can't access
9762 destroyed values, [have been updated][dropck] to match the
9763 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9764 cause some previously-compiling code to no longer build.
9769 * The [new object lifetime defaults][nold] have been [turned
9770 on][nold2] after a cycle of warnings about the change.
9771 * Semicolons may [now follow types and paths in
9772 macros](https://github.com/rust-lang/rust/pull/27000).
9773 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9774 [more sane for dynamically sized types][dst3]. Code that relied on
9775 the previous behavior is not known to exist, and suspected to be
9777 * `'static` variables [may now be recursive][st].
9778 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9779 implementations correctly.
9780 * The `dropck` rules, which checks that destructors can't access
9781 destroyed values, [have been updated][dropck] to match the
9787 * The [`Duration`] API, [has been stabilized][ds], as well as the
9788 `std::time` module, which presently contains only `Duration`.
9789 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9790 * The owned C string, [`CString`], implements [`Borrow`] and the
9791 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9792 these allow C strings to be borrowed and cloned in generic code.
9793 * [`CStr`] implements [`Debug`].
9794 * [`AtomicPtr`] implements [`Debug`].
9795 * [`Error`] trait objects [can be downcast to their concrete types][e]
9796 in many common configurations, using the [`is`], [`downcast`],
9797 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9799 * Searching for substrings now [employs the two-way algorithm][search]
9800 instead of doing a naive search. This gives major speedups to a
9801 number of methods, including [`contains`][sc], [`find`][sf],
9802 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9803 [`ends_with`][sew] are also faster.
9804 * The performance of `PartialEq` for slices is [much faster][ps].
9805 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9806 is overridden and optimized by the implementations for scalars.
9807 * The [`Hasher`] trait now has a number of specialized `write_*`
9808 methods for primitive types, for efficiency.
9809 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9810 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9811 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9812 of [`std::error::Error::cause`][iec] also delegates to the inner
9814 * [`process::Child`][pc] gained the [`id`] method, which returns a
9815 `u32` representing the platform-specific process identifier.
9816 * The [`connect`] method on slices is deprecated, replaced by the new
9817 [`join`] method (note that both of these are on the *unstable*
9818 [`SliceConcatExt`] trait, but through the magic of the prelude are
9819 available to stable code anyway).
9820 * The [`Div`] operator is implemented for [`Wrapping`] types.
9821 * [`DerefMut` is implemented for `String`][dms].
9822 * Performance of SipHash (the default hasher for `HashMap`) is
9823 [better for long data][sh].
9824 * [`AtomicPtr`] implements [`Send`].
9825 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9826 are now [specialized to use uninitialized buffers for increased
9828 * Lifetime parameters of foreign functions [are now resolved
9834 * Rust can now, with some coercion, [produce programs that run on
9835 Windows XP][xp], though XP is not considered a supported platform.
9836 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9837 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9838 recommended for use in 1.3, though should be fully-functional
9839 in the [64-bit 1.4 beta][b14].
9840 * On Fedora-based systems installation will [properly configure the
9841 dynamic linker][fl].
9842 * The compiler gained many new extended error descriptions, which can
9843 be accessed with the `--explain` flag.
9844 * The `dropck` pass, which checks that destructors can't access
9845 destroyed values, [has been rewritten][27261]. This fixes some
9846 soundness holes, and as such will cause some previously-compiling
9847 code to no longer build.
9848 * `rustc` now uses [LLVM to write archive files where possible][ar].
9849 Eventually this will eliminate the compiler's dependency on the ar
9851 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9852 supported FreeBSD on x86_64).
9853 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9854 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9856 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9857 will kill the process instead of leaking][nlp].
9859 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9860 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9861 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9862 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9863 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9864 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9865 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9866 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9867 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9868 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9869 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9870 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9871 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9872 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9873 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9874 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9875 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9876 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9877 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9878 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9879 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9880 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9881 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9882 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9883 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9884 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9885 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9886 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9887 [ar]: https://github.com/rust-lang/rust/pull/26926
9888 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9889 [dms]: https://github.com/rust-lang/rust/pull/26241
9890 [27261]: https://github.com/rust-lang/rust/pull/27261
9891 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9892 [ds]: https://github.com/rust-lang/rust/pull/26818
9893 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9894 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9895 [dst3]: https://github.com/rust-lang/rust/pull/27351
9896 [e]: https://github.com/rust-lang/rust/pull/24793
9897 [f]: https://github.com/rust-lang/rust/pull/26588
9898 [26959]: https://github.com/rust-lang/rust/pull/26959
9899 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9900 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9901 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9902 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9903 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9904 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9905 [lic]: https://github.com/rust-lang/rust/pull/26583
9906 [lnu]: https://github.com/rust-lang/rust/pull/27026
9907 [lr]: https://github.com/rust-lang/rust/issues/27248
9908 [lum]: https://github.com/rust-lang/rust/pull/26378
9909 [lur]: https://github.com/rust-lang/rust/pull/26783
9910 [nlp]: https://github.com/rust-lang/rust/pull/27176
9911 [nold2]: https://github.com/rust-lang/rust/pull/27045
9912 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9913 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9914 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9915 [pi]: https://github.com/rust-lang/rust/pull/26699
9916 [ps]: https://github.com/rust-lang/rust/pull/26884
9917 [rte]: https://github.com/rust-lang/rust/pull/26950
9918 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9919 [search]: https://github.com/rust-lang/rust/pull/26327
9920 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9921 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9922 [sh]: https://github.com/rust-lang/rust/pull/27280
9923 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9924 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9925 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9926 [st]: https://github.com/rust-lang/rust/pull/26630
9927 [win1]: https://github.com/rust-lang/rust/pull/26569
9928 [win2]: https://github.com/rust-lang/rust/pull/26741
9929 [win3]: https://github.com/rust-lang/rust/pull/26741
9930 [win4]: https://github.com/rust-lang/rust/pull/27210
9931 [xp]: https://github.com/rust-lang/rust/pull/26569
9933 Version 1.2.0 (2015-08-07)
9934 ==========================
9936 * ~1200 changes, numerous bugfixes
9941 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9942 like `Rc` to contain types without a fixed size, arrays and trait
9943 objects, finally enabling use of `Rc<[T]>` and completing the
9944 implementation of DST.
9945 * [Parallel codegen][parcodegen] is now working again, which can
9946 substantially speed up large builds in debug mode; It also gets
9947 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9948 jobs). It's not enabled by default, but will be "in the near
9949 future". It can be activated with the `-C codegen-units=N` flag to
9951 * This is the first release with [experimental support for linking
9952 with the MSVC linker and lib C on Windows (instead of using the GNU
9953 variants via MinGW)][win]. It is yet recommended only for the most
9954 intrepid Rustaceans.
9955 * Benchmark compilations are showing a 30% improvement in
9956 bootstrapping over 1.1.
9961 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9962 unicode case mapping, which is a previously-planned change in
9963 behavior and considered a bugfix.
9964 * [`mem::align_of`] now specifies [the *minimum alignment* for
9965 T][align], which is usually the alignment programs are interested
9966 in, and the same value reported by clang's
9967 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9969 * [The `#[packed]` attribute is no longer silently accepted by the
9970 compiler][packed]. This attribute did nothing and code that
9971 mentioned it likely did not work as intended.
9972 * Associated type defaults are [now behind the
9973 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9974 defaults *did not work*, but could be mentioned syntactically. As
9975 such this breakage has minimal impact.
9980 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9981 matching against dereferenceable values.
9986 * The [`Extend`] trait, which grows a collection from an iterator, is
9987 implemented over iterators of references, for `String`, `Vec`,
9988 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9989 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9990 * The [`iter::once`] function returns an iterator that yields a single
9991 element, and [`iter::empty`] returns an iterator that yields no
9993 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9994 over substring matches.
9995 * [`Cell`] and [`RefCell`] both implement `Eq`.
9996 * A number of methods for wrapping arithmetic are added to the
9997 integral types, [`wrapping_div`], [`wrapping_rem`],
9998 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9999 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10000 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10001 type.. It is illegal for the default arithmetic operations in Rust
10002 to overflow; the desire to wrap must be explicit.
10003 * The `{:#?}` formatting specifier [displays the alternate,
10004 pretty-printed][debugfmt] form of the `Debug` formatter. This
10005 feature was actually introduced prior to 1.0 with little
10007 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10008 for writing data to formatted strings, similar to [`io::Write`].
10009 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10010 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10011 are used by code generators to emit implementations of [`Debug`].
10012 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10013 methods that convert case, following Unicode case mapping.
10014 * It is now easier to handle poisoned locks. The [`PoisonError`]
10015 type, returned by failing lock operations, exposes `into_inner`,
10016 `get_ref`, and `get_mut`, which all give access to the inner lock
10017 guard, and allow the poisoned lock to continue to operate. The
10018 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10019 poisoned lock without attempting to take the lock.
10020 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10021 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10022 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10023 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10025 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10031 * `rustc` employs smarter heuristics for guessing at [typos].
10032 * `rustc` emits more efficient code for [no-op conversions between
10033 unsafe pointers][nop].
10034 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10035 resulting in faster compile times and smaller code.
10037 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10038 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10039 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10040 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10041 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10042 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10043 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10044 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10045 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10046 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10047 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10048 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10049 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10050 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10051 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10052 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10053 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10054 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10055 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10056 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10057 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10058 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10059 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10060 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10061 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10062 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10063 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10064 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10065 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10066 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10067 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10068 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10069 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10070 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10071 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10072 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10073 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10074 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10075 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10076 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10077 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10078 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10079 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10080 [align]: https://github.com/rust-lang/rust/pull/25646
10081 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10082 [typos]: https://github.com/rust-lang/rust/pull/26087
10083 [nop]: https://github.com/rust-lang/rust/pull/26336
10084 [fat]: https://github.com/rust-lang/rust/pull/26411
10085 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10086 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10087 [packed]: https://github.com/rust-lang/rust/pull/25541
10088 [ad]: https://github.com/rust-lang/rust/pull/27382
10089 [win]: https://github.com/rust-lang/rust/pull/25350
10091 Version 1.1.0 (2015-06-25)
10092 =========================
10094 * ~850 changes, numerous bugfixes
10099 * The [`std::fs` module has been expanded][fs] to expand the set of
10100 functionality exposed:
10101 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10102 don't incur a syscall on some platforms.
10103 * A `symlink_metadata` function has been added.
10104 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10105 access to all underlying information.
10106 * The compiler now contains extended explanations of many errors. When an error
10107 with an explanation occurs the compiler suggests using the `--explain` flag
10108 to read the explanation. Error explanations are also [available online][err-index].
10109 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10110 well as other work, the time to bootstrap the compiler decreased by
10116 * The [`str::split_whitespace`] method splits a string on unicode
10117 whitespace boundaries.
10118 * On both Windows and Unix, new extension traits provide conversion of
10119 I/O types to and from the underlying system handles. On Unix, these
10120 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10121 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10122 `TcpListener`, and `UpdSocket`. Further implementations for
10123 `std::process` will be stabilized later.
10124 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10125 Windows, symlinks can be created with
10126 `std::os::windows::symlink_dir` and
10127 `std::os::windows::symlink_file`.
10128 * The `mpsc::Receiver` type can now be converted into an iterator with
10129 `into_iter` on the [`IntoIterator`] trait.
10130 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10131 implementation of the [`From`] trait.
10132 * The `Debug` implementation for `RangeFull` [creates output that is
10133 more consistent with other implementations][rf].
10134 * [`Debug` is implemented for `File`][file].
10135 * The `Default` implementation for `Arc` [no longer requires `Sync +
10137 * [The `Iterator` methods `count`, `nth`, and `last` have been
10138 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10139 * Incorrect handling of paths on Windows has been improved in both the
10140 compiler and the standard library.
10141 * [`AtomicPtr` gained a `Default` implementation][ap].
10142 * In accordance with Rust's policy on arithmetic overflow `abs` now
10143 [panics on overflow when debug assertions are enabled][abs].
10144 * The [`Cloned`] iterator, which was accidentally left unstable for
10145 1.0 [has been stabilized][c].
10146 * The [`Incoming`] iterator, which iterates over incoming TCP
10147 connections, and which was accidentally unnamable in 1.0, [is now
10148 properly exported][inc].
10149 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10150 `sift_up` or `sift_down` panic][bh].
10151 * The [`split_off`] method of `LinkedList` [no longer corrupts
10152 the list in certain scenarios][ll].
10157 * Type checking performance [has improved notably][sk] with
10158 [multiple improvements][pre].
10159 * The compiler [suggests code changes][ch] for more errors.
10160 * rustc and it's build system have experimental support for [building
10161 toolchains against MUSL][m] instead of glibc on Linux.
10162 * The compiler defines the `target_env` cfg value, which is used for
10163 distinguishing toolchains that are otherwise for the same
10164 platform. Presently this is set to `gnu` for common GNU Linux
10165 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10166 * The [`cargo rustc`][crc] command invokes a build with custom flags
10168 * [Android executables are always position independent][pie].
10169 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10170 with `Drop`][24935].
10172 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10173 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10174 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10175 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10176 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10177 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10178 [rf]: https://github.com/rust-lang/rust/pull/24491
10179 [err-index]: https://doc.rust-lang.org/error-index.html
10180 [sk]: https://github.com/rust-lang/rust/pull/24615
10181 [pre]: https://github.com/rust-lang/rust/pull/25323
10182 [file]: https://github.com/rust-lang/rust/pull/24598
10183 [ch]: https://github.com/rust-lang/rust/pull/24683
10184 [arc]: https://github.com/rust-lang/rust/pull/24695
10185 [si]: https://github.com/rust-lang/rust/pull/24701
10186 [ap]: https://github.com/rust-lang/rust/pull/24834
10187 [m]: https://github.com/rust-lang/rust/pull/24777
10188 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10189 [crc]: https://github.com/rust-lang/cargo/pull/1568
10190 [pie]: https://github.com/rust-lang/rust/pull/24953
10191 [abs]: https://github.com/rust-lang/rust/pull/25441
10192 [c]: https://github.com/rust-lang/rust/pull/25496
10193 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10194 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10195 [inc]: https://github.com/rust-lang/rust/pull/25522
10196 [bh]: https://github.com/rust-lang/rust/pull/25856
10197 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10198 [ll]: https://github.com/rust-lang/rust/pull/26022
10199 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10200 [24935]: https://github.com/rust-lang/rust/pull/24935
10202 Version 1.0.0 (2015-05-15)
10203 ========================
10205 * ~1500 changes, numerous bugfixes
10210 * The vast majority of the standard library is now `#[stable]`. It is
10211 no longer possible to use unstable features with a stable build of
10213 * Many popular crates on [crates.io] now work on the stable release
10215 * Arithmetic on basic integer types now [checks for overflow in debug
10221 * Several [restrictions have been added to trait coherence][coh] in
10222 order to make it easier for upstream authors to change traits
10223 without breaking downstream code.
10224 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10225 improve error messages and macro behavior. For example, `0b1234` is
10226 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10227 * Trait bounds [are always invariant][inv], eliminating the need for
10228 the `PhantomFn` and `MarkerTrait` lang items, which have been
10230 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10231 "foo" as bar` syntax has been replaced with `extern crate foo as
10232 bar`, and Cargo now automatically translates "-" in *package* names
10233 to underscore for the crate name.
10234 * [Lifetime shadowing is an error][lt].
10235 * [`Send` no longer implies `'static`][send-rfc].
10236 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10237 `MyType::default()`.
10238 * Primitive types [now have inherent methods][prim-inherent],
10239 obviating the need for extension traits like `SliceExt`.
10240 * Methods with `Self: Sized` in their `where` clause are [considered
10241 object-safe][self-sized], allowing many extension traits like
10242 `IteratorExt` to be merged into the traits they extended.
10243 * You can now [refer to associated types][assoc-where] whose
10244 corresponding trait bounds appear only in a `where` clause.
10245 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10246 like `Send` and `Sync` are now library-defined.
10247 * A [Reflect trait][reflect] was introduced, which means that
10248 downcasting via the `Any` trait is effectively limited to concrete
10249 types. This helps retain the potentially-important "parametricity"
10250 property: generic code cannot behave differently for different type
10251 arguments except in minor ways.
10252 * The `unsafe_destructor` feature is now deprecated in favor of the
10253 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10259 * The `thread_local` module [has been renamed to `std::thread`][th].
10260 * The methods of `IteratorExt` [have been moved to the `Iterator`
10261 trait itself][23300].
10262 * Several traits that implement Rust's conventions for type
10263 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10264 [centralized in the `std::convert` module][con].
10265 * The `FromError` trait [was removed in favor of `From`][fe].
10266 * The basic sleep function [has moved to
10267 `std::thread::sleep_ms`][slp].
10268 * The `splitn` function now takes an `n` parameter that represents the
10269 number of items yielded by the returned iterator [instead of the
10270 number of 'splits'][spl].
10271 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10272 * [Derived implementations of `PartialOrd` now order enums according
10273 to their explicitly-assigned discriminants][po].
10274 * [Methods for searching strings are generic over `Pattern`s][pat],
10275 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10277 * [In method resolution, object methods are resolved before inherent
10279 * [`String::from_str` has been deprecated in favor of the `From` impl,
10280 `String::from`][24517].
10281 * [`io::Error` implements `Sync`][ios].
10282 * [The `words` method on `&str` has been replaced with
10283 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10285 * The new path and IO modules are complete and `#[stable]`. This
10286 was the major library focus for this cycle.
10287 * The path API was [revised][path-normalize] to normalize `.`,
10288 adjusting the tradeoffs in favor of the most common usage.
10289 * A large number of remaining APIs in `std` were also stabilized
10290 during this cycle; about 75% of the non-deprecated API surface
10292 * The new [string pattern API][string-pattern] landed, which makes
10293 the string slice API much more internally consistent and flexible.
10294 * A new set of [generic conversion traits][conversion] replaced
10295 many existing ad hoc traits.
10296 * Generic numeric traits were [completely removed][num-traits]. This
10297 was made possible thanks to inherent methods for primitive types,
10298 and the removal gives maximal flexibility for designing a numeric
10299 hierarchy in the future.
10300 * The `Fn` traits are now related via [inheritance][fn-inherit]
10301 and provide ergonomic [blanket implementations][fn-blanket].
10302 * The `Index` and `IndexMut` traits were changed to
10303 [take the index by value][index-value], enabling code like
10304 `hash_map["string"]` to work.
10305 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10306 `Copy` data is known to be `Clone` as well.
10311 * Many errors now have extended explanations that can be accessed with
10312 the `--explain` flag to `rustc`.
10313 * Many new examples have been added to the standard library
10315 * rustdoc has received a number of improvements focused on completion
10317 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10318 * Much headway was made on ecosystem-wide CI, making it possible
10319 to [compare builds for breakage][ci-compare].
10322 [crates.io]: http://crates.io
10323 [clo]: https://github.com/rust-lang/rust/pull/24034
10324 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10325 [con]: https://github.com/rust-lang/rust/pull/23875
10326 [cr]: https://github.com/rust-lang/rust/pull/23419
10327 [fe]: https://github.com/rust-lang/rust/pull/23879
10328 [23300]: https://github.com/rust-lang/rust/pull/23300
10329 [inv]: https://github.com/rust-lang/rust/pull/23938
10330 [ios]: https://github.com/rust-lang/rust/pull/24133
10331 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10332 [lt]: https://github.com/rust-lang/rust/pull/24057
10333 [meth]: https://github.com/rust-lang/rust/pull/24056
10334 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10335 [po]: https://github.com/rust-lang/rust/pull/24270
10336 [24517]: https://github.com/rust-lang/rust/pull/24517
10337 [slp]: https://github.com/rust-lang/rust/pull/23949
10338 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10339 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10340 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10341 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10342 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10343 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10344 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10345 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10346 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10347 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10348 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10349 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10350 [reflect]: https://github.com/rust-lang/rust/pull/23712
10351 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10352 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10353 [index-value]: https://github.com/rust-lang/rust/pull/23601
10354 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10355 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10356 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10357 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10358 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10359 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10362 Version 1.0.0-alpha.2 (2015-02-20)
10363 =====================================
10365 * ~1300 changes, numerous bugfixes
10369 * The various I/O modules were [overhauled][io-rfc] to reduce
10370 unnecessary abstractions and provide better interoperation with
10371 the underlying platform. The old `io` module remains temporarily
10373 * The standard library now [participates in feature gating][feat],
10374 so use of unstable libraries now requires a `#![feature(...)]`
10375 attribute. The impact of this change is [described on the
10376 forum][feat-forum]. [RFC][feat-rfc].
10380 * `for` loops [now operate on the `IntoIterator` trait][into],
10381 which eliminates the need to call `.iter()`, etc. to iterate
10382 over collections. There are some new subtleties to remember
10383 though regarding what sort of iterators various types yield, in
10384 particular that `for foo in bar { }` yields values from a move
10385 iterator, destroying the original collection. [RFC][into-rfc].
10386 * Objects now have [default lifetime bounds][obj], so you don't
10387 have to write `Box<Trait+'static>` when you don't care about
10388 storing references. [RFC][obj-rfc].
10389 * In types that implement `Drop`, [lifetimes must outlive the
10390 value][drop]. This will soon make it possible to safely
10391 implement `Drop` for types where `#[unsafe_destructor]` is now
10392 required. Read the [gorgeous RFC][drop-rfc] for details.
10393 * The fully qualified <T as Trait>::X syntax lets you set the Self
10394 type for a trait method or associated type. [RFC][ufcs-rfc].
10395 * References to types that implement `Deref<U>` now [automatically
10396 coerce to references][deref] to the dereferenced type `U`,
10397 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10398 should eliminate many unsightly uses of `&*`, as when converting
10399 from references to vectors into references to
10400 slices. [RFC][deref-rfc].
10401 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10402 `|:|`) is obsolete and closure kind is inferred from context.
10403 * [`Self` is a keyword][Self].
10407 * The `Show` and `String` formatting traits [have been
10408 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10409 their related purposes. Automatically getting a string
10410 conversion to use with `format!("{:?}", something_to_debug)` is
10411 now written `#[derive(Debug)]`.
10412 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10413 OsStr}`, provide strings in platform-specific encodings for easier
10414 interop with system APIs. [RFC][osstr-rfc].
10415 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10416 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10417 creating raw pointers.
10421 * Certain long error messages of the form 'expected foo found bar'
10422 are now [split neatly across multiple
10423 lines][multiline]. Examples in the PR.
10424 * On Unix Rust can be [uninstalled][un] by running
10425 `/usr/local/lib/rustlib/uninstall.sh`.
10426 * The `#[rustc_on_unimplemented]` attribute, requiring the
10427 'on_unimplemented' feature, lets rustc [display custom error
10428 messages when a trait is expected to be implemented for a type
10433 * Rust is tested against a [LALR grammar][lalr], which parses
10434 almost all the Rust files that rustc does.
10436 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10437 [close]: https://github.com/rust-lang/rust/pull/21843
10438 [deref]: https://github.com/rust-lang/rust/pull/21351
10439 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10440 [drop]: https://github.com/rust-lang/rust/pull/21972
10441 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10442 [feat]: https://github.com/rust-lang/rust/pull/21248
10443 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10444 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10445 [fmt]: https://github.com/rust-lang/rust/pull/21457
10446 [into]: https://github.com/rust-lang/rust/pull/20790
10447 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10448 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10449 [lalr]: https://github.com/rust-lang/rust/pull/21452
10450 [multiline]: https://github.com/rust-lang/rust/pull/19870
10451 [obj]: https://github.com/rust-lang/rust/pull/22230
10452 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10453 [onun]: https://github.com/rust-lang/rust/pull/20889
10454 [osstr]: https://github.com/rust-lang/rust/pull/21488
10455 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10456 [Self]: https://github.com/rust-lang/rust/pull/22158
10457 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10458 [un]: https://github.com/rust-lang/rust/pull/22256
10461 Version 1.0.0-alpha (2015-01-09)
10462 ==================================
10464 * ~2400 changes, numerous bugfixes
10468 * The language itself is considered feature complete for 1.0,
10469 though there will be many usability improvements and bugfixes
10470 before the final release.
10471 * Nearly 50% of the public API surface of the standard library has
10472 been declared 'stable'. Those interfaces are unlikely to change
10474 * The long-running debate over integer types has been
10475 [settled][ints]: Rust will ship with types named `isize` and
10476 `usize`, rather than `int` and `uint`, for pointer-sized
10477 integers. Guidelines will be rolled out during the alpha cycle.
10478 * Most crates that are not `std` have been moved out of the Rust
10479 distribution into the Cargo ecosystem so they can evolve
10480 separately and don't need to be stabilized as quickly, including
10481 'time', 'getopts', 'num', 'regex', and 'term'.
10482 * Documentation continues to be expanded with more API coverage, more
10483 examples, and more in-depth explanations. The guides have been
10484 consolidated into [The Rust Programming Language][trpl].
10485 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10486 * All official Rust binary installers now come with [Cargo], the
10487 Rust package manager.
10491 * Closures have been [completely redesigned][unboxed] to be
10492 implemented in terms of traits, can now be used as generic type
10493 bounds and thus monomorphized and inlined, or via an opaque
10494 pointer (boxed) as in the old system. The new system is often
10495 referred to as 'unboxed' closures.
10496 * Traits now support [associated types][assoc], allowing families
10497 of related types to be defined together and used generically in
10499 * Enum variants are [namespaced by their type names][enum].
10500 * [`where` clauses][where] provide a more versatile and attractive
10501 syntax for specifying generic bounds, though the previous syntax
10503 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10505 * Rust [no longer has a runtime][rt] of any description, and only
10506 supports OS threads, not green threads.
10507 * At long last, Rust has been overhauled for 'dynamically-sized
10508 types' ([DST]), which integrates 'fat pointers' (object types,
10509 arrays, and `str`) more deeply into the type system, making it
10511 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10512 `..j` that produce range types and which, when combined with the
10513 `Index` operator and multidispatch, leads to a convenient slice
10514 notation, `[i..j]`.
10515 * The new range syntax revealed an ambiguity in the fixed-length
10516 array syntax, so now fixed length arrays [are written `[T;
10518 * The `Copy` trait is no longer implemented automatically. Unsafe
10519 pointers no longer implement `Sync` and `Send` so types
10520 containing them don't automatically either. `Sync` and `Send`
10521 are now 'unsafe traits' so one can "forcibly" implement them via
10522 `unsafe impl` if a type confirms to the requirements for them
10523 even though the internals do not (e.g. structs containing unsafe
10524 pointers like `Arc`). These changes are intended to prevent some
10525 footguns and are collectively known as [opt-in built-in
10526 traits][oibit] (though `Sync` and `Send` will soon become pure
10527 library types unknown to the compiler).
10528 * Operator traits now take their operands [by value][ops], and
10529 comparison traits can use multidispatch to compare one type
10530 against multiple other types, allowing e.g. `String` to be
10531 compared with `&str`.
10532 * `if let` and `while let` are no longer feature-gated.
10533 * Rust has adopted a more [uniform syntax for escaping unicode
10534 characters][unicode].
10535 * `macro_rules!` [has been declared stable][mac]. Though it is a
10536 flawed system it is sufficiently popular that it must be usable
10537 for 1.0. Effort has gone into [future-proofing][mac-future] it
10538 in ways that will allow other macro systems to be developed in
10539 parallel, and won't otherwise impact the evolution of the
10541 * The prelude has been [pared back significantly][prelude] such
10542 that it is the minimum necessary to support the most pervasive
10543 code patterns, and through [generalized where clauses][where]
10544 many of the prelude extension traits have been consolidated.
10545 * Rust's rudimentary reflection [has been removed][refl], as it
10546 incurred too much code generation for little benefit.
10547 * [Struct variants][structvars] are no longer feature-gated.
10548 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10549 known as 'higher-ranked trait bounds', this crucially allows
10550 unboxed closures to work.
10551 * Macros invocations surrounded by parens or square brackets and
10552 not terminated by a semicolon are [parsed as
10553 expressions][macros], which makes expressions like `vec![1i32,
10554 2, 3].len()` work as expected.
10555 * Trait objects now implement their traits automatically, and
10556 traits that can be coerced to objects now must be [object
10558 * Automatically deriving traits is now done with `#[derive(...)]`
10559 not `#[deriving(...)]` for [consistency with other naming
10560 conventions][derive].
10561 * Importing the containing module or enum at the same time as
10562 items or variants they contain is [now done with `self` instead
10563 of `mod`][self], as in use `foo::{self, bar}`
10564 * Glob imports are no longer feature-gated.
10565 * The `box` operator and `box` patterns have been feature-gated
10566 pending a redesign. For now unique boxes should be allocated
10567 like other containers, with `Box::new`.
10571 * A [series][coll1] of [efforts][coll2] to establish
10572 [conventions][coll3] for collections types has resulted in API
10573 improvements throughout the standard library.
10574 * New [APIs for error handling][err] provide ergonomic interop
10575 between error types, and [new conventions][err-conv] describe
10576 more clearly the recommended error handling strategies in Rust.
10577 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10578 it is easier to discuss failure in the context of error handling
10579 without making clarifications as to whether you are referring to
10580 the 'fail' macro or failure more generally.
10581 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10582 syscall when available.
10583 * The 'serialize' crate has been renamed 'rustc-serialize' and
10584 moved out of the distribution to Cargo. Although it is widely
10585 used now, it is expected to be superseded in the near future.
10586 * The `Show` formatter, typically implemented with
10587 `#[derive(Show)]` is [now requested with the `{:?}`
10588 specifier][show] and is intended for use by all types, for uses
10589 such as `println!` debugging. The new `String` formatter must be
10590 implemented by hand, uses the `{}` specifier, and is intended
10591 for full-fidelity conversions of things that can logically be
10592 represented as strings.
10596 * [Flexible target specification][flex] allows rustc's code
10597 generation to be configured to support otherwise-unsupported
10599 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10600 respective debuggers with Rust-appropriate pretty-printing.
10601 * The Windows installation of Rust is distributed with the
10602 MinGW components currently required to link binaries on that
10607 * Nullable enum optimizations have been extended to more types so
10608 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10609 space than the inner types themselves.
10610 * Work has begun on supporting AArch64.
10612 [Cargo]: https://crates.io
10613 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10614 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10615 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10616 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10617 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10618 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10619 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10620 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10621 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10622 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10623 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10624 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10625 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10626 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10627 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10628 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10629 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10630 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10631 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10632 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10633 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10634 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10635 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10636 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10637 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10638 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10639 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10640 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10641 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10642 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10643 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10644 [trpl]: https://doc.rust-lang.org/book/index.html
10645 [rbe]: http://rustbyexample.com/
10648 Version 0.12.0 (2014-10-09)
10649 =============================
10651 * ~1900 changes, numerous bugfixes
10655 * The introductory documentation (now called The Rust Guide) has
10656 been completely rewritten, as have a number of supplementary
10658 * Rust's package manager, Cargo, continues to improve and is
10659 sometimes considered to be quite awesome.
10660 * Many API's in `std` have been reviewed and updated for
10661 consistency with the in-development Rust coding
10662 guidelines. The standard library documentation tracks
10663 stabilization progress.
10664 * Minor libraries have been moved out-of-tree to the rust-lang org
10665 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10666 be installed with Cargo.
10667 * Lifetime elision allows lifetime annotations to be left off of
10668 function declarations in many common scenarios.
10669 * Rust now works on 64-bit Windows.
10672 * Indexing can be overloaded with the `Index` and `IndexMut`
10674 * The `if let` construct takes a branch only if the `let` pattern
10675 matches, currently behind the 'if_let' feature gate.
10676 * 'where clauses', a more flexible syntax for specifying trait
10677 bounds that is more aesthetic, have been added for traits and
10678 free functions. Where clauses will in the future make it
10679 possible to constrain associated types, which would be
10680 impossible with the existing syntax.
10681 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10682 the 'slicing_syntax' feature gate, and can be overloaded with
10683 the `Slice` or `SliceMut` traits.
10684 * The syntax for matching of sub-slices has been changed to use a
10685 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10686 consistency with other uses of `..` and to future-proof
10687 potential additional uses of the syntax.
10688 * The syntax for matching inclusive ranges in patterns has changed
10689 from `0..3` to `0...4` to be consistent with the exclusive range
10690 syntax for slicing.
10691 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10692 c]`) has been put behind the 'advanced_slice_patterns' feature
10693 gate and may be removed in the future.
10694 * Components of tuples and tuple structs can be extracted using
10695 the `value.0` syntax, currently behind the `tuple_indexing`
10697 * The `#[crate_id]` attribute is no longer supported; versioning
10698 is handled by the package manager.
10699 * Renaming crate imports are now written `extern crate foo as bar`
10700 instead of `extern crate bar = foo`.
10701 * Renaming use statements are now written `use foo as bar` instead
10702 of `use bar = foo`.
10703 * `let` and `match` bindings and argument names in macros are now
10705 * The new, more efficient, closure types ('unboxed closures') have
10706 been added under a feature gate, 'unboxed_closures'. These will
10707 soon replace the existing closure types, once higher-ranked
10708 trait lifetimes are added to the language.
10709 * `move` has been added as a keyword, for indicating closures
10710 that capture by value.
10711 * Mutation and assignment is no longer allowed in pattern guards.
10712 * Generic structs and enums can now have trait bounds.
10713 * The `Share` trait is now called `Sync` to free up the term
10714 'shared' to refer to 'shared reference' (the default reference
10716 * Dynamically-sized types have been mostly implemented,
10717 unifying the behavior of fat-pointer types with the rest of the
10719 * As part of dynamically-sized types, the `Sized` trait has been
10720 introduced, which qualifying types implement by default, and
10721 which type parameters expect by default. To specify that a type
10722 parameter does not need to be sized, write `<Sized? T>`. Most
10723 types are `Sized`, notable exceptions being unsized arrays
10724 (`[T]`) and trait types.
10725 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10726 * Lifetime bounds can now be applied to type parameters and object
10728 * The old, reference counted GC type, `Gc<T>` which was once
10729 denoted by the `@` sigil, has finally been removed. GC will be
10730 revisited in the future.
10733 * Library documentation has been improved for a number of modules.
10734 * Bit-vectors, collections::bitv has been modernized.
10735 * The url crate is deprecated in favor of
10736 http://github.com/servo/rust-url, which can be installed with
10738 * Most I/O stream types can be cloned and subsequently closed from
10739 a different thread.
10740 * A `std::time::Duration` type has been added for use in I/O
10741 methods that rely on timers, as well as in the 'time' crate's
10742 `Timespec` arithmetic.
10743 * The runtime I/O abstraction layer that enabled the green thread
10744 scheduler to do non-thread-blocking I/O has been removed, along
10745 with the libuv-based implementation employed by the green thread
10746 scheduler. This will greatly simplify the future I/O work.
10747 * `collections::btree` has been rewritten to have a more
10748 idiomatic and efficient design.
10751 * rustdoc output now indicates the stability levels of API's.
10752 * The `--crate-name` flag can specify the name of the crate
10753 being compiled, like `#[crate_name]`.
10754 * The `-C metadata` specifies additional metadata to hash into
10755 symbol names, and `-C extra-filename` specifies additional
10756 information to put into the output filename, for use by the
10757 package manager for versioning.
10758 * debug info generation has continued to improve and should be
10759 more reliable under both gdb and lldb.
10760 * rustc has experimental support for compiling in parallel
10761 using the `-C codegen-units` flag.
10762 * rustc no longer encodes rpath information into binaries by
10766 * Stack usage has been optimized with LLVM lifetime annotations.
10767 * Official Rust binaries on Linux are more compatible with older
10768 kernels and distributions, built on CentOS 5.10.
10771 Version 0.11.0 (2014-07-02)
10772 ==========================
10774 * ~1700 changes, numerous bugfixes
10777 * ~[T] has been removed from the language. This type is superseded by
10779 * ~str has been removed from the language. This type is superseded by
10781 * ~T has been removed from the language. This type is superseded by the
10783 * @T has been removed from the language. This type is superseded by the
10784 standard library's std::gc::Gc<T> type.
10785 * Struct fields are now all private by default.
10786 * Vector indices and shift amounts are both required to be a `uint`
10787 instead of any integral type.
10788 * Byte character, byte string, and raw byte string literals are now all
10789 supported by prefixing the normal literal with a `b`.
10790 * Multiple ABIs are no longer allowed in an ABI string
10791 * The syntax for lifetimes on closures/procedures has been tweaked
10792 slightly: `<'a>|A, B|: 'b + K -> T`
10793 * Floating point modulus has been removed from the language; however it
10794 is still provided by a library implementation.
10795 * Private enum variants are now disallowed.
10796 * The `priv` keyword has been removed from the language.
10797 * A closure can no longer be invoked through a &-pointer.
10798 * The `use foo, bar, baz;` syntax has been removed from the language.
10799 * The transmute intrinsic no longer works on type parameters.
10800 * Statics now allow blocks/items in their definition.
10801 * Trait bounds are separated from objects with + instead of : now.
10802 * Objects can no longer be read while they are mutably borrowed.
10803 * The address of a static is now marked as insignificant unless the
10804 #[inline(never)] attribute is placed it.
10805 * The #[unsafe_destructor] attribute is now behind a feature gate.
10806 * Struct literals are no longer allowed in ambiguous positions such as
10807 if, while, match, and for..in.
10808 * Declaration of lang items and intrinsics are now feature-gated by
10810 * Integral literals no longer default to `int`, and floating point
10811 literals no longer default to `f64`. Literals must be suffixed with an
10812 appropriate type if inference cannot determine the type of the
10814 * The Box<T> type is no longer implicitly borrowed to &mut T.
10815 * Procedures are now required to not capture borrowed references.
10818 * The standard library is now a "facade" over a number of underlying
10819 libraries. This means that development on the standard library should
10820 be speedier due to smaller crates, as well as a clearer line between
10822 * A new library, libcore, lives under the standard library's facade
10823 which is Rust's "0-assumption" library, suitable for embedded and
10824 kernel development for example.
10825 * A regex crate has been added to the standard distribution. This crate
10826 includes statically compiled regular expressions.
10827 * The unwrap/unwrap_err methods on Result require a Show bound for
10828 better error messages.
10829 * The return types of the std::comm primitives have been centralized
10830 around the Result type.
10831 * A number of I/O primitives have gained the ability to time out their
10833 * A number of I/O primitives have gained the ability to close their
10834 reading/writing halves to cancel pending operations.
10835 * Reverse iterator methods have been removed in favor of `rev()` on
10836 their forward-iteration counterparts.
10837 * A bitflags! macro has been added to enable easy interop with C and
10838 management of bit flags.
10839 * A debug_assert! macro is now provided which is disabled when
10840 `--cfg ndebug` is passed to the compiler.
10841 * A graphviz crate has been added for creating .dot files.
10842 * The std::cast module has been migrated into std::mem.
10843 * The std::local_data api has been migrated from freestanding functions
10844 to being based on methods.
10845 * The Pod trait has been renamed to Copy.
10846 * jemalloc has been added as the default allocator for types.
10847 * The API for allocating memory has been changed to use proper alignment
10848 and sized deallocation
10849 * Connecting a TcpStream or binding a TcpListener is now based on a
10850 string address and a u16 port. This allows connecting to a hostname as
10852 * The Reader trait now contains a core method, read_at_least(), which
10853 correctly handles many repeated 0-length reads.
10854 * The process-spawning API is now centered around a builder-style
10856 * The :? printing qualifier has been moved from the standard library to
10857 an external libdebug crate.
10858 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10859 have been renamed to Eq/Ord.
10860 * The select/plural methods have been removed from format!. The escapes
10861 for { and } have also changed from \{ and \} to {{ and }},
10863 * The TaskBuilder API has been re-worked to be a true builder, and
10864 extension traits for spawning native/green tasks have been added.
10867 * All breaking changes to the language or libraries now have their
10868 commit message annotated with `[breaking-change]` to allow for easy
10869 discovery of breaking changes.
10870 * The compiler will now try to suggest how to annotate lifetimes if a
10871 lifetime-related error occurs.
10872 * Debug info continues to be improved greatly with general bug fixes and
10873 better support for situations like link time optimization (LTO).
10874 * Usage of syntax extensions when cross-compiling has been fixed.
10875 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10876 -fdata-sections and --gc-sections has been enabled by default
10877 * The compiler is now stricter about where it will load module files
10878 from when a module is declared via `mod foo;`.
10879 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10880 Syntax extensions are now discovered via a "plugin registrar" type
10881 which will be extended in the future to other various plugins.
10882 * Lints have been restructured to allow for dynamically loadable lints.
10883 * A number of rustdoc improvements:
10884 * The HTML output has been visually redesigned.
10885 * Markdown is now powered by hoedown instead of sundown.
10886 * Searching heuristics have been greatly improved.
10887 * The search index has been reduced in size by a great amount.
10888 * Cross-crate documentation via `pub use` has been greatly improved.
10889 * Primitive types are now hyperlinked and documented.
10890 * Documentation has been moved from static.rust-lang.org/doc to
10892 * A new sandbox, play.rust-lang.org, is available for running and
10893 sharing rust code examples on-line.
10894 * Unused attributes are now more robustly warned about.
10895 * The dead_code lint now warns about unused struct fields.
10896 * Cross-compiling to iOS is now supported.
10897 * Cross-compiling to mipsel is now supported.
10898 * Stability attributes are now inherited by default and no longer apply
10899 to intra-crate usage, only inter-crate usage.
10900 * Error message related to non-exhaustive match expressions have been
10904 Version 0.10 (2014-04-03)
10905 =========================
10907 * ~1500 changes, numerous bugfixes
10910 * A new RFC process is now in place for modifying the language.
10911 * Patterns with `@`-pointers have been removed from the language.
10912 * Patterns with unique vectors (`~[T]`) have been removed from the
10914 * Patterns with unique strings (`~str`) have been removed from the
10916 * `@str` has been removed from the language.
10917 * `@[T]` has been removed from the language.
10918 * `@self` has been removed from the language.
10919 * `@Trait` has been removed from the language.
10920 * Headers on `~` allocations which contain `@` boxes inside the type for
10921 reference counting have been removed.
10922 * The semantics around the lifetimes of temporary expressions have changed,
10923 see #3511 and #11585 for more information.
10924 * Cross-crate syntax extensions are now possible, but feature gated. See
10925 #11151 for more information. This includes both `macro_rules!` macros as
10926 well as syntax extensions such as `format!`.
10927 * New lint modes have been added, and older ones have been turned on to be
10929 * Unnecessary parentheses
10930 * Uppercase statics
10932 * Uppercase variables
10933 * Publicly visible private types
10934 * `#[deriving]` with raw pointers
10935 * Unsafe functions can no longer be coerced to closures.
10936 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10937 * The `#[simd]` attribute is now behind a feature gate.
10938 * Visibility is no longer allowed on `extern crate` statements, and
10939 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10940 * Trailing commas are now allowed in argument lists and tuple patterns.
10941 * The `do` keyword has been removed, it is now a reserved keyword.
10942 * Default type parameters have been implemented, but are feature gated.
10943 * Borrowed variables through captures in closures are now considered soundly.
10944 * `extern mod` is now `extern crate`
10945 * The `Freeze` trait has been removed.
10946 * The `Share` trait has been added for types that can be shared among
10948 * Labels in macros are now hygienic.
10949 * Expression/statement macro invocations can be delimited with `{}` now.
10950 * Treatment of types allowed in `static mut` locations has been tweaked.
10951 * The `*` and `.` operators are now overloadable through the `Deref` and
10953 * `~Trait` and `proc` no longer have `Send` bounds by default.
10954 * Partial type hints are now supported with the `_` type marker.
10955 * An `Unsafe` type was introduced for interior mutability. It is now
10956 considered undefined to transmute from `&T` to `&mut T` without using the
10958 * The #[linkage] attribute was implemented for extern statics/functions.
10959 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10960 * `Pod` was renamed to `Copy`.
10963 * The `libextra` library has been removed. It has now been decomposed into
10964 component libraries with smaller and more focused nuggets of
10965 functionality. The full list of libraries can be found on the
10966 documentation index page.
10967 * std: `std::condition` has been removed. All I/O errors are now propagated
10968 through the `Result` type. In order to assist with error handling, a
10969 `try!` macro for unwrapping errors with an early return and a lint for
10970 unused results has been added. See #12039 for more information.
10971 * std: The `vec` module has been renamed to `slice`.
10972 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10973 This will become the only growable vector in the future.
10974 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10975 are now found at `std::io::BufferedReader` instead of
10976 `std::io::buffered::BufferedReader`.
10977 * std: `print` and `println` are no longer in the prelude, the `print!` and
10978 `println!` macros are intended to be used instead.
10979 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10980 attempts to statically prevent cycles.
10981 * std: The standard distribution is adopting the policy of pushing failure
10982 to the user rather than failing in libraries. Many functions (such as
10983 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10984 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10985 deriving mode: `#[deriving(Show)]`.
10986 * std: `ToStr` is now implemented for all types implementing `Show`.
10987 * std: The formatting trait methods now take `&self` instead of `&T`
10988 * std: The `invert()` method on iterators has been renamed to `rev()`
10989 * std: `std::num` has seen a reduction in the genericity of its traits,
10990 consolidating functionality into a few core traits.
10991 * std: Backtraces are now printed on task failure if the environment
10992 variable `RUST_BACKTRACE` is present.
10993 * std: Naming conventions for iterators have been standardized. More details
10994 can be found on the wiki's style guide.
10995 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10996 still implement the function.
10997 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10998 * std: `assert_approx_eq!` has been removed
10999 * std: The `e` and `E` formatting specifiers for floats have been added to
11000 print them in exponential notation.
11001 * std: The `Times` trait has been removed
11002 * std: Indications of variance and opting out of builtin bounds is done
11003 through marker types in `std::kinds::marker` now
11004 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11005 `#[deriving(Hash)]` is now possible.
11006 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11007 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11008 * std: `Chan::new` is now `channel()`.
11009 * std: A new synchronous channel type has been implemented.
11010 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11011 * std: `hashmap` and `trie` have been moved to `libcollections`
11012 * std: `run` has been rolled into `io::process`
11013 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11014 * std: The equality and comparison traits have seen some reorganization.
11015 * std: `rand` has moved to `librand`.
11016 * std: `to_{lower,upper}case` has been implemented for `char`.
11017 * std: Logging has been moved to `liblog`.
11018 * collections: `HashMap` has been rewritten for higher performance and less
11020 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11021 it can be booted manually. The runtime guide has more information and
11023 * native: All I/O functionality except signals has been implemented.
11024 * green: Task spawning with `libgreen` has been optimized with stack caching
11025 and various trimming of code.
11026 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11027 * sync: The `extra::sync` module has been updated to modern rust (and moved
11028 to the `sync` library), tweaking and improving various interfaces while
11029 dropping redundant functionality.
11030 * sync: A new `Barrier` type has been added to the `sync` library.
11031 * sync: An efficient mutex for native and green tasks has been implemented.
11032 * serialize: The `base64` module has seen some improvement. It treats
11033 newlines better, has non-string error values, and has seen general
11035 * fourcc: A `fourcc!` macro was introduced
11036 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11037 hexadecimal literal.
11040 * `rustpkg` has been deprecated and removed from the main repository. Its
11041 replacement, `cargo`, is under development.
11042 * Nightly builds of rust are now available
11043 * The memory usage of rustc has been improved many times throughout this
11045 * The build process supports disabling rpath support for the rustc binary
11047 * Code generation has improved in some cases, giving more information to the
11048 LLVM optimization passes to enable more extensive optimizations.
11049 * Debuginfo compatibility with lldb on OSX has been restored.
11050 * The master branch is now gated on an android bot, making building for
11051 android much more reliable.
11052 * Output flags have been centralized into one `--emit` flag.
11053 * Crate type flags have been centralized into one `--crate-type` flag.
11054 * Codegen flags have been consolidated behind a `-C` flag.
11055 * Linking against outdated crates now has improved error messages.
11056 * Error messages with lifetimes will often suggest how to annotate the
11057 function to fix the error.
11058 * Many more types are documented in the standard library, and new guides
11060 * Many `rustdoc` improvements:
11061 * code blocks are syntax highlighted.
11062 * render standalone markdown files.
11063 * the --test flag tests all code blocks by default.
11064 * exported macros are displayed.
11065 * re-exported types have their documentation inlined at the location of the
11067 * search works across crates that have been rendered to the same output
11071 Version 0.9 (2014-01-09)
11072 ==========================
11074 * ~1800 changes, numerous bugfixes
11077 * The `float` type has been removed. Use `f32` or `f64` instead.
11078 * A new facility for enabling experimental features (feature gating) has
11079 been added, using the crate-level `#[feature(foo)]` attribute.
11080 * Managed boxes (@) are now behind a feature gate
11081 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11082 standard library's `Gc` or `Rc` types instead.
11083 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11084 * Jumping back to the top of a loop is now done with `continue` instead of
11086 * Strings can no longer be mutated through index assignment.
11087 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11088 hash delimiters, as in `r###"foo"###`.
11089 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11091 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11092 * `@fn`s have been removed.
11093 * `do` only works with procs in order to make it obvious what the cost
11095 * Single-element tuple-like structs can no longer be dereferenced to
11096 obtain the inner value. A more comprehensive solution for overloading
11097 the dereference operator will be provided in the future.
11098 * The `#[link(...)]` attribute has been replaced with
11099 `#[crate_id = "name#vers"]`.
11100 * Empty `impl`s must be terminated with empty braces and may not be
11101 terminated with a semicolon.
11102 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11103 no longer has any special meaning.
11104 * The old `fmt!` string formatting macro has been removed.
11105 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11106 `print!` and `println!`.
11107 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11108 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11109 `extern mod foo = "bar"` instead.
11110 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11111 * Macros can have attributes.
11112 * Macros can expand to items with attributes.
11113 * Macros can expand to multiple items.
11114 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11115 * Comments may be nested.
11116 * Values automatically coerce to trait objects they implement, without
11118 * Enum discriminants are no longer an entire word but as small as needed to
11119 contain all the variants. The `repr` attribute can be used to override
11120 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11121 `#[repr(C)]` to match C enums.
11122 * Non-string literals are not allowed in attributes (they never worked).
11123 * The FFI now supports variadic functions.
11124 * Octal numeric literals, as in `0o7777`.
11125 * The `concat!` syntax extension performs compile-time string concatenation.
11126 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11127 removed as Rust no longer uses segmented stacks.
11128 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11129 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11130 not `*`; ignoring remaining fields of a struct is also done with `..`,
11131 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11132 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11133 * `rustc` supports the "system" calling convention, which defaults to the
11134 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11136 * The `type_overflow` lint (default: warn) checks literals for overflow.
11137 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11138 * The `attribute_usage` lint (default: warn) warns about unknown
11140 * The `unknown_features` lint (default: warn) warns about unknown
11142 * The `dead_code` lint (default: warn) checks for dead code.
11143 * Rust libraries can be linked statically to one another
11144 * `#[link_args]` is behind the `link_args` feature gate.
11145 * Native libraries are now linked with `#[link(name = "foo")]`
11146 * Native libraries can be statically linked to a rust crate
11147 (`#[link(name = "foo", kind = "static")]`).
11148 * Native OS X frameworks are now officially supported
11149 (`#[link(name = "foo", kind = "framework")]`).
11150 * The `#[thread_local]` attribute creates thread-local (not task-local)
11151 variables. Currently behind the `thread_local` feature gate.
11152 * The `return` keyword may be used in closures.
11153 * Types that can be copied via a memcpy implement the `Pod` kind.
11154 * The `cfg` attribute can now be used on struct fields and enum variants.
11157 * std: The `option` and `result` API's have been overhauled to make them
11158 simpler, more consistent, and more composable.
11159 * std: The entire `std::io` module has been replaced with one that is
11160 more comprehensive and that properly interfaces with the underlying
11161 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11163 * std: `io::util` contains a number of useful implementations of
11164 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11165 `ZeroReader`, `TeeReader`.
11166 * std: The reference counted pointer type `extra::rc` moved into std.
11167 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11168 just a wrapper around it).
11169 * std: The `Either` type has been removed.
11170 * std: `fmt::Default` can be implemented for any type to provide default
11171 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11172 * std: The `rand` API continues to be tweaked.
11173 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11174 on failure in gdb, is now named `rust_fail`.
11175 * std: The `each_key` and `each_value` methods on `HashMap` have been
11176 replaced by the `keys` and `values` iterators.
11177 * std: Functions dealing with type size and alignment have moved from the
11178 `sys` module to the `mem` module.
11179 * std: The `path` module was written and API changed.
11180 * std: `str::from_utf8` has been changed to cast instead of allocate.
11181 * std: `starts_with` and `ends_with` methods added to vectors via the
11182 `ImmutableEqVector` trait, which is in the prelude.
11183 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11184 if the index is out of bounds.
11185 * std: Task failure no longer propagates between tasks, as the model was
11186 complex, expensive, and incompatible with thread-based tasks.
11187 * std: The `Any` type can be used for dynamic typing.
11188 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11190 * std: Methods that produce iterators generally do not have an `_iter`
11192 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11193 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11194 * std: `util::ignore` renamed to `prelude::drop`.
11195 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11197 * std: `vec::raw` has seen a lot of cleanup and API changes.
11198 * std: The standard library no longer includes any C++ code, and very
11199 minimal C, eliminating the dependency on libstdc++.
11200 * std: Runtime scheduling and I/O functionality has been factored out into
11201 extensible interfaces and is now implemented by two different crates:
11202 libnative, for native threading and I/O; and libgreen, for green threading
11203 and I/O. This paves the way for using the standard library in more limited
11204 embedded environments.
11205 * std: The `comm` module has been rewritten to be much faster, have a
11206 simpler, more consistent API, and to work for both native and green
11208 * std: All libuv dependencies have been moved into the rustuv crate.
11209 * native: New implementations of runtime scheduling on top of OS threads.
11210 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11212 * green: The green thread scheduler and message passing types are almost
11213 entirely lock-free.
11214 * extra: The `flatpipes` module had bitrotted and was removed.
11215 * extra: All crypto functions have been removed and Rust now has a policy of
11216 not reimplementing crypto in the standard library. In the future crypto
11217 will be provided by external crates with bindings to established libraries.
11218 * extra: `c_vec` has been modernized.
11219 * extra: The `sort` module has been removed. Use the `sort` method on
11223 * The `rust` and `rusti` commands have been removed, due to lack of
11225 * `rustdoc` was completely rewritten.
11226 * `rustdoc` can test code examples in documentation.
11227 * `rustpkg` can test packages with the argument, 'test'.
11228 * `rustpkg` supports arbitrary dependencies, including C libraries.
11229 * `rustc`'s support for generating debug info is improved again.
11230 * `rustc` has better error reporting for unbalanced delimiters.
11231 * `rustc`'s JIT support was removed due to bitrot.
11232 * Executables and static libraries can be built with LTO (-Z lto)
11233 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11237 Version 0.8 (2013-09-26)
11238 ============================
11240 * ~2200 changes, numerous bugfixes
11243 * The `for` loop syntax has changed to work with the `Iterator` trait.
11244 * At long last, unwinding works on Windows.
11245 * Default methods are ready for use.
11246 * Many trait inheritance bugs fixed.
11247 * Owned and borrowed trait objects work more reliably.
11248 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11249 * rustc can omit emission of code for the `debug!` macro if it is passed
11251 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11252 for foo.rs, then foo/mod.rs, and will generate an error when both are
11254 * Strings no longer contain trailing nulls. The new `std::c_str` module
11255 provides new mechanisms for converting to C strings.
11256 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11257 * The FFI has been overhauled such that foreign functions are called directly,
11258 instead of through a stack-switching wrapper.
11259 * Calling a foreign function must be done through a Rust function with the
11260 `#[fixed_stack_segment]` attribute.
11261 * The `externfn!` macro can be used to declare both a foreign function and
11262 a `#[fixed_stack_segment]` wrapper at once.
11263 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11264 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11265 * `priv` is disallowed everywhere except for struct fields and enum variants.
11266 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11267 * `ref` bindings in irrefutable patterns work correctly now.
11268 * `char` is now prevented from containing invalid code points.
11269 * Casting to `bool` is no longer allowed.
11270 * `\0` is now accepted as an escape in chars and strings.
11271 * `yield` is a reserved keyword.
11272 * `typeof` is a reserved keyword.
11273 * Crates may be imported by URL with `extern mod foo = "url";`.
11274 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11275 * Static vectors can be initialized with repeating elements,
11276 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11277 * Static structs can be initialized with functional record update,
11278 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11279 * `cfg!` can be used to conditionally execute code based on the crate
11280 configuration, similarly to `#[cfg(...)]`.
11281 * The `unnecessary_qualification` lint detects unneeded module
11282 prefixes (default: allow).
11283 * Arithmetic operations have been implemented on the SIMD types in
11284 `std::unstable::simd`.
11285 * Exchange allocation headers were removed, reducing memory usage.
11286 * `format!` implements a completely new, extensible, and higher-performance
11287 string formatting system. It will replace `fmt!`.
11288 * `print!` and `println!` write formatted strings (using the `format!`
11289 extension) to stdout.
11290 * `write!` and `writeln!` write formatted strings (using the `format!`
11291 extension) to the new Writers in `std::rt::io`.
11292 * The library section in which a function or static is placed may
11293 be specified with `#[link_section = "..."]`.
11294 * The `proto!` syntax extension for defining bounded message protocols
11296 * `macro_rules!` is hygienic for `let` declarations.
11297 * The `#[export_name]` attribute specifies the name of a symbol.
11298 * `unreachable!` can be used to indicate unreachable code, and fails
11302 * std: Transitioned to the new runtime, written in Rust.
11303 * std: Added an experimental I/O library, `rt::io`, based on the new
11305 * std: A new generic `range` function was added to the prelude, replacing
11306 `uint::range` and friends.
11307 * std: `range_rev` no longer exists. Since range is an iterator it can be
11308 reversed with `range(lo, hi).invert()`.
11309 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11310 renamed to `unwrap_or`.
11311 * std: The `iterator` module was renamed to `iter`.
11312 * std: Integral types now support the `checked_add`, `checked_sub`, and
11313 `checked_mul` operations for detecting overflow.
11314 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11316 * std: Methods are standardizing on conventions for casting methods:
11317 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11319 * std: The `CString` type in `c_str` provides new ways to convert to and
11321 * std: `DoubleEndedIterator` can yield elements in two directions.
11322 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11324 * std: `str::from_bytes` renamed to `str::from_utf8`.
11325 * std: `pop_opt` and `shift_opt` methods added to vectors.
11326 * std: The task-local data interface no longer uses @, and keys are
11327 no longer function pointers.
11328 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11329 * std: Added `SharedPort` to `comm`.
11330 * std: `Eq` has a default method for `ne`; only `eq` is required
11331 in implementations.
11332 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11333 is required in implementations.
11334 * std: `is_utf8` performance is improved, impacting many string functions.
11335 * std: `os::MemoryMap` provides cross-platform mmap.
11336 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11337 are not 'in-bounds' are considered undefined.
11338 * std: Many freestanding functions in `vec` removed in favor of methods.
11339 * std: Many freestanding functions on scalar types removed in favor of
11341 * std: Many options to task builders were removed since they don't make
11342 sense in the new scheduler design.
11343 * std: More containers implement `FromIterator` so can be created by the
11345 * std: More complete atomic types in `unstable::atomics`.
11346 * std: `comm::PortSet` removed.
11347 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11348 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11349 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11350 default implementations.
11351 * std: Various `from_str` functions were removed in favor of a generic
11352 `from_str` which is available in the prelude.
11353 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11354 * extra: `dlist`, the doubly-linked list was modernized.
11355 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11356 * extra: Added `glob` module, replacing `std::os::glob`.
11357 * extra: `rope` was removed.
11358 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11359 * extra: `net`, and `timer` were removed. The experimental replacements
11360 are `std::rt::io::net` and `std::rt::io::timer`.
11361 * extra: Iterators implemented for `SmallIntMap`.
11362 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11363 * extra: `SmallIntSet` removed. Use `BitvSet`.
11364 * extra: Performance of JSON parsing greatly improved.
11365 * extra: `semver` updated to SemVer 2.0.0.
11366 * extra: `term` handles more terminals correctly.
11367 * extra: `dbg` module removed.
11368 * extra: `par` module removed.
11369 * extra: `future` was cleaned up, with some method renames.
11370 * extra: Most free functions in `getopts` were converted to methods.
11373 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11374 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11375 similarly to gcc's `--march` flag.
11376 * rustc's performance compiling small crates is much better.
11377 * rustpkg has received many improvements.
11378 * rustpkg supports git tags as package IDs.
11379 * rustpkg builds into target-specific directories so it can be used for
11381 * The number of concurrent test tasks is controlled by the environment
11382 variable RUST_TEST_TASKS.
11383 * The test harness can now report metrics for benchmarks.
11384 * All tools have man pages.
11385 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11386 * The runtime uses jemalloc for allocations.
11387 * Segmented stacks are temporarily disabled as part of the transition to
11388 the new runtime. Stack overflows are possible!
11389 * A new documentation backend, rustdoc_ng, is available for use. It is
11390 still invoked through the normal `rustdoc` command.
11393 Version 0.7 (2013-07-03)
11394 =======================
11396 * ~2000 changes, numerous bugfixes
11399 * `impl`s no longer accept a visibility qualifier. Put them on methods
11401 * The borrow checker has been rewritten with flow-sensitivity, fixing
11402 many bugs and inconveniences.
11403 * The `self` parameter no longer implicitly means `&'self self`,
11404 and can be explicitly marked with a lifetime.
11405 * Overloadable compound operators (`+=`, etc.) have been temporarily
11406 removed due to bugs.
11407 * The `for` loop protocol now requires `for`-iterators to return `bool`
11408 so they compose better.
11409 * The `Durable` trait is replaced with the `'static` bounds.
11410 * Trait default methods work more often.
11411 * Structs with the `#[packed]` attribute have byte alignment and
11412 no padding between fields.
11413 * Type parameters bound by `Copy` must now be copied explicitly with
11414 the `copy` keyword.
11415 * It is now illegal to move out of a dereferenced unsafe pointer.
11416 * `Option<~T>` is now represented as a nullable pointer.
11417 * `@mut` does dynamic borrow checks correctly.
11418 * The `main` function is only detected at the topmost level of the crate.
11419 The `#[main]` attribute is still valid anywhere.
11420 * Struct fields may no longer be mutable. Use inherited mutability.
11421 * The `#[no_send]` attribute makes a type that would otherwise be
11423 * The `#[no_freeze]` attribute makes a type that would otherwise be
11425 * Unbounded recursion will abort the process after reaching the limit
11426 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11427 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11428 are never implicitly copyable.
11429 * `#[static_assert]` makes compile-time assertions about static bools.
11430 * At long last, 'argument modes' no longer exist.
11431 * The rarely used `use mod` statement no longer exists.
11433 * Syntax extensions
11434 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11436 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11437 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11438 `#[deriving(...)]`.
11439 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11440 and unsuffixed integer literals.
11443 * The `core` crate was renamed to `std`.
11444 * The `std` crate was renamed to `extra`.
11445 * More and improved documentation.
11446 * std: `iterator` module for external iterator objects.
11447 * Many old-style (internal, higher-order function) iterators replaced by
11448 implementations of `Iterator`.
11449 * std: Many old internal vector and string iterators,
11450 incl. `any`, `all`. removed.
11451 * std: The `finalize` method of `Drop` renamed to `drop`.
11452 * std: The `drop` method now takes `&mut self` instead of `&self`.
11453 * std: The prelude no longer re-exports any modules, only types and traits.
11454 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11455 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11456 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11457 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11458 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11459 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11460 * std: Many types implement `Clone`.
11461 * std: `path` type renamed to `Path`.
11462 * std: `mut` module and `Mut` type removed.
11463 * std: Many standalone functions removed in favor of methods and iterators
11464 in `vec`, `str`. In the future methods will also work as functions.
11465 * std: `reinterpret_cast` removed. Use `transmute`.
11466 * std: ascii string handling in `std::ascii`.
11467 * std: `Rand` is implemented for ~/@.
11468 * std: `run` module for spawning processes overhauled.
11469 * std: Various atomic types added to `unstable::atomic`.
11470 * std: Various types implement `Zero`.
11471 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11472 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11473 * std: Added `os::mkdir_recursive`.
11474 * std: Added `os::glob` function performs filesystems globs.
11475 * std: `FuzzyEq` renamed to `ApproxEq`.
11476 * std: `Map` now defines `pop` and `swap` methods.
11477 * std: `Cell` constructors converted to static methods.
11478 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11479 * extra: `flate` module moved from `std` to `extra`.
11480 * extra: `fileinput` module for iterating over a series of files.
11481 * extra: `Complex` number type and `complex` module.
11482 * extra: `Rational` number type and `rational` module.
11483 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11484 * extra: `term` uses terminfo now, is more correct.
11485 * extra: `arc` functions converted to methods.
11486 * extra: Implementation of fixed output size variations of SHA-2.
11489 * `unused_variables` lint mode for unused variables (default: warn).
11490 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11492 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11494 * `dead_assignment` lint mode for unread variables (default: warn).
11495 * `unnecessary_allocation` lint mode detects some heap allocations that are
11496 immediately borrowed so could be written without allocating (default: warn).
11497 * `missing_doc` lint mode (default: allow).
11498 * `unreachable_code` lint mode (default: warn).
11499 * The `rusti` command has been rewritten and a number of bugs addressed.
11500 * rustc outputs in color on more terminals.
11501 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11502 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11503 * Compiling with `-g` will make the binary record information about
11504 dynamic borrowcheck failures for debugging.
11505 * rustdoc has a nicer stylesheet.
11506 * Various improvements to rustdoc.
11507 * Improvements to rustpkg (see the detailed release notes).
11510 Version 0.6 (2013-04-03)
11511 ========================
11513 * ~2100 changes, numerous bugfixes
11516 * The self type parameter in traits is now spelled `Self`
11517 * The `self` parameter in trait and impl methods must now be explicitly
11518 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11519 * Static methods no longer require the `static` keyword and instead
11520 are distinguished by the lack of a `self` parameter
11521 * Replaced the `Durable` trait with the `'static` lifetime
11522 * The old closure type syntax with the trailing sigil has been
11523 removed in favor of the more consistent leading sigil
11524 * `super` is a keyword, and may be prefixed to paths
11525 * Trait bounds are separated with `+` instead of whitespace
11526 * Traits are implemented with `impl Trait for Type`
11527 instead of `impl Type: Trait`
11528 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11529 * The `export` keyword has finally been removed
11530 * The `move` keyword has been removed (see "Semantic changes")
11531 * The interior mutability qualifier on vectors, `[mut T]`, has been
11532 removed. Use `&mut [T]`, etc.
11533 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11534 * `fail` is no longer a keyword. Use `fail!()`
11535 * `assert` is no longer a keyword. Use `assert!()`
11536 * `log` is no longer a keyword. use `debug!`, etc.
11537 * 1-tuples may be represented as `(T,)`
11538 * Struct fields may no longer be `mut`. Use inherited mutability,
11539 `@mut T`, `core::mut` or `core::cell`
11540 * `extern mod { ... }` is no longer valid syntax for foreign
11541 function modules. Use extern blocks: `extern { ... }`
11542 * Newtype enums removed. Use tuple-structs.
11543 * Trait implementations no longer support visibility modifiers
11544 * Pattern matching over vectors improved and expanded
11545 * `const` renamed to `static` to correspond to lifetime name,
11546 and make room for future `static mut` unsafe mutable globals.
11547 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11548 * `Clone` implementations can be automatically generated with
11549 `#[deriving(Clone)]`
11550 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11551 instead of `foo as Bar`.
11552 * Fixed length vector types are now written as `[int, .. 3]`
11553 instead of `[int * 3]`.
11554 * Fixed length vector types can express the length as a constant
11555 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11558 * Types with owned pointers or custom destructors move by default,
11559 eliminating the `move` keyword
11560 * All foreign functions are considered unsafe
11561 * &mut is now unaliasable
11562 * Writes to borrowed @mut pointers are prevented dynamically
11564 * The name of the main function can be customized using #[main]
11565 * The default type of an inferred closure is &fn instead of @fn
11566 * `use` statements may no longer be "chained" - they cannot import
11567 identifiers imported by previous `use` statements
11568 * `use` statements are crate relative, importing from the "top"
11569 of the crate by default. Paths may be prefixed with `super::`
11570 or `self::` to change the search behavior.
11571 * Method visibility is inherited from the implementation declaration
11572 * Structural records have been removed
11573 * Many more types can be used in static items, including enums
11574 'static-lifetime pointers and vectors
11575 * Pattern matching over vectors improved and expanded
11576 * Typechecking of closure types has been overhauled to
11577 improve inference and eliminate unsoundness
11578 * Macros leave scope at the end of modules, unless that module is
11579 tagged with #[macro_escape]
11582 * Added big integers to `std::bigint`
11583 * Removed `core::oldcomm` module
11584 * Added pipe-based `core::comm` module
11585 * Numeric traits have been reorganized under `core::num`
11586 * `vec::slice` finally returns a slice
11587 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11588 * Containers reorganized around traits in `core::container`
11589 * `core::dvec` removed, `~[T]` is a drop-in replacement
11590 * `core::send_map` renamed to `core::hashmap`
11591 * `std::map` removed; replaced with `core::hashmap`
11592 * `std::treemap` reimplemented as an owned balanced tree
11593 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11594 * `core::trie` added as a fast ordered map for integer keys
11595 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11596 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11597 overload the comparison operators, whereas `TotalOrd` is used
11598 by certain container types
11601 * Replaced the 'cargo' package manager with 'rustpkg'
11602 * Added all-purpose 'rust' tool
11603 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11604 * rustc now *attempts* to offer spelling suggestions
11605 * Improved support for ARM and Android
11606 * Preliminary MIPS backend
11607 * Improved foreign function ABI implementation for x86, x86_64
11608 * Various memory usage improvements
11609 * Rust code may be embedded in foreign code under limited circumstances
11610 * Inline assembler supported by new asm!() syntax extension.
11613 Version 0.5 (2012-12-21)
11614 ===========================
11616 * ~900 changes, numerous bugfixes
11619 * Removed `<-` move operator
11620 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11621 * Removed old fixed length vector syntax - `[T]/N`
11622 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11623 * Macros may now expand to items and statements
11624 * `a.b()` is always parsed as a method call, never as a field projection
11625 * `Eq` and `IterBytes` implementations can be automatically generated
11626 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11627 * Removed the special crate language for `.rc` files
11628 * Function arguments may consist of any irrefutable pattern
11631 * `&` and `~` pointers may point to objects
11632 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11633 * Enum variants may be structs
11634 * Destructors can be added to all nominal types with the Drop trait
11635 * Structs and nullary enum variants may be constants
11636 * Values that cannot be implicitly copied are now automatically moved
11637 without writing `move` explicitly
11638 * `&T` may now be coerced to `*T`
11639 * Coercions happen in `let` statements as well as function calls
11640 * `use` statements now take crate-relative paths
11641 * The module and type namespaces have been merged so that static
11642 method names can be resolved under the trait in which they are
11645 * Improved support for language features
11646 * Trait inheritance works in many scenarios
11647 * More support for explicit self arguments in methods - `self`, `&self`
11648 `@self`, and `~self` all generally work as expected
11649 * Static methods work in more situations
11650 * Experimental: Traits may declare default methods for the implementations
11654 * New condition handling system in `core::condition`
11655 * Timsort added to `std::sort`
11656 * New priority queue, `std::priority_queue`
11657 * Pipes for serializable types, `std::flatpipes'
11658 * Serialization overhauled to be trait-based
11659 * Expanded `getopts` definitions
11660 * Moved futures to `std`
11661 * More functions are pure now
11662 * `core::comm` renamed to `oldcomm`. Still deprecated
11663 * `rustdoc` and `cargo` are libraries now
11666 * Added a preliminary REPL, `rusti`
11667 * License changed from MIT to dual MIT/APL2
11670 Version 0.4 (2012-10-15)
11671 ==========================
11673 * ~2000 changes, numerous bugfixes
11676 * All keywords are now strict and may not be used as identifiers anywhere
11677 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11678 'of', 'with', 'to', 'class'.
11679 * Classes are replaced with simpler structs
11680 * Explicit method self types
11681 * `ret` became `return` and `alt` became `match`
11682 * `import` is now `use`; `use is now `extern mod`
11683 * `extern mod { ... }` is now `extern { ... }`
11684 * `use mod` is the recommended way to import modules
11685 * `pub` and `priv` replace deprecated export lists
11686 * The syntax of `match` pattern arms now uses fat arrow (=>)
11687 * `main` no longer accepts an args vector; use `os::args` instead
11690 * Trait implementations are now coherent, ala Haskell typeclasses
11691 * Trait methods may be static
11692 * Argument modes are deprecated
11693 * Borrowed pointers are much more mature and recommended for use
11694 * Strings and vectors in the static region are stored in constant memory
11695 * Typestate was removed
11696 * Resolution rewritten to be more reliable
11697 * Support for 'dual-mode' data structures (freezing and thawing)
11700 * Most binary operators can now be overloaded via the traits in
11702 * `std::net::url` for representing URLs
11703 * Sendable hash maps in `core::send_map`
11704 * `core::task' gained a (currently unsafe) task-local storage API
11707 * An efficient new intertask communication primitive called the pipe,
11708 along with a number of higher-level channel types, in `core::pipes`
11709 * `std::arc`, an atomically reference counted, immutable, shared memory
11711 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11712 * Futures are now based on pipes and sendable
11713 * More robust linked task failure
11714 * Improved task builder API
11717 * Improved error reporting
11718 * Preliminary JIT support
11719 * Preliminary work on precise GC
11720 * Extensive architectural improvements to rustc
11721 * Begun a transition away from buggy C++-based reflection (shape) code to
11722 Rust-based (visitor) code
11723 * All hash functions and tables converted to secure, randomized SipHash
11726 Version 0.3 (2012-07-12)
11727 ========================
11729 * ~1900 changes, numerous bugfixes
11731 * New coding conveniences
11732 * Integer-literal suffix inference
11733 * Per-item control over warnings, errors
11734 * #[cfg(windows)] and #[cfg(unix)] attributes
11735 * Documentation comments
11736 * More compact closure syntax
11737 * 'do' expressions for treating higher-order functions as
11739 * *-patterns (wildcard extended to all constructor fields)
11742 * Name resolution pass and exhaustiveness checker rewritten
11743 * Region pointers and borrow checking supersede alias
11745 * Init-ness checking is now provided by a region-based liveness
11746 pass instead of the typestate pass; same for last-use analysis
11747 * Extensive work on region pointers
11749 * Experimental new language features
11750 * Slices and fixed-size, interior-allocated vectors
11751 * #!-comments for lang versioning, shell execution
11752 * Destructors and iface implementation for classes;
11753 type-parameterized classes and class methods
11754 * 'const' type kind for types that can be used to implement
11755 shared-memory concurrency patterns
11759 * Removal of various obsolete features
11760 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11761 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11763 * Constructs: do-while loops ('do' repurposed), fn binding,
11764 resources (replaced by destructors)
11766 * Compiler reorganization
11767 * Syntax-layer of compiler split into separate crate
11768 * Clang (from LLVM project) integrated into build
11769 * Typechecker split into sub-modules
11772 * New time functions
11773 * Extension methods for many built-in types
11774 * Arc: atomic-refcount read-only / exclusive-use shared cells
11775 * Par: parallel map and search routines
11776 * Extensive work on libuv interface
11777 * Much vector code moved to libraries
11778 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11779 #include, #include_str, #include_bin
11781 * Tool improvements
11782 * Cargo automatically resolves dependencies
11785 Version 0.2 (2012-03-29)
11786 =========================
11788 * >1500 changes, numerous bugfixes
11790 * New docs and doc tooling
11792 * New port: FreeBSD x86_64
11794 * Compilation model enhancements
11795 * Generics now specialized, multiply instantiated
11796 * Functions now inlined across separate crates
11798 * Scheduling, stack and threading fixes
11799 * Noticeably improved message-passing performance
11800 * Explicit schedulers
11804 * Experimental new language features
11805 * Operator overloading
11809 * Various language extensions
11810 * C-callback function types: 'crust fn ...'
11811 * Infinite-loop construct: 'loop { ... }'
11812 * Shorten 'mutable' to 'mut'
11813 * Required mutable-local qualifier: 'let mut ...'
11814 * Basic glob-exporting: 'export foo::*;'
11815 * Alt now exhaustive, 'alt check' for runtime-checked
11816 * Block-function form of 'for' loop, with 'break' and 'ret'.
11819 * AST quasi-quote syntax extension
11820 * Revived libuv interface
11821 * New modules: core::{future, iter}, std::arena
11822 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11823 * Extensive cleanup, regularization in libstd, libcore
11826 Version 0.1 (2012-01-20)
11827 ===============================
11829 * Most language features work, including:
11830 * Unique pointers, unique closures, move semantics
11831 * Interface-constrained generics
11832 * Static interface dispatch
11834 * Multithread task scheduling
11835 * Typestate predicates
11836 * Failure unwinding, destructors
11837 * Pattern matching and destructuring assignment
11838 * Lightweight block-lambda syntax
11839 * Preliminary macro-by-example
11841 * Compiler works with the following configurations:
11842 * Linux: x86 and x86_64 hosts and targets
11843 * macOS: x86 and x86_64 hosts and targets
11844 * Windows: x86 hosts and targets
11846 * Cross compilation / multi-target configuration supported.
11848 * Preliminary API-documentation and package-management tools included.
11852 * Documentation is incomplete.
11854 * Performance is below intended target.
11856 * Standard library APIs are subject to extensive change, reorganization.
11858 * Language-level versioning is not yet operational - future code will
11859 break unexpectedly.